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Repligen

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FY2007 Annual Report · Repligen
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2007

ANNUAL REPORT

TO OUR SHAREHOLDERS: Our goal is to develop and commercialize novel products for  

the treatment of Central Nervous System (CNS) disorders. We have a three-step strategy to 

achieve our goal:

First, we will seek to increase the profits from 

We expect continued growth in product  

the sale of our existing products to provide  

sales in the next year, progress on realizing 

a source of funding for the acquisition and 

the value of our patents and strengthening  

development of our CNS product candidates.

of our therapeutic pipeline through develop-

Second, we intend to vigorously enforce our 

patent rights which may provide additional cap-

ital for investment in our product candidates.

Third, we will seek to strengthen our product 

pipeline through development of our existing 

ment of our existing product candidates and, 

potential in-licensing of additional CNS prod-

uct candidates.

I look forward to keeping you informed of  

our progress.

product candidates and through in-licensing  

Sincerely,

of new product candidates which can be eval-

uated clinically without “betting the company” 

on any single product.

Walter C. Herlihy, Ph.D.
President and CEO

During the past year we have made significant 

July 8, 2007

progress on each of these goals. Increased 

sales and profits from our products, progress 

in enforcing our patent rights and the acquisi-

tion of a new product development candidate 

are evidence of our success.

OUR MISSION

OUR STRATEGY

Repligen’s mission is to develop novel therapeu-

To achieve our goal we plan to make significant 

tics for CNS disorders for which there is signifi-

investments in product development. Our efforts 

cant unmet medical need. We intend to build a 

will be partially funded from the profits from our 

sustainable franchise focused on meeting the 

current products and any future cash streams we 

needs of patients and care providers in several 

may realize from the licensing of our patents. We 

CNS disorders.

plan to out-license any product candidates which 

may have utility in therapeutic categories other 

than CNS. Cash provided by these activities will 

make us less dependent on the sale of equity to 

fund our operations. In addition, our commercial 

products business enables us to gain valuable 

expertise in manufacturing and marketing prior  

to the commercialization of our CNS product  

candidates. We believe that a clear focus on a 

single therapeutic category will enable us to  

benefit from synergies in research, product  

development and commercialization.

CORPORATE MILESTONES
This year we achieved important milestones toward  

building a self-sustaining, integrated biopharmaceutical company.

1.0

MARKETED PRODUCTS

Our revenues grew to $14.1 million consisting primarily of sales of our Protein A products.

We completed the construction of a multi-thousand liter fermentation facility  

which increases our capacity to manufacture our Protein A products.

2.0

INTELLECTUAL PROPERTY

We received Summary Judgement in our favor in the ongoing litigation against ImClone Systems, Inc. 
based on the manufacture and sale of Erbitux®. The trial is currently scheduled for September 2007.

A trial date of April 2008 is currently scheduled for our lawsuit against Bristol-Myers Squibb for  

infringement of our patent covering the use of CTLA4-Ig to treat rheumatoid arthritis.

3.0

PRODUCT PIPELINE

We completed a positive Phase 2 clinical trial to evaluate the use of secretin to improve the  

diagnostic quality of an MRI image of the pancreas. We also received Orphan Drug Designation for this 

use which qualifies us for seven years of marketing exclusivity if we are the first to the market.

Completed enrollment in a Phase 2a clinical trial of an oral formulation  

of uridine to treat bipolar depression.

We licensed rights to intellectual property covering compounds which may have utility  

in treating Friedreich’s ataxia.

OUR ASSETS

Over the past year our marketed products have continued to provide a growing stream of revenue and profits, 

allowing us to invest in our patents and the development of our pipeline without the financial risks normally 

associated with a clinical stage biotechnology company.

PRODUCT PIPELINE

MARKETED PRODUCTS

PRECLINICAL

PHASE I

PHASE II

PHASE III

MARKET

Protein A
Antibody Purification

SecreFlo®
GI Diagnosis

INTELLECTUAL PROPERTY

Erbitux®
Colon, Head and Neck Cancer

Orencia®
Rheumatoid Arthritis

PRODUCT PIPELINE

Secretin
Pancreatic MRI

Uridine
Bipolar Depression

Other Neurology

Transcription Activators
Friedreich’s Ataxia

Erbitux ® and Orencia® are registered trademarks of ImClone Systems, Inc. and Bristol-Myers Squibb, respectively.

15

10

5

0

0

-2

-4

-6

-8

30

20

10

0

TOTAL REVENUE
(dollars in millions)

OPERATING LOSS
(dollars in millions)

CASH & INVESTMENTS
(dollars in millions)

14.1

$15

10

5

0

$0

(2)

(4)

(6)

(8)

(1.8)

$30

20

10

0

22.6

2005

2006

2007

2005

2006

2007

2005

2006

2007

REPLIGEN CORPORATION

1.0 MARKETED PRODUCTS

2.0 INTELLECTUAL PROPERTY

MARKETED PRODUCTS

“Enhancer” Patent

Repligen is the world’s leading supplier of recombinant 

Protein A, a consumable used in the production of the vast 

majority of monoclonal antibodies. Protein A’s unique and 

broadly applicable properties provide a powerful purification 

tool resulting in lower costs for manufacturers. There are 

currently 18 monoclonal antibodies that have received reg-

ulatory approval with more than 150 products in develop-

ment. Monoclonal antibodies are the largest and fastest 

growing class of drug in the biopharmaceutical industry 

with revenues forecast to exceed $30 billion in 2010. Last 

year we recorded $11.1 million from sales of our Protein A 

P.2

products and we anticipate demand will continue to grow 

along with the growth of the monoclonal antibody market.

INTELLECTUAL PROPERTY

Repligen has a long history of scientific innovation which 

has been recognized by the receipt of many patents. We 

have rights to patents on two products: Erbitux®, approved 

for treatment of colorectal and head and neck cancer and 

Orencia® (CTLA4-Ig), approved for treatment of rheuma-

toid arthritis.

Repligen and MIT own rights to a U.S. patent, which covers 

certain genetic elements that increase protein production in 

a mammalian cell. Repligen and MIT filed an action against 

ImClone for infringement of this patent based on ImClone’s 

manufacture and sale of Erbitux®. In the complaint we 

allege that the cell line that ImClone uses to produce 

Erbitux® employs a key technology that is claimed in the 

patent. The Court issued a ruling on Summary Judgement  

in our favor and rejected ImClone’s previously asserted 

defense of patent exhaustion, eliminating this argument  

as a potential defense for ImClone at trial. Recently, the 

Court imposed sanctions on ImClone for misconduct by  

its attorneys. The trial is currently set for September 2007. 

ImClone has reported approximately $1.5 billion in sales  

to date of Erbitux® in the U.S.

CTLA4-Ig Patent

In the 1990s our collaborators at the University of Michigan 

and the U.S. Navy demonstrated that CTLA4-Ig, one of  

the immune system’s natural “off switches,” could be used 

to treat certain autoimmune diseases in animal models. 

Repligen owns the exclusive rights to a U.S. patent that 

covers a method of treating rheumatoid arthritis with 

CTLA4-Ig that will remain in force until 2021. CTLA4-Ig’s 

mechanism of action is different from current therapies for 

2007 ANNUAL REPORT

3.0 PRODUCT PIPELINE

arthritis and may provide a treatment for patients refractory 

showed highly significant increases in physician confidence 

to existing therapies.

In 2005, Bristol-Myers Squibb received FDA approval to 

market CTLA4-Ig for treatment of rheumatoid arthritis, 

under the brand name Orencia®. Subsequently, we filed  

a lawsuit against Bristol for infringement of our patent.  

Our goal is to license our patent to Bristol in exchange for 

royalties whether through a court action or a negotiated 

to identify structural abnormalities, the number of pancre-

atic duct segments visualized and improvements in the 

overall image quality. Detailed assessment of the pancre-

atic ducts is important in the diagnosis and treatment of 

acute and chronic pancreatitis. There may be more than 

100,000 MRI images in the U.S. each year that could bene-

fit from the use of secretin.

settlement. Analysts expect the annual sales of Orencia®  

The Office of Orphan Products Development of the FDA 

to reach $1 billion within five years. A trial date is currently 

granted us orphan drug designation for the use of secretin 

set for April 2008.

PRODUCT PIPELINE

Secretin for Imaging of the Pancreas

The literature supports the use of secretin with abdominal 

MRI imaging to improve visualization of the pancreas and  

with MRI imaging, which qualifies us for seven years of 

marketing exclusivity in the U.S. if we are the first to 

receive marketing approval. We are in the process of defin-

P.3

ing the registration path with the FDA. We are also con-

ducting a pilot study to evaluate the use of secretin in 

abdominal imaging to assess the function of the pancreas.

to increase diagnostic sensitivity. The use of MRI is attrac-

Uridine for Bipolar Depression

tive for patient care as it can obviate the need for more 

Uridine is a biological compound essential for the synthesis 

risky invasive procedures. We have completed a positive 

of DNA, RNA and numerous other factors essential for  

Phase 2 clinical trial to evaluate the use of secretin with 

cell metabolism. Uridine is synthesized by the power plant 

MRI to improve imaging of the pancreas. The study showed 

of the human cell known as the mitochondria. Research 

improved sensitivity to detect structural abnormalities of 

indicates that mitochondrial dysfunction is involved in bipo-

the pancreatic duct of approximately 20% with no loss  

lar disorder, which suggests that uridine may be useful in 

in specificity, consistent with prior data. The study also  

this disease.

REPLIGEN CORPORATION

We are conducting a Phase 2 clinical trial of uridine in bipo-

no treatment for Friedreich’s ataxia, which affects approxi-

lar disorder to assess the impact on the depressive symp-

mately one in every 50,000 people in the U.S.

toms of the disease. We have completed enrollment in this 

study in which approximately 80 patients received uridine 

or a placebo for 6 weeks and we expect to have trial results 

in the fall. Bipolar disorder is an illness marked by extreme 

changes in mood, energy and behavior in which a person 

can alternate between states of mania and depression. More 

than 2 million adults in the U.S. have bipolar disorder. The 

Stanley Medical Research Institute, the largest nonprofit 

provider of funding for research on schizophrenia and bipo-

Research conducted in tissue samples from patients as 

well as in mice indicates that these compounds increase 

production of the protein frataxin, which suggests potential 

utility in slowing or stopping progression of the disease. 

Preliminary data also suggests that these compounds  

may have utility in treating other disorders such as spinal 

muscular atrophy and Huntington’s disease. We are work-

ing to identify a drug candidate for the clinic.

lar disorder in the U.S., has provided support for this study.

Finances and Business Strategy

P.4

Transcription Activators for Friedreich’s Ataxia

Consistent with our goal for last year to expand our pipe-

line, we licensed rights to intellectual property covering 

compounds which may have utility in treating Friedreich’s 

ataxia. Friedreich’s ataxia is caused by a single gene defect 

Profits from our products are used to partially fund the 

development of our patents and our pipeline. For fiscal  

year 2007 we reported an operating loss of $1.8 million 

and ended the year with $22.6 million in cash and invest-

ments and no debt.

that results in inadequate production of the protein frataxin. 

Our sound financial condition enables us to maintain owner-

Low levels of frataxin lead to degeneration of both the 

ship of our pipeline candidates through “proof-of-principle” 

nerves controlling muscle movements in the arms and  

clinical trials at which point we may seek a partner for fur-

legs and the nerve tissue in the spinal cord. Symptoms of 

ther development and marketing. We believe our diverse 

Friedreich’s ataxia typically emerge between the ages of  

asset base and sound business strategy provide us a 

5 and 15 and often progress to severe disability, incapac-

unique opportunity to develop products for unmet medical 

itation or loss of life in early adulthood. There is currently  

needs to the benefit of both patients and shareholders.

REPLIGEN CORPORATION

Index to Business and Financial Information for the Year Ended March 31, 2007

Selected Financial Data

Business

Management’s Discussion and Analysis of Financial Condition  
and Results of Operations

F.2

F.3

F.8

F.1

Market for Registrant’s Common Equity, Related Stockholder Matters  
and Issuer Purchases of Equity Securities

F.16

Stock Price Performance Graph

F.17

Statements of Operations

F.17

Balance Sheets

F.18

Statements of Cash Flows

F.19

Statements of Stockholders’ Equity

F.20

Notes to Financial Statements

F.21

Report of Independent Registered Public Accounting Firm F.34

Management’s Annual Report on Internal Control Over Financial Reporting

F.35

Attestation Report of the Independent Registered Public Accounting Firm F.36

2007 ANNUAL REPORT

SELECTED FINANCIAL DATA

The  following  selected  financial  data  are  derived  from  the  audited  financial  statements  of  Repligen.  The 
selected  financial  data  set  forth  below  should  be  read  in  conjunction  with  our  financial  statements  and  the 
related  notes  thereto  and  “Management’s  Discussion  and  Analysis  of  Financial  Condition  and  Results  of 
Operations” included elsewhere in this annual report and our Annual Report on Form 10-K for the years ended 
March 31, 2007, 2006, 2005, 2004 and 2003.

