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Regeneron Pharmaceuticals

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FY2023 Annual Report · Regeneron Pharmaceuticals
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ANNUAL REPORT

2023

REGENERON BY THE NUMBERS

12

medicines approved in 
the United States and/or 
other countries

~50

countries with clinical 
trials

13.4K+

Regeneron colleagues 
worldwide at year end

~35

product candidates in  
clinical development

6

genetics medicines 
programs in the clinic

1M+

eligible patients 
received support from 
our patient support 
programs in 2023

23K+

hours of employee 
community service through 
our annual Day for Doing 
Good in 2023

~2.3M

exomes sequenced by
Regeneron Genetics 
Center® since its 
founding

~2.4M

students supported 
by Regeneron STEM 
initiatives since 2020

FORM 10-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K 

(Mark One)
☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2023

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from __________ to __________

Commission File Number: 000-19034

REGENERON PHARMACEUTICALS, INC. 

(Exact name of registrant as specified in its charter)
New York
(State or other jurisdiction of incorporation or organization)

13-3444607
(I.R.S. Employer Identification No.)

777 Old Saw Mill River Road  Tarrytown, New York  10591-6707
(Address of principal executive offices, including zip code)

(914) 847-7000 
(Registrant's telephone number, including area code)
Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock - par value $.001 per share

Trading Symbol Name of each exchange on which registered

REGN

NASDAQ Global Select Market

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Securities registered pursuant to section 12(g) of the Act: None

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities 
Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and 
(2) has been subject to such filing requirements for the past 90 days.

Yes ☒ No ☐

Yes ☐ No ☒

Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to 
Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was 
required to submit such files).

Yes ☒ No ☐

Indicate  by  check  mark  whether  the  registrant  is  a  large  accelerated  filer,  an  accelerated  filer,  a  non-accelerated  filer,  a  smaller  reporting  company,  or  an 
emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" 
in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒ Accelerated filer ☐

Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new 
or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal 
control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that 
prepared or issued its audit report. 

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the 
filing reflect the correction of an error to previously issued financial statements.

☐

☒

☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received 
by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).

☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).

Yes ☐ No ☒

The aggregate market value of the voting and non-voting common stock held by non-affiliates of the registrant was $76.7 billion, computed by reference to 
the closing sales price of the stock on NASDAQ on June 30, 2023, the last trading day of the registrant's most recently completed second fiscal quarter. For 
purposes  of  this  calculation  only,  the  registrant  has  assumed  that  all  of  its  directors  and  executive  officers,  and  no  other  persons,  are  its  affiliates.  This 
determination of affiliate status is not necessarily a determination for other purposes.

The number of shares outstanding of each of the registrant's classes of common stock as of January 25, 2024:

Class of Common Stock
Class A Stock, $.001 par value
Common Stock, $.001 par value

Number of Shares
1,818,146
107,943,750

DOCUMENTS INCORPORATED BY REFERENCE

Specified  portions  of  the  Registrant's  definitive  proxy  statement  to  be  filed  in  connection  with  solicitation  of  proxies  for  its  2024  Annual  Meeting  of 
Shareholders are incorporated by reference into Part III of this Form 10-K. Exhibit index is located on pages 92 to 96 of this filing. 

REGENERON PHARMACEUTICALS, INC.
ANNUAL REPORT ON FORM 10-K
TABLE OF CONTENTS

Page Numbers

PART I
Item 1.

Item 1A.

Item 1B.

Item 1C.

Item 2.

Item 3.

Item 4.

PART II
Item 5.

Item 6.

Item 7.

Item 7A.

Item 8.

Item 9.

Item 9A.

Item 9B.

Item 9C.

PART III
Item 10.

Item 11.

Item 12.

Item 13.

Item 14.

PART IV
Item 15.

Business

Risk Factors

Unresolved Staff Comments

Cybersecurity

Properties

Legal Proceedings

Mine Safety Disclosures

Market for Registrant's Common Equity, Related Stockholder Matters, 
and Issuer Purchases of Equity Securities
[Reserved]

Management's Discussion and Analysis of Financial Condition and 
Results of Operations
Quantitative and Qualitative Disclosures About Market Risk

Financial Statements and Supplementary Data

Changes in and Disagreements with Accountants on Accounting and 
Financial Disclosure
Controls and Procedures

Other Information

Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Directors, Executive Officers and Corporate Governance

Executive Compensation

Security Ownership of Certain Beneficial Owners and Management and 
Related Stockholder Matters
Certain Relationships and Related Transactions, and Director 
Independence
Principal Accountant Fees and Services

Exhibits and Financial Statement Schedules

Item 16.

Form 10-K Summary

SIGNATURE PAGE

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38

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70

71

71

71

72

73

73

89

90

90

90

91
91

91

91

91

91

91

92

96

97

"Altibodies™,"  "ARCALYST®,"  "Evkeeza®,"  "EYLEA®,"  "EYLEA®  HD,"  "Inmazeb®,"  "Libtayo®,"  "Praluent®"  (in  the 
United  States),  "REGEN-COV®,"  "Regeneron®,"  "Regeneron  Genetics  Center®,"  "RGC®,"  "Veloci-Bi®,"  "VelociGene®," 
"VelociHum®," "VelociMab®," "VelocImmune®," "VelociMouse®," "VelociSuite®," "VelociT®," "Veopoz™," and "ZALTRAP®" 
are trademarks of Regeneron Pharmaceuticals, Inc. Trademarks and trade names of other companies appearing in this report 
are,  to  the  knowledge  of  Regeneron  Pharmaceuticals,  Inc.,  the  property  of  their  respective  owners.  This  report  refers  to 
products of Regeneron Pharmaceuticals, Inc., its collaborators, and other parties. Consult the product label in each territory for 
specific information about such products.

Item 1. Business

PART I

This  Annual  Report  on  Form  10-K  contains  forward-looking  statements  that  involve  risks  and  uncertainties  relating  to  future 
events  and  the  future  performance  of  Regeneron  Pharmaceuticals,  Inc.  (where  applicable,  together  with  its  subsidiaries, 
"Regeneron," "Company," "we," "us," and "our"), and actual events or results may differ materially from these forward-looking 
statements. Words such as "anticipate," "expect," "intend," "plan," "believe," "seek," "estimate," variations of such words, and 
similar expressions are intended to identify such forward-looking statements, although not all forward-looking statements contain 
these identifying words. These statements concern, and these risks and uncertainties include, among others: 

•

•
•

•

•

•

•

•

•

•
•

•

•
•
•

•

•
•

the nature, timing, and possible success and therapeutic applications of products marketed or otherwise commercialized 
by Regeneron and/or its collaborators or licensees (collectively, "Regeneron's Products") and product candidates being 
developed  by  Regeneron  and/or  its  collaborators  or  licensees  (collectively,  "Regeneron's  Product  Candidates")  and 
research and clinical programs now underway or planned, including without limitation those discussed or referenced in 
this  report,  Regeneron's  and  its  collaborators'  earlier-stage  programs,  and  the  use  of  human  genetics  in  Regeneron's 
research programs; 
the likelihood and timing of achieving any of our anticipated development milestones referenced in this report; 
safety issues resulting from the administration of Regeneron's Products and Regeneron's Product Candidates in patients, 
including  serious  complications  or  side  effects  in  connection  with  the  use  of  Regeneron's  Products  and  Regeneron's 
Product Candidates in clinical trials; 
the  likelihood,  timing,  and  scope  of  possible  regulatory  approval  and  commercial  launch  of  our  late-stage  product 
candidates and new indications for Regeneron's Products, including without limitation those discussed or referenced in 
this report; 
the extent to which the results from the research and development programs conducted by us and/or our collaborators 
may  be  replicated  in  other  studies  and/or  lead  to  advancement  of  product  candidates  to  clinical  trials,  therapeutic 
applications, or regulatory approval; 
ongoing  regulatory  obligations  and  oversight  impacting  Regeneron's  Products,  research  and  clinical  programs,  and 
business, including those relating to patient privacy; 
determinations  by  regulatory  and  administrative  governmental  authorities  which  may  delay  or  restrict  our  ability  to 
continue to develop or commercialize Regeneron's Products and Regeneron's Product Candidates; 
competing drugs and product candidates that may be superior to, or more cost effective than, Regeneron's Products and 
Regeneron's Product Candidates; 
uncertainty  of  the  utilization,  market  acceptance,  and  commercial  success  of  Regeneron's  Products  and  Regeneron's 
Product  Candidates  and  the  impact  of  studies  (whether  conducted  by  Regeneron  or  others  and  whether  mandated  or 
voluntary) or recommendations and guidelines from governmental authorities and other third parties on the commercial 
success of Regeneron's Products and Regeneron's Product Candidates; 
our ability to manufacture and manage supply chains for multiple products and product candidates; 
the  ability  of  our  collaborators,  suppliers,  or  other  third  parties  (as  applicable)  to  perform  manufacturing,  filling, 
finishing,  packaging,  labeling,  distribution,  and  other  steps  related  to  Regeneron's  Products  and  Regeneron's  Product 
Candidates; 
the availability and extent of reimbursement of Regeneron's Products from third-party payors, including private payor 
healthcare and insurance programs, health maintenance organizations, pharmacy benefit management companies, and 
government programs such as Medicare and Medicaid; 
coverage and reimbursement determinations by such payors and new policies and procedures adopted by such payors;
unanticipated expenses; 
the costs of developing, producing, and selling products; our ability to meet any of our financial projections or guidance, 
including  without  limitation  capital  expenditures,  and  changes  to  the  assumptions  underlying  those  projections  or 
guidance; 
the  potential  for  any  license  or  collaboration  agreement,  including  our  agreements  with  Sanofi  and  Bayer  (or  their 
respective affiliated companies, as applicable), to be cancelled or terminated; 
the impact of public health outbreaks, epidemics, or pandemics (such as the COVID-19 pandemic) on our business; and 
risks  associated  with  intellectual  property  of  other  parties  and  pending  or  future  litigation  relating  thereto  (including 
without limitation the patent litigation and other related proceedings described further in Note 16 to our Consolidated 
Financial  Statements  included  in  this  report),  other  litigation  and  other  proceedings  and  government  investigations 
relating  to  the  Company  and/or  its  operations  (including  without  limitation  those  described  in  Note  16  to  our 
Consolidated  Financial  Statements  included  in  this  report),  the  ultimate  outcome  of  any  such  proceedings  and 
investigations, and the impact any of the foregoing may have on our business, prospects, operating results, and financial 
condition. 

These statements are made based on management's current beliefs and judgment, and the reader is cautioned not to rely on any 
such  statements.  In  evaluating  such  statements,  shareholders  and  potential  investors  should  specifically  consider  the  various 

2

factors  identified  under  Part  I,  Item  1A.  "Risk  Factors,"  which  could  cause  actual  events  and  results  to  differ  materially  from 
those indicated by such forward-looking statements. We do not undertake any obligation to update (publicly or otherwise) any 
forward-looking statement, whether as a result of new information, future events, or otherwise.

General

Regeneron  Pharmaceuticals,  Inc.  is  a  fully  integrated  biotechnology  company  that  invents,  develops,  manufactures,  and 
commercializes medicines for people with serious diseases. Our products and product candidates in development are designed to 
help patients with eye diseases, allergic and inflammatory diseases, cancer, cardiovascular and metabolic diseases, hematologic 
conditions, infectious diseases, and rare diseases. 

Our core business strategy is to maintain a strong foundation in basic scientific research and discovery-enabling technologies, and 
to  build  on  that  foundation  with  our  clinical  development,  manufacturing,  and  commercial  capabilities.  Our  objective  is  to 
continue to advance as an integrated, multi-product biotechnology company that provides patients and medical professionals with 
important medicines for preventing and treating human diseases.

Selected financial information is summarized as follows:

Year Ended December 31,

(In millions, except per share data)

2023

2022

2021

Revenues

Net income

$ 13,117.2  $ 12,172.9  $ 16,071.7 

$  3,953.6  $  4,338.4  $  8,075.3 

Net income per share - diluted

$ 

34.77  $ 

38.22  $ 

71.97 

For purposes of this report, references to our products encompass products marketed or otherwise commercialized by us and/or 
our collaborators or licensees and references to our product candidates encompass product candidates in development by us and/or 
our  collaborators  or  licensees  (in  the  case  of  collaborated  or  licensed  products  or  product  candidates  under  the  terms  of  the 
applicable collaboration or license agreements), unless otherwise stated or required by the context.

Products

Products that have received marketing approval are summarized in the table below. Certain products have also received marketing 
approval in countries outside the United States, European Union ("EU"), or Japan.

Product

EYLEA® HD (aflibercept) Injection 8 
mg(a)

EYLEA® (aflibercept) Injection(a)

Dupixent® (dupilumab) Injection(b)

Disease

Wet age-related macular degeneration 
("wAMD")
Diabetic macular edema ("DME")
Diabetic retinopathy ("DR")
wAMD
DME

DR
Macular edema following retinal vein 
occlusion ("RVO"), which includes 
macular edema following central retinal 
vein occlusion ("CRVO") and macular 
edema following branch retinal vein 
occlusion ("BRVO")

Myopic choroidal neovascularization 
("mCNV")
Neovascular glaucoma ("NVG")

Retinopathy of prematurity ("ROP")

Atopic dermatitis (in adults, adolescents, 
and pediatrics aged 6 months and older)
Asthma (in adults and adolescents)

3

U.S.
a

a
a
a
a

a
a

a

a

a

Territory
EU
a

Japan
a

a

a
a

a

a

a

a

a

a

a
a

a

a

a

a

a

a

Product (continued)

Dupixent (dupilumab) Injection(b) 
(continued)

Disease
Asthma (in pediatrics 6–11 years of age)

U.S.
a

Territory
EU
a

Japan

Libtayo® (cemiplimab) Injection(c)

Praluent® (alirocumab) Injection(d)

REGEN-COV®(e)
Kevzara (sarilumab) Injection(b)

Evkeeza® (evinacumab) Injection(f)

Inmazeb® (atoltivimab, maftivimab, and 
odesivimab) Injection
Veopoz™ (pozelimab) Injection

ARCALYST® (rilonacept) Injection(g)

ZALTRAP® (ziv-aflibercept) Injection for 
Intravenous Infusion(h)

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

Chronic rhinosinusitis with nasal 
polyposis ("CRSwNP")
Eosinophilic esophagitis ("EoE") (in 
adults and adolescents)
EoE (in pediatrics 1–11 years of age)

Prurigo nodularis

Metastatic or locally advanced first-line 
non-small cell lung cancer ("NSCLC")
Metastatic or locally advanced first-line 
NSCLC (in combination with 
chemotherapy)

Metastatic or locally advanced basal cell 
carcinoma ("BCC")
Metastatic or locally advanced cutaneous 
squamous cell carcinoma ("CSCC")
Metastatic or recurrent second-line 
cervical cancer
LDL-lowering in heterozygous familial 
hypercholesterolemia ("HeFH") or 
clinical atherosclerotic cardiovascular 
disease ("ASCVD")

HeFH in pediatrics and adolescents (8–
17 years of age)
Cardiovascular risk reduction in patients 
with established cardiovascular disease
Homozygous familial 
hypercholesterolemia ("HoFH")
COVID-19

Rheumatoid arthritis ("RA")

Polymyalgia rheumatica ("PMR")

HoFH (in adults, adolescents, and 
pediatrics aged 5 years and older)
Infection caused by Zaire ebolavirus 

CD55-deficient protein-losing 
enteropathy ("CHAPLE") (in adults, 
adolescents, and pediatrics aged 1 year 
and older) 

Cryopyrin-associated periodic 
syndromes ("CAPS"), including familial 
cold auto-inflammatory syndrome 
("FCAS") and Muckle-Wells syndrome 
("MWS") (in adults and adolescents)
Deficiency of interleukin-1 receptor 
antagonist ("DIRA") (in adults, 
adolescents, and pediatrics)

Recurrent pericarditis (in adults and 
adolescents)
Metastatic colorectal cancer ("mCRC")

4

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

Note: Refer to table below (net product sales of Regeneron-discovered products) for information regarding whether net product sales 
for a particular product are recorded by us or others. In addition, unless otherwise noted, products in the table above are generally 
approved for use in adults in the above-referenced diseases.
(a) In collaboration with Bayer outside the United States. Aflibercept 8 mg is known as EYLEA HD in the United States and EYLEA 8 
mg in other countries. 
(b) In collaboration with Sanofi
(c) In collaboration with Sanofi prior to July 2022. Effective July 2022, the Company is solely responsible for the development, 
commercialization, and manufacturing of Libtayo. Refer to "Collaboration, License, and Other Agreements" section below for further 
details.
(d) The Company is solely responsible for the development and commercialization of Praluent in the United States and Sanofi is 
responsible for the development and commercialization of Praluent outside the United States.
(e) In collaboration with Roche. Product is known as REGEN-COV in the United States and Ronapreve™ in other countries. 
(f) The Company is solely responsible for the development and commercialization of Evkeeza in the United States and Ultragenyx is 
responsible for the development and commercialization of Evkeeza outside the United States.
(g) Kiniksa is solely responsible for the development and commercialization of ARCALYST.
(h) Sanofi is solely responsible for the development and commercialization of ZALTRAP.

Net product sales of Regeneron-discovered products consist of the following:

(In millions)
EYLEA HD(a)
EYLEA(a)

Total EYLEA HD and 

EYLEA

Dupixent(b)
Libtayo(c)
Praluent(d)
REGEN-COV(e)
Kevzara(b)
Other products(f)

Year Ended December 31,
2022
ROW
$  165.8  $  —  $  165.8  $  —  $  —  $  —  $  —  $  —  $  — 
$ 5,719.6  $ 3,495.2  $ 9,214.8  $ 6,264.6  $ 3,382.8  $ 9,647.4  $ 5,792.3  $ 3,450.9  $ 9,243.2 

2023
ROW(g)

2021
ROW

Total

Total

Total

U.S.

U.S.

U.S.

$ 5,885.4  $ 3,495.2  $ 9,380.6  $ 6,264.6  $ 3,382.8  $ 9,647.4  $ 5,792.3  $ 3,450.9  $ 9,243.2 
$ 8,855.6  $ 2,732.5  $ 11,588.1  $ 6,668.0  $ 2,013.2  $ 8,681.2  $ 4,713.0  $ 1,485.3  $ 6,198.3 

$  538.8  $  330.0  $  868.8  $  374.5  $  203.5  $  578.0  $  306.3  $  151.9  $  458.2 
$  182.4  $  456.5  $  638.9  $  130.0  $  337.4  $  467.4  $  170.0  $  251.1  $  421.1 
$  —  $  618.8  $  618.8  $  —  $ 1,769.6  $ 1,769.6  $ 5,828.0  $ 1,745.9  $ 7,573.9 

$  214.7  $  171.2  $  385.9  $  199.7  $  158.3  $  358.0  $  161.9  $  176.1  $  338.0 

$  150.5  $ 

67.4  $  217.9  $ 

56.1  $ 

69.1  $  125.2  $ 

25.9  $ 

86.4  $  112.3 

(a) Regeneron records net product sales of EYLEA HD and EYLEA in the United States, and Bayer records net product sales outside the United States. 
The Company records its share of profits in connection with sales outside the United States.
(b) Sanofi records global net product sales of Dupixent and Kevzara. The Company records its share of profits in connection with global sales of 
Dupixent and Kevzara.
(c) Prior to July 1, 2022, Regeneron recorded net product sales of Libtayo in the United States and Sanofi recorded net product sales of Libtayo outside 
the United States. The parties equally shared profits/losses in connection with global sales of Libtayo. Effective July 1, 2022, the Company began 
recording net product sales of Libtayo outside the United States and pays Sanofi a royalty on global sales. Refer to "Collaboration, License, and Other 
Agreements" section below for further details. Included in this line item for the years ended December 31, 2023 and 2022 is approximately $6 million 
and $34 million, respectively, of net product sales recorded by Sanofi in connection with sales in certain markets outside the United States (Sanofi 
recorded net product sales in such markets during a transition period until inventory on hand as of July 1, 2022 had been sold through to the end 
customers).
(d) Regeneron records net product sales of Praluent in the United States. Sanofi records net product sales of Praluent outside the United States and pays 
the Company a royalty on such sales.
(e) Regeneron records net product sales of REGEN-COV in the United States and Roche records net product sales of Ronapreve outside the United 
States. The parties share gross profits from global sales of REGEN-COV and Ronapreve based on a pre-specified formula.
(f) Included in this line item are products which are sold by the Company and others. Refer to Part II, Item 7. "Management's Discussion and Analysis 
of Financial Condition and Results of Operations - Results of Operations - Revenues" for a complete listing of net product sales recorded by the 
Company. Not included in this line item are net product sales of ARCALYST subsequent to the first quarter of 2021, which are recorded by Kiniksa.
(g) Rest of world ("ROW")

5

Programs in Clinical Development

Product  candidates  in  clinical  development,  which  are  being  developed  by  us  and/or  our  collaborators,  are  summarized  in  the 
table below. 

There  are  numerous  uncertainties  associated  with  drug  development,  including  uncertainties  related  to  safety  and  efficacy  data 
from  each  phase  of  drug  development  (including  any  post-approval  studies),  uncertainties  related  to  the  enrollment  and 
performance  of  clinical  trials,  changes  in  regulatory  requirements,  changes  to  drug  pricing  and  reimbursement  regulations  and 
requirements, and changes in the competitive landscape affecting a product candidate. The planning, execution, and results of our 
clinical programs are significant factors that can affect our operating and financial results.

Refer to Part I, Item 1A. "Risk Factors" for a description of risks and uncertainties that may affect our clinical programs. Any of 
such risks and uncertainties may, among other matters, negatively impact the development timelines set forth in the table below.

6

Clinical Program

Phase 1

Phase 2

Phase 3

Regulatory 
Review(h)

2023 and 2024
Events to Date

Select Upcoming 
Milestones

EYLEA HD (aflibercept) 
8 mg(a)

Ophthalmology

–RVO

–Approved by U.S. Food 
and Drug Administration 
("FDA") for wAMD, 
DME, and DR

–Approved by European 
Commission ("EC") and 
Japan's Ministry of Health, 
Labour and Welfare 
("MHLW") for wAMD and 
DME

–Reported positive two-
year data from Phase 3 
studies in wAMD and 
DME
–Approved by FDA for 
ROP

–Initiate Phase 3 study in 
RVO (mid-2024) to enable 
FDA submission

–Initiate Phase 3 study in 
combination with 
cemdisiran in geographic 
atrophy (second half 2024)

–Ulcerative colitis

–Eosinophilic 
gastroenteritis 
(Phase 2/3)

Immunology & Inflammation

–Chronic obstructive 
pulmonary disease 
("COPD")(d)

–EoE in 
pediatrics (1–11 
years of age) 
(EU)

–Approved by EC for 
atopic dermatitis in 
pediatrics (6 months–5 
years of age)

–EC decision on 
regulatory submission for 
EoE in pediatrics (second 
half 2024)

–Bullous 
pemphigoid(c)

–Chronic 
spontaneous urticaria 
("CSU")

–Chronic pruritus of 
unknown origin

–COPD with 
type 2 
inflammatory 
phenotype (U.S. 
and EU) 

–CSU in adults 
and adolescents 
(Japan)

–FDA decision on 
supplemental Biologics 
License Application 
("sBLA") (mid/second half 
2024) and EC decision on 
regulatory submission 
(second half 2024) for 
COPD with type 2 
inflammatory phenotype

–Approved by MHLW for 
atopic dermatitis in 
pediatrics and adolescents 
(6 months–14 years of age)

–Approved by FDA for 
EoE in pediatrics (1–11 
years of age)

–Approved by EC for EoE 
in adults and adolescents

–Approved by MHLW for 
prurigo nodularis

7

EYLEA (aflibercept)(a)

Pozelimab(f) 
(REGN3918)
Antibody to C5

Dupixent (dupilumab)(b)
Antibody to IL-4R alpha 
subunit

Clinical Program 
(continued)
Dupixent (dupilumab)(b)
(continued)

Phase 1

Phase 2

Phase 3

Regulatory 
Review(h)

2023 and 2024
Events to Date

–Reported that Phase 3 
BOREAS trial in COPD 
with evidence of type 2 
inflammation met its 
primary and all key 
secondary endpoints; 
presented at 2023 
American Thoracic Society 
International Conference 
and published in New 
England Journal of 
Medicine

–Reported that results from 
interim analysis of 
replicate Phase 3 NOTUS 
trial in COPD with 
evidence of type 2 
inflammation met its 
primary endpoint

–FDA issued Complete 
Response Letter ("CRL") 
for sBLA for CSU due to 
requirement for additional 
efficacy data

–Phase 3 trial in chronic 
cold induced urticaria did 
not meet its required 
efficacy endpoints

–Discontinued further 
clinical development in 
allergic fungal 
rhinosinusitis and chronic 
rhinosinusitis without nasal 
polyposis
–Approved by FDA for 
PMR

Select Upcoming 
Milestones

–MHLW decision on 
regulatory submission for 
CSU in adults and 
adolescents (first half 
2024)

–Report results from 
ongoing Phase 3 trial in 
CSU (in biologic-naïve 
patients) (fourth quarter 
2024)

–Report results from Phase 
3 trial in bullous 
pemphigoid (second half 
2024)

–Initiate Phase 1 study in 
severe food allergy 
following transient 
linvoseltamab treatment  
(2024)

–EC decision on 
regulatory submission for 
PMR (second half 2024)

–FDA decision on sBLA 
(target action date of June 
10, 2024) and EC decision 
(second half 2024) on 
regulatory submission for 
pcJIA

Kevzara (sarilumab)(b)
Antibody to IL-6R

–Polyarticular-
course juvenile 
idiopathic arthritis 
("pcJIA") (pivotal 
study)

–Systemic juvenile 
idiopathic arthritis 
("sJIA") (pivotal 
study)

–PMR (EU)

–pcJIA (U.S. and 
EU)

8

Phase 1

Phase 2

Phase 3

–COPD(e)

Regulatory 
Review(h)

Clinical Program 
(continued)

Itepekimab(b) 
(REGN3500)
Antibody to IL-33

REGN5713-5714-5715
Multi-antibody therapy to 
Bet v 1

Libtayo (cemiplimab)(g)
Antibody to PD-1

Fianlimab(f) (REGN3767)
Antibody to LAG-3 

–Solid tumors 
and advanced 
hematologic 
malignancies

–Birch allergy

Solid Organ Oncology

–Neoadjuvant CSCC

–Adjuvant CSCC

–First-line NSCLC, 
BNT116(r) 
combination
–First-line advanced 
NSCLC (Phase 2/3) 
(pivotal study)

–First-line metastatic 
melanoma(e)

–First-line adjuvant 
melanoma

2023 and 2024
Events to Date
–Phase 3 COPD program 
passed interim futility 
analysis conducted by 
Independent Data 
Monitoring Committee 
("IDMC")

Select Upcoming 
Milestones
–Report results from Phase 
3 study in COPD (2025)

–Approved by EC for first-
line NSCLC, 
chemotherapy combination 

–Conduct interim analysis 
from Phase 3 study in 
adjuvant CSCC (second 
half 2024)

–Presented positive data 
from Phase 1 trial (in 
combination with Libtayo) 
in advanced melanoma at 
2023 American Society of 
Clinical Oncology 
("ASCO") Annual Meeting

–Initiate potentially pivotal 
Phase 2 study (in 
combination with Libtayo) 
in perioperative melanoma 
(first half 2024) 

–Initiate Phase 2 study (in 
combination with Libtayo) 
in perioperative NSCLC 
(first half 2024) 

–Initiate Phase 2 study (in 
combination with Libtayo) 
in perioperative head and 
neck squamous cell 
carcinoma (2024)

–Report potentially pivotal 
initial results from Phase 
2/3 study in first-line 
metastatic melanoma 
(second half 2024)

–Report initial data from 
Phase 2/3 study in first-
line advanced NSCLC 
(second half 2024)

Vidutolimod
Immune activator 
targeting TLR9

–Solid tumors

9

Clinical Program 
(continued)

Ubamatamab(f) 
(REGN4018)
Bispecific antibody 
targeting MUC16 and 
CD3

REGN5668(n)
Bispecific antibody 
targeting MUC16 and 
CD28
REGN5678
Bispecific antibody 
targeting PSMA and 
CD28

Phase 1

Phase 2
–Platinum-resistant 
ovarian cancer

–Platinum-
resistant ovarian 
cancer

–Prostate cancer

REGN4336
Bispecific antibody 
targeting PSMA and CD3
Davutamig (REGN5093)
Bispecific antibody 
targeting two distinct MET 
epitopes
REGN5093-M114
Bispecific antibody-drug 
conjugate targeting two 
distinct MET epitopes
REGN6569
Antibody to GITR
REGN7075
Bispecific antibody 
targeting EGFR and 
CD28

–Prostate cancer

–MET-altered 
advanced 
NSCLC

–MET 
overexpressing 
advanced cancer

–Solid tumors

–Solid tumors

Phase 3

Regulatory 
Review(h)

2023 and 2024
Events to Date

Select Upcoming 
Milestones

–Presented results from 
Phase 1/2 study (in 
combination with Libtayo) 
in platinum-resistant 
ovarian cancer at European 
Society for Medical 
Oncology ("ESMO") 
Congress

–Discontinued enrollment 
in cohorts in combination 
with full-dose Libtayo 
(cemiplimab)

–Expanded enrollment in 
monotherapy cohort

–Initiate cohorts in 
combination with 
REGN4336 in metastatic 
castration-resistant 
prostate cancer (first half 
2024)

–Initiate dose-expansion 
cohorts (in combination 
with Libtayo) in EGFR-
high tumors (first half 
2024)

10

Clinical Program 
(continued)

Phase 1

Phase 2

Phase 3

Regulatory 
Review(h)

2023 and 2024
Events to Date

Select Upcoming 
Milestones

Pozelimab(f) 
(REGN3918)
Antibody to C5

Odronextamab(m) 
(REGN1979)
Bispecific antibody 
targeting CD20 and CD3

–Certain B-cell 
malignancies(c)

–B-cell non-
Hodgkin lymphoma
 ("B-NHL") (pivotal 
study)

Hematology

–Myasthenia gravis, 
cemdisiran 
combination(c)(s)

–Paroxysmal 
nocturnal 
hemoglobinuria 
("PNH"), cemdisiran 
combination(c)(s)
–Follicular 
lymphoma ("FL") 

–Diffuse large B-cell 
lymphoma 
("DLBCL")

–Veopoz (pozelimab) 
approved by FDA for 
CHAPLE in adults and 
children aged 1 year and 
older, monotherapy 

–Relapsed/
refractory FL and 
DLBCL (U.S. 
and EU)

–Presented updated data 
from trials in patients with 
relapsed/refractory FL and 
DLBCL at American 
Society of Hematology 
("ASH") Annual Meeting

–FDA decision on BLA 
(target action date of 
March 31, 2024) and EC 
decision on regulatory 
submission (second half 
2024) for relapsed/
refractory FL and DLBCL

REGN5837(p)
Bispecific antibody 
targeting CD22 and CD28
Linvoseltamab(f) 
(REGN5458)
Bispecific antibody 
targeting BCMA and CD3

–B-NHL

–Multiple 
myeloma(c)(e)

–Multiple myeloma 
(pivotal study)(c)(e)

–Multiple 
myeloma(c)(e)

–Earlier (pre-
malignant) multiple 
myeloma

–Relapsed/
refractory 
multiple 
myeloma (U.S. 
and EU)

–Presented updated 
positive data from pivotal 
trial in multiple myeloma 
at ASCO and ASH Annual 
Meetings

–FDA decision on BLA 
(second half 2024) and EC 
decision on regulatory 
submission (first half 
2025) for relapsed/
refractory multiple 
myeloma

REGN5459(f)
Bispecific antibody 
targeting BCMA and CD3

REGN7257
Antibody to IL2Rg
NTLA-2001(j)
TTR gene knockout using 
CRISPR/Cas9
REGN9933
Antibody to Factor XI

–Transplant 
desensitization in 
patients with 
chronic kidney 
disease
–Aplastic anemia

–Transthyretin 
("ATTR") 
amyloidosis(c)

REGN7508
Antibody to Factor XI

–Thrombosis

–ATTR amyloidosis 
with cardiomyopathy 
("ATTR-CM")

–Thrombosis

11

–Report results from Phase 
2 study in thrombosis 
(second half 2024)

Clinical Program 
(continued)

REGN7999
Antibody to TMPRSS6

Phase 1
–Transfusion 
dependent iron 
overload

Phase 2

Phase 3

Regulatory 
Review(h)

2023 and 2024
Events to Date

Select Upcoming 
Milestones

Praluent (alirocumab)
Antibody to PCSK9

Evkeeza(f)(l) 
(evinacumab)
Antibody to ANGPTL3

Garetosmab(f) 
(REGN2477)
Antibody to Activin A

Trevogrumab(f) 
(REGN1033)
Antibody to myostatin 
(GDF8)

Mibavademab(f) 
(REGN4461)
Agonist antibody to leptin 
receptor ("LEPR")
REGN5381/REGN9035
Agonist antibody to NPR1/
reversal agent to 
REGN5381

–Generalized 
lipodystrophy(d)(e)

–Reversal agent 
in healthy 
volunteers

–Heart failure 

–Healthy 
volunteers

REGN7544
Antagonist antibody to 
NPR1
ALN-HSD(o)
RNAi therapeutic 
targeting HSD17B13

–Nonalcoholic 
steatohepatitis
("NASH")

Internal Medicine/Genetic Medicines

–HeFH in pediatrics 
and adolescents

–HeFH in 
pediatrics and 
adolescents (8–
17 years of age) 
(U.S.)

–Approved by EC for 
HeFH in pediatrics and 
adolescents (8–17 years of 
age)

–FDA decision on sBLA 
for HeFH in pediatrics and 
adolescents (target action 
date of March 10, 2024)

–Approved by FDA and 
EC for HoFH in pediatrics 
(5–11 years of age) and 
MHLW for HoFH in 
adults, adolescents, and 
pediatrics 

–Presented results from 
Phase 2 study in 
generalized lipodystrophy 
at ENDO 2023
–Resumed enrollment in 
previously paused Phase 1 
and Phase 2 studies 
following protocol 
amendments

–Reported positive initial 
data from Phase 1 trial in 
healthy volunteers

–Initiate Phase 2 study in 
combination with 
semaglutide with and 
without garetosmab 
(mid-2024)

–Fibrodysplasia 
ossificans 
progressiva 
("FOP")(c)(d)(e)

12

Clinical Program 
(continued)

ALN-PNP(k)
RNAi therapeutic 
targeting PNPLA3
ALN-APP(k)
RNAi therapeutic 
targeting APP

DB-OTO
AAV-based gene therapy

Phase 1

Phase 2

Phase 3

Regulatory 
Review(h)

2023 and 2024
Events to Date

Select Upcoming 
Milestones

–NASH

–Early-onset 
Alzheimer’s 
disease(q)

–Hearing loss in 
pediatrics(c) 
(Phase 1/2)

–Reported positive interim 
data from single dose part 
of Phase 1 trial in early-
onset Alzheimer’s disease
–Reported preliminary, 
positive safety and efficacy 
results from first patient 
dosed in Phase 1/2 trial in 
pediatrics with hearing loss

"Next Generation" 
Covid Antibody(i)
Antibody to SARS-CoV-2 
variants
REGN13335
Antagonist antibody to 
PDGF-B

–Healthy 
volunteers

–Healthy 
volunteers

13

Note: For purposes of the table above, a program is classified in Phase 1, 2, or 3 clinical development after recruitment for the corresponding study or studies has commenced.
(a) In collaboration with Bayer outside the United States
(b) In collaboration with Sanofi
(c) FDA granted orphan drug designation
(d) FDA granted Breakthrough Therapy designation
(e) FDA granted Fast Track designation
(f) Sanofi did not opt-in to or elected not to continue to co-develop the product candidate. Under the terms of our agreement, Sanofi is entitled to receive royalties on sales of the product, if 
any.
(g) Studied as monotherapy and in combination with other antibodies and treatments
(h) Information in this column relates to U.S., EU, and Japan regulatory submissions only
(i) We and the Biomedical Advanced Research and Development Authority ("BARDA") of the U.S. Department of Health and Human Services ("HHS") are parties to an agreement whereby 
HHS provides certain funding to support research and development activities.
(j) In collaboration with Intellia
(k) In collaboration with Alnylam
(l) In collaboration with Ultragenyx outside the United States
(m) FDA granted Fast Track designation for follicular lymphoma and diffuse large B-cell lymphoma
(n) Studied in combination with ubamatamab
(o) Alnylam elected to opt-out of the product candidate. Under the terms of our agreement, Alnylam is entitled to receive royalties on sales of the product, if any.
(p) Studied in combination with odronextamab
(q) Part B of the study (multi-dose regimen) placed on partial clinical hold in the U.S. by the FDA due to findings observed in prior non-clinical chronic toxicology studies
(r) BioNTech's BNT116 is an mRNA cancer vaccine.
(s) Under the terms of our license agreement for the combination consisting of cemdisiran and pozelimab, Alnylam is entitled to receive royalties on sales of the combination (if any), as well 
as sales milestones.

14

Additional Information - Clinical Development Programs

EYLEA HD (aflibercept) 8 mg

In August 2023, the FDA approved the BLA for EYLEA HD for the treatment of patients with wAMD, DME, and DR.

Previously,  in  June  2023,  the  FDA  issued  a  CRL  for  the  EYLEA  HD  BLA.  The  CRL  was  issued  solely  due  to  unresolved 
observations resulting from a May 2023 FDA inspection at a third-party contract manufacturing organization, Catalent, that the 
Company engaged to complete vial-filling for EYLEA HD. With the approval of EYLEA HD, the pre-approval inspection issues 
related to the BLA had been addressed.

In  June  2023  and  August  2023,  the  Company  announced  top-line,  two-year  (96  weeks)  data  for  EYLEA  HD  from  the  pivotal 
PHOTON  trial  in  patients  with  DME  and  the  pivotal  PULSAR  trial  in  patients  with  wAMD,  respectively.  In  addition,  in  July 
2023, the results from the PHOTON trial were presented at the American Society of Retina Specialists annual meeting. During 
both trials, EYLEA HD patients were initially randomized to either 12- or 16-week dosing intervals (after three initial monthly 
doses) and were able to shorten or extend dosing intervals if pre-specified criteria were met. The longer-term data among EYLEA 
HD patients who completed the trials demonstrated that the vast majority of patients were able to maintain or further extend these 
dosing intervals through two years with:

PHOTON:

•
•

•

89% maintaining ≥12-week dosing intervals through two years, compared to 93% through one year (48 weeks)
84% maintaining ≥16-week dosing intervals through two years, compared to 89% maintaining a 16-week dosing interval 
through one year
44% meeting the criteria for ≥20-week dosing intervals by week 96, including 17% and 27% who were eligible for 20- 
and 24-week dosing intervals, respectively

PULSAR:

•
•

•

•

88% on a ≥12-week dosing interval at the end of two years
78% maintaining ≥12-week dosing intervals through two years, compared to 83% throughout the first year of study (48 
weeks)
71% meeting the extension criteria for even longer dosing intervals, including 47% for ≥20-week intervals and 28% for 
24-week intervals
those assigned to ≥16-week dosing regimen at baseline, 70% maintaining ≥16-week dosing intervals throughout the two-
year study period; at the end of two years, 78% were eligible for ≥16-week dosing, with 53% eligible for ≥20-dosing 
week intervals.

The visual gains for EYLEA HD remained consistent with the first year of the trials. In both PHOTON and PULSAR, the safety 
of EYLEA HD also continued to be similar to EYLEA through two years and remained consistent with the known safety profile 
of EYLEA from previous clinical trials for DME and wAMD.

In May 2023, Bayer announced that it initiated a Phase 3 study to evaluate the efficacy and safety of EYLEA HD at extended 
dosing intervals compared to the standard of care, EYLEA, in RVO to support potential future regulatory submissions outside the 
United States.

Dupixent

COPD

In March 2023, the Company and Sanofi announced that the primary and all key secondary endpoints were met in the BOREAS 
trial  (the  first  of  two  Phase  3  trials)  in  adults  currently  on  maximal  standard-of-care  inhaled  therapy  (triple  therapy)  with 
uncontrolled COPD and evidence of type 2 inflammation. In this trial, patients receiving Dupixent experienced a 30% reduction 
in moderate or severe acute COPD exacerbations (rapid and acute worsening of respiratory symptoms) compared to placebo over 
52 weeks, while also demonstrating significant improvements in lung function, quality of life, and COPD respiratory symptoms. 

In November 2023, the Company and Sanofi announced that the replicate Phase 3 NOTUS trial met its primary endpoint, showing 
Dupixent  significantly  reduced  exacerbations  by  34%  compared  to  placebo  over  52  weeks  in  patients  with  moderate-to-severe 
COPD  with  evidence  of  type  2  inflammation,  confirming  results  from  the  BOREAS  pivotal  trial.  Given  the  overwhelming 
positive efficacy of the primary endpoint in the interim analysis from the NOTUS trial, the results will be considered the primary 
analysis  of  the  trial.  In  December  2023,  the  Company  and  Sanofi  submitted  the  data  from  this  interim  analysis  of  the  NOTUS 
trial, along with the results from the Phase 3 BOREAS trial, to the FDA.

15

The safety results for the BOREAS and NOTUS trials were generally consistent with the known safety profile of Dupixent in its 
approved indications.

CSU

In  October  2023,  the  FDA  issued  a  CRL  for  the  sBLA  for  Dupixent  in  CSU.  The  CRL  states  that  additional  efficacy  data  are 
required to support an approval; it did not identify any issues with safety or manufacturing. An ongoing Phase 3 clinical trial (in 
biologic-naïve patients) continues to enroll patients, with results expected in late 2024.

REGN5678

In the ongoing Phase 1 study of REGN5678, the Company has observed antitumor activity in combination with Libtayo as well as 
with  REGN5678  monotherapy.  Due  to  the  emerging  safety  profile,  including  two  immune-mediated  Grade  5  adverse  events 
(death),  the  Company  discontinued  enrollment  of  patients  receiving  the  combination  of  REGN5678  and  full-dose  Libtayo 
(cemiplimab).  The  Company  has  since  expanded  enrollment  in  a  REGN5678  monotherapy  cohort  and  plans  to  explore  other 
REGN5678 combinations.

Descriptions  of  Marketed  Products  Studied  in  Additional  Indications  and  Product  Candidates  in  Late-Stage  Clinical 
Development 

EYLEA HD (aflibercept) 8 mg

EYLEA  HD  is  a  soluble  fusion  protein  that  acts  as  a  vascular  endothelial  growth  factor  ("VEGF")  inhibitor.  Through  a  novel 
formulation, it is designed to deliver a concentrated dose of aflibercept to block VEGF-A and PLGF and inhibit the growth of new 
blood vessels and decrease vascular permeability to treat various retinal diseases, including wAMD, DME, and DR.

Dupixent (dupilumab)

Dupixent  is  a  fully  human  monoclonal  antibody  that  inhibits  signaling  of  the  IL-4  and  IL-13  pathways,  and  is  not  an 
immunosuppressant.  IL-4  and  IL-13  are  key  and  central  drivers  of  the  type  2  inflammation  that  plays  a  major  role  in  atopic 
dermatitis, asthma, CRSwNP, EoE, prurigo nodularis, and potentially other chronic allergic and inflammatory diseases, including 
COPD.

Kevzara (sarilumab)

Kevzara is a fully human monoclonal antibody that binds specifically to the IL-6 receptor and inhibits IL-6-mediated signaling. 
IL-6  is  an  immune  system  protein  produced  in  increased  quantities  in  patients  with  RA  and  has  been  associated  with  disease 
activity, joint destruction, and other systemic problems.

Itepekimab

Itepekimab is an investigational, fully human monoclonal antibody that inhibits IL-33, a protein that is believed to play a key role 
in lung inflammation in COPD.

REGN5713-5714-5715

REGN5713-5714-5715  is  an  investigational  combination  of  three  fully  human  monoclonal  antibodies  designed  to  treat  allergic 
inflammatory  conditions  caused  by  the  allergen  Betv1,  which  is  the  main  allergen  responsible  for  birch  pollen  allergies.  Birch 
pollen allergy is one of the most common causes of seasonal allergies that occur in the spring, and is also believed to trigger "oral 
allergy syndrome" food reactions to related allergens found in nuts and fruits such as apples, pears, and cherries.

Libtayo (cemiplimab)

Libtayo is a fully human monoclonal antibody targeting the immune checkpoint receptor PD-1 on T-cells that has been approved 
by regulatory authorities for five different cancers. The PD-1/PD-L1 immune checkpoint pathway is a well-known mechanism by 
which  cancers  evade  immune  destruction.  Regeneron  is  studying  Libtayo  as  monotherapy  and  in  combination  with  either 
conventional or novel therapeutic approaches in various solid tumors and blood cancers. It is also being studied in combination 
with proprietary anti-cancer assets of other companies. 

Fianlimab

Fianlimab is an investigational, fully human monoclonal antibody targeting the immune checkpoint receptor LAG-3 on T-cells. In 
melanoma, LAG-3 expression in the tumor microenvironment may be associated with therapeutic resistance to PD-1 inhibitors. 
Fianlimab is being investigated in combination with Libtayo to determine whether concurrent blockade of LAG-3 and PD-1 can 
help overcome this resistance and release the brakes on T-cell activation.

16

Pozelimab

Pozelimab is a fully human monoclonal antibody designed to block complement factor C5 in order to treat diseases mediated by 
abnormal complement pathway activity, and is approved by the FDA for CHAPLE. Pozelimab is being studied in investigational 
combinations with an investigational small interfering RNA ("siRNA") therapy, cemdisiran, in PNH and myasthenia gravis.

Odronextamab

Odronextamab  is  an  investigational  bispecific  monoclonal  antibody  designed  to  bind  to  a  component  of  the  T-cell  receptor 
("TCR")  complex  (CD3),  while  also  binding  and  bridging  T-cells  to  a  protein  expressed  on  B-cells  (CD20).  We  are  studying 
whether  odronextamab  may  help  to  activate  T-cells  via  their  CD3  receptors  and  trigger  targeted,  T-cell  mediated  killing  of 
cancerous cells in several types of B-cell non-Hodgkin lymphoma.

Linvoseltamab

Linvoseltamab is an investigational bispecific monoclonal antibody designed to bind to CD3 while also binding and bridging T-
cells to the BCMA protein on multiple myeloma cells. We are studying whether linvoseltamab may help to activate T-cells via 
their CD3 receptors and trigger targeted, T-cell mediated killing of multiple myeloma.

NTLA-2001

NTLA-2001 is an investigational CRISPR-based therapy to be systemically delivered to edit genes inside the human body and is 
being  studied  as  a  treatment  for  ATTR  amyloidosis.  ATTR  amyloidosis  is  a  progressive  and  fatal  disorder  resulting  from 
deposition  of  insoluble  amyloid  fibrils  into  multiple  organs  and  tissues  leading  to  systemic  failure.  Delivered  with  in  vivo 
technology, NTLA-2001 offers the possibility of halting and reversing the disease by driving a deep, consistent, and potentially 
lifelong reduction in transthyretin ("TTR") protein after a single dose.

Praluent (alirocumab)

Praluent  is  a  fully  human  monoclonal  antibody  that  inhibits  the  binding  of  PCSK9  to  the  LDL  receptor.  Through  inhibiting 
PCSK9, Praluent increases the number of available LDL receptors on the surface of liver cells to clear LDL, which lowers LDL 
cholesterol levels in the blood. 

Evkeeza (evinacumab)

Evkeeza is a fully human monoclonal antibody that specifically binds to and blocks ANGPTL3. ANGPTL3 plays a key role in 
regulating  plasma  lipid  levels,  including  triglycerides,  LDL  cholesterol,  and  HDL  cholesterol,  through  inhibition  of  lipase 
enzymes (lipoprotein lipase and endothelial lipase).

Garetosmab

Garetosmab  is  an  investigational,  fully-human  monoclonal  antibody  that  binds  to  and  neutralizes  Activin  A,  which  drives  the 
abnormal bone formation that is the main pathology of the ultra-rare genetic disorder FOP. This abnormal bone formation in soft 
tissue outside of the normal skeleton, a process known as heterotopic ossification, leads to loss of mobility and premature death in 
FOP  patients.  Garetosmab  is  being  investigated  to  determine  whether  it  can  help  reduce  and/or  prevent  the  formation  of 
heterotopic bone lesions by neutralizing the Activin A protein.

Other Programs

Our preclinical research programs include the areas of oncology/immuno-oncology, angiogenesis, ophthalmology, metabolic and 
related diseases, muscle diseases and disorders, inflammation and immune diseases, bone and cartilage, pain and neurobiology, 
auditory  conditions,  enzyme  replacement  therapy,  cardiovascular  diseases,  infectious  diseases,  and  diseases  related  to  aging. 
These preclinical research programs include both rare diseases and those involving broader populations.

Research and Development Technologies

Many proteins that play an important role in biology and disease are secreted by cells or located on the cell surface. Moreover, 
cells  communicate  through  secreted  factors  and  surface  molecules.  Our  scientists  have  developed  two  different  technologies  to 
make protein therapeutics that potently and specifically block, activate, or inhibit the action of specific cell surface or secreted 
molecules.  The  first  technology  fuses  receptor  components  to  the  constant  region  of  an  antibody  molecule  to  make  a  class  of 
drugs  we  call  "Traps."  EYLEA  HD,  EYLEA,  ZALTRAP,  and  ARCALYST  are  drugs  generated  using  our  Trap  technology. 
VelociSuite® is our second technology platform, which is used for discovering, developing, and producing fully human antibodies 
that can address both secreted and cell-surface targets.

17

VelociSuite 

VelociSuite consists of VelocImmune®, VelociGene®, VelociMouse®, VelociMab®, Veloci-Bi®, VelociT®, VelociHum®, and other 
related  technologies.  The  VelocImmune  mouse  platform  is  utilized  to  produce  fully  human  antibodies.  VelocImmune  was 
generated by leveraging our VelociGene technology (see below), in a process in which six megabases of mouse immunoglobulin 
gene loci were replaced, or "humanized," with corresponding human immunoglobulin gene loci. VelocImmune mice can be used 
efficiently to generate fully human antibodies to targets of therapeutic interest. VelocImmune and our entire VelociSuite offer the 
potential  to  increase  the  speed  and  efficiency  through  which  human  antibody  therapeutics  may  be  discovered  and  validated, 
thereby  improving  the  overall  efficiency  of  our  early-stage  drug  development  activities.  We  are  utilizing  the  VelocImmune 
technology to produce our next generation of therapeutic antibody drug candidates for preclinical and clinical development.

Our VelociGene platform allows custom and precise manipulation of very large sequences of DNA to produce highly customized 
alterations of a specified target gene, or genes, and accelerates the production of knock-out and transgenic expression models. In 
producing knock-out models, a color or fluorescent marker may be substituted in place of the actual gene sequence, allowing for 
high-resolution  visualization  of  precisely  where  the  gene  is  active  in  the  body  during  normal  body  functioning  as  well  as  in 
disease  processes.  For  the  optimization  of  preclinical  development  and  pharmacology  programs,  VelociGene  offers  the 
opportunity  to  humanize  targets  by  replacing  the  mouse  gene  with  the  human  homolog  or  variants  thereof.  Thus,  VelociGene 
allows scientists to rapidly identify the physical and biological effects of deleting or over-expressing the target gene, as well as to 
characterize and test potential therapeutic molecules.

Our VelociMouse technology platform allows for the direct and immediate generation of genetically altered mice from embryonic 
stem cells ("ES cells"), thereby avoiding the lengthy process involved in generating and breeding knockout mice from chimeras. 
Mice  generated  through  this  method  are  normal  and  healthy  and  exhibit  a  100%  germ-line  transmission.  Furthermore,  mice 
developed using our VelociMouse technology are suitable for direct phenotyping or other studies. 

We  have  also  developed  our  VelociMab  platform  for  the  rapid  screening  of  antibodies  and  rapid  generation  of  expression  cell 
lines for our Traps and our VelocImmune human antibodies.

We  have  utilized  our  VelociSuite  technologies  to  develop  a  class  of  potential  drug  candidates,  known  as  bispecific  antibodies. 
Veloci-Bi allows for the generation of full-length bispecific antibodies similar to native antibodies that are amenable to production 
by standard antibody manufacturing techniques, and are likely to have favorable antibody-like pharmacokinetic properties. In the 
area of immunotherapies in oncology, we are exploring the use of bispecific antibodies that target tumor antigens and the CD3 
receptor on T-cells to harness the oncolytic properties of T-cells. We are exploring additional indications and applications for our 
bispecific technologies, including a new class of CD28 and 4-1BB costimulatory bispecifics. We are also exploring a variety of 
alternative antibody formats (Altibodies™) that can bring binding partners together in restrained geometries.

The VelociT mouse extends our research and drug discovery capabilities into cell-mediated immunity and therapeutic TCRs for 
oncology  and  other  indications.  VelociT  was  developed  by  using  our  VelociGene  technology  to  humanize  genes  encoding 
TCRα and TCRβ variable sequences, CD4 and CD8 co-receptors, β2m, and class-I and -II major histocompatibility complexes. 
As a result, VelociT mice can be utilized to produce fully human TCRs, providing for customized modeling of T-cell function in 
different  diseases  and  a  powerful  platform  for  the  discovery  of  unique  TCR-based  therapies.  We  are  also  able  to  produce 
antibodies that recognize intracellular peptides bound in the groove of human leukocyte antigen ("HLA"), enabling the targeting 
of intracellular proteins in cancer cells.

VelociHum is our immunodeficient mouse platform that can be used to accurately test human therapeutics against human immune 
cells and to study human tumor models. Through genetic humanizations, VelociHum mice have been optimized to allow for better 
development of human immune cells in vivo, as well as to allow for engraftment of primary patient-derived tumors that do not 
take in other commercially available mice.

18

Regeneron Genetics Center® 

Regeneron Genetics Center LLC (RGC®), a wholly owned subsidiary of Regeneron Pharmaceuticals, Inc., leverages de-identified 
clinical, genomic, and other types of molecular data from properly consented human volunteers from around the world to identify 
medically  relevant  associations  in  a  blinded  fashion  designed  to  preserve  a  patient's  privacy  while  uncovering  the  unique 
characteristics  of  their  health  and  wellness.  The  objective  of  RGC  is  to  expand  the  use  of  human  genetics  for  discovering  and 
validating genetic factors that cause or influence a range of diseases where there are major unmet medical needs, with the prospect 
of improving the drug discovery and development process and to advance innovation in clinical care design. RGC is undertaking 
multiple collaborative approaches to study design and implementation, including large population-based efforts that engage study 
participants to more discrete disease specific and founder populations with data on strategic phenotypes of interest. RGC utilizes 
laboratory automation and innovative approaches to cloud computing to achieve high-quality throughput, attaining more than 2 
million samples sequenced to date.

Central to the work of RGC is the portfolio of collaborations with over 100 academic and clinical collaborators around the world, 
including the University of Colorado, Geisinger Health System, Mayo Clinic, University of Pennsylvania, UCLA Medical Center, 
UK Biobank, University of Oxford, University of Cambridge, and the University of Helsinki. These collaborations provide access 
to biological samples and associated phenotype data from properly consented patient volunteers for purposes of genomic research. 
RGC  undertakes  genetic  sequencing  of  these  samples  to  create  a  unique  resource  of  de-identified  genetic  data  and  associated 
phenotype data for research. Furthermore, the RGC has deployed bulk RNA sequencing, whole genome sequencing, and an O-
LINK proteomic assay to complement whole exome sequencing and genotyping. In addition, the RGC leverages organoid models, 
siRNA, and CRISPR knockout models to validate genetic associations that lead to new therapeutic targets. The RGC continues to 
publish results from its research efforts in journals and publications in partnership with its collaborators to advance the field of 
genomics.

These efforts at the RGC have led to the identification of more than 30 novel genetic targets. Through our Regeneron Genetics 
Medicines initiative, we are currently advancing these targets using either our VelociSuite technologies or other technologies, such 
as siRNA gene silencing, genome editing, and targeted viral-based gene delivery and expression. See the "Collaboration, License, 
and Other Agreements" section below for descriptions of our collaborations with Alnylam and Intellia Therapeutics, Inc.

Collaboration, License, and Other Agreements

Sanofi

Antibody

We are collaborating with Sanofi on the global development and commercialization of Dupixent, Kevzara, and itepekimab (the 
"Antibody  Collaboration").  Under  the  terms  of  the  Antibody  License  and  Collaboration  Agreement  (the  "LCA"),  Sanofi  is 
generally responsible for funding 80% to 100% of agreed-upon development costs. We are obligated to reimburse Sanofi for 30% 
to  50%  of  worldwide  development  expenses  that  were  funded  by  Sanofi  based  on  our  share  of  collaboration  profits  from 
commercialization  of  collaboration  products.  Under  the  terms  of  the  LCA,  we  were  required  to  apply  10%  of  our  share  of  the 
profits from the Antibody Collaboration in any calendar quarter to reimburse Sanofi for these development costs. On July 1, 2022, 
an amendment to the LCA became effective, pursuant to which the percentage of Regeneron’s share of profits used to reimburse 
Sanofi for such development costs increased from 10% to 20%.

Under our collaboration agreement, Sanofi records product sales for commercialized products, and Regeneron has the right to co-
commercialize such products on a country-by-country basis. We co-commercialize Dupixent in the United States and in certain 
countries outside the United States. We supply certain commercial bulk product to Sanofi. We and Sanofi equally share profits 
from  sales  within  the  United  States.  We  and  Sanofi  share  profits  outside  the  United  States  on  a  sliding  scale  based  on  sales 
starting at 65% (Sanofi)/35% (us) and ending at 55% (Sanofi)/45% (us). In each of 2020 and 2021, we earned a $50.0 million 
sales-based milestone from Sanofi, upon aggregate annual sales of antibodies outside the United States (including Praluent, which 
was  previously  included  in  the  LCA)  exceeding  $1.0  billion  and  $1.5  billion,  respectively,  on  a  rolling  twelve-month  basis.  In 
2022,  we  earned  two  additional  $50.0  million  sales-based  milestones,  upon  aggregate  annual  sales  of  antibodies  outside  the 
United States (including Praluent) exceeding $2.0 billion and $2.5 billion, respectively, on a rolling twelve-month basis, and in 
2023, we earned the final $50.0 million sales-based milestone from Sanofi, upon aggregate annual sales of antibodies outside the 
United States (including Praluent) exceeding $3.0 billion on a rolling twelve-month basis.

Immuno-Oncology

We  previously  collaborated  with  Sanofi  for  antibody-based  cancer  treatments  in  the  field  of  immuno-oncology  (the  "IO 
Collaboration"). Under the terms of the Immuno-oncology License and Collaboration Agreement, the parties were co-developing 
and co-commercializing Libtayo. The parties shared equally development and commercialization expenses for Libtayo. We had 
principal  control  over  the  development  of  Libtayo  and  led  commercialization  activities  in  the  United  States,  while  Sanofi  led 

19

commercialization  activities  outside  the  United  States.  The  parties  shared  equally  in  profits  and  losses  in  connection  with  the 
commercialization of Libtayo.

Effective July 1, 2022, we obtained the exclusive right to develop, commercialize, and manufacture Libtayo worldwide under an 
Amended  and  Restated  Immuno-oncology  License  and  Collaboration  Agreement  with  Sanofi  (the  "A&R  IO  LCA").  In 
connection with the A&R IO LCA, in 2022, the Company made a $900.0 million up-front payment to Sanofi, as well as a $100.0 
million regulatory milestone payment. In addition, Sanofi was eligible to earn an aggregate of $100.0 million in Libtayo sales-
based milestones under the terms of the A&R IO LCA, of which they earned $65.0 million in 2022 and $35.0 million in 2023. We 
also  pay  Sanofi  an  11%  royalty  on  net  product  sales  of  Libtayo  through  March  31,  2034.  The  parties  have  also  entered  into  a 
transition services agreement, a transitional distribution agreement, and a manufacturing services agreement, pursuant to which, 
during  certain  transitional  periods,  Sanofi  will  perform  for  the  Company  certain  transition,  distribution,  and  manufacturing 
services, respectively.

Under the terms of the IO Collaboration, we were obligated to reimburse Sanofi for half of the development costs it funded that 
were attributable to clinical development of product candidates from our share of profits from commercialized IO Collaboration 
products.  Under  the  A&R  IO  LCA,  the  amount  of  development  costs  incurred  under  the  IO  Collaboration  for  which  we  are 
obligated to reimburse Sanofi was $35.0 million as of the effective date of the A&R IO LCA, and we pay Sanofi a 0.5% royalty 
on net product sales of Libtayo until all such development costs have been reimbursed by us.

Bayer 

We and Bayer are parties to a license and collaboration agreement for the global development and commercialization of EYLEA 
8  mg  and  EYLEA  outside  the  United  States.  Agreed-upon  development  expenses  incurred  by  the  Company  and  Bayer  are 
generally shared equally. Bayer is responsible for commercialization activities outside the United States, and the companies share 
equally in profits from such sales.

We are obligated to reimburse Bayer for 50% of the development costs that it has incurred under the agreement from our share of 
the collaboration profits. The reimbursement payment in any quarter will equal 5% of the then outstanding repayment obligation, 
but never more than our share of the collaboration profits in the quarter unless we elect to reimburse Bayer at a faster rate. 

Within the United States, we retain exclusive commercialization rights and are entitled to all profits from such sales.

Alnylam

In  2019,  we  and  Alnylam  Pharmaceuticals,  Inc.  entered  into  a  global,  strategic  collaboration  to  discover,  develop,  and 
commercialize RNAi therapeutics for a broad range of diseases by addressing therapeutic disease targets expressed in the eye and 
central  nervous  system  ("CNS"),  in  addition  to  a  select  number  of  targets  expressed  in  the  liver.  In  connection  with  the 
collaboration,  the  Company  made  an  up-front  payment  of  $400.0  million  to  Alnylam,  and  also  purchased  shares  of  Alnylam 
common  stock  for  $400.0  million.  For  each  program,  we  provide  Alnylam  with  a  specified  amount  of  funding  at  program 
initiation and at lead candidate designation. During 2023, we paid a $100.0 million development milestone to Alnylam upon the 
achievement of specified proof-of-principle criteria for the ALN-APP program and Alnylam is eligible to receive an additional 
$100.0 million clinical proof-of-principle milestone in connection with an eye program. 

Under  the  terms  of  the  collaboration,  the  parties  perform  discovery  research  until  designation  of  lead  candidates.  Following 
designation  of  a  lead  candidate,  the  parties  may  further  advance  such  lead  candidate  under  either  a  co-development/co-
commercialization  collaboration  agreement  ("Co-Co  Collaboration  Agreement")  (under  which  the  parties  are  advancing  ALN-
APP and ALN-PNP, which are currently in clinical development) or a license agreement structure. The initial target nomination 
and  discovery  period  is  five  years  (which  may  under  certain  situations  automatically  be  extended  for  up  to  seven  years  in  the 
aggregate) (the "Research Term"). In addition, we have an option to extend the Research Term for an additional five-year period 
for a research extension fee of $300.0 million.

For CNS programs and liver programs, under a Co-Co Collaboration Agreement, the party designated as the lead party will lead 
development and commercialization of the program and the parties will split profits and share costs equally, subject to certain co-
funding opt-outs at specified clinical trial phases or under other conditions. Alnylam is the lead party for ALN-APP, and we are 
the lead party for ALN-PNP.

Under  a  license  agreement,  the  lead  party  is  designated  as  the  licensee  and  has  the  right  to  develop  and  commercialize  the 
collaboration product under such program. The licensee will be responsible for its own costs and expenses incurred. The licensee 
will  pay  to  the  licensor  certain  development  and/or  commercialization  milestone  payments,  as  well  as  certain  tiered  royalty 
payments to the licensor based on the aggregate annual net sales of the collaboration product.

20

The  parties  have  entered  into  various  license  agreements,  including  for  a  combination  consisting  of  cemdisiran  (an  siRNA 
therapeutic targeting the C5 component of the human complement pathway being developed by Alnylam) and pozelimab, with us 
as the licensee. 

Intellia

In 2016, we entered into a license and collaboration agreement with Intellia to advance CRISPR/Cas9 gene-editing technology for 
in  vivo  therapeutic  development.  NTLA-2001,  which  is  in  clinical  development,  is  subject  to  a  co-development  and  co-
commercialization arrangement pursuant to which Intellia will lead development and commercialization activities and the parties 
share an agreed-upon percentage of development expenses and profits (if commercialized).

In 2020, we expanded our existing collaboration with Intellia to provide us with rights to develop products for additional in vivo 
CRISPR/Cas9-based  therapeutic  targets  and  for  the  companies  to  jointly  develop  potential  products  for  the  treatment  of 
hemophilia A and B, with Regeneron leading development and commercialization activities. In addition, we also received non-
exclusive  rights  to  independently  develop  and  commercialize  ex  vivo  gene  edited  products.  In  connection  with  the  2020 
agreement, we made a $70.0 million up-front payment to Intellia.

In  September  2023,  we  further  expanded  our  existing  collaboration  to  develop  additional  in  vivo  CRISPR-based  gene  editing 
therapies focused on neurological and muscular diseases. Intellia will lead the design of the editing methodology, we will lead the 
design of the targeted viral vector delivery approach, and the parties share costs equally. Each company will have the opportunity 
to lead potential development and commercialization of product candidates for one target, and the company that is not leading 
development and commercialization will have the option to enter into a co-development and co-commercialization agreement for 
the target.

In October 2023, we elected to extend the period for selecting targets under the 2016 license and collaboration agreement for an 
additional two years until April 2026; as a result, we became obligated to make a $30.0 million extension payment to Intellia.

Decibel 

In  2017,  we  entered  into  an  agreement  with  Decibel  Therapeutics,  Inc.  to  discover  and  develop  new  potential  therapeutics  to 
protect, repair and restore hearing (including DB-OTO, which is currently in clinical development, and preclinical programs for 
GJB2-related and stereocilin-related hearing loss). 

In August 2023, we entered into an Agreement and Plan of Merger to acquire Decibel, and in September 2023, we completed the 
acquisition  of  Decibel.  We  paid  $101.3  million  in  cash  (or  $4.00  per  share  of  Decibel  common  stock).  In  addition,  Decibel 
shareholders received one non-tradeable contingent value right ("CVR") per share of Decibel common stock, which entitles the 
holder to receive up to $3.50 per share in cash upon achievement of certain clinical development and regulatory milestones for 
DB-OTO within specified time periods. The maximum aggregate amount that holders of the CVRs may be entitled to receive if 
all the milestones contemplated by the CVRs are achieved is approximately $97 million.

BARDA

In August 2023, we expanded our existing Other Transaction Agreement ("OTA") with BARDA, pursuant to which the HHS is 
obligated  to  fund  up  to  70%  of  our  costs  incurred  for  certain  development  activities  related  to  a  next-generation  COVID-19 
monoclonal antibody therapy for the prevention of SARS-CoV-2 infection. Pursuant to the terms of the expanded agreement, we 
could  receive  payments  of  up  to  approximately  $326  million  in  the  aggregate  to  support  clinical  development,  clinical 
manufacturing, and the regulatory licensure process.

Manufacturing

We  currently  manufacture  bulk  drug  materials  and  products  at  our  manufacturing  facilities  in  Rensselaer,  New  York  and 
Limerick, Ireland. These facilities consist of owned and leased research, manufacturing, office, laboratory, and warehouse space. 
In addition, we have constructed a fill/finish facility in Rensselaer, New York that is undergoing process validation as required by 
regulatory authorities.

We currently have approximately 100,000 liters of cell culture capacity at our Rensselaer facility and approximately 120,000 liters 
of  cell  culture  capacity  at  our  Limerick  facility.  Each  of  these  facilities  is  approved  by  the  FDA  and  certain  other  regulatory 
agencies to manufacture our bulk drug materials and products. 

Certain  bulk  drug  materials  and  products  are  also  manufactured  by  our  collaborators,  and  certain  raw  materials  or  products 
necessary for the manufacture and formulation of our products and product candidates are provided by single-source unaffiliated 
third-party suppliers. In addition, we rely on our collaborators or third parties to perform packaging, filling, finishing, labeling, 
distribution,  laboratory  testing,  and  other  services  related  to  the  manufacture  of  our  products  and  product  candidates,  and  to 

21

supply various raw materials and other products. See Part I, Item 1A. "Risk Factors - Risks Related to Manufacturing and Supply" 
for further information.

Among  the  conditions  for  regulatory  marketing  approval  of  a  medicine  is  the  requirement  that  the  prospective  manufacturer's 
quality  control  and  manufacturing  procedures  conform  to  the  good  manufacturing  practice  ("GMP")  regulations  of  the  health 
authority. In complying with standards set forth in these regulations, manufacturers must continue to expend time, money, and 
effort  in  the  areas  of  production  and  quality  control  to  ensure  full  technical  compliance.  Manufacturing  establishments,  both 
foreign and domestic, are also subject to inspections by or under the authority of the FDA and by other national, federal, state, and 
local agencies. 

Commercial 

Our medicines are marketed through our commercial group, which includes experienced professionals in the fields of marketing, 
sales, professional education, patient education, reimbursement and market access, trade and distribution, commercial operations, 
commercial analytics, and market research.

In  the  United  States,  we  sell  our  marketed  products  primarily  to  wholesalers  and  specialty  distributors  that  serve  pharmacies, 
hospitals,  government  agencies,  physicians,  and  other  healthcare  providers.  We  had  sales  to  two  customers  (Besse  Medical,  a 
subsidiary of Cencora, Inc., and McKesson Corporation) that each accounted for more than 10% of total gross product revenue for 
the year ended December 31, 2023. On a combined basis, our product sales to these customers accounted for 76% of our total 
gross product revenue for the year ended December 31, 2023. We promote approved medicines to healthcare professionals via our 
team  of  field  employees,  as  well  as  medical  journals,  medical  exhibitions,  distribution  of  literature  and  samples,  and  online 
channels.  In  addition,  we  advertise  certain  products  directly  to  consumers  and  maintain  websites  with  information  about  our 
medicines.  The  commercial  group  also  evaluates  opportunities  for  our  targets  and  product  candidates  and  prepares  for  market 
launches of new medicines.