Revenue:
  Product revenue
  Other revenue

  Total revenue

Operating expenses:
  Cost of product revenue
  Research and development
  Selling, general and administrative
Impairment of long-lived asset

  Total operating expenses
Income (loss) from operations

Interest expense
Investment income
Other income

Net income (loss)

Earnings Per Share:
  Basic and diluted

Years ended March 31,

2007

2006

2005

2004

2003

(In thousands except per share amounts)

$  13,074
1,000

$  12,529
382

$ 

14,074

12,911

3,615
5,924
6,360
—

15,899
(1,825)

(11)
947
—

3,551
5,163
5,417
—

14,131
(1,220)

(3)
750
1,170

9,360
—

9,360

3,888
5,037
4,597
—

$ 

6,843
71

6,914

3,248
6,484
4,710
2,413

$ 

7,743
29

7,772

3,480
5,227
4,159
—

13,522
(4,162)

16,855
(9,941)

12,866
(5,094)

—
428
750

—
390
—

—
557
—

$ 

(889) $ 

697

$ 

(2,984) $ 

(9,551) $ 

(4,537)

$ 

(0.03) $ 

0.02

$ 

(0.10) $ 

(0.32) $ 

(0.17)

F.2

Weighted average shares outstanding:
  Basic

  Diluted

30,379

30,379

30,125

30,691

30,062

30,062

29,686

29,686

26,813

26,813

Balance Sheet Data:
Cash and marketable securities*
Working capital
Total assets
Long-term obligations
Accumulated deficit
Stockholders’ equity

As of March 31,

2007

2006

2005

2004

2003

(In thousands)

$  22,627
22,394
29,076
200
(157,683)
25,538

$  23,408
18,575
28,599
231
(156,794)
25,433

$  23,523
15,673
27,607
120
(157,491)
24,290

$  24,269
13,684
29,615
86
(154,507)
27,164

$  18,709
15,602
26,793
2
(144,956)
24,550

* Excludes restricted cash of $200,000 restricted as part of our headquarters lease arrangement for all years presented.

REPLIGEN CORPORATION

 
 
 
 
BUSINESS

The  following  discussion  of  our  business  contains 
forward-looking  statements  that  involve  risks  and 
uncertainties.  When  used  in  this  report,  the  words 
“intend,” “anticipate,” “believe,” “estimate,” “plan” 
and  “expect”  and  similar  expressions  as  they  relate 
to  us  are  included  to  identify  forward-looking  state-
ments. Our actual results could differ materially from 
those  anticipated  in  these  forward-looking  state-
ments  and  are  a  result  of  certain  factors,  including 
those  set  forth  under  “Risk  Factors”  in  our  Annual 
Report on Form 10-K.

Our Company
Repligen  Corporation  (“Repligen,”  the  “Company” 
or  “we”)  is  developing  novel  therapeutics  for  the 
treatment of diseases of the central nervous system. 
We  also  own  intellectual  property  on  two  biological 
therapies which may provide future revenues to sup-
port our product development efforts in neurological 
diseases.  We  also  are  a  leading  manufacturer  of 
Protein  A  which  is  used  in  the  production  of  many 
therapeutic monoclonal antibodies.

Our business strategy is to maintain full commercial 
rights  to  our  product  candidates  through  “proof  of 
principle”  clinical  studies  after  which  we  may  seek 
corporate partners for further development and mar-
keting.  We  partially  fund  the  development  of  our  
proprietary  therapeutic  product  candidates  with  the 
profits  derived  from  the  sales  of  our  commercial 
products.  This  will  enable  us  to  independently 
advance our products with less financial risk.

We were incorporated in May 1981, under the laws 
of  the  State  of  Delaware.  Our  principle  execu-
tive  offices  are  at  41  Seyon  Street,  Waltham, 
Massachusetts 02453 and our telephone number is 
(781) 250-0111.

Currently Marketed Products
We  currently  sell  two  products:  Protein  A,  which  is 
used in the production of monoclonal antibodies, and 
SecreFlo®, a synthetic form of the hormone secretin, 
which  is  used  as  an  aid  in  the  diagnosis  of  certain 
diseases of the pancreas.

Protein A Products for Antibody Manufacturing
Protein A is widely used in the purification of thera-
peutic  monoclonal  antibodies.  Most  therapeutic 
monoclonal  antibodies  are  manufactured  by  the  fer-
mentation  of  mammalian  cells  that  express  the 
monoclonal  antibody.  The  monoclonal  antibody  is 
typically  produced  by  a  process  in  which  an  impure 
fermentation  broth  containing  the  desired  monoclo-
nal antibody is passed over a solid support to which 
Protein A has been chemically attached or “immobi-
lized.” The immobilized Protein A binds the monoclo-
nal antibody while other impurities are washed away.  

The monoclonal antibody is then recovered from the 
support in a substantially purified form.

We manufacture and market several products based 
on  recombinant  forms  of  Protein  A.  Our  primary  
customers  incorporate  our  Protein  A  products  into 
their  proprietary  monoclonal  antibody  purification 
systems  that  they  sell  directly  to  the  biotechnology 
and  pharmaceutical  industry.  In  February  2005,  we 
announced  an  amended  and  expanded  Supply 
Agreement  (“the  Agreement”)  with  GE  Healthcare 
(“GEHC”),  the  leading  supplier  of  purification  prod-
ucts to the biopharmaceutical industry and the larg-
est consumer of Protein A. The Agreement calls for 
Repligen  to  be  the  primary  supplier  of  Protein  A  to 
GEHC  through  2010.  During  2006,  we  completed 
the  scaleup  and  production  of  a  modified  form  of 
Protein  A  for  GEHC,  which  may  provide  additional 
value  to  the  producers  of  monoclonal  antibodies.  In 
addition, we have a long-term supply agreement with 
Applied  Biosystems  that  provides  that  Repligen  will 
be  the  preferred  provider  of  recombinant  Protein  A  
to Applied Biosystems until 2011. The majority of our 
product sales for the last three years have been sales 
of Protein A products.

Sales  of  therapeutic  monoclonal  antibodies  have 
increased from $300 million in 1997 to approximately 
$20  billion  in  2006.  This  growth  is  based  on  the 
increasing  use  of  therapeutic  antibodies,  including 
Erbitux® for colon cancer, Synagis® for RSV infection 
and  Remicade®  for  Crohn’s  disease  and  arthritis. 
There are more than 150 additional monoclonal anti-
bodies in various stages of clinical testing which may 
lead to additional growth of the antibody market and, 
in turn, increased demand for Protein A.

SecreFlo® for Pancreatic Diagnosis
In October 1999, we licensed exclusive commercial 
rights  to  a  diagnostic  product  based  on  a  synthetic 
form  of  porcine  ( pig - derived )  secretin,  which  
we  market  as  SecreFlo ®,  from  ChiRhoClin,  Inc. 
(“ChiRhoClin”), a private company. ChiRhoClin is our 
sole supplier of SecreFlo®. SecreFlo® is approved by 
the  U.S.  Food  and  Drug  Administration  (“FDA”)  as 
an  aid  in  the  diagnosis  of  chronic  pancreatitis  and 
gastrinoma  (a  form  of  cancer)  and  as  an  aid  during 
endoscopic  retrograde  cholangiopancreatography 
(“ERCP”), a gastrointestinal procedure. In 2004, we 
terminated our agreement with ChiRhoClin for breach 
and filed an arbitration proceeding against ChiRhoClin 
for  their  alleged  failure  to  meet  certain  obligations 
related  to  product  and  clinical  development.  In  May 
2005,  we  announced  the  settlement  of  the  arbitra-
tion proceeding through an agreement by which we 
will  continue  to  sell  SecreFlo®.  We  estimate  that 
sales of SecreFlo® will continue through March 2009, 
when our product supply will cease.

2007 ANNUAL REPORT

F.3

F.4

BUSINESS (continued)

Intellectual Property on Monoclonal Antibody 
and Antibody Fusion Products

Erbitux ®
Erbitux®  is  a  monoclonal  antibody  developed  by 
ImClone  Systems  Incorporated  (“ImClone”)  which 
was  approved  by  the  FDA  in  February  2004  for  the 
treatment  of  certain  forms  of  colon  cancer  and  in 
March 2006 for the treatment of head and neck can-
cer. We believe that Erbitux® is manufactured with a 
cell  line  created  by  a  company  whose  assets  were 
subsequently  acquired  by  Repligen.  This  cell  line 
contains  certain  patented  genetic  technologies 
(“DNA  enhancers”)  which  increase  the  productivity 
of  a  cell  line.  This  patent  is  assigned  to  MIT  and 
exclusively licensed to Repligen. ImClone previously 
announced  that  it  had  manufactured  approximately 
$1  billion  of  Erbitux®  as  of  February  2004.  ImClone 
has reported that nearly all of this pre-approval stock-
pile of Erbitux® was exhausted by the end of Decem-
ber  2005.  In  May  2004,  Repligen  and  MIT  jointly 
filed a lawsuit against ImClone in U.S. District Court 
for  Massachusetts  alleging  that  ImClone  has 
infringed  our  patent  rights  in  its  production  of 
Erbitux®.  Our  patent  expired  in  May  2004  and  we 
have applied for a 5-year term extension for the pat-
ent, or until May 2009.

CTLA4-Ig
CTLA4 is a key regulator of the activity of the immune 
system. CTLA4 “turns off” the immune system after 
it  has  successfully  cleared  a  bacterial  or  viral  infec-
tion by blocking the activation of T-cells, the immune 
cells  responsible  for  initiating  an  immune  response. 
In  the  1990’s,  our  collaborators  at  the  University  of 
Michigan and the U.S. Navy demonstrated in animal 
models that a fusion protein consisting of fragments 
of  CTLA4  and  an  antibody  (“CTLA4-Ig”)  could  be 
used to block organ transplant rejection and to treat 
certain autoimmune diseases. Additional animal and 
human studies by many other groups have confirmed 
that  CTLA4-Ig  may  be  useful  in  treating  diseases 
such as rheumatoid arthritis, multiple sclerosis, lupus, 
psoriasis and organ transplant rejection. CTLA4-Ig’s 
mechanism  of  action  is  different  from  the  current 
therapies  for  autoimmune  disease  or  organ  trans-
plant  rejection,  thus  it  may  provide  a  treatment  for 
patients who are refractory to existing therapies.

In December 2005, the FDA approved Bristol-Myers 
Squibb  Corporation’s  (“Bristol”)  application  to  mar-
ket  CTLA4-Ig,  under  the  brand  name  Orencia®,  for 
treatment  of  rheumatoid  arthritis.  Bristol  started 
commercial sales of Orencia® in February 2006.

In  January  2006,  Repligen  and  the  University  of 
Michigan  jointly  filed  a  lawsuit  against  Bristol  in  
the  United  States  District  Court  for  the  Eastern 
District of Texas for infringement of U.S. Patent No. 
6,685,941. The patent, entitled “Methods of Treating 

Autoimmune  Disease  via  CTLA4-Ig,”  covers  meth-
ods  of  using  CTLA4-Ig  to  treat  rheumatoid  arthritis, 
as  well  as  other  therapeutic  methods.  The  patent  
is  in  force  until  2021.  Repligen  has  exclusive  rights  
to  this  patent  from  its  owners,  the  University  of 
Michigan and the U.S. Navy.

Development Stage Products for 
Neuropsychiatric Disorders

Secretin for MRI
Secretin  is  a  well-known  hormone  produced  in  the 
small  intestine  that  regulates  the  function  of  the  
pancreas as part of the process of digestion. We are 
currently evaluating secretin for improvement of MRI 
imaging of the pancreas.

Several  reports  published  in  the  literature  support 
the  use  of  secretin  with  abdominal  MRI  imaging  to 
improve visualization of pancreaticobiliary structures 
and  to  increase  diagnostic  sensitivity  relative  to 
unenhanced abdominal MRI. MRI technology images 
stationary water thus the use of secretin during MRI 
harnesses the natural biologic properties of secretin, 
which signals the release of water-rich fluids into the 
ducts of the pancreas. Improvement in the detection 
and  delineation  of  normal  and  abnormal  structures 
with MRI is attractive for patient care as it can obvi-
ate the need for more risky invasive procedures.

In  June  2006,  we  initiated  a  Phase  2  clinical  trial  to 
evaluate the use of RG1068, synthetic human secre-
tin, as an agent to improve the detection of structural 
abnormalities  of  the  pancreatic  ducts  during  MRI 
imaging  of  the  pancreas.  This  was  a  multi-center, 
baseline  controlled,  single  dose  study  in  which  
80  patients  with  a  history  of  pancreatitis  receive  a 
secretin-enhanced  MRI  and  an  unenhanced  MRI  of 
the pancreas.

In  May  2007,  we  announced  positive  results  from 
this  Phase  2  clinical  trial  to  evaluate  the  use  of 
RG1068,  synthetic  human  secretin,  to  improve  
the  assessment  of  pancreatic  duct  structures  by 
MRI.  The  study  showed  an  improvement  in  sensi-
tivity  of  detection  of  structural  abnormalities  of  
the  pancreatic  duct  of  approximately  20%  with  no 
loss  in  specificity,  consistent  with  prior  data  and 
expectations.  In  addition,  the  study  showed  highly 
significant  increases  in  the  following  three  assess-
ments:  physician  confidence  in  their  ability  to  
identify  structural  abnormalities,  the  number  of  
pancreatic  duct  segments  visualized  and  improve-
ment  in  the  overall  quality  of  the  MRI  images. 
Detailed  visual  assessment  of  the  pancreatic  ducts 
and identification of structural abnormalities is impor-
tant  in  the  assessment,  diagnosis  and  treatment  
of  diseases  such  as  acute  and  chronic  pancreatitis. 
We believe these results establish the basis for dis-
cussions  with  the  FDA  regarding  a  clinical  plan  to 

REPLIGEN CORPORATION

BUSINESS (continued)

receive marketing approval for secretin for MRI imag-
ing of the pancreas.

Uridine for Bipolar Depression
Uridine  is  a  biological  compound  essential  for  the 
synthesis  of  DNA  and  RNA,  the  basic  hereditary 
material  found  in  all  cells,  and  numerous  other  fac-
tors  essential  for  cell  metabolism.  Uridine  is  syn-
thesized by the power plant of the human cell known 
as the mitochondria. The rationale for uridine therapy 
in  CNS  disorders  is  supported  by  pre-clinical  and 
clinical  research.  Researchers  at  McLean  Hospital 
previously  demonstrated  that  uridine  is  active  in  a 
well-validated  animal  model  of  depression.  Recent 
reports  indicate  that  certain  genes  that  encode  
for  mitochondrial  proteins  are  significantly  down- 
regulated in the brains of bipolar patients. This new 
insight  suggests  that  the  symptoms  of  bipolar  dis-
order  may  be  linked  to  dysregulation  of  energy 
metabolism of the brain.

Bipolar disorder, also known as manic depression, is 
marked  by  extreme  changes  in  mood,  energy  and 
behavior  in  which  a  person  can  alternate  between 
mania  (highs)  and  depression  (lows).  Bipolar  disor-
der  affects  more  than  2  million  adults  in  the  United 
States.  Current  drug  therapy  for  bipolar  disorder 
includes  the  use  of  lithium  and  anti-depressants. 
However, side effects are frequent and troublesome, 
and patients do not respond fully, leading to frequent 
recurrences of mania and depression.

In March 2006, we initiated a Phase 2 clinical trial of 
RG2417,  an  oral  formulation  of  uridine,  in  patients 
with  bipolar  depression.  This  Phase  2  study  is  a 
multi-center,  dose  escalating  study  in  which  80 
patients  will  receive  either  RG2417  or  a  placebo  for  
six  weeks.  Patients  will  be  evaluated  for  the  safety 
and  effectiveness  of  RG2417  on  the  symptoms  of 
bipolar  depression.  This  study  is  being  conducted 
under  a  development  agreement  with  the  Stanley 
Medical  Research  Institute,  under  which  Repligen 
will  receive  approximately  $1,200,000  in  funding. 
The Stanley Medical Research Institute is the largest 
nonprofit provider of funding for research on schizo-
phrenia and bipolar disorder in the United States. We 
have completed patient enrollment in this study and 
we anticipate release of top line data later in 2007.

Repligen  previously  completed  a  six-week  Phase  1 
clinical  trial  of  a  prodrug  of  uridine  (RG2133)  in 
patients  with  bipolar  disorder  or  major  depression. 
The  results  demonstrated  that  administration  of 
RG2133  in  this  patient  population  appeared  to  be 
safe,  did  not  induce  mania,  and  provided  early  evi-
dence of a clinical effect of the drug. The trial evalu-
ated 19 patients and was carried out by investigators 
at  McLean  Hospital,  the  largest  psychiatric  clinical 
care,  teaching  and  research  affiliate  of  Harvard 
Medical School.

Transcription Enhancers for Friedreich’s Ataxia
Symptoms  of  Friedreich’s  ataxia  typically  emerge 
between the ages of five and 15 and often progress 
to  severe  disability,  incapacitation  or  loss  of  life  in 
early  adulthood.  Friedreich’s  ataxia  is  caused  by  a 
single gene defect that results in inadequate produc-
tion  of  the  protein  frataxin.  The  protein  frataxin 
appears to be essential for the proper functioning of 
the mitochondria, the power plant of both neural and 
muscle cells. Low levels of frataxin lead to degenera-
tion  of  both  the  nerves  controlling  muscle  move-
ments  in  the  arms  and  legs  and  the  nerve  tissue  in 
the  spinal  cord.  Approximately  one  in  every  50,000 
people in the United States has Friedreich’s ataxia.

In  April  2007,  we  announced  that  we  entered  into  
an  exclusive  commercial  license  with  The  Scripps 
Research  Institute  for  intellectual  property  covering 
compounds  which  may  have  utility  in  treating 
Friedreich’s ataxia. Friedreich’s ataxia is an inherited 
neurodegenerative  disease  in  which  low  levels  of  
the  protein  frataxin  result  in  progressive  damage  to 
the  nervous  system  and  loss  of  muscle  function. 
Research  in  tissues  derived  from  patients  as  well  
as  in  mice  indicates  that  the  licensed  compounds 
increase  production  of  the  protein  frataxin,  which 
suggests  potential  utility  of  these  compounds  in 
slowing or stopping progression of the disease. There 
is currently no treatment for Friedreich’s ataxia.

Data  supporting  the  ability  of  the  licensed  com-
pounds to increase production of the protein frataxin 
was  published  in  Nature  Chemical  Biology  (August 
20,  2006 ).  This  research  was  lead  by  Dr.  Joel 
Gottesfeld,  professor  of  molecular  biology  at  The 
Scripps Research Institute, and supported in part by 
the  Friedreich’s  Ataxia  Research  Alliance  (FARA). 
These  compounds  are  the  only  ones  to  date  that 
have demonstrated utility in increasing both the level 
of the frataxin protein in tissue samples from patients 
with Friedreich’s ataxia as well as frataxin gene activ-
ity in animal models. Preliminary data also suggests 
that  these  compounds  may  have  utility  in  treating 
other disorders such as Spinal Muscular Atrophy and 
Huntington’s disease.

Repligen’s Business Strategy
Our business strategy is to maintain full commercial 
rights  to  our  product  candidates  through  “proof  
of  principle”  clinical  studies  after  which  we  may  
seek corporate partners for further development and 
marketing. We partially fund the development of our 
proprietary  therapeutic  product  candidates  with  the 
profits  derived  from  the  sales  of  our  commercial 
products.  This  will  enable  us  to  independently 
advance  our  product  candidates  while  reducing  our 
financial risks.

2007 ANNUAL REPORT

F.5

F.6

BUSINESS (continued)

Sales and Marketing
We  sell  our  Protein  A  products  primarily  through 
value-added  resellers  including  GEHC  and  Applied 
Biosystems,  Inc.,  as  well  as  through  distributors  
in  certain  foreign  markets.  We  market  SecreFlo® 
directly to gastroenterologists in the United States.

Significant Customers and  
Geographic Reporting
Customers  for  our  Protein  A  products  include  chro-
matography  companies,  diagnostics  companies,  
biopharmaceutical  companies  and  laborator y 
researchers. During fiscal years 2007 and 2006, the 
customers that accounted for more than 10% of our 
total  revenue  were  GEHC  and  Applied  Biosystems, 
Inc.  During  fiscal  year  2005,  the  customers  that 
accounted  for  more  than  10%  of  our  total  revenue 
were  GEHC,  Applied  Biosystems,  Inc.  and  Cardinal 
Healthcare.

Of  our  fiscal  2007  product  revenue,  47%  is  attrib-
utable to U.S. customers and 53% is attributable to 
foreign  customers,  of  which  72%  is  attributable  
to two customers. Of our fiscal 2006 revenue, 48% 
is attributable to U.S. customers and 52% is attribut-
able  to  foreign  customers,  of  which  75%  is  attrib-
utable to two customers. Of our fiscal 2005 revenue, 
43%  is  attributable  to  U.S.  customers  and  56%  is 
attributable  to  foreign  customers,  of  which  77%  
is attributable to three customers.

Employees
As of June 6, 2007, we had 45 employees. Of those 
employees,  32  were  engaged  in  research,  develop-
ment and manufacturing and 13 in administrative and 
marketing functions. Sixteen of our employees hold 
doctorates  or  other  advanced  degrees.  Each  of  our 
employees  has  signed  a  confidentiality  agreement. 
None  of  our  employees  are  covered  by  collective 
bargaining agreements.

Patents, Licenses and Proprietary Rights
Our policy is to seek patent protection for our thera-
peutic product candidates. We pursue patent protec-
tion  in  the  United  States  and  file  corresponding 
patent  applications  in  relevant  foreign  jurisdictions. 
We believe that patents are an important element in 
the  protection  of  our  competitive  and  proprietary 
position, but other elements, including trade secrets, 
orphan  drug  status  and  know-how,  may  also  be 
important. We own or have exclusive rights to more 
than  15  issued  U.S.  patents  and  corresponding  for-
eign equivalents. The terms of such patents expire at 
various  times  between  2009  and  2021.  No  patent 
material to our business expires before 2009. In addi-
tion,  we  have  rights  to  more  than  20  U.S.  pending 
patent  applications  and  corresponding  foreign  appli-
cations.  The  invalidation  of  key  patents  owned  or 

licensed  by  us  or  the  failure  of  patents  to  issue  on 
pending  patent  applications  could  create  increased 
competition,  with  potential  adverse  effects  on  our 
business  prospects.  For  each  of  our  license  agree-
ments where we license the rights to patents or pat-
ent applications, the license will terminate on the day 
that  the  last  to  expire  patent  covered  by  each  such 
license agreement expires.

We  also  rely  upon  trade  secret  protection  for  our 
confidential  and  proprietary  information.  Our  policy  
is  to  require  each  of  our  employees,  consultants, 
business  partners  and  significant  scientific  collabo-
rators  to  execute  confidentiality  agreements  upon 
the  commencement  of  an  employment,  consulting 
or business relationship with us. These agreements 
generally  provide  that  all  confidential  information 
developed  or  made  known  to  the  individual  during 
the  course  of  the  individual’s  relationship  with  us  
is  to  be  kept  confidential  and  not  disclosed  to  third 
parties except in specific circumstances. In the case 
of employees and consultants, the agreements gen-
erally  provide  that  all  inventions  conceived  by  the 
individual  in  the  course  of  rendering  services  to 
Repligen shall be our exclusive property.

CTLA4-Ig
We  are  the  exclusive  licensee  of  all  CTL A4 -Ig  
patent  rights  owned  by  the  University  of  Michigan 
(“Michigan”).  In  February  2004,  U.S.  Patent  No. 
6,685,941  (“the  ‘941  patent”)  issued,  to  which  we 
own the exclusive rights through license agreements 
with  Michigan  and  the  U.S.  Navy.  The  ‘941  patent 
has  claims  that  cover  the  use  of  CTLA4-Ig  to  treat 
rheumatoid  arthritis,  multiple  sclerosis  and  certain 
other  autoimmune  disorders  and  is  assigned  to  the 
University of Michigan and the U.S. Navy. The ‘941 
patent expires in 2021.

Uridine
In  November  2000  and  December  2000,  Repligen 
entered  into  two  license  agreements  (the  “UCSD 
Uridine License Agreements”) with the University of 
California,  San  Diego  (“UCSD”)  for  certain  patent 
applications pertaining to the use of uridine and uri-
dine  derivatives  for  the  treatment  of  mitochondrial 
disease  and  purine  autism.  On  June  21,  2001,  Pro-
Neuron,  Inc.  filed  a  complaint  (the  “Pro-Neuron 
Complaint”)  against  the  Regents  of  the  University  
of  California  (the  “Regents”)  and  Repligen  in  the 
Superior  Court  of  California,  County  of  San  Diego 
seeking  to  void  the  UCSD  Uridine  License  Agree-
ment  relating  to  treatment  of  mitochondrial  disease 
entered  into  between  Repligen  and  the  UCSD.  Pro-
Neuron,  Inc.  subsequently  amended  the  complaint 
to  include  the  UCSD  Uridine  License  Agreement 
related to purine autism and claims for misappropria-
tion of trade secrets.

REPLIGEN CORPORATION

BUSINESS (continued)

In  June  2003,  Repligen  agreed  to  restructure  the 
UCSD  License  Agreements  to  exclude  the  field  of 
acylated pyrimidines, including triacetyluridine.

In April 2004, a U.S. patent was issued to Repligen 
and  University  of  California,  which  claims  methods 
of  treating  certain  developmental  disorders,  includ-
ing  certain  forms  of  autism,  with  uridine  compo-
sitions  which  expires  in  October  2020.  Foreign 
equivalents of this patent are pending. A patent with 
similar claims has recently issued in Australia.

Protein A
We own a U.S. patent covering recombinant Protein 
A, which expires in September 2009, as well as sig-
nificant know-how in the manufacture of high-purity 
Protein A. We also own a U.S. patent covering modi-
fied  forms  of  Protein  A,  which  was  non-exclusively 
licensed  to  Amersham  Biosciences  (now  GEHC)  in 
1998  as  part  of  a  ten-year  agreement,  which  was 
amended and extended in 2005 until 2010, covering 
the supply of Protein A to GEHC.