We have established certain commercial capabilities outside the United States in connection with co-commercializing Dupixent in 
accordance with our Sanofi collaboration agreement. In addition, we are in process of building additional commercial capabilities 
outside the United States as a result of us obtaining the rights, in 2022, to commercialize Libtayo outside the United States.

Competition

We face substantial competition from pharmaceutical, biotechnology, and chemical companies. Our ability to compete depends, 
to  a  great  extent,  on  how  fast  we  can  develop  safe  and  effective  product  candidates,  complete  clinical  testing  and  approval 
processes, and supply commercial quantities of the product to the market. Competition among products approved for sale is based 
on efficacy, safety, reliability, availability, price, patent and other intellectual property position, and other factors.  

Marketed Products

The  table  below  provides  an  overview  of  the  current  competitive  landscape  for  key  products  marketed  by  us  and/or  our 
collaborators in such products' currently approved indications. The table below is provided for illustrative purposes only and is 
not exhaustive. For additional information regarding the substantial competition these marketed products face, including potential 
future  competition  from  product  candidates  in  clinical  development,  see  also  Part  I,  Item  1A.  "Risk  Factors  -  Risks  Related  to 
Commercialization  of  Our  Marketed  Products,  Product  Candidates,  and  New  Indications  for  Our  Marketed  Products  -  The 
commercial success of our products and product candidates is subject to significant competition."

Marketed Product

Competitor Product

Competitor

EYLEA HD and 
EYLEA

Yesafili® (aflibercept) 
(biosimilar referencing 
EYLEA)

Biocon Biologics Ltd

Lucentis® (ranibizumab 
injection)

Novartis AG and 
Genentech/Roche

Territory(a)

EU

United States, EU, 
Japan

Indication
wAMD, DME, 
macular edema 
following RVO 
(including CRVO 
and BRVO), and 
mCNV
wAMD, DME, 
macular edema 
following RVO 
(including CRVO 
and BRVO), DR, 
mCNV, and ROP

22

Marketed Product 
(continued)
EYLEA HD and 
EYLEA (continued)

Competitor Product
Byooviz™ (ranibizumab-
nuna) (biosimilar 
referencing Lucentis)

Competitor

Samsung Bioepis Co., 
Ltd. and Biogen Inc.

Ximluci® (ranibizumab) 
(biosimilar referencing 
Lucentis)

Xbrane Biopharma AB 
and Bausch + Lomb

Cimerli™ (ranibizumab-
eqrn) (biosimilar 
referencing Lucentis)

Formycon AG, Bioeq AG, 
Coherus BioSciences, 
Inc., and Teva Ltd.

Susvimo® (ranibizumab 
ocular implant) 
Vabysmo™ (faricimab-
svoa)

Genentech/Roche

Genentech/Roche

Avastin® (bevacizumab) 
(off-label and repackaged)

Genentech/Roche

Novartis AG

Allergan/AbbVie Inc.

DME, RVO

Beovu® (brolucizumab) 
Injection
Ozurdex® (dexamethasone 
intravitreal implant) 
Iluvien® (fluocinolone 
acetonide intravitreal 
implant)
Eucrisa®/Staquis® 
(crisaborole)
Opzelura® (ruxolitinib)

Dupixent

Pfizer Inc.

Incyte Corporation

Alimera Sciences, Inc.

DME

United States, EU

Indication
wAMD, DME, 
macular edema 
following RVO 
(including CRVO 
and BRVO), DR, and 
mCNV
wAMD, DME, 
macular edema 
following RVO 
(including CRVO 
and BRVO), DR, and 
CNV
wAMD, DME, 
macular edema 
following RVO 
(including CRVO 
and BRVO), DR, and 
mCNV
wAMD

wAMD, DME, and 
macular edema 
following RVO
wAMD, DME, and 
macular edema 
following RVO
wAMD, DME

Territory(a)
United States, EU

EU

United States, EU

United States

United States, EU, 
Japan

United States, EU, 
Japan

United States, EU, 
Japan
United States, EU

Mild-to-moderate 
atopic dermatitis
Mild-to-moderate 
atopic dermatitis
Moderate-to-severe 
atopic dermatitis
Moderate-to-severe 
atopic dermatitis
Moderate-to-severe 
atopic dermatitis
Moderate-to-severe 
atopic dermatitis
Moderate-to-severe 
atopic dermatitis
Atopic dermatitis

United States, EU

United States

EU, Japan

United States, EU, 
Japan
United States, EU, 
Japan
United States, EU, 
Japan
EU

Japan

Japan

Pruritus associated 
with atopic 
dermatitis
Asthma, nasal polyps United States, EU, 

Japan (asthma); 
United States, EU 
(nasal polyps)

Olumiant® (baricitinib)

Cibinqo® (abrocitinib)

Eli Lilly and Company/
Incyte Corporation
Pfizer

Rinvoq® (upadacitinib)

AbbVie

Adbry™/Adtralza® 
(tralokinumab)
Ebglyss® (lebrikizumab)

Corectim® (delgocitinib)

Mitchga® (nemolizumab)

LEO Pharma Inc.

Almirall S.A.

Japan Tobacco Inc./Torii 
Pharmaceutical Co., Ltd.
Maruho Co., Ltd./Chugai 
Pharmaceutical Co., Ltd.

Xolair® (omalizumab)

Roche/Novartis

23

Marketed Product 
(continued)

Competitor Product
Dupixent (continued) Nucala® (mepolizumab)

Competitor
GlaxoSmithKline 
("GSK")

Indication

Territory(a)

Asthma, nasal polyps United States, EU, 

Libtayo

Cinqair® (reslizumab)
Fasenra® (benralizumab)

Teva
AstraZeneca

Asthma
Asthma

Tezspire™ (tezepelumab-
ekko)
Keytruda® 
(pembrolizumab)
Opdivo® (nivolumab)

AstraZeneca/Amgen

Asthma

Merck & Co., Inc.

Various cancers

Bristol-Myers Squibb

Various cancers

Tecentriq® (atezolizumab)

Roche

Imfinzi® (durvalumab)

AstraZeneca

Various cancers

Various cancers

Bavencio® (avelumab)

Pfizer/Merck KGaA

Various cancers

Jemperli® (dostarlimab)

GSK

Various cancers

Japan (asthma); 
United States, EU 
(nasal polyps)
United States, EU
United States, EU, 
Japan
United States, EU, 
Japan
United States, EU, 
Japan
United States, EU, 
Japan
United States, EU, 
Japan
United States, EU, 
Japan
United States, EU, 
Japan
United States, EU

(a) This table focuses on the United States, EU, and Japan. Certain products have also received marketing approval in countries outside the 
United States, EU, and Japan.

Product Candidates

Our late-stage and earlier-stage clinical candidates (including those being developed in collaboration with our collaborators) face 
competition  from  many  pharmaceutical  and  biotechnology  companies.  For  example,  we  are  aware  of  other  pharmaceutical  and 
biotechnology companies actively engaged in the research and development of antibody-based products against targets that are 
also the targets of our early- and late-stage product candidates. These companies are using various technologies in competition 
with  our  VelocImmune  technology  and  our  other  antibody  generation  technologies,  including  their  own  antibody  generation 
technologies and other approaches such as RNAi, chimeric antigen receptor T cell (CAR-T cell), and gene therapy technologies. 
We  are  also  aware  of  other  companies  developing  or  marketing  small  molecules  that  may  compete  with  our  antibody  product 
candidates in various indications, if such product candidates obtain regulatory approval in those indications.

For  additional  information  regarding  our  product  candidates  (including  those  being  developed  in  collaboration  with  our 
collaborators)  and  the  substantial  competition  they  face,  see  also  Part  I,  Item  1A.  "Risk  Factors  -  Risks  Related  to 
Commercialization  of  Our  Marketed  Products,  Product  Candidates,  and  New  Indications  for  Our  Marketed  Products  -  The 
commercial success of our products and product candidates is subject to significant competition." 

Other Areas

Many  pharmaceutical  and  biotechnology  companies  are  attempting  to  discover  new  therapeutics  for  indications  in  which  we 
invest substantial time and resources. In these and related areas, intellectual property rights have been sought and certain rights 
have been granted to competitors and potential competitors of ours, and we may be at a substantial competitive disadvantage in 
such areas as a result of, among other things, our inferior intellectual property position or lack of experience, trained personnel, 
and  expertise.  A  number  of  corporate  and  academic  competitors  are  involved  in  the  discovery  and  development  of  novel 
therapeutics that are the focus of other research or development programs we are now conducting. Some of these competitors are 
currently  conducting  advanced  preclinical  and  clinical  research  programs  in  these  areas.  These  and  other  competitors  also  may 
have established substantial intellectual property and other competitive advantages.

If any of these or other competitors announces a successful clinical study involving a product that may be competitive with one of 
our product candidates or the grant of marketing approval by a regulatory agency for a competitive product, such developments 
may have an adverse effect on our business, operating results, financial condition, cash flows, or future prospects.

We  also  compete  with  academic  institutions,  governmental  agencies,  and  other  public  or  private  research  organizations,  which 
conduct  research,  seek  patent  and  other  intellectual  property  protection,  and  establish  collaborative  arrangements  for  the 
development  and  marketing  of  products  that  would  provide  royalties  or  other  consideration  for  use  of  their  technology.  These 
institutions are becoming more active in seeking patent and other intellectual property protection and licensing arrangements to 

24

collect  royalties  or  other  consideration  for  use  of  the  technology  they  have  developed.  Products  developed  in  this  manner  may 
compete  directly  with  products  we  develop.  We  also  compete  with  others  in  acquiring  technology  from  these  institutions, 
agencies, and organizations.

Patents, Trademarks, and Trade Secrets

We  rely  on  a  combination  of  intellectual  property  laws,  including  patent,  trademark,  copyright,  trade  secret,  and  domain  name 
protection laws, as well as confidentiality and license agreements, to protect our intellectual property and proprietary rights.

Our success depends, in part, on our ability to obtain patents, maintain trade secret protection, and operate without infringing on 
the  proprietary  rights  of  third  parties  (see  Part  I,  Item  1A.  "Risk  Factors  -  Risks  Related  to  Intellectual  Property  and  Market 
Exclusivity - We may be restricted in our development, manufacturing, and/or commercialization activities by patents or other 
proprietary rights of others, and could be subject to awards of damages if we are found to have infringed such patents or rights"; 
and Note 16 to our Consolidated Financial Statements). Our policy is to file patent applications to protect technology, inventions, 
and  improvements  that  we  consider  important  to  our  business  and  operations.  We  hold  an  ownership  interest  in  a  number  of 
issued  patents  in  the  United  States  and  other  countries  with  respect  to  our  products  and  technologies.  In  addition,  we  hold  an 
ownership interest in thousands of patent applications in the United States and other countries. 

Our patent portfolio includes granted patents and pending patent applications covering our VelociSuite technologies, including our 
VelocImmune mouse platform which produces fully human antibodies. Our issued patents covering these technologies generally 
expire between 2022 and 2032. However, we continue to file patent applications directed to improvements to these technology 
platforms.

Our patent portfolio also includes issued patents and pending applications relating to commercialized products and our product 
candidates in clinical development. These patents cover, among other things, proteins, DNA and RNA molecules, manufacturing 
patents, method of use patents, and pharmaceutical compositions and formulations. 

The  following  table  describes  our  U.S.  patents,  European  patents  ("EP"),  and  Japanese  patents  ("JP")  that  are  of  particular 
relevance  to  key  products  marketed  or  otherwise  commercialized  by  us  and/or  our  collaborators,  including  the  territory,  patent 
number,  general  subject  matter  class,  and  expected  expiration  dates.  The  noted  expiration  dates  include  any  patent  term 
adjustments. Certain of these patents may also be entitled to term extensions. We continue to pursue additional patents and patent 
term extensions in the United States and other jurisdictions covering various aspects of our products that may, if issued, extend 
exclusivity beyond the expiration of the patents listed in the table below. One or more patents with the same or earlier expiry date 
may fall under the same "general subject matter class" for certain products and may not be separately listed. We also own various 
patents  with  claims  relating  to  methods  of  making,  formulating,  and/or  using  the  active  molecules  contained  within  our  key 
products, but that do not cover indications, methods of use or processes currently approved by regulatory agencies or used by us 
and/or our collaborators. Such patents are not listed in the following table.

Product
EYLEA HD

EYLEA(a)

Molecule

Territory

aflibercept (8 mg) US
US
US
US
US
US
US
JP
aflibercept (2 mg) US
US
US
US
US
US
US
US
US

General Subject 
Matter Class

Expiration

June 14, 2027
Formulation
June 14, 2027
Formulation
May 15, 2039
Formulation
Formulation
June 14, 2027
Methods of Treatment May 22, 2032

Patent No.
10,066,458
11,084,865
11,103,552
11,732,024
9,254,338
January 11, 2032
10,130,681 Methods of Treatment
January 11, 2032
10,828,345 Methods of Treatment
May 10, 2039
Formulation
7,235,770
June 21, 2027
Formulation
8,092,803
June 14, 2027
Formulation
11,066,458
June 14, 2027
Formulation
11,084,865
Formulation
June 14, 2027
11,732,024
Methods of Treatment May 22, 2032
9,254,338
9,669,069
Methods of Treatment
10,130,681 Methods of Treatment
10,828,345 Methods of Treatment
10,888,601 Methods of Treatment

January 11, 2032
January 11, 2032
January 11, 2032
January 11, 2032

25

Product 
(continued)

EYLEA(a) 
(continued)

Molecule

Territory

Patent No.
11,253,572 Methods of Treatment

General Subject 
Matter Class

Expiration
January 11, 2032

Dupixent

dupilumab

US

US
US
US
EP

EP
EP
EP

JP

US
US
US
US
US
US
US
US
US
US
US
US
US
US
US
US
US
EP
EP

EP
EP
EP
EP
EP
EP
EP
EP
EP
EP
JP

JP

11,559,564 Methods of Treatment
11,707,506 Methods of Treatment
11,730,794 Methods of Treatment
Composition of Matter 
1183353
(Supplementary 
Protection Certificate)
Formulation
Formulation
Formulation 
(Supplementary 
Protection Certificate)
Formulation

2364691
2944306
2944306

5,216,002

January 11, 2032
January 11, 2032
January 11, 2032
(May 23, 2025)(b)/
(November 23, 2025)(c)

June 14, 2027
June 14, 2027(b)
(May 25, 2028)(b)

February 27, 2028 – 
October 1, 2029(d)
Composition of Matter March 28, 2031(e)
7,608,693
October 17, 2032
Formulation
8,945,559
October 5, 2031
Formulation
9,238,692
October 5, 2031
Formulation
10,435,473
October 5, 2031
Formulation
11,059,896
April 17, 2028
Methods of Treatment
8,075,887
October 2, 2027
Methods of Treatment
8,337,839
July 10, 2034
Methods of Treatment
9,290,574
December 22, 2033
Methods of Treatment
9,574,004
11,421,036 Methods of Treatment
July 10, 2034
10,137,193 Methods of Treatment March 18, 2036
10,485,844 Methods of Treatment
10,059,771 Methods of Treatment
11,214,621 Methods of Treatment March 11, 2036
11,167,004 Methods of Treatment
11,034,768 Methods of Treatment March 23, 2039
11,292,847 Methods of Treatment May 10, 2039
2356151
2356151

September 21, 2037
June 20, 2034

September 21, 2037

Composition of Matter October 27, 2029(b)
Composition of Matter 
(Supplementary 
Protection Certificate)
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Formulation
Formulation
Composition of Matter October 27, 2029 – 
October 27, 2034(d)
October 5, 2031 – 
September 14, 2035(d)

(September 28, 
2032)(b)/(March 28, 
2033)(c)
June 20, 2034
August 20, 2033
October 27, 2029
February 20, 2035
August 20, 2033
July 10, 2034
October 29, 2038
August 20, 2033
October 5, 2031
October 5, 2031

Formulation

3010539
2888281
3064511
3107575
3470432
3019191
3703818
4011915
2624865
3354280
5,291,802

5,918,246

26

Product 
(continued)

Dupixent 
(continued)

Molecule

Territory

Patent No.
6,306,588

General Subject 
Matter Class
Methods of Treatment

Libtayo

cemiplimab

JP

JP
JP
JP

JP
JP
JP
JP
JP
JP
JP
US
US
US
US
US
US
EP
EP
EP
EP
JP

JP

JP

JP
JP
JP
JP

Methods of Treatment
Methods of Treatment
Methods of Treatment

Expiration
August 20, 2033 – 
August 29, 2034(d)
September 4, 2033
February 20, 2035
June 20, 2034 – 
September 2, 2035(d)
November 13, 2035
September 21, 2037
November 13, 2035
August 20, 2033
September 4, 2033
October 29, 2038
February 20, 2035

September 18, 2035

6,353,838
6,673,840
6,463,351

6,861,630
7,164,530
7,216,122
7,216,157
7,256,231
7,315,545
7,343,547

Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Methods of Treatment
Composition of Matter
Composition of Matter April 10, 2035
March 21, 2038
Formulation

9,987,500
10,737,113
11,603,407
10,457,725 Methods of Treatment May 12, 2037
11,292,842 Methods of Treatment
11,505,600 Methods of Treatment
Composition of Matter
Formulation
Methods of Treatment May 12, 2037
Methods of Treatment May 12, 2037
Composition of Matter

3097119
3606504
3455258
3932951
6,425,730

July 18, 2038
July 2, 2038

January 23, 2035
March 23, 2038

January 23, 2035 – 
March 15, 2039(d)
January 23, 2035 – 
August 13, 2037(d)
January 23, 2035 – 
March 9, 2035(d)
March 23, 2038

6,711,883

Composition of Matter

7,174,009

Composition of Matter

7,229,171
6,999,577

7,054,680
7,240,512

Formulation
Methods of Treatment May 12, 2037
Methods of Treatment May 12, 2037
Methods of Treatment May 25, 2041

(a) See Note 16 to our Consolidated Financial Statements for information regarding inter partes review and post-grant review 
petitions filed in the U.S. Patent and Trademark Office and patent infringement proceedings relating to EYLEA.
(b) Supplementary protection certificates ("SPCs") are pending or have been granted in various European countries, extending the 
original patent terms in those countries, where granted, to the applicable dates indicated in parentheses.
(c) SPC term extensions are pending or have been granted in various European countries based on the completion of a pediatric 
investigation program, extending the term of the SPC in those countries, where granted, an additional 6 months to the applicable 
dates indicated in parentheses.
(d) The patent term extension ("PTE") system in Japan allows for a patent to be extended more than once provided the later 
approval is directed to a different indication from that of the previous approval. This may result in multiple PTE approvals for a 
given patent, each with its own expiration date. In this table, date ranges are shown for the expiration of Japanese patents for which 
multiple PTEs have been granted, with the later date indicating the latest expiring PTE for the corresponding patent.
(e) A patent term extension has been granted by the U.S. Patent and Trademark Office, extending the original patent term (October 
2, 2027), insofar as it covers Dupixent, to March 28, 2031.

27

In addition to our patent portfolio, in the United States and certain other countries, our competitive position may be enhanced due 
to the availability of market exclusivity under relevant law (for additional information regarding market exclusivity, see Part I, 
Item 1A. "Risk Factors - Risks Related to Intellectual Property and Market Exclusivity - Loss or limitation of patent rights, and 
regulatory pathways for biosimilar competition, could reduce the duration of market exclusivity for our products"). For example, 
in  the  United  States,  the  regulatory  exclusivity  period  for  EYLEA  (i.e.,  the  period  during  which  no  biosimilar  product  can  be 
approved  by  the  FDA)  extends  through  May  17,  2024  following  the  pediatric  exclusivity  granted  by  the  FDA.  The  effect  of 
expiration of a patent relating to a particular product also depends upon other factors, such as the nature of the market and the 
position  of  the  product  in  it,  the  growth  of  the  market,  the  complexities  and  economics  of  the  process  for  manufacture  of  the 
active  ingredient  of  the  product,  and  the  requirements  of  new  drug  provisions  of  the  Federal  Food,  Drug  and  Cosmetic  Act  or 
similar laws and regulations in other countries.

We  also  are  the  nonexclusive  licensee  of  a  number  of  additional  patents  and  patent  applications.  These  include  a  license 
agreement with Bristol-Myers Squibb, E. R. Squibb & Sons, L.L.C., and Ono Pharmaceutical Co., Ltd. to obtain a license under 
certain  patents  owned  and/or  exclusively  licensed  by  one  or  more  of  these  parties  that  includes  the  right  to  develop  and  sell 
Libtayo.  Under  the  agreement,  we  paid  royalties  of  8.0%  on  worldwide  sales  of  Libtayo  through  December  31,  2023,  and  are 
obligated to pay royalties of 2.5% from January 1, 2024 through December 31, 2026. 

Patent law relating to the patentability and scope of claims in the biotechnology field is evolving and our patent rights are subject 
to this additional uncertainty. The degree of patent protection that will be afforded to our products in the United States and other 
important  commercial  markets  is  uncertain  and  is  dependent  upon  the  scope  of  protection  decided  upon  by  the  patent  offices, 
courts, and governments in these countries. There is no certainty that our existing patents or others, if obtained, will provide us 
protection from competition or provide commercial benefit. 

Others  may  independently  develop  similar  products  or  processes  to  those  developed  by  us,  duplicate  any  of  our  products  or 
processes or, if patents are issued to us, design around any products and processes covered by our patents. We expect to continue, 
when  appropriate,  to  file  product  and  process  applications  with  respect  to  our  inventions.  However,  we  may  not  file  any  such 
applications or, if filed, the patents may not be issued. Patents issued to or licensed by us may be infringed by the products or 
processes of others.

We seek to file and maintain trademarks around the world based on commercial activities in most jurisdictions where we have, or 
desire to have, a business presence for a particular product or service. Trademark protection varies in accordance with local law, 
and continues in some countries as long as the trademark is used and in other countries as long as the trademark is registered. 
Trademark registrations generally are for fixed but renewable terms.

Defense and enforcement of our intellectual property rights is expensive and time consuming, even if the outcome is favorable to 
us. It is possible that patents issued or licensed to us will be successfully challenged, that a court may find that we are infringing 
validly issued patents of third parties, or that we may have to alter or discontinue the development of our products or pay licensing 
fees to take into account patent rights of third parties (see Part I, Item 1A. "Risk Factors - Risks Related to Intellectual Property 
and Market Exclusivity - We may be restricted in our development, manufacturing, and/or commercialization activities by patents 
or other proprietary rights of others, and could be subject to awards of damages if we are found to have infringed such patents or 
rights"; and Note 16 to our Consolidated Financial Statements).

Government Regulation

Regulation by government authorities in the United States and other countries is a significant factor in the research, development, 
manufacture,  and  marketing  of  our  products  and  our  product  candidates.  A  summary  of  the  primary  areas  of  government 
regulation that are relevant to our business is provided below. For a description of material regulatory risks we face, also refer to 
Part I, Item 1A. "Risk Factors."

Preclinical Requirements

The activities required before a product candidate may be marketed in the United States or elsewhere begin with preclinical tests. 
Preclinical tests include laboratory evaluations of, among other things, product chemistry and formulation and toxicological and 
pharmacological studies in animal species to assess the toxicity and dosing of the product candidate. In the United States, certain 
preclinical  trials  must  comply  with  the  FDA's  Good  Laboratory  Practice  requirements  ("GLPs")  and  the  U.S.  Department  of 
Agriculture's Animal Welfare Act. The results of these studies must be submitted to the FDA or the relevant regulatory authority 
outside the United States as part of an IND or other clinical trial application (as applicable), which must be reviewed by the FDA 
or the relevant government authority before proposed clinical testing can begin in the applicable country or jurisdiction. In the 
United  States,  unless  the  FDA  raises  concerns,  the  IND  becomes  effective  30  days  following  its  receipt  by  the  FDA,  and  the 
clinical trial proposed in the IND may begin. The FDA or other regulatory authorities may ask for additional data in order to begin 
a clinical trial. Rules that are equivalent in scope but which vary in application apply in other countries.

28

Product Approval

All of our product candidates require regulatory approval by relevant government authorities before they can be commercialized. 
In  particular,  human  therapeutic  products  are  subject  to  rigorous  preclinical  and  clinical  trials  and  other  pre-market  approval 
requirements by the FDA, European Medicines Agency ("EMA"), and regulatory authorities of other countries. The structure and 
substance of the FDA and other countries' pharmaceutical regulatory practices may evolve over time. The ultimate outcome and 
impact of such developments cannot be predicted.

Clinical trials involve the administration of a drug to healthy human volunteers or to patients under the supervision of a qualified 
investigator.  The  conduct  of  clinical  trials  is  subject  to  extensive  regulation,  including  compliance  with  the  FDA's  bioresearch 
monitoring  regulations  and  Good  Clinical  Practice  requirements  ("GCPs"),  which  establish  standards  for  conducting,  recording 
data from, and reporting the results of, clinical trials, and are intended to assure that the data and reported results are credible and 
accurate,  and  that  the  rights,  safety,  and  well-being  of  study  participants  are  protected.  Clinical  trials  must  be  conducted  under 
protocols that detail the study objectives, parameters for monitoring safety, and the efficacy criteria, if any, to be evaluated. In 
addition,  each  clinical  trial  must  be  reviewed  and  approved  by,  and  conducted  under  the  auspices  of,  an  Institutional  Review 
Board  ("IRB")  for  each  clinical  site  within  the  United  States  or,  where  applicable,  an  Ethics  Committee  and/or  the  competent 
authority  for  clinical  sites  outside  the  United  States.  Companies  sponsoring  the  clinical  trials,  investigators,  and  IRBs/Ethics 
Committees  also  must  comply  with,  as  applicable,  regulations  and  guidelines  for  obtaining  informed  consent  from  the  study 
patients, following the protocol and investigational plan, adequately monitoring the clinical trial, and timely reporting of adverse 
events. Foreign studies conducted under an IND must meet the same requirements that apply to studies being conducted in the 
United States. Data from a foreign study not conducted under an IND may be submitted in support of a BLA if the study was 
conducted  in  accordance  with  GCPs  and  the  FDA  is  able  to  validate  the  data.  The  sponsor  of  a  clinical  trial  or  the  sponsor's 
designated  responsible  party  may  be  required  to  register  certain  information  about  the  trial  and  disclose  certain  results  on 
government or independent registry websites, such as clinicaltrials.gov.

Typically, clinical testing involves a three-phase process, which may overlap or be subdivided in some cases. Phase 1 trials are 
usually  conducted  with  a  small  number  of  healthy  volunteers  to  determine  the  early  safety  profile,  metabolism,  and 
pharmacological actions of the product candidate, the side effects associated with increasing doses, and, if possible, to gain early 
evidence of effectiveness. Although Phase 1 trials are typically conducted in healthy human subjects, in some instances, the trial 
subjects are patients with the targeted disease or condition. Phase 2 clinical trials are conducted with a relatively small sample of 
the intended patient population to provide enough data to evaluate the preliminary safety, tolerability, and efficacy of different 
potential doses of the product candidate. Phase 3 clinical trials are larger trials conducted with patients with the target disease or 
disorder intended to gather additional information about dosage, safety, and effectiveness necessary to evaluate the drug's overall 
risk-benefit  profile.  Phase  3  data  often  form  the  core  basis  on  which  the  FDA  and  comparable  foreign  regulatory  authorities 
evaluate  a  product  candidate's  safety  and  effectiveness  when  considering  the  product  application  for  regulatory  approval.  If 
concerns arise about the safety of the product candidate, the FDA or other regulatory authorities can stop clinical trials by placing 
them on a "clinical hold" pending receipt of additional data, which can result in a delay or termination of a clinical development 
program.  The  sponsoring  company,  the  FDA  or  other  regulatory  authorities,  or  the  IRB  or  Ethics  Committee  and  competent 
authority may suspend or terminate a clinical trial at any time on various grounds, including a finding that the patients are being 
exposed to an unacceptable health risk.

The results of the preclinical and clinical testing of a biologic product candidate are then submitted to the FDA in the form of a 
BLA for evaluation to determine whether the product candidate may be approved for commercial sale under the Public Health 
Service  Act.  When  a  BLA  is  submitted,  the  FDA  makes  an  initial  determination  as  to  whether  the  application  is  sufficiently 
complete  to  be  accepted  for  review.  If  the  application  is  not,  the  FDA  may  refuse  to  accept  the  BLA  for  filing  and  request 
additional  information.  A  refusal  to  file,  which  requires  resubmission  of  the  BLA  with  the  requested  additional  information, 
delays review of the application. If the application is accepted for review, the FDA reviews the application to determine, among 
other things, whether a product is safe and effective for its intended use and whether the manufacturing controls are adequate to 
assure and preserve the product's identity, strength, quality, and purity. 

FDA performance goals generally provide for action on a BLA within 10 months of the 60-day filing date (or within 12 months of 
the BLA submission). That deadline can be extended by FDA under certain circumstances, including by the FDA's requests for 
additional information. The targeted action date can be 6 months after the 60-day filing date (or 8 months after BLA submission) 
for product candidates that are granted priority review designation because they are intended to treat serious or life-threatening 
conditions and demonstrate the potential to address unmet medical needs. The FDA has other programs to expedite development 
and review of product candidates that address serious or life-threatening conditions.

For  some  BLAs,  the  FDA  may  convene  an  advisory  committee  to  seek  insights  and  recommendations  on  issues  relevant  to 
approval  of  the  application.  Although  the  FDA  is  not  bound  by  the  recommendation  of  an  advisory  committee,  the  agency 
considers such recommendations carefully when making decisions. Before approving a new drug or biologic product, the FDA 

29

also requires that the facilities at which the product will be manufactured or advanced through the supply chain be in compliance 
with  current  Good  Manufacturing  Practices,  or  cGMP,  requirements  and  regulations  governing,  among  other  things,  the 
manufacture,  shipment,  and  storage  of  the  product.  The  FDA  will  typically  inspect  such  facilities  for  compliance  with  these 
requirements  and  regulations  prior  to  approving  a  BLA.  The  FDA  also  can  audit  the  sponsor  of  the  BLA  to  determine  if  the 
clinical  studies  were  conducted  in  compliance  with  current  GCPs.  After  review  of  a  BLA,  the  FDA  may  grant  marketing 
approval,  request  additional  information,  or  issue  a  CRL  outlining  the  deficiencies  in  the  submission.  The  CRL  may  require 
additional testing or information, including additional preclinical or clinical data, for the FDA to reconsider the application. Even 
if  such  additional  information  and  data  are  submitted,  the  FDA  may  decide  that  the  BLA  still  does  not  meet  the  standards  for 
approval. Data from clinical trials are not always conclusive and the FDA may interpret data differently than the sponsor. If FDA 
grants  approval,  an  approval  letter  authorizes  commercial  marketing  of  the  product  candidate  with  specific  prescribing 
information for specific indications.

Any  approval  required  by  the  FDA  for  any  of  our  product  candidates  may  not  be  obtained  on  a  timely  basis,  or  at  all.  The 
designation of a clinical trial as being of a particular phase is not necessarily indicative that such a trial will be sufficient to satisfy 
the  parameters  of  a  particular  phase,  and  a  clinical  trial  may  contain  elements  of  more  than  one  phase  notwithstanding  the 
designation of the trial as being of a particular phase. The results of preclinical studies or early-stage clinical trials may not predict 
long-term safety or efficacy of our compounds when they are tested or used more broadly in humans. Additionally, as a condition 
of approval, the FDA may impose restrictions that could affect the commercial prospects of a product and increase our costs, such 
as  a  Risk  Evaluation  and  Mitigation  Strategy  ("REMS")  to  mitigate  certain  specific  safety  risks,  and/or  post-approval 
commitments or requirements to conduct additional clinical trials or non-clinical studies or to conduct surveillance programs to 
monitor the product's effects.

Approval of a product candidate by comparable regulatory authorities in countries outside the United States is generally required 
prior to commencement of marketing of the product in those countries. The approval procedure varies among countries and may 
involve  different  or  additional  testing,  and  the  time  required  to  obtain  such  approval  may  differ  from  that  required  for  FDA 
approval. Approval by a regulatory authority in one jurisdiction does not guarantee approval by comparable regulatory authorities 
in other jurisdictions. In the European Economic Area ("EEA") (which is comprised of 27 Member States of the EU plus Norway, 
Iceland,  and  Liechtenstein),  medicinal  products  can  only  be  commercialized  after  a  related  Marketing  Authorization  has  been 
granted.  Marketing  authorization  for  biologics  must  be  obtained  through  a  centralized  procedure,  which  allows  a  company  to 
submit  a  single  application  to  the  EMA.  If  a  related  positive  opinion  is  provided  by  the  EMA,  the  EC  will  grant  a  centralized 
marketing authorization that is valid in the EEA.

In many jurisdictions, pediatric data or an approved Pediatric Investigation Plan ("PIP"), or a waiver of such studies, is required to 
have been approved by regulatory authorities prior to submission of a marketing application. In some EU countries, we may also 
be required to have an approved PIP before we can begin enrolling pediatric patients in a clinical trial. In the United States, under 
the  Pediatric  Research  Equity  Act  ("PREA"),  certain  applications  for  approval  must  include  an  assessment,  generally  based  on 
clinical  study  data,  of  the  safety  and  effectiveness  of  the  subject  product  in  relevant  pediatric  populations,  unless  a  waiver  or 
deferral is granted. However, a pediatric study plan is not required for orphan products and the timing of the submission is subject 
to negotiation with FDA, but such plan cannot be submitted later than submission of a BLA.

Various  federal,  state,  and  foreign  statutes  and  regulations  also  govern  or  influence  the  research,  manufacture,  safety,  labeling, 
storage,  record  keeping,  marketing,  transport,  and  other  aspects  of  developing  and  commercializing  pharmaceutical  product 
candidates. The lengthy process of seeking these approvals and the compliance with applicable statutes and regulations require the 
expenditure  of  substantial  resources.  Any  failure  by  us  or  our  collaborators  or  licensees  to  obtain,  or  any  delay  in  obtaining, 
regulatory approvals could adversely affect the manufacturing or marketing of our products and our ability to receive product or 
royalty revenue. 

For additional information regarding U.S. and foreign regulatory approval processes and requirements, see Part I, Item 1A. "Risk 
Factors - Risks Related to Maintaining Approval of Our Marketed Products and the Development and Obtaining Approval of Our 
Product Candidates and New Indications for Our Marketed Products - Obtaining and maintaining regulatory approval for drug 
products is costly, time-consuming, and highly uncertain. If we or our collaborators do not maintain regulatory approval for our 
marketed products, and obtain regulatory approval for our product candidates or new indications for our marketed products, we 
will not be able to market or sell them, which would materially and negatively impact our business, prospects, operating results, 
and financial condition."

Post-Approval Regulation

The FDA and comparable regulatory authorities in other jurisdictions may also require us to conduct additional clinical trials or to 
make certain changes related to a product after granting approval of the product. The FDA has the explicit authority to require 
postmarketing studies (also referred to as post-approval or Phase 4 studies) and labeling changes based on new safety information, 
and may impose and enforce a REMS at the time of approval or after the product is on the market. Post-approval modifications to 

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the  drug,  such  as  changes  in  indications,  labeling,  or  manufacturing  processes  or  facilities,  may  require  a  sponsor  to  develop 
additional data or conduct additional preclinical studies or clinical trials, to be submitted in a new or supplemental BLA, which 
would require FDA approval. 

Following  approval,  the  FDA  and  comparable  regulatory  authorities  outside  the  United  States  regulate  the  marketing  and 
promotion  of  our  products,  which  must  comply  with  the  Food,  Drug,  and  Cosmetic  Act  and  applicable  FDA  regulations  and 
standards thereunder and equivalent foreign laws. The review of promotional activities by the FDA and comparable regulatory 
authorities  outside  the  United  States  includes,  but  is  not  limited  to,  healthcare  provider-directed  and  direct-to-consumer 
advertising,  communications  regarding  unapproved  uses,  industry-sponsored  scientific  and  educational  activities,  promotional 
activities involving the Internet, and sales representatives' communications. FDA and comparable foreign regulatory authorities' 
regulations  impose  restrictions  on  manufacturers'  communications  regarding  unapproved  uses,  but  under  certain  conditions 
manufacturers may engage in non-promotional, balanced, scientific communication regarding such use. Failure to comply with 
applicable FDA and comparable foreign regulatory authorities' requirements and restrictions in this area may subject a company 
to adverse publicity and enforcement action by the FDA, the Department of Justice, or the Office of the Inspector General of the 
Department of Health and Human Services, as well as state authorities and comparable regulatory authorities outside the United 
States. This could subject a company to a range of penalties that could have a significant commercial impact, including civil and 
criminal fines and agreements that materially restrict the manner in which a company promotes or distributes a drug. See Part I, 
Item  1A.  "Risk  Factors  -  Other  Regulatory  and  Litigation  Risks  -  Our  business  activities  have  been,  and  may  in  the  future  be, 
challenged  under  U.S.  federal  or  state  and  foreign  healthcare  laws,  which  may  subject  us  to  civil  or  criminal  proceedings, 
investigations, or penalties."

Adverse-event reporting and submission of periodic reports are required following marketing approval. The FDA requires BLA 
holders  to  employ  a  system  for  obtaining  and  reviewing  safety  information,  adverse  events,  and  product  complaints  associated 
with each drug and to submit safety reports to the FDA, with expedited reporting timelines in certain situations. Based on new 
safety  information  after  approval,  the  FDA  can,  among  other  things,  mandate  product  labeling  changes,  require  new  post-
marketing studies, impose or modify a risk evaluation and mitigation strategy for the product, or suspend or withdraw approval of 
the product. We may be subject to audits by the FDA and other regulatory authorities to ensure that we are complying with the 
applicable requirements. Rules that are equivalent in scope but which vary in application apply in countries outside the United 
States in which we conduct clinical trials.

The  holder  of  an  EU  marketing  authorization  for  a  medicinal  product  must  also  comply  with  the  EU's  pharmacovigilance 
legislation. This includes requirements to conduct pharmacovigilance, or the assessment and monitoring of the safety of medicinal 
products.  Marketing  authorization  holders  are  required  to  maintain  a  Pharmacovigilance  System  Master  File  ("PSMF"),  which 
supports  and  documents  the  compliance  of  the  marketing  authorization  holder  with  the  requirements  of  EU  pharmacovigilance 
legislation. Marketing authorization holders are also required to have a Qualified Person for Pharmacovigilance ("QPPV"), who, 
among  other  things,  maintains  the  PSMF.  A  QPPV  must  reside  in  the  EEA  and  must  also  prepare  pharmacovigilance  reports, 
respond  to  potential  requests  from  competent  authorities  concerning  pharmacovigilance  on  a  24  hour  basis,  and  provide 
competent authorities with any other information that may be relevant to the safety of the medicinal product in accordance with 
Good Pharmacovigilance Practices. 

The  EC  can  also  require  marketing  authorization  holders  to  conduct  post-authorization  safety  and/or  efficacy  studies.  A  post-
authorization safety study ("PASS") is a study that is carried out after a medicinal product has been authorized to obtain further 
information on a medicinal product's safety, or to measure the effectiveness of risk-management measures. Such studies may be 
clinical  trials  or  non-interventional  studies.  A  post-authorization  efficacy  study  ("PAES")  is  a  study  that  is  carried  out  for 
complementing available efficacy data in the light of well-reasoned scientific uncertainties on aspects of the evidence of benefits 
that is to be or only can be addressed post-authorization. The EC may, in particular, impose a PASS and/or PAES on marketing 
authorization  holders  when  a  marketing  authorization  is  granted  upon  conditions.  The  EC  may  grant  conditional  marketing 
authorizations in the interest of public health, when there is less comprehensive clinical data available than would be required, if 
the EC considers that the benefit of immediate availability may outweigh the risk that the absence of the required clinical data 
poses.

In addition, we and our third-party suppliers are required to maintain compliance with cGMP, and are subject to inspections by 
the  FDA  or  comparable  regulatory  authorities  in  other  jurisdictions  to  confirm  such  compliance.  Changes  of  suppliers  or 
modifications  of  methods  of  manufacturing  may  require  amending  our  application(s)  to  the  FDA  or  such  comparable  foreign 
regulatory authorities and acceptance of the change by the FDA or such comparable foreign regulatory authorities prior to release 
of product(s). FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting and 
documentation requirements upon us and our third-party suppliers. Prescription drug manufacturers in the U.S. must comply with 
applicable  provisions  of  the  Drug  Supply  Chain  Security  Act  and  provide  and  receive  product  tracing  information,  maintain 
appropriate  licenses,  ensure  they  only  work  with  other  properly  licensed  entities,  and  have  procedures  in  place  to  identify  and 

31

properly handle suspect and illegitimate products. We may also be subject to state regulations related to the manufacturing and 
distribution of our products.

Failure to comply with these laws, regulations, and conditions of product approval may lead the FDA and comparable regulatory 
authorities  in  other  jurisdictions  to  take  regulatory  action  or  seek  sanctions,  including  fines,  issuance  of  warning  letters,  civil 
penalties, injunctions, suspension of manufacturing operations, operating restrictions, withdrawal of FDA approval of a product, 
seizure or recall of products, and criminal prosecution.

Pricing and Reimbursement

Sales in the United States of our marketed products are dependent, in large part, on the availability and extent of reimbursement 
from third-party payors, including private payor healthcare and insurance programs, health maintenance organizations, pharmacy 
benefit  management  companies,  and  government  programs  such  as  Medicare  and  Medicaid.  Sales  of  our  marketed  products  in 
other countries are dependent, in large part, on coverage and reimbursement mechanisms and programs administered by health 
authorities in those countries. See Part I, Item 1A. "Risk Factors - Risks Related to Commercialization of Our Marketed Products, 
Product Candidates, and New Indications for Our Marketed Products - Changes to product reimbursement and coverage policies 
and practices may materially harm our business, prospects, operating results, and financial condition."

We  participate  in,  and  have  certain  price  reporting  obligations  to,  the  Medicaid  Drug  Rebate  program,  state  Medicaid 
supplemental rebate program(s), and other governmental pricing programs. We also have obligations to report the average sales 
price for certain drugs to the Medicare program. Under the Medicaid Drug Rebate program, we are required to pay a rebate to 
each state Medicaid program for our covered outpatient drugs that are dispensed to Medicaid beneficiaries and paid for by a state 
Medicaid program as a condition of having federal funds being made available for our drugs under Medicaid and Part B of the 
Medicare program.

Medicaid  is  a  joint  federal  and  state  program  that  is  administered  by  the  states  for  low-income  and  disabled  beneficiaries. 
Medicaid  rebates  are  based  on  pricing  data  reported  by  us  on  a  monthly  and  quarterly  basis  to  the  Centers  for  Medicare  & 
Medicaid  Services  ("CMS"),  the  federal  agency  that  administers  the  Medicaid  and  Medicare  programs.  These  data  include  the 
average manufacturer price and, in the case of innovator products, the best price for each drug which, in general, represents the 
lowest price available from the manufacturer to any entity in the U.S. in any pricing structure, calculated to include all sales and 
associated rebates, discounts, and other price concessions. The amount of the rebate is adjusted upward if average manufacturer 
price increases more than inflation (measured by reference to the Consumer Price Index - Urban). Until December 31, 2023, the 
rebate was capped at 100 percent of the average manufacturer price, but effective January 1, 2024, this cap on the rebate has been 
removed, and the rebate liability of manufacturers could increase accordingly.

If we become aware that our Medicaid reporting for a prior quarter was incorrect, or has changed as a result of recalculation of the 
pricing  data,  we  are  obligated  to  resubmit  the  corrected  data  for  up  to  three  years  after  those  data  originally  were  due,  which 
revisions could affect our rebate liability for prior quarters. If we fail to pay the required rebate amount or report pricing data on a 
timely basis, we may be subject to civil monetary penalties and/or termination of our Medicaid Drug Rebate program agreement, 
in which case federal payments may not be available under Medicaid or Medicare Part B for our covered outpatient drugs. The 
federal  Patient  Protection  and  Affordable  Care  Act  (the  "PPACA")  made  significant  changes  to  the  Medicaid  Drug  Rebate 
program, and thereafter CMS issued a final regulation to implement the changes to the Medicaid Drug Rebate program under the 
PPACA. CMS has since modified Medicaid Drug Rebate program regulations to, among other things, permit reporting multiple 
best  price  figures  with  regard  to  value-based  purchasing  arrangements  and  provide  definitions  for  "line  extension,"  "new 
formulation," and related terms with the practical effect of expanding the scope of drugs considered to be line extensions.

Medicare is a federal program that is administered by the federal government that covers individuals age 65 and over or that are 
disabled  as  well  as  those  with  certain  health  conditions.  Medicare  Part  B  generally  covers  drugs  that  must  be  administered  by 
physicians or other health care practitioners; are provided in connection with certain durable medical equipment; or are certain 
oral  anti-cancer  drugs  and  certain  oral  immunosuppressive  drugs.  Medicare  Part  B  pays  for  such  drugs  under  a  payment 
methodology based on the average sales price of the drugs. Manufacturers, including us, are required to report average sales price 
information to CMS on a quarterly basis. The manufacturer-submitted information may be used by CMS to calculate Medicare 
payment  rates.  Manufacturers  must  pay  refunds  to  Medicare  for  single-source  drugs  or  biological  products,  or  biosimilar 
biological products, reimbursed under Medicare Part B and packaged in single-dose containers or single-use packages for units of 
discarded drug reimbursed by Medicare Part B in excess of 10 percent of total allowed charges under Medicare Part B for that 
drug.  Manufacturers  that  fail  to  pay  refunds  could  be  subject  to  civil  monetary  penalties.  Further,  the  Inflation  Reduction  Act 
("IRA") has established a Medicare Part B inflation rebate scheme under which, generally speaking, manufacturers owe rebates if 
the average sales price of a Part B drug increases faster than the pace of inflation. Failure to timely pay a Part B inflation rebate is 
subject to a civil monetary penalty. 

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The IRA also created a drug price negotiation program requiring the government to set prices for select high-expenditure drugs 
covered under Medicare Parts B and D. Starting in 2023 and 2026, the government is authorized to select Part D and Part B drugs, 
respectively, for inclusion in the drug price negotiation program, with established prices to go into effect for selected Part D drugs 
in  2026  and  for  selected  Part  B  drugs  in  2028,  in  each  case  absent  certain  disqualifying  events.  Failure  to  comply  with 
requirements under the drug price negotiation program is subject to an excise tax and a civil monetary penalty. This or any other 
legislative  change  could  impact  the  market  conditions  for  our  products.  See  Part  I,  Item  1A.  "Risk  Factors  -  Risks  Related  to 
Commercialization of Our Marketed Products, Product Candidates, and New Indications for Our Marketed Products - Changes to 
product reimbursement and coverage policies and practices may materially harm our business, prospects, operating results, and 
financial condition."

Civil monetary penalties can be applied if we are found to have knowingly submitted any false pricing or other information to the 
government, if we are found to have made a misrepresentation in the reporting of our average sales price, or if we fail to submit 
the  required  data  on  a  timely  basis.  Such  conduct  also  could  be  grounds  for  CMS  to  terminate  our  Medicaid  drug  rebate 
agreement, in which case federal payments may not be available under Medicaid or Medicare Part B for our covered outpatient 
drugs.

Federal law requires that any company that participates in the Medicaid Drug Rebate program also participate in the Public Health 
Service's 340B drug pricing program (the "340B program") in order for federal funds to be available for the manufacturer's drugs 
under  Medicaid  and  Medicare  Part  B.  The  340B  program,  which  is  administered  by  the  Health  Resources  and  Services 
Administration  ("HRSA"),  requires  participating  manufacturers  to  agree  to  charge  statutorily  defined  covered  entities  no  more 
than  the  340B  "ceiling  price"  for  the  manufacturer's  covered  outpatient  drugs.  Covered  entities  include  hospitals  that  serve  a 
disproportionate  share  of  financially  needy  patients,  community  health  clinics,  and  other  entities  that  receive  certain  types  of 
grants  under  the  Public  Health  Service  Act.  The  PPACA  expanded  the  list  of  covered  entities  to  include  certain  free-standing 
cancer hospitals, critical access hospitals, rural referral centers, and sole community hospitals, but exempts "orphan drugs" from 
the ceiling price requirements for these covered entities. The 340B ceiling price is calculated using a statutory formula, which is 
based  on  the  average  manufacturer  price  and  Medicaid  rebate  amount  for  the  covered  outpatient  drug  as  calculated  under  the 
Medicaid Drug Rebate program. In general, products subject to Medicaid price reporting and rebate liability are also subject to the 
340B ceiling price calculation and discount requirement.

HRSA issued a final regulation regarding the calculation of the 340B ceiling price and the imposition of civil monetary penalties 
on  manufacturers  that  knowingly  and  intentionally  overcharge  covered  entities.  If  we  are  found  to  have  knowingly  and 
intentionally charged 340B covered entities more than the statutorily mandated ceiling price, we could be subject to significant 
civil monetary penalties and/or such failure also could be grounds for HRSA to terminate our agreement to participate in the 340B 
program, in which case our covered outpatient drugs would no longer be eligible for federal payment under Medicaid or Medicare 
Part  B.  It  is  currently  unclear  how  HRSA  will  apply  its  enforcement  authority  under  this  regulation.  Moreover,  HRSA  has 
established an administrative dispute resolution ("ADR") process for claims by covered entities that a manufacturer has engaged 
in  overcharging,  and  by  manufacturers  that  a  covered  entity  violated  the  prohibitions  against  diversion  or  duplicate  discounts. 
Such claims are to be resolved through an ADR panel of government officials rendering a decision that could be appealed only in 
federal court. An ADR proceeding could subject us to onerous procedural requirements and could result in additional liability. On 
November  30,  2022,  HRSA  issued  a  notice  of  proposed  rulemaking  that  proposes  several  changes  to  the  ADR  process;  and, 
following the solicitation of public comments, in October 2023 HRSA submitted a final version of the rule to the White House 
Office of Management and Budget for review. HRSA also implemented a price reporting system under which we are required to 
report our 340B ceiling prices to HRSA on a quarterly basis, which then publishes those prices to 340B covered entities.

In order to be eligible to have our products paid for with federal funds under the Medicaid and Medicare Part B programs and 
purchased  by  certain  federal  agencies  and  grantees,  we  participate  in  the  U.S.  Department  of  Veterans  Affairs  ("VA")  Federal 
Supply Schedule ("FSS") pricing program. FSS participation is required for our products to be purchased by the VA, Department 
of  Defense  ("DoD"),  Coast  Guard,  and  Public  Health  Service  ("PHS").  Prices  for  innovator  drugs  purchased  by  the  VA,  DoD, 
Coast Guard, and PHS are subject to a cap (known as the "Federal Ceiling Price") equal to 76% of the annual non-federal average 
manufacturer  price  ("non-FAMP")  minus,  if  applicable,  an  additional  discount.  The  additional  discount  applies  if  non-FAMP 
increases more than inflation (measured by reference to the Consumer Price Index - Urban). We also participate in the Tricare 
Retail  Pharmacy  Program,  under  which  we  pay  quarterly  rebates  to  DoD  for  prescriptions  of  our  innovator  drugs  dispensed  to 
Tricare beneficiaries through Tricare Retail network pharmacies. The governing statute provides for civil monetary penalties for 
failure to provide information timely or for knowing submission of false information to the government.

Medicare Part D provides coverage to enrolled Medicare patients for self-administered drugs (i.e., drugs that are not administered 
by a physician). Medicare Part D is administered by private prescription drug plans approved by the U.S. government and, subject 
to  detailed  program  rules  and  government  oversight,  each  drug  plan  establishes  its  own  Medicare  Part  D  formulary  for 
prescription drug coverage and pricing, which the drug plan may modify from time to time. The prescription drug plans negotiate 
pricing  with  manufacturers  and  pharmacies,  and  may  condition  formulary  placement  on  the  availability  of  manufacturer 

33

discounts. In addition, manufacturers, including us, are required to provide to CMS a 70% discount on brand name prescription 
drugs  utilized  by  Medicare  Part  D  beneficiaries  when  those  beneficiaries  are  in  the  coverage  gap  phase  of  the  Part  D  benefit 
design. The IRA includes a sunset provision with respect to the coverage gap discount program starting in 2025 and replaces it 
with a new manufacturer discount program. In addition, the IRA has established a Medicare Part D inflation rebate scheme under 
which, generally speaking, manufacturers will owe additional rebates if the average manufacturer price of a Part D drug increases 
faster than the pace of inflation. Failure to timely pay a Part D inflation rebate or otherwise comply with obligations under the 
Medicare Part D inflation rebate scheme is subject to a civil monetary penalty.

Private payor healthcare and insurance providers, health maintenance organizations, and pharmacy benefit managers in the United 
States are adopting more aggressive utilization management techniques and are increasingly requiring significant discounts and 
rebates  from  manufacturers  as  a  condition  to  including  products  on  formulary  with  favorable  coverage  and  copayment/
coinsurance. These payors may not cover or adequately reimburse for use of our products or may do so at levels that disadvantage 
them relative to competitive products. 

Outside the United States, within the EU, our products are paid for by a variety of payors, with governments being the primary 
source of payment. Government health authorities in the EU determine or influence reimbursement of products, and set prices or 
otherwise  regulate  pricing.  Negotiating  prices  with  governmental  authorities  can  delay  commercialization  of  our  products. 
Governments  may  use  a  variety  of  cost-containment  measures  to  control  the  cost  of  products,  including  price  cuts,  mandatory 
rebates, value-based pricing, and reference pricing (i.e., referencing prices in other countries or prices of competitive products and 
using those reference prices to set a price). Budgetary pressures in many EU countries are continuing to cause governments to 
consider or implement various cost-containment measures, such as price freezes, increased price cuts and rebates, and expanded 
generic substitution and patient cost-sharing.

Other Regulatory Requirements

We are subject to health care "fraud and abuse" laws, such as the federal civil False Claims Act, the anti-kickback provisions of 
the federal Social Security Act, and other state and federal laws and regulations. Federal and state anti-kickback laws prohibit, 
among other things, payments or other remuneration to induce or reward someone to purchase, prescribe, endorse, or recommend 
a  product  that  is  reimbursed  under  federal  or  state  healthcare  programs.  Federal  false  claims  laws  prohibit  any  person  from 
knowingly  presenting,  or  causing  to  be  presented,  a  false  claim  for  payment  of  government  funds,  or  knowingly  making,  or 
causing  to  be  made,  a  false  statement  to  get  a  false  claim  paid.  See  Part  I,  Item  1A.  "Risk  Factors  -  Other  Regulatory  and 
Litigation Risks - Our business activities have been, and may in the future be, challenged under U.S. federal or state and foreign 
healthcare laws, which may subject us to civil or criminal proceedings, investigations, or penalties."

We  are  subject  to  the  Foreign  Corrupt  Practices  Act,  or  FCPA,  and  similar  anti-bribery  or  anti-corruption  laws,  regulations  or 
rules  of  other  countries  in  which  we  operate,  including  the  U.K.  Bribery  Act.  See  Part  I,  Item  1A.  "Risk  Factors  -  Other 
Regulatory  and  Litigation  Risks  -  Risks  from  the  improper  conduct  of  employees,  agents,  contractors,  or  collaborators  could 
adversely affect our reputation and our business, prospects, operating results, and financial condition."

In the United States, there are numerous federal and state laws and regulations governing data privacy of personal data and the 
collection,  use,  disclosure,  and  protection  of  health  data,  genetic  data,  consumer  data,  and  children's  data.  Such  laws  and 
regulations  include  the  Health  Insurance  Portability  and  Accountability  Act  of  1996  and  its  implementing  regulations 
(collectively, "HIPAA"), as well as state data breach notification laws, state health information and/or genetic privacy laws, and 
federal  and  state  consumer  protection  laws  (such  as  Section  5  of  the  Federal  Trade  Commission  Act  (the  "FTC  Act")  and  the 
California  Consumer  Privacy  Act  (the  "CCPA")).  Many  of  these  laws  differ  from  each  other  in  significant  ways  and  have 
different  effects.  Many  of  the  state  laws  enable  a  state  attorney  general  to  bring  actions  and  provide  private  rights  of  action  to 
consumers as enforcement mechanisms. There is also heightened sensitivity around certain types of health data, which may be 
subject to additional protections. The landscape of federal and state laws regulating personal data is constantly evolving. Failure 
to comply with these laws and regulations could result in government enforcement actions and create liability for us (which could 
include civil and/or criminal penalties), private litigation, and/or adverse publicity. Federal regulators, state attorneys general, and 
plaintiffs' attorneys have been active in this space. 

HIPAA  imposes  privacy  and  security  obligations  on  covered  entity  health  care  providers,  health  plans,  and  health  care 
clearinghouses,  as  well  as  their  "business  associates"  –  certain  persons  or  covered  entities  that  create,  receive,  maintain,  or 
transmit protected health information ("PHI") in connection with providing a specified service or performing a function on behalf 
of a covered entity. Most health care providers, including research institutions from which we or our collaborators obtain clinical 
trial  data,  are  subject  to  HIPAA.  Although  we  are  not  directly  subject  to  HIPAA  other  than  with  respect  to  providing  certain 
employee benefits, we could potentially be subject to criminal penalties if we, our affiliates, or our agents knowingly receive PHI 
maintained by a HIPAA-covered entity in a manner that is not permitted under HIPAA. 

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The Federal Trade Commission ("FTC") also sets expectations for failing to take appropriate steps to keep consumers' personal 
information secure, or failing to provide a level of security commensurate to promises made to individuals about the security of 
their personal information (such as in a privacy notice) may constitute unfair or deceptive acts or practices in violation of Section 
5 of the FTC Act. The FTC expects a company's data security measures to be reasonable and appropriate in light of the sensitivity 
and volume of consumer information it holds, the size and complexity of its business, and the cost of available tools to improve 
security  and  reduce  vulnerabilities.  Individually  identifiable  health  information  is  considered  sensitive  data  that  merit  stronger 
safeguards.  With  respect  to  privacy,  the  FTC  also  sets  expectations  that  companies  honor  the  privacy  promises  made  to 
individuals  about  how  the  company  handles  consumers'  personal  information;  and  any  failure  to  honor  promises,  such  as  the 
statements made in a privacy policy or on a website, may also constitute unfair or deceptive acts or practices in violation of the 
FTC Act. The FTC has the power to enforce promises as it interprets them, and events that we cannot fully control, such as data 
breaches, may result in FTC enforcement. Enforcement by the FTC under the FTC Act can result in civil penalties or enforcement 
actions.

To  the  extent  we  collect  California  resident  personal  data,  we  are  also  subject  to  the  CCPA.  The  CCPA  includes  certain 
transparency  requirements  and  grants  California  residents  several  rights  with  regard  to  their  personal  data.  In  addition,  in 
November  2020,  California  voters  approved  the  California  Privacy  Rights  Act  ("CPRA")  ballot  initiative  which  introduced 
significant amendments to the CCPA and established and funded a dedicated California privacy regulator, the California Privacy 
Protection Agency ("CPPA"). The amendments introduced by the CPRA went into effect on January 1, 2023. Failure to comply 
with such laws may result in, among other things, significant civil penalties and injunctive relief, or statutory or actual damages. 
In  addition,  California  residents  have  the  right  to  bring  a  private  right  of  action  in  connection  with  data  privacy  incidents 
involving certain elements of personal data. These claims may result in significant liability and damages. Similarly, there are a 
number  of  legislative  proposals  in  the  United  States,  at  both  the  federal  and  state  level,  that  could  impose  new  obligations  or 
limitations in the area of consumer protection. Several additional state consumer privacy laws went into effect in 2023 and many 
other  consumer  privacy  laws  are  expected  to  come  into  effect  in  the  near  future  that  have  or  will  impose  new  obligations  or 
limitations in areas affecting our business. We may be subject to fines, penalties, or private actions in the event of non-compliance 
with such laws. 

Outside  the  United  States,  our  clinical  trial  programs,  research  collaborations,  and  other  processing  activities  implicate 
international  data  protection  laws,  including  the  EU  General  Data  Protection  Regulation  2016/679  ("GDPR").  The  GDPR  has 
increased  our  responsibility  and  liability  in  relation  to  the  processing  of  personal  data  of  individuals  located  in  the  EU.  The 
GDPR, together with the national legislation of the EU member states governing the processing of personal data, impose strict 
obligations and restrictions on the ability to collect, analyze, and transfer personal data, including health data and samples from 
clinical  trials  and  adverse  event  reporting.  In  particular,  these  obligations  and  restrictions  may  concern  the  consent  of  the 
individuals to whom the personal data relate, the information provided to the individuals, the sharing of personal data with third 
parties, the transfer of personal data out of the EU, security breach notifications, security and confidentiality of the personal data 
and imposition of substantial potential fines for violations of the data protection obligations. In 2021, the European Commission 
published new standard contractual clauses required to be incorporated into new and existing agreements in order to continue to 
lawfully transfer personal data outside the EU. Different EU member states, as well as the United Kingdom and Switzerland, have 
promulgated  national  privacy  laws  that  impose  additional  requirements,  which  add  to  the  complexity  of  processing  and 
transferring  EU  personal  data.  In  October  2022,  the  United  States  issued  an  executive  order  to  implement  the  EU-U.S.  Data 
Privacy Framework, for which the European Commission adopted an adequacy decision in July 2023 concluding that personal 
data can flow freely from the EU to companies in the United States that participate in the EU-U.S. Data Privacy Framework.

Some  countries  outside  the  EU  have  reacted  to  the  GDPR  by  promulgating  and  enacting  new  privacy  legislation  that  reflects 
similar  principles  and  obligations  on  companies  that  operate  and  process  their  citizens'  personal  data.  Any  failure  or  perceived 
failure  to  comply  with  privacy-related  legal  obligations,  or  any  compromise  of  security  of  personal  data,  may  result  in 
governmental enforcement actions, litigation, contractual indemnity claims, or restraining orders that would impact our ability to 
process and share data globally. As we expand our presence into new countries, we must continue to assess our privacy controls to 
enable  the  processing  of  personal  data.  Guidance  on  implementation  and  compliance  practices  are  often  updated  or  otherwise 
revised. See Part I, Item 1A. "Risk Factors - Other Regulatory and Litigation Risks - We face risks related to the personal data we 
collect, process, and share."

In addition to the foregoing, our present business is, and our future business may be, subject to regulation under the United States 
Atomic  Energy  Act,  the  Clean  Air  Act,  the  Clean  Water  Act,  the  Comprehensive  Environmental  Response,  Compensation  and 
Liability  Act,  the  National  Environmental  Policy  Act,  the  Toxic  Substances  Control  Act,  the  Resource  Conservation  and 
Recovery Act, national restrictions, and other current and potential future local, state, federal, and foreign regulations.

35

Business Segments

We  manage  our  business  as  one  segment  which  includes  all  activities  related  to  the  discovery,  development,  and 
commercialization of medicines for serious diseases. For financial information related to our one segment, see our Consolidated 
Financial Statements and related notes. 

Human Capital Resources

We compete in the highly competitive biotechnology and pharmaceuticals industries. Attracting, developing, and retaining skilled 
and experienced employees in research and development, manufacturing, sales and marketing, and other positions is crucial to our 
ability  to  compete  effectively.  Our  ability  to  recruit  and  retain  such  employees  depends  on  a  number  of  factors,  including  our 
corporate  culture  and  work  environment,  informed  by  our  values  and  behaviors  (which  we  call  The  Regeneron  Way)  and  our 
philosophy of "Doing Well by Doing Good"; talent development and career opportunities; and compensation and benefits.

Integrity is a core value at Regeneron. Both the Company and each of our employees have a responsibility to act ethically and 
with  integrity  at  all  times.  Our  Code  of  Business  Conduct  and  Ethics  brings  together  Regeneron's  key  policy  principles  and 
establishes the Company's expectations for all of our employees to act in accordance with applicable laws, rules, and regulations. 

Employee Profile

As  of  December  31,  2023,  we  had  13,450  full-time  employees,  consisting  of  10,875  employed  in  the  United  States,  1,939 
employed  in  Ireland,  and  636  employed  in  other  countries  (primarily  in  the  United  Kingdom,  Japan,  and  Germany).  Of  these 
employees,  2,393  were  within  our  research  and  preclinical  development  organization,  2,002  were  within  our  global  clinical 
development and regulatory affairs organization, and 6,124 were within our industrial operations and product supply organization. 
Company-wide,  over  1,500  of  our  full-time  employees  hold  a  Ph.D.  and/or  M.D.  We  also  supplement  our  workforce  with 
independent  contractors,  contingent  workers,  and  temporary  workers,  as  needed.  None  of  our  employees  are  represented  by  a 
labor union, and our management considers its relations with our employees to be good.

Diversity, Equity, and Inclusion

Our employees represent a broad range of backgrounds, just like the people who take our medicines, and bring a wide array of 
perspectives  and  experiences  that  have  helped  us  achieve  our  leadership  position  in  the  biotechnology  and  pharmaceuticals 
industries  and  the  global  marketplace.  A  key  component  of  our  culture  is  our  commitment  to  diversity,  equity,  and  inclusion 
("DEI"). We believe this commitment allows us to better drive innovation and achieve our mission to repeatedly bring important 
new medicines to patients with serious diseases. Our strategy is rooted in the understanding that DEI drives better science and that 
better science drives a better world. We believe that by fostering an inclusive culture and bringing diverse voices and perspectives 
to  the  discourse,  we  improve  our  ability  to  fulfill  our  mission.  We  empower  employee-led  cross-functional  resource  groups, 
functional/site-level  DEI  councils,  and  other  interest  groups,  who  connect  around  a  common  passion  to  build  a  culture  of 
inclusion and collaboration. In 2023, we expanded our mentoring program and inclusive leadership workshops for senior leaders 
and new managers, focusing on our diverse talent base to increase leadership skills, connection, and visibility of underrepresented 
talent.

While we are proud of our workforce diversity representation shown in the table below, we seek to continuously improve in this 
area.  In  April  2020,  we  announced  our  2025  global  responsibility  goals,  including  a  commitment  to  increase  diversity  in 
leadership  and  foster  inclusion.  Making  progress  toward  this  goal,  since  then  we  hired  our  Chief  DEI  Officer;  launched  a  DEI 
strategy focused on creating a better workplace, better science, and better world; and implemented a new governance model that 
includes both an executive DEI council and a DEI leadership council. These councils are comprised of senior leaders who provide 
oversight  and  guidance  on  our  DEI  efforts  and  support  the  execution  of  our  DEI  strategy.  In  order  to  better  understand  our 
employees' perspectives, we also measure inclusion and belonging as part of our annual employee engagement survey. Our board 
of directors receives a detailed update on our DEI efforts at least once a year and continues to monitor our progress.

36

2023 Workforce Diversity Representation*

Female Representation (Global)
People of Color Representation (U.S. Only)**

49.9%
30.5%

* Based on full-time employees as of December 31, 2023
** Represents the percentage of our full-time employees in the United States 
that self-identified as belonging to a racial or ethnic minority group. The 
denominator used in this calculation includes employees who did not disclose 
information related to their race or ethnicity. Excluding those that did not 
disclose such information, the percentage shown in this table would be 34.9%.

Externally,  we  support  DEI  efforts  in  our  community,  including  by  supporting  young  scientific  talent  in  underrepresented 
communities.  For  example,  as  part  of  our  $100  million,  10-year  commitment  to  support  the  Regeneron  Science  Talent  Search 
("STS"),  we  allocate  $3.1  million  annually  to  fund  the  Society  for  Science’s  science,  technology,  engineering,  and  math 
("STEM")  outreach  and  equity  programs.  We  have  also  been  the  title  sponsor  of  the  Regeneron  International  Science  and 
Engineering  Fair  ("ISEF")  since  2019  and  recently  announced  an  additional  $34  million,  5-year  commitment.  In  2023,  the 
Together  for  CHANGETM  ("Changing  Healthcare  for  People  of  African  Ancestry  through  InterNational  Genomics  &  Equity") 
initiative was launched by a coalition of Meharry Medical College, the Regeneron Genetics Center, AstraZeneca, Novo Nordisk, 
and Roche to improve health outcomes for people of African ancestry and enhance representation in STEM careers. In addition, 
we  have  developed  a  STEM  pilot  program  with  post-primary-school  and  high-school  students  in  the  New  York  State  Capital 
Region  and  Limerick,  Ireland  that  aspires  to  build  long-term  relationships  with  students  from  disadvantaged  socio-economic 
groups, to encourage and support them in their studies, to inspire them to attend college, and, ultimately, to build a deeper more 
diverse talent pipeline. We also continue to take steps to further integrate diversity considerations into the design and selection of 
sites for our clinical studies to make sure they reflect the diversity of patients with the diseases under investigation.

Employee Wellness, Health, and Safety

The wellbeing of our employees is a primary focus as we believe that the most productive people are those who are at their best, 
both physically and mentally. We provide several programs related to employee health and wellness, including onsite amenities 
and programs such as meditation and prayer rooms and fitness centers. We also prioritize mental health initiatives and have taken 
further action to reduce or remove barriers to quality mental healthcare for our employees and their family members. In addition, 
we provide support for work-life balance through flex-time, remote working arrangements, child and elder care, and paid parental 
leave, among others.

Occupational  health  and  safety  is  critical  to  our  success.  We  are  committed  to  meeting  or  exceeding  all  environmental,  health, 
safety ("EHS") and security regulations and have a range of programs, plans, and procedures to ensure the safety of all people 
who come to work at Regeneron. In addition, our 2025 global responsibility goals include a commitment to focus on workplace 
injury prevention in our drive toward zero incidents.