In addition to its utility in monoclonal antibody manu-
facturing,  Protein  A  may  also  be  useful  in  human 
therapy  based  on  its  activity  as  a  B- cell  toxin. 
Repligen has exclusively licensed rights from UCSD 
to a U.S. patent application which claims a variety of 
potential therapeutic uses of Protein A. Foreign equiv-
alents of this patent application are also pending.

Legal Proceedings

ImClone Systems
In  July  2006,  Repligen  reported  that  the  United 
States  District  Court  for  the  District  of  Massachu-
setts  issued  a  Summary  Judgment  ruling  in  favor  
of  Repligen  and  the  Massachusetts  Institute  of 
Technology  (“MIT”)  and  rejected  ImClone  Systems 
Incorporated’s (“ImClone”) defense of patent exhaus-
tion in the ongoing patent infringement lawsuit over 
the  production  of  Erbitux ®.  In  their  complaint, 
Repligen  and  MIT  allege  that  ImClone’s  production 
of  Erbitux®  infringes  U.S.  patent  4,663,281  which 
covers  certain  genetic  elements  that  increase  pro-
tein  production  in  a  mammalian  cell.  This  patent  is 
assigned to MIT and exclusively licensed to Repligen.

ImClone  had  previously  reported  that  it  produced 
approximately $1 billion worth of Erbitux® prior to the 
expiration  of  the  patent-in-suit  in  2004  and  that 
Bristol-Myers Squibb, ImClone’s commercial partner, 
has paid ImClone $900 million in up-front and mile-
stone payments as well as a 39% royalty on the net 
sales of Erbitux® in the United States.

Repligen  and  MIT  allege  that  the  cell  line  that 
ImClone uses to produce Erbitux® employs key tech-
nology that is claimed in the patent-in-suit. Repligen 
and  MIT  also  allege  that  the  cell  line  was  created 
under  contract  for  the  National  Cancer  Institute 
(“NCI”)  by  a  predecessor  to  Repligen  and  subse-
quently transferred from the NCI to ImClone for use 
in  research  and  development  only.  In  its  ruling,  the 
Court  found  that  neither  the  transfer  to  the  NCI  by 
Repligen’s predecessor nor the subsequent transfer 
to  ImClone  by  the  NCI  exhausted  the  proprietary 
rights  of  Repligen  and  MIT.  The  Court’s  ruling  has 
eliminated  these  arguments  as  a  potential  defense 
for ImClone at trial. Repligen and MIT intend to seek 
damages adequate to compensate Repligen and MIT 
for  ImClone’s  unlicensed  use  of  the  patented  tech-
nology  and  a  multiplier  of  any  such  damage  award 
based  on  ImClone’s  willful  infringement.  The  out-
come of this case is undeterminable at this time.

Bristol-Myers Squibb Company (“Bristol”)
In  January  2006,  Repligen  Corporation  and  the 
University  of  Michigan  jointly  filed  a  complaint 
against  Bristol  in  the  United  States  District  Court  
for  the  Eastern  District  of  Texas  for  infringement  of 
U.S.  Patent  No.  6,685,941  (“the  ‘941  patent”)  for 
the  commercial  sale  of  Orencia®.  The  ‘941  patent, 
entitled “Methods of Treating Autoimmune Disease 
via  CTLA4-Ig,”  covers  methods  of  using  CTLA4-Ig 
to  treat  rheumatoid  arthritis,  as  well  as  other  thera-
peutic methods. Repligen has exclusive rights to this 
patent  from  its  owners,  the  University  of  Michigan 
and the U.S. Navy. In February 2006, Bristol answered 
the complaint and counterclaimed seeking a declara-
tory  judgment  that  the  ‘941  patent  is  invalid  and 
unenforceable and that Bristol does not infringe the 
patent.  On  November  16,  2006,  the  Court  held  a 
scheduling conference. Jury selection for the trial in 
this  matter  is  scheduled  to  commence  on  April  7, 
2008. The outcome of this case is undeterminable at 
this time.

Other
From time to time, we may be subject to other legal 
proceedings  and  claims  in  the  ordinary  course  of 
business.  We  are  not  currently  aware  of  any  such 
proceedings  or  claims  that  we  believe  will  have,  
individually  or  in  the  aggregate,  a  material  adverse 
effect on our business, financial condition or results 
of operations.

F.7

2007 ANNUAL REPORT

F.8

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS

This  annual  report  contains  forward-looking  state-
ments  which  are  made  pursuant  to  the  safe  harbor 
provisions  of  Section  27A  of  the  Securities  Act  of 
1933,  and  Section  21E  of  the  Securities  Exchange 
Act  of  1934.  The  forward-looking  statements  in  this 
annual  report  do  not  constitute  guarantees  of  future 
performance. Investors are cautioned that statements 
in  this  annual  report  that  are  not  strictly  historical 
statements, including, without limitation, statements 
regarding  current  or  future  financial  performance, 
potential  impairment  of  future  earnings,  manage-
ment’s strategy, plans and objectives for future oper-
ations and product candidate acquisition, clinical trials 
and  results,  litigation  strategy,  product  research  and 
development,  research  and  development  expendi-
tures,  intellectual  property,  development  and  manu-
facturing  plans,  availability  of  materials  and  product 
and  adequacy  of  capital  resources  and  financing 
plans  constitute  forward-looking  statements.  Such 
forward-looking statements are subject to a number 
of  risks  and  uncertainties  that  could  cause  actual 
results  to  differ  materially  from  those  anticipated, 
including, without limitation, the risks identified under 
the caption “Risk Factors” and other risks detailed in 
our Annual Report on Form 10-K and our other filings 
with  the  Securities  and  Exchange  Commission.  We 
assume no obligation to update any forward-looking 
information contained in this annual report.

Overview
We  are  a  biopharmaceutical  company  focused  on 
the  development  of  novel  therapeutics  for  diseases 
that  affect  the  central  nervous  system.  A  number  
of  drug  development  programs  are  currently  being 
conducted  to  evaluate  our  drug  candidates  in  dis-
eases  such  as  bipolar  disorder  and  neurodegenera-
tion.  In  addition,  we  sell  two  commercial  products, 
Protein  A  for  monoclonal  antibody  purification  and 
SecreFlo® for assessment of pancreatic disorders. In 
fiscal  2007,  we  experienced  growth  in  sales  and 
profits from our commercial products business. Our 
business  strategy  is  to  deploy  the  profits  from  our 
current  commercial  products  and  any  revenue  that 
we  may  receive  from  our  patents  to  enable  us  to 
invest in the development of our product candidates 
in the treatment area of neurological diseases while 
reducing our financial risk.

Critical Accounting Policies and Estimates
While  our  significant  accounting  polices  are  more 
fully  described  in  notes  to  our  financial  statements, 
we have identified the policies and estimates below 
as critical to our business operations and the under-
standing  of  our  results  of  operations.  The  impact  
and any associated risks related to these policies on  

our  business  operations  is  discussed  throughout 
“Management’s  Discussion  and  Analysis  of  Finan-
cial  Condition”  and  “Results  of  Operations”  where 
such policies affect our reported and expected finan-
cial results.

Revenue Recognition
We  apply  Staff  Accounting  Bulletin  No.  104,  “Rev-
enue  Recognition”  (“SAB  No.  104”)  to  our  revenue 
arrangements.  We  generate  product  revenues  from 
the  sale  of  our  Protein  A  products  to  customers  in 
the  pharmaceutical  and  process  chromatography 
industries and from the sale of SecreFlo® to hospital-
based  gastroenterologists.  In  accordance  with  SAB 
No.  104,  we  recognize  revenue  related  to  product 
sales  upon  delivery  of  the  product  to  the  customer 
as long as there is persuasive evidence of an arrange-
ment,  the  sales  price  is  fixed  or  determinable  and 
collection  of  the  related  receivable  is  reasonably 
assured.  Determination  of  whether  these  criteria 
have  been  met  are  based  on  management’s  judg-
ments  primarily  regarding  the  fixed  nature  of  the  
fee  charged  for  product  delivered,  and  the  collect-
ibility  of  those  fees.  We  have  a  few  longstanding 
customers who comprise the majority of our revenue 
and  have  excellent  payment  history.  We  have  had  
no  significant  write-offs  of  uncollectible  invoices  
in  the  periods  presented.  Should  changes  in  condi-
tions  cause  management  to  determine  that  these 
criteria  are  not  met  for  certain  future  transactions, 
revenue recognized for any reporting period could be 
adversely affected.

At  the  time  of  sale,  we  also  evaluate  the  need  to 
accrue  for  warranty  and  sales  returns.  The  supply 
agreements we have with our customers and related 
purchase orders identify the terms and conditions of 
each  sale  and  the  price  of  the  goods  ordered.  Due  
to  the  nature  of  our  sales  arrangements,  inventory 
produced for sale is tested for quality specifications 
prior to shipment. Since the product is manufactured 
to  order  and  in  compliance  with  required  specifica-
tions prior to shipment, the likelihood of sales return, 
warranty or other issues is largely diminished. Sales 
returns and warranty issues are infrequent and have 
had nominal impact on our financial statements his-
torically.  Should  changes  in  conditions  cause  man-
agement to determine that warranty, returns or other 
sale-related reserves are necessary for certain future 
transactions,  revenue  recognized  for  any  reporting 
period could be adversely affected.

During  the  fiscal  years  ended  March  31,  2007  and 
March  31,  2006,  we  recognized  $ 825,000  and 
$310,000, respectively, of revenue from a sponsored 
research  and  development  project  under  an  agree-
ment  with  the  Stanley  Medical  Research  Institute 
(“SMRI”). Research revenue is recognized on a cost 
plus  fixed-fee  basis  when  the  expense  has  been 

REPLIGEN CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

incurred  and  services  have  been  performed.  Deter-
mination  of  which  costs  incurred  qualify  for  reim-
bursement  under  the  terms  of  our  contractual 
agreement  and  the  timing  of  when  such  costs  
were  incurred  involves  the  judgment  of  manage-
ment.  Our  calculations  are  based  upon  the  agreed-
upon terms as stated in our arrangement. However, 
should our estimated calculations change or be chal-
lenged by SMRI, research revenue may be adjusted 
in  subsequent  periods.  Our  calculations  have  not  
historically  changed  or  been  challenged  and  we  
do not anticipate any subsequent change in our rev-
enue related to this sponsored research and develop-
ment project.

Additionally,  during  fiscal  years  2007  and  2006,  the 
Company  earned  and  recognized  approximately 
$175,000 and $72,000, respectively, in royalty reve-
nue  from  ChiRhoClin.  Revenues  earned  from 
ChiRhoClin  royalties  are  recorded  in  the  periods 
when they are earned based on royalty reports sent 
by ChiRhoClin to the Company.

There  have  been  no  material  changes  to  our  initial 
estimates  related  to  revenue  recognition  in  any  
periods  presented  in  the  accompanying  financial 
statements.

Inventories
Inventories  relate  to  our  Protein  A  business.  We 
value inventory at cost or, if lower, fair market value. 
We  determine  cost  using  the  first-in,  first-out 
method. We review our inventories at least quarterly 
and record a provision for excess and obsolete inven-
tory  based  on  our  estimates  of  expected  sales  
volume,  production  capacity  and  expiration  dates  of 
raw  materials,  work-in-process  and  finished  goods. 
Expected  sales  volumes  are  determined  based  on 
supply  forecasts  provided  by  our  key  customers  for 
the  next  three  to  twelve  months.  We  write  down 
inventory  that  has  become  obsolete,  inventory  that 
has a cost basis in excess of its expected net realiz-
able  value,  and  inventory  in  excess  of  expected 
requirements  to  cost  of  goods  sold.  Manufacturing 
of  Protein  A  finished  goods  is  done  to  order  and 
tested for quality specifications prior to shipment.

A  change  in  the  estimated  timing  or  amount  of 
demand  for  our  products  could  result  in  additional 
provisions  for  excess  inventory  quantities  on  hand. 
Any  significant  unanticipated  changes  in  demand  or 
unexpected  quality  failures  could  have  a  significant 
impact  on  the  value  of  our  inventory  and  reported 
operating  results.  During  all  periods  presented  in  
the  accompanying  financial  statements,  there  has 
been  no  material  adjustments  related  to  a  revised 
estimate of inventory valuations.

Accrued Liabilities
We  prepare  our  financial  statements  in  accordance 
with accounting principles generally accepted in the 
United States. These principles require that we esti-
mate  accrued  liabilities.  This  process  involves  iden-
tifying services, which have been performed on our 
behalf, and estimating the level of service performed 
and  the  associated  cost  incurred  for  such  service  
as  of  each  balance  sheet  date.  Examples  of  esti-
mated  accrued  expenses  include:  1)  Fees  paid  to  
our  contract  manufacturers  in  conjunction  with  the 
production of clinical materials. These expenses are 
normally determined through a contract or purchase 
order  issued  by  the  Company;  2)  Service  fees  paid  
to organizations for their performance in conducting 
our  clinical  trials.  These  expenses  are  determined  
by  contracts  in  place  for  those  services  and  com-
munications  with  project  managers  on  costs  which 
have  been  incurred  as  of  each  reporting  date;  and  
3) Professional and consulting fees incurred with law 
firms,  audit  and  accounting  service  providers  and 
other  third-party  consultants.  These  expenses  are 
determined  by  either  requesting  those  service  pro-
viders to estimate unbilled services at each reporting 
date for services incurred, or tracking costs incurred 
by  service  providers  under  fixed-fee  arrangements. 
We  have  processes  in  place  to  estimate  the  appro-
priate  amounts  to  record  for  accrued  liabilities,  
which  principally  involve  the  applicable  personnel 
reviewing  the  services  provided.  In  the  event  that 
we do not identify certain costs which have begun to 
be  incurred  or  we  under-  or  over-estimate  the  level 
of services performed or the costs of such services, 
our  reported  expenses  for  that  period  may  be  too 
low or too high. The date on which certain services 
commence,  the  level  of  services  performed  on  or 
before  a  given  date,  and  the  cost  of  such  services 
are  often  judgmental.  We  make  these  judgments 
based  upon  the  facts  and  circumstances  known  to 
us at the date of the financial statements.

A change in the estimated cost or volume of services 
provided could result in additional accrued liabilities. 
Any  significant  unanticipated  changes  in  such  esti-
mates  could  have  a  significant  impact  on  our  
accrued  liabilities  and  reported  operating  results. 
There  has  been  no  material  adjustments  to  our 
accrued liabilities in any of the periods presented in 
the accompanying financial statements.

Stock-Based Compensation
Effective  April  1,  2006,  we  adopted  the  fair  value 
recognition  provisions  of  Statement  of  Financial 
Accounting  Standards  No.  123R,  “Share-Based 
Payment—An Amendment of FASB Statements No. 
123 and 95,” or SFAS No. 123R, using the modified 
prospective  transition  method.  Under  this  transition  

2007 ANNUAL REPORT

F.9

F.10

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

method, compensation cost recognized in the state-
ment  of  operations  for  the  year  ended  March  31, 
2007  includes:  (a)  compensation  cost  for  all  share-
based payments granted prior to, but not yet vested 
as of April 1, 2006, based on the grant-date fair value 
estimated in accordance with the original provisions 
of  SFAS  No.  123  and  (b)  compensation  cost  for  all 
share-based  payments  granted,  modified  or  settled 
subsequent to April 1, 2006, based on the grant-date 
fair  value  estimated  in  accordance  with  the  provi-
sions  of  SFAS  No.  123R.  In  accordance  with  the 
modified  prospective  transition  method,  results  for 
prior periods have not been restated.

Effective  with  the  adoption  of  SFAS  No.  123R,  we 
have elected to use the Black-Scholes option-pricing 
model  to  calculate  the  fair  value  of  share-based 
awards on the grant date.

The expected term of options granted represents the 
period of time for which the options are expected to 
be  outstanding  and  is  derived  from  our  historical 
stock  option  exercise  experience  and  option  expira-
tion data. For option grants made subsequent to the 
adoption  of  SFAS  No.  123R,  the  expected  life  of 
stock  options  granted  is  based  on  the  simplified 
method  allowable  under  SAB  No.  107.  Accordingly, 
the  expected  term  is  presumed  to  be  the  midpoint 
between  the  vesting  date  and  the  end  of  the  con-
tractual term. In addition, for purposes of estimating 
the expected term, we have aggregated all individual 
option  awards  into  one  group  as  we  do  not  expect 
substantial  differences  in  exercise  behavior  among 
its  employees.  The  expected  volatility  is  a  measure 
of the amount by which our stock price is expected 
to  fluctuate  during  the  expected  term  of  options 
granted. We determined the expected volatility solely 
based  upon  the  historical  volatility  of  our  Common 
Stock over a period commensurate with the option’s 
expected  term.  We  do  not  believe  that  the  future 
volatility  of  our  Common  Stock  over  an  option’s 
expected  term  is  likely  to  differ  significantly  from  
the  past.  The  risk-free  interest  rate  is  the  implied 
yield  available  on  U.S.  Treasury  zero-coupon  issues 
with a remaining term equal to the option’s expected 
term  on  the  grant  date.  We  have  never  declared  
or  paid  any  cash  dividends  on  any  of  our  capital  
stock and do not expect to do so in the foreseeable 
future.  Accordingly,  we  use  an  expected  dividend 
yield of zero to calculate the grant-date fair value of  
a stock option.

Forfeitures  represent  only  the  unvested  portion  of  
a  surrendered  option.  SFAS  No.  123R  requires  for-
feitures  to  be  estimated  at  the  time  of  grant  and 
revised, if necessary, in subsequent periods if actual 
forfeitures  differ  from  those  estimates.  Prior  to  the 
adoption  of  SFAS  No.  123R,  we  accounted  for  for-
feitures  upon  occurrence  as  permitted  under  SFAS 
No.  123.  Based  on  an  analysis  of  historical  data,  
we  have  calculated  an  8%  annual  forfeiture  rate  for 
non-director-level employees, a 3% annual forfeiture 
rate for director-level employees, and a 0% forfeiture 
rate  for  non-employee  members  of  the  Board  of 
Directors, which we believe is a reasonable assump-
tion to estimate forfeitures. However, the estimation 
of  forfeitures  requires  significant  judgment,  and  to 
the extent actual results or updated estimates differ 
from  our  current  estimates,  such  amounts  will  be 
recorded  as  a  cumulative  adjustment  in  the  period 
estimates are revised.

Prior to April 1, 2006, we applied the pro forma dis-
closure  requirements  under  SFAS  No.  123  and 
accounted for our stock-based employee compensa-
tion plans using the intrinsic value method under the 
recognition and measurement provisions of Account-
ing  Principles  Board  Opinion  No.  25,  “Accounting  
for Stock Issued to Employees,” (“APB No. 25”) and 
related  interpretations.  Accordingly,  no  stock-based 
employee compensation cost was recognized in the 
statement  of  operations  for  the  year  ended  March 
31,  2006,  as  all  stock  options  granted  under  our 
existing  stock  plans  had  an  exercise  price  equal  to 
the  market  value  of  the  underlying  Common  Stock 
on the date of grant.

For  the  year  ended  March  31,  2007,  we  recorded 
stock-based compensation expense of approximately 
$ 837,000  for  stock  options  granted  under  the 
Amended  and  Restated  2001  Repligen  Corporation 
Stock  Plan.  Basic  and  diluted  earnings  per  share 
amounts  for  the  year  ended  March  31,  2007  were 
decreased  by  $0.03,  as  a  result  of  the  adoption  of 
SFAS No. 123R.

As of March 31, 2007, there was $1,275,000 of total 
unrecognized compensation cost related to unvested 
share-based  awards.  This  cost  is  expected  to  be  
recognized over a weighted average remaining requi-
site  service  period  of  2.86  years.  The  Company 
expects  approximately  671,000  of  unvested  out-
standing options to vest over the next five years.

We  recognize  compensation  expense  on  a  straight-
line  basis  over  the  requisite  service  period  based 
upon  options  that  are  ultimately  expected  to  vest, 
and  accordingly,  such  compensation  expense  has 
been adjusted by an amount of estimated forfeitures.  

Results of Operations
The  following  discussion  of  the  financial  condition 
and results of operations should be read in conjunc-
tion with the accompanying financial statements and 
the related footnotes thereto.

REPLIGEN CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

Revenues: Total revenues for fiscal 2007, 2006 and 2005 were $14,074,000, $12,911,000 and $9,360,000. 
Revenues  for  the  years  ending  March  31,  2007,  2006  and  2005  were  primarily  comprised  of  sales  of  our  
commercial products, Protein A and SecreFlo®. During the fiscal year ended March 31, 2007, 2006 and 2005, 
sales of our commercial products were:

Protein A
SecreFlo®
Other product revenue

  Product revenue

Year ended March 31

% Change

2007

2006

2005

2007 vs. 2006

2006 vs. 2005

(In thousands, except percentages)

$ 11,127
1,947
—

$ 10,540
1,989
—

$ 7,134
2,189
37

6%
(2)%

$ 13,074

$ 12,529

$ 9,360

4%

48%
(9)%

34%

Substantially  all  of  our  products  based  on  recombi-
nant  Protein  A  are  sold  to  customers  who  incorpo-
rate our manufactured products into their proprietary 
antibody  purification  systems  to  be  sold  directly  to 
the  pharmaceutical  industry.  Monoclonal  antibodies 
are a well-established class of drug with applications 
in rheumatoid arthritis, asthma, Crohn’s disease and 
a variety of cancers. Sales of Protein A are therefore 
impacted  by  the  timing  of  large-scale  production 
orders  and  on  the  regulatory  approvals  for  such  
antibodies,  which  may  result  in  significant  quarterly 
fluctuations.

During  fiscal  2007,  Protein  A  sales  increased  by 
$587,000 or 6% over fiscal 2006. We shipped 13% 
less volume of Protein A in fiscal 2007 compared to 
fiscal  2006.  The  decrease  in  volume,  however,  did 
not reduce revenue compared to fiscal 2006, as the 
mix  of  products  sold  had  more  favorable  pricing 
resulting in a 19% positive impact on total revenue. 
The  Company  sells  different  Protein  A  products  at 
different  price  points.  The  mix of  products  sold  var-
ies  and  impacts  the  fluctuations  in  total  sales  reve-
nue from year to year.

During  fiscal  2006,  Protein  A  sales  increased  by 
$3,406,000 or 48%, primarily as a result of a rise in 
the demand for our Protein A products. The increase 
in sales volume of Protein A resulted in an increase 
in  revenues  of  49%.  This  increase  was  slightly  off-
set  by  a  decrease  in  the  total  sales  price  of  those 
products, which had an unfavorable impact of 1% on 
total revenues.

We  anticipate  that  sales  of  Protein  A  will  grow  in  
the  future  and  will  continue  to  be  subject  to  quar-
terly fluctuations due to timing of large-scale produc-
tion orders.

Sales of SecreFlo® decreased $42,000 or 2% in fis-
cal  2007  primarily  as  a  result  of  direct  competition  

with ChiRhoClin, our sole supplier of SecreFlo®, and 
reduced  sales  and  marketing  efforts.  Decreases  in 
sales  volume  impacted  sales  by  1%  of  the  prior 
year’s total. To remain competitive with ChiRhoClin, 
we reduced sales prices, which resulted in an unfa-
vorable impact of 1% on SecreFlo® revenues.

Sales  of  SecreFlo®  decreased  $200,000  or  9%  in  
fiscal 2006 primarily as a result of direct competition 
with our sole supplier of SecreFlo®, the reduction of 
sales  price  to  remain  competitive  and  as  a  result  of  
a  reduction  in  sales  and  marketing  efforts.  Compe-
tition with our sole supplier of SecreFlo® decreased 
the  volume  of  SecreFlo®  vials  sold,  unfavorably 
impacting  revenue  by  3%.  To  remain  competitive, 
we  reduced  sales  prices,  which  caused  an  unfavor-
able impact of 6% on SecreFlo® revenues.

The settlement in fiscal 2005 with our sole supplier 
of  SecreFlo®  provides  for  a  certain  amount  of  vials  
of product that we can ultimately ship. The last ship-
ment of SecreFlo® to the Company from ChiRhoClin 
should be in late calendar year 2007 and is expected 
to  allow  us  to  fill  sales  orders  into  fiscal  year  2009. 
We  expect  SecreFlo®  revenues  will  decline  by  one 
third  in  fiscal  2008  as  we  continue  to  reduce  sales 
and marketing efforts and focus our sales efforts on 
key customers.

During  the  fiscal  years  2007  and  2006,  we  recog-
nized $825,000 and $310,000, respectively, of reve-
nue  from  a  sponsored  research  and  development 
project under an agreement with the Stanley Medical 
Research  Institute.  Research  revenue  is  recognized 
for  costs  plus  fixed-fee  contracts  as  costs  are 
incurred.  Additionally,  during  fiscal  years  2007  and 
2006,  we  earned  and  recognized  approximately 
$175,000 and $72,000, respectively, in royalty reve-
nue from ChiRhoClin. We expect that total research 
and  license  revenues  will  decline  moderately  in  fis-
cal 2008.

F.11

2007 ANNUAL REPORT

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

Costs  and  Operating  Expenses:  Total  costs  and  operating  expenses  for  fiscal  2007,  2006  and  2005  were 
approximately $15,899,000, $14,131,000 and $13,522,000, respectively.