Employee Growth and Development

We invest significant resources to develop talent with the right capabilities to deliver the growth and innovation needed to support 
our continued success. Our Talent department is dedicated to promoting individual, leader, team, and organizational development 
through a number of tools and services. We offer a variety of professional development courses for our employees and support 
employee continuing education, including through educational reimbursement and tuition forgiveness programs. In addition, we 
continue  to  invest  in  our  current  and  future  leaders  through  a  number  of  leadership  development  courses  and  programs  and 
feedback  and  coaching  opportunities.  In  2023,  over  25%  of  job  openings  were  filled  by  existing  employees  who  were  seeking 
career development opportunities.

Employee Engagement

We believe engaging our employees, from their first day and throughout their career, is key to fostering new ideas and driving 
commitment  and  productivity.  We  communicate  frequently  and  transparently  with  our  employees  through  a  variety  of 
communication  methods,  including  video  and  written  communications,  company  forums  and  summits,  annual  engagement 
surveys, and pulse surveys.

We  are  also  committed  to  fostering  employee  volunteerism  to  reach  our  2025  global  responsibility  goal  of  driving  employee 
volunteer levels above national standards. Employees are encouraged and empowered to support organizations and causes that are 
important to them including through, among other things, our matching gift program, volunteer-time-off policy, and our annual 
company-wide  service  event,  Day  for  Doing  Good.  In  2023,  over  7,300  employees  volunteered  approximately  39,600  hours, 
including approximately 51% of our employees who volunteered nearly 23,600 hours to approximately 230 nonprofits during our 

37

Day  for  Doing  Good.  Additionally,  through  our  Matching  Gift  Program,  we  matched  approximately  $2.4  million  in  employee 
contributions  in  2023,  supporting  nearly  2,000  charities.  In  2023,  we  were  named  to  the  Civic  50  of  most  community-minded 
companies in the United States for the seventh consecutive year.

The success of our employee engagement efforts is demonstrated by our employee retention rate of 93.6% in 2023, as well as the 
fact  that  88%  of  our  employees  who  responded  to  our  annual  engagement  survey  said  Regeneron  is  a  great  place  to  work. 
Additionally, we have placed in the top five for the past 13 years in Science magazine’s annual "Top Employers Survey" of the 
global biotechnology and pharmaceutical industry.

Compensation and Benefits

We are committed to rewarding and supporting our employees in order to continue to attract and retain top talent. We believe this 
commitment  supports  our  core  strategy  of  creating  and  advancing  a  high-quality  product  pipeline  and  delivering  medicines  to 
people in need. Employee engagement, commitment, and achievements are key drivers of pipeline success and therefore our long-
term  performance.  The  primary  underpinning  of  our  pay  philosophy  is  to  award  equity-based  pay  to  all  eligible  employees  to 
ensure that when we deliver for patients and for shareholders, everyone shares in the upside growth. Our practice, therefore, has 
been  to  award  initial  equity  grants  to  all  new  hires,  in  addition  to  our  comprehensive  annual  equity  program.  Total  employee 
compensation  packages  (which  vary  by  country  and  region)  include  market-competitive  pay  (with  the  opportunity  to  receive 
above-market rewards), broad-based grants of equity-based awards, comprehensive healthcare benefits, parental leave, child and 
elder  care  support,  retirement  savings  options,  and  matching  contributions  in  connection  with  employee  savings  plans.  We 
annually  review  our  workforce  demographic  and  pay  equity  data  to  track  our  performance  and  inform  new  initiatives.  Our 
analysis indicates favorable performance in these areas, and we are committed to continued monitoring.

Corporate Information

We were incorporated in the State of New York in 1988 and publicly listed in 1991. Our principal executive offices are located at 
777 Old Saw Mill River Road, Tarrytown, New York 10591, and our telephone number at that address is (914) 847-7000. 

We make available free of charge on or through our Internet website (http://www.regeneron.com) our Annual Report on Form 10-
K,  Quarterly  Reports  on  Form  10-Q,  Current  Reports  on  Form  8-K,  and,  if  applicable,  amendments  to  those  reports  filed  or 
furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, as soon as reasonably practicable after we electronically file 
such material with, or furnish it to, the Securities and Exchange Commission ("SEC"). 

Investors  and  other  interested  parties  should  note  that  we  use  our  media  and  investor  relations  website  (http://
investor.regeneron.com) and our social media channels to publish important information about Regeneron, including information 
that may be deemed material to investors. We encourage investors and other interested parties to review the information we may 
publish through our media and investor relations website and the social media channels listed on our media and investor relations 
website, in addition to our SEC filings, press releases, conference calls, and webcasts.

The information contained on our websites and social media channels is not included as a part of, or incorporated by reference 
into, this report. 

Item 1A. Risk Factors

We operate in an environment that involves a number of significant risks and uncertainties. We caution you to read the following 
risk  factors,  which  have  affected,  and/or  in  the  future  could  affect,  our  business,  prospects,  operating  results,  and  financial 
condition.  The  risks  described  below  include  forward-looking  statements,  and  actual  events  and  our  actual  results  may  differ 
materially  from  these  forward-looking  statements.  Additional  risks  and  uncertainties  not  currently  known  to  us  or  that  we 
currently  deem  immaterial  may  also  impair  our  business,  prospects,  operating  results,  and  financial  condition.  Furthermore, 
additional risks and uncertainties are described under other captions in this report and should also be considered by our investors. 
For  purposes  of  this  section  (as  well  as  this  report  in  general),  references  to  our  products  encompass  products  marketed  or 
otherwise  commercialized  by  us  and/or  our  collaborators  or  licensees;  and  references  to  our  product  candidates  encompass 
product candidates in development by us and/or our collaborators or licensees (in the case of collaborated or licensed products or 
product candidates under the terms of the applicable collaboration or license agreements), unless otherwise stated or required by 
the context. In this section, we first provide a summary of the more significant risks and uncertainties we face and then provide a 
full set of risk factors and discuss them in greater detail.

38

Summary of Risk Factors

As  noted  above,  we  are  subject  to  a  number  of  risks  that  if  realized  could  materially  harm  our  business,  prospects,  operating 
results, and financial condition. Some of the more significant risks and uncertainties we face include those summarized below. 
The summary below is not exhaustive and is qualified by reference to the full set of risk factors set forth in this "Risk Factors" 
section. Please carefully consider all of the information in this Form 10-K, including the full set of risks set forth in this "Risk 
Factors" section, and in our other filings with the SEC before making an investment decision regarding Regeneron.

Commercialization Risks 

• We are substantially dependent on the success of EYLEA, EYLEA HD, and Dupixent. 
•

Sales  of  our  products  are  dependent  on  the  availability  and  extent  of  coverage  and  reimbursement  from  third-party 
payors, including private payors and government programs such as Medicare and Medicaid.
Product  reimbursement  and  coverage  policies  and  practices  could  change  due  to  various  factors  such  as  drug  price 
control  measures  that  have  been  or  may  be  enacted  or  introduced  in  the  United  States  by  various  federal  and  state 
authorities.
The commercial success of our products is subject to significant competition from products or product candidates that 
may be superior to, or more established or cost effective than, our products or product candidates.

•

•

• We and our collaborators on which we rely to commercialize some of our marketed products may be unable to continue 

to successfully commercialize or co-commercialize our products, both in and outside the United States.

Regulatory and Development Risks

•

•

Drug development and obtaining and maintaining regulatory approval for drug products is costly, time-consuming, and 
highly uncertain.
Serious complications or side effects in connection with the use or development of our products or product candidates 
could cause our regulatory approvals to be revoked or limited or lead to delay or discontinuation of development of our 
product candidates or new indications for our marketed products.

• We  may  be  unable  to  formulate  or  manufacture  our  product  candidates  in  a  way  that  is  suitable  for  clinical  or 
commercial use, which would delay or prevent continued development of such candidates and/or receipt of regulatory 
approval or commercial sale.

• Many of our products are intended to be used in combination with drug-delivery devices, which may result in additional 

regulatory, commercialization, and other risks.

Intellectual Property and Market Exclusivity Risks

• We may not be able to protect the confidentiality of our trade secrets, and our patents or other means of defending our 

•

•

intellectual property may be insufficient to protect our proprietary rights.
Patents or proprietary rights of others may restrict our development, manufacturing, and/or commercialization efforts and 
subject us to patent litigation and other proceedings that could find us liable for damages.
Loss  or  limitation  of  patent  rights,  and  regulatory  pathways  for  biosimilar  competition,  could  reduce  the  duration  of 
market exclusivity for our products, including EYLEA and EYLEA HD.

Manufacturing and Supply Risks

•

• We rely on limited internal and contracted manufacturing and supply chain capacity, which could adversely affect our 
ability to commercialize our products and to advance our clinical pipeline. As we increase our production in response to 
higher  product  demand  or  in  anticipation  of  a  potential  regulatory  approval,  our  current  manufacturing  capacity  will 
likely not be sufficient, and our dependence on our collaborators and/or contract manufacturers may increase, to produce 
adequate quantities of drug material for both commercial and clinical purposes.
Expanding our manufacturing capacity and establishing fill/finish capabilities will be costly and we may be unsuccessful 
in  doing  so  in  a  timely  manner,  which  could  delay  or  prevent  the  launch  and  successful  commercialization  of  our 
products approved for marketing and could jeopardize our clinical development programs.
Our ability to manufacture products may be impaired if any of our or our collaborators' manufacturing activities, or the 
activities of other third parties involved in our manufacture and supply chain, are found to infringe patents of others.
If  sales  of  our  marketed  products  do  not  meet  the  levels  currently  expected,  or  if  the  launch  of  any  of  our  product 
candidates  is  delayed  or  unsuccessful,  we  may  face  costs  related  to  excess  inventory  or  unused  capacity  at  our 
manufacturing facilities and at the facilities of third parties or our collaborators.
Third-party  service  or  supply  failures,  failures  at  our  manufacturing  facilities  in  Rensselaer,  New  York  and  Limerick, 
Ireland, or failures at the facilities of any other party participating in the supply chain would adversely affect our ability 
to supply our products.

•

•

•

39

•

Our  or  our  collaborators'  failure  to  meet  the  stringent  requirements  of  governmental  regulation  in  the  manufacture  of 
drug  products  or  product  candidates  could  result  in  incurring  substantial  remedial  costs,  delays  in  the  development  or 
approval  of  our  product  candidates  or  new  indications  for  our  marketed  products  and/or  in  their  commercial  launch  if 
regulatory approval is obtained, and a reduction in sales.

Other Regulatory and Litigation Risks

•

•

•

If the testing or use of our products harms people, or is perceived to harm them even when such harm is unrelated to our 
products, we could be subject to costly and damaging product liability claims.
Our business activities have been, and may in the future be, challenged under U.S. federal or state and foreign healthcare 
laws, which may subject us to civil or criminal proceedings, investigations, or penalties.
If  we  fail  to  comply  with  our  reporting  and  payment  obligations  under  the  Medicaid  Drug  Rebate  program  or  other 
governmental pricing programs, we could be subject to additional reimbursement requirements, penalties, sanctions, and 
fines.

•

• We face risks from the improper conduct of our employees, agents, contractors, or collaborators, including those relating 
to potential non-compliance with relevant laws and regulations such as the Foreign Corrupt Practices Act and the U.K. 
Bribery Act.
Our operations are subject to environmental, health, and safety laws and regulations, including those governing the use 
of hazardous materials.
Changes in laws and regulations affecting the healthcare industry could adversely affect our business.
Tax liabilities and risks associated with our operations outside the United States could adversely affect our business.

•
•
• We face risks related to the personal data we collect, process, and share.

Risks Related to Our Reliance on or Transactions with Third Parties

•

•

If  our  collaborations  with  Sanofi  or  Bayer  or  other  third  parties  are  terminated  or  breached,  our  ability  to  develop, 
manufacture, and commercialize certain of our products and product candidates in the time expected, or at all, may be 
materially harmed.
Our  collaborators  and  service  providers  may  fail  to  perform  adequately  in  their  efforts  to  support  the  development, 
manufacture, and commercialization of our drug candidates and current and future products.

• We  have  undertaken  and  may  in  the  future  undertake  strategic  acquisitions,  and  any  difficulties  from  integrating  such 
acquisitions  or  failure  to  realize  the  expected  benefits  from  such  acquisitions  could  adversely  affect  our  business, 
operating results, and financial condition.

Other Risks Related to Our Business and Our Common Stock

•

•

•

•
•
•

Our business is dependent on our key personnel and will be harmed if we cannot recruit and retain key members of our 
senior management team, including leaders in our research, development, manufacturing, and commercial organizations.
Significant  disruptions  of  information  technology  systems  or  breaches  of  data  security  could  adversely  affect  our 
business.
Public health outbreaks, epidemics, or pandemics (such as the COVID-19 pandemic) have adversely affected and may in 
the future adversely affect our business.
Our indebtedness could adversely impact our business.
Our stock price is extremely volatile.
Our  existing  shareholders  may  be  able  to  exert  substantial  influence  over  matters  requiring  shareholder  approval  and 
over our management.

*       *       *

Risks  Related  to  Commercialization  of  Our  Marketed  Products,  Product  Candidates,  and  New  Indications  for  Our 
Marketed Products

We are substantially dependent on the success of EYLEA, EYLEA HD, and Dupixent.

We are substantially dependent on the success of our ophthalmology portfolio, which consists of EYLEA and, since its August 
2023 FDA approval, EYLEA HD. EYLEA net product sales have historically represented a substantial portion of our revenues, 
and  we  expect  that  there  will  continue  to  be  a  concentration  of  our  net  sales  from  the  net  product  sales  of  EYLEA  HD  and 
EYLEA.  For  the  years  ended  December  31,  2023  and  2022,  our  aggregate  EYLEA  HD  and  EYLEA  net  product  sales  in  the 
United  States  represented  45%  and  51%  of  our  total  revenues,  respectively.  For  the  year  ended  December  31,  2023,  aggregate 
EYLEA HD U.S. and EYLEA U.S. net product sales decreased by 6%, compared to the same period in 2022. If we are successful 
in commercializing EYLEA HD, we expect that our dependence on EYLEA HD will grow relative to our historical dependence 
on EYLEA. If we were to experience difficulty with the commercialization of EYLEA HD or EYLEA in the United States or if 

40

Bayer  were  to  experience  any  difficulty  with  the  commercialization  of  EYLEA  HD  or  EYLEA  outside  the  United  States,  if 
EYLEA net product sales experience a sustained decline in or outside the United States without an offset from EYLEA HD net 
product sales, or if we and Bayer are unable to maintain or obtain marketing approvals of these products (as applicable), we may 
experience a reduction in revenue and may not be able to stay profitable at the levels we previously achieved or at all, and our 
business,  prospects,  operating  results,  and  financial  condition  may  be  materially  harmed.  In  the  United  States,  the  regulatory 
exclusivity period for EYLEA (i.e., the period during which no biosimilar product can be approved by the FDA) will expire after 
May  17,  2024.  See  "Risks  Related  to  Intellectual  Property  and  Market  Exclusivity  -  Loss  or  limitation  of  patent  rights,  and 
regulatory pathways for biosimilar competition, could reduce the duration of market exclusivity for our products" below. As a 
result, we face the risk of lower EYLEA net product sales due to biosimilar competition following such expiration, which may 
have a material adverse impact on our results of operations. The degree to which EYLEA HD net product sales may offset any 
potential decrease in EYLEA net product sales, resulting from the factors discussed above or otherwise, is uncertain. 

In addition, we are substantially dependent on our share of profits from the commercialization of Dupixent under our Antibody 
Collaboration with Sanofi. If we or Sanofi were to experience any difficulty with the commercialization of Dupixent or if we or 
Sanofi  are  unable  to  maintain  current  marketing  approvals  of  Dupixent,  we  may  experience  a  reduction  in  revenue  and  our 
business, prospects, operating results, and financial condition may be materially harmed.

If  we  or  our  collaborators  are  unable  to  continue  to  successfully  commercialize  our  products,  our  business,  prospects, 
operating results, and financial condition will be materially harmed.

We expect that the degree of commercial success of our marketed products will continue to depend on many factors, including the 
following (as applicable):

•

•

•

•

•

•

effectiveness of the commercial strategy in and outside the United States for the marketing of our products, including 
pricing strategy;
sufficient  coverage  of,  and  reimbursement  for,  our  marketed  products  by  third-party  payors,  including  Medicare  and 
Medicaid in the United States and other government and private payors in the United States and foreign jurisdictions, as 
well as U.S. and foreign payor restrictions on eligible patient populations and the reimbursement process (including drug 
price control measures that have been or may be enacted or introduced in the United States by various federal and state 
authorities);
our ability and our collaborators' ability to maintain sales of our marketed products in the face of competitive products 
and  to  differentiate  our  marketed  products  from  competitive  products,  including  as  applicable  product  candidates 
currently in clinical development; and, in the case of EYLEA and EYLEA HD, the existing and potential new branded 
and biosimilar competition (discussed further under "The commercial success of our products and product candidates is 
subject to significant competition - Marketed Products" below) and the willingness of retinal specialists and patients to 
start or continue treatment with such products or to switch from a competitive product to one of our products;
the safety and efficacy of our marketed products (particularly those launched recently, such as EYLEA HD) seen in a 
broader patient group (i.e., real-world use); 
the effect of existing and new health care laws and regulations currently being considered or implemented in the United 
States  and  globally,  including  measures  requiring  the  U.S.  government  in  the  future  to  negotiate  the  prices  of  certain 
drugs and price reporting and other disclosure requirements and the potential impact of such requirements on physician 
prescribing practices and payor coverage;
serious  complications  or  side  effects  in  connection  with  the  use  of  our  marketed  products,  as  discussed  under  "Risks 
Related  to  Maintaining  Approval  of  Our  Marketed  Products  and  the  Development  and  Obtaining  Approval  of  Our 
Product Candidates and New Indications for Our Marketed Products - Serious complications or side effects in connection 
with  the  use  of  our  products  and  in  clinical  trials  for  our  product  candidates  and  new  indications  for  our  marketed 
products  could  cause  our  regulatory  approvals  to  be  revoked  or  limited  or  lead  to  delay  or  discontinuation  of 
development of our product candidates or new indications for our marketed products, which could severely harm our 
business, prospects, operating results, and financial condition" below;

• maintaining and successfully monitoring commercial manufacturing arrangements for our marketed products with third 
parties who perform fill/finish or other steps in the manufacture of such products to ensure that they meet our standards 
and  those  of  regulatory  authorities,  including  the  FDA,  which  extensively  regulate  and  monitor  pharmaceutical 
manufacturing facilities;

41

•
•

•

•

our ability to meet the demand for commercial supplies of our marketed products;
the  outcome  of  the  pending  proceedings  relating  to  EYLEA  and  REGEN-COV  (described  further  in  Note  16  to  our 
Consolidated Financial Statements included in this report), as well as other risks relating to our marketed products and 
product candidates associated with intellectual property of other parties and pending or future litigation relating thereto 
(as discussed under "Risks Related to Intellectual Property and Market Exclusivity" below);
the  outcome  of  the  pending  government  proceedings  and  investigations  and  other  matters  described  in  Note  16  to  our 
Consolidated Financial Statements included in this report (including the civil complaint filed against us on June 24, 2020 
in  the  U.S.  District  Court  for  the  District  of  Massachusetts  by  the  U.S.  Attorney's  Office  for  the  District  of 
Massachusetts); and
the results of post-approval studies, whether conducted by us or by others and whether mandated by regulatory agencies 
or voluntary, and studies of other products that could implicate an entire class of products or are perceived to do so.

More detailed information about the risks related to the commercialization of our marketed products is provided in the risk factors 
below.

We and our collaborators are subject to significant ongoing regulatory obligations and oversight with respect to the products 
we  or  our  collaborators  commercialize.  If  we  or  our  collaborators  fail  to  maintain  regulatory  compliance  for  any  of  such 
products,  the  applicable  marketing  approval  may  be  withdrawn,  which  would  materially  harm  our  business,  prospects, 
operating results, and financial condition.

We and our collaborators are subject to significant ongoing regulatory obligations and oversight with respect to the products we or 
they commercialize for the products' currently approved indications in the United States, EU, Japan, and other countries where 
such products are approved. If we or our collaborators fail to maintain regulatory compliance or satisfy other obligations for such 
products' currently approved indications (including because the product does not meet the relevant endpoints of any required post-
approval studies (such as those required under an accelerated approval by the FDA or other similar type of approval), or for any of 
the reasons discussed below under "Risks Related to Maintaining Approval of Our Marketed Products and the Development and 
Obtaining  Approval  of  Our  Product  Candidates  and  New  Indications  for  Our  Marketed  Products  -  Obtaining  and  maintaining 
regulatory approval for drug products is costly, time-consuming, and highly uncertain. If we or our collaborators do not maintain 
regulatory approval for our marketed products, and obtain regulatory approval for our product candidates or new indications for 
our marketed products, we will not be able to market or sell them, which would materially and negatively impact our business, 
prospects,  operating  results,  and  financial  condition."),  the  applicable  marketing  approval  may  be  withdrawn,  which  would 
materially  harm  our  business,  prospects,  operating  results,  and  financial  condition.  Failure  to  comply  may  also  subject  us  to 
sanctions,  product  recalls,  or  withdrawals  of  previously  approved  marketing  applications.  See  also  "Risks  Related  to 
Manufacturing and Supply - Our or our collaborators' failure to meet the stringent requirements of governmental regulation in 
the  manufacture  of  drug  products  or  product  candidates  could  result  in  incurring  substantial  remedial  costs,  delays  in  the 
development  or  approval  of  our  product  candidates  or  new  indications  for  our  marketed  products  and/or  in  their  commercial 
launch if regulatory approval is obtained, and a reduction in sales" below.

Sales of our marketed products are dependent on the availability and extent of coverage and reimbursement from third-party 
payors.

Sales of our marketed products in the United States are dependent, in large part, on the availability and extent of reimbursement 
from third-party payors, including private payor healthcare and insurance programs, health maintenance organizations, pharmacy 
benefit  management  companies  ("PBMs"),  and  government  programs  such  as  Medicare  and  Medicaid.  Sales  of  our  marketed 
products in other countries are also dependent, in large part, on complex coverage and reimbursement mechanisms and programs 
in those countries. 

Our future revenues and profitability will be adversely affected in a material manner if such third-party payors do not adequately 
defray or reimburse the cost of our marketed products. If these entities do not provide coverage and reimbursement with respect to 
our marketed products or provide an insufficient level of coverage and reimbursement, such products may be too costly for many 
patients to afford them, and physicians may not prescribe them. Many third-party payors cover only selected drugs, or may prefer 
selected drugs, making drugs that are not covered or preferred by such payors more expensive for patients. Third-party payors 
may also require prior authorization for reimbursement, or require failure on another type of treatment before covering a particular 
drug, particularly with respect to higher-priced drugs. As our currently marketed products and most of our product candidates are 
biologics, bringing them to market may cost more than bringing traditional, small-molecule drugs to market due to the complexity 
associated with the research, development, production, supply, and regulatory review of such products. Given cost sensitivities in 
many health care systems, our currently marketed products and product candidates are likely to be subject to continued pricing 
pressures, which may have an adverse impact on our business, prospects, operating results, and financial condition.

In  addition,  in  order  for  private  insurance  and  governmental  payors  (such  as  Medicare  and  Medicaid  in  the  United  States)  to 
reimburse the cost of our marketed products, we must maintain, among other things, our FDA registration and our National Drug 

42

Code, formulary approval by PBMs, and recognition by insurance companies and CMS. There is no certainty that we will be able 
to obtain or maintain the applicable requirements for reimbursement (including relevant formulary coverage, as discussed further 
below) of our current and future marketed products, which may have a material adverse effect on our business.

In  addition,  PBMs  and  other  managed-care  organizations  often  develop  formularies  to  reduce  their  cost  for  medications.  The 
breadth  of  the  products  covered  by  formularies  varies  considerably  from  one  PBM  to  another.  Failure  to  be  included  in  such 
formularies  or  to  achieve  favorable  formulary  status  may  negatively  impact  the  utilization  and  market  share  of  our  marketed 
products. If our marketed products are not included within an adequate number of formularies, adequate reimbursement levels are 
not provided, the eligible insured patient population for our products is limited, or a key payor refuses to provide reimbursement 
for  our  products  in  a  particular  jurisdiction  altogether,  this  could  have  a  material  adverse  effect  on  our  and  our  collaborators' 
ability to commercialize the applicable product.

In many countries outside the United States, pricing, coverage, and level of reimbursement of prescription drugs are subject to 
governmental control, and we and our collaborators may be unable to obtain coverage, pricing, and/or reimbursement on terms 
that  are  favorable  to  us  or  necessary  for  us  or  our  collaborators  to  successfully  commercialize  our  marketed  products  in  those 
countries. In some of these countries, the proposed pricing for a drug must be approved before it may be lawfully marketed. The 
requirements  governing  drug  pricing  and  reimbursement  vary  widely  from  country  to  country,  and  may  take  into  account  the 
clinical  effectiveness,  cost,  and  service  impact  of  existing,  new,  and  emerging  drugs  and  treatments.  For  example,  the  EU 
provides options for its member states to restrict the range of medicinal products for which their national health insurance systems 
provide reimbursement and to control the prices of medicinal products for human use. A member state may approve a specific 
price for the medicinal product or it may instead adopt a system of direct or indirect controls on the profitability of the company 
placing the medicinal product on the market. Our results of operations may suffer if we or our collaborators are unable to market 
our products in countries outside the United States or if coverage and reimbursement for our marketed products in such countries 
is limited or delayed. As discussed below under "If we are unable to establish commercial capabilities outside the United States 
for  Libtayo,  Dupixent,  and  any  other  products  we  intend  to  commercialize  or  co-commercialize  outside  the  United  States,  our 
business, prospects, operating results, and financial condition may be adversely affected," we will need to manage these and other 
commercialization-related  risks  in  order  for  us  to  successfully  develop  commercial  capabilities  outside  the  United  States 
(including  those  necessary  for  our  successful  commercialization  and  co-commercialization  of  Libtayo  and  Dupixent, 
respectively).

Changes  to  product  reimbursement  and  coverage  policies  and  practices  may  materially  harm  our  business,  prospects, 
operating results, and financial condition.

Government  and  other  third-party  payors  (including  PBMs)  are  challenging  the  prices  charged  for  healthcare  products  and 
increasingly  limiting,  and  attempting  to  limit,  both  coverage  and  level  of  reimbursement  for  prescription  drugs,  such  as  by 
requiring  outcomes-based  or  other  pay-for-performance  pricing  arrangements.  They  are  also  imposing  restrictions  on  eligible 
patient  populations  and  the  reimbursement  process,  including  by  means  of  required  prior  authorizations  and  utilization 
management criteria, such as step therapy (i.e., requiring the use of less costly medications before more costly medications are 
approved  for  coverage).  Private  payor  healthcare  and  insurance  providers,  health  maintenance  organizations,  and  PBMs  are 
increasingly  requiring  significant  discounts  and  rebates  from  manufacturers  as  a  condition  to  including  products  on  formulary 
with favorable coverage and copayment/coinsurance. Some states have also enacted or are considering legislation to control the 
prices  and  reimbursement  of  prescription  drugs,  and  state  Medicaid  programs  are  increasingly  requesting  manufacturers  to  pay 
supplemental  rebates  and  requiring  prior  authorization  by  the  state  program  for  use  of  any  prescription  drug  for  which 
supplemental rebates are not being paid. It is likely that federal and state legislatures and health agencies will continue to focus on 
additional health care reform measures in the future that will impose additional constraints on prices and reimbursements for our 
marketed products.

Further,  there  have  been  several  recent  U.S.  Congressional  inquiries  and  recently  approved  or  proposed  federal  and  state 
legislation,  regulations,  and  policies  (in  addition  to  those  already  in  effect)  designed  to,  among  other  things,  bring  more 
transparency to drug pricing, review the relationship between pricing and manufacturer patient programs, reduce the out-of-pocket 
cost of prescription drugs, and reform government program reimbursement methodologies for drugs. Notably, in 2022 the U.S. 
Congress passed the IRA, which includes, among other items, provisions regarding the following:

•

Implementation of a Medicare Drug Price Negotiation Program (the "Medicare Drug Price Negotiation Program").  The 
Medicare  Drug  Price  Negotiation  Program  requires  the  government  to  set  prices  for  select  high-expenditure  drugs 
covered under Medicare Parts B and D. Starting in 2023 and 2026, the government is authorized to select Part D and Part 
B drugs, respectively, for inclusion in the Medicare Drug Price Negotiation Program, with established prices to go into 
effect for selected Part D drugs in 2026 and for selected Part B drugs in 2028, in each case absent certain disqualifying 
events. 

43

• Medicare  Inflation  Based  Rebates.    The  IRA  includes  measures  requiring  manufacturers  to  pay  rebates  where  the 
average sales price or average manufacturer price of drugs covered under Medicare Parts B and D, respectively, exceeds 
the rate of inflation. 

• Medicare Part D Program Redesign.  The IRA implements changes to the Medicare Part D benefits to limit patient out-
of-pocket  drug  costs  and  shift  program  liabilities  from  patients  to  other  stakeholders,  including  health  plans, 
manufacturers, and the government.

While enacted into law, it is currently unclear the extent to which the policy changes will ultimately impact reimbursement levels 
of  our  marketed  products,  including  those  covered  under  Medicare  Part  B  (such  as  EYLEA  and  EYLEA  HD)  or  our  product 
candidates that may be covered under Medicare Part B or Medicare Part D in the future. 

At the state level, legislatures are becoming increasingly aggressive in passing legislation and implementing regulations designed 
to  control  pharmaceutical  and  biological  product  pricing,  including  price  or  patient  reimbursement  constraints,  discounts, 
restrictions on certain product access, and price and marketing cost disclosure and transparency measures. In some cases, these 
measures  are  designed  to  encourage  importation  from  other  countries  and  bulk  purchasing.  A  reduction  in  the  availability  or 
extent  of  reimbursement  from  U.S.  government  programs  (including  as  a  result  of  the  legislation,  proposals,  initiatives,  and 
developments described above) could have a material adverse effect on the sales of EYLEA, EYLEA HD, or our other marketed 
products. Economic pressure on state budgets may also have a similar impact. 

The commercial success of our products and product candidates is subject to significant competition.

Marketed Products

There  is  substantial  competition  in  the  biotechnology  and  pharmaceutical  industries  from  biotechnology,  pharmaceutical,  and 
chemical companies. Many of our competitors have substantially greater research, preclinical and clinical product development 
and manufacturing capabilities, as well as financial, marketing, and human resources, than we do. Our competitors, regardless of 
their  size,  may  also  enhance  their  competitive  position  if  they  acquire  or  discover  patentable  inventions,  form  collaborative 
arrangements,  or  merge  with  other  pharmaceutical  or  biotechnology  companies.  There  is  significant  actual  and  potential  future 
competition for each of our marketed products.  

EYLEA and EYLEA HD.  EYLEA and EYLEA HD face significant competition in the marketplace. For example, each of EYLEA 
and  EYLEA  HD  competes  in  one  or  more  of  its  approved  indications  with  other  VEGF  inhibitors.  These  include  Genentech/
Roche's  Vabysmo®  (faricimab-svoa)  and  Susvimo®  (ranibizumab  ocular  implant);  Novartis  and  Genentech/Roche's  Lucentis® 
(ranibizumab); Novartis' Beovu® (brolucizumab); biosimilar versions of Lucentis commercialized in the United States by Biogen 
Inc.  and  Coherus  BioSciences,  Inc.;  and  Biocon  Biologics  Ltd's  biosimilar  version  of  EYLEA  recently  approved  in  the  EU. 
Ophthalmologists  are  also  using  off-label,  third-party  repackaged  versions  of  Genentech/Roche's  approved  VEGF  antagonist, 
bevacizumab,  for  the  treatment  of  certain  of  EYLEA's  and  EYLEA  HD's  respective  indications,  and  we  are  aware  of  another 
company developing an ophthalmic formulation of such product. In DME (and, in the case of EYLEA, also RVO), EYLEA and 
EYLEA HD also compete with intravitreal implants of corticosteroids. We are also aware of a number of companies working on 
the development of product candidates and extended delivery devices for the potential treatment of one or more of EYLEA's and 
EYLEA  HD's  respective  indications,  including  those  that  act  by  blocking  VEGF  and  VEGF  receptors  (including  therapies 
designed to extend the treatment interval) and/or other targets. In addition, we are aware of several other companies developing 
biosimilar versions of EYLEA and other approved anti-VEGF treatments. Other potentially competitive products in development 
include  products  for  use  in  combination  with  EYLEA  and/or  other  anti-VEGF  treatments,  small-molecule  tyrosine  kinase 
inhibitors,  gene  therapies,  and  other  eye-drop  formulations,  devices,  and  oral  therapies.  There  also  is  a  risk  that  third  parties 
repackage  ZALTRAP  for  off-label  use  and  sale  for  the  treatment  of  diseases  of  the  eye,  even  though  ZALTRAP  has  not  been 
manufactured and formulated for use in intravitreal injections. We are aware of claims by third parties, including those based on 
published clinical data, alleging that ZALTRAP may be safely administered to the eye. 

EYLEA  HD  was  approved  by  the  FDA  in  August  2023  for  the  treatment  of  wAMD,  DME,  and  DR.  As  a  newly  approved 
product, EYLEA HD has entered the highly competitive environment described above. Our success in commercializing EYLEA 
HD will depend on a number of factors, including the degree of success and relative timing of our commercial launch and uptake 
efforts as compared to those of relevant competition, the extent to which we and our collaborators are able to differentiate EYLEA 
HD from competitive products, the safety and efficacy of EYLEA HD seen in a broader patient group (i.e., real-world use), the 
extent of payor coverage and reimbursement, and the applicability of any restrictions imposed by payors, such as step therapy. 

Dupixent.  The market for Dupixent's current and potential future indications is also increasingly competitive. In atopic dermatitis, 
there are topical and systemic JAK inhibitors and antibodies against IL-13 approved for atopic dermatitis. In addition, a number of 
companies  are  developing  antibodies  against  IL-4Ra,  IL-13Ra1,  OX40(L),  and/or  IL-31R  that  may  compete  with  Dupixent  in 
atopic  dermatitis  and  other  indications  (including  asthma  and/or  prurigo  nodularis),  as  applicable.  In  asthma,  competitors  to 
Dupixent  include  antibodies  against  the  IL-5  ligand  or  the  IL-5  receptor,  immunoglobulin  E,  or  thymic  stromal  lymphopoietin 

44

("TSLP"); and some of these antibodies are either approved or in development for indications that also compete or may compete 
in the future with Dupixent in CRSwNP and EoE. There are several other potentially competitive products in development that 
may  compete  with  Dupixent  in  asthma,  as  well  as  potential  future  indications,  including  antibodies  against  the  IL-33  ligand. 
Dupixent also faces competition from inhaled products in asthma and potential future indications.

Libtayo.    Libtayo  also  faces  significant  competition.  There  are  several  competitors  that  are  marketing  and/or  developing 
antibodies  against  PD-1  and/or  PDL-1  (some  of  which  were  approved  in  the  relevant  indications  and  commercialized  before 
Libtayo),  including  Merck's  Keytruda®  (pembrolizumab),  Bristol-Myers  Squibb's  Opdivo®  (nivolumab),  Roche's  Tecentriq® 
(atezolizumab), and AstraZeneca's Imfinzi® (durvalumab).

Other  marketed  products.    There  is  also  significant  actual  and  potential  future  competition  for  other  products  marketed  or 
otherwise commercialized by us and/or our collaborators under our collaboration agreements with them. For example, there are 
several companies that are marketing and/or developing antibodies or other molecules (such as small interfering RNA molecules, 
or siRNAs) against PCSK9, ANGPTL3 and IL-6 and/or IL-6R, which currently (or, for product candidates in development, may 
in the future if approved) compete with Praluent, Evkeeza, and Kevzara, respectively.

Product Candidates

Our VelocImmune® technology, other antibody generation technologies, and late-stage and earlier-stage clinical candidates face 
competition from many pharmaceutical and biotechnology companies using various technologies, including antibody generation 
technologies and other approaches such as RNAi, chimeric antigen receptor T cell (CAR-T cell), and gene therapy technologies. 
For  example,  we  are  aware  of  other  pharmaceutical  and  biotechnology  companies  actively  engaged  in  the  research  and 
development of antibody-based products against targets that are also the targets of our early- and late-stage product candidates. 
We are also aware of other companies developing or marketing small molecules or other treatments that may compete with our 
antibody-based  product  candidates  in  various  indications,  if  such  product  candidates  obtain  regulatory  approval  in  those 
indications. If any of these or other competitors announces a successful clinical study involving a product that may be competitive 
with  one  of  our  product  candidates  or  the  grant  of  marketing  approval  by  a  regulatory  agency  for  a  competitive  product,  such 
developments may have an adverse effect on our business or future prospects. In addition, the first product to reach the market in 
a therapeutic area is often at a significant competitive advantage relative to later entrants to the market. Accordingly, the relative 
speed  with  which  we,  or  our  collaborators,  can  develop  our  product  candidates,  complete  the  clinical  trials  and  approval 
processes,  and,  if  such  product  candidates  are  approved  for  marketing  and  sale,  supply  commercial  quantities  to  the  market  is 
expected to continue to be an important competitive factor. Due to the uncertainties associated with developing biopharmaceutical 
products,  we  may  not  be  the  first  to  obtain  marketing  approval  for  a  product  against  any  particular  target,  which  may  have  a 
material adverse effect on our business or future prospects.

We rely on our collaborations with Bayer and Sanofi for commercializing some of our marketed products.

While we have established our own sales and marketing organization for EYLEA HD and EYLEA in the United States for its 
currently approved indications, we have no sales, marketing, commercial, or distribution capabilities for EYLEA HD or EYLEA 
outside the United States. Under the terms of our license and collaboration agreement with Bayer (which is terminable by Bayer at 
any time upon six or twelve months' advance notice, depending on the circumstances giving rise to termination), we rely on Bayer 
(and,  in  Japan,  Santen  pursuant  to  a  Co-Promotion  and  Distribution  Agreement  with  Bayer's  Japanese  affiliate)  for  sales, 
marketing, and distribution of EYLEA HD and EYLEA outside the United States.

In addition, under the terms of our Antibody Collaboration, we and Sanofi co-commercialize Dupixent in the United States and, 
as  further  discussed  below,  certain  jurisdictions  outside  the  United  States.  As  a  result,  we  rely  in  part  on  Sanofi's  sales  and 
marketing  organization  for  Dupixent.  If  we  and  Sanofi  fail  to  coordinate  our  sales  and  marketing  efforts  effectively,  sales  of 
Dupixent  may  be  materially  affected.  Sanofi  also  maintains  other  important  responsibilities  relating  to  Dupixent.  For  example, 
Sanofi records product sales for Dupixent in the United States and leads negotiations with payors relating to this product. We also 
rely on Sanofi for sales, marketing, and distribution of Dupixent in many countries outside the United States. While we exercised 
our option under the Antibody Collaboration to co-commercialize Dupixent in certain jurisdictions outside the United States, we 
will continue to rely in considerable part on Sanofi's sales and marketing organization in such jurisdictions.

If we and our collaborators are unsuccessful in continuing to commercialize the marketed products subject to such collaborations, 
or  if  Bayer  or  Sanofi  terminate  their  respective  collaborations  with  us,  our  business,  prospects,  operating  results,  and  financial 
condition  would  be  materially  impaired.  While  we  have  some  commercial  presence  outside  the  United  States,  our  commercial 
capabilities  outside  the  United  States  are  still  limited  and  would  need  to  be  further  developed  or  outsourced.  Therefore, 
termination of the Bayer collaboration agreement or our Antibody Collaboration would create substantial new and additional risks 
to the successful commercialization of the applicable products, particularly outside the United States. For additional information 
regarding our collaborations with Bayer and Sanofi, see "Risks Related to Our Reliance on or Transactions with Third Parties - If 
our collaboration with Bayer for EYLEA HD and EYLEA is terminated, or Bayer materially breaches its obligations thereunder, 

45

our business, prospects, operating results, and financial condition, and our ability to continue to commercialize EYLEA HD and 
EYLEA outside the United States would be materially harmed" below and "Risks Related to Our Reliance on or Transactions with 
Third Parties - If our Antibody Collaboration with Sanofi is terminated, or Sanofi materially breaches its obligations thereunder, 
our business, prospects, operating results, and financial condition, and our ability to develop, manufacture, and commercialize 
certain of our products and product candidates in the time expected, or at all, may be materially harmed" below.

Sales of our marketed products recorded by us and our collaborators could be reduced by imports from countries where such 
products may be available at lower prices.

Our sales of products we commercialize in the United States and our collaborators' sales of products they commercialize or co-
commercialize with us under our collaboration agreements with them in the United States and other countries (which impact our 
share  of  any  profits  or  losses  from  the  commercialization  of  these  products  under  the  relevant  collaboration  agreements  and, 
therefore, our results of operations) may be reduced if the applicable product is imported into those countries from lower priced 
markets, whether legally or illegally (a practice known as parallel trading or reimportation). Parallel traders (who may repackage 
or otherwise alter the original product or sell it through alternative channels such as mail order or the Internet) take advantage of 
the price differentials between markets arising from factors including sales costs, market conditions (such as intermediate trading 
stages), tax rates, or national regulation of prices. Under our arrangement with Bayer, pricing and reimbursement for EYLEA HD 
and  EYLEA  outside  the  United  States  is  the  responsibility  of  Bayer.  Similarly,  under  our  Antibody  Collaboration  with  Sanofi, 
pricing  and  reimbursement  for  the  products  commercialized  or  co-commercialized  thereunder  outside  the  United  States  are  the 
responsibility  of  Sanofi.  Prices  for  our  marketed  products  in  jurisdictions  outside  the  United  States  are  based  on  local  market 
economics and competition and are likely to differ from country to country. In the United States, prices for pharmaceuticals are 
generally higher than in the bordering nations of Canada and Mexico and sales of our marketed products in the United States may 
be reduced if the applicable product marketed in those bordering nations is imported into the United States. In addition, there are 
proposals to legalize the import of pharmaceuticals from outside the United States into the United States. If such proposals were 
implemented, our future revenues derived from sales of our marketed products could be reduced. Parallel-trading practices also 
are  of  particular  relevance  to  the  EU,  where  they  have  been  encouraged  by  the  current  regulatory  framework.  These  types  of 
imports may exert pressure on the pricing of our marketed products in a particular market or reduce sales recorded by us or our 
collaborators, thereby adversely affecting our results of operations.

We  may  be  unsuccessful  in  continuing  the  commercialization  of  our  marketed  products  or  in  commercializing  our  product 
candidates  or  new  indications  for  our  marketed  products,  if  approved,  which  would  materially  and  adversely  affect  our 
business, profitability, and future prospects.

Even  if  clinical  trials  demonstrate  the  safety  and  effectiveness  of  any  of  our  product  candidates  for  a  specific  disease  and  the 
necessary regulatory approvals are obtained, the commercial success of any of our product candidates or new indications for our 
marketed products will depend upon, among other things, their acceptance by patients, the medical community, and third-party 
payors and on our and our collaborators' ability to successfully manufacture, market, and distribute those products in substantial 
commercial  quantities  or  to  establish  and  manage  the  required  infrastructure  to  do  so,  including  large-scale  information 
technology  systems  and  a  large-scale  distribution  network.  Establishing  and  maintaining  sales,  marketing,  and  distribution 
capabilities  are  expensive  and  time-consuming.  Even  if  we  obtain  regulatory  approval  for  our  product  candidates  or  new 
indications, if they are not successfully commercialized, we will not be able to recover the significant investment we have made in 
developing such products and our business, prospects, operating results, and financial condition would be severely harmed.

The  commercial  success  of  our  products  may  also  be  adversely  affected  by  guidelines  or  recommendations  to  healthcare 
providers,  administrators,  payors,  and  patient  communities  that  result  in  decreased  use  of  our  products.  Such  guidelines  or 
recommendations  may  be  published  not  only  by  governmental  agencies,  but  also  professional  societies,  practice  management 
groups, private foundations, and other interested parties.

Our  product  candidates  are  delivered  either  by  intravenous  infusion  or  by  intravitreal  or  subcutaneous  injections,  which  are 
generally less well received by patients than tablet or capsule delivery and this could adversely affect the commercial success of 
those products if they receive marketing approval.

We are dependent upon a small number of customers for a significant portion of our revenue, and the loss of or significant 
reduction in sales to these customers would adversely affect our results of operations.

We  sell  our  marketed  products  for  which  we  record  net  product  sales  in  the  United  States  to  several  distributors  and  specialty 
pharmacies, as applicable (collectively, "distributor customers"), which generally sell the product directly to healthcare providers 
or  other  pharmacies  (as  applicable).  For  the  years  ended  December  31,  2023  and  2022,  our  product  sales  to  two  distributor 
customers  accounted  on  a  combined  basis  for  76%  and  83%  of  our  total  gross  product  revenue,  respectively.  We  expect 
significant  distributor  customer  concentration  to  continue  for  the  foreseeable  future.  Our  ability  to  generate  and  grow  sales  of 
these products will depend, in part, on the extent to which our distributor customers are able to provide adequate distribution of 

46

these products to healthcare providers. Although we believe we can find additional distributors, if necessary, our revenue during 
any period of disruption could suffer and we might incur additional costs. In addition, these distributor customers are responsible 
for  a  significant  portion  of  our  net  trade  accounts  receivable  balances.  The  loss  of  any  large  distributor  customer,  a  significant 
reduction in sales we make to them, any cancellation of orders they have made with us, or any failure to pay for the products we 
have shipped to them could adversely affect our results of operations. Commercialization of any of our marketed products may 
also  be  adversely  impacted  by  vertical  integration  of  private  payor  healthcare  and  insurance  programs,  health  maintenance 
organizations,  and  PBMs,  or  further  consolidation  among  the  healthcare  providers  served  by  our  distributor  customers  if,  for 
example,  one  or  more  consolidated  groups  of  healthcare  providers  determines  not  to  use  (or  decides  to  switch  from)  such 
marketed product in favor of a competing product. See also "The commercial success of our products and product candidates is 
subject to significant competition - Marketed Products" above.

If we are unable to establish commercial capabilities outside the United States for Libtayo, Dupixent, and any other products 
we  intend  to  commercialize  or  co-commercialize  outside  the  United  States,  our  business,  prospects,  operating  results,  and 
financial condition may be adversely affected.

We have limited commercial capabilities outside the United States and have not yet fully established an organization for the sales, 
marketing, and distribution of marketed products outside the United States. We are in the process of establishing these capabilities 
outside  the  United  States  for  Libtayo  in  connection  with  the  2022  amendment  to  the  IO  Collaboration  whereby  all  rights  to 
develop, commercialize, and manufacture Libtayo will be transferred exclusively to our Company, on a worldwide basis, over the 
course of a defined transition period. In addition to fully establishing these commercial capabilities by the end of the transition 
period,  we  will  also  need  to  obtain  and/or  maintain  regulatory  approvals  and  secure  pricing  and  reimbursement  for  Libtayo  in 
many jurisdictions outside the United States (including Europe and Japan). Further, following the exercise of our option under the 
Antibody  Collaboration  to  co-commercialize  Dupixent  in  certain  jurisdictions  outside  the  United  States,  we  have  established 
certain co-commercialization capabilities for Dupixent in some of these jurisdictions and are in the process of establishing these 
capabilities in others. There may be other circumstances in which we need to establish further commercial capabilities outside the 
United  States,  including  because  we  decide  to  commercialize  a  particular  product  independently;  we  are  unable  to  find  an 
appropriate collaborator; or an existing collaborator decides to opt out or breaches its obligations to us with respect to a particular 
product.

In order to commercialize or co-commercialize any products outside the United States beyond what we have done so far, we must 
build  our  sales,  marketing,  distribution,  regulatory,  managerial,  and  other  capabilities  in  the  relevant  markets  or  make 
arrangements with third parties to perform these services, any of which will likely be expensive and time consuming and could 
delay product launch or the co-commercialization of a product in one or more markets outside the United States. We cannot be 
certain that we will be able to successfully develop commercial capabilities outside the United States (particularly as it relates to 
Libtayo, for which we plan to expand our global commercialization footprint as noted above) within an acceptable time frame, 
without incurring substantial expenses, or at all. These and other difficulties relating to commercializing our products outside the 
United States may harm our business, prospects, operating results, and financial condition.

Risks Related to Maintaining Approval of Our Marketed Products and the Development and Obtaining Approval of Our 
Product Candidates and New Indications for Our Marketed Products

Obtaining and maintaining regulatory approval for drug products is costly, time-consuming, and highly uncertain. If we or 
our  collaborators  do  not  maintain  regulatory  approval  for  our  marketed  products,  and  obtain  regulatory  approval  for  our 
product  candidates  or  new  indications  for  our  marketed  products,  we  will  not  be  able  to  market  or  sell  them,  which  would 
materially and negatively impact our business, prospects, operating results, and financial condition.

We cannot sell or market products without regulatory approval or other authorization. If we or our collaborators do not maintain 
regulatory approval for our marketed products, and obtain regulatory approval for our product candidates or new indications of 
our marketed products (or are materially delayed in doing so), the value of our Company and our business, prospects, operating 
results, and financial condition may be materially harmed.

In the United States, we (which, for purposes of this risk factor, includes our collaborators, unless otherwise stated or required by 
the  context)  must  obtain  and  maintain  approval  from  the  FDA  for  each  drug  we  intend  to  sell.  We  must  obtain  and  maintain 
similar  regulatory  approvals  from  comparable  foreign  regulatory  authorities  in  order  to  sell  drugs  outside  the  United  States. 
Obtaining  FDA  or  comparable  foreign  regulatory  authority  approval  for  a  new  drug  or  indication  is  typically  a  lengthy  and 
expensive process, and approval is highly uncertain. We cannot predict with certainty if or when we might submit for regulatory 
approval for any of our product candidates currently under development. Any approvals we may obtain may not cover all of the 
clinical  indications  for  which  we  are  seeking  approval.  Also,  an  approval  might  contain  significant  limitations  in  the  form  of 
narrow  indications,  warnings,  precautions,  or  contra-indications  with  respect  to  conditions  of  use.  Additionally,  in  the  United 
States, the FDA may determine that a REMS is necessary to ensure that the benefits of a new product outweigh its risks, and the 
product can therefore be approved. A REMS may include various elements, ranging from a medication guide or patient package 

47

insert to limitations on who may prescribe or dispense the drug, depending on what the FDA considers necessary for the safe use 
of the drug. The FDA has substantial discretion in the approval process (including with respect to setting specific conditions for 
submission)  and  may  either  refuse  to  accept  an  application  for  substantive  review  or  may  form  the  opinion  after  review  of  an 
application that the application is insufficient to allow approval of a product candidate. If the FDA does not accept our application 
for review or approve our application, it may require that we conduct additional clinical, preclinical, or manufacturing validation 
studies and submit the data before it will reconsider our application. Depending on the extent of these or any other studies that 
might be required, approval of any applications that we submit may be delayed significantly, or we may be required to expend 
more resources. It is also possible that any such additional studies, if performed and completed, may not be considered sufficient 
by  the  FDA  to  make  our  applications  approvable.  If  any  of  these  outcomes  occur,  we  may  be  forced  to  delay  or  abandon  our 
applications for approval. For example, in October 2023, the FDA issued a CRL for the sBLA for Dupixent in CSU stating that 
additional efficacy data are required to support an approval. While an ongoing Phase 3 clinical trial (in biologic-naïve patients) 
continues to enroll patients and results are expected in late 2024, there can be no assurance that such data will ultimately result in 
FDA approval.

In  certain  instances  (such  as  when  we  use  a  biomarker-based  test  to  identify  and  enroll  specific  patients  in  a  clinical  trial), 
regulatory approval of a companion diagnostic to our therapeutic product candidate may be required as a condition to regulatory 
approval of the therapeutic product candidate. We may need to rely on third parties to provide companion diagnostics for use with 
our  product  candidates.  Such  third  parties  may  be  unable  or  unwilling  on  terms  acceptable  to  us  to  provide  such  companion 
diagnostics or to obtain timely regulatory approval of or product labeling updates for such companion diagnostics, which could 
negatively impact regulatory approval of our product candidates or may result in increased development costs or delays.

The FDA may also require us to conduct additional clinical trials after granting approval of a product. The FDA has the explicit 
authority to require post-marketing studies (also referred to as post-approval or Phase 4 studies), labeling changes based on new 
safety information, and compliance with FDA-approved risk evaluation and mitigation strategies. Post-approval studies, whether 
conducted  by  us  or  by  others  and  whether  mandated  by  regulatory  agencies  or  voluntary,  and  other  data  about  our  marketed 
products (or data about products similar to our marketed products that implicate an entire class of products or are perceived to do 
so) may result in changes in product labeling, restrictions on use, product withdrawal or recall, loss of approval, or lower sales of 
our  products.  Obligations  equivalent  in  scope,  but  which  can  vary  widely  in  application,  apply  in  countries  outside  the  United 
States.

According to the FDA policies under the Prescription Drug User Fee Act, the FDA system of review times for new drugs includes 
standard review and priority review. While the FDA has performance goals that provide for action on BLA submissions by certain 
deadlines, the FDA's review goals are subject to change and the duration of the FDA's review depends on a number of factors, 
including the number and types of other applications that are submitted to the FDA around the same time period or are pending. 
The FDA's review may be delayed because the FDA requests additional information or for other reasons, including those beyond 
our  control.  For  example,  in  2022,  an  FDA  travel  complication  related  to  scheduling  a  routine  clinical  trial  site  inspection  in 
eastern  Europe  delayed  by  nearly  two  months  the  FDA's  approval  of  our  sBLA  for  the  combination  treatment  of  Libtayo  with 
chemotherapy in NSCLC. 

If  we  believe  we  meet  eligibility  requirements,  we  may  apply  for  various  regulatory  incentives  in  the  United  States,  such  as 
breakthrough therapy designation, fast track designation, accelerated approval, or priority review, where available, that serve to 
expedite drug development and/or review, and we may also seek similar designations elsewhere in the world. Often, regulatory 
agencies  have  broad  discretion  in  determining  whether  or  not  product  candidates  qualify  for  such  regulatory  incentives  and 
benefits, and we cannot guarantee we would be successful in obtaining beneficial regulatory designations by the FDA or other 
regulatory  agencies.  Even  if  obtained,  such  designations  may  not  result  in  faster  development  processes,  reviews,  or  approvals 
compared to drugs considered for approval under conventional FDA procedures. In addition, the FDA may later decide that any of 
our development programs no longer meets the conditions for a beneficial regulatory designation (including due to factors beyond 
our control, such as intervening competitive developments) or decide that the time period for FDA review or approval will not be 
shortened. Recent FDA draft guidance relating to accelerated approval of oncology therapeutics indicates that a confirmatory trial 
for a particular oncology product candidate should be underway when the related BLA is submitted to the FDA and also states 
that  the  FDA  may  require  that  a  confirmatory  trial  for  a  particular  oncology  product  candidate  be  well  underway,  if  not  fully 
enrolled, by the time of the accelerated approval action. Application of this guidance to our product candidates may result in a 
delay of the FDA review and approval process despite any earlier beneficial regulatory designation such product candidates may 
have received.

48

The  FDA  and  comparable  foreign  regulatory  authorities  enforce  GCPs  and  other  regulations  and  legal  requirements  through 
periodic inspections of trial sponsors, clinical research organizations ("CROs"), principal investigators, and trial sites. If we or any 
of the third parties conducting our clinical studies are determined to have failed to fully comply with GCPs, the study protocol or 
applicable regulations, the clinical data generated in those studies may be deemed unreliable. This and similar instances of non-
compliance with GCPs could result in non-approval of our product candidates by the FDA or foreign regulatory authorities such 
as  the  EC,  or  we  or  the  FDA  or  such  other  regulatory  authorities  may  decide  to  conduct  additional  inspections  or  require 
additional  clinical  studies,  which  would  delay  our  development  programs,  require  us  to  incur  additional  costs,  and  could 
substantially harm our business, prospects, operating results, and financial condition.

Before approving a new drug or biologic product, the FDA and such comparable foreign regulatory authorities require that the 
facilities at which the product will be manufactured or advanced through the supply chain be in compliance with current Good 
Manufacturing  Practices,  or  cGMP,  requirements  and  regulations  governing  the  manufacture,  shipment,  and  storage  of  the 
product. Additionally, manufacturers of biological products and their facilities are subject to payment of substantial user fees and 
continual review and periodic inspections by the FDA and other regulatory authorities for compliance with cGMP regulations and 
adherence  to  any  commitments  made  in  the  applicable  BLA.  These  cGMP  requirements  and  regulations  are  not  prescriptive 
instructions on how to manufacture products, but rather a series of principles that must be observed during manufacturing; as a 
result, the manner in which such principles are implemented may not be specifically delineated, which can present a challenging 
environment  as  the  FDA  and  comparable  foreign  regulatory  authorities  increasingly  scrutinize  compliance  with  these 
requirements and regulations. As a result, manufacturing product candidates in compliance with these regulatory requirements is 
complex, time-consuming, and expensive. To be successful, our products must be manufactured in compliance with regulatory 
requirements, and at competitive costs. If we or any of our third-party manufacturers, product packagers, labelers, or other parties 
performing steps in the supply chain are unable to maintain regulatory compliance with cGMP, the FDA and comparable foreign 
regulatory authorities can impose monetary penalties or other civil or criminal sanctions, including, among other things, refusal to 
approve a pending application for a new drug or biologic product, or revocation of a pre-existing approval. For example, in June 
2023, the FDA issued a CRL concerning the Company's BLA for EYLEA HD for the treatment of wAMD, DME, and DR due to 
unresolved  observations  resulting  from  an  inspection  at  the  contract  manufacturing  organization  Catalent,  which  resulted  in  a 
delay  of  the  FDA  approval  of  EYLEA  HD  by  nearly  two  months.  For  additional  information,  see  "Risks  Related  to 
Manufacturing and Supply - Our or our collaborators' failure to meet the stringent requirements of governmental regulation in 
the  manufacture  of  drug  products  or  product  candidates  could  result  in  incurring  substantial  remedial  costs,  delays  in  the 
development  or  approval  of  our  product  candidates  or  new  indications  for  our  marketed  products  and/or  in  their  commercial 
launch  if  regulatory  approval  is  obtained,  and  a  reduction  in  sales."  Our  business,  prospects,  operating  results,  and  financial 
condition  may  be  materially  harmed  as  a  result  of  noncompliance  with  the  requirements  and  regulations  described  in  this 
paragraph.

We are also subject to ongoing requirements imposed by the FDA and comparable foreign regulatory authorities governing the 
labeling, packaging, storage, distribution, safety surveillance, advertising, promotion, record-keeping, and reporting of safety and 
other  post-marketing  information.  The  holder  of  an  approved  BLA  or  foreign  equivalent  is  obligated  to  monitor  and  report 
adverse  events  and  any  failure  of  a  product  to  meet  the  specifications  in  the  BLA.  The  holder  of  an  approved  BLA  or  foreign 
equivalent  must  also  submit  new  or  supplemental  applications  and  obtain  FDA  approval  for  certain  changes  to  the  approved 
product, product labeling, or manufacturing process. Advertising and promotional materials must comply with FDA regulations 
and  those  of  foreign  regulatory  authorities  and  may  be  subject  to  other  potentially  applicable  federal  and  state  laws.  The 
applicable  regulations  in  countries  outside  the  U.S.  grant  similar  powers  to  the  competent  authorities  and  impose  similar 
obligations on companies.

In  addition  to  the  FDA  and  other  regulatory  agency  regulations  in  the  United  States,  we  are  subject  to  a  variety  of  foreign 
regulatory requirements governing human clinical trials, manufacturing, marketing and approval of drugs, and commercial sale 
and distribution of drugs in countries outside the United States. The foreign regulatory approval process is similarly a lengthy and 
expensive process, the result of which is highly uncertain, and foreign regulatory requirements include all of the risks associated 
with FDA approval as well as country specific regulations. We and our collaborators must maintain regulatory compliance for the 
products we or they commercialize in countries outside the United States. From time to time, we may hold a product's marketing 
approval in a jurisdiction outside the United States where we may have less experience and where our regulatory capabilities may 
be more limited; this will be the case for Libtayo in many jurisdictions outside the United States (including Europe and Japan) 
once  we  complete  the  transition  from  Sanofi  pursuant  to  the  amendment  to  the  IO  Collaboration  discussed  above.  In  addition, 
actions by a regulatory agency in a country or region with respect to a product candidate may have an impact on the approval 
process for that product candidate in another country or region. Foreign regulatory authorities may ask for additional data in order 
to begin a clinical study, including Phase 3 clinical trials required to submit a Marketing Authorization Application ("MAA") in 
the  EU.  In  addition,  such  authorities  often  have  the  authority  to  require  post-approval  studies,  such  as  a  PASS  and/or  PAES, 
which involve various risks similar to those described above. Whether or not we obtain FDA approval for a product in the United 
States,  we  must  obtain  approval  of  the  product  by  the  comparable  regulatory  authorities  in  countries  outside  the  United  States 
before we can market that product or any other product in those countries.

49

Furthermore,  we  are  subject  to  extensive  pharmacovigilance  reporting  and  other  pharmacovigilance  requirements,  which  may 
differ in the numerous countries in which we conduct clinical trials or commercialize a product. Failure to comply with any such 
requirements may result in the premature closure of the clinical trials and other enforcement actions by the relevant regulatory 
authorities. For example, if we do not manage to retain a QPPV, to maintain a PSMF, or to comply with other pharmacovigilance 
obligations  in  the  EEA,  we  may  be  at  risk  of  our  clinical  trials  being  closed  prematurely,  our  marketing  authorization  being 
suspended, and we may be subject to other enforcement actions by the national competent authorities of the EEA or the EC. 

Preclinical  and  clinical  studies  required  for  our  product  candidates  and  new  indications  of  our  marketed  products  are 
expensive and time-consuming, and their outcome is highly uncertain. If any such studies are delayed or yield unfavorable 
results, regulatory approval for our product candidates or new indications of our marketed products may be delayed or become 
unobtainable.

As described above, we must conduct extensive testing of our product candidates and new indications of our marketed products 
before we can obtain regulatory approval to market and sell them. We need to conduct both preclinical animal testing and human 
clinical  trials.  Conducting  such  studies  is  a  lengthy,  time-consuming,  and  expensive  process.  These  tests  and  trials  may  not 
achieve  favorable  results  for  many  reasons,  including,  among  others,  failure  of  the  product  candidate  to  demonstrate  safety  or 
efficacy, the development of serious or life-threatening adverse events (or side effects) caused by or connected with exposure to 
the  product  candidate  (or  prior  or  concurrent  exposure  to  other  products  or  product  candidates),  difficulty  in  enrolling  and 
maintaining subjects in a clinical trial, clinical trial design that may not make it possible to enroll or retain a sufficient number of 
patients to achieve a statistically significant result or the desired level of statistical significance for the endpoint in question, lack 
of  sufficient  supplies  of  the  product  candidate  or  comparator  drug,  and  the  failure  of  clinical  investigators,  trial  monitors, 
contractors,  consultants,  or  trial  subjects  to  comply  with  the  trial  plan,  protocol,  or  applicable  regulations  related  to  the  FDA's 
GLPs or GCPs. A clinical trial may also fail because the dose(s) of the investigational drug included in the trial were either too 
low or too high to determine the optimal effect of the investigational drug in the disease setting.

Additionally,  conducting  clinical  trials  in  countries  outside  the  United  States  presents  additional  risks,  including  political  and 
economic  risks  that  are  not  present  in  the  United  States,  such  as  armed  conflict  and  economic  embargoes  or  boycotts.  For 
example, we and our collaborators are currently conducting and may in the future conduct or initiate clinical trials with sites in 
Russia,  Ukraine,  and/or  Israel.  While  we  currently  do  not  expect  the  Russia-Ukraine  or  Hamas-Israel  armed  conflict  or  related 
developments to have a significant impact on our ability to obtain results from clinical trials conducted by us or our collaborators, 
further escalation (whether in these countries or surrounding areas) may adversely affect our ability to adequately conduct certain 
clinical trials and maintain compliance with relevant protocols due to, among other reasons, the prioritization of hospital resources 
away  from  clinical  trials,  reallocation  or  evacuation  of  site  staff  and  subjects,  or  as  a  result  of  government-imposed  curfews, 
warfare, violence, or other governmental action or other events that restrict movement. These developments may also result in our 
inability to access sites for monitoring or to obtain data from affected sites or patients going forward. We could also experience 
disruptions  in  our  supply  chain  or  limits  to  our  ability  to  provide  sufficient  investigational  materials  in  such  countries  and 
surrounding  regions.  Clinical  trial  sites  may  suspend  or  terminate  the  trials  being  conducted  and  patients  could  be  forced  to 
evacuate or choose to relocate, making them unavailable for initial or further participation in such trials. Alternative sites in these 
areas may not be available and we may need to find other countries to conduct the relevant trials. Furthermore, military action 
may prevent the FDA or other regulatory agencies from inspecting clinical sites in these countries. Such interruptions may delay 
our plans for clinical development and approvals for our product candidates.

We will need to reevaluate any drug candidate that does not test favorably and either conduct new studies, which are expensive 
and  time  consuming,  or  abandon  that  drug  development  program.  If  preclinical  testing  yields  unfavorable  results,  product 
candidates  may  not  advance  to  clinical  trials.  The  failure  of  clinical  trials  to  demonstrate  the  safety  and  effectiveness  of  our 
clinical  candidates  for  the  desired  indication(s)  would  preclude  the  successful  development  of  those  candidates  for  such 
indication(s), in which event our business, prospects, operating results, and financial condition may be materially harmed.

Furthermore,  some  of  our  products  and  product  candidates  (such  as  Libtayo)  are  studied  in  combination  with  agents  and 
treatments developed by us or our collaborators. There may be additional risks and unforeseen safety issues resulting from such 
combined administration, any of which may materially adversely impact clinical development of these product candidates and our 
ability to obtain regulatory approval.

In some jurisdictions such as the EU, initiating Phase 3 clinical trials and clinical trials in the pediatric population is subject to a 
requirement to obtain approval or a waiver from the competent authorities of the EU Member States and/or the EMA. If we do not 
obtain  such  approval,  our  ability  to  conduct  clinical  trials  and  obtain  marketing  authorizations  or  approvals  may  be  severely 
impaired and our business may be adversely impacted.

Certain of our research and development activities are conducted at our existing facilities primarily located in Tarrytown, New 
York. As we continue to expand, we may lease, operate, purchase, or construct additional facilities to expand our research and 
development  capabilities  in  the  future.  Expanding  our  research  and  laboratory  facilities  may  require  significant  time  and 

50

resources.  Further,  we  may  be  unable  to  pursue  our  research  and  development  efforts  if  the  relevant  facility  were  to  cease 
operations  due  to  fire,  climate  change,  natural  disasters,  acts  of  war  or  terrorism,  or  other  disruptions.  Any  related  delays  may 
interfere with our research and development efforts and our business may be adversely impacted.

Successful development of our current and future product candidates is uncertain.

Only a small minority of all research and development programs ultimately result in commercially successful drugs. Clinical trials 
may not demonstrate statistically sufficient effectiveness and safety to obtain the requisite regulatory approvals for these product 
candidates  in  these  indications.  Many  companies  in  the  biopharmaceutical  industry,  including  our  Company,  have  suffered 
significant setbacks in clinical trials, even after promising results had been obtained in earlier trials. In a number of instances, we 
have terminated the development of product candidates due to a lack of or only modest effectiveness and/or safety concerns, and 
clinical trials evaluating our product candidates have failed to meet the relevant endpoints. Moreover, even if we obtain positive 
results from preclinical testing or clinical trials, we may not achieve the same success in future trials, or the FDA and analogous 
foreign regulatory authorities may deem the results insufficient for an approval. If concerns arise about the safety of a product 
candidate or non-compliance with the protocol or applicable regulatory requirements, the FDA or other regulatory authorities can 
delay  or  suspend  a  clinical  trial  by  placing  it  on  a  full  or  partial  "clinical  hold"  pending  receipt  of  additional  data  or  the 
satisfaction of other conditions. A clinical hold may require us to spend significant resources to address the underlying causes of 
the clinical hold and may result in a delay in the clinical program, which may be significant. In addition, if we are not able to 
successfully address such underlying causes or our response is not deemed adequate to lift the clinical hold, the clinical program 
may have to be terminated. Any such clinical program delays or terminations may adversely affect our business.

Many  of  our  clinical  trials  are  conducted  under  the  oversight  of  IDMCs.  These  independent  oversight  bodies  are  made  up  of 
external  experts  who  review  the  progress  of  ongoing  clinical  trials,  including  available  safety  and  efficacy  data,  and  make 
recommendations  concerning  a  trial's  continuation,  modification,  or  termination  based  on  interim,  unblinded  data.  Any  of  our 
ongoing clinical trials may be discontinued or amended in response to recommendations made by responsible IDMCs based on 
their  review  of  such  interim  trial  results.  For  example,  we  previously  discontinued  actively  treating  patients  with  fasinumab 
following a recommendation from the responsible IDMC that the program be terminated based on available evidence at that time; 
and we later discontinued further clinical development of fasinumab. The recommended termination or material modification of 
any  of  our  ongoing  late-stage  clinical  trials  by  an  IDMC  could  negatively  impact  the  future  development  of  our  product 
candidate(s), and our business, prospects, operating results, and financial condition may be materially harmed.

We  are  studying  our  product  candidates  in  a  wide  variety  of  indications  in  clinical  trials.  Many  of  these  trials  are  exploratory 
studies designed to evaluate the safety profile of these compounds and to identify what diseases and uses, if any, are best suited 
for these product candidates. These product candidates may not demonstrate the requisite efficacy and/or safety profile to support 
continued development for some or all of the indications that are being, or are planned to be, studied, which would diminish our 
clinical "pipeline" and could negatively affect our future prospects and the value of our Company.