Costs and operating expenses:
  Cost of product revenue
  Research and development
  Selling, general and administrative

  Total operating expenses

Year ended March 31

% Change

2007

2006

2005

2007 vs. 2006

2006 vs. 2005

$  3,615
5,924
6,360

$  3,551
5,163
5,417

$  3,888
5,037
4,597

$ 15,899

$ 14,131

$ 13,522

  2%
15%
17%

13%

(9)%
3%
18%

5%

The increase in cost of product revenue of $64,000 
or 2% in fiscal 2007 is attributable to several factors. 
These include an increase of $163,000 in consulting 
costs  and  a  $128,000  increase  in  occupancy  and 
depreciation costs. Consulting, occupancy and depre-
ciation  costs  increased  due  to  the  costs  associated 
with  implementation  of  our  fermentation  facility  in 
fiscal 2007, as well as spending to improve our qual-
ity  and  redundancy  systems  to  meet  customer 
expectations.  Additionally,  we  incurred  $26,000  in 
stock-based compensation expense pursuant to the 
adoption  of  SFAS  No.  123R  and  had  an  increase  in 
labor  costs  of  $147,000  compared  to  fiscal  2006. 
These increases were offset by a decrease in Protein 
A  material  costs  of  $267,000  related  to  lower  vol-
ume of Protein A production in fiscal 2007 compared 
to fiscal 2006 and lower costs of $39,000 related to 
SecreFlo® sales.

The decrease in cost of product revenue of $337,000 
or 9% in fiscal 2006 is attributable to a decrease in 
royalty  and  amortization  fees  of  $1,236,000  associ-
ated with SecreFlo®, partially offset by an increase of 
$688,000  in  direct  materials  and  increased  person-
nel  costs  of  $189,000.  This  reduction  in  SecreFlo® 
related expenses is due to the settlement agreement 
in  May  of  2005  with  ChiRhoClin.  The  increase  in 
direct  material  and  personnel  costs  is  a  result  of 
growth  in  production  volume  and  a  small  increase  
in  the  number  of  employees  in  the  manufacturing 
department to support the 49% increase in volume 
of Protein A.

Research and development expenses for fiscal 2007, 
2006  and  2005  were  approximately  $ 5,924,000 
$5,163,000  and  $5,037,000,  respectively.  Research 
and  development  costs  primarily  include  costs  of 
internal  personnel,  external  research  collaborations, 
clinical trials and the costs associated with the man-
ufacturing  and  testing  of  clinical  materials.  We  cur-
rently  have  ongoing  research  and  development 
programs  that  support  our  product  candidates  of  

secretin  and  uridine.  In  addition,  we  are  involved  
with  a  number  of  early  stage  programs  that  may  or 
may not be further developed. Due to the small size 
of  the  Company  and  the  fact  that  these  various  
programs  share  personnel  and  fixed  costs  such  as 
facility  costs,  depreciation,  and  supplies,  we  do  not 
track our expenses by program.

Each  of  our  research  and  development  programs  is 
subject  to  risks  and  uncertainties,  including  the 
requirement  to  seek  regulatory  approvals  that  are 
outside of our control. For example, our clinical trials 
may  be  subject  to  delays  based  on  our  inability  to 
enroll  patients  at  the  rate  that  we  expect  to  meet  
the schedule for our planned clinical trials. Moreover, 
the  product  candidates  identified  in  these  research 
programs,  particularly  in  our  early  stage  programs, 
must  overcome  significant  technological,  manufac-
turing  and  marketing  challenges  before  they  can  be 
successfully  commercialized.  For  example,  results 
from our preclinical animal models may not be repli-
cated  in  our  clinical  trials  with  humans.  As  a  result  
of  these  risks  and  uncertainties,  we  are  unable  to 
predict with any certainty the period in which mate-
rial  net  cash  inflows  from  such  projects  could  be 
expected  to  commence  or  the  completion  date  of 
these programs.

These  risks  and  uncertainties  also  prevent  us  from 
estimating with any certainty the specific timing and 
future  costs  of  our  research  and  development  pro-
grams, although historical trends within the industry 
suggest  that  expenses  tend  to  increase  in  later 
stages  of  development.  Collaborations  with  com-
mercial vendors and academic researchers accounted 
for 40%, 36% and 37% of our research and develop-
ment  expenses  in  the  fiscal  years  ended  March  31, 
2007, 2006 and 2005, respectively. The outsourcing 
of such services provides us flexibility to discontinue 
or  increase  spending  depending  on  the  success  of 
our research and development programs.

F.12

REPLIGEN CORPORATION

 
MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

Research  and  development  expenses  increased  by 
$761,000 or 15% during fiscal 2007. This increase is 
largely attributable to higher clinical trial expenses of 
$959,000,  as  the  Company  enrolled  the  majority  of 
the  patients  in  our  two  clinical  trial  programs  for 
Uridine  for  bipolar  disorder  and  secretin  for  diag-
nostic  imaging.  Additionally,  there  were  increased 
personnel expenses of $66,000 due to slightly higher 
headcount  and  the  Company  incurred  stock-based 
compensation  expense  pursuant  to  the  adoption  of 
SFAS  No.  123R  in  fiscal  2007  of  $229,000.  These 
increases  were  offset  by  reductions  in  external 
research  expenses  of  $465,000.  This  was  due  to  a 
reduction in activities related to secretin drug manu-
facturing compared to fiscal 2006.

Research  and  development  expenses  increased  by 
$126,000 or 3% during fiscal 2006. This increase is 
largely attributable to higher clinical trial expenses of 
$192,000 as the Company had two clinical trial pro-
grams  in  fiscal  2006  for  Uridine  for  bipolar  disorder 
and  secretin  for  diagnostic  imaging  that  exceeded 
the  clinical  trial  programs  in  fiscal  2005  which  pri-
marily  consisted  of  the  secretin  for  schizophrenia 
trial.  There  were  increased  personnel  expenses  of 
$124,000 due to the addition of one clinical staff per-
son  to  support  the  increase  in  clinical  trials  and 
increased license expenses of $59,000 due to a new 
license with another company for research materials 
for  future  clinical  development.  These  increased 
expenses were offset by decreased expenses asso-
ciated with our external research of $222,000 due to 
decreased  non-recurring  pharmacology  studies  on 
two  of  our  research  compounds.  Clinical  material 
expenses  were  relatively  unchanged  from  fiscal 
2005 to fiscal 2006.

Future  research  and  development  expenses  are 
dependent  on  a  number  of  variables,  including  the 
cost  and  design  of  clinical  trials  and  external  costs 
such  as  manufacturing  of  clinical  materials.  We 
expect  our  research  and  development  expenses  in 
fiscal 2008 to increase due to clinical trial expenses 
as  the  Company  continues  studies  for  secretin  for 
diagnostic  imaging,  continues  drug  manufacturing 
activities  for  secretin  and  begins  the  Friedreich’s 
ataxia  research  and  development  program  which 
was recently licensed by the Company. Additionally, 
there  may  be  further  increases  in  expenses  if  we 
acquire additional product candidates.

Selling, general and administrative expenses (“SG&A”) 
include  the  associated  costs  with  selling  our  com-
mercial  products  and  costs  required  to  support  our 
research  and  development  efforts  including  legal, 
accounting,  patent,  shareholder  services  and  other 
administrative functions. In addition, SG&A expenses 
have historically included costs associated with vari-
ous litigation matters.

During fiscal 2007, SG&A costs increased by approx-
imately $943,000 or 17%. This increase was mainly 
the result of the stock-based compensation expense 
recorded  pursuant  to  the  adoption  of  SFAS  No. 
123R  of  $582,000  and  personnel  expenses  which 
increased  by  $287,000  due  to  compensation  and 
benefit  increases.  Investor  relations  expenses  also 
increased  $78,000  due  to  expanded  outreach  to  
the  investment  community.  Legal  expenses  were 
consistent  with  fiscal  2006  as  we  continue  to  pros-
ecute  patent  infringement  lawsuits  against  Bristol 
and ImClone.

During fiscal 2006, SG&A costs increased by approx-
imately  $820,000  or  18%.  This  increase  was  partly 
the  result  of  increased  personnel  expenses  of 
$291,000  due  to  the  addition  of  two  senior  manag-
ers  to  support  our  growing  business.  Additionally, 
professional  expenses  increased  $271,000  related  
to  recruiting  expenses  for  the  new  senior  manage-
ment  and  increased  external  investor  relations  con-
sulting for the Company to expand awareness in the 
investor  community.  Legal  expenses  increased  by 
$176,000  due  to  the  Company  filing  suit  against 
Bristol  for  patent  infringement  and  continued 
expenses  supporting  the  patent  infringement  suit 
against ImClone.

We  expect  SG&A  expenses  to  increase  in  fiscal 
2008  due  to  anticipated  increases  in  litigation 
expenses  for  the  Bristol  and  ImClone  cases  com-
bined with higher headcount and the related person-
nel expenses.

Investment  Income:  Investment  income  includes 
income  earned  on  invested  cash  balances.  Invest-
ment  income  for  fiscal  2007,  2006  and  2005  was 
approximately  $948,000,  $750,000  and  $428,000, 
respectively.  The  increase  of  $198,000  or  21%  is 
attributable  to  higher  interest  rates.  The  increase  of 
$322,000  or  75%  in  fiscal  2006  is  attributable  to 
higher  interest  rates  compared  to  fiscal  2005.  We 
expect  interest  income  to  vary  based  on  changes  
in  the  amount  of  funds  invested  and  fluctuation  of 
interest rates.

Other  Income:  During  the  year  ended  March  31, 
2006,  Repligen  entered  into  a  Settlement  Agree-
ment  with  ChiRhoClin,  in  full  settlement  of  their  
arbitration  proceedings.  As  a  result  of  the  settle-
ment,  we  determined  that  we  were  not  required  to 
pay approximately $1,170,000 of previously  accrued 
but  unremitted  royalties  to  ChiRhoClin  related  to 
SecreFlo ®  sales  from  February  2004  to  March  
2005. This amount, which was accrued at March 31, 
2005,  was  reversed  at  the  time  of  settlement  and  
is recorded as other income in the fiscal year ended 
March 31, 2006.

2007 ANNUAL REPORT

F.13

F.14

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

Liquidity and Capital Resources
We  have  financed  our  operations  primarily  through 
sales of equity securities and revenues derived from 
product  sales  and  grants.  Our  revenue  for  the  fore-
seeable future will be limited to our product revenue 
related to Protein A and SecreFlo®. Revenues derived 
from the sales of SecreFlo™ vials are expected only 
through calendar year 2009. Given the uncertainties 
related  to  pharmaceutical  product  development,  we 

are  currently  unable  to  reliably  estimate  when,  if 
ever,  our  therapeutic  product  candidates  or  our  pat-
ents will generate revenue and cash flows.

At  March  31,  2007,  we  had  cash  and  marketable 
securities of $22,627,000 compared to $23,408,000 
at March 31, 2006. Deposits for leased office space 
of  $200,000  is  classified  as  restricted  cash  and  is 
not  included  in  cash  and  marketable  securities  total 
for either 2007 or 2006.

Cash Flows:

Cash provided by (used in)

Operating activities
Investing activities
Financing activities

Operating  Activities:  In  fiscal  2007,  our  operating 
activities provided cash of $405,000 which reflects a 
net  loss  of  approximately  $889,000  which  includes 
non-cash charges totaling approximately $1,376,000 
including depreciation, amortization and stock-based 
compensation  charges.  The  remaining  cash  flow 
from  operations  resulted  from  favorable  changes  in 
various working capital accounts.

In fiscal 2006, our operating activities provided cash 
of $415,000 as a result of our net profit of $697,000 
and  non-cash  charges  such  as  depreciation,  amor-
tization  and  stock  compensation  charges.  Sources  
of  cash  included  a  decrease  in  accounts  receivable  
of  approximately  $176,000  due  to  improved  cash  
collections  and  a  reduction  in  prepaid  expenses  of 
approximately  $134,000.  Uses  of  cash  included  an 
increase  in  inventories  of  approximately  $832,000 
which  was  a  result  of  purchases  related  to  a  man-
ufacturing  process  conversion  and  a  decrease  in 
accrued liabilities of approximately $328,000.

Year ended March 31,

2007

Increase/ 
(Decrease)

2006

Increase/ 
(Decrease)

2005

$  405
1,775
118

$  (10)
311
(215)

(In thousands)
$  415
1,464
333

$1,528
1,119
307

$ (1,113)
345
26

Investing Activities: In fiscal 2007, investing activi-
ties  included  capital  spending  of  $1,327,000  mainly 
related to the new fermentation facility in Waltham, 
Massachusetts. In fiscal 2006, our purchases of prop-
erty,  plant  and  equipment  were  $877,000  of  which 
$142,000  was  financed  through  capital  leases.  Pur-
chases  and  redemptions  of  marketable  securities 
account  for  the  remainder  of  the  fluctuation  during 
fiscal  2007  and  fiscal  2006.  We  generally  place  our 
marketable security investments in high quality credit 
instruments  as  specified  in  our  investment  policy 
guidelines.

Financing  Activities:  In  fiscal  2007,  exercises  of 
stock  options  provided  cash  proceeds  of  $158,000. 
In  fiscal  2006,  exercises  of  stock  options  provided 
cash proceeds of $340,000.

Off-Balance Sheet Arrangements: We do not have 
any  special  purpose  entities  or  off-balance  sheet 
financing arrangements.