Serious  complications  or  side  effects  in  connection  with  the  use  of  our  products  and  in  clinical  trials  for  our  product 
candidates and new indications for our marketed products could cause our regulatory approvals to be revoked or limited or 
lead  to  delay  or  discontinuation  of  development  of  our  product  candidates  or  new  indications  for  our  marketed  products, 
which could severely harm our business, prospects, operating results, and financial condition.

During the conduct of clinical trials, patients report changes in their health, including illnesses, injuries, and discomforts, to their 
study  doctor.  Often,  it  is  not  possible  to  determine  whether  or  not  the  drug  candidate  being  studied  caused  these  conditions. 
Various illnesses, injuries, and discomforts have been reported from time-to-time during clinical trials of our product candidates 
and  new  indications  for  our  marketed  products.  It  is  possible  that  as  we  test  our  drug  candidates  or  new  indications  in  larger, 
longer,  and  more  extensive  clinical  programs,  or  as  use  of  these  drugs  becomes  more  widespread  if  they  receive  regulatory 
approval, illnesses, injuries, and discomforts that were observed in earlier trials, as well as conditions that did not occur or went 
undetected in previous trials, will be reported by patients. Many times, side effects are only detectable after investigational drugs 
are  tested  in  large-scale,  Phase  3  clinical  trials  or,  in  some  cases,  after  they  are  made  available  to  patients  after  approval.  If 
additional clinical experience indicates that any of our product candidates or new indications for our marketed products has many 
side effects or causes serious or life-threatening side effects, the development of the product candidate may be delayed or fail, or, 
if  the  product  candidate  has  received  regulatory  approval,  such  approval  may  be  revoked,  which  would  severely  harm  our 
business, prospects, operating results, and financial condition.

With respect to EYLEA and EYLEA HD, there are many potential safety concerns associated with significant blockade of VEGF 
that may limit our ability to further successfully commercialize EYLEA and to successfully commercialize EYLEA HD. These 
serious and potentially life-threatening risks, based on clinical and preclinical experience of VEGF inhibitors, include bleeding, 
intestinal  perforation,  hypertension,  proteinuria,  congestive  heart  failure,  heart  attack,  and  stroke.  Other  VEGF  blockers  have 
reported side effects that became evident only after large-scale trials or after marketing approval when large numbers of patients 
were treated. There are risks inherent in the intravitreal administration of drugs like aflibercept (such as intraocular inflammation 

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("IOI"),  sterile  and  culture  positive  endophthalmitis,  corneal  decomposition,  retinal  detachment,  retinal  tear,  and  retinal 
vasculitis), which can cause injury to the eye and other complications. The side effects previously reported for aflibercept include 
conjunctival hemorrhage, macular degeneration, eye pain, retinal hemorrhage, and vitreous floaters. While the safety of EYLEA 
HD was similar to EYLEA in clinical trials, it is possible that the use of EYLEA HD outside the clinical trial setting may yield 
different outcomes or patient experiences. In addition, commercialization of EYLEA and EYLEA HD or our other products and 
potential future commercialization of our product candidates may be impacted by actions of third parties on which we rely, such 
as manufacturers of syringes or other devices used in the administration of our products. These and other complications or issues 
or side effects could harm further development and/or commercialization of EYLEA and EYLEA HD. 

Dupixent and Libtayo are being studied in additional indications, as shown in the table under Part I, Item 1. "Business - Programs 
in Clinical Development." There is no guarantee that regulatory approval of Dupixent or Libtayo (as applicable) in any of these 
indications will be successfully obtained. The side effects previously reported for Dupixent include hypersensitivity reactions, eye 
problems (including conjunctivitis and keratitis), injection-site reactions, eye and eyelid inflammation, cold sores, oropharyngeal 
pain, eosinophilia, insomnia, toothache, gastritis, joint pain (arthralgia), parasitic (helminth) infections, and facial rash or redness; 
and  the  side  effects  previously  reported  for  Libtayo  include  certain  immune-mediated  adverse  reactions  that  may  occur  in  any 
organ system or tissue, including pneumonitis, colitis, hepatitis, endocrinopathies, nephritis, and dermatologic reactions, as well 
as  infusion-related  reactions,  cellulitis,  sepsis,  pneumonia,  urinary  tract  infection,  fatigue,  rash,  and  diarrhea.  These  and  other 
complications or side effects could harm further development and/or commercialization of Dupixent and Libtayo (as applicable).

There also are risks inherent in subcutaneous injections (which are used for administering most of our antibody-based products 
and product candidates), such as injection-site reactions (including redness, itching, swelling, pain, and tenderness) and other side 
effects. In addition, there are risks inherent in intravenous administration (which are used for some of our antibody-based products 
and  product  candidates),  such  as  infusion-related  reactions  (including  nausea,  pyrexia,  rash,  and  dyspnea).  These  and  other 
complications  or  side  effects  could  harm  further  development  and/or  commercialization  of  our  antibody-based  products  and 
product candidates utilizing this method of administration.

We may be unable to formulate or manufacture our product candidates in a way that is suitable for clinical or commercial use, 
which would delay or prevent continued development of such candidates and/or receipt of regulatory approval or commercial 
sale, which could materially harm our business, prospects, operating results, and financial condition.

If we are unable to continue to develop suitable product formulations or manufacturing processes to support large-scale clinical 
testing  of  our  product  candidates,  including  our  antibody-based  product  candidates,  we  may  be  unable  to  supply  necessary 
materials  for  our  clinical  trials,  which  would  delay  or  prevent  the  development  of  our  product  candidates.  Similarly,  if  we  are 
unable,  directly  or  through  our  collaborators  or  third  parties,  to  supply  sufficient  quantities  of  our  products  or  develop 
formulations  of  our  product  candidates  suitable  for  commercial  use,  we  will  be  unable  to  obtain  regulatory  approval  for  those 
product candidates.

Many of our products are intended to be used and, if approved, our product candidates may be used in combination with drug-
delivery devices, which may result in additional regulatory, commercialization, and other risks.

Many of our products are used and some of our products and product candidates may be used, if approved, in combination with a 
drug-delivery  device,  including  a  pre-filled  syringe,  patch  pump,  auto-injector,  or  other  delivery  system.  For  example,  in  the 
United States and the EU, EYLEA is approved in the 2mg pre-filled syringe. The success of our products and product candidates 
may depend to a significant extent on the performance of such devices, some of which may be novel or comprised of complex 
components. Given the increased complexity of the review process when approval of the product and device is sought under a 
single marketing application and the additional risks resulting from a product candidate's designation as a combination product 
discussed  below,  our  product  candidates  used  with  such  drug-delivery  devices  may  be  substantially  delayed  in  receiving 
regulatory  approval  or  may  not  be  approved  at  all.  The  FDA  review  process  and  criteria  for  such  applications  are  not  well 
established,  which  could  also  lead  to  delays  in  the  approval  process.  In  addition,  some  of  these  drug-delivery  devices  may  be 
provided  by  single-source,  third-party  providers  or  our  collaborators.  In  any  such  case,  we  may  be  dependent  on  the  sustained 
cooperation  of  those  third-party  providers  or  collaborators  to  supply  and  manufacture  the  devices;  to  conduct  the  studies  and 
prepare related documentation required for approval or clearance by the applicable regulatory agencies; and to continue to meet 
the applicable regulatory and other requirements to maintain approval or clearance once it has been received. In addition, other 
parties  may  allege  that  our  drug-delivery  devices  infringe  patents  or  other  intellectual  property  rights.  For  example,  we  are 
currently party to patent infringement and other proceedings relating to the EYLEA pre-filled syringe, as described in Note 16 to 
our Consolidated Financial Statements. Failure to successfully develop or supply the devices, delays in or failure of the studies 
conducted  by  us,  our  collaborators,  or  third-party  providers,  or  failure  of  our  Company,  our  collaborators,  or  the  third-party 
providers to obtain or maintain regulatory approval or clearance of the devices could result in increased development costs, delays 
in or failure to obtain regulatory approval, and associated delays in a product or product candidate reaching the market. Loss of 
regulatory approval or clearance of a device that is used with our product may also result in the removal of our product from the 

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market. Further, failure to successfully develop or supply and manufacture these devices, or to gain or maintain their approval, 
could adversely affect sales of the related products.

In the United States, each component of a combination product is subject to the requirements established by the FDA for that type 
of  component,  whether  a  drug,  biologic,  or  device.  The  determination  whether  a  product  is  a  combination  product  or  two 
separately regulated products is made by the FDA on a case-by-case basis. Although a single marketing application is generally 
sufficient  for  the  approval,  clearance,  or  licensure  of  a  combination  product,  the  FDA  may  determine  that  separate  marketing 
applications are necessary. In addition, submitting separate marketing applications may be necessary to receive some benefit that 
accrues  only  from  approval  under  a  particular  type  of  application.  This  could  significantly  increase  the  resources  and  time 
required to bring a particular combination product to market.

Risks Related to Intellectual Property and Market Exclusivity

For  purposes  of  this  subsection,  references  to  our  intellectual  property  (including  patents,  trademarks,  copyrights,  and  trade 
secrets) include that of our collaborators and licensees, unless otherwise stated or required by the context.

If  we  cannot  protect  the  confidentiality  of  our  trade  secrets,  or  our  patents  or  other  means  of  defending  our  intellectual 
property are insufficient to protect our proprietary rights, our business and competitive position will be harmed.

Our business requires using sensitive and proprietary technology and other information that we protect as trade secrets. We seek 
to prevent improper disclosure of these trade secrets through confidentiality agreements and other means. If our trade secrets are 
improperly  disclosed,  by  our  current  or  former  employees,  our  collaborators,  or  otherwise,  it  could  help  our  competitors  and 
adversely  affect  our  business.  Our  ability  to  protect  our  trade  secrets  may  be  impaired  by  a  number  of  risks  and  uncertainties, 
including  those  discussed  under  "Other  Regulatory  and  Litigation  Risks  -  Increasing  use  of  social  media  and  artificial 
intelligence-based platforms could give rise to liability, breaches of data security and privacy laws, or reputational damage" and 
"Other  Risks  Related  to  Our  Business  -  Significant  disruptions  of  information  technology  systems  or  breaches  of  data  security 
could adversely affect our business" below. We will be able to protect our proprietary rights only to the extent that our proprietary 
technologies and other information are covered by valid and enforceable patents or are effectively maintained as trade secrets. The 
patent position of biotechnology companies, including our Company, involves complex legal and factual questions and, therefore, 
enforceability  cannot  be  predicted  with  certainty.  Our  patents  may  be  challenged,  invalidated,  held  to  be  unenforceable,  or 
circumvented.  For  example,  certain  of  our  U.S.  patents  (including  those  pertaining  to  our  key  products,  such  as  EYLEA)  have 
been  and  may  in  the  future  be  challenged  by  parties  who  file  a  request  for  post-grant  review  or  inter  partes  review  under  the 
America  Invents  Act  of  2011  or  ex  parte  reexamination,  as  described  in  Note  16  to  our  Consolidated  Financial  Statements 
included in this report. Post-grant proceedings are increasingly common in the United States and are costly to defend. In addition, 
patent applications filed outside the United States may be challenged by other parties, for example, by filing pre-grant third-party 
observations that argue against patentability or a post-grant opposition. Such opposition proceedings are increasingly common in 
Europe and are costly to defend. For example, in 2021, anonymous parties initiated opposition proceedings in the European Patent 
Office  ("EPO")  against  our  European  Patent  No.  2,944,306  (which  concerns  pre-filled  syringes  comprising  ophthalmic 
formulations  containing  VEGF  antagonists  such  as  aflibercept  for  intravitreal  administration),  as  described  in  Note  16  to  our 
Consolidated Financial Statements included in this report. We have pending patent applications in the United States Patent and 
Trademark Office (the "USPTO"), the EPO, and the patent offices of other foreign jurisdictions, and it is likely that we will need 
to  defend  patents  from  challenges  by  others  from  time  to  time  in  the  future.  Our  patent  rights  may  not  provide  us  with  a 
proprietary  position  or  competitive  advantages  against  competitors.  Furthermore,  even  if  the  outcome  is  favorable  to  us,  the 
enforcement of our intellectual property rights can be extremely expensive and time consuming.

Changes in either the patent laws or their interpretation in the United States and other countries may diminish our ability to protect 
our inventions or our ability to obtain, maintain, and enforce our intellectual property rights. Any such changes could also affect 
the value of our intellectual property or narrow the scope of our patents. We cannot be certain that our intellectual property rights 
related to any current or future product or product candidate or technology would not be eliminated, narrowed, or weakened by 
any such change or other rulemaking.

Additionally, the United States and other government actions related to Russia's invasion of Ukraine may limit or prevent filing, 
prosecution, and maintenance of patent applications in Russia. These actions could result in abandonment or lapse of our patents 
or patent applications, resulting in partial or complete loss of patent rights in Russia. Further, a decree was adopted by the Russian 
government in March 2022, allowing Russian companies and individuals to exploit inventions owned by patent holders from the 
United States without consent or compensation. Consequently, we would not be able to prevent third parties from practicing our 
inventions in Russia or from selling or importing products made using our inventions in and into Russia.

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We  also  currently  hold  issued  trademark  registrations  and  have  trademark  applications  pending  in  the  United  States  and  other 
jurisdictions, any of which may be the subject of a governmental or third-party objection, which could prevent the maintenance or 
issuance  of  the  trademark.  As  our  products  mature,  our  reliance  on  our  trademarks  to  differentiate  us  from  our  competitors 
increases and as a result, if we are unable to prevent third parties from adopting, registering, or using trademarks that infringe, 
dilute or otherwise violate our trademark rights, our business could be adversely affected. 

We may be restricted in our development, manufacturing, and/or commercialization activities by patents or other proprietary 
rights of others, and could be subject to awards of damages if we are found to have infringed such patents or rights.

Our commercial success depends significantly on our ability to operate without infringing the patents and other proprietary rights 
of others (including those relating to trademarks, copyrights, and trade secrets). Other parties may allege that they own blocking 
patents to our products in clinical development or even to products that have received regulatory approval and are being or have 
been  commercialized,  either  because  they  claim  to  hold  proprietary  rights  to  the  composition  of  a  product  or  the  way  it  is 
manufactured or the way it is used. Moreover, other parties may allege that they have blocking patents to antibody-based products 
made  using  our  VelocImmune  technology,  or  any  other  of  our  technologies,  either  because  of  the  way  the  antibodies  are 
discovered or produced or because of a proprietary composition covering an antibody or the antibody's target.

We have been in the past, are currently, and may in the future be involved in patent litigation and other proceedings involving 
patents and other intellectual property. For example, we are currently party to patent infringement and other proceedings relating 
to EYLEA, as described in Note 16 to our Consolidated Financial Statements.

We  are  aware  of  patents  and  pending  patent  applications  owned  by  others  that  claim  compositions  and  methods  of  treatment 
relating  to  targets  and  conditions  that  we  are  also  pursuing  with  our  products  and/or  product  candidates.  Although  we  do  not 
believe  that  any  of  our  products  or  our  late-stage  product  candidates  infringe  any  valid  claim  in  these  patents  or  patent 
applications, these other parties could initiate lawsuits for patent infringement and assert that their patents are valid and cover our 
products or our late-stage product candidates, similar to the patent infringement proceedings referred to above. Further, we are 
aware  of  a  number  of  patent  applications  of  others  that,  if  granted  with  claims  as  currently  drafted,  may  cover  our  current  or 
planned  activities.  It  could  be  determined  that  our  products  and/or  actions  in  manufacturing  or  selling  our  products  or  product 
candidates infringe such patents.

Patent holders could assert claims against us for damages and seek to prevent us from manufacturing, selling, or developing our 
products or product candidates, and a court may find that we are infringing validly issued patents of others. In the event that the 
manufacture, use, or sale of any of our products or product candidates infringes on the patents or violates other proprietary rights 
of others, we may be prevented from pursuing product development, manufacturing, and commercialization of those drugs and 
may  be  required  to  pay  costly  damages.  In  addition,  in  the  event  that  we  assert  our  patent  rights  against  other  parties  that  we 
believe are infringing our patent rights, such parties may challenge the validity of our patents and we may become the target of 
litigation, which may result in an outcome that is unfavorable to us. Any of these adverse developments may materially harm our 
business,  prospects,  operating  results,  and  financial  condition.  In  any  event,  legal  disputes  are  likely  to  be  costly  and  time 
consuming to defend.

We seek to obtain licenses to patents when, in our judgment, such licenses are needed or advisable. For example, in 2018, we and 
Sanofi entered into a license agreement with Bristol-Myers Squibb, E. R. Squibb & Sons, and Ono Pharmaceutical to obtain a 
license under certain patents owned and/or exclusively licensed by one or more of these parties that includes the right to develop 
and sell Libtayo. If any licenses are required, we may not be able to obtain such licenses on commercially reasonable terms, if at 
all. The failure to obtain any such license could prevent us from developing or commercializing any one or more of our products 
or product candidates, which could severely harm our business.

In  addition,  other  parties  may  have  regulatory  exclusivity  in  the  United  States  or  foreign  jurisdictions  for  products  relating  to 
targets or conditions we are also pursuing, which could prevent or delay our ability to apply for or obtain regulatory approval for 
our  product  candidates  in  such  jurisdictions.  For  example,  in  the  EU,  a  designated  orphan  drug  is  provided  up  to  10  years  of 
market  exclusivity  in  the  orphan  indication,  during  which  time  the  EMA  is  generally  precluded  from  accepting  a  MAA  for  a 
similar  medicinal  product  unless  it  can  be  demonstrated  that  it  is  safer,  more  effective,  or  otherwise  clinically  superior  to  the 
original orphan medicinal product.

Loss or limitation of patent rights, and regulatory pathways for biosimilar competition, could reduce the duration of market 
exclusivity for our products.

In the pharmaceutical and biotechnology industries, the majority of an innovative product's commercial value is usually realized 
during  the  period  in  which  it  has  market  exclusivity.  In  the  United  States  and  some  other  countries,  when  market  exclusivity 
expires and generic versions of a product are approved and marketed, there usually are very substantial and rapid declines in the 
product's sales.

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If  our  late-stage  product  candidates  or  other  clinical  candidates  are  approved  for  marketing  in  the  United  States  or  elsewhere, 
market exclusivity for those products will generally be based upon patent rights and/or certain regulatory forms of exclusivity. As 
described above under "If we cannot protect the confidentiality of our trade secrets, or our patents or other means of defending 
our intellectual property are insufficient to protect our proprietary rights, our business and competitive position will be harmed," 
the  scope  and  enforceability  of  our  patent  rights  may  vary  from  country  to  country.  The  failure  to  obtain  patent  and  other 
intellectual property rights, or limitations on the use, or the loss, of such rights could materially harm us. Absent patent protection 
or regulatory exclusivity for our products, it is possible, both in the United States and elsewhere, that generic, biosimilar, and/or 
interchangeable  versions  of  those  products  may  be  approved  and  marketed,  which  would  likely  result  in  substantial  and  rapid 
reductions in revenues from sales of those products.

Under the PPACA, there is an abbreviated path in the United States for regulatory approval of products that are demonstrated to 
be  "biosimilar"  or  "interchangeable"  with  an  FDA-approved  biological  product.  The  PPACA  provides  a  regulatory  mechanism 
that  allows  for  FDA  approval  of  biologic  drugs  that  are  similar  to  innovative  drugs  on  the  basis  of  less  extensive  data  than  is 
required by a full BLA. Under this regulation, an application for approval of a biosimilar may be filed four years after approval of 
the innovator product. However, qualified innovative biological products receive 12 years of regulatory exclusivity, meaning that 
the FDA may not approve a biosimilar version until 12 years after the innovative biological product was first approved by the 
FDA. However, the term of regulatory exclusivity may not remain at 12 years in the United States and could be shortened if, for 
example, the PPACA is amended.

A  number  of  jurisdictions  outside  the  United  States  have  also  established  abbreviated  pathways  for  regulatory  approval  of 
biological  products  that  are  biosimilar  to  earlier  versions  of  biological  products.  For  example,  the  EU  has  had  an  established 
regulatory pathway for biosimilars since 2005.

The increased likelihood of biosimilar competition has increased the risk of loss of innovators' market exclusivity. It is also not 
possible to predict changes in United States regulatory law that might reduce biological product regulatory exclusivity. Due to this 
risk, and uncertainties regarding patent protection, it is not possible to predict the length of market exclusivity for any particular 
product we currently or may in the future commercialize with certainty based solely on the expiration of the relevant patent(s) or 
the current forms of regulatory exclusivity. A biosimilar version of EYLEA was recently approved in the EU and we are aware of 
several  other  companies  developing  biosimilar  versions  of  EYLEA,  as  discussed  further  under  "Risks  Related  to 
Commercialization  of  Our  Marketed  Products,  Product  Candidates,  and  New  Indications  for  Our  Marketed  Products  -  The 
commercial success of our products and product candidates is subject to significant competition - Marketed Products" above. In 
the  United  States,  the  regulatory  exclusivity  period  for  EYLEA  (i.e.,  the  period  during  which  no  biosimilar  product  can  be 
approved  by  the  FDA)  extends  through  May  17,  2024  following  the  pediatric  exclusivity  granted  by  the  FDA.  In  addition,  as 
EYLEA HD does not benefit from regulatory exclusivity in the United States, market exclusivity for EYLEA HD in the United 
States  is  based  solely  on  our  patent  rights  pertaining  to  this  product  (which  are  subject  to  the  risks  and  uncertainties  discussed 
above  under  "If  we  cannot  protect  the  confidentiality  of  our  trade  secrets,  or  our  patents  or  other  means  of  defending  our 
intellectual property are insufficient to protect our proprietary rights, our business and competitive position will be harmed."). 
The  loss  of  market  exclusivity  for  a  product  (such  as  EYLEA  or  EYLEA  HD)  would  likely  negatively  affect  revenues  from 
product  sales  of  that  product  and  thus  our  financial  results  and  condition  and  could  have  a  material  negative  impact  on  our 
business.

Risks Related to Manufacturing and Supply

We rely on limited internal and contracted manufacturing and supply chain capacity, which could adversely affect our ability 
to commercialize our marketed products and, if approved, our product candidates and to advance our clinical pipeline.

We have large-scale manufacturing operations in Rensselaer, New York and Limerick, Ireland. Manufacturing facilities operated 
by  us  and  by  third-party  contract  manufacturers  engaged  by  us  would  be  inadequate  to  produce  the  active  pharmaceutical 
ingredients  of  our  current  marketed  products  and  our  product  candidates  in  sufficient  clinical  quantities  if  our  clinical  pipeline 
advances as planned or if there is greater demand than currently expected for our marketed products. In addition to expanding our 
internal  capacity,  we  intend  to  continue  to  rely  on  our  collaborators,  and  may  also  rely  on  contract  manufacturers,  to  produce 
commercial  quantities  of  drug  material  needed  for  commercialization  of  our  products.  As  we  increase  our  production  in 
anticipation  of  potential  regulatory  approval  for  our  product  candidates,  our  current  manufacturing  capacity  will  likely  not  be 
sufficient, and our dependence on our collaborators and/or contract manufacturers may increase, to produce adequate quantities of 
drug material for both commercial and clinical purposes. The COVID-19 pandemic has exacerbated and may in the future further 
exacerbate  certain  of  these  risks.  For  example,  the  impact  of  prioritizing  certain  manufacturing-related  resources  for  our 
COVID-19  monoclonal  antibodies  has  included  and  may  in  the  future  include,  among  other  things,  drawing  down  inventory 
safety stock levels for certain of our other products (including Dupixent and EYLEA). Depending on the demand for our products 
and other relevant factors, we may not be able to replenish our inventory safety stock to the levels we deem prudent or supply our 
products and product candidates in sufficient quantities to satisfy our commercial and development needs. We also rely entirely 

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on other parties and our collaborators for filling and finishing services. Generally, in order for other parties to perform any step in 
the manufacturing and supply chain, we must transfer technology to the other party, which can be time consuming and may not be 
successfully  accomplished  without  considerable  cost  and  expense,  or  at  all.  We  will  have  to  depend  on  these  other  parties  to 
perform effectively on a timely basis and to comply with regulatory requirements. If for any reason they are unable to do so, and 
as a result we are unable to directly or through other parties manufacture and supply sufficient commercial and clinical quantities 
of  our  products  on  acceptable  terms,  or  if  we  should  encounter  delays  or  other  difficulties  with  our  collaborators,  contract 
manufacturers, warehouses, shipping, testing laboratories, or other parties involved in our supply chain which adversely affect the 
timely  manufacture  and  supply  of  our  products  or  product  candidates,  our  business,  prospects,  operating  results,  and  financial 
condition may be materially harmed.

Expanding our manufacturing capacity and establishing fill/finish capabilities will be costly and we may be unsuccessful in 
doing  so  in  a  timely  manner,  which  could  delay  or  prevent  the  launch  and  successful  commercialization  of  our  marketed 
products and product candidates or other indications for our marketed products if they are approved for marketing and could 
jeopardize our current and future clinical development programs.

In  addition  to  our  existing  manufacturing  facilities  in  Rensselaer,  New  York  and  Limerick,  Ireland,  we  may  lease,  operate, 
purchase, or construct additional facilities to conduct expanded manufacturing or other related activities in the future. Expanding 
our manufacturing capacity to supply commercial quantities of the active pharmaceutical ingredients for our marketed products 
and  our  product  candidates  if  they  are  approved  for  marketing,  and  to  supply  clinical  drug  material  to  support  the  continued 
growth  of  our  clinical  programs,  will  require  substantial  additional  expenditures,  time,  and  various  regulatory  approvals  and 
permits. This also holds true for establishing fill/finish capabilities in the future, for which we have constructed a fill/finish facility 
in Rensselaer, New York that is currently undergoing process validation as required by regulatory authorities (refer to Part II, Item 
7. "Management's Discussion and Analysis of Financial Condition and Results of Operations – Liquidity and Capital Resources" 
for information about expected capital expenditures relating to this and other projects). In addition, we may need to develop or 
acquire additional manufacturing capabilities to the extent we or our collaborators pursue the development of drugs generated by 
means other than our existing "Trap" or VelociSuite® technologies, such as siRNA gene silencing, genome editing, and targeted 
viral-based gene delivery and expression. Further, we will need to hire and train significant numbers of employees and managerial 
personnel to staff our expanding manufacturing and supply chain operations, as well as any future fill/finish activities. Start-up 
costs can be large, and scale-up entails significant risks related to process development and manufacturing yields. In addition, we 
may  face  difficulties  or  delays  in  developing  or  acquiring  the  necessary  production  equipment  and  technology  to  manufacture 
sufficient quantities of our product candidates at reasonable costs and in compliance with applicable regulatory requirements. The 
FDA and analogous foreign regulatory authorities must determine that our existing and any expanded manufacturing facilities and 
any  future  fill/finish  activities  comply,  or  continue  to  comply,  with  cGMP  requirements  for  both  clinical  and  commercial 
production  and  license  them,  or  continue  to  license  them,  accordingly,  and  such  facilities  must  also  comply  with  applicable 
environmental, safety, and other governmental permitting requirements. We may not successfully expand or establish sufficient 
manufacturing or any future fill/finish capabilities or manufacture our products economically or in compliance with cGMPs and 
other regulatory requirements, and we and our collaborators may not be able to build or procure additional capacity in the required 
timeframe to meet commercial demand for our product candidates if they receive regulatory approval, and to continue to meet the 
requirements of our clinical programs. This would interfere with our efforts to successfully commercialize our marketed products, 
and it could also delay or require us to discontinue one or more of our clinical development programs. As a result, our business, 
prospects, operating results, and financial condition could be materially harmed.

Our  ability  to  manufacture  products  may  be  impaired  if  any  of  our  or  our  collaborators'  manufacturing  activities,  or  the 
activities of other third parties involved in our manufacture and supply chain, are found to infringe patents of others.

Our ability to continue to manufacture products in our Rensselaer, New York and Limerick, Ireland facilities and at additional 
facilities  (if  any)  in  the  future  (including  our  ability  to  conduct  any  fill/finish  activities  in  the  future),  the  ability  of  our 
collaborators to manufacture products at their facilities, and our ability to utilize other third parties to produce our products, to 
supply  raw  materials  or  other  products,  or  to  perform  fill/finish  services  or  other  steps  in  our  manufacture  and  supply  chain, 
depends  on  our  and  their  ability  to  operate  without  infringing  the  patents  or  other  intellectual  property  rights  of  others.  Other 
parties may allege that our or our collaborators' manufacturing activities, or the activities of other third parties involved in our 
manufacture  and  supply  chain  (which  may  be  located  in  jurisdictions  outside  the  United  States),  infringe  patents  or  other 
intellectual  property  rights.  For  example,  we  are  currently  party  to  patent  infringement  and  other  proceedings  relating  to  the 
EYLEA pre-filled syringe, as described in Note 16 to our Consolidated Financial Statements. A judicial or regulatory decision in 
favor  of  one  or  more  parties  making  such  allegations  could  directly  or  indirectly  preclude  the  manufacture  of  our  products  to 
which  those  intellectual  property  rights  apply  on  a  temporary  or  permanent  basis,  which  could  materially  harm  our  business, 
prospects, operating results, and financial condition.

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If sales of our marketed products do not meet the levels currently expected, or if the launch of any of our product candidates is 
delayed or unsuccessful, we may face costs related to excess inventory or unused capacity at our manufacturing facilities and 
at the facilities of third parties or our collaborators.

We  use  our  manufacturing  facilities  primarily  to  produce  bulk  product  for  commercial  supply  of  our  marketed  products  and 
clinical and preclinical candidates for ourselves and our collaborations. We also plan to use such facilities to produce bulk product 
for  commercial  supply  of  new  indications  of  our  marketed  products  and  new  product  candidates  if  they  are  approved  for 
marketing or otherwise authorized for use. If our clinical candidates are discontinued or their clinical development is delayed, if 
the  launch  of  new  indications  for  our  marketed  products  or  new  product  candidates  is  delayed  or  does  not  occur,  or  if  such 
products are launched and the launch is unsuccessful or the product is subsequently recalled or marketing approval is rescinded, 
we may have to absorb one hundred percent of related overhead costs and inefficiencies, as well as similar costs of third-party 
contract manufacturers performing services for us. In addition, if we or our collaborators experience excess inventory, it may be 
necessary to write down or write off such excess inventory or incur an impairment charge with respect to the facility where such 
product  is  manufactured,  which  could  adversely  affect  our  operating  results.  For  example,  during  each  of  the  years  ended 
December 31, 2022 and 2021, we recorded a charge to write down inventory related to REGEN-COV.

Third-party service or supply failures, or other failures, business interruptions, or other disasters affecting our manufacturing 
facilities in Rensselaer, New York and Limerick, Ireland, the manufacturing facilities of our collaborators, or the facilities of 
any other party participating in the supply chain, would adversely affect our ability to supply our products.

Bulk drug materials are currently manufactured at our manufacturing facilities in Rensselaer, New York and Limerick, Ireland, as 
well as at our collaborators' facilities. We and our collaborators would be unable to manufacture these materials if the relevant 
facility  were  to  cease  production  due  to  regulatory  requirements  or  actions,  business  interruptions,  labor  shortages  or  disputes, 
supply  chain  interruptions  or  constraints  (including  with  respect  to  natural  gas  and  other  raw  materials),  contaminations,  fire, 
climate change, natural disasters, acts of war or terrorism, or other problems.

Many  of  our  products  and  product  candidates  are  very  difficult  to  manufacture.  As  our  products  and  most  of  our  product 
candidates  are  biologics,  they  require  processing  steps  that  are  more  difficult  than  those  required  for  many  other  chemical 
pharmaceuticals.  Accordingly,  multiple  steps  are  needed  to  control  the  manufacturing  processes.  Problems  with  these 
manufacturing processes, even minor deviations from the normal process or from the materials used in the manufacturing process 
(which  may  not  be  detectable  by  us  or  our  collaborators  in  a  timely  manner),  could  lead  to  product  defects  or  manufacturing 
failures, resulting in lot failures, product recalls, product liability claims, and insufficient inventory. Also, the complexity of our 
manufacturing process may make it difficult, time-consuming, and expensive to transfer our technology to our collaborators or 
contract manufacturers.

Certain  raw  materials  or  other  products  necessary  for  the  manufacture  and  formulation  of  our  marketed  products  and  product 
candidates, some of which are difficult to source, are provided by single-source unaffiliated third-party suppliers. In addition, we 
rely on certain third parties or our collaborators to perform filling, finishing, distribution, laboratory testing, and other services 
related  to  the  manufacture  of  our  marketed  products  and  product  candidates,  and  to  supply  various  raw  materials  and  other 
products. We would be unable to obtain these raw materials, other products, or services for an indeterminate period of time if any 
of these third parties were to cease or interrupt production or otherwise fail to supply these materials, products, or services to us 
for  any  reason,  including  due  to  regulatory  requirements  or  actions  (including  recalls),  adverse  financial  developments  at  or 
affecting the supplier, failure by the supplier to comply with cGMPs, contaminations, business interruptions, or labor shortages or 
disputes  (in  each  case,  including  as  a  result  of  the  COVID-19  pandemic  and  the  armed  conflict  between  Russia  and  Ukraine, 
which  have  exacerbated  many  of  these  issues,  or  other  public  health  outbreaks,  epidemics,  or  pandemics  or  geopolitical 
developments). In any such circumstances, we may not be able to engage a backup or alternative supplier or service provider in a 
timely  manner  or  at  all.  This,  in  turn,  could  materially  and  adversely  affect  our  or  our  collaborators'  ability  to  manufacture  or 
supply marketed products and product candidates, which could materially and adversely affect our business and future prospects.

Certain of the raw materials required in the manufacture and testing of our products and product candidates may be derived from 
biological  sources,  including  mammalian  tissues,  bovine  serum,  and  human  serum  albumin.  There  are  certain  regulatory 
restrictions  on  using  these  biological  source  materials.  If  we  or  our  collaborators  are  required  to  substitute  for  these  sources  to 
comply with such regulatory requirements, our clinical development or commercial activities may be delayed or interrupted.

Our or our collaborators' failure to meet the stringent requirements of governmental regulation in the manufacture of drug 
products or product candidates could result in incurring substantial remedial costs, delays in the development or approval of 
our product candidates or new indications for our marketed products and/or in their commercial launch if regulatory approval 
is obtained, and a reduction in sales.

We  and  our  collaborators  and  other  third-party  providers  are  required  to  maintain  compliance  with  cGMPs,  and  are  subject  to 
inspections  by  the  FDA  or  comparable  agencies  in  other  jurisdictions  to  confirm  such  compliance.  Changes  of  suppliers  or 

57

modifications  of  methods  of  manufacturing  may  require  amending  our  application(s)  to  the  FDA  or  such  comparable  foreign 
agencies and acceptance of the change by the FDA or such comparable foreign agencies prior to release of product(s). Because we 
produce  multiple  products  and  product  candidates  at  our  facilities  in  Rensselaer,  New  York  and  Limerick,  Ireland,  there  are 
increased risks associated with cGMP compliance. Our inability, or the inability of our collaborators and third-party fill/finish or 
other  service  providers,  to  demonstrate  ongoing  cGMP  compliance  could  require  us  to  engage  in  lengthy  and  expensive 
remediation  efforts,  withdraw  or  recall  product,  halt  or  interrupt  clinical  trials,  and/or  interrupt  commercial  supply  of  any 
marketed  products,  and  could  also  delay  or  prevent  our  obtaining  regulatory  approval  for  our  product  candidates  or  new 
indications for our marketed products. Any delay, interruption, or other issue that arises in the manufacture, fill/finish, packaging, 
or storage of any drug product or product candidate as a result of a failure of our facilities or the facilities or operations of our 
collaborators  or  other  third  parties  to  pass  any  regulatory  agency  inspection  or  maintain  cGMP  compliance  could  significantly 
impair our ability to develop, obtain approval for, and successfully commercialize our products, which would substantially harm 
our business, prospects, operating results, and financial condition. Any finding of non-compliance could also increase our costs, 
cause  us  to  delay  the  development  of  our  product  candidates,  result  in  delay  in  our  obtaining,  or  our  not  obtaining,  regulatory 
approval of product candidates or new indications for our marketed products, and cause us to lose revenue from any marketed 
products, which could be seriously detrimental to our business, prospects, operating results, and financial condition. For example, 
in June 2023, the FDA issued a CRL concerning the Company's BLA for EYLEA HD for the treatment of wAMD, DME, and DR 
due  to  unresolved  observations  resulting  from  an  inspection  at  a  third-party  fill/finish  provider,  the  contract  manufacturing 
organization  Catalent,  which  resulted  in  a  delay  of  the  FDA  approval  of  EYLEA  HD  by  nearly  two  months.  Significant 
noncompliance  with  the  requirements  discussed  in  this  paragraph  could  also  result  in  the  imposition  of  monetary  penalties  or 
other civil or criminal sanctions and damage our reputation. 

Other Regulatory and Litigation Risks

If  the  testing  or  use  of  our  products  harms  people,  or  is  perceived  to  harm  them  even  when  such  harm  is  unrelated  to  our 
products, we could be subject to costly and damaging product liability claims.

The  testing,  manufacturing,  marketing,  and  sale  of  drugs  for  use  in  people  expose  us  to  product  liability  risk.  Any  informed 
consent or waivers obtained from people who enroll in our clinical trials may not protect us from liability or the cost of litigation. 
We  may  also  be  subject  to  claims  by  patients  who  use  our  approved  products,  or  our  product  candidates  if  those  product 
candidates receive regulatory approval and become commercially available, that they have been injured by a side effect associated 
with  the  drug.  Even  in  a  circumstance  in  which  we  do  not  believe  that  an  adverse  event  is  related  to  our  products  or  product 
candidates, the related investigation may be time consuming or inconclusive and may have a negative impact on our reputation or 
business. We may face product liability claims and be found responsible even if injury arises from the acts or omissions of third 
parties who provide fill/finish or other services. To the extent we maintain product liability insurance in relevant periods, such 
insurance  may  not  cover  all  potential  liabilities  or  may  not  completely  cover  any  liability  arising  from  any  such  litigation. 
Moreover, in the future we may not have access to liability insurance or be able to maintain our insurance on acceptable terms.

Our  business  activities  have  been,  and  may  in  the  future  be,  challenged  under  U.S.  federal  or  state  and  foreign  healthcare 
laws, which may subject us to civil or criminal proceedings, investigations, or penalties.

The FDA regulates the marketing and promotion of our products, which must comply with the Food, Drug, and Cosmetic Act and 
applicable FDA implementing standards. The FDA's review of promotional activities includes healthcare provider-directed and 
direct-to-consumer  advertising,  communications  regarding  unapproved  uses,  industry-sponsored  scientific  and  educational 
activities, and sales representatives' communications. Failure to comply with applicable FDA requirements and restrictions in this 
area may subject a company to adverse enforcement action by the FDA, the Department of Justice, or the Office of the Inspector 
General of the HHS, as well as state authorities. This could subject a company to a range of penalties that could have a significant 
commercial  impact,  including  civil  and  criminal  fines  and  agreements  that  materially  restrict  the  manner  in  which  a  company 
promotes or distributes a drug. Any such failures could also cause significant reputational harm. The FDA may take enforcement 
action  for  promoting  unapproved  uses  of  a  product  or  other  violations  of  its  advertising  laws  and  regulations.  The  applicable 
regulations  in  countries  outside  the  U.S.  grant  similar  powers  to  the  competent  authorities  and  impose  similar  obligations  on 
companies.

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In addition to FDA and related regulatory requirements, we are subject to health care "fraud and abuse" laws, such as the federal 
civil  False  Claims  Act,  the  anti-kickback  provisions  of  the  federal  Social  Security  Act,  and  other  state  and  federal  laws  and 
regulations. The U.S. federal healthcare program anti-kickback statute (the "AKS") prohibits, among other things, knowingly and 
willfully  offering,  paying,  soliciting,  or  receiving  payments  or  other  remuneration,  directly  or  indirectly,  to  induce  or  reward 
someone  to  purchase,  prescribe,  endorse,  arrange  for,  or  recommend  a  product  or  service  that  is  reimbursed  under  federal 
healthcare programs such as Medicare or Medicaid. If we provide payments or other remuneration to a healthcare professional to 
induce the prescribing of our products, we could face liability under state and federal anti-kickback laws. The Bipartisan Budget 
Act  of  2018  has  increased  the  criminal  and  civil  penalties  that  can  be  imposed  for  violating  certain  federal  health  care  laws, 
including the federal anti-kickback statute.

The  federal  civil  False  Claims  Act  prohibits  any  person  from,  among  other  things,  knowingly  presenting,  or  causing  to  be 
presented, a false claim for payment to the federal government, or knowingly making, or causing to be made, a false statement to 
get  a  false  claim  paid.  The  False  Claims  Act  also  permits  a  private  individual  acting  as  a  "whistleblower"  to  bring  actions  on 
behalf  of  the  federal  government  alleging  violations  of  the  statute  and  to  share  in  any  monetary  recovery.  Pharmaceutical 
companies  have  been  investigated  and/or  prosecuted  under  these  laws  for  a  variety  of  alleged  promotional  and  marketing 
activities,  such  as  allegedly  providing  free  product  to  customers  with  the  expectation  that  the  customers  would  bill  federal 
programs for the product; reporting to pricing services inflated average wholesale prices that were then used by federal programs 
to set reimbursement rates; engaging in promotion for uses that the FDA has not approved, known as off-label uses, that caused 
claims to be submitted to Medicaid for non-covered off-label uses; and submitting inflated best price information to the Medicaid 
Rebate  program.  Pharmaceutical  and  other  healthcare  companies  also  are  subject  to  other  federal  false  claims  laws,  including, 
among others, federal criminal fraud and false statement statutes that extend to non-government health benefit programs.

The majority of states also have statutes or regulations similar to the federal anti-kickback law and false claims laws, which apply 
to  items  and  services  reimbursed  under  Medicaid  and  other  state  programs,  or,  in  several  states,  apply  regardless  of  the  payor. 
Sanctions  under  these  federal  and  state  laws  may  include  civil  monetary  penalties,  damages,  exclusion  of  a  manufacturer's 
products from reimbursement under government programs, criminal fines, and imprisonment for individuals and the curtailment 
or restructuring of operations. Even if it is determined that we have not violated these laws, government investigations into these 
issues typically require the expenditure of significant resources and generate negative publicity, which would harm our business, 
prospects, operating results, and financial condition. Because of the breadth of these laws and the narrowness of the safe harbors, 
it is possible that some of our business activities could be challenged under one or more of such laws. As described further in 
Note 16 to our Consolidated Financial Statements included in this report, we are party to civil litigation initiated in 2020 by the 
U.S. Attorney's Office for the District of Massachusetts concerning our support of a 501(c)(3) organization that provides financial 
assistance  to  patients;  and  we  are  cooperating  with  pending  government  investigations  concerning  certain  other  business 
activities. Any adverse decision, finding, allegation, or exercise of enforcement or regulatory discretion in any such proceedings 
or investigations could harm our business, prospects, operating results, and financial condition.

As part of the PPACA, the federal government requires that pharmaceutical manufacturers record any "transfers of value" made to 
U.S.  licensed  physicians  and  teaching  hospitals  as  well  as  ownership  and  investment  interests  held  by  physicians  and  their 
immediate  family  members.  Information  provided  by  companies  is  aggregated  and  posted  annually  on  an  "Open  Payments" 
website,  which  is  managed  by  CMS,  the  agency  responsible  for  implementing  these  disclosure  requirements.  Applicable 
manufacturers also are required to report information regarding payments and transfers of value provided to physician assistants, 
nurse practitioners, clinical nurse specialists, certified nurse anesthetists, anesthesiologist assistants, and certified nurse-midwives. 
We  also  have  similar  reporting  obligations  in  other  countries  based  on  laws,  regulations,  and/or  industry  trade  association 
requirements.

We  continue  to  dedicate  significant  resources  to  comply  with  these  requirements  and  need  to  be  prepared  to  comply  with 
additional  reporting  obligations  outside  the  United  States.  In  addition,  several  states  have  legislation  requiring  pharmaceutical 
companies to establish marketing compliance programs, file periodic reports with the state, or make periodic public disclosures on 
sales, marketing, pricing, clinical trials, and other activities; restrict when pharmaceutical companies may provide meals or gifts to 
prescribers or engage in other marketing-related activities; require identification or licensing of sales representatives; and restrict 
the  ability  of  manufacturers  to  offer  co-pay  support  to  patients  for  certain  prescription  drugs.  Many  of  these  requirements  and 
standards are new or uncertain, and the penalties for failure to comply with these requirements may be unclear. If we are found 
not  to  be  in  full  compliance  with  these  laws,  we  could  face  enforcement  actions,  fines,  and  other  penalties,  and  could  receive 
adverse publicity, which would harm our business, prospects, operating results, and financial condition. Additionally, access to 
such data by fraud-and-abuse investigators and industry critics may draw scrutiny to our collaborations with reported entities.

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If  we  fail  to  comply  with  our  reporting  and  payment  obligations  under  the  Medicaid  Drug  Rebate  program  or  other 
governmental pricing programs, we could be subject to additional reimbursement requirements, penalties, sanctions and fines, 
which could have a material adverse effect on our business, financial condition, results of operations, and future prospects.

We participate in the Medicaid Drug Rebate program, the 340B program (which is administered by HRSA), the VA FSS pricing 
program, the Tricare Retail Pharmacy Program, and other federal and state government pricing programs. Such programs often 
require  us  to  provide  discounts  and/or  pay  rebates  to  certain  government  payors  and/or  private  purchasers.  See  Part  I,  Item  1, 
"Business - Government Regulation - Pricing and Reimbursement" for additional information on these programs.

Pricing  and  rebate  calculations  vary  across  products  and  programs,  are  complex,  and  are  often  subject  to  interpretation  by  us, 
governmental or regulatory agencies, and the courts. Such interpretation can change and evolve over time. For example, in the 
case of our Medicaid pricing data, if we become aware that our reporting for a prior quarter was incorrect, or has changed as a 
result of recalculation of the pricing data, we are obligated to resubmit the corrected data for up to three years after those data 
originally  were  due.  Such  restatements  and  recalculations  increase  our  costs  for  complying  with  the  laws  and  regulations 
governing the Medicaid Drug Rebate program and could result in an overage or underage in our rebate liability for past quarters. 
Price recalculations also may affect the ceiling price at which we are required to offer our products under the 340B program.

Civil monetary penalties can be applied if we fail to pay the required rebate, if we are found to have knowingly submitted any 
false price or product information to the government, if we are found to have made a misrepresentation in the reporting of our 
average  sales  price,  if  we  fail  to  submit  the  required  price  data  on  a  timely  basis,  or  if  we  are  found  to  have  knowingly  and 
intentionally charged 340B covered entities more than the statutorily mandated ceiling price. CMS could also decide to terminate 
our  Medicaid  drug  rebate  agreement,  or  HRSA  could  decide  to  terminate  our  340B  program  participation  agreement,  in  which 
case federal payments may not be available under Medicaid or Medicare Part B for our covered outpatient drugs.

Our  failure  to  comply  with  our  reporting  and  payment  obligations  under  the  Medicaid  Drug  Rebate  program  and  other 
governmental programs could negatively impact our financial results. The final regulation governing the Medicaid Drug Rebate 
program issued by CMS has increased and will continue to increase our costs and the complexity of compliance, has been and 
will  continue  to  be  time-consuming  to  implement,  and  could  have  a  material  adverse  effect  on  our  results  of  operations, 
particularly if CMS challenges the approach we have taken in our implementation of the final regulation. Other regulations and 
coverage expansion by various governmental agencies relating to the Medicaid Drug Rebate program may have a similar impact.

In addition, the final regulation issued by HRSA regarding the calculation of the 340B ceiling price and the imposition of civil 
monetary  penalties  on  manufacturers  that  knowingly  and  intentionally  overcharge  covered  entities  has  affected  our  obligations 
and potential liability under the 340B program. We are also required to report the 340B ceiling prices for our covered outpatient 
drugs  to  HRSA,  which  then  publishes  them  to  340B  covered  entities.  Any  charge  by  HRSA  that  we  have  violated  the 
requirements of the program or the regulation could negatively impact our financial results. Moreover, HRSA established an ADR 
process  for  claims  by  covered  entities  that  a  manufacturer  has  engaged  in  overcharging,  and  by  manufacturers  that  a  covered 
entity violated the prohibitions against diversion or duplicate discounts. Such claims are to be resolved through an ADR panel of 
government officials rendering a decision that could be appealed only in federal court. An ADR proceeding could subject us to 
onerous  procedural  requirements  and  could  result  in  additional  liability.  On  November  30,  2022,  HRSA  issued  a  notice  of 
proposed rulemaking that proposes several changes to the ADR process; and, following the solicitation of public comments, in 
October  2023  HRSA  submitted  a  final  version  of  the  rule  to  the  White  House  Office  of  Management  and  Budget  for  review. 
Further, any additional future changes to the definition of average manufacturer price and the Medicaid rebate amount under the 
PPACA or otherwise could affect our 340B ceiling price calculations and negatively impact our results of operations.  

We have obligations to report the average sales price for certain of our drugs to the Medicare program. Statutory or regulatory 
changes or CMS guidance could affect the average sales price calculations for our products and the resulting Medicare payment 
rate, and could negatively impact our results of operations.

Manufacturers  must  pay  refunds  to  Medicare  for  single-source  drugs  or  biological  products,  or  biosimilar  biological  products, 
reimbursed  under  Medicare  Part  B  and  packaged  in  single-dose  containers  or  single-use  packages  for  units  of  discarded  drug 
reimbursed  by  Medicare  Part  B  in  excess  of  10  percent  of  total  allowed  charges  under  Medicare  Part  B  for  that  drug. 
Manufacturers that fail to pay refunds could be subject to civil monetary penalties of 125 percent of the refund amount.

Pursuant  to  applicable  law,  knowing  provision  of  false  information  in  connection  with  price  reporting  or  contract-based 
requirements under the VA/FSS and/or Tricare programs can subject a manufacturer to civil monetary penalties. These program 
and contract-based obligations also contain extensive disclosure and certification requirements. If we overcharge the government 
in connection with our arrangements with FSS or Tricare, we are required to refund the difference to the government. Failure to 
make necessary disclosures or to identify contract overcharges can result in allegations against us under the False Claims Act and 
other laws and regulations. Unexpected refunds to the government, and/or response to a government investigation or enforcement 

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action, would be expensive and time-consuming, and could have a material adverse effect on our business, financial condition, 
results of operations, and future prospects.

Risks from the improper conduct of employees, agents, contractors, or collaborators could adversely affect our reputation and 
our business, prospects, operating results, and financial condition.

We cannot ensure that our compliance controls, policies, and procedures will in every instance protect us from acts committed by 
our  employees,  agents,  contractors,  or  collaborators  that  would  violate  the  laws  or  regulations  of  the  jurisdictions  in  which  we 
operate,  including,  without  limitation,  healthcare,  employment,  foreign  corrupt  practices,  trade  restrictions  and  sanctions, 
environmental,  competition,  and  privacy  laws  and  regulations.  Such  improper  actions  could  subject  us  to  civil  or  criminal 
investigations,  and  monetary  and  injunctive  penalties,  and  could  adversely  impact  our  ability  to  conduct  business,  operating 
results, and reputation.

In  particular,  our  business  activities  outside  the  United  States  (which  have  recently  increased,  and  are  expected  to  continue  to 
increase,  due  to,  in  part,  our  efforts  to  establish  our  commercialization  and  co-commercialization  capabilities  in  certain 
jurisdictions outside the United States) are subject to the Foreign Corrupt Practices Act, or FCPA, and similar anti-bribery or anti-
corruption laws, regulations or rules of other countries in which we operate, including the U.K. Bribery Act. The FCPA generally 
prohibits offering, promising, giving, or authorizing others to give anything of value, either directly or indirectly, to a non-U.S. 
government official in order to influence official action, or otherwise obtain or retain business. The FCPA also requires public 
companies to make and keep books and records that accurately and fairly reflect the transactions of the corporation and to devise 
and  maintain  an  adequate  system  of  internal  accounting  controls.  Our  business  is  heavily  regulated  and  therefore  involves 
significant interaction with public officials, including officials of non-U.S. governments. Additionally, in many other countries, 
the  health  care  providers  who  prescribe  pharmaceuticals  are  employed  by  their  government,  and  the  purchasers  of 
pharmaceuticals are government entities; therefore, our dealings with these prescribers and purchasers are subject to regulation 
under the FCPA. Recently the SEC and Department of Justice have increased their FCPA enforcement activities with respect to 
pharmaceutical companies. There is no certainty that all of our employees, agents, contractors, or collaborators, or those of our 
affiliates,  will  comply  with  all  applicable  laws  and  regulations,  particularly  given  the  high  level  of  complexity  of  these  laws. 
Violations  of  these  laws  and  regulations  could  result  in  fines,  criminal  sanctions  against  us,  our  officers,  or  our  employees, 
requirements  to  obtain  export  licenses,  cessation  of  business  activities  in  sanctioned  countries,  implementation  of  compliance 
programs, and prohibitions on the conduct of our business. Any such violations could include prohibitions on our ability to offer 
our  products  in  one  or  more  countries  and  could  materially  damage  our  reputation,  our  brand,  our  ability  to  expand 
internationally, our ability to attract and retain employees, and our business, prospects, operating results, and financial condition.

Our  operations  are  subject  to  environmental,  health,  and  safety  laws  and  regulations,  including  those  governing  the  use  of 
hazardous materials. Compliance with these laws and regulations is costly, and we may incur substantial liability arising from 
our activities involving the use of hazardous materials.

As  a  fully  integrated  biotechnology  company  with  significant  research  and  development  and  manufacturing  operations,  we  are 
subject  to  extensive  environmental,  health,  and  safety  laws  and  regulations,  including  those  governing  the  use  of  hazardous 
materials. Our research and development and manufacturing activities involve the controlled use of chemicals, infectious agents 
(such  as  viruses,  bacteria,  and  fungi),  radioactive  compounds,  and  other  hazardous  materials.  The  cost  of  compliance  with 
environmental, health, and safety regulations is substantial. If an accident involving these materials or an environmental discharge 
were to occur, we could be held liable for any resulting damages, or face regulatory actions, which could exceed our resources or 
insurance coverage.

Changes in laws and regulations affecting the healthcare industry could adversely affect our business.

All aspects of our business, including research and development, manufacturing, marketing, pricing, sales, intellectual property 
rights, and the framework for dispute resolution and asserting our rights against others, are subject to extensive legislation and 
regulation. Changes in applicable U.S. federal, state, and foreign laws and agency regulations could have a materially negative 
impact on our business. 

As described above, the PPACA and potential regulations thereunder easing the entry of competing follow-on biologics into the 
marketplace,  other  new  legislation  or  implementation  of  existing  statutory  provisions  on  importation  of  lower-cost  competing 
drugs  from  other  jurisdictions,  and  legislation  on  comparative  effectiveness  research  are  examples  of  previously  enacted  and 
possible  future  changes  in  laws  that  could  adversely  affect  our  business.  In  addition,  in  April  2023,  the  European  Commission 
published a proposal to replace the current pharmaceutical legislative framework in the EU. While it is uncertain whether such 
proposal will be adopted in its current form, there may ultimately be a number of changes to the current regulatory framework in 
the EU, including a reduction of the data protection and market exclusivity periods provided thereby.

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The U.S. federal or state governments could carry out other significant changes in legislation, regulation, or government policy, 
including with respect to government reimbursement changes or drug price control measures (such as those discussed above under 
"Risks  Related  to  Commercialization  of  Our  Marketed  Products,  Product  Candidates,  and  New  Indications  for  Our  Marketed 
Products - Changes to product reimbursement and coverage policies and practices may materially harm our business, prospects, 
operating  results,  and  financial  condition")  or  the  PPACA  or  other  healthcare  reform  laws.  While  it  is  not  possible  to  predict 
whether  and  when  any  such  changes  will  occur,  changes  in  the  laws,  regulations,  and  policies  governing  the  development  and 
approval of our product candidates and the commercialization, importation, and reimbursement of our products could adversely 
affect our business. In addition, our development and commercialization activities could be harmed or delayed by a shutdown of 
the U.S. government, including the FDA. For example, a prolonged shutdown may significantly delay the FDA's ability to timely 
review  and  process  any  submissions  we  have  filed  or  may  file  or  cause  other  regulatory  delays,  which  could  materially  and 
adversely affect our business.

Risks associated with our operations outside the United States could adversely affect our business.

We have operations and conduct business in several countries outside the United States and have been significantly expanding the 
scope  of  these  activities  in  existing  and/or  additional  countries,  including  EU  countries  and  Japan.  For  example,  as  discussed 
above, we are in the process of establishing commercial capabilities related to Libtayo in many jurisdictions outside the United 
States  following  the  2022  amendment  to  the  IO  Collaboration;  and  we  perform  co-commercialization  activities  under  the 
Antibody  Collaboration  related  to  Dupixent  in  certain  jurisdictions  outside  the  United  States.  Consequently,  we  are,  and  will 
continue to be, subject to risks related to operating in countries outside the United States, particularly those in which we have not 
previously established operations, and many of these risks will increase as we expand our activities in such jurisdictions. These 
risks include:

•

•

•

•
•

•
•

unfamiliar foreign laws or regulatory requirements or unexpected changes to those laws or requirements, including those 
with  which  we  and/or  our  collaborators  must  comply  in  order  to  maintain  our  marketing  authorizations  outside  the 
United States, and the cost of compliance with such foreign laws and regulatory requirements;
other laws and regulatory and industry trade association requirements to which our business activities abroad are subject, 
such as the FCPA and the U.K. Bribery Act (discussed in greater detail above under "Risks from the improper conduct of 
employees,  agents,  contractors,  or  collaborators  could  adversely  affect  our  reputation  and  our  business,  prospects, 
operating results, and financial condition"), as well as labor and employment laws and regulations;
changes in the political or economic condition of a specific country or region, including as a result of the Russia-Ukraine 
or Hamas-Israel armed conflict;
fluctuations in the value of foreign currency versus the U.S. dollar;
tariffs,  trade  protection  measures,  import  or  export  licensing  requirements,  trade  embargoes,  and  sanctions  (including 
those  administered  by  the  Office  of  Foreign  Assets  Control  of  the  U.S.  Department  of  the  Treasury),  and  other  trade 
barriers; 
difficulties in attracting and retaining qualified personnel; and 
cultural differences in the conduct of business.

We  have  large-scale  manufacturing  operations  in  Limerick,  Ireland  and  have  also  established  offices  in  the  United  Kingdom, 
Germany,  Japan,  and  other  countries  outside  the  United  States.  Changes  impacting  our  ability  to  conduct  business  in  the  those 
countries, or changes to the regulatory regime applicable to our operations in those countries (such as with respect to the approval 
of  our  product  candidates),  may  materially  and  adversely  impact  our  business,  prospects,  operating  results,  and  financial 
condition.

We may incur additional tax liabilities related to our operations.

We are subject to income tax in the United States and foreign jurisdictions in which we operate. Significant judgment is required 
in  determining  our  worldwide  tax  liabilities,  and  our  effective  tax  rate  is  derived  from  the  applicable  statutory  tax  rates  and 
relative earnings in each taxing jurisdiction. We record liabilities for uncertain tax positions that involve significant management 
judgment as to the application of law. Domestic or foreign taxing authorities have previously disagreed, and may in the future 
disagree, with our interpretation of tax law as applied to the operations of Regeneron and its subsidiaries or with the positions we 
may take with respect to particular tax issues on our tax returns. Consequently, tax assessments or judgments in excess of accrued 
amounts that we have estimated in preparing our financial statements may materially and adversely affect our reported effective 
tax rate or our cash flows. Further, other factors may adversely affect our effective tax rate, including changes in the mix of our 
profitability from country to country, tax effects of stock-based compensation (which depend in part on the price of our stock and, 
therefore,  are  beyond  our  control),  and  changes  in  tax  laws  or  regulations.  For  example,  the  Organization  for  Economic  Co-
operation  and  Development  ("OECD")  Global  Anti-Base  Erosion  Model  Rules  ("Pillar  Two")  have  influenced  tax  laws  in 

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countries in which we operate, including the implementation of minimum taxes. Changes to these or other laws and regulations or 
their interpretations could materially adversely impact our effective tax rate or cash flows.

We face risks related to the personal data we collect, process, and share.

Our  ability  to  conduct  our  business  is  significantly  dependent  on  the  data  that  we  collect,  process,  and  share  in  discovering, 
developing, and commercializing drug products. These data are often considered personal data and are therefore regulated by data 
privacy laws in the United States and abroad. 

We have operations and conduct business in several countries outside the United States and plan to significantly expand the scope 
of these activities in those and/or additional countries, as discussed above under "Risks associated with our operations outside the 
United States could adversely affect our business." These activities subject us to additional data protection authority oversight and 
require us to comply with stringent local and regional data privacy laws, including the EU's General Data Protection Regulations 
("GDPR"). The GDPR has a wide range of compliance obligations, including increased consent and transparency requirements 
and data subject rights. Violations of the GDPR carry significant financial penalties for noncompliance (including possible fines 
of up to 4% of global annual turnover for the preceding financial year or €20 million (whichever is higher)). In addition to the 
GDPR,  certain  EU  Member  States  have  issued  or  will  be  issuing  their  own  implementation  legislation.  In  June  2021,  the  EC 
introduced  new  standard  contractual  clauses  required  to  be  incorporated  into  certain  new  and  existing  agreements  within 
prescribed  timeframes  in  order  to  continue  to  lawfully  transfer  personal  data  outside  the  EU.  Many  of  the  countries  that  have 
comprehensive data privacy laws have modeled their requirements after the GDPR. Compliance with these requirements has been 
and is expected to continue to be costly and time consuming.

We conduct clinical trials in many countries around the world, which have new or evolving data privacy laws that are often not 
interpreted  consistently  by  regulatory  authorities,  institutional  review  boards/ethics  committees,  or  clinical  trial  sites.  This 
complexity  has  resulted  in  increased  liability  in  the  management  of  clinical  trial  data,  as  well  as  additional  compliance, 
contractual, and due-diligence obligations that could lead to a delay in clinical trial site start-up. There also has been an increase 
of enforcement activities in various EU countries that require evidence of compliance with local data privacy requirements. While 
we continue to monitor these developments, there remains some uncertainty surrounding the legal and regulatory environment for 
these evolving privacy and data protection laws. Complying with varying jurisdictional requirements could increase the costs and 
complexity  of  compliance,  including  the  risk  of  substantial  financial  penalties  for  insufficient  notice  and  consent,  failure  to 
respond  to  data  subject  rights  requests,  lack  of  a  legal  basis  for  the  transfer  of  personal  information  out  of  the  EU  or  other 
countries  with  localization  laws  (i.e.,  laws  mandating  that  personal  data  collected  in  a  foreign  country  be  processed  and  stored 
within that country), or improper processing of personal data. Failure by our collaborators to comply with the strict rules on the 
transfer of personal data into the U.S. could result in the imposition of criminal and administrative sanctions on such collaborators 
or impact the flow of personal data, which could adversely affect our business. 

Most U.S. health care providers, including research institutions from which we or our collaborators obtain clinical trial data, are 
subject to privacy and security regulations promulgated under HIPAA. For example, as part of our human genetics initiative, our 
wholly-owned subsidiary, Regeneron Genetics Center LLC, has entered into collaborations with many research institutions, which 
are  subject  to  HIPAA.  Regeneron  is  not  a  covered  entity  or  business  associate  under  HIPAA  and  thus  is  not  subject  to  its 
requirements. However, we could be subject to criminal penalties if we, our affiliates, or our agents knowingly receive PHI in a 
manner that is not permitted under HIPAA. Consequently, depending on the facts and circumstances, we could face substantial 
criminal penalties if we knowingly receive PHI from a health care provider or research institution that has not satisfied HIPAA's 
requirements  for  its  disclosure.  There  are  instances  where  we  collect  and  maintain  personal  data,  which  may  include  health 
information  that  is  outside  the  scope  of  HIPAA  but  within  the  scope  of  state  health  privacy  laws  or  similar  state  level  privacy 
legislation. This information may be received throughout the clinical trial process, in the course of our research collaborations, 
directly  from  individuals  who  enroll  in  our  patient  assistance  programs,  and  from  our  own  employees  in  a  pandemic  response 
process (such as in connection with the COVID-19 pandemic).

Consumer  protection  laws  impact  the  manner  in  which  we  develop  and  maintain  processes  to  support  our  patient  assistance 
programs,  product  marketing  activities,  and  the  sharing  of  employee  and  clinical  data  for  internal  and  third-party  commercial 
activities.  Several  U.S.  states  have  proposed  and  passed  consumer  privacy  laws,  which  were  modeled  after  the  CCPA  and 
influenced  by  the  GDPR.  The  CCPA  is  a  consumer  protection  law  that  establishes  requirements  for  data  use  and  sharing 
transparency  and  provides  California  residents  with  personal  data  privacy  rights  regarding  the  use,  disclosure,  and  retention  of 
their  personal  data.  Amendments  to  the  CCPA  have,  among  other  things,  imposed  new  obligations  to  provide  notice  where 
personal data will be de-identified. Failure to comply with the CCPA may result in, among other things, significant civil penalties 
and  injunctive  relief,  or  statutory  or  actual  damages.  In  addition,  California  residents  have  the  right  to  bring  a  private  right  of 
action  in  connection  with  data  privacy  incidents  involving  certain  elements  of  personal  data.  These  claims  may  result  in 
significant liability and damages. These laws and regulations are constantly evolving and may impose limitations on our business 
activities.  Several  additional  state  consumer  privacy  laws  went  into  effect  in  2023  and  many  other  consumer  privacy  laws  are 

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expected to go into effect in the near future. Notably, these state laws provide more restrictions on the use of sensitive personal 
data,  including  health  information.  These  states  require  robust  consent  and  authorizations  prior  to  any  collection  or  use  of  this 
data, which may have a large impact on our ability to market to individuals in these jurisdictions based on their health conditions. 
At the federal level, Section 5 of the FTC Act is a consumer protection law that bars unfair and deceptive acts and practices and 
requires, among other things, companies to notify individuals that they will safeguard their personal data and that they will fulfil 
the  commitments  made  in  their  privacy  notices.  The  FTC  has  brought  legal  actions  against  organizations  that  have  violated 
consumers' privacy rights or have misled them by failing to maintain appropriate security. For example, in 2023 the FTC issued 
several enforcement actions related to privacy in the healthcare space, under both Section 5 of the FTC Act and the Health Breach 
Notification  Rule,  involving  companies  allegedly  using  consumer  health  data  for  marketing  purposes  in  violation  of  their  own 
policies and assurances.

Furthermore,  health  privacy  laws,  data  breach  notification  laws,  consumer  protection  laws,  data  localization  laws,  biometric 
privacy  laws,  and  genetic  privacy  laws  may  apply  directly  to  our  operations  and/or  those  of  our  collaborators  and  business 
partners  and  may  impose  restrictions  on  our  collection,  use,  and  dissemination  of  individuals'  health  and  other  personal  data. 
Individuals about whom we or our collaborators obtain health or other personal data, as well as the providers and third parties 
who share this data with us, may have statutory or contractual limits that impact our ability to further use and disclose the data. 
Many of these laws differ from each other in significant ways and have different effects. Many of the state laws enable a state 
attorney general to bring actions and provide private rights of action to consumers as enforcement mechanisms. Compliance with 
these laws requires a flexible privacy framework as they are constantly evolving. Federal regulators, state attorneys general, and 
plaintiffs' attorneys have been active in this space.

If  we  or  any  collaborators  fail  to  comply  with  applicable  federal,  state,  local,  or  foreign  regulatory  requirements,  we  could  be 
subject  to  a  range  of  regulatory  actions  that  could  affect  our  or  any  collaborators'  ability  to  commercialize  our  products.  Any 
threatened or actual government enforcement action could also generate adverse publicity and could result in additional regulatory 
oversight.

Increasing use of social media and artificial intelligence-based platforms could give rise to liability, breaches of data security 
and privacy laws, or reputational damage.

We and our employees are increasingly utilizing social media tools as a means of communication both internally and externally. 
Despite our efforts to monitor evolving social media communication guidelines and comply with applicable rules, there is a risk 
that the use of social media by us or our employees to communicate about our products or business may cause us to be found in 
violation  of  applicable  requirements.  In  addition,  our  employees  may  knowingly  or  inadvertently  make  use  of  social  media  in 
ways that may not comply with our social media policy or other legal or contractual requirements, which may give rise to liability, 
lead  to  the  loss  of  trade  secrets  or  other  intellectual  property,  or  result  in  public  exposure  of  personal  data  of  our  employees, 
clinical  trial  participants,  customers,  and  others.  Furthermore,  negative  posts  or  comments  about  us  or  our  products  in  social 
media  could  seriously  damage  our  reputation,  brand  image,  and  goodwill.  Additionally,  artificial  intelligence  ("AI")-based 
solutions, including generative AI, are increasingly being used in the biopharmaceutical industry (including by us). The use of AI 
solutions by our employees or third parties on which we rely may continue to increase and may lead to the public disclosure of 
confidential  information  (including  personal  data  and  proprietary  information)  in  contravention  of  our  internal  policies,  data 
protection laws, other applicable laws, or contractual requirements. The misuse of AI solutions may give rise to liability, lead to 
the loss of trade secrets or other intellectual property, result in reputational harm, or lead to outcomes with unintended biases or 
other  consequences.  The  misuse  of  AI  solutions  could  also  result  in  unauthorized  access  and  use  of  personal  data  of  our 
employees, clinical trial participants, collaborators, or other third parties. Any of these events could have a material adverse effect 
on our business, prospects, operating results, and financial condition and could adversely affect the price of our Common Stock.

Risks Related to Our Reliance on or Transactions with Third Parties

If  our  Antibody  Collaboration  with  Sanofi  is  terminated,  or  Sanofi  materially  breaches  its  obligations  thereunder,  our 
business,  prospects,  operating  results,  and  financial  condition,  and  our  ability  to  develop,  manufacture,  and  commercialize 
certain of our products and product candidates in the time expected, or at all, may be materially harmed.

We rely on support from Sanofi to develop, manufacture, and commercialize certain of our products and product candidates. With 
respect to the products and product candidates that we are co-developing with Sanofi under our Antibody Collaboration (currently 
consisting of Dupixent, Kevzara, and itepekimab), Sanofi initially funds a significant portion of development expenses incurred in 
connection with the development of these products and product candidates. In addition, we rely on Sanofi to lead much of the 
clinical  development  efforts,  assist  with  or  lead  efforts  to  obtain  and  maintain  regulatory  approvals,  and  lead  the 
commercialization efforts for these products and product candidates.

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If  Sanofi  terminates  the  Antibody  Collaboration  or  fails  to  comply  with  its  obligations  thereunder,  our  business,  prospects, 
operating results, and financial condition may be materially harmed. We would be required to either expend substantially more 
resources than we have anticipated to support our development efforts or cut back on such activities. If Sanofi does not perform 
its  obligations  with  respect  to  the  products  and  product  candidates  it  is  co-developing  and/or  co-commercializing  with  us,  our 
ability to develop, manufacture, and commercialize these products and product candidates may be adversely affected. While we 
have some commercial presence outside the United States, our commercial capabilities outside the United States are still limited 
and would need to be further developed or outsourced for products commercialized under our Antibody Collaboration (see also 
"Risks  Related  to  Commercialization  of  Our  Marketed  Products,  Product  Candidates,  and  New  Indications  for  Our  Marketed 
Products - If we are unable to establish commercial capabilities outside the United States for Libtayo, Dupixent, and any other 
products we intend to commercialize or co-commercialize outside the United States, our business, prospects, operating results, 
and financial condition may be adversely affected" above). Termination of the Antibody Collaboration may create substantial new 
and additional risks to the successful development and commercialization of the products and product candidates subject to such 
collaborations, particularly outside the United States.

If  our  collaboration  with  Bayer  for  EYLEA  HD  and  EYLEA  is  terminated,  or  Bayer  materially  breaches  its  obligations 
thereunder, our business, prospects, operating results, and financial condition, and our ability to continue to commercialize 
EYLEA HD and EYLEA outside the United States would be materially harmed.

We rely heavily on Bayer with respect to the commercialization of EYLEA HD and EYLEA outside the United States. Bayer is 
responsible for obtaining and maintaining regulatory approval outside the United States, as well as providing all sales, marketing, 
and commercial support for the product outside the United States. In particular, Bayer has responsibility for selling EYLEA HD 
and EYLEA outside the United States using its sales force and, in Japan, in cooperation with Santen pursuant to a Co-Promotion 
and Distribution Agreement with Bayer's Japanese affiliate. If Bayer and, in Japan, Santen do not perform their obligations in a 
timely  manner,  or  at  all,  our  ability  to  commercialize  EYLEA  HD  and  EYLEA  outside  the  United  States  will  be  significantly 
adversely affected. Bayer has the right to terminate its collaboration agreement with us at any time upon six or twelve months' 
advance notice, depending on the circumstances giving rise to termination. If Bayer were to terminate its collaboration agreement 
with  us,  we  may  not  have  the  resources  or  skills  to  replace  those  of  our  collaborator,  which  could  require  us  to  seek  another 
collaboration that might not be available on favorable terms or at all, and could cause significant issues for the commercialization 
of EYLEA HD and EYLEA outside the United States and result in substantial additional costs and/or lower revenues to us. We 
have limited commercial capabilities outside the United States and would have to develop or outsource these capabilities (see also 
"Risks  Related  to  Commercialization  of  Our  Marketed  Products,  Product  Candidates,  and  New  Indications  for  Our  Marketed 
Products - If we are unable to establish commercial capabilities outside the United States for Libtayo, Dupixent, and any other 
products we intend to commercialize or co-commercialize outside the United States, our business, prospects, operating results, 
and  financial  condition  may  be  adversely  affected"  above).  Termination  of  the  Bayer  collaboration  agreement  would  create 
substantial new and additional risks to the successful commercialization of EYLEA HD and EYLEA.

Our  collaborators  and  service  providers  may  fail  to  perform  adequately  in  their  efforts  to  support  the  development, 
manufacture, and commercialization of our drug candidates and current and future products.

We  depend  upon  third-party  collaborators,  including  Sanofi  and  Bayer,  and  service  providers  such  as  CROs,  outside  testing 
laboratories,  clinical  investigator  sites,  third-party  manufacturers,  fill/finish  providers,  and  product  packagers  and  labelers,  to 
assist us in the manufacture and preclinical and clinical development of our product candidates. We also depend, or will depend, 
on  some  of  these  or  other  third  parties  in  connection  with  the  commercialization  of  our  marketed  products  and  our  product 
candidates and new indications for our marketed products if they are approved for marketing. If any of our existing collaborators 
or service providers breaches or terminates its agreement with us or does not perform its development or manufacturing services 
under  an  agreement  in  a  timely  manner  (including  as  a  result  of  its  inability  to  perform  due  to  financial  or  other  relevant 
constraints,  such  as  due  to  the  armed  conflict  between  Russia  and  Ukraine)  or  in  compliance  with  applicable  GMPs,  GLPs,  or 
GCP  standards,  we  could  experience  additional  costs,  delays,  and  difficulties  in  the  manufacture  or  development  of,  or  in 
obtaining approval by regulatory authorities for, or successfully commercializing our product candidates. See also "Risks Related 
to Manufacturing and Supply - Our or our collaborators' failure to meet the stringent requirements of governmental regulation in 
the  manufacture  of  drug  products  or  product  candidates  could  result  in  incurring  substantial  remedial  costs,  delays  in  the 
development  or  approval  of  our  product  candidates  or  new  indications  for  our  marketed  products  and/or  in  their  commercial 
launch if regulatory approval is obtained, and a reduction in sales."

We and our collaborators rely on third-party service providers to support the distribution of our marketed products and for many 
other  related  activities  in  connection  with  the  commercialization  of  these  marketed  products.  Despite  our  or  our  collaborators' 
arrangements with them, these third parties may not perform adequately. If these service providers do not perform their services 
adequately, sales of our marketed products will suffer.

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We  have  undertaken  and  may  in  the  future  undertake  strategic  acquisitions,  and  any  difficulties  from  integrating  such 
acquisitions could adversely affect our business, operating results, and financial condition.

We may acquire companies, businesses, products, or product candidates that complement or augment our existing business. For 
example,  in  May  2022  and  September  2023,  we  completed  our  acquisition  of  Checkmate  Pharmaceuticals,  Inc.  and  Decibel 
Therapeutics,  Inc.,  respectively.  The  process  of  proposing,  negotiating,  completing,  and  integrating  any  such  acquisition  is 
lengthy and complex. Other companies may compete with us for such acquisitions. In addition, we may not be able to integrate 
any acquired business successfully or operate any acquired business profitably. Integrating any newly acquired business could be 
expensive  and  time  consuming.  Integration  efforts  often  take  a  significant  amount  of  time,  place  a  significant  strain  on 
managerial, operational, and financial resources, result in a loss of key personnel of the acquired business, and could prove to be 
more  difficult  or  expensive  than  we  predict.  The  diversion  of  our  management’s  attention  and  any  delay  or  difficulties 
encountered in connection with any acquisitions we may consummate could result in the disruption of our ongoing business or 
inconsistencies in standards and controls that could negatively affect our ability to maintain third-party relationships. Moreover, 
we may need to raise additional funds through public or private debt or equity financing to acquire any businesses, products, or 
product candidates, which may result in dilution for shareholders or the incurrence of indebtedness.

As  part  of  our  efforts  to  acquire  companies,  businesses,  products,  or  product  candidates  or  to  enter  into  other  significant 
transactions, we will conduct business, legal, and financial due diligence with the goal of identifying and evaluating material risks 
involved in the transaction. Despite our efforts, we ultimately may be unsuccessful in ascertaining or evaluating all such risks and, 
as  a  result,  might  not  realize  the  intended  advantages  of  the  transaction.  If  we  fail  to  realize  the  expected  benefits  from 
acquisitions  we  have  consummated  or  may  consummate  in  the  future,  whether  as  a  result  of  unidentified  risks  or  liabilities, 
integration difficulties, regulatory setbacks, litigation with current or former employees and other events, our business, operating 
results,  and  financial  condition  could  be  adversely  affected.  For  any  acquired  product  candidates,  we  will  also  need  to  make 
certain assumptions about, among other things, development costs, the likelihood of receiving regulatory approval, and the market 
for any such product candidates. Our assumptions may prove to be incorrect, which could cause us to fail to realize the anticipated 
benefits of these transactions.

In addition, we may experience significant charges to earnings in connection with our efforts, if any, to consummate acquisitions. 
For  transactions  that  are  ultimately  not  consummated,  these  charges  may  include  fees  and  expenses  for  investment  bankers, 
attorneys,  accountants,  and  other  advisors  in  connection  with  our  efforts.  Even  if  our  efforts  to  consummate  a  particular 
transaction are successful, we may incur substantial charges for closure costs associated with elimination of duplicate operations 
and facilities, acquired in-process research and development charges, or intangible asset impairment charges. In either case, the 
incurrence of these charges could adversely affect our operating results for particular periods.

Other Risks Related to Our Business

We  are  dependent  on  our  key  personnel  and  if  we  cannot  recruit  and  retain  leaders  in  our  research,  development, 
manufacturing, and commercial organizations, our business will be harmed.

We are highly dependent on certain of our executive officers and other key members of our senior management team. If we are 
not able to retain (or for any other reason lose the services of) any of these persons, our business may suffer. In particular, we 
depend  on  the  services  of  Leonard  S.  Schleifer,  M.D.,  Ph.D.,  our  President  and  Chief  Executive  Officer,  and  George  D. 
Yancopoulos, M.D., Ph.D., our President and Chief Scientific Officer. We are also highly dependent on the expertise and services 
of other senior management members leading our research, development, manufacturing, and commercialization efforts. There is 
intense competition in the biotechnology industry for qualified scientists and managerial personnel in the research, development, 
manufacture,  and  commercialization  of  drugs.  We  may  not  be  able  to  continue  to  attract  and  retain  the  qualified  personnel 
necessary to continue to advance our business and achieve our strategic objectives.

Significant disruptions of information technology systems or breaches of data security could adversely affect our business.

Our  business  is  increasingly  dependent  on  critical,  complex,  and  interdependent  information  technology  systems,  including 
Internet-based  systems,  to  support  business  processes  as  well  as  internal  and  external  communications.  These  systems  are  also 
critical  to  enable  remote  working  arrangements,  which  have  been  growing  in  importance.  The  size  and  complexity  of  our 
computer  systems  make  us  potentially  vulnerable  to  IT  system  breakdowns,  internal  and  external  malicious  intrusion,  and 
computer viruses and ransomware, which may impact product production and key business processes. We also have outsourced 
significant elements of our information technology infrastructure and operations to third parties, which may allow them to access 
our  confidential  information  and  may  also  make  our  systems  vulnerable  to  service  interruptions  or  to  security  breaches  from 
inadvertent or intentional actions by such third parties or others.

In addition, our systems are potentially vulnerable to data security breaches - whether by employees or others - which may expose 
sensitive data to unauthorized persons. Data security breaches could lead to the loss of trade secrets or other intellectual property, 

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result  in  demands  for  ransom  or  other  forms  of  blackmail,  or  lead  to  the  public  exposure  of  personal  information  (including 
sensitive personal information) of our employees, clinical trial patients, customers, and others. Such attacks are of ever-increasing 
levels of sophistication and are made by groups and individuals with a wide range of motives (including industrial espionage or 
extortion) and expertise, including by organized criminal groups, "hacktivists," nation states, and others. As a company with an 
increasingly global presence, our systems are subject to frequent attacks. There is the potential that our systems may be directly or 
indirectly  affected  as  nation-states  conduct  global  cyberwarfare,  including  in  connection  with  the  current  Russia-Ukraine  or 
Hamas-Israel armed conflict.

Due to the nature of some of these attacks, there is a risk that an attack may remain undetected for a period of time. While we 
continue  to  make  investments  to  improve  the  protection  of  data  and  information  technology,  and  to  oversee  and  monitor  the 
security  measures  of  our  suppliers  and/or  service  providers,  there  can  be  no  assurance  that  our  efforts  will  prevent  service 
interruptions or security breaches. In addition, we depend in part on third-party security measures over which we do not have full 
control to protect against data security breaches.

If we or our suppliers and/or service providers fail to maintain or protect our information technology systems and data security 
effectively and in compliance with U.S. and foreign laws, or fail to anticipate, plan for, or manage significant disruptions to these 
systems, we or our suppliers and/or service providers could have difficulty preventing, detecting, or controlling such disruptions 
or  security  breaches,  which  could  result  in  legal  proceedings,  liability  under  U.S.  and  foreign  laws  that  protect  the  privacy  of 
personal  information,  disruptions  to  our  operations,  government  investigations,  breach  of  contract  claims,  and  damage  to  our 
reputation (in each case in the U.S. or globally), which could have a material adverse effect on our business, prospects, operating 
results, and financial condition.

Public health outbreaks, epidemics, or pandemics (such as the COVID-19 pandemic) have adversely affected and may in the 
future adversely affect our business.

The COVID-19 pandemic previously adversely affected, and the COVID-19 pandemic or other actual or threatened public health 
outbreaks, epidemics, or pandemics may in the future adversely affect, among other things, the economic and financial markets 
and  labor  resources  of  the  countries  in  which  we  operate;  our  manufacturing  and  supply  chain  operations,  research  and 
development efforts, commercial operations and sales force, administrative personnel, third-party service providers, and business 
partners and customers; and the demand for our marketed products.

Such  disruptions  in  our  operations  could  materially  adversely  impact  our  business,  prospects,  operating  results,  and  financial 
condition.  To  the  extent  a  public  health  outbreak,  epidemic,  or  pandemic  adversely  affects  our  business,  prospects,  operating 
results, or financial condition, it may also have the effect of heightening many of the other risks described in this "Risk Factors" 
section.

Our indebtedness could adversely impact our business.

We have certain indebtedness and contingent liabilities, including milestone and royalty payment obligations. As of December 31, 
2023, we had an aggregate of $2.703 billion of outstanding indebtedness under our senior unsecured notes and the lease financing 
facility. We may also incur additional debt in the future. Any such indebtedness could:

•
•

•

limit our ability to access capital markets and incur additional debt in the future;
require us to dedicate a substantial portion of our cash flow from operations to payments on our indebtedness, thereby 
reducing  the  availability  of  our  cash  flow  for  other  purposes,  including  business  development  efforts,  research  and 
development, and mergers and acquisitions; and
limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate, thereby 
placing us at a competitive disadvantage compared to competitors that have less debt.

Changes in foreign currency exchange rates could have a material adverse effect on our operating results.

Our revenue from outside the United States will increase as our products, whether marketed or otherwise commercialized by us or 
our collaborators, gain marketing approval in such jurisdictions. Our primary foreign currency exposure relates to movements in 
the Japanese yen, euro, British pound sterling, Canadian dollar, Chinese yuan, and Australian dollar. If the U.S. dollar weakens 
against a specific foreign currency, our revenues will increase, having a positive impact on net income, but our overall expenses 
will  increase,  having  a  negative  impact.  Conversely,  if  the  U.S.  dollar  strengthens  against  a  specific  foreign  currency,  our 
revenues will decrease, having a negative impact on net income, but our overall expenses will decrease, having a positive impact. 
Therefore,  significant  changes  in  foreign  exchange  rates  can  impact  our  operating  results  and  the  financial  condition  of  our 
Company.  For  example,  as  previously  reported,  the  amount  of  our  share  of  profits  we  earned  in  connection  with 
commercialization  of  antibodies  outside  the  United  States  was  adversely  impacted  in  2022  by  the  U.S.  dollar  strengthening 
against foreign currencies, including the Japanese yen and the euro.

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Our  investments  are  subject  to  risks  and  other  external  factors  that  may  result  in  losses  or  affect  the  liquidity  of  these 
investments.

As  of  December  31,  2023,  we  had  $2.730  billion  in  cash  and  cash  equivalents  and  $13.511  billion  in  marketable  securities 
(including $977.4 million in equity securities). Our investments consist primarily of debt securities, including investment-grade 
corporate bonds. These fixed-income investments are subject to external factors that may adversely affect their market value or 
liquidity, such as interest rate, liquidity, market, and issuer credit risks, including actual or anticipated changes in credit ratings. 
The equity securities we hold may experience significant volatility and may decline in value or become worthless if the issuer 
experiences an adverse development. Furthermore, our equity investments could be subject to dilution (and decline in value) as a 
result of the issuance of additional equity interests by the applicable issuer. If any of our investments suffer market price declines, 
such declines may have an adverse effect on our financial condition and operating results.

Risks Related to Our Common Stock

Our stock price is extremely volatile.

There has been significant volatility in our stock price and generally in the market prices of biotechnology companies' securities. 
Various factors and events may have a significant impact on the market price of our Common Stock. These factors include, by 
way of example:

•

•

net product sales of our marketed products (as recorded by us or our collaborators), in particular EYLEA HD, EYLEA, 
Dupixent, and Libtayo, as well as our overall operating results;
if  any  of  our  product  candidates  or  our  new  indications  for  our  marketed  products  receive  regulatory  approval,  net 
product sales of, and profits from, these product candidates and new indications;

• market acceptance of, and the market share for, our marketed products, especially EYLEA HD, EYLEA, Dupixent, and 

Libtayo;
whether our net product sales and net profits underperform, meet, or exceed the expectations of investors or analysts;
announcement of actions by the FDA or foreign regulatory authorities or their respective advisory committees regarding 
our,  or  our  collaborators',  or  our  competitors',  currently  pending  or  future  application(s)  for  regulatory  approval  of 
product candidate(s) or new indications for marketed products;
announcement of submission of an application for regulatory approval of one or more of our, or our competitors', product 
candidates or new indications for marketed products;
progress, delays, or results in clinical trials of our or our competitors' product candidates or new indications for marketed 
products;
announcement of technological innovations or product candidates by us or competitors;
claims by others that our products or technologies infringe their patents;
challenges by others to our patents in the EPO and in the USPTO;
public concern as to the safety or effectiveness of any of our marketed products or product candidates or new indications 
for our marketed products;
pricing  or  reimbursement  actions,  decisions,  or  recommendations  by  government  authorities,  insurers,  or  other 
organizations (such as health maintenance organizations and PBMs) affecting the coverage, reimbursement, or use of any 
of our marketed products or competitors' products;
our ability to raise additional capital as needed on favorable terms;
developments in our relationships with collaborators or key customers;
developments  in  the  biotechnology  industry  or  in  government  regulation  of  healthcare,  including  those  relating  to 
compounding (i.e., a practice in which a pharmacist, a physician, or, in the case of an outsourcing facility, a person under 
the supervision of a pharmacist, combines, mixes, or alters ingredients of a drug to create a medication tailored to the 
needs of an individual patient);
large sales of our Common Stock by our executive officers or other employees, directors, or significant shareholders (or 
the expectation of any such sales);
changes in tax rates, laws, or interpretation of tax laws;
arrivals and departures of key personnel; 
general market conditions;
impact of public health outbreaks, epidemics, or pandemics (such as the COVID-19 pandemic) on our business;
our ability to repurchase our Common Stock under any share repurchase program on favorable terms or at all;
trading  activity  that  results  from  the  rebalancing  of  stock  indices  in  which  our  Common  Stock  is  included,  or  the 
inclusion or exclusion of our Common Stock from such indices; 
other factors identified in these "Risk Factors"; and 
the perception by the investment community or our shareholders of any of the foregoing factors.

•
•

•

•

•
•
•
•

•

•
•
•

•

•
•
•
•
•
•

•
•

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The trading price of our Common Stock has been, and could continue to be, subject to wide fluctuations in response to these and 
other factors, including the sale or attempted sale of a large amount of our Common Stock in the market. As discussed in greater 
detail under "Future sales of our Common Stock by our significant shareholders or us may depress our stock price and impair our 
ability to raise funds in new share offerings" below, a large percentage of our Common Stock is owned by a small number of our 
principal shareholders. As a result, the public float of our Common Stock (i.e., the portion of our Common Stock held by public 
investors,  as  opposed  to  the  Common  Stock  held  by  our  directors,  officers,  and  principal  shareholders)  may  be  lower  than  the 
public float of other large public companies with broader public ownership. Therefore, the trading price of our Common Stock 
may fluctuate significantly more than the stock market as a whole. These factors may exacerbate the volatility in the trading price 
of our Common Stock and may negatively impact your ability to liquidate your investment in Regeneron at the time you wish at a 
price you consider satisfactory. Broad market fluctuations may also adversely affect the market price of our Common Stock. In 
the past, securities class action litigation has often been initiated against companies following periods of volatility in their stock 
price. This type of litigation could result in substantial costs and divert our management's attention and resources, and could also 
require  us  to  make  substantial  payments  to  satisfy  judgments  or  to  settle  litigation,  which  may  harm  our  business,  prospects, 
operating results, and financial condition.

Future sales of our Common Stock by our significant shareholders or us may depress our stock price and impair our ability to 
raise funds in new share offerings.

A small number of our shareholders beneficially own a substantial amount of our Common Stock. As of December 31, 2023, our 
five  largest  shareholders  plus  Dr.  Schleifer,  our  Chief  Executive  Officer,  beneficially  owned  approximately  39.3%  of  our 
outstanding shares of Common Stock, assuming, in the case of our Chief Executive Officer, the conversion of his Class A Stock 
into Common Stock and the exercise of all options held by him which are exercisable within 60 days of December 31, 2023. If 
our significant shareholders or we sell substantial amounts of our Common Stock in the public market, or there is a perception 
that  such  sales  may  occur,  the  market  price  of  our  Common  Stock  could  fall.  Sales  of  Common  Stock  by  our  significant 
shareholders also might make it more difficult for us to raise funds by selling equity or equity-related securities in the future at a 
time and price that we deem appropriate.

There  can  be  no  assurance  that  we  will  repurchase  shares  of  our  Common  Stock  or  that  we  will  repurchase  shares  at 
favorable prices.

In January 2023, our board of directors authorized a share repurchase program to repurchase up to $3.0 billion of our Common 
Stock  (of  which  $1.531  billion  remained  available  as  of  December  31,  2023).  There  can  be  no  assurance  of  any  future  share 
repurchases or share repurchase program authorizations. Any share repurchases will depend upon, among other factors, our cash 
balances  and  potential  future  capital  requirements,  our  results  of  operations  and  financial  condition,  the  price  of  our  Common 
Stock on the NASDAQ Global Select Market, and other factors that we may deem relevant. We can provide no assurance that we 
will repurchase shares of our Common Stock at favorable prices, if at all.

Our existing shareholders may be able to exert substantial influence over matters requiring shareholder approval and over our 
management.

Holders of Class A Stock, who are generally the shareholders who purchased their stock from us before our initial public offering, 
are entitled to ten votes per share, while holders of Common Stock are entitled to one vote per share. As of December 31, 2023, 
holders  of  Class  A  Stock  held  14.5%  of  the  combined  voting  power  of  all  shares  of  Common  Stock  and  Class  A  Stock  then 
outstanding. These shareholders, if acting together, would be in a position to substantially influence the election of our directors 
and the vote on certain corporate transactions that require majority or supermajority approval of the combined classes, including 
mergers and other business combinations. This may result in our taking corporate actions that other shareholders may not consider 
to be in their best interest and may affect the price of our Common Stock. As of December 31, 2023:

•

•

our  current  executive  officers  and  directors  beneficially  owned  6.1%  of  our  outstanding  shares  of  Common  Stock, 
assuming  conversion  of  their  Class  A  Stock  into  Common  Stock  and  the  exercise  of  all  options  held  by  such  persons 
which  are  exercisable  within  60  days  of  December  31,  2023,  and  17.7%  of  the  combined  voting  power  of  our 
outstanding  shares  of  Common  Stock  and  Class  A  Stock,  assuming  the  exercise  of  all  options  held  by  such  persons 
which are exercisable within 60 days of December 31, 2023; and
our five largest shareholders plus Dr. Schleifer, our Chief Executive Officer, beneficially owned approximately 39.3% of 
our outstanding shares of Common Stock, assuming, in the case of our Chief Executive Officer, the conversion of his 
Class  A  Stock  into  Common  Stock  and  the  exercise  of  all  options  held  by  him  which  are  exercisable  within  60  days 
December 31, 2023. In addition, these five shareholders plus our Chief Executive Officer held approximately 46.5% of 
the combined voting power of our outstanding shares of Common Stock and Class A Stock, assuming the exercise of all 
options held by our Chief Executive Officer which are exercisable within 60 days of December 31, 2023.

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The  anti-takeover  effects  of  provisions  of  our  charter,  by-laws,  and  of  New  York  corporate  law,  as  well  as  the  contractual 
provisions in our investor and collaboration agreements and certain provisions of our compensation plans and agreements, 
could deter, delay, or prevent an acquisition or other "change of control" of us and could adversely affect the price of our 
Common Stock.

Our certificate of incorporation, our by-laws, and the New York Business Corporation Law contain various provisions that could 
have the effect of delaying or preventing a change in control of our Company or our management that shareholders may consider 
favorable or beneficial. Some of these provisions could discourage proxy contests and make it more difficult for shareholders to 
elect directors and take other corporate actions. These provisions could also limit the price that investors might be willing to pay 
in the future for shares of our Common Stock. These provisions include:

•

•

•

•

•

•

authorization to issue "blank check" preferred stock, which is preferred stock that can be created and issued by the board 
of directors without prior shareholder approval, with rights senior to those of our Common Stock and Class A Stock;
a staggered board of directors, so that it would take three successive annual shareholder meetings to replace all of our 
directors;
a  requirement  that  removal  of  directors  may  only  be  effected  for  cause  and  only  upon  the  affirmative  vote  of  at  least 
eighty percent (80%) of the outstanding shares entitled to vote for directors, as well as a requirement that any vacancy on 
the board of directors may be filled only by the remaining directors;
a provision whereby any action required or permitted to be taken at any meeting of shareholders may be taken without a 
meeting, only if, prior to such action, all of our shareholders consent, the effect of which is to require that shareholder 
action may only be taken at a duly convened meeting;
a  requirement  that  any  shareholder  seeking  to  bring  business  before  an  annual  meeting  of  shareholders  must  provide 
timely notice of this intention in writing and meet various other requirements; and
under  the  New  York  Business  Corporation  Law,  in  addition  to  certain  restrictions  which  may  apply  to  "business 
combinations"  involving  our  Company  and  an  "interested  shareholder,"  a  plan  of  merger  or  consolidation  of  our 
Company  must  be  approved  by  two-thirds  of  the  votes  of  all  outstanding  shares  entitled  to  vote  thereon.  See  the  risk 
factor  above  captioned  "Our  existing  shareholders  may  be  able  to  exert  substantial  influence  over  matters  requiring 
shareholder approval and over our management."

Further,  certain  of  our  current  or  former  collaborators  are  currently  bound  by  "standstill"  provisions  under  their  respective 
agreements  with  us.  These  include  the  January  2014  amended  and  restated  investor  agreement  between  us  and  Sanofi,  as 
amended, which contractually prohibits Sanofi from seeking to directly or indirectly exert control of our Company or acquiring 
more than 30% of our Class A Stock and Common Stock, taken together. 

In  addition,  our  Change  in  Control  Severance  Plan  and  the  employment  agreement  with  our  Chief  Executive  Officer,  each  as 
amended  and  restated,  provide  for  severance  benefits  in  the  event  of  termination  as  a  result  of  a  change  in  control  of  our 
Company. Also, equity awards issued under our long-term incentive plans may become fully vested in connection with a "change 
in control" of our Company, as defined in the plans. These contractual provisions may also have the effect of deterring, delaying, 
or preventing an acquisition or other change in control.

Item 1B. Unresolved Staff Comments

None.

Item 1C. Cybersecurity

Risk Management and Strategy

We regularly assess risks from cybersecurity threats; monitor our information systems for potential vulnerabilities; and test those 
systems pursuant to our cybersecurity policies, processes, and practices, which are integrated into our overall risk management 
program. To protect our information systems from cybersecurity threats, we use various security tools that are designed to help 
identify, escalate, investigate, resolve, and recover from security incidents in a timely manner. Our Technology Risk Management 
Committee,  which  is  comprised  of  representatives  from  our  business  operations  and  support  functions  (e.g.,  legal,  finance, 
internal  audit,  commercial,  privacy),  assesses  risks  based  on  probability  and  potential  impact  to  key  business  systems  and 
processes.  Risks  that  are  considered  high  are  incorporated  into  our  overall  risk  management  program.  A  mitigation  plan  is 
developed for each identified high risk, with progress reported to the Technology Risk Management Committee and tracked as 
part of our overall risk management program overseen by the Audit Committee of our board of directors.

We collaborate with third parties to assess the effectiveness of our cybersecurity prevention and response systems and processes. 
These  include  cybersecurity  assessors,  consultants,  and  other  external  cybersecurity  experts  to  assist  in  the  identification, 
verification, and validation of cybersecurity risks, as well as to support associated mitigation plans when necessary. We have also 

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developed a third-party cybersecurity risk management process to conduct due diligence on external entities, including those that 
perform cybersecurity services.

Cybersecurity  threats,  including  those  resulting  from  any  previous  cybersecurity  incidents,  have  not  materially  affected  our 
Company,  including  our  business  strategy,  results  of  operations,  or  financial  condition.  We  do  not  believe  that  cybersecurity 
threats resulting from any previous cybersecurity incidents of which we are aware are reasonably likely to materially affect our 
Company.  Refer  to  the  risk  factor  captioned  "Significant  disruptions  of  information  technology  systems  or  breaches  of  data 
security could adversely affect our business" in Part I, Item 1A. "Risk Factors" for additional description of cybersecurity risks 
and potential related impacts on our Company.

Governance

Our board of directors oversees our risk management process, including as it pertains to cybersecurity risks, directly and through 
its committees. The Audit Committee of the board oversees our risk management program, which focuses on the most significant 
risks we face in the short-, intermediate-, and long-term timeframe. Audit Committee meetings include discussions of specific risk 
areas  throughout  the  year,  including,  among  others,  those  relating  to  cybersecurity  threats,  and  reports  from  the  Chief  Audit 
Executive  on  our  enterprise  risk  profile  on  an  annual  basis.  The  Audit  Committee  reviews  our  cybersecurity  risk  profile  with 
management on a periodic basis using key performance and/or risk indicators. These key performance indicators are metrics and 
measurements  designed  to  assess  the  effectiveness  of  our  cybersecurity  program  in  the  prevention,  detection,  mitigation,  and 
remediation of cybersecurity incidents.

We take a risk-based approach to cybersecurity and have implemented cybersecurity policies throughout our operations that are 
designed  to  address  cybersecurity  threats  and  incidents.  The  Company's  Chief  Information  Security  Officer  ("CISO"),  in 
coordination  with  the  Chief  Information  Officer  and  the  Technology  Risk  Management  Committee,  is  responsible  for  the 
establishment and maintenance of our cybersecurity program, as well as the assessment and management of cybersecurity risks. 
The current CISO has over 35 years of experience in information security and possesses the requisite education, skills, experience, 
and  industry  certifications  expected  of  an  individual  assigned  to  these  duties.  The  CISO  provides  periodic  updates  on  our 
cybersecurity  risk  profile  to  management's  Technology  Risk  Management  Committee,  the  Audit  Committee  of  our  board  of 
directors, and the Audit Committee chair.

Item 2. Properties

We  conduct  our  research,  development,  manufacturing,  and  administrative  activities  at  our  owned  and  leased  facilities.  A 
summary of our significant owned and leased properties is provided below. 

Tarrytown, New York

At our Tarrytown, New York location, we lease approximately 1,467,000 square feet of laboratory and office space. Refer to Part 
II,  Item  7.  "Management's  Discussion  and  Analysis  of  Financial  Condition  and  Results  of  Operations  -  Liquidity  and  Capital 
Resources - Tarrytown, New York Leases" for further details. We also own an approximate 100-acre parcel of land adjacent to our 
Tarrytown, New York location, which we are in the process of developing, primarily in connection with expanding our research 
and support facilities to accommodate our growth.

Rensselaer, New York

We own facilities in Rensselaer, New York totaling approximately 1,260,000 square feet of manufacturing, research, office, and 
warehouse space. In addition, we have constructed an approximately 341,000 square foot fill/finish facility in Rensselaer, New 
York that is undergoing process validation as required by regulatory authorities.

Limerick, Ireland

We own a facility in Limerick, Ireland totaling approximately 555,000 square feet of manufacturing, warehouse, laboratory, and 
office space. 

Item 3. Legal Proceedings

The  information  called  for  by  this  item  is  incorporated  herein  by  reference  to  the  information  set  forth  in  Note  16  to  our 
Consolidated Financial Statements included in this report.

Item 4. Mine Safety Disclosures

Not applicable.

71

PART II

Item 5. Market for Registrant's Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Market for Registrant's Common Equity

Our Common Stock, par value $.001 per share, is quoted on The NASDAQ Global Select Market under the symbol "REGN." Our 
Class A Stock, par value $.001 per share, is not publicly quoted or traded.

As of January 25, 2024, there were 153 shareholders of record of our Common Stock and 14 shareholders of record of our Class 
A Stock.  

We have never paid cash dividends on our Common Stock or Class A Stock and do not currently have plans to do so.

 STOCK PERFORMANCE GRAPH

Set  forth  below  is  a  line  graph  comparing  the  cumulative  total  shareholder  return  on  Regeneron's  Common  Stock  with  the 
cumulative total return of (i) the NASDAQ US Benchmark Pharmaceuticals Total Return Index ("NQ US Pharma TR Index"), 
and (ii) Standard & Poor's 500 Stock Index ("S&P 500") for the period from December 31, 2018 through December 31, 2023. The 
comparison assumes that $100 was invested on December 31, 2018 in our Common Stock and in both of the foregoing indices. 
All values assume reinvestment of the pre-tax value of dividends paid by companies included in these indices. The historical stock 
price  performance  of  our  Common  Stock  shown  in  the  graph  below  is  not  necessarily  indicative  of  future  stock  price 
performance. 

Regeneron
S&P 500
NQ US Pharma TR Index

12/31/2018 12/31/2019 12/31/2020 12/31/2021 12/31/2022 12/31/2023
235.15 
$ 
190.27 
$ 
182.08 
$ 

100.00  $ 
100.00  $ 
100.00  $ 

193.17  $ 
153.16  $ 
175.29  $ 

169.08  $ 
190.13  $ 
157.42  $ 

129.35  $ 
149.83  $ 
126.56  $ 

100.53  $ 
128.88  $ 
114.51  $ 

This  performance  graph  shall  not  be  deemed  "filed"  for  purposes  of  Section  18  of  the  Securities  Exchange  Act  of  1934,  as 
amended,  or  incorporated  by  reference  into  any  filing  of  ours  under  the  Securities  Act  of  1933,  as  amended,  or  the  Securities 
Exchange Act, except as shall be expressly set forth by specific reference to such filing.

72

RegeneronS&P 500NQ US Pharma TR Index12/31/201812/31/201912/31/202012/31/202112/31/202212/31/2023$0.00$50.00$100.00$150.00$200.00$250.00Issuer Purchases of Equity Securities

The  table  below  reflects  shares  of  Common  Stock  we  repurchased  under  our  share  repurchase  programs,  as  well  as  Common 
Stock withheld by us for employees to satisfy their tax withholding obligations arising upon the vesting of restricted stock granted 
under  one  of  our  long-term  incentive  plans,  during  the  three  months  ended  December  31,  2023.  Refer  to  Part  II,  Item  7. 
"Management's Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources" for 
further details of our share repurchase programs.

Total Number of 
Shares Purchased

Average Price 
Paid per Share

Total Number of 
Shares Purchased 
as Part of Publicly 
Announced 
Programs

Approximate Dollar 
Value of Shares that 
May Yet Be
 Purchased Under the 
Programs
(In millions)

272,952 

558,642 
831,594  (a)

$ 

$ 

802.55 

849.22 

269,976 

93,108 
363,084  (a)

$ 

$ 

1,609.1 

1,530.6 

Period

11/1/2023–11/30/2023

12/1/2023–12/31/2023

Total

(a) The difference between the total number of shares purchased and the total number of shares purchased as part of publicly announced 
programs relates to Common Stock withheld by us for employees to satisfy their tax withholding obligations arising upon the vesting of 
restricted stock granted under one of our long-term incentive plans.

Item 6. [Reserved]

Item 7. Management's Discussion and Analysis of Financial Condition and Results and Results of Operations

The  following  discussion  should  be  read  in  conjunction  with  the  consolidated  financial  statements  and  related  notes  included 
elsewhere in this report. Refer to Part II, Item 7 in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022 
(filed with the SEC on February 6, 2023) for additional discussion of our financial condition and results of operations for the 
year  ended  December  31,  2021,  as  well  as  our  financial  condition  and  results  of  operations  for  the  year  ended  December  31, 
2022 compared to the year ended December 31, 2021.

Overview

Regeneron  Pharmaceuticals,  Inc.  is  a  fully  integrated  biotechnology  company  that  invents,  develops,  manufactures,  and 
commercializes  medicines  for  people  with  serious  diseases.  Our  research  and  development  efforts  have  led  to  eleven  FDA-
approved  products  that  have  received  marketing  approval  and  approximately  35  product  candidates  in  clinical  development, 
almost all of which were homegrown in our laboratories.

Our ability to generate profits and to generate positive cash flow from operations over the next several years depends significantly 
on  the  continued  success  in  commercializing  EYLEA  and  Dupixent,  as  well  as  whether  we  are  successful  in  commercializing 
EYLEA HD. We expect to continue to incur substantial expenses related to our research and development activities, a portion of 
which  we  expect  to  be  reimbursed  by  our  collaborators.  In  addition,  our  research  and  development  activities  and  related  costs 
which  are  not  reimbursed  are  expected  to  expand  and  require  additional  resources.  We  also  expect  to  incur  substantial  costs 
related to the commercialization of our marketed products. Our financial results may fluctuate from quarter to quarter and will 
depend on, among other factors, the net sales of our products; the scope and progress of our research and development efforts; the 
timing  of  certain  expenses;  the  continuation  of  our  collaborations,  in  particular  with  Sanofi  and  Bayer,  including  our  share  of 
collaboration profits from sales of commercialized products and the amount of reimbursement of our research and development 
expenses that we receive from collaborators; and the amount of income tax expense we incur, which is partly dependent on the 
profits or losses we earn in each of the countries in which we operate. We cannot predict whether or when new products or new 
indications for marketed products will receive regulatory approval or, if any such approval is received, whether we will be able to 
successfully commercialize such product(s) and whether or when they may become profitable.

73

 
 
 
 
 
 
Critical Accounting Estimates

The  preparation  of  financial  statements  in  accordance  with  accounting  principles  generally  accepted  in  the  United  States  of 
America ("GAAP") requires management to make estimates and assumptions that affect reported amounts and related disclosures 
in  the  financial  statements.  Critical  accounting  estimates  are  those  estimates  made  in  accordance  with  GAAP  that  involve  a 
significant  level  of  estimation  uncertainty  and  have  had  or  are  reasonably  likely  to  have  a  material  impact  on  our  results  of 
operations or financial condition.

Management believes the current assumptions used to estimate amounts reflected in our Consolidated Financial Statements are 
appropriate. However, if actual experience differs from the assumptions used in estimating amounts reflected in our Consolidated 
Financial  Statements,  the  resulting  changes  could  have  a  material  adverse  effect  on  our  results  of  operations,  and,  in  certain 
situations,  could  have  a  material  adverse  effect  on  our  liquidity  and  financial  condition.  The  critical  accounting  estimates  that 
impact our Consolidated Financial Statements are described below.  

Product Revenue

We recognize revenue from product sales at a point in time when our customer is deemed to have obtained control of the product, 
which generally occurs upon receipt or acceptance by our customer. The amount of revenue we recognize from product sales may 
vary due to rebates, chargebacks, and discounts provided under governmental and other programs, distribution-related fees, and 
other sales-related deductions. In order to determine the transaction price, we estimate, utilizing the expected value method, the 
amount of variable consideration to which we will be entitled. This estimate is based upon contracts with customers, healthcare 
providers,  payors  and  government  agencies,  statutorily-defined  discounts  applicable  to  government-funded  programs,  historical 
experience, estimated payor mix, and other relevant factors. Calculating these provisions involves estimates and judgments. We 
review our estimates of rebates, chargebacks, and other applicable provisions each period and record any necessary adjustments in 
the  current  period's  net  product  sales.  Refer  to  the  "Results  of  Operations  -  Revenues  -  Net  Product  Sales"  section  below  for 
further details regarding our provisions, and credits/payments, for sales-related deductions.

Collaborative Arrangements 

We have entered into various collaborative arrangements to research, develop, manufacture, and commercialize products and/or 
product candidates. Our collaboration agreements may require us to deliver various rights, services, and/or goods across the entire 
life cycle of a product or product candidate. In agreements involving multiple goods or services promised to be transferred to our 
collaborator, we assess, at the inception of the contract, whether each promise represents a separate obligation (i.e., is "distinct"), 
or  whether  such  promises  should  be  combined  as  a  single  unit  of  account.  When  we  have  a  combined  unit  of  account  which 
includes  a  license  and  providing  research  and  development  services  to  our  collaborator,  recognition  of  up-front  payments  and 
development milestones earned from our collaborator is deferred (as a liability) and recognized over the development period (i.e., 
over  time)  typically  using  an  input  method  on  the  basis  of  our  research  and  development  costs  incurred  relative  to  the  total 
expected  cost  which  determines  the  extent  of  our  progress  toward  completion.  We  review  our  estimates  each  period  and  make 
revisions to such estimates as necessary. Due to the variability in the scope of activities and length of time necessary to develop a 
drug  product,  potential  delays  in  development  programs,  changes  to  development  plans  and  budgets  as  programs  progress, 
including  if  we  and  our  collaborators  decide  to  expand  or  contract  our  clinical  plans  for  a  drug  candidate  in  various  disease 
indications, and uncertainty in the ultimate requirements to obtain governmental approval for commercialization, revisions to our 
estimates are likely to occur periodically, potentially resulting in material changes to amounts recognized. 

If  our  collaborator  performs  research  and  development  work  or  commercialization-related  activities  and  the  parties  share  the 
related  costs,  we  also  recognize,  as  expense  (e.g.,  research  and  development  expense  or  selling,  general  and  administrative 
expense, as applicable) in the period when our collaborator incurs such expenses, the portion of the collaborator's expenses that 
we  are  obligated  to  reimburse.  Our  collaborators  provide  us  with  estimated  expenses  for  the  most  recent  fiscal  quarter.  The 
estimates are revised, if necessary, in subsequent periods if actual expenses differ from those estimates.

Under  certain  of  the  Company's  collaboration  agreements,  product  sales  and  cost  of  sales  may  be  recorded  by  the  Company's 
collaborators as they are deemed to be the principal in the transaction. In arrangements where we:

•

•

•

supply  commercial  product  to  our  collaborator,  we  may  be  reimbursed  for  our  manufacturing  costs  as  commercial 
product  is  shipped  to  the  collaborator  (however,  recognition  of  such  cost  reimbursements  may  be  deferred  until  the 
product is sold by our collaborator to third-party customers); 
share in any profits or losses arising from the commercialization of such products, we record our share of the variable 
consideration, representing net product sales less cost of goods sold and shared commercialization and other expenses, in 
the period in which such underlying sales occur and costs are incurred by the collaborator; 
receive royalties and/or sales-based milestone payments from our collaborator, we recognize such amounts in the period 
earned.

74

Our collaborators provide us with estimates of product sales and our share of profits or losses, as applicable, for each quarter. The 
estimates are revised, if necessary, in subsequent periods if our actual share of profits or losses differ from those estimates.  

Stock-based Compensation

We  recognize  stock-based  compensation  expense  for  equity  grants  under  our  long-term  incentive  plans  to  employees  and  non-
employee members of our board of directors (as applicable) based on the grant-date fair value of those awards. The grant-date fair 
value  of  an  award  is  generally  recognized  as  compensation  expense  over  the  award's  requisite  service  period.  Stock-based 
compensation expense also includes an estimate, which is made at the time of grant, of the number of awards that are expected to 
be  forfeited.  This  estimate  is  revised,  if  necessary,  in  subsequent  periods  if  actual  forfeitures  differ  from  those  estimates.  In 
addition,  we  reassess  our  forfeiture  rate  assumptions  at  least  annually,  considering  both  historical  forfeiture  experience  and  an 
estimate  of  future  forfeitures  for  currently  outstanding  unvested  awards.  The  assumptions  used  in  computing  the  fair  value  of 
equity  awards  reflect  our  best  estimates  but  involve  uncertainties  related  to  market  and  other  conditions,  many  of  which  are 
outside our control. Changes in any of these assumptions may materially affect the fair value of awards granted and the amount of 
stock-based compensation recognized in future periods. 

We  use  the  Black-Scholes  model  to  compute  the  estimated  fair  value  of  stock  option  awards.  Using  this  model,  fair  value  is 
calculated based on assumptions with respect to (i) expected volatility of our Common Stock price, (ii) the periods of time over 
which employees and members of our board of directors are expected to hold their options prior to exercise (expected lives), (iii) 
expected dividend yield on our Common Stock, and (iv) risk-free interest rates, which are based on quoted U.S. Treasury rates for 
securities with maturities approximating the options' expected lives. Expected volatility is estimated based on actual movements 
in our stock price over the most recent historical periods equivalent to the options' expected lives. Expected lives are principally 
based on our historical exercise experience with previously issued employee and board of director option grants. The expected 
dividend yield is zero as we have never paid dividends and do not currently have plans to do so. 

We use a Monte Carlo simulation to compute the estimated fair value of performance-based restricted stock units that are subject 
to vesting based on the Company's attainment of pre-established criteria that include a market condition. 

For  performance-based  restricted  stock  units  that  contain  a  performance  condition,  we  recognize  stock-based  compensation 
expense if and when we determine that it is probable the performance condition will be achieved (based on the number of shares 
expected to be vested and issued). We reassess the probability of achievement at each reporting period and adjust compensation 
cost, as necessary. If there are any changes in our probability assessment, we recognize a cumulative catch-up adjustment in the 
period of the change in estimate, with the remaining unrecognized expense recognized prospectively over the remaining requisite 
service period. If we subsequently determine that the performance criteria are not met or are not expected to be met, any amounts 
previously recognized as compensation expense are reversed in the period when such determination is made.

See  Note  13  to  our  Consolidated  Financial  Statements  for  stock-based  compensation  expense  and  related  assumptions  used  in 
determining the fair value of our awards.

Income Taxes

We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the 
financial  statements  or  tax  returns,  including  deferred  tax  assets  and  liabilities  for  expected  amounts  of  global  intangible  low-
taxed income ("GILTI") inclusions. Deferred tax assets and liabilities are determined as the difference between the tax basis of 
assets and liabilities and their respective financial reporting amounts ("temporary differences") at enacted tax rates in effect for the 
years in which the differences are expected to reverse. A valuation allowance is established for deferred tax assets for which it is 
more likely than not that some portion or all of the deferred tax assets will not be realized. We periodically re-assess the need for a 
valuation allowance against our deferred tax assets based on all available evidence, including scheduled reversals of deferred tax 
liabilities,  projected  future  taxable  income,  tax  planning  strategies,  results  of  recent  operations,  and  our  historical  earnings 
experience by taxing jurisdiction. Significant judgment is required in making this assessment. 

We recognize the financial statement effects of a tax position when our assessment is that there is more than a 50% probability 
that the position will be sustained upon examination by a taxing authority based upon its technical merits. Uncertain tax positions 
are recorded based upon certain recognition and measurement criteria. Significant judgment is required in making this assessment, 
and, therefore, we re-evaluate uncertain tax positions and consider various factors, including, but not limited to, changes in tax 
law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to 
audit, information obtained during in-process audit activities, and changes in facts or circumstances related to a tax position. We 
adjust  the  amount  of  the  liability  to  reflect  any  subsequent  changes  in  the  relevant  facts  and  circumstances  surrounding  the 
uncertain tax positions. 

75

Inventories

We capitalize inventory costs associated with our products prior to regulatory approval when, based on management's judgment, 
future commercialization is considered probable and the future economic benefit is expected to be realized; otherwise, such costs 
are expensed. The determination to capitalize inventory costs is based on various factors, including status and expectations of the 
regulatory approval process, any known safety or efficacy concerns, potential labeling restrictions, and any other impediments to 
obtaining regulatory approval. 

We periodically analyze our inventory levels to identify inventory that may expire prior to expected sale or has a cost basis in 
excess of its estimated realizable value, and write down such inventories as appropriate. In addition, our products are subject to 
strict  quality  control  and  monitoring  which  we  perform  throughout  the  manufacturing  process.  If  certain  batches  or  units  of 
product  no  longer  meet  quality  specifications  or  become  obsolete  due  to  expiration,  we  record  a  charge  to  write  down  such 
inventory to its estimated realizable value. 

See "Results of Operations - Expenses - Cost of Goods Sold" below for further information related to our inventory write-offs and 
reserves.

Acquisitions

We make certain judgments to determine whether a transaction should be accounted for as a business combination or as an asset 
acquisition.  In  a  business  combination,  the  acquisition  method  of  accounting  generally  requires  that  the  assets  acquired  and 
liabilities assumed be recorded as of the date of the acquisition at their respective fair values. There can be significant judgment 
involved in determining the estimated fair values of such assets and liabilities. Amounts allocated to acquired in-process research 
and development are capitalized as indefinite-lived intangible assets. Any excess of the purchase price (consideration transferred) 
over the fair values of net assets acquired is recorded as goodwill. In a business combination, contingent consideration obligations 
are recorded at fair value as of the acquisition date and remeasured each subsequent reporting period until the contingencies have 
been resolved. The fair value of contingent consideration liabilities is determined using inputs that may include the probability of 
achieving certain milestones and estimated discount rates.

If it is determined that the assets acquired do not meet the definition of a business, or if substantially all of the fair value of the 
assets acquired are concentrated in a single identifiable asset, then the transaction is accounted for as an asset acquisition rather 
than a business combination. In an asset acquisition, assets acquired are recorded at cost, goodwill is not recorded, and acquired 
in-process research and development with no alternative future use is charged to expense.

Intangible Assets

Intangible assets acquired in a business combination are recorded at fair value, while intangible assets acquired in connection with 
an asset acquisition are recorded at cost. 

Payments to acquire intangible assets in an asset acquisition may include up-front payments and contingent consideration. With 
regard  to  contingent  consideration  in  an  asset  acquisition,  the  Company  recognizes  regulatory  milestones  upon  achievement, 
royalties in the period in which the underlying sales occur, and sales-based milestones when the milestone is deemed probable by 
the  Company  of  being  achieved.  If  contingent  consideration  is  recognized  subsequent  to  the  acquisition  date  in  an  asset 
acquisition, the amount of such consideration is recorded as an addition to the cost basis of the intangible asset with a cumulative 
catch-up adjustment for amortization expense as if the additional amount of consideration had been accrued from the outset of the 
acquisition.

Indefinite-lived intangible assets are subject to impairment testing until completion or abandonment of the associated research and 
development  efforts.  Definite-lived  intangible  assets  are  amortized  over  the  estimated  useful  lives  of  the  assets  based  on  the 
pattern  in  which  the  economic  benefits  of  the  intangible  assets  are  consumed;  if  that  pattern  cannot  be  reliably  determined,  a 
straight-line basis is used.

Intangible  assets  are  reviewed  for  recoverability  whenever  events  or  changes  in  circumstances  (e.g.,  changes  in  economic, 
regulatory,  or  legal  conditions)  indicate  that  the  carrying  amount  of  the  asset  may  not  be  recoverable.  If  an  indicator  of 
impairment  exists,  we  compare  the  projected  undiscounted  cash  flows  to  be  generated  by  the  asset  to  the  intangible  asset's 
carrying amount. If the projected undiscounted cash flows of the intangible asset are less than the carrying amount, the intangible 
asset is written down to its fair value in the period in which the impairment occurs.

76

Contingencies

We accrue, based on management's judgment, for an estimated loss when the potential loss from claims or legal proceedings is 
considered  probable  and  the  amount  can  be  reasonably  estimated.  As  additional  information  becomes  available,  or,  based  on 
specific  events  such  as  the  outcome  of  litigation  or  settlement  of  claims,  we  reassess  the  potential  liability  related  to  pending 
claims and litigation, and may change our estimates. 

Results of Operations 

Net Income

(In millions, except per share data)

2023

2022

2021

Year Ended December 31,

Revenues

Operating expenses

Income from operations

Other income (expense)

Income before income taxes

Income tax expense

Net income

$  13,117.2  $  12,172.9  $  16,071.7 

9,070.1 

4,047.1 

152.2 

4,199.3 

245.7 

7,434.0 

4,738.9 

119.9 

4,858.8 

520.4 

7,124.9 

8,946.8 

379.0 

9,325.8 

1,250.5 

$ 

3,953.6  $ 

4,338.4  $ 

8,075.3 

Net income per share - diluted

$ 

34.77  $ 

38.22  $ 

71.97 

77

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenues

(In millions)

Net product sales:

EYLEA HD - U.S.
EYLEA - U.S.

Total EYLEA HD and EYLEA - U.S.

Libtayo - U.S.
Libtayo - ROW*

Total Libtayo - Global

Praluent - U.S.

REGEN-COV - U.S.

Evkeeza - U.S.

Inmazeb - U.S.
ARCALYST - U.S.**
Total net product sales

Collaboration revenue:

Sanofi

Bayer

Roche

Other

Other revenue
Total revenues

Year Ended December 31,
2022

2023

2021

2023 vs. 2022

2022 vs. 2021

$ Change

$ 

165.8  $ 

—  $ 

—  $ 

5,719.6 

5,885.4 

6,264.6 

6,264.6 

538.8 

324.3 
863.1 
182.4 

— 

77.3 

69.8 

— 

374.5 

73.0 
447.5 
130.0 

— 

48.6 

3.0 

— 

5,792.3 

5,792.3 

306.3 

— 
306.3 
170.0 

5,828.0 

18.4 

— 

2.2 

165.8  $ 
(545.0)   

(379.2)   

164.3 

251.3 
415.6 
52.4 

— 

28.7 

66.8 

— 

— 
472.3 

472.3 

68.2 

73.0 
141.2 
(40.0) 

(5,828.0) 

30.2 

3.0 

(2.2) 

$ 

7,078.0  $ 

6,893.7  $ 

12,117.2  $ 

184.3  $ 

(5,223.5) 

$ 

3,799.5  $ 

2,855.7  $ 

1,902.2  $ 

943.8  $ 

1,487.5 

1,430.7 

211.0 

5.1 

627.3 

0.4 

1,409.3 

361.8 

— 

56.8 

(416.3)   

4.7 

953.5 

21.4 

265.5 

0.4 

536.1 
13,117.2  $ 

365.1 
12,172.9  $ 

281.2 
16,071.7  $ 

$ 

171.0 
944.3  $ 

83.9 
(3,898.8) 

* Effective July 1, 2022, the Company became solely responsible for the research, development, and commercialization of Libtayo 
worldwide and began recording net product sales of Libtayo outside the United States.
** Effective April 1, 2021, Kiniksa records net product sales of ARCALYST in the United States. Previously, the Company recorded net 
product sales of ARCALYST in the United States.

Net Product Sales

Net  product  sales  of  EYLEA  in  the  United  States  decreased  in  2023,  compared  to  2022,  primarily  due  to  changing  market 
dynamics, resulting in a lower net selling price and lower volumes. EYLEA volumes in 2023 were impacted by the August 2023 
launch of EYLEA HD and subsequent transition of EYLEA patients to EYLEA HD.

During the year ended December 31, 2021, we recorded net product sales of REGEN-COV in connection with our agreements 
with the U.S. government. As of December 31, 2021, the Company had completed its final deliveries of drug product under its 
agreements with the U.S. government; as a result, there were no net product sales of REGEN-COV in the United States recorded 
during the years ended December 31, 2023 and 2022. 

78

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue from product sales is recorded net of applicable provisions for rebates, chargebacks, and discounts; distribution-related 
fees; and other sales-related deductions. The following table summarizes the provisions, and credits/payments, for sales-related 
deductions.

(In millions)

Rebates, 
Chargebacks,
and Discounts

Distribution-
Related Fees

Other Sales-
Related 
Deductions

Balance as of December 31, 2020

$ 

202.2  $ 

77.2  $ 

44.8  $ 

Provisions

Credits/payments

Balance as of December 31, 2021

Provisions

Credits/payments

Balance as of December 31, 2022

Provisions

Credits/payments

1,047.1 

(1,034.7)   

214.6 

1,537.3 

363.6 

(360.8)   

80.0 

431.1 

353.9 

2,074.5 

(1,972.7)   

Total

324.2 

1,561.1 

150.4 

(127.6)   

(1,523.1) 

67.6 

141.1 

362.2 

2,109.5 

111.4 

439.2 

(388.3)   

162.3  $ 

81.5 

155.3 

546.8 

2,669.0 

(157.5)   

(2,518.5) 

79.3  $ 

697.3 

Year Ended December 31,
2022

2021

2023

Balance as of December 31, 2023

$ 

455.7  $ 

Sanofi Collaboration Revenue

(In millions)
Antibody:

(1,398.0)   

(399.7)   

(127.2)   

(1,924.9) 

Regeneron's share of profits in connection with 

commercialization of antibodies

Sales-based milestones earned
Reimbursement for manufacturing of commercial supplies(a)
Other

Total Antibody

Total Immuno-oncology(b)
Total Sanofi collaboration revenue

$ 

3,136.5  $ 
50.0 
613.0 
— 
3,799.5 

2,082.0  $ 
100.0 
633.7 
28.7 
2,844.4 

1,363.0 
50.0 
488.8 
— 
1,901.8 

— 
3,799.5  $ 

11.3 
2,855.7  $ 

0.4 
1,902.2 

$ 

(a) Corresponding costs incurred by the Company in connection with such production is recorded within Cost of 
collaboration and contract manufacturing.
(b) As the A&R IO LCA became effective July 1, 2022, the three months ended June 30, 2022 was the last quarter in 
which Sanofi collaboration revenue was recognized in connection with the IO Collaboration.

Antibody

Global net product sales of Dupixent and Kevzara are recorded by Sanofi in connection with the Antibody Collaboration, and we 
and Sanofi share profits on such sales. As described in Part I, Item 1. "Business - Collaboration, License, and Other Agreements - 
Sanofi  -  Antibody",  on  July  1,  2022,  an  amendment  to  the  LCA  became  effective,  pursuant  to  which  the  percentage  of 
Regeneron's share of profits in any calendar quarter used to reimburse Sanofi for development costs which were funded by Sanofi 
increased from 10% to 20%. 

79

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regeneron's share of profits in connection with the commercialization of Dupixent and Kevzara is summarized below:

(In millions)
Dupixent and Kevzara net product sales
Regeneron's share of collaboration profits
Reimbursement of development expenses incurred by Sanofi 

in accordance with Regeneron's payment obligation(a)
One-time payment in connection with amendment to the 

Antibody License and Collaboration Agreement

Regeneron's share of profits in connection with 

commercialization of antibodies 

Year Ended December 31,
2022
$  9,039.2 
  2,405.5 

2021
$  6,536.3 
1,511.5 

2023
$ 11,974.0 
  3,596.3 

(459.8) 

(266.6) 

(148.5) 

— 

(56.9) 

— 

$  3,136.5 

$  2,082.0 

$  1,363.0 

Regeneron's share of profits as a percentage of Dupixent and 

Kevzara net product sales

 26 %

 23 %

 21 %

(a) See "Liquidity and Capital Resources - Additional Funding Requirements" below for additional details on 
our contingent reimbursement obligation.

The increase in our share of profits in connection with commercialization of antibodies during the year ended December 31, 2023, 
compared to 2022, was driven by higher profits associated with Dupixent sales, partly offset by the impact of the amendment to 
the LCA. 

During the year ended December 31, 2023, the Company earned the final $50.0 million sales-based milestone from Sanofi, upon 
aggregate  annual  sales  of  antibodies  outside  the  United  States  (including  Praluent)  exceeding  $3.0  billion  on  a  rolling  twelve-
month  basis.  During  the  year  ended  December  31,  2022,  the  Company  earned  two  $50.0  million  sales-based  milestones  from 
Sanofi,  upon  aggregate  annual  sales  of  antibodies  outside  the  United  States  (including  Praluent)  exceeding  $2.0  billion  and 
$2.5 billion, respectively, on a rolling twelve-month basis. 

Reimbursements for manufacturing of commercial supplies primarily relate to Dupixent and are recognized when the product is 
sold by Sanofi to third-party customers; such reimbursements decreased during the year ended December 31, 2023, compared to 
2022, primarily due to lower manufacturing costs resulting from the transition to a higher-yielding manufacturing process.

Bayer Collaboration Revenue

(In millions)
Regeneron's share of profits in connection with 

commercialization of EYLEA outside the United States
Reimbursement for manufacturing of ex-U.S. commercial 

supplies(a)

One-time payment in connection with change in Japan 

arrangement(b)

Total Bayer collaboration revenue

Year Ended December 31,
2022

2021

2023

$ 

1,376.4  $ 

1,317.4  $ 

1,349.2 

111.1 

91.4 

60.1 

— 
1,487.5  $ 

21.9 
1,430.7  $ 

— 
1,409.3 

$ 

(a) Corresponding costs incurred by the Company in connection with such production is recorded within Cost of 
collaboration and contract manufacturing.
(b) Effective January 1, 2022, the Company and Bayer commenced sharing equally in profits based on sales 
from Bayer to its distributor in Japan. Previously, the Company received from Bayer a tiered percentage of 
sales based on sales by Bayer's distributor in Japan.

80

 
 
 
 
 
 
 
 
 
 
 
 
 
Bayer  records  net  product  sales  of  EYLEA  outside  the  United  States.  Regeneron's  share  of  profits  in  connection  with 
commercialization of EYLEA outside the United States is summarized below: 

(In millions)

EYLEA net product sales outside the United States 
Regeneron's share of collaboration profit from sales outside 

the United States

Reimbursement of development expenses incurred by Bayer 
in accordance with Regeneron's payment obligation(a) 

Regeneron's share of profits in connection with 

Year Ended December 31,
2022

2021

2023

$ 

3,495.2  $ 

3,382.8  $ 

3,450.9 

$ 

1,436.1  $ 

1,375.1  $ 

1,408.3 

(59.7)   

(57.7)   

(59.1) 

commercialization of EYLEA outside the United States

$ 

1,376.4  $ 

1,317.4  $ 

1,349.2 

Regeneron's share of profits as a percentage of EYLEA net 

product sales outside the United States

 39 %

 39 %

 39 %

(a) See "Liquidity and Capital Resources - Additional Funding Requirements" below for additional details on 
our contingent reimbursement obligation.

Roche Collaboration Revenue

(In millions)
Global gross profit payment from Roche in connection with sales 

of REGEN-COV and Ronapreve

Other

Total Roche collaboration revenue 

Year Ended December 31,
2021
2022
2023

$ 

224.3  $ 

627.3  $ 

361.8 

(13.3)   

— 

— 

$ 

211.0  $ 

627.3  $ 

361.8 

Roche distributes and records net product sales of Ronapreve outside the United States, and the parties share gross profits from 
worldwide sales.

Other Revenue

Other revenue in 2023 included the recognition of $50.4 million of revenue in connection with our August 2023 agreement with 
BARDA to fund certain costs for a next-generation COVID-19 monoclonal antibody therapy for the prevention of SARS-CoV-2 
infection. In addition, Other revenue increased in 2023, compared to 2022, primarily due to the following:

•

•

•

higher  reimbursements  for  the  manufacture  of  commercial  supplies  for  Sanofi  related  to  Praluent  outside  the  United 
States;
higher share of profits earned in connection with sales of ARCALYST pursuant to our license agreement with Kiniksa 
Pharmaceuticals, Ltd.; and
royalties earned in connection with our license agreement with Novartis, under which we receive royalties on worldwide 
sales of Novartis' Ilaris® (canakinumab).

81

 
 
 
Expenses

(In millions, except headcount data)
Research and development(a)
Acquired in-process research and 

development

Selling, general, and administrative(a)
Cost of goods sold
Cost of collaboration and contract 

manufacturing(b)

Other operating (income) expense, net
Total operating expenses

Year Ended December 31,
2022

2023

2021

$  4,439.0  $  3,592.5  $  2,860.1  $ 

186.1 
2,631.3 
932.1 

255.1 
2,115.9 
800.0 

48.0 
1,824.9 
1,773.1 

883.7 

664.4 
(45.6)   
$  9,070.1  $  7,434.0  $  7,124.9  $ 

760.4 
(89.9)   

(2.1)   

Change

2023 vs. 2022

2022 vs. 2021
732.4 

846.5  $ 

(69.0)   
515.4 
132.1 

123.3 
87.8 
1,636.1  $ 

207.1 
291.0 
(973.1) 

96.0 
(44.3) 
309.1 

Average headcount

12,698 

11,115 

9,884 

1,583 

1,231 

(a) Includes costs incurred net of any cost reimbursements from collaborators who are not deemed to be our customers
(b) Includes costs incurred in connection with producing commercial drug supplies for collaborators and others

Operating  expenses  in  2023  and  2022  included  a  total  of  $885.0  million  and  $725.0  million,  respectively,  of  stock-based 
compensation  expense  related  to  equity  awards  granted  under  our  long-term  incentive  plans.  As  of  December  31,  2023, 
unrecognized  stock-based  compensation  expense  related  to  unvested  stock  options  and  unvested  restricted  stock  (including 
performance-based restricted stock units) was $589.6 million and $1.127 billion, respectively. We expect to recognize this stock-
based  compensation  expense  related  to  stock  options  and  restricted  stock  over  weighted-average  periods  of  1.8  years  and  2.3 
years, respectively.

82

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Research and Development Expenses

The  following  table  summarizes  our  direct  research  and  development  expenses  by  clinical  development  program  and  other 
significant categories of research and development expenses. Direct research and development expenses are comprised primarily 
of  costs  paid  to  third  parties  for  clinical  and  product  development  activities,  including  costs  related  to  preclinical  research 
activities, clinical trials, and the portion of research and development expenses incurred by our collaborators that we are obligated 
to reimburse. Indirect research and development expenses have not been allocated directly to each program, and primarily consist 
of costs to compensate personnel, overhead and infrastructure costs to maintain our facilities, and other costs related to activities 
that benefit multiple projects. Clinical manufacturing costs primarily consist of costs to manufacture bulk drug product for clinical 
development  purposes  as  well  as  related  drug  filling,  packaging,  and  labeling  costs.  Clinical  manufacturing  costs  also  includes 
pre-launch commercial supplies which did not meet the criteria to be capitalized as inventory (see "Critical Accounting Policies 
and Use of Estimates - Inventories" above). The table below also includes reimbursements of research and development expenses 
by  collaborators,  as  when  we  are  entitled  to  reimbursement  of  all  or  a  portion  of  such  expenses  that  we  incur  under  a 
collaboration, we record those reimbursable amounts in the period in which such costs are incurred.

development and other research programs
Total direct research and development expenses

514.0 
1,295.6 

393.9 
1,042.9 

429.7 
1,196.2 

(In millions)

Direct research and development expenses:

Dupixent (dupilumab)

Fianlimab

Libtayo (cemiplimab)

Odronextamab
EYLEA HD (aflibercept) 8 mg

Linvoseltamab

Itepekimab

Pozelimab

REGEN-COV
Other product candidates in clinical 

Indirect research and development expenses:

Payroll and benefits
Lab supplies and other research and 

development costs

Occupancy and other operating costs
Total indirect research and development 

expenses

Year Ended December 31,
2022*

2021*

2023

$ Change

2023 vs. 2022

2022 vs. 2021

$ 

168.0  $ 

156.5  $ 

146.4  $ 

11.5  $ 

112.2 

105.3 

96.3 
96.2 

78.7 

70.3 

60.2 

(5.6)   

43.4 

138.0 

66.0 
67.9 

45.5 

26.5 

72.4 

32.8 

8.7 

146.2 

34.9 
73.5 

18.7 

— 

28.3 

309.8 

1,537.0 

1,195.5 

981.4 

341.5 

214.1 

210.6 

518.2 

181.0 

508.5 

142.0 

414.9 

2,265.8 

1,885.0 

1,538.3 

68.8 

(32.7)   

30.3 
28.3 

33.2 

43.8 

(12.2)   

(38.4)   

120.1 
252.7 

29.6 

9.7 

380.8 

115.6 

10.1 

34.7 

(8.2) 

31.1 
(5.6) 

26.8 

26.5 

44.1 

(277.0) 

(35.8) 
(153.3) 

39.0 

93.6 

346.7 

316.6 

222.4 

732.4 

Clinical manufacturing costs

1,053.9 

938.3 

621.7 

Reimbursement of research and development 

expenses by collaborators

(176.3)   

(273.7)   

(496.1)   

97.4 

Total research and development expenses

$  4,439.0  $  3,592.5  $  2,860.1  $ 

846.5  $ 

* Certain prior year amounts have been reclassified to conform to the current year's presentation.