Contractual Obligations: As of March 31, 2007, we had the following fixed obligations and commitments:

Operating lease obligations
Capital lease obligations (1)
Purchase obligations (2)
Contractual obligations(3)

  Total

Payments Due By Period

Total

Less than  
1 Year

1–3  
Years

3–5  
Years

More than  
5 Years

$ 2,211
125
298
324

$ 2,958

(In thousands)
$  928
85
—
104

$834
—
—
96

$ 1,117

$930

$449
40
298
99

$886

$   —
—
—
25

$25

(1)   The  above  amounts  represent  principal  payments  only  while  principal  and  interest  are  payable  through  a  fixed  monthly  payment  of 

approximately $4,000 and a fixed annual payment of $52,000.

(2)   This amount represents minimum commitments due under a third-party manufacturing agreement.
(3)   These amounts include payments for license, supply and consulting agreements.

REPLIGEN CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

Capital  Requirements:  Our  future  capital  require-
ments  will  depend  on  many  factors,  including  the  
following:
•   the success of our clinical studies;
•   the  scope  of  and  progress  made  in  our  research 

and development activities;

•   our ability to acquire additional product candidates;
•   the  success  of  any  proposed  financing  efforts; 

and

•   the ability to sustain sales and profits of our com-

mercial products.

Absent  an  acquisition  of  another  product  candidate, 
we  believe  our  current  cash  balances  are  adequate 
to meet our cash needs for at least the next twenty-
four  months.  We  expect  to  incur  an  increased  level 
of expense in fiscal 2008 compared to those incurred 
in fiscal 2007. This is due to anticipated increases in 
clinical  study  expenses  and  legal  fees  for  litigation  
in process currently, as well as increased personnel 
expenses.  Our  future  capital  requirements  include, 
but  are  not  limited  to,  continued  investment  in  our 
research and development programs, capital expen-
ditures primarily associated with purchases of equip-
ment  and  continued  investment  in  our  intellectual 
property portfolio.

We  plan  to  continue  to  invest  in  key  research  and 
development  activities.  We  continue  to  seek  to 
acquire  such  potential  assets  that  may  offer  us  the 
best  opportunity  to  create  value  for  our  sharehold-
ers.  In  order  to  acquire  such  assets,  we  may  need  
to  seek  additional  financing  to  fund  these  invest-
ments. This may require the issuance or sale of addi-
tional equity or debt securities. The sale of additional 
equity  may  result  in  additional  dilution  to  our  stock-
holders. Should we need to secure additional financ-
ing  to  acquire  a  product,  fund  future  investment  in 
research and development, or meet our future liquid-
ity requirements, we may not be able to secure such 
financing, or obtain such financing on favorable terms 
because  of  the  volatile  nature  of  the  biotechnology 
marketplace.

Net  Operating  Loss  Carryforwards:  At  March  31, 
2007,  we  had  net  operating  loss  carryforwards  of 
approximately  $100,130,000  and  research  and  
development  credit  carryforwards  of  approximately 
$5,270,000  to  reduce  future  federal  income  taxes,  
if  any.  The  net  operating  loss  and  tax  credit  carry-
forwards  have  expired  and  will  continue  to  expire  
at  various  dates,  beginning  in  fiscal  year  2008,  if  
not used. Net operating loss carryforwards and avail-
able  tax  credits  are  subject  to  review  and  possible 
adjustment by the Internal Revenue Service and may  
be  limited  in  the  event  of  certain  changes  in  the  
ownership  interest  of  significant  stockholders.  We 
did not record a tax provision in the fiscal year 2007  

statement of operations as we did not generate tax-
able income.

Effects of Inflation: Our assets are primarily mone-
tary,  consisting  of  cash,  cash  equivalents  and  mar-
ketable  securities.  Because  of  their  liquidity,  these 
assets  are  not  directly  affected  by  inflation.  Since  
we  intend  to  retain  and  continue  to  use  our  equip-
ment,  furniture  and  fixtures  and  leasehold  improve-
ments,  we  believe  that  the  incremental  inflation 
related  to  replacement  costs  of  such  items  will  not 
materially  affect  our  operations.  However,  the  rate  
of  inflation  affects  our  expenses,  such  as  those  for 
employee  compensation  and  contract  services, 
which  could  increase  our  level  of  expenses  and  the 
rate at which we use our resources.

Recent Accounting Pronouncements

Accounting  for  Uncertainty  in  Income  Taxes:  In 
June  2006,  the  Financial  Accounting  Standards 
Board  (“FASB”)  issued  FASB  Interpretation  No.  48, 
“Accounting  for  Uncertainty  in  Income  Taxes—an 
Interpretation  of  FASB  Statement  No.  109”  (the 
“Interpretation”).  The  Interpretation  clarifies  the 
accounting  for  uncertainty  in  income  taxes  recog-
nized in an enterprise’s financial statements in accord-
ance with FASB Statement No. 109, “Accounting for 
Income  Taxes.”  The  Interpretation  prescribes  a  rec-
ognition threshold and measurement attribute for the 
financial statement recognition and measurement of 
a tax position taken or expected to be taken in a tax 
return. This Interpretation also provides guidance on 
derecognition,  classification,  interest  and  penalties, 
accounting  in  interim  periods,  disclosure  and  transi-
tion.  The  Interpretation  is  effective  for  fiscal  years 
beginning  after  December  15,  2006.  The  Company 
has  not  yet  completed  its  evaluation  of  the 
Interpretation,  but  does  not  currently  believe  that 
adoption will have a material impact on its results of 
operations, financial position or cash flows.

Fair Value Measurements: In September 2006, the 
FASB  issued  FASB  Statement  No.  157,  “Fair  Value 
Measurements”  (“SFAS  No.  157”).  SFAS  No.  157 
establishes  a  common  definition  for  fair  value,  cre-
ates  a  framework  for  measuring  fair  value,  and 
expands  disclosure  requirements  about  such  fair 
value  measurements.  SFAS  No.  157  is  effective  for 
our first quarter of 2008. Management does not cur-
rently  believe  that  adoption  will  have  a  material 
impact on its results of operations, financial position 
or cash flows.

Fair Value Option for Financial Assets and Finan-
cial  Liabilities:  In  February  2007,  the  FASB  issued 
FASB  Statement  No.  159,  “The  Fair  Value  Option  
for Financial Assets and Financial Liabilities” (“SFAS 
No.  159”).  SFAS  No.  159  provides  companies  with  

2007 ANNUAL REPORT

F.15

F.16

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  
RESULTS OF OPERATIONS (continued)

an  option  to  report  selected  financial  assets  and  
liabilities at fair value. The objective of SFAS No. 159 
is to reduce both complexity in accounting for finan-
cial instruments and the volatility in earnings caused 
by  measuring  related  assets  and  liabilities  differ-
ently. Generally accepted accounting principles have 
required  different  measurement  attributes  for  dif-
ferent  assets  and  liabilities  that  can  create  artificial 
volatility  in  earnings.  FASB  has  indicated  it  believes 
that  SFAS  No.  159  helps  to  mitigate  this  type  of 
accounting-induced volatility by enabling companies 
to  report  related  assets  and  liabilities  at  fair  value, 
which  would  likely  reduce  the  need  for  companies  
to comply with detailed rules for hedge accounting. 
SFAS No. 159 also establishes presentation and dis-
closure requirements designed to facilitate compari-
sons  between  companies  that  choose  different 
measurement  attributes  for  similar  types  of  assets 
and  liabilities.  For  example,  SFAS  No.  159  requires 
companies  to  provide  additional  information  that  
will help investors and other users of financial state-
ments  to  more  easily  understand  the  effect  of  the 
company’s  choice  to  use  fair  value  on  its  earnings.  
It  also  requires  entities  to  display  the  fair  value  of 
those  assets  and  liabilities  for  which  the  company 
has  chosen  to  use  fair  value  on  the  face  of  the  bal-
ance sheet. SFAS No. 159 does not eliminate disclo-
sure  requirements  included  in  other  accounting 
standards,  including  requirements  for  disclosures 
about  fair  value  measurements  included  in  FASB 
Statement  No.  157,  “Fair  Value  Measurements” 
(“SFAS  No.  157”),  and  FASB  Statement  No.  107, 
“Disclosures  about  Fair  Value  of  Financial 
Instruments”  (“SFAS  No.  107”).  SFAS  No.  159  is 
effective as of the beginning of a company’s first fis-
cal  year  beginning  after  November  15,  2007.  Early 

adoption is permitted as of the beginning of the pre-
vious  fiscal  year  provided  that  the  company  makes 
that choice in the first 120 days of that fiscal year and 
also elects to apply the provisions of SFAS No. 157. 
The  Company  has  not  yet  completed  its  evaluation 
of  the  Interpretation,  but  does  not  currently  believe 
that adoption will have a material impact on its results 
of operations, financial position or cash flows.

Quantitative and Qualitative Disclosures about 
Market Risk

Interest  Rate  Risk:  We  have  investments  in  com-
mercial  paper,  U.S.  Government  and  agency  secu-
rities  as  well  as  corporate  bonds  and  other  debt 
securities.  As  a  result,  we  are  exposed  to  potential 
loss from market risks that may occur as a result of 
changes in interest rates, changes in credit quality of 
the issuer or otherwise.

We  generally  place  our  marketable  security  invest-
ments in high quality credit instruments, as specified 
in  our  investment  policy  guidelines.  A  hypothetical 
100  basis  point  decrease  in  interest  rates  would 
result in an approximate $55,000 decrease in the fair 
value  of  our  investments  as  of  March  31,  2007. 
However, the conservative nature of our investments 
mitigates our interest rate exposure, and our invest-
ment policy limits the amount of our credit exposure 
to any one issue, issuer (with the exception of U.S. 
Treasury  obligations)  and  type  of  instrument.  We  
do  not  expect  any  material  loss  from  our  market-
able security investments due to interest rate fluctu-
ations and therefore believe that our potential interest 
rate  exposure  is  limited.  We  intend  to  hold  these 
investments to maturity, in accordance with our busi-
ness plans.

MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND  
ISSUER PURCHASES OF EQUITY SECURITIES

Market Information
Our  common  stock  is  traded  on  the  Nasdaq  Global 
Market  under  the  symbol  “RGEN.”  The  following 
table sets forth for the periods indicated the high and 
low closing prices for the common stock as reported 
by Nasdaq.

Fiscal Year
2007

Fiscal Year
2006

High

Low

High

Low

$3.82
$3.40
$3.41
$3.30

$2.58
$2.27
$2.70
$2.80

$2.45
$4.00
$4.00
$4.99

$1.67
$1.99
$2.80
$3.43

First Quarter
Second Quarter
Third Quarter
Fourth Quarter

Stockholders and Dividends
As  of  June  1,  2007,  there  were  approximately  790 
stockholders  of  record  of  our  common  stock.  We 
have not paid any dividends since our inception and  
do  not  intend  to  pay  any  dividends  on  our  common 
stock in the foreseeable future. We anticipate that we 
will retain all earnings, if any, to support our operations 
and our proprietary drug development programs. Any 
future determination as to the payment of dividends 
will be at the sole discretion of our Board of Directors 
and will depend on our financial condition, results of 
operations,  capital  requirements  and  other  factors 
our Board of Directors deems relevant.

REPLIGEN CORPORATION

160

140

120

100

80

60

40

20

0

STOCK PRICE PERFORMANCE GRAPH

The  following  graph  compares  the  yearly  percent-
age change in the cumulative total stockholder return 
(change  in  stock  price  plus  reinvested  dividends) 
on  Repligen’s  common  stock  with  the  cumulative 
total  return  for  the  Nasdaq  Stock  Market  Index 
(U.S.)  (the  “Nasdaq  Composite  Index”)  and  the 
Nasdaq  Pharmaceutical  Stock  Index  (the  “Nasdaq 
Pharmaceutical Index”). The comparisons in the graph 
are required by the SEC and are not intended to fore-
cast or be indicative of possible future performance of 
Repligen’s common stock.

100

124.50

80.93

71.19

108.56

109.31

129.50

119.86

106.60

80.78

98.47

98.64

136.19

110.83

84.24

45.32

$160

140

120

100

80

60

40

20

0

* Assumes  $100  invested  on  March  31,  2002  in  each  of  Repligen 
Corporation’s  Common  Stock,  the  securities  comprising  the  Nasdaq 
Composite  Index  and  the  securities  comprising  the  Nasdaq 
Pharmaceutical Index.

3/02

3/03

3/04

3/05

3/06

3/07

Repligen Corporation

NASDAQ Composite

NASDAQ Phamarceutical

STATEMENTS OF OPERATIONS

Revenue:
  Product revenue
  Other revenue

  Total revenue

Operating expenses (1):
  Cost of product revenue
  Research and development
  Selling, general and administrative

  Total operating expenses

  Loss from operations
Investment income
Interest expense
Other income

Net income (loss)

Basic and diluted (loss) earnings per share

Weighted average shares outstanding:
  Basic

  Diluted

(1)  Includes non-cash stock-based compensation as follows:

Cost of product revenue
Research and development
Selling, general and administrative

See accompanying notes.