83

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total research and development expenses increased in 2023, compared to 2022, partially due to the impact of the amendments to 
the  Sanofi  collaboration  agreements  (which  were  effective  July  1,  2022)  described  above  in  Part  I,  Item  1.  "Business  - 
"Collaboration,  License,  and  Other  Agreements  -  Sanofi",  as  (i)  Sanofi  is  no  longer  reimbursing  us  for  50%  of  Libtayo 
development costs (such reimbursements were previously included in Reimbursement of research and development expenses by 
collaborators in the table above) and (ii) we recognize our 50% share of research and development expenses in connection with 
the Sanofi Antibody Collaboration.

Research and development expenses included stock-based compensation expense of $488.7 million and $406.8 million in 2023 
and 2022, respectively. 

There  are  numerous  uncertainties  associated  with  drug  development,  including  uncertainties  related  to  safety  and  efficacy  data 
from  each  phase  of  drug  development,  uncertainties  related  to  the  enrollment  and  performance  of  clinical  trials,  changes  in 
regulatory  requirements,  changes  in  the  competitive  landscape  affecting  a  product  candidate,  and  other  risks  and  uncertainties 
described  in  Part  I,  Item  1A.  "Risk  Factors."  There  is  also  variability  in  the  duration  and  costs  necessary  to  develop  a 
pharmaceutical product, potential opportunities and/or uncertainties related to future indications to be studied, and the estimated 
cost and scope of the projects. The lengthy process of seeking FDA and other applicable approvals, and subsequent compliance 
with applicable statutes and regulations, require the expenditure of substantial resources. Any failure by us to obtain, or delay in 
obtaining,  regulatory  approvals  could  materially  adversely  affect  our  business.  We  are  unable  to  reasonably  estimate  if  our 
product candidates in clinical development will generate material product revenues and net cash inflows.

Acquired In-process Research and Development ("IPR&D")

Acquired IPR&D in 2023 included:

•

•
•

$100.0  million  charge  in  connection  with  a  development  milestone  for  the  Phase  1  ALN-APP  program,  which  is  in 
collaboration with Alnylam;
$45.0 million up-front payment in connection with our collaboration agreement with Sonoma Biotherapeutics, Inc.; and 
$30.0 million charge to extend the period for selecting targets under our collaboration agreement with Intellia.

Acquired IPR&D in 2022 included: 

•
•
•

$195.0 million charge related to our acquisition of Checkmate Pharmaceuticals, Inc.;
$30.0 million up-front payment in connection with our collaboration agreement with CytomX Therapeutics, Inc.; and
$20.0 million opt-in payment in connection with a product candidate under our collaboration agreement with Adicet Bio, 
Inc.

Selling, General, and Administrative Expenses

Selling,  general,  and  administrative  expenses  increased  in  2023,  compared  to  2022,  primarily  due  to  higher  headcount  and 
headcount-related  costs,  an  increase  in  commercialization-related  expenses  for  Libtayo  (including  acquisition  and  integration-
related  costs  for  Libtayo  outside  the  United  States  as  effective  July  1,  2022,  the  Company  became  solely  responsible  for  the 
commercialization of Libtayo worldwide), and, to a lesser extent, commercialization-related expenses for various other products, 
and  higher  contributions  to  an  independent  not-for-profit  patient  assistance  organization.  Selling,  general,  and  administrative 
expenses also included $307.1 million and $256.4 million of stock-based compensation expense in 2023 and 2022, respectively.

Cost of Goods Sold 

Cost of goods sold increased in 2023, compared to 2022, primarily due to higher start-up costs for our Rensselaer, New York fill/
finish facility and an increase in period costs at our manufacturing facilities resulting from lower production volumes, partly offset 
by  lower  inventory  write-offs  and  reserves.  Inventory  write-offs  and  reserves  were  $102.3  million  in  2023  compared  to 
$258.7 million in 2022. The inventory write-offs and reserves in 2022 were primarily related to REGEN-COV.

Cost of Collaboration and Contract Manufacturing

Cost of collaboration and contract manufacturing increased in 2023, compared to 2022, primarily due to the recognition of costs 
in  connection  with  manufacturing  commercial  supplies  for  Sanofi  related  to  Praluent  outside  the  United  States  and  for  Bayer 
related to EYLEA outside the United States. This increase was partly offset by lower Dupixent manufacturing costs as a result of 
the transition to a higher-yielding manufacturing process.

84

Other Operating (Income) Expense

Other operating (income) expense, net, in 2022 included the recognition of amounts previously deferred in connection with up-
front  and  development  milestone  payments,  as  applicable,  received  in  connection  with  our  Sanofi  IO,  Teva,  and  Mitsubishi 
Tanabe  Pharma  Corporation  ("MTPC")  collaborative  arrangements.  As  we  discontinued  further  clinical  development  of 
fasinumab (for which we had collaborative arrangements with Teva and MTPC) during 2022, and the A&R IO LCA with Sanofi 
became  effective  July  1,  2022,  no  such  amounts  were  recognized  in  connection  with  these  collaborative  arrangements  during 
2023.

Other Income (Expense)

Other income (expense) consists of the following:

(In millions)
Unrealized (losses) gains on equity securities, net
Interest income
Foreign currency (losses) gains
Other
Other income (expense), net

2021

$ 

Year Ended December 31,
2022
(39.8) 
160.1 
50.2 
8.8 
179.3 

2023
$  (237.8) 
495.9 
(12.9) 
(20.0) 
225.2 

$ 

386.1 
45.8 
0.4 
4.0 
436.3 

Interest expense
Total other income (expense)

(73.0)   
152.2  $ 

(59.4)   
119.9  $ 

(57.3) 
379.0 

$ 

The increase in interest income in 2023, compared to 2022, was primarily driven by higher interest rates.

Income Taxes

(In millions, except effective tax rate)

Income tax expense

Effective tax rate

Year Ended December 31,
2022

2023

2021

$ 

245.7 

$ 

520.4 

$  1,250.5 

 5.9 %

 10.7 %

 13.4 %

The Company's effective tax rate for 2023, compared to 2022, included a higher benefit from stock-based compensation, federal 
tax credits for research activities, and the proportion of income earned in foreign jurisdictions with tax rates lower than the U.S. 
federal statutory rate.

Certain countries in which we have operations, including Ireland, have adopted legislation influenced by the OECD Pillar Two 
rules, including a minimum tax rate of 15%. It is uncertain whether the United States will enact legislation to adopt the Pillar Two 
framework. While we do not expect the adoption of the Pillar Two framework to have a material impact on our effective tax rate, 
we  are  continuing  to  evaluate  additional  guidance  released  by  the  OECD,  along  with  the  pending  legislative  adoption  by 
additional individual countries.

85

 
 
 
 
 
 
 
 
 
 
 
 
 
Liquidity and Capital Resources

Our financial condition is summarized as follows:

(In millions)

Financial assets:

As of December 31,

2023

2022

$ Change

Cash and cash equivalents

$ 

2,730.0  $ 

3,105.9  $ 

Marketable securities - current 

Marketable securities - noncurrent

8,114.8 

5,396.5 

4,636.4 

6,591.8 

$ 

16,241.3  $ 

14,334.1  $ 

(375.9) 

3,478.4 

(1,195.3) 

1,907.2 

Working capital:

Current assets

Current liabilities

Borrowings and finance lease liabilities:

Long-term debt

Finance lease liabilities

$ 

$ 

$ 

$ 

19,479.2  $ 

3,423.4 

15,884.1  $ 
3,141.3 

16,055.8  $ 

12,742.8  $ 

3,595.1 

282.1 
3,313.0 

1,982.9  $ 

1,981.4  $ 

720.0  $ 

720.0  $ 

1.5 

— 

As  of  December  31,  2023,  we  also  had  borrowing  availability  of  $750.0  million  under  a  revolving  credit  facility  (see  further 
description under "Credit Facility" below).

Sources and Uses of Cash for the Years Ended December 31, 2023, 2022, and 2021 

(In millions)

Year Ended December 31,
2022

2021

2023

$ Change

2023 vs. 2022

2022 vs. 2021

Cash flows provided by operating activities

$  4,594.0  $  5,014.9  $  7,081.3  $ 

(420.9)  $ 

(2,066.4) 

Cash flows used in investing activities

$  (3,185.1)  $  (3,784.6)  $  (5,384.7)  $ 

599.5  $ 

1,600.1 

Cash flows used in financing activities

$  (1,790.1)  $  (1,009.0)  $  (1,005.8)  $ 

(781.1)  $ 

(3.2) 

Cash Flows from Operating Activities

As of December 31, 2023 and 2022, deferred tax assets increased by $837.8 million and $746.4 million, respectively, primarily 
related to the impact of the Tax Cuts and Jobs Act of 2017, which requires, for tax purposes, the capitalization and amortization of 
research and development expenses effective for years beginning after December 31, 2021.

As of December 31, 2021, Accounts receivable increased by $1.927 billion, compared to December 31, 2020, primarily due to 
REGEN-COV  sales  in  connection  with  our  September  2021  agreement  to  supply  drug  product  to  the  U.S.  government.  As  of 
December  31,  2022,  Accounts  receivable  had  decreased  by  $707.8  million,  compared  to  December  31,  2021,  driven  by  the 
Company's collection of amounts due from the U.S. government in connection with such sales in the fourth quarter of 2021. 

Other non-cash items, net, in 2022 and 2021 included inventory write-offs and reserves primarily related to REGEN-COV.

Cash Flows from Investing Activities

Capital expenditures in 2023 included costs incurred in connection with the expansion of our Tarrytown, New York location, as 
well  as  costs  associated  with  the  expansion  of  our  manufacturing  facilities  in  Rensselaer,  New  York  (including  the  ongoing 
construction of a fill/finish facility and related equipment). Additionally, capital expenditures in 2023 is net of grant proceeds of 
$60.0 million primarily related to the expansion of our facilities in New York. We expect to incur capital expenditures of $825 
million to $950 million in 2024 primarily in connection with the continued expansion of our research, preclinical manufacturing, 
and  support  facilities  at  our  Tarrytown,  New  York  campus  and  our  manufacturing  facilities.  We  expect  continued  significant 
capital expenditures over the next several years in connection with the planned expansion of our Tarrytown, New York campus.

86

 
 
 
 
 
 
 
 
 
Payments for the Libtayo intangible asset of $207.8 million and $1.027 billion in 2023 and 2022, respectively, were related to our 
acquisition (including contingent consideration paid) of the exclusive right to develop, commercialize, and manufacture Libtayo 
worldwide (as described in Part I, Item 1. "Collaboration, License, and Other Agreements - Sanofi - Immuno-Oncology" above). 

Acquisitions,  net  of  cash  acquired,  of  $54.9  million  and  $230.3  million  in  2023  and  2022  was  related  to  our  acquisitions  of 
Decibel Therapeutics, Inc. and Checkmate Pharmaceuticals, Inc., respectively. 

Cash Flows from Financing Activities

Proceeds from issuances of Common Stock, in connection with exercises of employee stock options, were $1.146 billion during 
2023, compared to $1.520 billion during 2022 and $1.672 billion during 2021. For information related to repurchases of Common 
Stock, see "Share Repurchase Programs" section below.

Credit Facility

In December 2022, we entered into an agreement with a syndicate of lenders (the "2022 Credit Agreement") which provides for a 
$750.0  million  senior  unsecured  five-year  revolving  credit  facility  (the  "2022  Credit  Facility")  and  replaced  the  then-existing 
credit agreement, which was contemporaneously terminated. The 2022 Credit Agreement includes an option for the Company to 
elect to increase the commitments under the 2022 Credit Facility and/or to enter into one or more tranches of term loans in the 
aggregate principal amount of up to $500.0 million, subject to the consent of the lenders providing the additional commitments or 
term  loans,  as  applicable,  and  certain  other  conditions.  The  2022  Credit  Agreement  also  provides  a  $50.0  million  sublimit  for 
letters of credit. 

As set forth in the 2022 Credit Agreement, we have the option to amend the 2022 Credit Agreement to establish environmental, 
social,  and  governance  targets  which  will  be  used  to  adjust  pricing  under  the  2022  Credit  Facility,  subject  to  parameters  to  be 
provided in the 2022 Credit Agreement.

Proceeds of the loans under the 2022 Credit Facility may be used to finance working capital needs, and for general corporate or 
other lawful purposes, of Regeneron and its subsidiaries. Regeneron Pharmaceuticals, Inc. has guaranteed all obligations under 
the 2022 Credit Facility. The 2022 Credit Agreement includes an option for us to elect to extend the maturity date of the 2022 
Credit  Facility  beyond  December  2027,  subject  to  the  consent  of  the  extending  lenders  and  certain  other  conditions.  Amounts 
borrowed under the 2022 Credit Facility may be prepaid, and the commitments under the 2022 Credit Facility may be terminated, 
at any time without premium or penalty. 

We had no borrowings outstanding under the 2022 Credit Facility as of December 31, 2023. 

The  2022  Credit  Agreement  contains  operating  covenants  and  a  maximum  total  leverage  ratio  financial  covenant.  We  were  in 
compliance with all covenants of the 2022 Credit Agreement as of December 31, 2023.

Share Repurchase Programs

In January 2021, our board of directors authorized a share repurchase program to repurchase up to $1.5 billion of our Common 
Stock. As of December 31, 2021, the Company had repurchased the entire $1.5 billion of its Common Stock that it was authorized 
to repurchase under the program.

In November 2021, our board of directors authorized a share repurchase program to repurchase up to $3.0 billion of our Common 
Stock. As of June 30, 2023, the Company had repurchased the entire $3.0 billion of its Common Stock that it was authorized to 
repurchase under the program.

In January 2023, our board of directors authorized an additional share repurchase program to repurchase up to $3.0 billion of our 
Common Stock. The share repurchase program permits the Company to make repurchases through a variety of methods, including 
open-market  transactions  (including  pursuant  to  a  trading  plan  adopted  in  accordance  with  Rule  10b5-1  of  the  Exchange  Act), 
privately  negotiated  transactions,  accelerated  share  repurchases,  block  trades,  and  other  transactions  in  compliance  with  Rule 
10b-18 of the Exchange Act. Repurchases may be made from time to time at management's discretion, and the timing and amount 
of  any  such  repurchases  will  be  determined  based  on  share  price,  market  conditions,  legal  requirements,  and  other  relevant 
factors. The program has no time limit and can be discontinued at any time. There can be no assurance as to the timing or number 
of  shares  of  any  repurchases  in  the  future.  As  of  December  31,  2023,  $1.531  billion  remained  available  for  share  repurchases 
under the program.

87

The table below summarizes the shares of our Common Stock we repurchased and the cost of the shares, which were recorded as 
Treasury Stock.

(In millions)

Number of shares 

Year Ended December 31,

2023

2022

2021

2.9 

3.3 

3.0 

Total cost of shares 

$ 

2,214.6  $ 

2,099.8  $ 

1,655.0 

Tarrytown, New York Lease

We are party to a Third Amended and Restated Lease and Remedies Agreement, dated March 27, 2023 (the "Third Amended and 
Restated Lease") with BA Leasing BSC, LLC, an affiliate of Banc of America Leasing & Capital, LLC ("BAL"), as lessor, which 
relates to our lease of laboratory and office facilities in Tarrytown, New York (the "Facility"); and a Third Amended and Restated 
Participation  Agreement,  dated  March  27,  2023  (the  "Third  Amended  and  Restated  Participation  Agreement")  with  Bank  of 
America,  N.A.,  as  administrative  agent  (the  "Administrative  Agent"),  and  a  syndicate  of  lenders  (collectively  with  BAL,  the 
"Participants"),  as  rent  assignees.  The  Third  Amended  and  Restated  Lease  and  Third  Amended  and  Restated  Participation 
Agreement provide for a March 2027 maturity date of the $720.0 million lease financing (previously advanced by the Participants 
in March 2017 in connection with the acquisition by BAL of the Facility and our lease of the Facility from BAL) and the end of 
the term of our lease of the Facility from BAL, at which time all amounts outstanding thereunder will become due and payable in 
full.

In accordance with the terms of the Third Amended and Restated Lease, we pay all maintenance, insurance, taxes, and other costs 
arising out of the use of the Facility. We are also required to make monthly payments of basic rent during the remaining term of 
the Third Amended and Restated Lease to satisfy the yield payable to the Participants on their outstanding advances under the 
Third Amended and Restated Participation Agreement. Such advances accrue yield at a variable rate per annum based on the one-
month  forward-looking  Secured  Overnight  Financing  Rate  ("SOFR")  term  rate,  plus  a  spread  adjustment,  plus  an  applicable 
margin that varies with our debt rating and total leverage ratio.

The Third Amended and Restated Participation Agreement and Third Amended and Restated Lease include an option for us to 
elect to further extend the maturity date of the Third Amended and Restated Participation Agreement and the term of the Third 
Amended  and  Restated  Lease  for  an  additional  five-year  period,  subject  to  the  consent  of  all  the  Participants  and  certain  other 
conditions. We also have the option prior to the end of the term of the Third Amended and Restated Lease to (a) purchase the 
Facility by paying an amount equal to the outstanding principal amount of the Participants' advances under the Third Amended 
and Restated Participation Agreement, all accrued and unpaid yield thereon, and all other outstanding amounts under the Third 
Amended and Restated Participation Agreement, Third Amended and Restated Lease, and certain related documents or (b) sell the 
Facility to a third party on behalf of BAL.

The Third Amended and Restated Lease is classified as a finance lease as we have the option to purchase the Facility under terms 
that  make  it  reasonably  certain  to  be  exercised.  The  agreements  governing  the  Third  Amended  and  Restated  Lease  financing 
contain  financial  and  operating  covenants.  Such  financial  covenants  and  certain  of  the  operating  covenants  are  substantially 
similar to the covenants set forth in our 2022 Credit Agreement. The Company was in compliance with all such covenants as of 
December 31, 2023.

Additional Funding Requirements

The  amount  required  to  fund  operations  will  depend  on  various  factors,  including  the  potential  regulatory  approval  and 
commercialization  of  our  product  candidates  and  the  timing  thereof  and  the  extent  and  cost  of  our  research  and  development 
programs. We believe that our existing capital resources, borrowing availability under the 2022 Credit Facility, funds generated 
by  anticipated  product  sales,  and  funding  for  reimbursement  of  research  and  development  costs  that  we  are  entitled  to  receive 
under our collaboration agreements, will enable us to meet our anticipated operating needs for the foreseeable future.

We expect to continue to incur significant costs in connection with our research and development activities (including preclinical 
and  clinical  programs).  The  amount  of  funding  that  will  be  required  for  our  clinical  programs  depends  upon  the  results  of  our 
research and preclinical programs and early-stage clinical trials, regulatory requirements, the duration and results of clinical trials 
underway  and  of  additional  clinical  trials  that  we  decide  to  initiate,  and  the  various  factors  that  affect  the  cost  of  each  trial, 
including the size of trials, fees charged for services provided by clinical trial investigators and other third parties, the costs for 
manufacturing the product candidate for use in the trials, and other expenses. 

88

 
 
 
We  also  anticipate  continuing  to  incur  substantial  commercialization  costs  for  our  marketed  products.  Commercialization  costs 
over  the  next  few  years  will  depend  on,  among  other  things,  the  market  potential  for  product  candidates,  whether 
commercialization costs are shared with a collaborator, and regulatory approval of additional product candidates.

We expect that expenses related to the filing, prosecution, defense, and enforcement of patents and other intellectual property will 
be substantial. 

Liabilities  for  unrecognized  tax  benefits  totaled  $696.4  million  as  of  December  31,  2023.  Due  to  their  nature,  there  is  a  high 
degree of uncertainty regarding the period and amounts of potential future cash settlement with tax authorities. See Note 15 to our 
Consolidated Financial Statements.

We enter into collaboration and licensing agreements that may require us to pay (i) amounts contingent upon the occurrence of 
various future events (e.g., upon the achievement of various development and commercial milestones), which, in the aggregate, 
could be significant, and/or (ii) royalties calculated based on a percentage of net product sales. The payment of these amounts, 
however, is contingent upon the occurrence of various future events, which have a high degree of uncertainty of occurring and for 
which the specific timing cannot be predicted. See Note 3 to our Consolidated Financial Statements.

As described in Part I, Item 1. "Collaboration, License, and Other Agreements," under our collaborations with Bayer and Sanofi, 
we  and  our  collaborator  share  profits  in  connection  with  commercialization  of  drug  products.  If  the  applicable  collaboration  is 
profitable, we have contingent contractual obligations to reimburse Bayer and Sanofi for a defined percentage (generally 50%) of 
agreed-upon  development  expenses  funded  by  Bayer  and  Sanofi  (i.e.,  "development  balance").  These  reimbursements  are 
deducted each quarter, in accordance with a formula, from our share of the collaboration profits otherwise payable to us, unless, in 
the case of Bayer, we elect to reimburse these expenses at a faster rate. As of December 31, 2023, our contingent reimbursement 
obligation to Bayer was approximately $293 million and our contingent reimbursement obligation to Sanofi in connection with 
the companies' Antibody Collaboration was approximately $2.330 billion. Therefore, we continue to expect that a portion of our 
share of profits from sales under our collaborations with Bayer and Sanofi will be used to reimburse our collaborators for these 
obligations.

Future Impact of Recently Issued Accounting Standards

See Note 1 to our Consolidated Financial Statements for a description of recently issued accounting standards.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

Interest Rate Risk

Our  earnings  and  cash  flows  are  subject  to  fluctuations  due  to  changes  in  interest  rates,  principally  in  connection  with  our 
investments in marketable securities, which consist primarily of corporate bonds and U.S. treasury securities. We do not believe 
we  are  materially  exposed  to  changes  in  interest  rates  related  to  our  investments,  and  we  do  not  currently  use  interest  rate 
derivative instruments to manage exposure to interest rate changes of our investments. We estimate that a 100 basis point, or 1%, 
unfavorable change in interest rates would have resulted in approximately a $98.7 million and $102.7 million decrease in the fair 
value of our investment portfolio as of December 31, 2023 and 2022, respectively. 

We  have  exposure  to  market  risk  for  changes  in  interest  rates,  including  the  interest  rate  risk  relating  to  our  variable  rate 
Tarrytown, New York lease (as described in Part II, Item 7. "Management's Discussion and Analysis of Financial Condition and 
Results of Operations - Liquidity and Capital Resources - Tarrytown, New York Leases"). Our interest rate exposure is offset by 
our investments in marketable securities. We continue to monitor our interest rate risk and may utilize derivative instruments and/
or other strategies in the future to further mitigate our interest rate exposure. 

Credit Quality Risk

We  have  an  investment  policy  that  includes  guidelines  on  acceptable  investment  securities,  minimum  credit  quality,  maturity 
parameters,  and  concentration  and  diversification.  Nonetheless,  deterioration  of  the  credit  quality  of  an  investment  security 
subsequent to purchase may subject us to the risk of not being able to recover the full principal value of the security. In 2023, 
2022, and 2021, we did not record any charges for credit-related impairments of our available-for-sale debt securities.

We are subject to credit risk associated with the receivables due from our collaborators, including Bayer and Sanofi. We are also 
subject  to  credit  risk  in  connection  with  trade  accounts  receivable  due  from  our  customers  from  our  product  sales.  We  have 
contractual  payment  terms  with  each  of  our  collaborators  and  customers.  We  also  monitor  financial  performance  and  credit 
worthiness so that we can properly assess and respond to any changes in collaborator and/or customer credit profiles. In 2023, 
2022, and 2021, we did not recognize any charges for write-offs and allowances of accounts receivable related to credit risk for 
our collaborators or customers. As of December 31, 2023, two customers accounted on a combined basis for 83% of our net trade 
accounts receivables.

89

Foreign Exchange Risk

As discussed further above, our collaborators market certain products outside the United States, and we share in profits and losses 
with these collaborators from commercialization of products. In addition, pursuant to the applicable terms of the agreements with 
our collaborators, we also share in certain worldwide development expenses incurred by our collaborators. 

We also incur worldwide development expenses for clinical products we are developing independently, incur expenses outside the 
United  States  in  connection  with  our  international  operations,  and,  effective  July  1,  2022,  market  Libtayo  outside  the  United 
States as a result of obtaining worldwide rights to Libtayo under an A&R IO LCA with Sanofi. 

Therefore, significant changes in foreign exchange rates of the countries outside the United States where our products are sold, 
where  development  expenses  are  incurred  by  us  or  our  collaborators,  or  where  we  incur  operating  expenses  may  impact  our 
operating results and financial condition. As sales outside the United States continue to grow, and as we expand our international 
operations,  we  will  continue  to  assess  potential  steps,  including  foreign  currency  hedging  and  other  strategies,  to  mitigate  our 
foreign exchange risk.  

Market Price Risk

We are exposed to price risk on equity securities included in our investment portfolio. Our investments include equity securities 
of companies with which we have entered into collaboration arrangements. Changes in the fair value of our equity investments are 
included in Other income (expense), net on the Statements of Operations. We recorded $237.8 million and $39.8 million of net 
unrealized losses on equity securities in Other income (expense), net in 2023 and 2022, respectively.

Item 8. Financial Statements and Supplementary Data

The information required by this Item is set forth beginning on page F-1 of this report and is incorporated herein by reference.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial officer, conducted an evaluation 
of the effectiveness of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) or 15d-15(e) under the 
Securities Exchange Act of 1934, as amended (the "Exchange Act")), as of the end of the period covered by this Annual Report 
on Form 10-K. Based on this evaluation, our principal executive officer and principal financial officer each concluded that, as of 
the end of such period, our disclosure controls and procedures were effective in ensuring that information required to be disclosed 
by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported on a timely 
basis, and is accumulated and communicated to our management, including our principal executive officer and principal financial 
officer, as appropriate to allow timely decisions regarding required disclosures.  

Management's Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is 
defined in Rules 13a-15(f) or 15d-15(f) under the Exchange Act. Our management conducted an evaluation of the effectiveness of 
our  internal  control  over  financial  reporting  as  of  December  31,  2023  using  the  framework  in  Internal  Control  -  Integrated 
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on that evaluation, 
our  management  has  concluded  that  our  internal  control  over  financial  reporting  was  effective  as  of  December  31,  2023.  The 
effectiveness  of  the  Company's  internal  control  over  financial  reporting  as  of  December  31,  2023  has  been  audited  by 
PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears under Part 
IV, Item 15. 

Because  of  its  inherent  limitations,  internal  control  over  financial  reporting  may  not  prevent  or  detect  misstatements.  Also, 
projections  of  any  evaluation  of  effectiveness  to  future  periods  are  subject  to  the  risk  that  controls  may  become  inadequate 
because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. 

Changes in Internal Control over Financial Reporting 

There has been no change in our internal control over financial reporting (as such term is defined in Rules 13a-15(f) or 15d-15(f) 
under  the  Exchange  Act)  during  the  quarter  ended  December  31,  2023  that  has  materially  affected,  or  is  reasonably  likely  to 
materially affect, our internal control over financial reporting.

90

Inherent Limitations on Effectiveness of Controls

Our  management,  including  our  principal  executive  officer  and  principal  financial  officer,  does  not  expect  that  our  disclosure 
controls  and  procedures  or  internal  controls  over  financial  reporting  will  prevent  all  errors  and  all  fraud.  A  control  system,  no 
matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the system 
are met and cannot detect all deviations. Because of the inherent limitations in all control systems, no evaluation of controls can 
provide  absolute  assurance  that  all  control  issues  and  instances  of  fraud  or  deviations,  if  any,  within  the  company  have  been 
detected.  Projections  of  any  evaluation  of  effectiveness  to  future  periods  are  subject  to  the  risks  that  controls  may  become 
inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Item 9B. Other Information

As  disclosed  in  the  table  below,  during  the  three  months  ended  December  31,  2023,  certain  of  our  directors  and/or  executive 
officers  adopted  plans  for  trading  arrangements  intended  to  satisfy  the  affirmative  defense  conditions  of  Rule  10b5-1(c)  of  the 
Exchange Act.

Name
Robert E. Landry

Position

Executive Vice President, 
Finance and Chief Financial 
Officer

Date of Plan 
Adoption

Scheduled End 
Date of Trading 
Arrangement(a)

Total Number of  
Securities to Be Sold 
Under the Plan

11/9/2023

5/6/2024  

14,337 

(a) The trading arrangement may expire on an earlier date if and when all transactions under the arrangement are completed.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

Item 10. Directors, Executive Officers and Corporate Governance

PART III

The information required by this item (other than the information set forth in the next paragraph in this Item 10) will be included 
in  our  definitive  proxy  statement  with  respect  to  our  2024  Annual  Meeting  of  Shareholders  to  be  filed  with  the  SEC,  and  is 
incorporated herein by reference.

We have adopted a code of business conduct and ethics that applies to our officers, directors, and employees. The full text of our 
code of business conduct and ethics can be found on our website (http://www.regeneron.com) under the "Governance" heading on 
the "Investors & Media" page. We may satisfy the disclosure requirements under Item 5.05 of Form 8-K regarding an amendment 
to,  or  a  waiver  from,  a  provision  of  our  code  of  business  conduct  and  ethics  that  applies  to  our  principal  executive  officer, 
principal  financial  officer,  principal  accounting  officer,  or  controller,  or  persons  performing  similar  functions,  by  posting  such 
information on our website where it is accessible through the same link noted above.  

Item 11. Executive Compensation

The  information  called  for  by  this  item  will  be  included  in  our  definitive  proxy  statement  with  respect  to  our  2024  Annual 
Meeting of Shareholders to be filed with the SEC, and is incorporated herein by reference. 

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The  information  called  for  by  this  item  will  be  included  in  our  definitive  proxy  statement  with  respect  to  our  2024  Annual 
Meeting of Shareholders to be filed with the SEC, and is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The  information  called  for  by  this  item  will  be  included  in  our  definitive  proxy  statement  with  respect  to  our  2024  Annual 
Meeting of Shareholders to be filed with the SEC, and is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services

The  information  called  for  by  this  item  will  be  included  in  our  definitive  proxy  statement  with  respect  to  our  2024  Annual 
Meeting of Shareholders to be filed with the SEC, and is incorporated herein by reference. 

91

Item 15. Exhibits and Financial Statement Schedules

(a)

1.  Financial Statements

PART IV

The consolidated financial statements filed as part of this report are listed on the Index to Financial Statements on page 
F-1.

2.  Financial Statement Schedules

All schedules for which provision is made in the applicable accounting regulations of the SEC are not required under the 
related instructions or are inapplicable and, therefore, have been omitted. 

3.  Exhibits

Exhibit 
Number Description
3.1

3.2

3.2.1

4.1

4.2

4.3

4.4
4.5
10.1 +

10.1.1 +

10.1.2 +

10.1.3 +

10.2 +

10.2.1 +

10.2.2 +

10.2.3 +

10.2.4 +

Restated Certificate of Incorporation, as amended. (Incorporated by reference from the Form 10-Q for Regeneron 
Pharmaceuticals, Inc. (the "Registrant"), for the quarter ended June 30, 2015, filed August 4, 2015.)
Amended  and  Restated  By-Laws.  (Incorporated  by  reference  from  the  Form  8-K  for  the  Registrant  filed 
December 21, 2016.)
Amendment to the Amended and Restated By-Laws effective June 9, 2023. (Incorporated by reference from the 
Form 8-K for the Registrant filed June 14, 2023.)
Description  of  Securities  Registered  Pursuant  to  Section  12  of  the  Securities  Exchange  Act  of  1934. 
(Incorporated by reference from the Form 10-K for the Registrant, for the year ended December 31, 2019, filed 
February 7, 2020.)
Indenture, dated August 12, 2020, between the Registrant and U.S. Bank National Association. (Incorporated by 
reference from the Form 8-K for the Registrant, filed August 12, 2020.)
First  Supplemental  Indenture,  dated  August  12,  2020,  between  the  Registrant  and  U.S.  Bank  National 
Association. (Incorporated by reference from the Form 8-K for the Registrant, filed August 12, 2020.)
Form of 1.750% Senior Note due 2030 (included in Exhibit 4.3). 
Form of 2.800% Senior Note due 2050 (included in Exhibit 4.3). 
Regeneron Pharmaceuticals, Inc. Second Amended and Restated 2000 Long-Term Incentive Plan. (Incorporated 
by reference from the Registration Statement on Form S-8 for the Registrant, filed June 13, 2011.)
Form of option agreement and related notice of grant for use in connection with the grant of time based vesting 
stock  options  to  the  Registrant's  non-employee  directors  and  executive  officers  under  the  Regeneron 
Pharmaceuticals,  Inc.  Second  Amended  and  Restated  2000  Long-Term  Incentive  Plan.  (Incorporated  by 
reference from the Form 10-Q for the Registrant, for the quarter ended March 31, 2009, filed April 30, 2009.)
Form of option agreement and related notice of grant for use in connection with the grant of time based vesting 
stock  options  to  the  Registrant's  non-employee  directors  under  the  Regeneron  Pharmaceuticals,  Inc.  Second 
Amended and Restated 2000 Long-Term Incentive Plan (revised). (Incorporated by reference from the Form 10-
K for the Registrant, for the year ended December 31, 2011, filed February 21, 2012.)
Amendment  No.  1  to  the  Regeneron  Pharmaceuticals,  Inc.  Second  Amended  and  Restated  2000  Long-Term 
Incentive Plan. (Incorporated by reference from the Form 10-K for the Registrant, for the year ended December 
31, 2013, filed February 13, 2014.) 
Amended  and  Restated  Regeneron  Pharmaceuticals,  Inc.  2014  Long-Term  Incentive  Plan.  (Incorporated  by 
reference from the Registration Statement on Form S-8 for the Registrant, filed June 12, 2017.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock options to the Registrant's executive officers under the Regeneron Pharmaceuticals, Inc. 2014 Long-Term 
Incentive Plan. (Incorporated by reference from the Form 8-K for the Registrant, filed June 18, 2014.)
Form  of  restricted  stock  award  agreement  and  related  notice  of  grant  for  use  in  connection  with  the  grant  of 
restricted  stock  awards  to  the  Registrant's  executive  officers  under  the  Regeneron  Pharmaceuticals,  Inc.  2014 
Long-Term  Incentive  Plan.  (Incorporated  by  reference  from  the  Form  8-K  for  the  Registrant,  filed  June  18, 
2014.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock options to the Registrant's non-employee directors under the Regeneron Pharmaceuticals, Inc. 2014 Long-
Term Incentive Plan. (Incorporated by reference from the Form 8-K for the Registrant, filed June 18, 2014.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock options to the Registrant's executive officers under the Regeneron Pharmaceuticals, Inc. 2014 Long-Term 
Incentive Plan (revised). (Incorporated by reference from the Form 8-K for the Registrant, filed November 19, 
2015.)

92

10.2.5 +

10.2.6 +

10.2.7 +

10.2.8 +

10.2.9 +

10.2.10 +

10.2.11 +

10.2.12 +

10.2.13 +

10.2.14 +

10.2.15 +

10.2.16 +

10.2.17 +

10.3 +

10.3.1 +

10.3.2 +

Form  of  restricted  stock  award  agreement  and  related  notice  of  grant  for  use  in  connection  with  the  grant  of 
restricted  stock  awards  to  the  Registrant's  executive  officers  under  the  Regeneron  Pharmaceuticals,  Inc.  2014 
Long-Term  Incentive  Plan  (revised).  (Incorporated  by  reference  from  the  Form  8-K  for  the  Registrant,  filed 
November 19, 2015.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock options to the Registrant's non-employee directors under the Regeneron Pharmaceuticals, Inc. 2014 Long-
Term Incentive Plan (revised). (Incorporated by reference from the Form 10-K for the Registrant, for the year 
ended December 31, 2015, filed February 11, 2016.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock options to the Registrant's executive officers under the Amended and Restated Regeneron Pharmaceuticals, 
Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-K for the Registrant, for the 
year ended December 31, 2017, filed February 8, 2018.)
Form  of  restricted  stock  award  agreement  and  related  notice  of  grant  for  use  in  connection  with  the  grant  of 
restricted  stock  awards  to  the  Registrant's  executive  officers  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-K for the 
Registrant, for the year ended December 31, 2017, filed February 8, 2018.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock  options  to  the  Registrant's  non-employee  directors  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-K for the 
Registrant, for the year ended December 31, 2017, filed February 8, 2018.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock options to the Registrant's executive officers under the Amended and Restated Regeneron Pharmaceuticals, 
Inc.  2014  Long-Term  Incentive  Plan  (revised  2018).  (Incorporated  by  reference  from  the  Form  10-K  for  the 
Registrant, for the year ended December 31, 2018, filed February 7, 2019.) 

Form  of  restricted  stock  award  agreement  and  related  notice  of  grant  for  use  in  connection  with  the  grant  of 
restricted  stock  awards  to  the  Registrant's  executive  officers  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (revised 2018). (Incorporated by reference from the Form 
10-K for the Registrant, for the year ended December 31, 2018, filed February 7, 2019.) 
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock  options  to  the  Registrant's  non-employee  directors  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (revised 2018). (Incorporated by reference from the Form 
10-K for the Registrant, for the year ended December 31, 2018, filed February 7, 2019.) 
Form of restricted stock unit award agreement and related notice of grant for use in connection with the grant of 
restricted  stock  units  to  the  Registrant's  non-employee  directors  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-K for the 
Registrant, for the year ended December 31, 2018, filed February 7, 2019.) 
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock options to the Registrant's executive officers under the Amended and Restated Regeneron Pharmaceuticals, 
Inc.  2014  Long-Term  Incentive  Plan  (revised  2019).  (Incorporated  by  reference  from  the  Form  10-K  for  the 
Registrant, for the year ended December 31, 2019, filed February 7, 2020.)
Form  of  restricted  stock  award  agreement  and  related  notice  of  grant  for  use  in  connection  with  the  grant  of 
restricted  stock  awards  to  the  Registrant's  executive  officers  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (revised 2019). (Incorporated by reference from the Form 
10-K for the Registrant, for the year ended December 31, 2019, filed February 7, 2020.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock  options  to  the  Registrant's  non-employee  directors  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (revised 2019). (Incorporated by reference from the Form 
10-K for the Registrant, for the year ended December 31, 2019, filed February 7, 2020.)
Form of restricted stock unit award agreement and related notice of grant for use in connection with the grant of 
restricted  stock  units  to  the  Registrant's  non-employee  directors  under  the  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (revised 2019). (Incorporated by reference from the Form 
10-K for the Registrant, for the year ended December 31, 2019, filed February 7, 2020.)
Second Amended and Restated Regeneron Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated 
by reference from the Registration Statement on Form S-8 for the Registrant, filed June 16, 2020.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock  options  to  the  Registrant's  executive  officers  under  the  Second  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-K for the 
Registrant, for the year ended December 31, 2020, filed February 8, 2021.)
Form  of  restricted  stock  award  agreement  and  related  notice  of  grant  for  use  in  connection  with  the  grant  of 
restricted stock awards to the Registrant's executive officers under the Second Amended and Restated Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-K for the 
Registrant, for the year ended December 31, 2020, filed February 8, 2021.)

93

10.3.3 +

10.3.4 +

10.3.5 +

10.3.6 +

10.3.7 +

10.4 +

Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock  options  to  the  Registrant's  non-employee  directors  under  the  Second  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-K for the 
Registrant, for the year ended December 31, 2020, filed February 8, 2021.)
Form of restricted stock unit award agreement and related notice of grant for use in connection with the grant of 
restricted  stock  units  to  the  Registrant's  non-employee  directors  under  the  Second  Amended  and  Restated 
Regeneron Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan. (Incorporated by reference from the Form 10-
K for the Registrant, for the year ended December 31, 2020, filed February 8, 2021.)
Form of performance restricted stock unit award agreement and related notice of grant for use in connection with 
the grant of performance restricted stock units to Leonard S. Schleifer, M.D., Ph.D. and George D. Yancopoulos, 
M.D.,  Ph.D.  under  the  Second  Amended  and  Restated  Regeneron  Pharmaceuticals,  Inc.  2014  Long-Term 
Incentive Plan. (Incorporated by reference from the Form 10-K for the Registrant, for the year ended December 
31, 2020, filed February 8, 2021.)
Form of stock option agreement and related notice of grant for use in connection with the grant of non-qualified 
stock  options  to  the  Registrant's  executive  officers  under  the  Second  Amended  and  Restated  Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (revised 2023).
Form  of  restricted  stock  award  agreement  and  related  notice  of  grant  for  use  in  connection  with  the  grant  of 
restricted stock awards to the Registrant's executive officers under the Second Amended and Restated Regeneron 
Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (revised 2023).
Amended  and  Restated  Employment  Agreement,  dated  as  of  November  14,  2008,  between  the  Registrant  and 
Leonard S. Schleifer, M.D., Ph.D. (Incorporated by reference from the Form 10-K for the Registrant, for the year 
ended December 31, 2008, filed February 26, 2009.)

10.8*

10.9*

10.6 +

10.7 +

10.5 +

10.7.1 +

10.4.1 + Waiver and Consent, dated as of April 14, 2023, pursuant to the Amended and Restated Employment Agreement, 
dated as of November 14, 2008, between the Registrant and Leonard S. Schleifer, M.D., Ph.D. (Incorporated by 
reference from the Form 10-Q for the Registrant, for the quarter ended June 30, 2023, filed August 3, 2023.)
Offer Letter for Robert E. Landry effective September 9, 2013. (Incorporated by reference from the Form 8-K for 
the Registrant, filed September 12, 2013.)
Regeneron  Pharmaceuticals,  Inc.  Change  in  Control  Severance  Plan,  amended  and  restated  effective  as  of 
November  14,  2008.  (Incorporated  by  reference  from  the  Form  10-K  for  the  Registrant,  for  the  year  ended 
December 31, 2008, filed February 26, 2009.)
Regeneron Pharmaceuticals, Inc. Cash Incentive Bonus Plan. (Incorporated by reference from the Form 8-K for 
the Registrant, filed June 17, 2015.)
First  Amendment  to  Cash  Incentive  Bonus  Plan.  (Incorporated  by  reference  from  the  Form  10-Q  for  the 
Registrant, for the quarter ended March 31, 2023, filed May 4, 2023.)
IL-1  Antibody  Termination  Agreement  by  and  between  Novartis  Pharma  AG,  Novartis  Pharmaceuticals 
Corporation and the Registrant, dated as of June 8, 2009. (Incorporated by reference from the Form 10-Q for the 
Registrant, for the quarter ended June 30, 2009, filed August 4, 2009.)
License and Collaboration Agreement, dated as of October 18, 2006, by and between Bayer HealthCare LLC and 
the  Registrant.  (Incorporated  by  reference  from  the  Form  10-Q  for  the  Registrant,  for  the  quarter  ended 
September 30, 2006, filed November 6, 2006.)
Restated Amendment Agreement, dated December 30, 2014 and entered into effective as of May 7, 2012, by and 
between  Bayer  HealthCare  LLC  and  the  Registrant.  (Incorporated  by  reference  from  the  Form  10-K  for  the 
Registrant, for the year ended December 31, 2014, filed February 12, 2015.)
Second  Amendment  Agreement,  dated  December  19,  2019,  by  and  between  Bayer  HealthCare  LLC  and  the 
Registrant. (Incorporated by reference from the Form 10-K for the Registrant, for the year ended December 31, 
2019, filed February 7, 2020.)
Amended and Restated License and Collaboration Agreement, dated as of November 10, 2009, by and among 
Aventis Pharmaceuticals Inc., sanofi-aventis Amerique du Nord, and the Registrant. (Incorporated by reference 
from the Form 10-K/A for the Registrant, for the year ended December 31, 2009, filed June 2, 2010.)
10.10.1** First Amendment to Amended and Restated License and Collaboration Agreement by and between the Registrant 
and  Aventis  Pharmaceuticals  Inc.,  dated  May  1,  2013.  (Incorporated  by  reference  from  the  Form  10-Q  for  the 
Registrant, for the quarter ended June 30, 2023, filed August 3, 2023.)
Amendment  No.  2  to  Amended  and  Restated  License  and  Collaboration  Agreement,  dated  July  27,  2015  and 
entered  into  effective  as  of  July  1,  2015,  by  and  between  the  Registrant  and  Sanofi  Biotechnology  SAS,  as 
successor-in-interest  to  Aventis  Pharmaceuticals,  Inc.  (Incorporated  by  reference  from  the  Form  10-Q  for  the 
Registrant, for the quarter ended September 30, 2015, filed November 4, 2015.)

10.10.2*

10.9.2**

10.9.1*

10.10*

10.10.3** Third Amendment to Amended and Restated License and Collaboration Agreement, dated as of April 5, 2020, 
and  effective  as  of  April  1,  2020,  by  and  between  the  Registrant,  Sanofi  Biotechnology  SAS,  and  Sanofi. 
(Incorporated  by  reference  from  the  Form  10-Q  for  the  Registrant,  for  the  quarter  ended  June  30,  2020,  filed 
August 5, 2020.)

94

10.10.4** Fourth  Amendment  to  Amended  and  Restated  License  and  Collaboration  Agreement,  dated  as  of  October  6, 
2021, by and between the Registrant, Sanofi Biotechnology SAS, and Sanofi. (Incorporated by reference from 
the Form 10-K for the Registrant, for the year ended December 31, 2021, filed February 7, 2022.)

10.11**

10.10.5** Fifth Amendment to Amended and Restated License and Collaboration Agreement, dated as of June 1, 2022, by 
and between the Registrant, Sanofi Biotechnology SAS, and Sanofi. (Incorporated by reference from the Form 
10-Q for the Registrant, for the quarter ended June 30, 2022, filed August 3, 2022.)
Praluent Cross License & Commercialization Agreement, dated as of April 5, 2020, and effective as of April 1, 
2020, by and between the Registrant and Sanofi Biotechnology SAS. (Incorporated by reference from the Form 
10-Q for the Registrant, for the quarter ended June 30, 2020, filed August 5, 2020.)
Amended and Restated Investor Agreement, dated as of January 11, 2014, by and among Sanofi, sanofi-aventis 
US LLC, Aventis Pharmaceuticals Inc., sanofi-aventis Amerique du Nord, and the Registrant. (Incorporated by 
reference from the Form 8-K for the Registrant, filed January 13, 2014.)
Amendment  to  the  Amended  and  Restated  Investor  Agreement,  dated  as  of  May  25,  2020,  by  and  among  the 
Registrant, Sanofi, Sanofi-Aventis US LLC, and Aventisub LLC. (Incorporated by reference from the Form 8-K 
for the Registrant, filed May 29, 2020.)

10.12.1

10.12

10.15*

10.14**

10.13*** Credit Agreement, dated as of December 19, 2022, by and among the Registrant, as a borrower and guarantor, 
certain  direct  subsidiaries  of  the  Registrant,  as  the  initial  subsidiary  borrowers,  the  lenders  and  issuing  banks 
party thereto, and JPMorgan Chase Bank, N.A., as administrative agent, swingline lender, and an issuing bank. 
(Incorporated by reference from the Form 8-K for the Registrant, filed December 20, 2022.)
Amended and Restated Immuno-oncology License and Collaboration Agreement, dated as of June 1, 2022, by 
and between the Registrant and Sanofi Biotechnology SAS. (Incorporated by reference from the Form 10-Q for 
the Registrant, for the quarter ended June 30, 2022, filed August 3, 2022.)
Purchase  Agreement,  dated  as  of  December  30,  2016,  by  and  among  BMR-Landmark  at  Eastview  LLC  and 
BMR-Landmark at Eastview IV LLC and the Registrant. (Incorporated by reference from the Form 10-K for the 
Registrant, for the year ended December 31, 2016, filed February 9, 2017.)
Third Amended and Restated Participation Agreement, dated as of March 27, 2023, by and among Old Saw Mill 
Holdings LLC, as lessee, Bank of America, N.A., as administrative agent, BA Leasing BSC, LLC, as lessor, and 
the  rent  assignees  party  thereto  from  time  to  time.  (Incorporated  by  reference  from  the  Form  8-K  for  the 
Registrant, filed March 29, 2023.)
Third Amended and Restated Lease and Remedies Agreement, dated as of March 27, 2023, between Old Saw 
Mill Holdings LLC, as lessee, and BA Leasing BSC, LLC, as lessor. (Incorporated by reference from the Form 
8-K for the Registrant, filed March 29, 2023.)
Third  Amended  and  Restated  Guaranty,  dated  as  of  March  27,  2023,  made  by  the  Registrant,  Regeneron 
Healthcare Solutions, Inc., and Regeneron Genetics Center LLC, as guarantors. (Incorporated by reference from 
the Form 8-K for the Registrant, filed March 29, 2023.)

10.16***

10.18***

10.17***

10.19** Master Agreement, dated as of April 8, 2019, by and between the Registrant and Alnylam Pharmaceuticals, Inc. 
(Incorporated  by  reference  from  the  Form  10-Q  for  the  Registrant,  for  the  quarter  ended  June  30,  2019,  filed 
August 6, 2019.)

21.1
23.1
24.1
31.1

10.19.1** Form of Co-Co Collaboration Agreement (Exhibit B to Master Agreement contained in Exhibit 10.19).
10.19.2** Form of License Agreement (Exhibit C to Master Agreement contained in Exhibit 10.19).
10.19.3** Amendment No. 1 to Master Agreement, dated as of April 10, 2023, by and between the Registrant and Alnylam 
Pharmaceuticals, Inc. (Incorporated by reference from the Form 10-Q for the Registrant, for the quarter ended 
June 30, 2023, filed August 3, 2023.)
Subsidiaries of the Registrant.
Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.
Power of Attorney (included on the signature page of this Annual Report on Form 10-K).
Certification  of  Principal  Executive  Officer  pursuant  to  Rule  13a-14(a)  under  the  Securities  Exchange  Act  of 
1934.
Certification  of  Principal  Financial  Officer  pursuant  to  Rule  13a-14(a)  under  the  Securities  Exchange  Act  of 
1934.
Certification of Principal Executive Officer and Principal Financial Officer pursuant to 18 U.S.C. Section 1350.
Clawback Policy.
Interactive Data Files pursuant to Rule 405 of Regulation S-T formatted in Inline Extensible Business Reporting 
Language ("Inline XBRL"): (i) the Registrant's Consolidated Balance Sheets as of December 31, 2023 and 2022; 
(ii)  the  Registrant's  Consolidated  Statements  of  Operations  and  Comprehensive  Income  for  the  years  ended 
December 31, 2023, 2022, and 2021; (iii) the Registrant's Consolidated Statements of Stockholders’ Equity for 
the  years  ended  December  31,  2023,  2022,  and  2021;  (iv)  the  Registrant's  Consolidated  Statements  of  Cash 
Flows for the years ended December 31, 2023, 2022, and 2021; and (v) the notes to the Registrant's Consolidated 
Financial Statements.

32
97.1
101

31.2

104

Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

95

_______

* Portions of this document have been omitted and filed separately with the SEC pursuant to requests for 

confidential treatment pursuant to Rule 24b-2.

** Certain  confidential  portions  of  this  Exhibit  were  omitted  in  accordance  with  Item  601(b)(10)  of 
Regulation S-K. The Registrant agrees to furnish supplementally a copy of all confidential portions of 
this Exhibit that were omitted to the SEC upon its request.

*** Certain  of  the  exhibits  and/or  schedules  to  this  Exhibit  have  been  omitted  in  accordance  with  Item 
601(a)(5)  of  Regulation  S-K.  The  Registrant  agrees  to  furnish  supplementally  a  copy  of  all  omitted 
exhibits and schedules of this Exhibit to the SEC upon its request.
+ Indicates a management contract or compensatory plan or arrangement.

Item 16. Form 10-K Summary

None.

96

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this 
report to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

REGENERON PHARMACEUTICALS, INC.

Date:

February 5, 2024

By: 

/s/ LEONARD S. SCHLEIFER

Leonard S. Schleifer, M.D., Ph.D.

President and Chief Executive Officer

97

POWER OF ATTORNEY 

KNOW  ALL  PERSONS  BY  THESE  PRESENTS,  that  each  person  whose  signature  appears  below  constitutes  and  appoints 
Leonard S. Schleifer and Christopher Fenimore, and each of them, his or her true and lawful attorney-in-fact and agent, with the 
full  power  of  substitution  and  resubstitution,  for  him  or  her  and  in  his  or  her  name,  place,  and  stead,  in  any  and  all  capacities 
therewith, to sign any and all amendments to this Annual Report on Form 10-K, and to file the same, with all exhibits thereto, and 
other documents in connection therewith, with the Securities and Exchange Commission, granting unto each said attorney-in-fact 
and agent full power and authority to do and perform each and every act and thing requisite and necessary to be done, as fully to 
all intents and purposes as such person might or could do in person, hereby ratifying and confirming all that each said attorney-in-
fact and agent, or either of them, or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons 
on behalf of the registrant and in the capacities and on the dates indicated:

Signature

Title

Date

/s/   LEONARD S. SCHLEIFER

Leonard S. Schleifer, M.D., Ph.D.

/s/   ROBERT E. LANDRY

Robert E. Landry

/s/   CHRISTOPHER FENIMORE

Christopher Fenimore

/s/   GEORGE D. YANCOPOULOS

George D. Yancopoulos, M.D., Ph.D.

Board Co-Chair, President and Chief 
Executive Officer (Principal Executive 
Officer)

February 5, 2024

Executive Vice President, Finance and 
Chief Financial Officer (Principal 
Financial Officer)

February 5, 2024

Senior Vice President, Controller 
(Principal Accounting Officer)

February 5, 2024

Board Co-Chair, President and Chief 
Scientific Officer

/s/   BONNIE L. BASSLER

Director

Bonnie L. Bassler, Ph.D.

/s/   MICHAEL S. BROWN

Director

Michael S. Brown, M.D.

/s/   N. ANTHONY COLES

Director

N. Anthony Coles, M.D.

/s/   JOSEPH L. GOLDSTEIN

Director

Joseph L. Goldstein, M.D.
/s/   KATHRYN GUARINI
Kathryn Guarini, Ph.D.

/s/   CHRISTINE A. POON

Christine A. Poon

/s/   ARTHUR F. RYAN

Arthur F. Ryan

Director

Director

Director

/s/   DAVID P. SCHENKEIN

Director

David P. Schenkein, M.D.

/s/   GEORGE L. SING

George L. Sing

Director

/s/   CRAIG B. THOMPSON

Director

Craig B. Thompson, M.D. 

/s/   HUDA Y. ZOGHBI

Huda Y. Zoghbi, M.D. 

Director

98

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

February 5, 2024

REGENERON PHARMACEUTICALS, INC.
INDEX TO FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm (PCAOB ID 238)

Consolidated Balance Sheets as of December 31, 2023 and 2022

Consolidated Statements of Operations and Comprehensive Income for the Years Ended 
December 31, 2023, 2022, and 2021
Consolidated Statements of Stockholders' Equity for the Years Ended December 31, 2023, 2022, 
and 2021
Consolidated Statements of Cash Flows for the Years Ended December 31, 2023, 2022, and 
2021
Notes to Consolidated Financial Statements

Page Numbers

F-2

F-4

F-5

F-6

F-8

F-9 to F-46

F-1

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of Regeneron Pharmaceuticals, Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We  have  audited  the  accompanying  consolidated  balance  sheets  of  Regeneron  Pharmaceuticals,  Inc.  and  its  subsidiaries  (the 
"Company")  as  of  December  31,  2023  and  2022,  and  the  related  consolidated  statements  of  operations  and  comprehensive 
income, of stockholders' equity and of cash flows for each of the three years in the period ended December 31, 2023, including 
the related notes (collectively referred to as the "consolidated financial statements"). We also have audited the Company's internal 
control  over  financial  reporting  as  of  December  31,  2023,  based  on  criteria  established  in  Internal  Control  -  Integrated 
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position 
of the Company as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years 
in  the  period  ended  December  31,  2023  in  conformity  with  accounting  principles  generally  accepted  in  the  United  States  of 
America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting 
as of December 31, 2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Company's management is responsible for these consolidated financial statements, for maintaining effective internal control 
over  financial  reporting,  and  for  its  assessment  of  the  effectiveness  of  internal  control  over  financial  reporting,  included  in 
Management's  Report  on  Internal  Control  over  Financial  Reporting  appearing  under  Item  9A.  Our  responsibility  is  to  express 
opinions on the Company's consolidated financial statements and on the Company's internal control over financial reporting based 
on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) 
(PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and 
the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the 
audits  to  obtain  reasonable  assurance  about  whether  the  consolidated  financial  statements  are  free  of  material  misstatement, 
whether  due  to  error  or  fraud,  and  whether  effective  internal  control  over  financial  reporting  was  maintained  in  all  material 
respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of 
the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such 
procedures  included  examining,  on  a  test  basis,  evidence  regarding  the  amounts  and  disclosures  in  the  consolidated  financial 
statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as 
well  as  evaluating  the  overall  presentation  of  the  consolidated  financial  statements.  Our  audit  of  internal  control  over  financial 
reporting  included  obtaining  an  understanding  of  internal  control  over  financial  reporting,  assessing  the  risk  that  a  material 
weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. 
Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our 
audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A  company's  internal  control  over  financial  reporting  is  a  process  designed  to  provide  reasonable  assurance  regarding  the 
reliability  of  financial  reporting  and  the  preparation  of  financial  statements  for  external  purposes  in  accordance  with  generally 
accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that 
(i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of 
the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of 
financial  statements  in  accordance  with  generally  accepted  accounting  principles,  and  that  receipts  and  expenditures  of  the 
company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide 
reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's 
assets that could have a material effect on the financial statements.

F-2

Because  of  its  inherent  limitations,  internal  control  over  financial  reporting  may  not  prevent  or  detect  misstatements.  Also, 
projections  of  any  evaluation  of  effectiveness  to  future  periods  are  subject  to  the  risk  that  controls  may  become  inadequate 
because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matters

The  critical  audit  matter  communicated  below  is  a  matter  arising  from  the  current  period  audit  of  the  consolidated  financial 
statements  that  was  communicated  or  required  to  be  communicated  to  the  audit  committee  and  that  (i)  relates  to  accounts  or 
disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or 
complex  judgments.  The  communication  of  critical  audit  matters  does  not  alter  in  any  way  our  opinion  on  the  consolidated 
financial  statements,  taken  as  a  whole,  and  we  are  not,  by  communicating  the  critical  audit  matter  below,  providing  a  separate 
opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Reserve for an Uncertain Tax Position

As described in Notes 1 and 15 to the consolidated financial statements, the Company's reserves for uncertain tax positions were 
$696.4  million  as  of  December  31,  2023.  A  reserve  for  an  individual  uncertain  tax  position  represents  a  portion  of  the 
consolidated balance. The Company recognizes the financial statement effects of a tax position when management's assessment is 
that there is more than a 50% probability that the position will be sustained upon examination by a taxing authority based upon its 
technical merits. Uncertain tax positions are recorded based upon certain recognition and measurement criteria. Management re-
evaluates uncertain tax positions and considers various factors, including, but not limited to, changes in tax law, the measurement 
of tax positions taken or expected to be taken in tax returns, and changes in facts or circumstances related to a tax position. The 
Company adjusts the amount of the liability to reflect any subsequent changes in the relevant facts and circumstances surrounding 
the uncertain tax positions. 

The principal considerations for our determination that performing procedures relating to the reserve for an uncertain tax position 
is  a  critical  audit  matter  are  (i)  the  significant  judgment  by  management  when  determining  the  reserve  for  the  uncertain  tax 
position;  (ii)  a  high  degree  of  auditor  judgment,  subjectivity  and  effort  in  performing  procedures  and  evaluating  management's 
determination  of  the  reserve  for  the  uncertain  tax  position;  (iii)  the  assessment  and  evaluation  of  audit  evidence  available  to 
support  the  reserve  for  the  uncertain  tax  position  is  complex,  and  (iv)  the  audit  effort  involved  the  use  of  professionals  with 
specialized skill and knowledge. 

Addressing  the  matter  involved  performing  procedures  and  evaluating  audit  evidence  in  connection  with  forming  our  overall 
opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to the 
recognition of reserves for uncertain tax positions. These procedures also included, among others, (i) testing the information used 
in the calculation of the reserve for the individual uncertain tax position, such as international and federal filing positions, and the 
related final tax returns; (ii) testing the calculation of the reserve for the uncertain tax position; and (iii) evaluating management's 
assessment of the technical merits of tax positions and estimates of the amount of tax benefit expected to be sustained, as well as 
the likelihood of the possible outcome. Professionals with specialized skills and knowledge were used to assist in evaluating the 
technical merits and the tax benefit expected to be sustained and the application of relevant tax laws.

/s/ PricewaterhouseCoopers LLP

Florham Park, New Jersey
February 5, 2024 

We have served as the Company’s auditor since 1989. 

F-3

REGENERON PHARMACEUTICALS, INC.
CONSOLIDATED BALANCE SHEETS
(In millions, except per share data)

ASSETS

December 31,

2023

2022

Current assets:

Cash and cash equivalents
Marketable securities
Accounts receivable, net
Inventories
Prepaid expenses and other current assets

Total current assets

Marketable securities
Property, plant, and equipment, net
Intangible assets, net
Deferred tax assets
Other noncurrent assets

Total assets

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:

Accounts payable
Accrued expenses and other current liabilities
Deferred revenue
Total current liabilities

Long-term debt
Finance lease liabilities
Deferred revenue
Other noncurrent liabilities

Total liabilities

Commitments and contingencies

Stockholders' equity:

$ 

$ 

$ 

2,730.0  $ 
8,114.8 
5,667.3 
2,580.5 
386.6 
19,479.2 

5,396.5 
4,146.4 
1,038.6 
2,575.4 
444.1 
33,080.2  $ 

606.6  $ 

2,357.9 
458.9 
3,423.4 

1,982.9 
720.0 
126.7 
854.1 
7,107.1 

3,105.9 
4,636.4 
5,328.7 
2,401.9 
411.2 
15,884.1 

6,591.8 
3,763.0 
915.5 
1,723.7 
336.4 
29,214.5 

589.2 
2,074.2 
477.9 
3,141.3 

1,981.4 
720.0 
69.8 
638.0 
6,550.5 

Preferred Stock, par value $.01 per share; 30.0 shares authorized; shares issued and 

outstanding - none

Class A Stock, convertible, par value $.001 per share; 40.0 shares authorized; shares 

issued and outstanding - 1.8 in 2023 and 2022

Common Stock, par value $.001 per share; 320.0 shares authorized; shares issued - 

133.1 in 2023 and 130.4 in 2022

Additional paid-in capital
Retained earnings
Accumulated other comprehensive loss

Treasury Stock, at cost; 25.5 shares in 2023 and 22.6 shares in 2022
Total stockholders' equity
Total liabilities and stockholders' equity

— 

— 

— 

— 

0.1 
11,354.0 
27,260.3 

(80.9)   
(12,560.4)   
25,973.1 
33,080.2  $ 

0.1 
9,949.3 
23,306.7 
(238.8) 
(10,353.3) 
22,664.0 
29,214.5 

$ 

The accompanying notes are an integral part of the financial statements.

F-4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REGENERON PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
(In millions, except per share data)

Statements of Operations
Revenues:

Net product sales
Collaboration revenue
Other revenue

Expenses:

Research and development
Acquired in-process research and development
Selling, general, and administrative
Cost of goods sold
Cost of collaboration and contract manufacturing
Other operating (income) expense, net

Income from operations

Other income (expense):

Other income (expense), net
Interest expense

Year Ended December 31,
2022

2021

2023

$ 

7,078.0  $ 
5,503.1 
536.1 
13,117.2 

6,893.7  $ 
4,914.1 
365.1 
12,172.9 

12,117.2 
3,673.3 
281.2 
16,071.7 

4,439.0 
186.1 
2,631.3 
932.1 
883.7 

(2.1)   

9,070.1 

3,592.5 
255.1 
2,115.9 
800.0 
760.4 
(89.9)   

7,434.0 

2,860.1 
48.0 
1,824.9 
1,773.1 
664.4 
(45.6) 
7,124.9 

4,047.1 

4,738.9 

8,946.8 

225.2 
(73.0)   
152.2 

179.3 
(59.4)   
119.9 

436.3 
(57.3) 
379.0 

Income before income taxes

4,199.3 

4,858.8 

9,325.8 

Income tax expense

Net income

Net income per share - basic
Net income per share - diluted

Weighted average shares outstanding - basic
Weighted average shares outstanding - diluted

Statements of Comprehensive Income
Net income
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on debt securities
Loss on foreign currency translation
Unrealized gain on cash flow hedges

Comprehensive income

$ 

$ 
$ 

245.7 

520.4 

1,250.5 

3,953.6  $ 

4,338.4  $ 

8,075.3 

37.05  $ 
34.77  $ 

40.51  $ 
38.22  $ 

106.7 
113.7 

107.1 
113.5 

76.40 
71.97 

105.7 
112.2 

$ 

3,953.6  $ 

4,338.4  $ 

8,075.3 

158.2 

(0.3)   
— 
4,111.5  $ 

(213.6)   
— 
1.0 
4,125.8  $ 

(56.4) 
— 
0.9 
8,019.8 

$ 

The accompanying notes are an integral part of the financial statements.

F-5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance, December 31, 2020
Issuance of Common Stock for equity awards 
granted under long-term incentive plans
Common Stock tendered upon exercise of 

stock options and vesting of restricted stock 
for employee tax obligations

Issuance/distribution of Common Stock for 

401(k) Savings Plan

Repurchases of Common Stock
Stock-based compensation charges
Net income
Other comprehensive loss, net of tax

Balance, December 31, 2021
Issuance of Common Stock for equity awards 
granted under long-term incentive plans
Common Stock tendered upon exercise of 

stock options and vesting of restricted stock 
for employee tax obligations

Issuance/distribution of Common Stock for 

401(k) Savings Plan

Repurchases of Common Stock
Stock-based compensation charges
Net income
Other comprehensive loss, net of tax

Balance, December 31, 2022

  — 

  — 

  — 
  — 
  — 
  — 
  — 

1.8 

  — 

  — 

  — 
  — 
  — 
  — 
  — 

1.8 

— 

— 

— 
— 
— 
— 
— 

— 

— 

— 

— 
— 
— 
— 
— 

— 

REGENERON PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
(In millions)

Class A Stock

Common Stock

Shares Amount

Shares

Amount

Additional 
Paid-in 
Capital

Retained 
Earnings

Accumulated 
Other 
Comprehensive 
Income (Loss)

Treasury Stock

Shares

Amount

Total 
Stockholders' 
Equity

1.8  $  — 

121.5  $ 

0.1  $ 

6,716.2  $  10,893.0  $ 

29.3 

(16.4)  $  (6,613.3)  $ 

11,025.3 

6.2 

— 

1,676.0 

— 

— 

— 
— 
— 
8,075.3 
— 

— 

  — 

— 

1,676.0 

— 

  — 

0.1 
(3.1)   

— 
— 
— 
— 

  — 
  — 
(55.5)    — 

— 

7.4 

(1,655.0)   

— 
— 
— 

(944.6) 

48.1 
(1,655.0) 
599.2 
8,075.3 
(55.5) 

(944.6)   

40.7 
— 
599.2 
— 
— 

8,087.5 

18,968.3 

(26.2)   

(19.4)   

(8,260.9)   

18,768.8 

1,517.4 

(445.7)   

52.3 
— 
737.8 
— 
— 

— 

— 

— 
— 
— 
4,338.4 
— 

— 

  — 

— 

1,517.4 

— 

  — 

0.1 
(3.3)   

— 
— 
— 
— 

  — 
  — 
(212.6)    — 

— 

7.4 

(2,099.8)   

— 
— 
— 

(445.7) 

59.7 
(2,099.8) 
737.8 
4,338.4 
(212.6) 

(1.5)   

— 
— 
— 
— 
— 

126.2 

4.8 

(0.6)   

— 
— 
— 
— 
— 

— 

— 
— 
— 
— 
— 

0.1 

— 

— 

— 
— 
— 
— 
— 

130.4 

0.1 

9,949.3 

23,306.7 

(238.8)   

(22.6)    (10,353.3)   

22,664.0 

F-6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (continued)

Class A Stock
Shares Amount

Common Stock

Shares

Amount

Additional 
Paid-in 
Capital

Retained 
Earnings

Accumulated 
Other 
Comprehensive 
Income (Loss)

Treasury Stock

Shares

Amount

Total 
Stockholders' 
Equity

— 

  — 

— 

1,152.2 

— 

  — 

0.1 
(3.0)   

  — 
  — 
  — 

— 
— 
— 
— 
157.9 
(80.9)   

— 

7.5 

(2,214.6)   

— 
— 
— 

(25.5)  $ (12,560.4)  $ 

(708.4) 

74.1 
(2,214.6) 
894.3 
3,953.6 
157.9 
25,973.1 

Issuance of Common Stock for equity awards 
granted under long-term incentive plans
Common Stock tendered upon exercise of 

stock options and vesting of restricted stock 
for employee tax obligations

Issuance/distribution of Common Stock for 

401(k) Savings Plan

Repurchases of Common Stock
Stock-based compensation charges
Net income
Other comprehensive income, net of tax
Balance, December 31, 2023

  — 

— 

3.5 

— 

1,152.2 

  — 

— 

(0.8)   

— 

(708.4)   

— 

— 

  — 
  — 
  — 
  — 
  — 

— 
— 
— 
— 
— 
1.8  $  — 

— 
— 
— 
— 
— 
133.1  $ 

— 
— 
— 
— 
— 
0.1  $  11,354.0  $  27,260.3  $ 

— 
— 
— 
3,953.6 
— 

66.6 
— 
894.3 
— 
— 

The accompanying notes are an integral part of the financial statements.

F-7

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REGENERON PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(In millions)

Cash flows from operating activities:

Net income
Adjustments to reconcile net income to net cash provided by operating 

activities:
Depreciation and amortization
Stock-based compensation expense
Losses (gains) on marketable and other securities, net
Other non-cash items, net
Deferred income taxes
Acquired in-process research and development in connection with 

asset acquisition

Changes in assets and liabilities:

(Increase) decrease in accounts receivable
Increase in inventories
Increase in prepaid expenses and other assets
Increase (decrease) in deferred revenue
Increase (decrease) in accounts payable, accrued expenses, and 

other liabilities

Total adjustments

Net cash provided by operating activities

Cash flows from investing activities:

Purchases of marketable and other securities
Sales or maturities of marketable and other securities
Capital expenditures
Payments for Libtayo intangible asset
Acquisitions, net of cash acquired
Net cash used in investing activities

Year Ended December 31,
2022

2021

2023

$ 

3,953.6  $ 

4,338.4  $ 

8,075.3 

421.0 
885.0 
266.4 

(0.1)   
(837.8)   

341.4 
725.0 
36.8 
368.0 
(746.4)   

286.2 
601.7 
(387.0) 
568.7 
(147.1) 

— 

195.0 

— 

(338.8)   
(271.7)   
(120.1)   
37.9 

598.6 
640.4 
4,594.0 

707.8 
(696.5)   
(148.6)   
32.4 

(138.4)   
676.5 
5,014.9 

(11,646.0)   
9,442.2 
(718.6)   
(207.8)   
(54.9)   
(3,185.1)   

(7,487.9)   
5,550.5 
(590.1)   
(1,026.8)   
(230.3)   
(3,784.6)   

(1,927.4) 
(494.3) 
(240.7) 
(120.2) 

866.1 
(994.0) 
7,081.3 

(7,048.1) 
2,215.3 
(551.9) 
— 
— 
(5,384.7) 

Cash flows from financing activities:

Proceeds from issuance of Common Stock
Payments in connection with Common Stock tendered for employee tax 

obligations

Repurchases of Common Stock
Net cash used in financing activities

1,145.5 

1,519.5 

1,672.3 

(700.6)   
(2,235.0)   
(1,790.1)   

(445.7)   
(2,082.8)   
(1,009.0)   

(1,032.7) 
(1,645.4) 
(1,005.8) 

Effect of exchange rate changes on cash, cash equivalents, and restricted cash  

(0.4)   

— 

— 

Net (decrease) increase in cash, cash equivalents, and restricted cash

(381.6)   

221.3 

690.8 

Cash, cash equivalents, and restricted cash at beginning of period

3,119.4 

2,898.1 

2,207.3 

Cash, cash equivalents, and restricted cash at end of period

$ 

2,737.8  $ 

3,119.4  $ 

2,898.1 

Supplemental disclosure of cash flow information
Cash paid for interest (net of amounts capitalized)
Cash paid for income taxes

$ 
$ 

73.1  $ 
870.3  $ 

53.7  $ 
1,502.4  $ 

55.8 
1,218.4 

The accompanying notes are an integral part of the financial statements.

F-8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REGENERON PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
1. Business Overview and Summary of Significant Accounting Policies

Organization and Business

Regeneron  Pharmaceuticals,  Inc.  and  its  subsidiaries  ("Regeneron,"  "Company,"  "we,"  "us,"  and  "our")  is  a  fully  integrated 
biotechnology  company  that  invents,  develops,  manufactures,  and  commercializes  medicines  for  people  with  serious  diseases. 
The  Company's  products  and  product  candidates  in  development  are  designed  to  help  patients  with  eye  diseases,  allergic  and 
inflammatory  diseases,  cancer,  cardiovascular  and  metabolic  diseases,  hematologic  conditions,  infectious  diseases,  and  rare 
diseases. The Company's research and development efforts have led to eleven products that have received marketing approval by 
the  U.S.  Food  and  Drug  Administration  ("FDA").  In  addition,  REGEN-COV®  was  authorized  under  an  Emergency  Use 
Authorization  ("EUA")  from  November  2020  until  January  2022  when  the  EUA  was  revised  to  exclude  its  use  in  geographic 
regions where infection or exposure is likely due to a variant that is not susceptible to the treatment; as a result, REGEN-COV is 
not currently authorized for use in any U.S. states, territories, or jurisdictions. The Company is a party to collaboration agreements 
to develop and commercialize, as applicable, certain products and product candidates (see Note 3).

The  Company  operates  in  one  business  segment,  which  includes  all  activities  related  to  the  discovery,  development,  and 
commercialization of medicines for serious diseases. The Company's business is subject to certain risks including, but not limited 
to, uncertainties relating to conducting research activities, product development, obtaining regulatory approvals, competition, and 
obtaining and enforcing patents.

Basis of Presentation 

The  consolidated  financial  statements  include  the  accounts  of  Regeneron  and  its  wholly-owned  subsidiaries.  Intercompany 
balances and transactions are eliminated in consolidation.

Certain reclassifications have been made to prior period amounts to conform with the current period's presentation.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make 
estimates  and  assumptions  that  affect  the  amounts  reported  in  the  financial  statements  and  accompanying  notes.  Actual  results 
could differ from those estimates.

Concentration of Credit Risk

Financial  instruments  which  potentially  expose  the  Company  to  concentrations  of  credit  risk  consist  of  cash,  cash  equivalents, 
certain  investments,  and  accounts  receivable.  In  accordance  with  the  Company's  policies,  the  Company  mandates  asset 
diversification and monitors exposure with its counterparties.  

Concentrations  of  credit  risk  with  respect  to  collaborator  (see  Note  3)  and  customer  accounts  receivable  are  significant.  As  of 
December  31,  2023  and  2022,  two  individual  customers  accounted  for  83%  and  86%  of  the  Company's  net  trade  accounts 
receivable balances, respectively. The Company has contractual payment terms with each of its collaborators and customers, and 
the Company monitors their financial performance and credit worthiness so that it can properly assess and respond to any changes 
in their credit profile. As of December 31, 2023 and 2022, there were no write-offs and allowances of accounts receivable related 
to credit risk for the Company's collaborators or customers.

Significant Accounting Policies

Cash and Cash Equivalents

The  Company  considers  all  highly  liquid  debt  instruments  with  a  maturity  of  three  months  or  less  when  purchased  to  be  cash 
equivalents. The carrying amount reported in the Consolidated Balance Sheet for cash and cash equivalents approximates its fair 
value.

Debt and Equity Securities

The  Company  has  an  investment  policy  that  includes  guidelines  on  acceptable  investment  securities,  minimum  credit  quality, 
maturity parameters, and diversification. The Company invests its cash primarily in debt securities. The Company considers its 
investments in debt securities to be "available-for-sale," as defined by authoritative guidance issued by the Financial Accounting 
Standards Board ("FASB"). These assets are carried at fair value and the unrealized gains and losses are included in accumulated 
other comprehensive income (loss). Realized gains and losses on available-for-sale debt securities are included in other income 

F-9

(expense),  net.  The  Company  reviews  its  portfolio  of  available-for-sale  debt  securities,  using  both  quantitative  and  qualitative 
factors, to determine if declines in fair value below cost have resulted from a credit-related loss or other factors. If the decline in 
fair  value  is  due  to  credit-related  factors,  a  loss  is  recognized  in  net  income,  whereas  if  the  decline  in  fair  value  is  not  due  to 
credit-related factors, the loss is recorded in other comprehensive income (loss). 

The Company also has investments in equity securities that are carried at fair value with changes in fair value recognized within 
other  income  (expense),  net.  The  Company  has  elected  to  measure  certain  equity  investments  it  holds  that  do  not  have  readily 
determinable  fair  values  at  cost  less  impairment,  if  any,  and  adjusts  for  observable  price  changes  in  orderly  transactions  for 
identical or similar investments of the same issuer within other income (expense), net. 

Accounts Receivable

The Company's trade accounts receivable arise from product sales and represent amounts due from its customers. In addition, the 
Company  records  accounts  receivable  arising  from  its  collaboration  and  licensing  agreements.  The  Company  monitors  the 
financial  performance  and  credit  worthiness  of  its  counterparties  so  that  it  can  properly  assess  and  respond  to  changes  in  their 
credit  profile.  The  Company  provides  allowances  against  receivables  for  estimated  losses,  if  any,  that  may  result  from  a 
counterparty's inability to pay. Amounts determined to be uncollectible are written-off against the allowance. 

Inventories

Inventories are stated at the lower of cost or net realizable value. The Company determines the cost of inventory using the first-in, 
first-out, or FIFO, method. 

The  Company  capitalizes  inventory  costs  associated  with  the  Company's  products  prior  to  regulatory  approval  when,  based  on 
management's  judgment,  future  commercialization  is  considered  probable  and  the  future  economic  benefit  is  expected  to  be 
realized; otherwise, such costs are expensed. The determination to capitalize inventory costs is based on various factors, including 
status and expectations of the regulatory approval process, any known safety or efficacy concerns, potential labeling restrictions, 
and any other impediments to obtaining regulatory approval. 

The Company periodically analyzes its inventory levels to identify inventory that may expire prior to expected sale or has a cost 
basis  in  excess  of  its  estimated  realizable  value,  and  writes  down  such  inventories  as  appropriate.  In  addition,  the  Company's 
products are subject to strict quality control and monitoring which the Company performs throughout the manufacturing process. 
If certain batches or units of product no longer meet quality specifications or become obsolete due to expiration, the Company 
records a charge to write down such inventory to its estimated realizable value.

Property, Plant, and Equipment

Property,  plant,  and  equipment  are  stated  at  cost,  net  of  accumulated  depreciation.  Depreciation  is  calculated  on  a  straight-line 
basis over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of the estimated useful 
lives of the assets or the remaining lease term. Costs of construction of certain long-lived assets include capitalized interest, which 
is amortized over the estimated useful life of the related asset. Expenditures for maintenance and repairs which do not materially 
extend the useful lives of the assets are charged to expense as incurred. The cost and accumulated depreciation or amortization of 
assets retired or sold are removed from the respective accounts, and any gain or loss is recognized within income from operations. 
The estimated useful lives of property, plant, and equipment are as follows:

Building and improvements

10–50 years

Laboratory and other equipment

3–10 years

Furniture and fixtures

5 years

The Company periodically assesses the recoverability of long-lived assets, such as property, plant, and equipment, and evaluates 
such assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be 
recoverable. 

F-10

Leases

The Company determines if an arrangement is a lease considering whether there is an identified asset and the contract conveys the 
right to control its use. Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company may 
include options to extend or terminate a lease within the lease term when it is reasonably certain that it will exercise that option. 
The Company accounts for lease components (e.g., rental payments) separately from non-lease components (e.g., common area 
maintenance costs).

Lease  liabilities  are  recognized  at  the  lease  commencement  date  based  on  the  present  value  of  the  remaining  lease  payments, 
discounted using the rate implicit in the lease. For leases where an implicit rate is not readily determinable, the Company uses its 
incremental  borrowing  rate  based  on  information  available  at  the  lease  commencement  date  to  determine  the  present  value  of 
future lease payments. Lease expense for operating leases is recognized on a straight-line basis over the expected lease term.

Acquisitions

The  Company  makes  a  determination  whether  a  transaction  should  be  accounted  for  as  a  business  combination  or  as  an  asset 
acquisition.  In  a  business  combination,  the  acquisition  method  of  accounting  generally  requires  that  the  assets  acquired  and 
liabilities assumed be recorded as of the date of the acquisition at their respective fair values. Amounts allocated to acquired in-
process  research  and  development  are  capitalized  as  indefinite-lived  intangible  assets.  Any  excess  of  the  purchase  price 
(consideration  transferred)  over  the  fair  values  of  net  assets  acquired  is  recorded  as  goodwill.  In  a  business  combination, 
contingent consideration obligations are recorded at fair value as of the acquisition date and remeasured each subsequent reporting 
period until the contingencies have been resolved, with any changes in fair value recorded in Other operating (income) expense, 
net.

If it is determined that the assets acquired do not meet the definition of a business, or if substantially all of the fair value of the 
assets acquired are concentrated in a single identifiable asset, then the transaction is accounted for as an asset acquisition rather 
than a business combination. In an asset acquisition, assets acquired are recorded at cost, goodwill is not recognized, and acquired 
in-process research and development with no alternative future use is charged to expense.

Intangible Assets

Intangible assets acquired in a business combination are recorded at fair value, while intangible assets acquired in connection with 
an asset acquisition are recorded at cost. 

Payments to acquire intangible assets in an asset acquisition may include up-front payments and contingent consideration. With 
regard  to  contingent  consideration  in  an  asset  acquisition,  the  Company  recognizes  regulatory  milestones  upon  achievement, 
royalties in the period in which the underlying sales occur, and sales-based milestones when the milestone is deemed probable by 
the  Company  of  being  achieved.  If  contingent  consideration  is  recognized  subsequent  to  the  acquisition  date  in  an  asset 
acquisition, the amount of such consideration is recorded as an addition to the cost basis of the intangible asset with a cumulative 
catch-up adjustment for amortization expense as if the additional amount of consideration had been accrued from the outset of the 
acquisition.

Indefinite-lived intangible assets are subject to impairment testing until completion or abandonment of the associated research and 
development  efforts.  Definite-lived  intangible  assets  are  amortized  to  Cost  of  goods  sold  over  the  estimated  useful  lives  of  the 
assets based on the pattern in which the economic benefits of the intangible assets are consumed; if that pattern cannot be reliably 
determined, a straight-line basis is used. 

Intangible assets are reviewed for recoverability whenever events or changes in circumstances indicate that the carrying amount of 
the asset may not be recoverable. If an indicator of impairment exists, the Company compares the projected undiscounted cash 
flows  to  be  generated  by  the  asset  to  the  intangible  asset's  carrying  amount.  If  the  projected  undiscounted  cash  flows  of  the 
intangible asset are less than the carrying amount, the intangible asset is written down to its fair value in the period in which the 
impairment occurs.

Product Revenue

Revenue from product sales is recognized at a point in time when the Company's customer is deemed to have obtained control of 
the product, which generally occurs upon receipt or acceptance by its customer. 

The amount of revenue the Company recognizes from product sales may vary due to rebates, chargebacks, and discounts provided 
under  governmental  and  other  programs,  distribution-related  fees,  and  other  sales-related  deductions.  In  order  to  determine  the 
transaction price, the Company estimates, utilizing the expected value method, the amount of variable consideration to which the 
Company will be entitled. This estimate is based upon contracts with customers, healthcare providers, payors, and government 
agencies,  statutorily-defined  discounts  applicable  to  government-funded  programs,  historical  experience,  estimated  payor  mix, 

F-11

and  other  relevant  factors.  The  Company  reviews  its  estimates  of  rebates,  chargebacks,  and  other  applicable  provisions  each 
period and records any necessary adjustments in the current period's net product sales.  

•

•

•

•

Rebates: The Company's rebates include amounts paid to managed care organizations, group purchasing organizations, 
state Medicaid programs, and other rebate programs. The Company estimates reductions to product sales for each type of 
rebate and records an allowance for rebates in the same period in which the related product sales are recognized. The 
Company's liability for rebates consists of estimates for claims related to the current and prior periods that have not been 
paid and estimates for claims that will be made related to product that exists in the distribution channel at the end of the 
period.
Chargebacks  and  Discounts:  The  Company's  reserves  related  to  discounted  pricing  to  eligible  physicians,  Veterans' 
Administration ("VA"), Public Health Services, and others (collectively "qualified healthcare providers") represent the 
Company's  estimated  obligations  resulting  from  contractual  commitments  to  sell  products  to  qualified  healthcare 
providers  at  prices  lower  than  the  list  prices  the  Company  charges  to  its  customers  (i.e.,  distributors  and  specialty 
pharmacies). The Company's customers charge the Company for the difference between what they pay for the products 
and the discounted selling price to the qualified healthcare providers. The Company estimates reductions to product sales 
for each type of chargeback and records an allowance for chargebacks in the same period that the related product sales 
are recognized. The Company's reserve for chargebacks consists of amounts for which it expects to issue credit based on 
expected sales by its customers to qualified healthcare providers and chargebacks that customers have claimed but for 
which the Company has not yet issued credit.
Distribution-Related  Fees:  The  Company  has  written  contracts  with  its  customers  that  include  terms  for  distribution-
related fees. The Company estimates and records distribution and related fees due to its customers generally based on 
gross sales.  
Other Sales-Related Deductions: The Company's other sales-related deductions include co-pay assistance programs and 
product  returns.  The  Company  estimates  and  records  other  sales-related  deductions  generally  based  on  gross  sales, 
written contracts, and other relevant factors.

Consistent with industry practice, the Company generally offers its customers a limited right to return product purchased directly 
from the Company, which is principally based upon the product's expiration date. Product returned is generally not resalable given 
the nature of the Company's products and method of administration. The Company develops estimates for product returns based 
upon historical experience, shelf life of the product, and other relevant factors. The Company monitors product supply levels in 
the distribution channel, as well as sales by its customers, using product-specific data provided by its customers. If necessary, the 
Company's  estimates  of  product  returns  may  be  adjusted  in  the  future  based  on  actual  returns  experience,  known  or  expected 
changes in the marketplace, or other factors.  

Collaborative Arrangements

The Company has entered into various collaborative arrangements to research, develop, manufacture, and commercialize products 
and/or product candidates. Although each of these arrangements is unique in nature, such arrangements involve a joint operating 
activity where both parties are active participants in the activities of the collaboration and exposed to significant risks and rewards 
dependent on the commercial success of the activities. 

F-12

In arrangements where the Company does not deem its collaborator to be its customer, payments to and from its collaborator are 
presented in the Company's statement of operations based on the nature of our business operations, the nature of the arrangement, 
including  the  contractual  terms,  and  the  nature  of  the  payments.  In  general,  the  presentation  of  such  amounts  is  summarized 
below. 

Nature/Type of Payment

Statement of Operations Presentation

Regeneron's share of profits or losses in connection with 

Collaboration revenue

commercialization of products 

Reimbursement for manufacturing of commercial supplies

Collaboration revenue

Royalties and/or sales-based milestones earned

Collaboration revenue

Reimbursement of Regeneron's research and development 

Reduction to Research and development expenses

expenses 

Regeneron's obligation for its share of collaborator's research 

Research and development expense

and development expenses

Up-front/opt-in and development milestone payments to 

Acquired in-process research and development expense

collaborators

Reimbursement of Regeneron's commercialization-related 

Reduction to Selling, general, and administrative expense

expenses

Regeneron's obligation for its share of collaborator's 

commercialization-related expenses

Regeneron's obligation to pay collaborator for its share of 

gross profits when Regeneron is deemed to be the principal
Up-front and development milestones earned (when there is a 
combined unit of account which includes a license and 
providing research and development services)

Selling, general, and administrative expense

Cost of goods sold

Other operating income

In  agreements  involving  multiple  goods  or  services  promised  to  be  transferred  to  the  Company's  collaborator,  the  Company 
assesses,  at  the  inception  of  the  contract,  whether  each  promise  represents  a  separate  obligation  (i.e.,  is  "distinct"),  or  whether 
such promises should be combined as a single unit of account. When the Company has a combined unit of account which includes 
a license and providing research and development services to its collaborator, recognition of up-front payments and development 
milestones earned from its collaborator is deferred (as a liability) and recognized over the development period (i.e., over time) 
typically  using  an  input  method  on  the  basis  of  the  Company's  research  and  development  costs  incurred  relative  to  the  total 
expected  cost  which  determines  the  extent  of  the  Company's  progress  toward  completion.  The  Company  reviews  its  estimates 
each period and makes revisions to such estimates as necessary. 

When the Company is entitled to reimbursement of all or a portion of the expenses (e.g., research and development expenses) that 
it incurs under a collaboration, it records those reimbursable amounts in the period in which such costs are incurred. 

If  the  Company's  collaborator  performs  research  and  development  work  or  commercialization-related  activities  and  the  parties 
share the related costs, the Company also recognizes, as expense (e.g., research and development expense or selling, general, and 
administrative expense, as applicable) in the period when its collaborator incurs such expenses, the portion of the collaborator's 
expenses  that  the  Company  is  obligated  to  reimburse.  The  Company's  collaborators  provide  the  Company  with  estimated 
expenses for the most recent fiscal quarter. The estimates are revised, if necessary, in subsequent periods if actual expenses differ 
from those estimates.

Under  certain  of  the  Company's  collaboration  agreements,  product  sales  and  cost  of  sales  may  be  recorded  by  the  Company's 
collaborators as they are deemed to be the principal in the transaction. In arrangements where the Company:

•

•

•

supplies  commercial  product  to  its  collaborator,  the  Company  may  be  reimbursed  for  its  manufacturing  costs  as 
commercial product is shipped to the collaborator (however, recognition of such cost reimbursements may be deferred 
until the product is sold by the Company's collaborator to third-party customers); 
shares in any profits or losses arising from the commercialization of such products, the Company records its share of the 
variable  consideration,  representing  net  product  sales  less  cost  of  goods  sold  and  shared  commercialization  and  other 
expenses, in the period in which such underlying sales occur and costs are incurred by the collaborator; 
receives royalties and/or sales-based milestone payments from its collaborator, the Company recognizes such amounts in 
the period earned.

The  Company's  collaborators  provide  it  with  estimates  of  product  sales  and  the  Company's  share  of  profits  or  losses,  as 
applicable, for each quarter. The estimates are revised, if necessary, in subsequent periods if the Company's actual share of profits 
or losses differ from those estimates.  

F-13

Research and Development Expenses

Research and development expenses include costs attributable to the conduct of research and development programs, including 
the cost of salaries, payroll taxes, employee benefits, materials, supplies, depreciation on and maintenance of research equipment, 
costs related to research collaboration and licensing agreements, clinical trial expenses, the cost of services provided by outside 
contractors,  including  services  related  to  the  Company's  clinical  trials,  the  cost  of  manufacturing  drug  for  use  in  research  and 
development, amounts that the Company is obligated to reimburse to collaborators for research and development expenses that 
they incur, and the allocable portions of facility costs. Costs associated with research and development are expensed.  

For each clinical trial that the Company conducts, certain clinical trial costs are expensed immediately, while others are expensed 
over time based on the expected total number of patients in the trial, the rate at which patients enter and remain in the trial, and/or 
the period over which clinical investigators, contract research organizations ("CROs"), or other third-party service providers are 
expected to provide services. In the event of early termination of a clinical trial, the Company accrues and recognizes expenses in 
an amount based on its estimate of the remaining noncancelable obligations associated with the winding-down of the clinical trial, 
including any applicable penalties.  

Stock-based Compensation  

The  Company  recognizes  stock-based  compensation  expense  for  equity  grants  under  the  Company's  long-term  incentive  plans 
(including  stock  options,  restricted  stock  awards,  and  restricted  stock  units  (both  time-based  and  performance-based))  to 
employees and non-employee members of the Company's board of directors (as applicable) based on the grant-date fair value of 
those awards. The grant-date fair value of an award is generally recognized as compensation expense over the award's requisite 
service period. Stock-based compensation expense also includes an estimate, which is made at the time of grant, of the number of 
awards that are expected to be forfeited. This estimate is revised, if necessary, in subsequent periods if actual forfeitures differ 
from  those  estimates.  In  addition,  the  Company  reassesses  its  forfeiture  rate  assumptions  at  least  annually,  considering  both 
historical forfeiture experience and an estimate of future forfeitures for currently outstanding unvested awards. 

The  Company  uses  the  Black-Scholes  model  to  compute  the  estimated  fair  value  of  stock  option  awards.  Additionally,  the 
Company uses a Monte Carlo simulation to compute the estimated fair value of performance-based restricted stock units that are 
subject to vesting based on the Company’s attainment of pre-established criteria that include a market condition. 

For  performance-based  restricted  stock  units  that  contain  a  performance  condition,  the  Company  recognizes  stock-based 
compensation expense if and when the Company determines that it is probable the performance condition will be achieved (based 
on  the  number  of  shares  expected  to  be  vested  and  issued).  The  Company  reassesses  the  probability  of  achievement  at  each 
reporting period and adjusts compensation cost, as necessary. If there are any changes in the Company's probability assessment, 
the  Company  recognizes  a  cumulative  catch-up  adjustment  in  the  period  of  the  change  in  estimate,  with  the  remaining 
unrecognized  expense  recognized  prospectively  over  the  remaining  requisite  service  period.  If  the  Company  subsequently 
determines  that  the  performance  criteria  are  not  met  or  are  not  expected  to  be  met,  any  amounts  previously  recognized  as 
compensation expense are reversed in the period when such determination is made.

Income Taxes

The  provision  for  income  taxes  includes  U.S.  federal,  state,  local,  and  foreign  taxes.  Income  taxes  are  accounted  for  under  the 
liability method. Deferred tax assets and liabilities are recognized for the expected future tax consequences of events that have 
been included in the financial statements or tax returns, including deferred tax assets and liabilities for expected amounts of global 
intangible low-taxed income ("GILTI") inclusions. Deferred tax assets and liabilities are determined as the difference between the 
tax basis of assets and liabilities and their respective financial reporting amounts ("temporary differences") at enacted tax rates in 
effect for the years in which the differences are expected to reverse. A valuation allowance is established for deferred tax assets 
for which it is more likely than not that some portion or all of the deferred tax assets will not be realized.  

The  Company  recognizes  the  financial  statement  effects  of  a  tax  position  when  management's  assessment  is  that  there  is  more 
than a 50% probability that the position will be sustained upon examination by a taxing authority based upon its technical merits. 
Uncertain  tax  positions  are  recorded  based  upon  certain  recognition  and  measurement  criteria.  The  Company  re-evaluates 
uncertain tax positions and considers various factors, including, but not limited to, changes in tax law, the measurement of tax 
positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, information obtained 
during in-process audit activities, and changes in facts or circumstances related to a tax position. The Company adjusts the amount 
of the liability to reflect any subsequent changes in the relevant facts and circumstances surrounding the uncertain tax positions. 
The Company recognizes interest and penalties related to income tax matters in income tax expense.

F-14

Per Share Data

Basic net income per share is computed by dividing net income by the weighted average number of shares of Common Stock and 
Class  A  Stock  outstanding.  Net  income  per  share  is  presented  on  a  combined  basis,  inclusive  of  Common  Stock  and  Class  A 
Stock  outstanding,  as  each  class  of  stock  has  equivalent  economic  rights.  Basic  net  income  per  share  excludes  restricted  stock 
until vested. Diluted net income per share includes the potential dilutive effect of common stock equivalents as if such securities 
were converted or exercised during the period, when the effect is dilutive. Common stock equivalents include outstanding stock 
options and unvested restricted stock under the Company's long-term incentive plans, which are included under the treasury stock 
method when dilutive.

Recently Issued Accounting Standards

In  November  2023,  the  FASB  issued  Accounting  Standards  Update  No.  2023-07,  Segment  Reporting  -  Improvements  to 
Reportable  Segment  Disclosures.  The  amendments  require  disclosure  of  incremental  segment  information  on  an  annual  and 
interim basis. The amendments also require companies with a single reportable segment to provide all disclosures required by this 
amendment and all existing segment disclosures in Accounting Standards Codification 280, Segment Reporting. The amendments 
are  effective  for  fiscal  years  beginning  after  December  15,  2023,  and  interim  periods  beginning  after  December  15,  2024.  The 
Company does not expect the adoption of the amendments to have a significant impact on its financial statements.

In December 2023, the FASB issued Accounting Standards Update No. 2023-09, Income Taxes - Improvements to Income Tax 
Disclosures. The amendments require (i) enhanced disclosures in connection with an entity's effective tax rate reconciliation and 
(ii) income taxes paid disaggregated by jurisdiction. The amendments are effective for annual periods beginning after December 
15, 2024. The Company does not expect the adoption of the amendments to have a significant impact on its financial statements.

2. Product Sales 

Net product sales consist of the following:

(In millions)
EYLEA® HD
EYLEA®

U.S.

U.S.

Total EYLEA HD and EYLEA U.S.

Libtayo®(a) 
Libtayo(a) 

Total Libtayo

Praluent®
REGEN-COV®(c)
Evkeeza® 
Inmazeb® 
ARCALYST®(d) 

U.S.
ROW(b)
Global

U.S.

U.S.
U.S.

U.S.
U.S.

Year Ended December 31,
2022

2021

2023

$ 

165.8  $ 

—  $ 

— 

5,719.6 

5,885.4 

6,264.6 

6,264.6 

538.8 

324.3 

863.1 

182.4 

— 
77.3 

69.8 
— 

374.5 

73.0 

447.5 

130.0 

— 
48.6 

3.0 
— 

5,792.3 

5,792.3 

306.3 

— 

306.3 

170.0 

5,828.0 
18.4 

— 
2.2 

$ 

7,078.0  $ 

6,893.7  $ 

12,117.2 

(a) Prior to July 1, 2022, Regeneron recorded net product sales of Libtayo in the United States 
and Sanofi recorded net product sales of Libtayo outside the United States. Effective July 1, 
2022, the Company records global net product sales of Libtayo. See Note 3 for further details.
(b) Rest of world ("ROW")
(c) Net product sales of REGEN-COV in the United States relate to product sold in connection 
with the Company's agreements with the U.S. government. See Note 3 for further details.
(d) Effective April 1, 2021, Kiniksa records net product sales of ARCALYST in the United States. 
Previously, the Company recorded net product sales of ARCALYST in the United States.

As  of  December  31,  2023  and  2022,  the  Company  had  $3.888  billion  and  $3.586  billion,  respectively,  of  trade  accounts 
receivable that were recorded within Accounts receivable, net.

F-15

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company had product sales to certain customers that accounted for more than 10% of total gross product revenue for each of 
the  years  ended  December  31,  2023,  2022,  and  2021.  Sales  to  each  of  these  customers  as  a  percentage  of  the  Company's  total 
gross product revenue are as follows:

Besse Medical, a subsidiary of Cencora, Inc.

McKesson Corporation

U.S. government

Year Ended December 31,

2023

2022

2021

 51 %

 25 %

*

 55 %

 28 %

*

 30 %

 18 %

 43 %

* Sales to the U.S. government represented less than 10% of total gross product revenue during the period.

Revenue from product sales is recorded net of applicable provisions for rebates, chargebacks, and discounts, distribution-related 
fees,  and  other  sales-related  deductions.  Accruals  for  chargebacks  and  discounts  are  recorded  as  a  direct  reduction  to  accounts 
receivable.  Accruals  for  rebates,  distribution-related  fees,  and  other  sales-related  deductions  are  recorded  within  accrued 
liabilities. The following table summarizes the provisions, and credits/payments, for sales-related deductions.

(In millions)

Rebates, 
Chargebacks,
and Discounts

Distribution-
Related Fees

Other Sales-
Related 
Deductions

Balance as of December 31, 2020

$ 

202.2  $ 

77.2  $ 

44.8  $ 

1,047.1 

(1,034.7)   

214.6 

1,537.3 

363.6 

(360.8)   

80.0 

431.1 

Total

324.2 

1,561.1 

150.4 

(127.6)   

(1,523.1) 

67.6 

141.1 

362.2 

2,109.5 

(1,398.0)   

(399.7)   

(127.2)   

(1,924.9) 

353.9 

2,074.5 

(1,972.7)   

111.4 

439.2 

(388.3)   

162.3  $ 

81.5 

155.3 

546.8 

2,669.0 

(157.5)   

(2,518.5) 

79.3  $ 

697.3 

Provisions

Credits/payments

Balance as of December 31, 2021

Provisions

Credits/payments

Balance as of December 31, 2022

Provisions

Credits/payments

Balance as of December 31, 2023

$ 

455.7  $ 

F-16

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3. Collaboration, License, and Other Agreements

a. Sanofi 

Amounts  recognized  in  the  Company's  Statements  of  Operations  in  connection  with  its  collaborations  with  Sanofi  are  detailed 
below: 

(In millions)
Antibody:

Statement of Operations 
Classification

Regeneron's share of profits in connection 
with commercialization of antibodies

Collaboration revenue

Sales-based milestones earned
Reimbursement for manufacturing of 

Collaboration revenue
Collaboration revenue

commercial supplies

Other
Regeneron's obligation for its share of 

Sanofi R&D expenses, net of 
reimbursement of R&D expenses
Reimbursement of commercialization-

related expenses 

Collaboration revenue
(R&D expense)/Reduction of 

R&D expense

Reduction of SG&A expense

Immuno-oncology(a):

Regeneron's share of profits (losses) in 

Collaboration revenue

connection with commercialization of 
Libtayo outside the United States

Reimbursement for manufacturing of ex-

Collaboration revenue

U.S. commercial supplies

Reimbursement of R&D expenses
Reimbursement of commercialization-

Reduction of R&D expense
Reduction of SG&A expense

related expenses

Regeneron's obligation for its share of 

SG&A expense

Sanofi commercial expenses

Regeneron's obligation for Sanofi's share 

Cost of goods sold

of Libtayo U.S. gross profits

Amounts recognized in connection with 

Other operating income

up-front payments received

$ 
$ 

$ 
$ 

$ 

$ 

$ 

$ 
$ 

$ 

$ 

$ 

$ 

Year Ended December 31,
2022

2021

2023

3,136.5  $  2,082.0 * $ 
$ 

50.0  $ 

100.0 

613.0  $ 
—  $ 

633.7 
28.7 

(83.7)  $ 

43.0 

534.4  $ 

437.4 

—  $ 

6.7 

—  $ 
—  $ 

4.6 
42.7 

—  $ 

41.4 

$ 
$ 

$ 

$ 

$ 

$ 
$ 

$ 

1,363.0 
50.0 

488.8 
— 

129.2 

320.5 

(13.6) 

14.0 
85.1 

89.6 

—  $ 

(19.9)  $ 

(36.3) 

—  $ 

(70.1)  $ 

(133.0) 

—  $ 

35.1 

$ 

6.1 

* Net of one-time payment of $56.9 million to Sanofi in connection with the amendment to the Antibody License and Collaboration 
Agreement
(a) As described within the "Immuno-Oncology" section below, effective July 1, 2022, the Company obtained the exclusive right to 
develop, commercialize, and manufacture Libtayo worldwide.

Antibody

The  Company  is  party  to  a  global,  strategic  collaboration  with  Sanofi  to  research,  develop,  and  commercialize  fully  human 
monoclonal antibodies (the "Antibody Collaboration"), which currently consists of Dupixent® (dupilumab), Kevzara® (sarilumab), 
and itepekimab. 

Under the terms of the Antibody License and Collaboration Agreement (the "LCA"), Sanofi is generally responsible for funding 
80% to 100% of agreed-upon development costs. The Company is obligated to reimburse Sanofi for 30% to 50% of worldwide 
development expenses that were funded by Sanofi based on the Company's share of collaboration profits from commercialization 
of collaboration products. Under the terms of the LCA, the Company was required to apply 10% of its share of the profits from 
the  Antibody  Collaboration  in  any  calendar  quarter  to  reimburse  Sanofi  for  these  development  costs.  On  July  1,  2022,  an 
amendment to the LCA became effective, pursuant to which the percentage of the Company's share of profits used to reimburse 
Sanofi  for  such  development  costs  increased  from  10%  to  20%.  A  portion  of  the  value  associated  with  the  increase  in 
reimbursement  percentage  was  deemed  to  be  contingent  consideration  attributable  to  the  Company's  acquisition  of  the  Libtayo 
(cemiplimab) rights described within the "Immuno-Oncology" section below; this portion is recorded as an increase to the Libtayo 
intangible asset over time as the Company repays such development costs to Sanofi. The Company's contingent reimbursement 
obligation to Sanofi under the Antibody Collaboration was approximately $2.330 billion as of December 31, 2023.

F-17

Sanofi  leads  commercialization  activities  for  products  under  the  Antibody  Collaboration,  subject  to  the  Company's  right  to  co-
commercialize such products. The Company co-commercializes Dupixent in the United States and in certain countries outside the 
United States. The parties equally share profits from sales within the United States. The parties share profits outside the United 
States on a sliding scale based on sales starting at 65% (Sanofi)/35% (Regeneron) and ending at 55% (Sanofi)/45% (Regeneron). 

In addition to profit sharing, the Company was entitled to receive sales milestone payments from Sanofi. In 2023, the Company 
earned the final $50.0 million sales-based milestone from Sanofi, upon aggregate annual sales of antibodies outside the United 
States (including Praluent, which was previously included in the LCA) exceeding $3.0 billion on a rolling twelve-month basis. In 
2022,  the  Company  earned  two  $50.0  million  sales-based  milestones  from  Sanofi,  upon  aggregate  annual  sales  of  antibodies 
outside  the  United  States  (including  Praluent)  exceeding  $2.0  billion  and  $2.5  billion,  respectively,  on  a  rolling  twelve-month 
basis. In 2021, the Company earned a $50.0 million sales-based milestone from Sanofi, upon aggregate annual sales of antibodies 
outside the United States (including Praluent) exceeding $1.5 billion, on a rolling twelve-month basis. 

The  Company's  significant  promised  goods  and  services  in  connection  with  the  Antibody  Collaboration  consist  of  providing 
research and development services, including the manufacturing of clinical supplies, and providing commercial-related services, 
including  the  manufacturing  of  commercial  supplies.  The  Company  recognizes  amounts  in  connection  with  the  Antibody 
Collaboration  based  on  the  amount  it  has  the  right  to  invoice  and  such  amount  corresponds  directly  with  the  Company's 
performance to date. 

The following table summarizes contract balances in connection with the Company's Antibody Collaboration with Sanofi:

(In millions)

Accounts receivable, net

Deferred revenue

As of December 31,

2023

2022

$ 

$ 

1,029.1  $ 

427.7  $ 

692.3 

415.8 

Immuno-Oncology 

The Company was previously a party to a collaboration with Sanofi for antibody-based cancer treatments in the field of immuno-
oncology  (the  "IO  Collaboration").  The  IO  Collaboration  was  governed  by  an  Amended  and  Restated  Immuno-oncology 
Discovery  and  Development  Agreement  ("Amended  IO  Discovery  Agreement"),  and  an  Immuno-oncology  License  and 
Collaboration Agreement ("IO License and Collaboration Agreement"). In connection with the execution of the original Immuno-
oncology Discovery and Development Agreement in 2015 ("2015 IO Discovery Agreement"), which was subsequently replaced 
by the Amended IO Discovery Agreement (as discussed below), Sanofi made a $265.0 million non-refundable up-front payment 
to  the  Company.  Pursuant  to  the  2015  IO  Discovery  Agreement,  the  Company  was  to  identify  and  validate  potential  immuno-
oncology targets and develop therapeutic antibodies against such targets through clinical proof-of-concept. 

Effective December 31, 2018, the Company and Sanofi entered into the Amended IO Discovery Agreement, which narrowed the 
scope of the existing discovery and development activities conducted by the Company under the 2015 IO Discovery Agreement to 
developing therapeutic bispecific antibodies targeting (i) BCMA and CD3 and (ii) MUC16 and CD3 through clinical proof-of-
concept. During 2021, Sanofi did not exercise its options to license rights to these product candidates; as a result, the Company 
retains the exclusive right to develop and commercialize such product candidates and Sanofi will receive a royalty on sales (if 
any). In addition, the Company has no further obligations to develop drug product candidates under the Amended IO Discovery 
Agreement. 

In  connection  with  the  execution  of  the  IO  License  and  Collaboration  Agreement  in  2015,  Sanofi  made  a  $375.0  million  non-
refundable up-front payment to the Company. Under the terms of the IO License and Collaboration Agreement, the parties were 
co-developing  and  co-commercializing  Libtayo.  The  parties  shared  equally,  on  an  ongoing  basis,  development  and 
commercialization  expenses  for  Libtayo.  The  Company  had  principal  control  over  the  development  of  Libtayo  and  led 
commercialization  activities  in  the  United  States,  while  Sanofi  led  commercialization  activities  outside  the  United  States.  The 
parties shared equally in profits and losses in connection with the commercialization of Libtayo.  

Recognition  of  the  up-front  payments  received  from  Sanofi  had  been  deferred  (recorded  within  Other  liabilities),  and  such 
amounts  were  being  recognized  over  the  remaining  period  in  which  the  Company  was  obligated  to  perform  development 
activities.  During  2021,  the  Company  updated  its  estimate  of  the  total  research  and  development  costs  expected  to  be  incurred 
(which resulted in a change to the estimate of the stage of completion) in connection with the IO Collaboration, and, as a result, 
recorded a cumulative catch-up adjustment of $66.9 million as a reduction to other operating income.

F-18

In connection with the Amended and Restated Immuno-oncology License and Collaboration Agreement with Sanofi (the "A&R 
IO  LCA")  described  below,  the  remaining  IO  Collaboration  Other  liabilities  balance  of  $241.0  million  as  of  July  1,  2022  was 
recognized as a reduction to the intangible asset recorded in connection with the transaction during 2022. 

Effective July 1, 2022, the Company obtained the exclusive right to develop, commercialize, and manufacture Libtayo worldwide 
under the A&R IO LCA. In connection with the A&R IO LCA, in 2022, the Company made a $900.0 million up-front payment to 
Sanofi,  as  well  as  a  $100.0  million  regulatory  milestone  payment.  In  addition,  Sanofi  was  eligible  to  earn  an  aggregate  of 
$100.0  million  in  Libtayo  sales-based  milestones  under  the  terms  of  the  A&R  IO  LCA,  of  which  they  earned  $65.0  million  in 
2022 and $35.0 million in 2023. The Company also pays Sanofi an 11% royalty on net product sales of Libtayo through March 
31, 2034. The transaction was accounted for as an asset acquisition and amounts paid to Sanofi in connection with obtaining the 
worldwide rights to Libtayo, including the up-front payment and any contingent consideration, are recorded as an intangible asset. 
See Note 8 for additional information related to the intangible asset.

In  accordance  with  the  Amended  IO  Discovery  Agreement,  the  Company  was  obligated  to  reimburse  Sanofi  for  half  of  the 
development  costs  it  funded  that  were  attributable  to  clinical  development  of  product  candidates  from  the  Company's  share  of 
profits  from  commercialized  IO  Collaboration  products.  Under  the  A&R  IO  LCA,  the  amount  of  development  costs  incurred 
under the IO Collaboration for which the Company was obligated to reimburse Sanofi was $35.0 million as of the effective date 
of the A&R IO LCA, and the Company pays Sanofi a 0.5% royalty on net product sales of Libtayo until all such development 
costs  have  been  reimbursed  by  Regeneron.  The  Company's  contingent  reimbursement  obligation  to  Sanofi  under  the  A&R  IO 
LCA was approximately $28 million as of December 31, 2023.

b. Bayer 

The Company is party to a license and collaboration agreement with Bayer for the global development and commercialization of 
EYLEA  8  mg  (aflibercept  8  mg)  and  EYLEA  (aflibercept)  outside  the  United  States.  Agreed-upon  development  expenses 
incurred by the Company and Bayer are generally shared equally. The Company is also obligated to use commercially reasonable 
efforts to supply clinical and commercial bulk product.

Within  the  United  States,  the  Company  is  responsible  for  commercialization  and  retains  profits  from  such  sales.  Bayer  is 
responsible for commercialization activities outside the United States, and the companies share equally in profits from such sales. 
In  Japan,  the  Company  was  entitled  to  receive  a  tiered  percentage  of  between  33.5%  and  40.0%  of  EYLEA  net  product  sales 
through  2021,  and  effective  January  1,  2022,  the  companies  share  equally  in  profits  from  sales  in  Japan.  The  Company  is 
obligated to reimburse Bayer out of its share of the collaboration profits for 50% of the agreed-upon development expenses that 
Bayer has incurred in accordance with a formula based on the amount of development expenses that Bayer has incurred and the 
Company's  share  of  the  collaboration  profits,  or  at  a  faster  rate  at  the  Company's  option.  The  Company's  contingent 
reimbursement obligation to Bayer was approximately $293 million as of December 31, 2023.

Amounts recognized in the Company's Statements of Operations in connection with its Bayer collaboration are as follows:

Year Ended December 31,
2022

2021

2023

$ 

$ 

$ 

$ 

1,376.4  $ 

1,317.4  $ 

1,349.2 

111.1  $ 

91.4  $ 

60.1 

—  $ 

21.9  $ 

— 

(44.0)  $ 

16.7  $ 

5.2 

(In millions)
Regeneron's share of profits in connection 
with commercialization of EYLEA 
outside the United States

Statement of Operations 
Classification

Collaboration revenue

Reimbursement for manufacturing of ex-

Collaboration revenue

U.S. commercial supplies

One-time payment in connection with 

Collaboration revenue

change in Japan arrangement

Regeneron's obligation for its share of Bayer 
R&D expenses, net of reimbursement of 
R&D expenses

(R&D expense)/Reduction 

of R&D expense

F-19

The following table summarizes contract balances in connection with the Company's Bayer collaboration:

(In millions)
Accounts receivable, net

Deferred revenue

As of December 31,

2023

2022

$ 

$ 

381.7  $ 

138.2  $ 

348.2 

131.9 

c. Alnylam

In 2019, the Company and Alnylam Pharmaceuticals, Inc. entered into a global, strategic collaboration to discover, develop, and 
commercialize  RNA  interference  ("RNAi")  therapeutics  for  a  broad  range  of  diseases  by  addressing  therapeutic  disease  targets 
expressed  in  the  eye  and  central  nervous  system  ("CNS"),  in  addition  to  a  select  number  of  targets  expressed  in  the  liver.  In 
connection with entering into the collaboration, the Company made an up-front payment of $400.0 million to Alnylam, and also 
purchased  shares  of  Alnylam  common  stock  for  $400.0  million.  For  each  program,  the  Company  provides  Alnylam  with  a 
specified  amount  of  funding  at  program  initiation  and  at  lead  candidate  designation.  Under  the  terms  of  the  collaboration,  the 
parties perform discovery research until designation of lead candidates. Following designation of a lead candidate, the parties may 
further advance such lead candidate under either a co-development/co-commercialization collaboration agreement (under which 
the parties are advancing ALN-APP and ALN-PNP, which are currently in clinical development) or a license agreement. 

The initial target nomination and discovery period is five years (which may under certain situations automatically be extended for 
up to seven years in the aggregate) (the "Research Term"). In addition, the Company has the option to extend the Research Term 
for an additional five-year period for a research extension fee of $300.0 million.

During 2023, the Company paid a $100.0 million development milestone to Alnylam, which was recorded to Acquired in-process 
research  and  development  expense,  upon  the  achievement  of  specified  proof-of-principle  criteria  for  the  ALN-APP  program. 
Alnylam  is  eligible  to  receive  an  additional  $100.0  million  clinical  proof-of-principle  milestone  in  connection  with  an  eye 
program.

Amounts recognized in the Company's Statements of Operations in connection with its Alnylam collaboration are as follows:

(In millions)
Regeneron's obligation for its share of 
Alnylam R&D expenses, net of 
reimbursement of R&D expenses

Development milestone

Statement of Operations 
Classification

(R&D expense)

Year Ended December 31,

2023

2022

2021

Acquired in-process research 

and development

$ 

(100.0)  $ 

—  $ 

— 

$ 

(74.1)  $ 

(55.8)  $ 

(60.5) 

The following table summarizes contract balances in connection with the Company's Alnylam collaboration:

(In millions)

As of December 31,

2023

2022

Accrued expenses and other current liabilities

$ 

22.6  $ 

7.4 

d. Roche

The  Company  is  a  party  to  a  collaboration  agreement  with  Roche  to  develop,  manufacture,  and  distribute  the  casirivimab  and 
imdevimab antibody cocktail (known as REGEN-COV in the United States and Ronapreve™ in other countries). Under the terms 
of the collaboration agreement, the parties jointly fund certain studies, and the Company has the right to distribute the product in 
the United States while Roche has the right to distribute the product outside the United States. The parties share gross profits from 
worldwide sales based on a pre-specified formula, depending on the amount of manufactured product supplied by each party to 
the market.

F-20

Amounts recognized in the Company's Statements of Operations in connection with its Roche collaboration are as follows:

(In millions)
Global gross profit payment from Roche in 
connection with sales of REGEN-COV 
and Ronapreve

Other
Reimbursement of R&D expenses

Global gross profit payment to Roche in 

connection with sales of REGEN-COV 
and Ronapreve

Statement of Operations 
Classification

Collaboration revenue

Collaboration revenue
(R&D expense)/Reduction 

of R&D expense
Cost of goods sold

$ 
$ 

$ 

$ 

Year Ended December 31,
2022

2023

2021

224.3  $ 
(13.3)  $ 

627.3  $ 
—  $ 

361.8 
— 

(1.5)  $ 

6.8  $ 

128.1 

—  $ 

—  $ 

259.6 

The following table summarizes contract balances in connection with the Company's Roche collaboration:

(In millions)

As of December 31,

2023

2022

Accounts receivable, net

$ 

—  $ 

396.6 

e. Intellia

In  2016,  the  Company  entered  into  a  license  and  collaboration  agreement  with  Intellia  Therapeutics,  Inc.  to  advance  CRISPR/
Cas9 gene-editing technology for in vivo therapeutic development. The parties collaborate to conduct research for the discovery, 
development, and commercialization of new therapies, in addition to the research and technology development of the CRISPR/
Cas9 platform.

Under  the  terms  of  the  2016  agreement,  the  parties  agreed  to  a  target  selection  process,  whereby  the  Company  may  obtain 
exclusive rights in up to 10 targets to be chosen by the Company during the collaboration term, subject to various adjustments and 
limitations  set  forth  in  the  agreement.  Certain  targets  that  either  the  Company  or  Intellia  selects  may  be  subject  to  a  co-
development  and  co-commercialization  arrangement  at  the  Company's  option  or  Intellia’s  option,  as  applicable.  NTLA-2001, 
which is in clinical development, is subject to a co-development and co-commercialization arrangement pursuant to which Intellia 
will lead development and commercialization activities and the parties share an agreed-upon percentage of development expenses 
and profits (if commercialized).

In 2020, the Company expanded its existing collaboration with Intellia to provide the Company with rights to develop products 
for  additional  in  vivo  CRISPR/Cas9-based  therapeutic  targets  and  for  the  parties  to  jointly  develop  potential  products  for  the 
treatment  of  hemophilia  A  and  B,  with  Regeneron  leading  development  and  commercialization  activities.  In  addition,  the 
Company  also  received  non-exclusive  rights  to  independently  develop  and  commercialize  ex  vivo  gene  edited  products.  In 
connection with the agreement, in 2020, the Company made a $70.0 million up-front payment.

In September 2023, the Company further expanded its existing collaboration to develop additional in vivo CRISPR-based gene 
editing  therapies  focused  on  neurological  and  muscular  diseases.  Intellia  will  lead  the  design  of  the  editing  methodology,  the 
Company will lead the design of the targeted viral vector delivery approach, and the parties share costs equally. Each company 
will  have  the  opportunity  to  lead  potential  development  and  commercialization  of  product  candidates  for  one  target,  and  the 
company  that  is  not  leading  development  and  commercialization  will  have  the  option  to  enter  into  a  co-development  and  co-
commercialization agreement for the target.

In  October  2023,  the  Company  elected  to  extend  the  period  for  selecting  targets  under  the  2016  license  and  collaboration 
agreement  for  an  additional  two  years  until  April  2026;  as  a  result,  the  Company  became  obligated  to  make  a  $30.0  million 
extension payment to Intellia (which was recorded to Acquired in-process research and development expense in 2023).

Amounts  recognized  in  the  Company's  Statements  of  Operations  in  connection  with  research  and  development  activities  co-
funded  under  the  Intellia  agreements  were  not  material  for  the  years  ended  December  31,  2023,  2022,  and  2021.  In  addition, 
contract balances in the Company's Balance Sheets in connection with the Intellia agreements were not material as of December 
31, 2023 and 2022.

F-21

f. Sonoma

In  March  2023,  the  Company  and  Sonoma  Biotherapeutics,  Inc.  entered  into  a  license  and  collaboration  agreement  to  bring 
together  the  Company's  VelociSuite®  technologies  with  Sonoma's  technology  platform  for  the  discovery,  development,  and 
commercialization of novel regulatory T cell ("Treg") therapies for autoimmune diseases. In connection with the agreement, the 
Company made a $45.0 million up-front payment (which was recorded to Acquired in-process research and development expense 
in 2023) and, in April 2023, the Company purchased an aggregate of $30.0 million of Sonoma preferred stock. Sonoma is also 
eligible  to  receive  a  $45.0  million  development  milestone  payment.  The  Company  and  Sonoma  will  co-fund  research  and 
development activities and share equally any future commercial expenses and profits. The Company will have the option to lead 
late-stage  development  and  commercialization  on  all  products  globally,  with  Sonoma  retaining  rights  to  co-promote  all  such 
products in the United States.

Amounts  recognized  in  the  Company's  Statements  of  Operations  in  connection  with  research  and  development  activities  co-
funded under the Sonoma agreement were not material for the year ended December 31, 2023. In addition, contract balances in 
the Company's Balance Sheets in connection with the Sonoma agreement were not material as of December 31, 2023.

g. U.S. Government 

In  2021,  the  Company  entered  into  agreements  with  the  U.S.  Department  of  Defense  and  the  U.S.  Department  of  Health  and 
Human Services ("HHS") to manufacture and deliver filled and finished drug product of REGEN-COV to the U.S. government. 
Roche supplied a portion of the doses to Regeneron to fulfill the Company's agreement with the U.S. government (see "Roche" 
above for further details regarding the Company's collaboration agreement with Roche). As of December 31, 2021, the Company 
had  completed  its  final  deliveries  of  drug  product  under  these  agreements.  See  Note  2  for  REGEN-COV  net  product  sales 
recognized during the year ended December 31, 2021 in connection with these agreements.

In August 2023, the Company expanded its Other Transaction Agreement ("OTA") with the Biomedical Advanced Research and 
Development Authority ("BARDA"), pursuant to which the HHS is obligated to fund up to 70% of the Company's costs incurred 
for  certain  development  activities  related  to  a  next-generation  COVID-19  monoclonal  antibody  therapy  for  the  prevention  of 
SARS-CoV-2  infection.  Pursuant  to  the  terms  of  the  expanded  agreement,  the  Company  could  receive  payments  of  up  to 
approximately $326 million in the aggregate to support clinical development, clinical manufacturing, and the regulatory licensure 
process.

Amounts recognized within Other revenue in the Company's Statements of Operations in connection with the expanded BARDA 
agreement were $50.4 million for the year ended December 31, 2023. 

The following table summarizes the Company's contract balances in connection with this BARDA agreement:

(In millions)

As of December 31,
2023

Accounts receivable, net

$ 

18.5 

h. Decibel 

In  2017,  the  Company  entered  into  an  agreement  with  Decibel  Therapeutics,  Inc.  to  discover  and  develop  new  potential 
therapeutics to protect, repair and restore hearing (including DB-OTO, which is currently in clinical development, and preclinical 
programs for GJB2-related and stereocilin-related hearing loss). In connection with the agreement, the Company also purchased 
shares of Decibel stock.

In  August  2023,  the  Company  entered  into  an  Agreement  and  Plan  of  Merger  to  acquire  Decibel,  and  in  September  2023,  the 
Company  completed  its  acquisition  of  Decibel  (which  was  accounted  for  as  a  business  combination).  The  Company  paid 
$101.3 million in cash (or $4.00 per share of Decibel common stock), of which $6.6 million was attributed to post-combination 
services  to  be  rendered  by  Decibel  equity  award  holders,  and  as  a  result,  was  excluded  from  the  amount  of  consideration 
transferred for purchase accounting. In addition, Decibel shareholders received one non-tradeable contingent value right ("CVR") 
per share of Decibel common stock, which entitles the holder to receive up to $3.50 per share in cash upon achievement of certain 
clinical development and regulatory milestones for DB-OTO within specified time periods. At closing, the Company recorded a 
liability related to the fair value of the CVRs of $43.7 million (see Note 5). The maximum aggregate amount that holders of the 
CVRs may be entitled to receive if all the milestones contemplated by the CVRs are achieved is approximately $97 million. 

The fair value of the Company's investment in Decibel stock immediately before the acquisition date was $10.3 million.

F-22

The following table summarizes the amounts recognized for assets acquired and liabilities assumed based on their estimated fair 
values as of the acquisition date:

(In millions)

Cash and cash equivalents

Marketable securities

Deferred tax assets, net
Indefinite-lived intangible asset related to in-

process research and development 

Goodwill

Other assets and liabilities, net

September 25,

2023

$ 

$ 

42.2 

12.1 

58.1 

42.5 

5.2 

(11.4) 

148.7 

The final determination of fair values of assets acquired, liabilities assumed, and tax-related items will be completed no later than 
one year from the acquisition date.

i. Checkmate

In  2022,  the  Company  completed  its  acquisition  of  Checkmate  Pharmaceuticals,  Inc.  for  a  total  equity  value  of  approximately 
$250 million. As a result of the transaction, which was accounted for as an asset acquisition, the Company recorded, during 2022, 
(i)  a  charge  of  $195.0  million  to  Acquired  in-process  research  and  development  and  (ii)  net  assets  of  $61.7  million,  including 
$26.4 million of cash and cash equivalents acquired, related to the assets acquired (including deferred tax assets and investments) 
and liabilities assumed.

j. Other 

In addition to the collaboration agreements discussed above, the Company has various other license and collaboration agreements 
that  are  not  individually  significant  to  its  operating  results  or  financial  condition  at  this  time.  Pursuant  to  the  terms  of  those 
agreements,  the  Company  may  be  required  to  pay,  or  it  may  receive,  additional  amounts  contingent  upon  the  occurrence  of 
various  future  events  (e.g.,  upon  the  achievement  of  various  development  and  commercial  milestones)  which  in  the  aggregate 
could be significant. The Company may also incur, or get reimbursed for, significant research and development costs. 

The  Company  has  also  in-licensed  patent  and/or  technology  pursuant  to  agreements  which  contain  provisions  that  require  the 
Company  to  pay  royalties,  as  defined,  at  rates  that  range  from  0.5%  to  12.0%,  in  the  event  the  Company  sells  or  licenses  any 
proprietary products developed under the respective agreements. 

As described above, as a result of obtaining worldwide rights to Libtayo, the Company pays Sanofi a royalty on net product sales 
of Libtayo. In addition, in 2018, the Company and Sanofi entered into a license agreement with Bristol-Myers Squibb Company, 
E. R. Squibb & Sons, L.L.C., and Ono Pharmaceutical Co., Ltd. to obtain a license under certain patents owned and/or exclusively 
licensed by one or more of those parties that includes the right to develop and sell Libtayo. Under the agreement, the Company 
paid royalties of 8.0% on worldwide sales of Libtayo through December 31, 2023, and is obligated to pay royalties of 2.5% from 
January 1, 2024 through December 31, 2026. Prior to July 1, 2022, royalties on such sales were shared equally by the Company 
and Sanofi.

For the years ended December 31, 2023, 2022, and 2021, the Company recorded royalty expense (net of reimbursements from 
collaborators,  as  applicable)  in  its  Statements  of  Operations  of  $117.6  million,  $84.5  million,  and  $66.9  million,  respectively, 
based on product sales under various licensing agreements.

F-23

 
 
 
 
 
4. Marketable Securities

Marketable  securities  as  of  December  31,  2023  and  2022  consist  of  both  available-for-sale  debt  securities  of  investment  grade 
issuers (see below and Note 5) as well as equity securities of publicly traded companies (see Note 5). 

The following tables summarize the Company's investments in available-for-sale debt securities:

(In millions)

As of December 31, 2023

Corporate bonds

U.S. government and government agency obligations

Sovereign bonds

Commercial paper

Certificates of deposit

Asset-backed securities

As of December 31, 2022

Corporate bonds

U.S. government and government agency obligations

Sovereign bonds

Commercial paper

Certificates of deposit

Asset-backed securities

Amortized

Unrealized

Cost Basis

Gains

Losses

Fair

Value

$ 

6,492.5  $ 

10.4  $ 

(104.9)  $ 

6,398.0 

4,839.6 

58.1 

636.8 

520.8 

88.2 

2.4 

— 

0.2 

0.6 

0.1 

(8.6)   

(0.9)   

(0.2)   

— 

(1.2)   

4,833.4 

57.2 

636.8 

521.4 

87.1 

$  12,636.0  $ 

13.7  $ 

(115.8)  $  12,533.9 

$ 

6,975.5  $ 

—  $ 

(291.1)  $ 

6,684.4 

2,945.4 

67.1 

121.1 

182.1 

28.9 

0.9 

— 

— 

— 

— 

(6.9)   

(3.0)   

— 

(0.1)   

(1.7)   

2,939.4 

64.1 

121.1 

182.0 

27.2 

$  10,320.1  $ 

0.9  $ 

(302.8)  $  10,018.2 

The  Company  classifies  its  investments  in  available-for-sale  debt  securities  based  on  their  contractual  maturity  dates.  The 
available-for-sale  debt  securities  as  of  December  31,  2023  mature  at  various  dates  through  April  2029.  The  fair  values  of 
available-for-sale debt securities by contractual maturity consist of the following:

As of December 31,

$ 

2023
8,114.8  $ 
4,414.5 
4.6 

2022
4,636.4 
5,381.4 
0.4 
$  12,533.9  $  10,018.2 

(In millions)
Maturities within one year
Maturities after one year through five years
Maturities after five years

F-24

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The  following  table  shows  the  fair  value  of  the  Company's  available-for-sale  debt  securities  that  have  unrealized  losses, 
aggregated by investment category and length of time that the individual securities have been in a continuous loss position. 

(In millions)
As of December 31, 2023

Fair Value

Unrealized 
Loss

Fair Value

Unrealized 
Loss

Fair Value

Unrealized 
Loss

Less than 12 Months

12 Months or Greater

Total

Corporate bonds
U.S. government and government 

agency obligations

Sovereign bonds
Commercial paper
Asset-backed securities

As of December 31, 2022

Corporate bonds
U.S. government and government 

agency obligations

Sovereign bonds

Certificates of deposit

Asset-backed securities

$ 

2,363.3  $ 

(2.4)  $ 

4,034.7  $ 

(102.5)  $ 

6,398.0  $ 

(104.9) 

4,780.6 
12.4 
636.8 
61.8 

(6.0)   
(0.1)   
(0.2)   
(0.3)   

52.7 
44.8 
— 
25.3 

(2.6)   
(0.8)   
— 
(0.9)   

4,833.3 
57.2 
636.8 
87.1 

(8.6) 
(0.9) 
(0.2) 
(1.2) 

$ 

7,854.9  $ 

(9.0)  $ 

4,157.5  $ 

(106.8)  $  12,012.4  $ 

(115.8) 

$ 

2,445.4  $ 

(73.1)  $ 

4,200.4  $ 

(218.0)  $ 

6,645.8  $ 

(291.1) 

785.2 

18.6 

40.2 

11.5 

(2.0)   

(1.1)   

(0.1)   

(0.6)   

71.0 

45.6 

— 

15.2 

(4.9)   

(1.9)   

— 

(1.1)   

856.2 

64.2 

40.2 

26.7 

(6.9) 

(3.0) 

(0.1) 

(1.7) 

$ 

3,300.9  $ 

(76.9)  $ 

4,332.2  $ 

(225.9)  $ 

7,633.1  $ 

(302.8) 

The unrealized losses on corporate bonds as of December 31, 2023 and 2022 were primarily driven by increased interest rates. 
The Company has reviewed its portfolio of available-for-sale debt securities and determined that the decline in fair value below 
cost did not result from credit-related factors. In addition, the Company does not intend to sell, and it is not more likely than not 
that the Company will be required to sell, such securities before recovery of their amortized cost bases. 

With  respect  to  marketable  securities,  for  the  years  ended  December  31,  2023,  2022,  and  2021,  amounts  reclassified  from 
Accumulated  other  comprehensive  loss  into  Other  income  (expense),  net  were  related  to  realized  gains/losses  on  sales  of 
available-for-sale debt securities. Realized gains and losses on sales of marketable securities were not material for the years ended 
December 31, 2023, 2022, and 2021. 

The Company recognized interest income of $495.9 million, $160.1 million, and $45.8 million for the years ended December 31, 
2023, 2022, and 2021, respectively, in Other income (expense), net.

F-25

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5. Fair Value Measurements

The  table  below  summarizes  the  Company's  assets  and  liabilities  which  are  measured  at  fair  value  on  a  recurring  basis.  The 
following fair value hierarchy is used to classify assets and liabilities, based on inputs to valuation techniques utilized to measure 
fair value:

•
•

•

Level 1 - Quoted prices in active markets for identical assets or liabilities
Level  2  -  Significant  other  observable  inputs,  such  as  quoted  market  prices  for  similar  instruments  in  active  markets, 
quoted  prices  for  identical  or  similar  instruments  in  markets  that  are  not  active,  or  model-based  valuations  in  which 
significant inputs used are observable
Level 3 - Significant other unobservable inputs

Fair Value Measurements at Reporting Date

Fair Value

Level 1

Level 2

Level 3

$ 

928.1  $ 

6.4  $ 

921.7  $ 

6,398.0 

4,833.4 

57.2 

636.8 

521.4 

87.1 

864.5 

112.9 

— 

— 

— 

— 

— 

— 

864.5 

112.9 

6,398.0 

4,833.4 

57.2 

636.8 

521.4 

87.1 

— 

— 

$ 

14,439.4  $ 

983.8  $ 

13,455.6  $ 

U.S. government and government agency obligations  

(In millions)

As of December 31, 2023

Assets:

Cash equivalents

Available-for-sale debt securities:

Corporate bonds

Sovereign bonds

Commercial paper

Certificates of deposit

Asset-backed securities

Equity securities (unrestricted)

Equity securities (restricted)

Total assets

Liabilities:

As of December 31, 2022

Assets:

Cash equivalents

Available-for-sale debt securities:

Corporate bonds

Commercial paper

Certificates of deposit

Asset-backed securities

Equity securities (unrestricted)

Equity securities (restricted)

Total assets

Contingent consideration - CVRs

$ 

43.7  $ 

—  $ 

—  $ 

43.7 

U.S. government and government agency obligations  
Sovereign bonds

$ 

1,662.8  $ 

88.3  $ 

1,574.5  $ 

6,684.4 

2,939.4 
64.1 

121.1 

182.0 

27.2 

24.6 

1,185.4 

— 

— 
— 

— 

— 

— 

24.6 

1,185.4 

6,684.4 

2,939.4 
64.1 

121.1 

182.0 

27.2 

— 

— 

$ 

12,891.0  $ 

1,298.3  $ 

11,592.7  $ 

The  Company  held  certain  restricted  equity  securities  as  of  December  31,  2023  which  are  subject  to  transfer  restrictions  that 
expire at various dates through 2024.

During the years ended December 31, 2023 and 2022, the Company recorded $237.8 million and $39.8 million, respectively, of 
net  unrealized  losses  on  equity  securities  in  Other  income  (expense),  net.  During  the  year  ended  December  31,  2021,  the 
Company recorded $386.1 million of net unrealized gains on equity securities in Other income (expense), net. In addition, during 
the year ended December 31, 2023, the Company recorded a write-down of $29.0 million in Other income (expense), net related 
to the Company's investments in private companies. 

F-26

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 
— 

— 

— 

— 

— 

— 

— 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In addition to the investments summarized in the table above, as of December 31, 2023 and 2022, the Company had $74.3 million 
and $48.3 million, respectively, in equity investments that do not have a readily determinable fair value. These investments are 
recorded within Other noncurrent assets.

As described in Note 3, in September 2023, the Company acquired Decibel and recorded a liability for the CVRs within other 
liabilities. The fair value of the CVR liability is determined based on the probability of achieving certain clinical development and 
regulatory milestones and estimated discount rates. Through December 31, 2023, there were no changes in the fair value of the 
CVRs subsequent to the date of acquisition.

The fair value of the Company's long-term debt (see Note 10), which was determined based on Level 2 inputs, was estimated to 
be $1.528 billion and $1.443 billion as of December 31, 2023 and 2022, respectively.

6. Inventories

Inventories consist of the following:

(In millions)

Raw materials

Work-in-process

Finished goods

Deferred costs

As of December 31,

2023

2022

$ 

789.3  $ 

1,121.8 

147.3 

522.1 

818.4 

963.1 

98.6 

521.8 

$ 

2,580.5  $ 

2,401.9 

Deferred costs represent the costs of product manufactured and shipped to the Company's collaborators for which recognition of 
revenue has been deferred. 

Inventory balances in the table above are net of reserves of $705.9 million and $720.7 million as of December 31, 2023 and 2022, 
respectively.  For  the  years  ended  December  31,  2023,  2022,  and  2021,  Cost  of  goods  sold  included  inventory  write-offs  and 
reserves of $102.3 million, $258.7 million, and $457.1 million, respectively. Inventory write-offs and reserves for the years ended 
2022 and 2021 primarily related to REGEN-COV.

7. Property, Plant, and Equipment

Property, plant, and equipment, net consists of the following:

(In millions)

Building and improvements
Leasehold improvements
Laboratory equipment

Computer equipment and software
Furniture, office equipment, and 

$ 

other

Land

Construction in progress

As of December 31,

2023

2022

2,423.1  $ 
133.9 
1,384.5 

389.7 

165.9 

283.1 

1,345.0 

6,125.2 

2,270.0 
114.3 
1,315.3 

337.4 

150.2 

264.5 

980.5 

5,432.2 

Accumulated depreciation and 

amortization

(1,978.8)   

4,146.4  $ 

(1,669.2) 

3,763.0 

$ 

Property, plant, and equipment in the table above includes leased property under the Company's finance lease at its Tarrytown, 
New York facility. See Note 11.

Depreciation and amortization expense on property, plant, and equipment was $328.8 million, $303.9 million, and $281.1 million 
for the years ended December 31, 2023, 2022, and 2021, respectively. 

F-27

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
As  of  December  31,  2023  and  2022,  $3.375  billion  and  $2.960  billion,  respectively,  of  the  Company's  net  property,  plant,  and 
equipment was located in the United States and $771.4 million and $803.0 million, respectively, was located outside the United 
States (primarily in Ireland).

8. Intangible Assets

Intangible assets. net consist of the following:

(In millions)
Acquired product 
rights - Libtayo

Other intangibles
Acquired in-process 

research and 
development

As of December 31,

2023

2022

Estimated 
Useful 
Life

Gross 
Carrying 
Amount

Accumulated 
Amortization

Net 
Carrying 
Amount

Gross 
carrying 
Amount

Accumulated 
Amortization

Net 
Carrying 
Amount

13 years
8 years

$ 

1,119.1  $ 
10.0 

(126.7)  $ 
(6.3)   

992.4  $ 
3.7 

946.3  $ 
10.0 

(35.7)  $ 
(5.1)   

910.6 
4.9 

Indefinite

42.5 

— 

42.5 

— 

— 

— 

$ 

1,171.6  $ 

(133.0)  $  1,038.6  $ 

956.3  $ 

(40.8)  $ 

915.5 

As described in Note 3, during the year ended December 31, 2023, the Company recorded an indefinite-lived intangible asset of 
$42.5 million in connection with its acquisition of Decibel.

During the year ended December 31, 2022, the Company recorded an intangible asset in connection with obtaining the exclusive 
right to develop, commercialize, and manufacture Libtayo worldwide. The intangible asset recognized upon the effective date of 
the  A&R  IO  LCA  primarily  consisted  of  the  $900.0  million  up-front  payment,  offset  by  the  remaining  IO  Collaboration  other 
liabilities balance of $241.0 million. Additionally, during the years ended December 31, 2023 and 2022, the Company recorded 
additions to the Libtayo intangible asset related to contingent consideration (including regulatory and sales-based milestones) due 
to Sanofi. See Note 3.

Amortization expense on intangible assets was $92.2 million and $37.6 million for the years ended December 31, 2023 and 2022, 
respectively. Amortization expense for the year ended December 31, 2021 was not material.

As  of  December  31,  2023,  assuming  no  changes  in  the  gross  carrying  amount  of  intangible  assets,  amortization  expense  is 
estimated to be approximately $85 million for each of the years ending December 31, 2024 through December 31, 2028.

9. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consist of the following:

(In millions)

As of December 31,

2023

2022

Accrued payroll and related costs

$ 

618.2  $ 

Accrued clinical expenses
Accrued sales-related costs
Other accrued expenses and 

liabilities

292.2 
780.8 

666.7 

$ 

2,357.9  $ 

497.3 

295.0 
633.6 

648.3 

2,074.2 

F-28

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10. Debt

Credit Facility

In  December  2022,  the  Company  entered  into  an  agreement  with  a  syndicate  of  lenders  (the  "2022  Credit  Agreement")  which 
provides  for  a  $750.0  million  senior  unsecured  five-year  revolving  credit  facility  (the  "2022  Credit  Facility")  and  replaced  the 
Company's  then-existing  credit  agreement,  which  was  contemporaneously  terminated.  The  2022  Credit  Agreement  includes  an 
option  for  the  Company  to  elect  to  increase  the  commitments  under  the  2022  Credit  Facility  and/or  to  enter  into  one  or  more 
tranches of term loans in the aggregate principal amount of up to $500.0 million, subject to the consent of the lenders providing 
the additional commitments or term loans, as applicable, and certain other conditions. The 2022 Credit Agreement also provides a 
$50.0 million sublimit for letters of credit.

Proceeds of the loans under the 2022 Credit Facility may be used to finance working capital needs, and for general corporate or 
other lawful purposes, of Regeneron and its subsidiaries. Regeneron Pharmaceuticals, Inc. has guaranteed all obligations under 
the 2022 Credit Facility. The 2022 Credit Agreement includes an option for the Company to elect to extend the maturity date of 
the 2022 Credit Facility beyond December 2027, subject to the consent of the extending lenders and certain other conditions.

The Company had no borrowings outstanding under the 2022 Credit Facility as of December 31, 2023. 

The 2022 Credit Agreement contains operating covenants and a maximum total leverage ratio financial covenant. The Company 
was in compliance with all covenants of the 2022 Credit Agreement as of December 31, 2023.

Senior Notes

In 2020, the Company issued and sold $1.250 billion aggregate principal amount of senior unsecured notes due 2030 and $750 
million  aggregate  principal  amount  of  senior  unsecured  notes  due  2050  (collectively,  the  "Notes").  The  underwriting  discounts 
and offering expenses are being amortized as additional interest expense over the period from issuance through maturity.

Long-term debt in connection with the Notes, net of underwriting discounts and offering expenses, consists of the following:

(In millions)

1.750% Senior Notes due September 2030

2.800% Senior Notes due September 2050

As of December 31,

2023

2022

$ 

$ 

1,242.2  $ 

740.7 

1,982.9  $ 

1,241.0 

740.4 

1,981.4 

Interest  on  each  series  of  Notes  is  payable  semi-annually  in  arrears  on  March  15  and  September  15  of  each  year  until  their 
respective maturity dates. Interest expense related to the Notes was $44.4 million in each of the years ended December 31, 2023, 
2022, and 2021.

The  Notes  may  be  redeemed  at  the  Company’s  option  at  any  time  at  100%  of  the  principal  amount  plus  accrued  and  unpaid 
interest,  and,  until  a  specified  period  before  maturity,  a  specified  make-whole  amount.  The  Notes  contain  a  change-of-control 
provision that, under certain circumstances, may require the Company to offer to repurchase the Notes at a price equal to 101% of 
the principal amount plus accrued and unpaid interest. The Notes also contain certain limitations on the Company's ability to incur 
liens and enter into sale and leaseback transactions, as well as customary events of default.

11. Leases

The Company conducts certain of its research, development, and administrative activities at leased facilities. The Company also 
leases vehicles and other assets. 

Tarrytown, New York Lease

The  Company  is  party  to  a  Third  Amended  and  Restated  Lease  and  Remedies  Agreement  (the  "Third  Amended  and  Restated 
Lease") with BA Leasing BSC, LLC, an affiliate of Banc of America Leasing & Capital, LLC ("BAL"), as lessor, which relates to 
the  Company’s  lease  of  laboratory  and  office  facilities  in  Tarrytown,  New  York  (the  “Facility”);  and  a  Third  Amended  and 
Restated Participation Agreement (the "Third Amended and Restated Participation Agreement") with Bank of America, N.A., as 
administrative agent (the "Administrative Agent"), and a syndicate of lenders (collectively with BAL, the "Participants"), as rent 
assignees.  The  Third  Amended  and  Restated  Lease  and  Third  Amended  and  Restated  Participation  Agreement  provide  for  a 
March  2027  maturity  date  of  the  $720.0  million  lease  financing  (previously  advanced  by  the  Participants  in  March  2017  in 
connection with the acquisition by BAL of the Facility and the Company's lease of the Facility from BAL) and the end of the term 

F-29

 
 
of the Company's lease of the Facility from BAL, at which time all amounts outstanding thereunder will become due and payable 
in full.

In accordance with the terms of the Third Amended and Restated Lease, the Company pays all maintenance, insurance, taxes, and 
other costs arising out of the use of the Facility. The Company is also required to make monthly payments of basic rent during the 
remaining  term  of  the  Third  Amended  and  Restated  Lease  to  satisfy  the  yield  payable  to  the  Participants  on  their  outstanding 
advances  under  the  Third  Amended  and  Restated  Participation  Agreement.  Such  advances  accrue  yield  at  a  variable  rate  per 
annum based on the one-month forward-looking Secured Overnight Financing Rate ("SOFR") term rate, plus a spread adjustment, 
plus an applicable margin that varies with the Company's debt rating and total leverage ratio.

The  Third  Amended  and  Restated  Participation  Agreement  and  Third  Amended  and  Restated  Lease  include  an  option  for  the 
Company to elect to further extend the maturity date of the Third Amended and Restated Participation Agreement and the term of 
the Third Amended and Restated Lease for an additional five-year period, subject to the consent of all the Participants and certain 
other conditions. The Company also has the option prior to the end of the term of the Third Amended and Restated Lease to (a) 
purchase the Facility by paying an amount equal to the outstanding principal amount of the Participants' advances under the Third 
Amended and Restated Participation Agreement, all accrued and unpaid yield thereon, and all other outstanding amounts under 
the Third Amended and Restated Participation Agreement, Third Amended and Restated Lease, and certain related documents or 
(b) sell the Facility to a third party on behalf of BAL.

The Third Amended and Restated Lease is classified as a finance lease as the Company has the option to purchase the Facility 
under terms that make it reasonably certain to be exercised. The agreements governing the Third Amended and Restated Lease 
financing  contain  financial  and  operating  covenants.  Such  financial  covenants  and  certain  of  the  operating  covenants  are 
substantially  similar  to  the  covenants  set  forth  in  the  2022  Credit  Agreement.  The  Company  was  in  compliance  with  all  such 
covenants as of December 31, 2023.

Aggregate Lease Information

Amounts recognized in the Consolidated Balance Sheet related to the Company's leases are included in the table below. 

(In millions)
Assets:

Classification

As of December 31,

2023

2022

Finance lease right-of-use assets
Operating lease right-of-use assets

Property, plant, and equipment, net(a) 
Other noncurrent assets(b)

Liabilities:

Finance lease liabilities - noncurrent
Operating lease liabilities - current
Operating lease liabilities - noncurrent Other noncurrent liabilities

Finance lease liabilities
Accrued expenses and other current liabilities

$ 

$ 

$ 

$ 

605.7  $ 
78.0 
683.7  $ 

720.0  $ 
19.0 
68.7 
807.7  $ 

620.3 
71.2 
691.5 

720.0 
12.4 
55.8 
788.2 

(a) Finance lease right-of-use assets were recorded net of accumulated amortization of $133.9 million and $119.4 million as of 
December 31, 2023 and 2022, respectively.
(b) Operating lease right-of-use assets were recorded net of accumulated amortization of $44.6 million and $31.0 million as of December 31, 
2023 and 2022, respectively.

F-30

 
 
 
 
 
 
Lease costs consist of the following: 

(In millions)
Operating lease costs

Finance lease costs:

Amortization of finance lease right-of-use assets

Interest on finance lease liabilities

Total finance lease costs

Total lease costs

Year Ended December 31,

2023

2022

2021

$ 

19.2  $ 

12.4  $ 

10.3 

14.5 

45.0 

59.5 

14.5 

21.6 

36.1 

$ 

78.7  $ 

48.5  $ 

14.4 

11.9 

26.3 

36.6 

Other information related to the Company's leases includes the following: 

Weighted-average remaining lease term (in years):

Finance leases
Operating leases

Weighted-average discount rate:

Finance leases
Operating leases

As of December 31,

2023

2022

3.2
7.4

 5.08 %
 5.38 %

4.2
7.2

 4.84 %
 5.20 %

Supplemental cash flow information related to the Company's leases includes the following: 

(In millions)
Cash paid for amounts included in the measurement of 

operating lease liabilities (included within cash flows from 
operating activities)

Right-of-use assets obtained in exchange for operating lease 

liabilities

Year Ended December 31,

2023

2022

2021

$ 

$ 

22.5  $ 

7.7  $ 

10.2 

31.9  $ 

35.1  $ 

0.2 

The following is a maturity analysis of the Company's lease liabilities as of December 31, 2023:

(In millions)

Finance Leases

Operating Leases

Total

2024
2025

2026

2027

2028

Thereafter

Total undiscounted lease payments

Imputed interest

Total lease liabilities

$ 

$ 

24.1  $ 
20.1 

15.6 

12.4 

11.0 

20.1 

103.3 

(15.6)   

87.7  $ 

68.9 
59.6 

46.5 

740.8 

11.0 

20.1 

946.9 

(139.2) 

807.7 

44.8  $ 
39.5 

30.9 

728.4 

— 

— 

843.6 

(123.6)   

720.0  $ 

F-31

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
12. Stockholders' Equity 

The Company's Restated Certificate of Incorporation, as amended, provides for the issuance of up to 40 million shares of Class A 
Stock, par value $0.001 per share, and 320 million shares of Common Stock, par value $0.001 per share. Shares of Class A Stock 
are convertible, at any time, at the option of the holder into shares of Common Stock on a share-for-share basis. Holders of Class 
A Stock have rights and privileges identical to Common Stockholders except that each share of Class A is entitled to ten votes per 
share, while each share of Common Stock is entitled to one vote per share. Class A Stock may only be transferred to specified 
Permitted Transferees, as defined. Under the Company's Restated Certificate of Incorporation, the Company's board of directors is 
authorized to issue up to 30 million shares of Preferred Stock, in series, with rights, privileges, and qualifications of each series 
determined by the board of directors. 

Share Repurchase Programs

In January 2021, the Company's board of directors authorized a share repurchase program to repurchase up to $1.5 billion of the 
Company's Common Stock. As of December 31, 2021, the Company had repurchased the entire $1.5 billion of its Common Stock 
that it was authorized to repurchase under the program.

In November 2021, the Company's board of directors authorized a share repurchase program to repurchase up to $3.0 billion of 
the Company's Common Stock. As of June 30, 2023, the Company had repurchased the entire $3.0 billion of its Common Stock 
that it was authorized to repurchase under the program.

In January 2023, the Company's board of directors authorized an additional share repurchase program to repurchase up to $3.0 
billion  of  the  Company's  Common  Stock.  The  share  repurchase  program  permits  the  Company  to  make  repurchases  through  a 
variety  of  methods,  including  open-market  transactions  (including  pursuant  to  a  trading  plan  adopted  in  accordance  with  Rule 
10b5-1 of the Exchange Act), privately negotiated transactions, accelerated share repurchases, block trades, and other transactions 
in compliance with Rule 10b-18 of the Exchange Act. Repurchases may be made from time to time at management's discretion, 
and  the  timing  and  amount  of  any  such  repurchases  will  be  determined  based  on  share  price,  market  conditions,  legal 
requirements,  and  other  relevant  factors.  The  program  has  no  time  limit  and  can  be  discontinued  at  any  time.  There  can  be  no 
assurance  as  to  the  timing  or  number  of  shares  of  any  repurchases  in  the  future.  As  of  December  31,  2023,  $1.531  billion 
remained available for share repurchases under the program.

The  table  below  summarizes  the  shares  of  the  Company's  Common  Stock  repurchased  and  the  cost  of  the  shares,  which  were 
recorded as Treasury Stock.

(In millions)

Number of shares

Total cost of shares

13. Long-Term Incentive Plans

Year Ended December 31,

2023

2022

2021

2.9 

3.3 

3.0 

$ 

2,214.6  $ 

2,099.8  $ 

1,655.0 

The  Company  has  used  long-term  incentive  plans  for  the  purpose  of  granting  equity  awards  to  employees  of  the  Company, 
including officers, and non-employee members of the Company's board of directors (collectively, "Participants"). The Participants 
may receive awards as determined by a committee of independent members of the Company's board of directors or, to the extent 
authorized by such committee with respect to certain Participants, a duly authorized employee (collectively, the "Committee"). 
The incentive plan currently used by the Company is the Second Amended and Restated Regeneron Pharmaceuticals, Inc. 2014 
Long-Term Incentive Plan (the "Second Amended and Restated 2014 Incentive Plan"). It was most recently adopted and approved 
by the Company's shareholders in 2020. As of the most recent shareholder approval date, the Second Amended and Restated 2014 
Incentive Plan provided for the issuance of up to 22.3 million shares of Common Stock in respect of awards. In addition, upon 
expiration, forfeiture, surrender, exchange, cancellation, or termination of any award previously granted under the Amended and 
Restated Regeneron Pharmaceuticals, Inc. 2014 Long-Term Incentive Plan (the "Amended and Restated 2014 Incentive Plan"), 
the  Regeneron  Pharmaceuticals,  Inc.  2014  Long-Term  Incentive  Plan  (the  "Original  2014  Incentive  Plan"),  or  the  Second 
Amended and Restated 2000 Long-Term Incentive Plan (the "2000 Incentive Plan"), any shares subject to such award are added 
to the pool of shares available for grant under the Second Amended and Restated 2014 Incentive Plan.

The  awards  that  may  be  made  under  the  Second  Amended  and  Restated  2014  Incentive  Plan  include:  (a)  non-qualified  stock 
options and incentive stock options, (b) restricted stock awards, (c) shares of phantom stock (also referred to as restricted stock 
units, which may be time- or performance-based), and (d) other awards. Any award granted may (but is not required to) be subject 
to vesting based on the attainment by the Company of performance goals pre-established by the Committee. 

F-32

 
 
 
Stock  option  awards  grant  Participants  the  right  to  purchase  shares  of  Common  Stock  at  prices  determined  by  the  Committee, 
with exercise prices that are equal to or greater than the average of the high and low market prices of the Company's Common 
Stock on the date of grant (the "Market Price"). Options vest over a period of time determined by the Committee, generally on a 
pro rata basis over a four-year period. The Committee also determines the expiration date of each option. The maximum term of 
options that have been awarded under the 2000 Incentive Plan, the Original 2014 Incentive Plan, the Amended and Restated 2014 
Incentive Plan, and the Second Amended and Restated 2014 Incentive Plan (collectively, the "Incentive Plans") is ten years.

Restricted stock awards grant Participants shares of restricted Common Stock or allow Participants to purchase such shares at a 
price determined by the Committee. Such shares are nontransferable for a period determined by the Committee ("vesting period"). 
Should employment terminate, as specified in the Incentive Plans, except as determined by the Committee in its discretion and 
subject to the applicable Incentive Plan documents, the ownership of any unvested restricted stock awards will be transferred to 
the Company.

Phantom stock awards provide the Participant the right to receive Common Stock or an amount of cash based on the value of the 
Common Stock at a future date. The award is subject to such restrictions, if any, as the Committee may impose at the date of grant 
or thereafter, including a specified period of employment or the achievement of performance goals. Time-based restricted stock 
units and performance-based restricted stock units are each a type of phantom stock award permitted under the Second Amended 
and Restated 2014 Incentive Plan.  

The  Incentive  Plans  contain  provisions  that  allow  for  the  Committee  to  provide  for  the  immediate  vesting  of  awards  upon  a 
change in control of the Company, as defined in the Incentive Plans.

As  of  December  31,  2023,  there  were  14.6  million  shares  available  for  future  grants  under  the  Second  Amended  and  Restated 
2014 Incentive Plan. 

a.  Stock Options

The table below summarizes the activity related to stock option awards under the Company's Incentive Plans during 2023.

Number of 
Shares
(In millions)

Weighted
-Average 
Exercise 
Price

Weighted-
Average 
Remaining 
Contractual 
Term 

Intrinsic Value 
(In millions)

Outstanding as of December 31, 2022

2023: Granted

Forfeited

Exercised

15.6  $  481.62 

1.6  $  835.91 

(0.2)  $  580.17 

(2.8)  $  412.05 

Outstanding as of December 31, 2023

14.2  $  534.13 

6.0 years $ 

4,918.6 

Vested and expected to vest as of 

December 31, 2023

13.8  $  526.95 

5.9 years $ 

4,852.2 

Exercisable as of December 31, 2023

9.6  $  450.01 

4.7 years $ 

4,118.0 

The  Company  satisfies  stock  option  exercises  with  newly  issued  shares  of  the  Company's  Common  Stock.  The  total  intrinsic 
value of stock options exercised during 2023, 2022, and 2021 was $1.096 billion, $1.214 billion, and $1.707 billion, respectively. 
The  intrinsic  value  represents  the  amount  by  which  the  market  price  of  the  underlying  stock  exceeds  the  exercise  price  of  an 
option.

F-33

 
 
 
 
 
 
 
The table below summarizes the weighted-average exercise prices and weighted-average grant-date fair values of options issued 
during the years ended December 31, 2023, 2022, and 2021. 

Number of 
Options 
Granted
(In millions)

Weighted-
Average 
Exercise 
Price

Weighted-
Average 
Fair Value

2023:

Exercise price equal to Market Price

1.6  $ 

835.91  $ 

264.37 

2022:

Exercise price equal to Market Price

2.0  $ 

705.02  $ 

220.88 

2021:

Exercise price equal to Market Price

2.3  $ 

628.43  $ 

174.20 

For  the  years  ended  December  31,  2023,  2022,  and  2021,  the  Company  recognized  $357.1  million,  $341.9  million,  and 
$328.7 million, respectively, of stock-based compensation expense related to stock option awards (net of amounts capitalized as 
inventory,  which  were  not  material  for  each  of  the  three  years).  As  of  December  31,  2023,  there  was  $589.6  million  of  stock-
based compensation cost related to unvested stock options, net of estimated forfeitures, which had not yet been recognized. The 
Company expects to recognize this compensation cost over a weighted-average period of 1.8 years.

Fair Value Assumptions:

The following table summarizes the weighted average values of the assumptions used in computing the fair value of option grants 
during 2023, 2022, and 2021.

Expected volatility

2023

2022

2021

 26 %

 28 %

 27 %

Expected lives from grant date

5.1 years

5.2 years

5.5 years

Expected dividend yield

Risk-free interest rate

 0 %

 0 %

 0 %

 4.29 %

 3.50 %

 1.22 %

Expected volatility has been estimated based on actual movements in the Company's stock price over the most recent historical 
periods  equivalent  to  the  options'  expected  lives.  Expected  lives  are  principally  based  on  the  Company's  historical  exercise 
experience  with  previously  issued  employee  and  board  of  directors'  option  grants.  The  expected  dividend  yield  is  zero  as  the 
Company has never paid dividends and does not currently have plans to do so. The risk-free interest rates are based on quoted 
U.S. Treasury rates for securities with maturities approximating the options' expected lives.  

b.  Restricted Stock Awards and Time-Based Restricted Stock Units

A  summary  of  the  Company's  activity  related  to  restricted  stock  awards  and  time-based  restricted  stock  units  (excluding 
performance-based  restricted  stock  units,  which  are  detailed  further  below)  (collectively,  "restricted  stock")  during  2023  is 
summarized below. 

Unvested as of December 31, 2022

2023: Granted

Vested

Forfeited

Unvested as of December 31, 2023

Number of 
Shares/Units
(In millions)

Weighted-
Average Grant 
Date Fair 
Value

2.6  $ 

0.8  $ 

(1.0)  $ 

(0.1)  $ 

2.3  $ 

571.19 

838.11 

458.49 

585.23 

705.37 

For the years ended December 31, 2023, 2022, and 2021, the Company recognized $475.9 million, $331.1 million, and $221.0 
million,  respectively,  of  stock-based  compensation  expense  related  to  restricted  stock  (net  of  amounts  capitalized  as  inventory, 
which  were  not  material  for  each  of  the  three  years).  As  of  December  31,  2023,  there  was  $1.023  billion  of  stock-based 

F-34

 
 
 
 
 
 
 
 
compensation cost related to unvested restricted stock which had not yet been recognized. The Company expects to recognize this 
compensation cost over a weighted-average period of 2.2 years.

c.  Performance-based Restricted Stock Units

Performance-based restricted stock units ("PSUs") have been granted to certain members of senior management of the Company. 
PSUs  may  be  earned  based  upon  the  attainment  of  pre-established  performance  criteria,  which  may  include  a  market  and/or 
performance  condition.  Depending  on  the  terms  of  the  PSUs  and  the  outcome  of  the  pre-established  performance  criteria,  a 
recipient may ultimately earn the target number of PSUs granted or a specified multiple thereof at the end of a 4–6 year vesting 
period, as applicable.

The  table  below  summarizes  activity  related  to  PSUs  during  2023.  The  number  of  unvested  PSUs  represents  the  maximum 
number of units that are eligible to be earned.

Unvested as of December 31, 2022

2023: Vested

Unvested as of December 31, 2023

Number of 
Shares/Units
(In millions)

Weighted-
Average Grant 
Date Fair 
Value

1.5  $ 

(0.1)  $ 

1.4  $ 

245.94 

198.10 

247.91 

For  each  of  the  years  ended  December  31,  2023,  2022,  and  2021  the  Company  recognized  $52.0  million  of  stock-based 
compensation  expense  related  to  PSUs.  As  of  December  31,  2023,  there  was  $104.1  million  of  stock-based  compensation  cost 
related  to  unvested  PSUs  which  had  not  yet  been  recognized.  The  Company  expects  to  recognize  this  compensation  cost  on  a 
straight-line basis over a weighted average period of 2.3 years.

Fair Value Assumptions:

The following table summarizes the weighted average values of the assumptions used in computing the fair value of PSUs that 
were granted during 2022. The Company did not grant PSUs during 2023 and 2021. 

Expected volatility

Expected dividend yield
Risk-free interest rate

2022

 32 %

 0 %
 3.3 %

14. Employee Savings Plans

The Company maintains the Regeneron Pharmaceuticals, Inc. 401(k) Savings Plan, as amended and restated (the "Savings Plan"). 
The  terms  of  the  Savings  Plan  allow  U.S.  employees  (as  defined  by  the  Savings  Plan)  to  contribute  to  the  Savings  Plan  a 
percentage of their compensation. In addition, the Company may make discretionary contributions, as defined, to the accounts of 
participants under the Savings Plan. The Company also maintains additional employee savings plans outside the United States, 
which cover eligible employees. 

Expenses recognized by the Company related to contributions to such plans were $84.7 million, $67.6 million, and $55.5 million 
for the years ended December 31, 2023, 2022, and 2021, respectively.

F-35

 
 
 
15. Income Taxes 

The Company is subject to U.S. federal, state, and foreign income taxes. Components of income before income taxes consist of 
the following: 

(In millions)

United States

Foreign

Year Ended December 31,

2023

2022

2021

$ 

$ 

(362.3)  $ 

839.9  $ 

4,561.6 

4,018.9 

4,199.3  $ 

4,858.8  $ 

5,944.7 

3,381.1 

9,325.8 

Components of income tax expense consist of the following: 

(In millions)

Current:

Federal

State

Foreign

Total current tax expense

Deferred:

Federal

State

Foreign

Year Ended December 31,

2023

2022

2021

$ 

667.9  $ 

968.5  $ 

1,429.8 

7.7 

407.9 

1,083.5 

7.4 

290.9 

1,266.8 

(834.5)   

(797.7)   

(6.5)   

3.2 

(2.7)   

54.0 

6.2 

(38.4) 

1,397.6 

(423.2) 

(0.6) 

276.7 

(147.1) 

Total deferred tax benefit

(837.8)   

(746.4)   

A reconciliation of the U.S. statutory income tax rate to the Company's effective income tax rate is as follows:

$ 

245.7  $ 

520.4  $ 

1,250.5 

U.S. federal statutory tax rate

Taxation of non-U.S. operations

Stock-based compensation
Income tax credits
Foreign-derived intangible income deduction

Other permanent differences

Effective income tax rate

Year Ended December 31,
2022

2021

2023

 21.0 %

 21.0 %

 21.0 %

 (6.6) 

 (4.6) 
 (3.2) 
 (0.3) 

 (0.4) 

 (5.5) 

 (2.9) 
 (2.0) 
 (1.0) 

 1.1 

 (2.8) 

 (2.4) 
 (1.0) 
 (1.4) 

 — 

 5.9 %

 10.7 %

 13.4 %

F-36

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities 
for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company's deferred 
tax assets and liabilities are as follows:

(In millions)

Deferred tax assets:

Capitalized research and development expenses
Deferred compensation
Accrued expenses
Fixed assets and intangible assets
Tax attribute carryforwards
Other

Total deferred tax assets

Deferred tax liabilities:

Unrealized gains on investments

Net deferred tax assets

As of December 31,

2023

2022

$ 1,728.2  $  845.3 
416.2 
235.6 
227.6 
41.3 
15.9 

413.6 
214.1 
154.8 
88.7 
26.4 

  2,625.8 

  1,781.9 

(50.4)   

(58.2) 

$ 2,575.4  $ 1,723.7 

The Company's federal income tax returns for 2017 through 2022 remain open to examination by the IRS. The Company's 2017 
and 2018 federal income tax returns are currently under audit by the IRS. In general, the Company's state income tax returns from 
2018  to  2022  remain  open  to  examination.  The  Company's  income  tax  returns  outside  the  United  States  remain  open  to 
examination from 2018 to 2022. The United States and many states generally have statutes of limitation ranging from 3 to 5 years; 
however, those statutes could be extended due to the Company's tax credit carryforward position. In general, tax authorities have 
the ability to review income tax returns in which the statute of limitation has previously expired to adjust the tax credits generated 
in those years.

The following table reconciles the beginning and ending amounts of unrecognized tax benefits: 

(In millions)
Balance as of January 1
Gross increases related to current year tax positions
Gross increases (decreases) related to prior year tax 

positions

Gross decreases due to settlements and lapse of 

statutes of limitations
Balance as of December 31

2023

2022
$  542.8  $  410.9  $  267.0 
182.3 

136.9 

153.4 

2021

3.2 

(5.0)   

2.9 

(3.0)   

(41.3) 
$  696.4  $  542.8  $  410.9 

— 

In 2023, 2022, and 2021, the increases in unrecognized tax benefits primarily related to the Company's calculation of certain tax 
credits and other items related to the Company's international operations. In 2021, the decrease in unrecognized tax benefits due to 
settlements and lapse of statutes of limitations was related to the closing of audits for the Company's federal income tax returns 
for 2015 and 2016. Interest expense related to unrecognized tax benefits was not material in 2023, 2022, and 2021. The Company 
does not believe that it is reasonably possible that the resolution of tax exposures within the next twelve months would have a 
material impact on the consolidated financial statements as of December 31, 2023.

The amount of net unrecognized tax benefits that, if settled, would impact the effective tax rate is $442.5 million, $373.7 million, 
and $321.1 million as of December 31, 2023, 2022, and 2021, respectively. 

In August 2022, the Inflation Reduction Act of 2022 ("IRA") was signed into law in the United States. The IRA created a new 
corporate alternative minimum tax of 15% on adjusted financial statement income and an excise tax of 1% of the value of certain 
stock repurchases. The provisions of the IRA became effective for periods beginning after December 31, 2022. The IRA did not 
have a material impact on the Company's financial statements as of and for the periods ended December 31, 2023 and 2022. 

F-37

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
16. Legal Matters

From time to time, the Company is a party to legal proceedings in the course of the Company's business. The outcome of any such 
proceedings, regardless of the merits, is inherently uncertain. If the Company were unable to prevail in any such proceedings, its 
consolidated financial position, results of operations, and future cash flows may be materially impacted. Costs associated with the 
Company's involvement in legal proceedings are expensed as incurred. The Company recognizes accruals for loss contingencies 
associated with such proceedings when it is probable that a liability will be incurred and the amount of loss can be reasonably 
estimated. As of December 31, 2023 and 2022, the Company's accruals for loss contingencies were not material. There are certain 
loss  contingencies  that  the  Company  deems  reasonably  possible  for  which  the  possible  loss  or  range  of  possible  loss  is  not 
estimable at this time. 

Proceedings Relating to Praluent (alirocumab) Injection

As described below, the Company is currently a party to patent infringement actions initiated by Amgen Inc. (and/or its affiliated 
entities)  against  the  Company  and/or  Sanofi  (and/or  the  Company's  and  Sanofi's  respective  affiliated  entities)  in  a  number  of 
jurisdictions  relating  to  Praluent.  In  addition,  as  described  below,  the  Company  filed  a  lawsuit  against  Amgen  alleging  that 
Amgen engaged in an anticompetitive bundling scheme which was designed to exclude Praluent from the market in violation of 
U.S. federal and state laws.

United States

In the United States, Amgen asserted claims of U.S. Patent Nos. 8,829,165 (the "'165 Patent") and 8,859,741 (the "'741 Patent"), 
and  sought  a  permanent  injunction  to  prevent  the  Company  and  the  Sanofi  defendants  from  commercial  manufacturing,  using, 
offering to sell, or selling within the United States (as well as importing into the United States) Praluent. Amgen also sought a 
judgment  of  patent  infringement  of  the  asserted  patents,  monetary  damages  (together  with  interest),  costs  and  expenses  of  the 
lawsuits, and attorneys' fees. As previously reported, on February 11, 2021, the United States Court of Appeals for the Federal 
Circuit (the "Federal Circuit") affirmed the lower court's decision that certain of Amgen's asserted patent claims are invalid based 
on lack of enablement. On April 14, 2021, Amgen filed a petition for a rehearing en banc with the Federal Circuit, which was 
denied on June 21, 2021. On November 4, 2022, the United States Supreme Court granted Amgen's petition for writ of certiorari. 
An oral hearing was held on March 27, 2023. On May 28, 2023, the United States Supreme Court affirmed the Federal Circuit's 
decision that certain of Amgen's asserted patent claims are invalid based on lack of enablement.

On May 27, 2022, the Company filed a lawsuit against Amgen in the United States District Court for the District of Delaware, 
alleging that, beginning in 2020, Amgen engaged in an anticompetitive bundling scheme which was designed to exclude Praluent 
from the market in violation of federal and state laws. The lawsuit seeks damages for harm caused by the alleged scheme, as well 
as  injunctive  relief  restraining  Amgen  from  continuing  its  alleged  anticompetitive  conduct.  On  August  1,  2022,  Amgen  filed  a 
motion to dismiss the complaint. On August 11, 2022, Amgen filed a motion to stay these proceedings pending resolution of the 
patent litigation described in the preceding paragraph. An oral hearing on Amgen's motion to dismiss and motion to stay was held 
on January 6, 2023. On February 10, 2023, the court denied Amgen's motion to stay; and on March 21, 2023, the court denied 
Amgen's  motion  to  dismiss.  On  August  28,  2023,  the  Company  filed  an  amended  complaint  in  this  matter;  and,  as  part  of  its 
response, on September 20, 2023, Amgen filed a counterclaim alleging that the Company engaged in unfair business practices in 
violation of state law. A trial has been scheduled to begin in November 2024.

F-38

Europe

Amgen  has  asserted  European  Patent  No.  2,215,124  (the  "'124  Patent"),  which  pertains  to  PCSK9  monoclonal  antibodies,  in 
certain countries in Europe. In October 2020, the '124 Patent claims directed to compositions of matter and medical use relevant 
to Praluent were ruled invalid based on a lack of inventive step by the Technical Board of Appeal (the "TBA") of the European 
Patent Office (the "EPO"). Following the EPO's decision, each of the '124 Patent infringement proceedings initiated by Amgen 
against  the  Company  and  certain  of  Sanofi's  affiliated  entities  in  these  countries  was  dismissed,  including  in  Germany.  The 
dismissal in Germany followed an earlier finding of infringement and granting of an injunction, both of which were subsequently 
overturned.  As  a  result  of  the  overturned  injunction  in  Germany,  the  Company  and/or  certain  of  Sanofi's  affiliated  entities  are 
seeking damages caused by Amgen's enforcement of the injunction. An oral hearing has been scheduled for February 28, 2024. 
As  part  of  its  opposition  to  these  damages  claims,  on  March  23,  2022,  Amgen  filed  a  counterclaim  that  asserted  the  German 
designation  of  European  Patent  No.  2,641,917  (the  "'917  Patent")  and  seeks,  among  other  things,  a  judgment  of  patent 
infringement, injunctive relief, and monetary damages. The '917 Patent is a divisional patent of the '124 Patent discussed above 
(i.e.,  a  patent  that  shares  the  same  priority  date,  disclosure,  and  patent  term  of  the  parent  '124  Patent  but  contains  claims  to  a 
different  invention).  An  oral  hearing  before  the  Munich  Regional  Court  was  held  on  November  29,  2023,  at  which  Amgen's 
counterclaim was dismissed. The '917 Patent is also subject to opposition proceedings in the EPO, which were initiated by Sanofi 
on May 5, 2021. An oral hearing before the EPO was held on February 21, 2023, at which the '917 Patent was revoked. Amgen 
filed a notice to appeal to the TBA of the EPO on February 27, 2023.

On  June  1,  2023,  Amgen  filed  a  lawsuit  against  the  Company  and  certain  of  Sanofi's  affiliated  entities  in  the  Munich  Local 
Division  of  the  Unified  Patent  Court  (the  "UPC")  alleging  infringement  of  Amgen's  European  Patent  No.  3,666,797  (the  "'797 
Patent"). The lawsuit seeks, among other things, a permanent injunction in several countries in Europe and monetary damages. 
The '797 Patent is a divisional patent of the '124 Patent discussed above. A trial has been scheduled for October 16–17, 2024. 
Also on June 1, 2023, Sanofi filed an action in the Munich Central Division of the UPC seeking revocation of the '797 Patent. A 
trial has been scheduled for June 4–5, 2024.

Proceedings Relating to EYLEA (aflibercept) Injection

Certain of the Company's patents pertaining to EYLEA are subject to post-grant proceedings before the United States Patent and 
Trademark Office ("USPTO"), EPO, or other comparable foreign authorities, including those described in greater detail below. In 
addition, the Company has filed patent infringement lawsuits in several jurisdictions alleging infringement of certain Company 
patents pertaining to EYLEA, including those described in greater detail below. 

United States

Post-Grant Proceedings Before USPTO

Company Patent(s)
U.S. Patent Nos. 
10,406,226 (the "'226 
Patent") and 
10,464,992 (the "'992 
Patent")

Challenger(s)
Anonymous 
parties

Type of Challenge

Ex parte 
reexamination

Date of Challenge
February 11, 2020

Latest Events/Current Status
On September 11, 2023, the USPTO 
dismissed the '226 Patent 
reexamination proceedings 
following the Company's filing of a 
Notice of Disclaimer, disclaiming 
all claims of the '226 Patent.

On September 8, 2023, the '992 
Patent reexamination proceedings 
were stayed by the USPTO pending 
resolution of the inter partes review 
("IPR") of the '992 Patent initiated 
by Celltrion, Inc., as discussed 
further below. On January 17, 2024, 
the Company filed a Notice of 
Disclaimer with the USPTO, 
disclaiming all claims of the '992 
Patent.

F-39

Company Patent(s) 
(continued)
U.S. Patent Nos. 
9,254,338 (the "'338 
Patent") and 
9,669,069 (the "'069 
Patent")

Challenger(s)
Mylan 
Pharmaceuticals 
Inc., joined by 
Apotex Inc. and 
Celltrion

Type of Challenge
IPR petitions seeking 
declarations of 
invalidity

Date of Challenge
May 5, 2021

U.S. Patent Nos. 
10,130,681 (the "'681 
Patent"), 10,888,601 
(the "'601 Patent"), 
and 10,857,205 (the 
"'205 Patent")

Mylan, joined 
by Celltrion 
('601 and '681 
Patents) and 
Samsung 
Bioepis Co., 
Ltd. ('601 
Patent)

IPR petitions seeking 
declarations of 
invalidity

July 1, 2022 ('681 
Patent and '601 
Patent)

October 28, 2022 
('205 Patent)

'681 Patent and '601 
Patent

U.S. Patent No. 
11,253,572 (the "'572 
Patent")

Samsung 
Bioepis, joined 
by Biocon 
Biologics Inc. 
('601 Patent)
Apotex

Samsung 
Bioepis

IPR petitions seeking 
declarations of 
invalidity

January 6, 2023 
('681 Patent)

March 26, 2023 
('601 Patent)

IPR petition seeking 
declaration of 
invalidity

IPR petition seeking 
declaration of 
invalidity

Latest Events/Current Status
On November 9, 2022, the USPTO 
issued final written decisions 
finding that the challenged claims of 
the '338 and '069 Patents are 
unpatentable and, therefore, invalid.

On January 10, 2023, the Company 
filed notices of appeal of the 
USPTO written decisions 
concerning the '338 and '069 Patents 
with the Federal Circuit.
On January 9, 2024, the USPTO 
issued final written decisions 
finding that that the challenged 
claims of the '681 and '601 Patents 
are unpatentable and, therefore, 
invalid.

On March 1, 2023, the USPTO 
denied institution of Mylan's IPR 
petition against the '205 Patent 
following the Company's filing of a 
Notice of Disclaimer with the 
USPTO, disclaiming all claims of 
the '205 Patent.
On July 19, 2023 and October 20, 
2023, the USPTO instituted IPR 
proceedings concerning the '681 
Patent and the '601 Patent, 
respectively.

September 9, 2022 On March 10, 2023, the USPTO 

April 27, 2023

January 17, 2023 
('992 Patent)

February 28, 2023 
('226 Patent)

declined to institute an IPR 
proceeding based on the Apotex IPR 
petition.
On November 17, 2023, the USPTO 
instituted IPR proceedings 
concerning the '572 Patent based on 
the Samsung IPR petition.
On July 20, 2023, the USPTO 
instituted an IPR proceeding 
concerning the '992 Patent. On 
January 17, 2024, the Company 
filed a Notice of Disclaimer with the 
USPTO, disclaiming all claims of 
the '992 Patent.

On September 1, 2023, the USPTO 
denied institution of Celltrion's IPR 
petition against the '226 Patent 
following the Company's filing of a 
Notice of Disclaimer with the 
USPTO, disclaiming all claims of 
the '226 Patent.

'992 Patent and '226 
Patent

Celltrion, joined 
by Samsung 
Bioepis ('992 
Patent)

IPR petitions seeking 
declarations of 
invalidity

F-40

U.S. Patent Litigation 

On August 2, 2022, the Company filed a patent infringement lawsuit against Mylan, a wholly-owned subsidiary of Viatris Inc., in 
the United States District Court for the Northern District of West Virginia alleging that Mylan's filing for FDA approval of an 
aflibercept 2 mg biosimilar infringes certain Company patents. On April 20, 2023, Mylan filed a motion for summary judgment or 
partial summary judgment concerning four of the asserted patents. On April 26, 2023, the Company filed a stipulation accepting 
summary  judgment  of  noninfringement  of  all  asserted  claims  of  the  Company's  U.S.  Patent  No.  11,104,715.  On  June  5,  2023, 
Biocon, as successor-in-interest to the aflibercept 2 mg biosimilar, was joined as a defendant to the lawsuit. A trial was held from 
June 12, 2023 through June 23, 2023 concerning certain claims of the '601 Patent, the '572 Patent, and the Company's U.S. Patent 
No.  11,084,865  (the  "'865  Patent").  Closing  arguments  were  presented  on  August  3,  2023.  On  December  27,  2023,  the  court 
issued a decision finding that (i) the asserted claims of the '865 Patent were valid and infringed by Mylan and (ii) the asserted 
claims of the '601 and '572 Patents were infringed by Mylan but were invalid as obvious.

On  November  8,  November  22,  and  November  29,  2023,  respectively,  the  Company  filed  patent  infringement  lawsuits  against 
Celltrion,  Samsung  Bioepis,  and  Formycon  AG  in  the  United  States  District  Court  for  the  Northern  District  of  West  Virginia 
following service on Regeneron of each company's notice of commercial marketing. The lawsuits allege that each company has 
infringed certain Company patents, including based on each company's filing for FDA approval of an aflibercept 2 mg biosimilar. 
On December 27, 2023, the Company filed a second patent infringement lawsuit against Samsung Bioepis in the United States 
District Court for the Northern District of West Virginia alleging that Samsung's filing for FDA approval of an aflibercept 2 mg 
biosimilar  infringes  certain  Company  patents.  A  preliminary  injunction  hearing  concerning  each  of  these  lawsuits  has  been 
scheduled for May 2, 2024.

On January 10, 2024, the Company filed a patent infringement lawsuit against Amgen in the United States District Court for the 
Central District of California alleging that Amgen's filing for FDA approval of an aflibercept 2 mg biosimilar infringes certain 
Company  patents.  On  January  11,  2024,  the  Company  filed  a  motion  with  the  United  States  Judicial  Panel  on  Multidistrict 
Litigation  seeking  to  transfer  this  lawsuit  to  the  United  States  District  Court  for  the  Northern  District  of  West  Virginia  for 
coordinated pretrial proceedings with the lawsuits described in the preceding paragraph. A hearing on the motion to transfer has 
been scheduled for March 28, 2024.

Europe

Post-Grant Proceedings

Authority/Court
EPO

EPO

German Federal 
Patent Court

Company 
Patent(s)

European Patent 
No. 2,944,306 (the 
"'306 Patent")
European Patent 
No. 3,716,992 (the 
"EP '992 Patent")

German 
designation of 
European Patent 
No. 2,364,691 (the 
"'691 Patent")

Challenger(s)
Anonymous 
parties

Amgen and 
three 
anonymous 
parties
Samsung 
Bioepis NL 
B.V.

Canada

Type of 
Challenge

Opposition 
proceedings

Opposition 
proceedings

Date of 
Challenge
October 26 and 
October 27, 2021

Latest Events/
Current Status
Oral hearing to be 
scheduled.

May 5-10, 2023

Oral hearing to be 
scheduled.

Invalidation 
proceedings

June 22, 2023

Trial has been 
scheduled to begin in 
June 2025.

On  June  15,  July  15,  August  30,  and  October  4,  2022,  the  Company  and  Bayer  Inc.  filed  patent  infringement  lawsuits  against 
BGP Pharma ULC d.b.a Viatris Canada ("Viatris Canada") in the Federal Court of Canada seeking a declaration that the making, 
constructing, using, or selling of an aflibercept 2 mg biosimilar would directly or indirectly infringe one or more claims of the 
Company's Canadian Patent Nos. 2,654,510 (the "'510 Patent") and 3,007,276 (the "'276 Patent") (in the lawsuit filed on June 15, 
2022); the Company's Canadian Patent No. 2,965,495 (the "'495 Patent") (in the lawsuit filed on July 15, 2022); the Company's 
Canadian  Patent  No.  2,906,768  (the  "'768  Patent")  (in  the  lawsuit  filed  on  August  30,  2022,  which  has  been  joined  with  the 
lawsuit  filed  on  July  15,  2022);  and  the  Company's  Canadian  Patent  No.  3,129,193  (the  "'193  Patent")  (in  the  lawsuit  filed  on 
October 4, 2022). A trial for the lawsuit concerning the '510 Patent and the '276 Patent (the "Viatris Canada 510/276 Lawsuit") 
has been scheduled for March 2024; a trial for the lawsuit concerning the '193 Patent has been scheduled for May 2024; and a trial 
for the lawsuit concerning the '495 Patent and the '768 Patent has been scheduled for November/December 2024. The filing of the 
Viatris Canada 510/276 Lawsuit resulted in a statutory 24-month stay of regulatory approval of Viatris Canada's aflibercept 2 mg 

F-41

biosimilar in Canada unless the lawsuit is resolved earlier. On March 27, 2023, in light of the transfer of Viatris Canada's New 
Drug Submission ("NDS") of its aflibercept 2 mg biosimilar to Biosimilar Collaborations Ireland Limited ("BCIL"), the Company 
filed a motion in the Federal Court of Canada seeking termination of the Viatris Canada 510/276 Lawsuit. On June 5, 2023, BCIL 
was added as a defendant in the Viatris Canada 510/276 Lawsuit.

On  March  23,  2023  and  June  14,  2023,  the  Company  and  Bayer  Inc.  filed  patent  infringement  lawsuits  against  BCIL  in  the 
Federal Court of Canada seeking a declaration that the making, constructing, using, or selling of an aflibercept 2 mg biosimilar 
would directly or indirectly infringe one or more claims of the Company's '510 and '276 Patents. The June 14, 2023 lawsuit was 
filed after BCIL served Bayer Inc. with a statutory notification in relation to the NDS on May 23, 2023. On September 14, 2023, 
the Company, Bayer Inc., and Bayer Healthcare LLC filed patent infringement lawsuits against Viatris Canada and BCIL in the 
Federal Court of Canada seeking a declaration that the making, constructing, using, or selling of an aflibercept 2 mg biosimilar 
would  directly  or  indirectly  infringe  one  or  more  claims  of  Bayer  Healthcare  LLC's  Canadian  Patent  No.  2,970,315  (the  "'315 
Patent"). 

On May 9, 2023, Amgen Canada Inc. ("Amgen Canada") filed invalidation proceedings against the Company in the Federal Court 
of Canada seeking revocation of the '510 Patent and the '276 Patent. On September 14, 2023, the Company, Bayer Inc., and Bayer 
Healthcare LLC filed patent infringement lawsuits against Amgen Canada in the Federal Court of Canada seeking a declaration 
that the making, constructing, using, or selling of an aflibercept 2 mg biosimilar would directly or indirectly infringe one or more 
claims of the '315 Patent. On September 14, 2023, the Company and Bayer Inc. filed three separate patent infringement lawsuits 
against Amgen Canada in the Federal Court of Canada seeking a declaration that the making, constructing, using, or selling of an 
aflibercept 2 mg biosimilar would directly or indirectly infringe one or more claims of the Company's '193 Patent, '495 Patent, 
and  '768  Patent,  respectively.  On  October  11,  2023,  the  Company,  Bayer  Inc.,  and  Bayer  Healthcare  LLC  filed  two  separate 
patent  infringement  lawsuits  against  Amgen  Canada  in  the  Federal  Court  of  Canada  seeking  a  declaration  that  the  making, 
constructing, using, or selling of an aflibercept 2 mg biosimilar would directly or indirectly infringe one or more claims of the 
Company's '510 Patent and '276 Patent, respectively. A trial for the lawsuits concerning the '510 Patent and the '276 Patent has 
been scheduled for May 2025.

On January 15, 2024, the Company and Bayer Inc. filed patent infringement lawsuits against Celltrion, Inc., Celltrion Healthcare 
Co, Ltd., Celltrion Pharma Inc., and Celltrion Healthcare Canada Ltd. in the Federal Court of Canada seeking a declaration that 
the  making,  constructing,  using,  or  selling  of  an  aflibercept  2  mg  biosimilar  would  directly  or  indirectly  infringe  one  or  more 
claims of the '510 Patent, the '276 Patent, the '495 Patent, the '768 Patent, the '193 Patent, and the '315 Patent.

South Korea

On October 31, 2022 and December 13, 2022, Samsung Bioepis Co., Ltd. initiated invalidation proceedings before the Intellectual 
Property Trial	and Appeal Board of the Korean Intellectual Property Office against the Company's Korean Patent Nos. 1131429 
and 1406811, respectively, seeking revocation of each of such patents in its entirety.

On January 16, 2023, the Company filed patent infringement lawsuits against Samsung Bioepis Co., Ltd. and its parent company 
Samsung Biologics Co., Ltd. before the Seoul Central District Court seeking a declaration that the making, constructing, using, or 
selling  of  an  aflibercept  2  mg  biosimilar  would  infringe  one  or  more  claims  of  the  Company's  Korean  Patent  No.  659477  (the 
"'477 Patent"). On July 20, 2023, the Company filed a preliminary injunction petition against Samsung Bioepis Co., Ltd. and its 
parent  company  Samsung  Biologics  Co.,  Ltd.  before  the  Seoul  Central  District  Court  seeking  a  court  order  enjoining  the 
manufacture, use, and assignment of an aflibercept 2 mg biosimilar that infringes one or more claims of the '477 Patent; and on 
December 20, 2023, the Seoul Central District Court granted a preliminary injunction. On January 10, 2024, the injunction was 
lifted against the Samsung entities following the expiration of the '477 Patent.

On  March  2,  2023,  the  Company  filed  an  affirmative  scope  confirmation  action  against  Samsung  Bioepis  Co.,  Ltd.  before  the 
Intellectual  Property  Tribunal  and  Appeal  Board  of  the  Korean  Intellectual  Property  Office  seeking  a  ruling  that  Samsung 
Bioepis's aflibercept 2 mg biosimilar is covered by the claims of the '477 Patent. On March 7, 2023, the action was designated for 
expedited proceedings.

Proceedings Relating to EYLEA (aflibercept) Injection Pre-filled Syringe

On  June  19,  2020,  Novartis  Pharma  AG,  Novartis  Pharmaceuticals  Corporation,  and  Novartis  Technology  LLC  (collectively, 
"Novartis") filed a patent infringement lawsuit (as amended on August 2, 2021) in the U.S. District Court for the Northern District 
of New York asserting claims of Novartis's U.S. Patent No. 9,220,631 (the "'631 Patent") and seeking preliminary and permanent 
injunctions  to  prevent  the  Company  from  continuing  to  infringe  the  '631  Patent.  Novartis  also  seeks  a  judgment  of  patent 
infringement  of  the  '631  Patent,  monetary  damages  (together  with  interest),  an  order  of  willful  infringement  of  the  '631  Patent 
(which would allow the court in its discretion to award damages up to three times the amount assessed), costs and expenses of the 

F-42

lawsuits, and attorneys' fees. On November 7, 2022, the Company and Novartis entered into a stipulation staying the lawsuit in 
light of the decision in the IPR proceeding discussed below.

On July 16, 2020, the Company initiated two IPR petitions in the USPTO seeking a declaration of invalidity of the '631 Patent on 
two separate grounds. On October 26, 2021, the USPTO issued a decision instituting the IPR proceeding. An oral hearing was 
held on July 21, 2022. On October 25, 2022, the Patent Trial and Appeal Board ("PTAB") of the USPTO issued a final written 
decision  invalidating  all  claims  of  the  '631  Patent.  On  December  23,  2022,  Novartis  filed  a  notice  of  appeal  of  the  PTAB's 
decision to the Federal Circuit. 

On July 17, 2020, the Company filed an antitrust lawsuit against Novartis and Vetter Pharma International Gmbh ("Vetter") in the 
United States District Court for the Southern District of New York seeking a declaration that the '631 Patent is unenforceable and 
a  judgment  that  the  defendants'  conduct  violates  Sections  1  and  2  of  the  Sherman  Antitrust  Act  of  1890,  as  amended  (the 
"Sherman  Antitrust  Act").  The  Company  is  also  seeking  injunctive  relief  and  treble  damages.  On  September  4,  2020,  Novartis 
filed, and Vetter moved to join, a motion to dismiss the complaint, to transfer the lawsuit to the Northern District of New York, or 
to stay the suit; and on October 19, 2020, Novartis filed, and Vetter moved to join, a second motion to dismiss the complaint on 
different  grounds.  On  January  25,  2021,  the  Company  filed  an  amended  complaint  seeking  a  judgment  that  Novartis's  conduct 
violates Section 2 of the Sherman Antitrust Act based on additional grounds, as well as a judgment of tortious interference with 
contract.  On  February  22,  2021,  Novartis  filed,  and  Vetter  moved  to  join,  a  motion  to  dismiss  the  amended  complaint.  On 
September 21, 2021, the court granted Novartis and Vetter's motion to transfer this lawsuit to the Northern District of New York. 
As  a  result,  this  lawsuit  was  transferred  to  the  same  judge  that  had  been  assigned  to  the  patent  infringement  lawsuit  discussed 
above.  On  November  5,  2021,  the  Company  filed  a  motion  to  stay  these  proceedings  in  light  of  the  pending  IPR  proceeding 
discussed above. On January 31, 2022, the court denied the Company's motion to stay these proceedings and granted Novartis and 
Vetter's motion to dismiss the amended complaint. On June 10, 2022, the Company filed an appeal of the District Court's decision 
to dismiss the amended complaint with the U.S. Court of Appeals for the Second Circuit. An oral hearing before the U.S. Court of 
Appeals for the Second Circuit was held on October 11, 2023.

Proceedings Relating to REGEN-COV (casirivimab and imdevimab)

On October 5, 2020, Allele Biotechnology and Pharmaceuticals, Inc. ("Allele") filed a lawsuit (as amended on April 8, 2021 and 
December 12, 2022) against the Company in the United States District Court for the Southern District of New York, asserting 
infringement of U.S. Patent No. 10,221,221 (the "'221 Patent"). Allele seeks a judgment of patent infringement of the '221 Patent, 
an award of monetary damages (together with interest), an order of willful infringement of the '221 Patent (which would allow the 
court in its discretion to award damages up to three times the amount assessed), costs and expenses of the lawsuit, and attorneys' 
fees. On July 16, 2021, the Company filed a motion to dismiss the complaint, which motion was denied on March 2, 2022. On 
September  18,  2023,  the  parties  entered  into  a  stipulation  that  narrowed  the  case  to  (i)  whether  any  safe  harbor  defense  under 
federal law applies to Regeneron's use of the invention covered, based on the court's claim construction, by the '221 Patent; (ii) 
damages for any use by Regeneron found to not be covered by such safe harbor defense; and (iii) whether any use referred to in 
clause (ii) above was willful.

Department of Justice Matters

In January 2017, the Company received a subpoena from the U.S. Attorney's Office for the District of Massachusetts requesting 
documents relating to its support of 501(c)(3) organizations that provide financial assistance to patients; documents concerning its 
provision of financial assistance to patients with respect to products sold or developed by Regeneron (including EYLEA, Praluent, 
ARCALYST, and ZALTRAP®); and certain other related documents and communications. On June 24, 2020, the U.S. Attorney's 
Office for the District of Massachusetts filed a civil complaint in the U.S. District Court for the District of Massachusetts alleging 
violations of the federal Anti-Kickback Statute, and asserting causes of action under the federal False Claims Act and state law. 
On August 24, 2020, the Company filed a motion to dismiss the complaint in its entirety. On December 4, 2020, the court denied 
the  motion  to  dismiss.  On  December  28,  2022,  the  U.S.  Attorney’s  Office  for  the  District  of  Massachusetts  filed  a  motion  for 
partial  summary  judgment.  On  January  31,  2023,  the  Company  filed  a  motion  for  summary  judgment.  An  oral  hearing  on  the 
parties' respective motions for summary judgment was held on July 21, 2023. On September 27, 2023, the court (i) denied in part 
and granted in part the Company's motion for summary judgment and (ii) denied in its entirety the motion for partial summary 
judgment  filed  by  the  U.S.  Attorney's  Office  for  the  District  of  Massachusetts.  On  October  25,  2023,  the  court  certified  for 
interlocutory  appeal  a  portion  of  the  court's  September  27,  2023  order  that  addressed  the  causation  standard  applicable  to  the 
alleged violations of the federal Anti-Kickback Statute and federal False Claims Act; and on December 11, 2023, the U.S. Court 
of Appeals for the First Circuit certified for appeal the court's September 27, 2023 order. 

In September 2019, the Company and Regeneron Healthcare Solutions, Inc., a wholly-owned subsidiary of the Company, each 
received  a  civil  investigative  demand  ("CID")  from  the  U.S.  Department  of  Justice  pursuant  to  the  federal  False  Claims  Act 
relating  to  remuneration  paid  to  physicians  in  the  form  of  consulting  fees,  advisory  boards,  speaker  fees,  and  payment  or 
reimbursement  for  travel  and  entertainment  allegedly  in  violation  of  the  federal  Anti-Kickback  Statute.  The  CIDs  relate  to 

F-43

EYLEA, Praluent, Dupixent, ZALTRAP, ARCALYST, and Kevzara and cover the period from January 2015 to the present. On 
June 3, 2021, the United States District Court for the Central District of California unsealed a qui tam complaint filed against the 
Company,  Regeneron  Healthcare  Solutions,  Inc.,  and  Sanofi-Aventis  U.S.  LLC  by  two  qui  tam  plaintiffs  (known  as  relators) 
purportedly on behalf of the United States and various states (the "State Plaintiffs"), asserting causes of action under the federal 
False Claims Act and state law. Also on June 3, 2021, the United States and the State Plaintiffs notified the court of their decision 
to  decline  to  intervene  in  the  case.  On  October  29,  2021,  the  qui  tam  plaintiffs  filed  an  amended  complaint  in  this  matter.  On 
January 14, 2022, the Company filed a motion to dismiss the amended complaint in its entirety. On July 25, 2023, the court in part 
granted  and  in  part  denied  the  Company's  motion  to  dismiss.  On  September  1,  2023,  the  Company  filed  a  second  motion  to 
dismiss the amended complaint or, in the alternative, a motion for judgment on the pleadings. A trial has been scheduled for April 
2025.

In June 2021, the Company received a CID from the U.S. Department of Justice pursuant to the federal False Claims Act. The 
CID states that the investigation concerns allegations that the Company (i) violated the False Claims Act by paying kickbacks to 
distributors  and  ophthalmology  practices  to  induce  purchase  of  EYLEA,  including  through  discounts,  rebates,  credit  card  fees, 
free  units  of  EYLEA,  and  inventory  management  systems;  and  (ii)  inflated  reimbursement  rates  for  EYLEA  by  excluding 
applicable discounts, rebates, and benefits from the average sales price reported to the Centers for Medicare & Medicaid Services. 
The  CID  covers  the  period  from  January  2011  through  June  2021.  The  Company  is  cooperating  with  this  investigation.  On 
November 29, 2023, the U.S. Department of Justice informed the Company that it had filed a notice of partial intervention in this 
matter.

California Department of Insurance Subpoena

In September 2022, the Company received a subpoena from the Insurance Commissioner for the State of California pursuant to 
the  California  Insurance  Code.  The  subpoena  seeks  information  relating  to  the  marketing,  sale,  and  distribution  of  EYLEA, 
including  (i)  discounts,  rebates,  credit  card  fees,  and  inventory  management  systems;  (ii)  Regeneron's  relationships  with 
distributors; (iii) price reporting; (iv) speaker programs; and (v) patient support programs. The subpoena covers the period from 
January 1, 2014 through August 1, 2021. The Company is cooperating with this investigation.

Proceedings Initiated by Other Payors Relating to Patient Assistance Organization Support

The Company is party to several lawsuits relating to the conduct alleged in the civil complaint filed by the U.S. Attorney's Office 
for  the  District  of  Massachusetts  discussed  under  "Department  of  Justice  Matters"  above.  These  lawsuits  were  filed  by 
UnitedHealthcare Insurance Company and United Healthcare Services, Inc. (collectively, "UHC") and Humana Inc. ("Humana") 
in the United States District Court for the Southern District of New York on December 17, 2020 and July 22, 2021, respectively; 
and  by  Blue  Cross  and  Blue  Shield  of  Massachusetts,  Inc.  and  Blue  Cross  and  Blue  Shield  of  Massachusetts  HMO  Blue,  Inc. 
(collectively,  "BCBS"),  Medical  Mutual  of  Ohio  ("MMO"),  Horizon  Healthcare  Services,  Inc.  d/b/a  Horizon  Blue  Cross  Blue 
Shield of New Jersey ("Horizon"), and Local 464A United Food and Commercial Workers Union Welfare Service Benefit Fund 
("Local 464A") in the U.S. District Court for the District of Massachusetts on December 20, 2021, February 23, 2022, April 4, 
2022, and June 17, 2022, respectively. These lawsuits allege causes of action under state law and the federal Racketeer Influenced 
and Corrupt Organizations Act and seek monetary damages and equitable relief. The MMO and Local 464A lawsuits are putative 
class action lawsuits. On December 29, 2021, the lawsuits filed by UHC and Humana were stayed by the United States District 
Court for the Southern District of New York pending resolution of the proceedings before the U.S. District Court for the District 
of Massachusetts discussed under "Department of Justice Matters" above. On September 27, 2022, the lawsuits filed by BCBS, 
MMO, and Horizon were stayed by the U.S. District Court for the District of Massachusetts pending resolution of the proceedings 
before the same court discussed under "Department of Justice Matters" above; and, in light of these stays, the parties to the Local 
464A action have also agreed to stay that matter.

F-44

Proceedings Relating to Shareholder Derivative Complaint

On June 29, 2021, an alleged shareholder filed a shareholder derivative complaint in the New York Supreme Court, naming the 
current and certain former members of the Company's board of directors and certain current and former executive officers of the 
Company  as  defendants  and  Regeneron  as  a  nominal  defendant.  The  complaint  asserts  that  the  individual  defendants  breached 
their  fiduciary  duties  in  relation  to  the  allegations  in  the  civil  complaint  filed  by  the  U.S.  Attorney's  Office  for  the  District  of 
Massachusetts  discussed  under  "Department  of  Justice  Matters"  above.  The  complaint  seeks  an  award  of  damages  allegedly 
sustained  by  the  Company;  an  order  requiring  Regeneron  to  take  all  necessary  actions  to  reform  and  improve  its  corporate 
governance  and  internal  procedures;  disgorgement  from  the  individual  defendants  of  all  profits  and  benefits  obtained  by  them 
resulting from their sales of Regeneron stock; and costs and disbursements of the action, including attorneys' fees. On July 28, 
2021, the defendants filed a notice of removal, removing the case from the New York Supreme Court to the U.S. District Court 
for the Southern District of New York. On September 23, 2021, the plaintiff moved to remand the case to the New York Supreme 
Court. Also on September 23, 2021, the individual defendants moved to dismiss the complaint in its entirety. On December 19, 
2022, the U.S. District Court for the Southern District of New York denied the plaintiff's motion to remand the case and granted a 
motion  to  stay  the  case  pending  resolution  of  the  proceedings  before  the  U.S.  District  Court  for  the  District  of  Massachusetts 
discussed under "Department of Justice Matters" above. As a result of the stay, the court also terminated the Company's motion to 
dismiss the complaint without prejudice. The Company can therefore renew the motion to dismiss upon conclusion of the stay. 

17. Net Income Per Share 

The calculations of basic and diluted net income per share are as follows:

(In millions, except per share data)

Net income - basic and diluted

Weighted average shares - basic

Effect of dilutive securities:

Stock options

Restricted stock awards and restricted stock units

Weighted average shares - diluted

Year Ended December 31,
2022

2021

2023

$  3,953.6  $  4,338.4  $  8,075.3 

106.7 

107.1 

105.7 

4.9 

2.1 

4.9 

1.5 

5.4 

1.1 

113.7 

113.5 

112.2 

Net income per share - basic

Net income per share - diluted

$ 

$ 

37.05  $ 

40.51  $ 

34.77  $ 

38.22  $ 

76.40 

71.97 

Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive include the 
following:

(Shares in millions)

Stock options

Year Ended December 31,
2021
2022
2023

1.8 

2.3 

2.9 

F-45

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
18. Statement of Cash Flows

The following provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance 
Sheet to the total of the same such amounts shown in the Consolidated Statement of Cash Flows:

(In millions)

Cash and cash equivalents
Restricted cash included in Other 

noncurrent assets

Total cash, cash equivalents, and restricted 

cash shown in the Consolidated Statement 
of Cash Flows

December 31,
2022

2023

2021

$  2,730.0  $  3,105.9  $  2,885.6 

7.8 

13.5 

12.5 

$  2,737.8  $  3,119.4  $  2,898.1 

Restricted cash consists of amounts held by financial institutions pursuant to contractual arrangements.

Supplemental disclosure of non-cash investing and financing activities

(In millions)

2023

As of December 31,
2022

2021

Accrued capital expenditures
Accrued contingent consideration in 

connection with acquisitions

$ 

$ 

75.4  $ 

70.8  $ 

71.6  $ 

135.5  $ 

74.8 

— 

F-46

 
 
 
DIRECTORS

Bonnie L. Bassler, Ph.D.
Chair of the Department of Molecular 
Biology and Squibb Professor in Molecular 
Biology at Princeton University

Michael S. Brown, M.D.
Regental Professor of Molecular Genetics 
and Internal Medicine and Director of the 
Jonsson Center for Molecular Genetics 
at The University of Texas Southwestern 
Medical Center at Dallas

N. Anthony Coles, M.D.
Chair of the Board and former Chief 
Executive Officer of Cerevel Therapeutics 
Holdings, Inc., the parent entity of Cerevel 
Therapeutics, Inc.

Joseph L. Goldstein, M.D.
Regental Professor of Molecular Genetics 
and Internal Medicine and the Chair of the 
Department of Molecular Genetics at the 
University of Texas Southwestern Medical 
Center at Dallas

Kathryn Guarini, Ph.D.
Former Chief Information Officer of IBM

George L. Sing
Chief Executive Officer of GanD, Inc. and Chair  
of Grace Science, LLC

Christine A. Poon
Former Vice Chair and Worldwide Chair of 
Pharmaceuticals at Johnson & Johnson

Arthur F. Ryan
Former Chief Executive Officer and Chair of 
the Board of Prudential Financial, Inc.

David P. Schenkein, M.D.
General Partner and co-Lead of Life Sciences 
at GV (formerly Google Ventures)

Leonard S. Schleifer, M.D., Ph.D.
Board co-Chair, President and Chief Executive 
Officer of Regeneron Pharmaceuticals, Inc.

Craig B. Thompson, M.D.
Former President and Chief Executive Officer of 
Memorial Sloan Kettering  
Cancer Center

George D. Yancopoulos, M.D., Ph.D.
Board co-Chair, President and Chief Scientific 
Officer of Regeneron Pharmaceuticals, Inc.

Huda Y. Zoghbi, M.D.
Professor in the Departments of Pediatrics, 
Molecular and Human Genetics, and Neurology 
and Neuroscience at Baylor College of Medicine

EXECUTIVE OFFICERS

Leonard S. Schleifer, M.D., Ph.D.
Board co-Chair, President and Chief  
Executive Officer

Joseph J. LaRosa
Executive Vice President, General  
Counsel and Secretary

Jason Pitofsky
Vice President, Controller

George D. Yancopoulos, M.D., Ph.D.
Board co-Chair, President and Chief  
Scientific Officer

Marion McCourt
Executive Vice President, Commercial

Neil Stahl, Ph.D.
Executive Vice President, Research 
and Development

Christopher Fenimore
Senior Vice President, Finance and  
Chief Financial Officer

Andrew J. Murphy, Ph.D.
Executive Vice President, Research

Daniel P. Van Plew
Executive Vice President and General 
Manager, Industrial Operations and  
Product Supply

CORPORATE INFORMATION

Common Stock and Related Matters
Our Common Stock is traded on The NASDAQ Global Select Market under the symbol “REGN.” Our Class A Stock is not 
publicly quoted or traded.

Shareholders’ Inquiries
Inquiries relating to stock transfer or lost certificates and notices of changes of address should be directed to our  
Transfer Agent, Equiniti Trust Company, LLC, 55 Challenger Road, Floor 2, Ridgefield Park, NJ 07660, (800)-937-5449,  
www equiniti com. General information regarding the Company, recent press releases, and filings with the U.S. Securities 
and Exchange Commission are available on our website at www regeneron com, or can be obtained by contacting our 
Investor Relations Department at (914) 847-7741 or invest@regeneron com.

Transfer Agent & Registrar
Equiniti Trust Company, LLC
55 Challenger Road, Floor 2
Ridgefield Park, NJ 07660

Corporate Office
777 Old Saw Mill River Road
Tarrytown, New York 10591-6707
(914) 847-7000

Annual Meeting
The 2024 Annual Meeting of 
Shareholders will be held virtually  
via the Internet at  
www virtualshareholdermeeting com/ 
REGN2024 on June 14, 2024 at  
10:30 a.m., Eastern Time.

Independent Registered Public Accounting Firm
PricewaterhouseCoopers LLP