2007 ANNUAL REPORT

Years ended March 31,

F.17

2007

2006

2005

$ 13,073,894
1,000,345

$ 12,529,404
382,000

$  9,360,309
—

14,074,239

  12,911,404

9,360,309

3,614,837
5,924,439
6,360,292

3,550,861
5,163,098
5,417,339

3,887,802
5,036,766
4,597,085

15,899,568

13,521,653
14,131,298
$ (1,825,329) $ (1,219,894) $ (4,161,344)
427,770
—
750,000

750,156
(3,010)
1,169,608

947,547
(11,481)
—

$ 

$ 

(889,263) $ 

696,860

$ (2,983,574)

(0.03) $ 

0.02

$ 

(0.10)

30,379,350

30,125,041

30,061,812

30,379,350

30,690,941

30,061,812

$ 
$ 
$ 

25,655
228,597
582,280

$ 
$ 
$ 

20,650

— $ 
$ 
— $ 

—
23,603
—

 
 
BALANCE SHEETS

Assets
Current assets:
  Cash and cash equivalents
  Marketable securities
  Accounts receivable, less reserve of $10,000 for 2007 and 2006

Inventories

  Prepaid expenses and other current assets

  Total current assets

Property, plant and equipment, at cost:
  Leasehold improvements
  Equipment
  Furniture and fixtures

  Less-accumulated depreciation and amortization

Long-term marketable securities
Restricted cash

  Total assets

Liabilities and stockholders’ equity
Current liabilities:
  Accounts payable
  Accrued liabilities

F.18

  Total current liabilities

  Long-term liabilities

  Total liabilities

Commitments and contingencies
Stockholders’ equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized,  

no shares issued or outstanding

Common stock, $.01 par value authorized, 40,000,000 shares  

outstanding, 30,477,635 shares at March 31, 2007 and  
30,377,635 shares at March 31, 2006

Additional paid-in capital
Deferred compensation
Accumulated deficit

  Total stockholders’ equity

  Total liabilities and stockholders’ equity

See accompanying notes.

As of March 31,

2007

2006

$ 

7,726,505
14,900,840
1,143,694
1,514,571
445,415

$ 

5,428,477 
13,447,600
593,725
1,465,592
575,038

25,731,025

21,510,432

3,212,916
2,353,667
191,356

5,757,939
(2,613,081)

3,144,858
—
200,000

2,475,169
1,769,367
186,874

4,431,410
(2,074,049)

2,357,361
4,531,548
200,000

$  29,075,883

$  28,599,341 

$ 

1,161,504
2,175,739

3,337,243
200,342

3,537,585

$ 

1,066,445 
1,869,349

2,935,794
230,518

3,166,312

—

—

304,776
182,916,856
—
(157,683,334)

303,776
181,985,274
(61,950)
(156,794,071)

25,538,298

25,433,029

$  29,075,883

$  28,599,341

REPLIGEN CORPORATION

 
 
 
 
 
 
 
STATEMENTS OF CASH FLOWS

Cash flows from operating activities:
  Net (loss) income:

 Adjustments to reconcile net (loss) income to net cash 

provided by (used in) operating activities:
Issuance of common stock for service

  Depreciation and amortization
  Stock-based compensation expense
  Loss on disposal of assets
  Bad debt reserve

  Changes in assets and liabilities:

  Accounts receivable

Inventories

  Prepaid expenses and other current assets
  Accounts payable
  Accrued liabilities
  Long-term liabilities

  Net cash (used in) provided by operating activities

Cash flows from investing activities:
  Purchases of marketable securities
  Redemptions of marketable securities
  Purchases of property, plant and equipment

Years ended March 31,

2007

2006

2005

$ 

(889,263) $ 

696,860

$  (2,983,574)

—
539,032
836,532
—
—

(549,969)
(48,979)
106,827
95,059
346,419
(30,176)

405,482

85,750
398,434
20,650
18,369
(5,000)

175,507
(832,278)
133,906
49,487
(327,805)
1,504

—
756,258
23,603
(20,000)
—

228,017
246,067
(252,633)
302,667
577,203
9,787

415,385

(1,112,605)

$(13,973,896)
17,075,000
(1,326,529)

(11,383,595)
13,583,000
(735,495)

(16,904,423)
17,301,991
(52,658)

  Net cash provided by investing activities

1,774,575

1,463,910

344,910

Cash flows from financing activities:
  Exercise of stock options
  Principal payments under capital lease obligation

  Net cash provided by financing activities

158,000
(40,029)

117,971

340,111
(7,609)

332,502

30,501
(4,802)

25,699

F.19

Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents, beginning of period

2,298,028
$  5,428,477

2,211,796
$  3,216,681

(741,996)
$  3,958,677

Cash and cash equivalents, end of period

$  7,726,505

$  5,428,477

$  3,216,681

Supplemental disclosure of noncash activities:
Purchase of Capital Lease Equipment

Reclassification of Deferred Compensation

Recording of Deferred Compensation

Disposal of fully depreciated equipment

See accompanying notes.

$ 

$ 

$ 

$ 

— $ 

133,261

$ 

33,605

61,950

$ 

— $ 

— $ 

82,600

— $ 

109,339

$ 

$ 

—

—

283,505

2007 ANNUAL REPORT

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
STATEMENTS OF STOCKHOLDERS’ EQUITY

Common Stock

Number of 
Shares

Amount

Additional 
Paid-in Capital

Deferred 
Compen-
sation

Accumulated 
Deficit

Stockholders’ 
Equity

Balance at March 31, 2004 30,036,085 $ 300,361 $ 181,394,602 $ (23,603) $ (154,507,357) $ 27,164,003

Exercise of stock options
Compensation expense 
related to issuance of 
stock options

Amortization of deferred 

compensation

Net loss

58,350

583

29,918

—

—

—

—

30,501

55,125

55,125

— 23,603
—
—

—
(2,983,574)

23,603
(2,983,574)

—

—
—

—

—
—

Balance at March 31, 2005 30,094,435 $ 300,944 $ 181,479,645 $ 

— $ (157,490,931) $ 24,289,658

Issuance of common stock 

for services

Deferred compensation 
related to employee 
stock options

Amortization of deferred 

compensation

Exercise of stock options
Net income

25,000

250

85,500

—

20,000

200

82,600

(82,600)

—

—

—
238,200
—

—
2,382
—

— 20,650
—
—

337,529
—

—
—
696,860

85,750

200

20,650
339,911
696,860

Balance at March 31, 2006 30,377,635 $ 303,776 $ 181,985,274 $ (61,950) $ (156,794,071) $ 25,433,029

Reclassification of deferred 

compensation

Share-based compensa-

tion expense

Repurchase and retirement 

of treasury stock

Exercise of stock options
Net loss

—

—

—

—

(10,000)
110,000
—

(100)
1,100
—

(61,950)

61,950

836,532

100
156,900
—

—

—
—
—

—

—

—
—
(889,263)

—

836,532

—
158,000
(889,263)

Balance, March 31, 2007

30,477,635 $ 304,776 $ 182,916,856 $ 

— $ (157,683,334) $ 25,538,298

See accompanying notes.

F.20

REPLIGEN CORPORATION

NOTES TO FINANCIAL STATEMENTS

1. Organization and Nature of Business
Repligen Corporation (“Repligen” or the “Company”) 
is  a  biopharmaceutical  company  focused  on  the 
development of novel therapeutics for the treatment 
of diseases of the central nervous system. A number 
of  drug  development  programs  are  currently  being 
conducted  to  evaluate  the  Company’s  naturally 
occurring drug candidates in diseases such as bipo-
lar  disorder  and  neurodegeneration.  In  addition, 
Repligen  sells  two  commercial  products,  Protein  A 
for  monoclonal  antibody  purification  and  SecreFlo® 
for assessment of pancreatic disorders.

The  Company’s  business  strategy  is  to  deploy  the 
profits  from  its  commercial  products  and  any  reve-
nue that it may receive from its patents to enable the 
Company  to  invest  in  the  development  of  product 
candidates in the treatment area of neuropsychiatric 
diseases.

The  Company  is  subject  to  a  number  of  risks  typi-
cally  associated  with  companies  in  the  biotechnol-
ogy  industry.  Principally  those  risks  are  associated 
with  the  Company’s  dependence  on  collaborative 
arrangements,  development  by  the  Company  or  its 
competitors  of  new  technological  innovations, 
dependence on key personnel, protection of proprie-
tary technology, compliance with the U.S. Food and 
Drug Administration and other governmental regula-
tions and approval requirements, as well as the abil-
ity  to  grow  the  Company’s  business  and  obtain 
adequate funding to finance this growth.

2. Summary of Significant Accounting Policies

Use of Estimates
The preparation of financial statements in conformity 
with  U.S.  generally  accepted  accounting  principles 
requires  management  to  make  estimates  and 
assumptions  that  affect  the  reported  amounts  of 
assets  and  liabilities  and  disclosure  of  contingent 
assets and liabilities at the date of the financial state-
ments  and  the  reported  amounts  of  revenues  and 
expenses during the reporting period. Actual results 
could differ from those estimates.

Revenue Recognition
The  Company  applies  Staff  Accounting  Bulletin  No. 
104, “Revenue Recognition” (“SAB No. 104”) to its 
revenue arrangements.

The Company generates product revenues from the 
sale of Protein A products to customers in the phar-
maceutical  and  process  chromatography  industries 
and  from  the  sale  of  SecreFlo®  to  hospital-based 
gastroenterologists.  In  accordance  with  SAB  No. 
104,  the  Company  recognizes  revenue  related  to 
product  sales  upon  delivery  of  the  product  to  the  

customer as long as there is persuasive evidence of  
an arrangement, the sales price is fixed or determin-
able  and  collection  of  the  related  receivable  is  rea-
sonably  assured.  Determination  of  whether  these 
criteria have been met are based on management’s 
judgments primarily regarding the fixed nature of the 
fee  charged  for  product  delivered,  and  the  collect-
ibility  of  those  fees.  The  Company  has  a  few  long-
standing  customers  who  comprise  the  majority  of 
product revenue and have excellent payment history. 
The  Company  has  had  no  significant  write-offs  of 
uncollectible  invoices  in  the  periods  presented. 
Should changes in conditions cause management to 
determine that these criteria are not met for certain 
future  transactions,  revenue  recognized  for  any 
reporting period could be adversely affected.

At the time of sale, the Company also evaluates the 
need  to  accrue  for  warranty  and  sales  returns.  The 
supply  agreements  the  Company  has  with  its  cus-
tomers  and  related  purchase  orders  identify  the 
terms  and  conditions  of  each  sale  and  the  price  of 
the  goods  ordered.  Due  to  the  nature  of  the  sales 
arrangements, inventory produced for sale is tested 
for quality specifications prior to shipment. Since the 
product is manufactured to order and in compliance 
with  required  specifications  prior  to  shipment,  the 
likelihood of sales return, warranty or other issues is 
largely diminished. Sales returns and warranty issues 
are  infrequent  and  have  had  nominal  impact  on  the 
Company’s  financial  statements  historically.  Should 
changes  in  conditions  cause  management  to  deter-
mine  that  warranty,  returns  or  other  sale-related 
reserves  are  necessary  for  certain  future  transac-
tions,  revenue  recognized  for  any  reporting  period 
could be adversely affected.

During  the  fiscal  year  ended  March  31,  2007,  the 
Company  recognized  $825,000  of  revenue  from  a 
sponsored  research  and  development  project  under 
an  agreement  with  the  Stanley  Medical  Research 
Institute  (“SMRI”).  Research  revenue  is  recognized 
on a cost plus fixed-fee basis when the expense has 
been  incurred  and  services  have  been  performed. 
Determination  of  which  costs  incurred  qualify  for 
reimbursement  under  the  terms  of  the  contractual 
agreement and the timing of when such costs were 
incurred involves the judgment of management. The 
Company  believes  its  calculations  are  based  upon 
the agreed-upon terms as stated in the arrangement. 
However,  should  the  estimated  calculations  change 
or be challenged by SMRI, research revenue may be 
adjusted  in  subsequent  periods.  The  calculations 
have not historically changed or been challenged and 
the  Company  does  not  anticipate  any  subsequent 
change  in  its  revenue  related  to  this  sponsored 
research and development project.

2007 ANNUAL REPORT

F.21

F.22

NOTES TO FINANCIAL STATEMENTS (continued)

Additionally,  during  fiscal  year  2007,  the  Company 
earned  and  recognized  approximately  $175,000  in 
royalty  revenue  from  ChiRhoClin,  Inc.  Revenues 
earned from ChiRhoClin royalties are recorded in the 
periods  when  they  are  earned  based  on  royalty 
reports sent by ChiRhoClin to the Company.

There  have  been  no  material  changes  to  the  Com-
pany’s  initial  estimates  related  to  revenue  recogni-
tion  in  any  periods  presented  in  the  accompanying 
financial statements.

Risks and Uncertainties
The Company evaluates its operations periodically to 
determine  if  any  risks  and  uncertainties  exist  that 
could  impact  its  operations  in  the  near  term.  The 
Company does not believe that there are any signifi-
cant risks which have not already been disclosed in 
the  financial  statements.  However,  the  Company 
does  rely  on  a  single  supplier  for  SecreFlo®  materi-
als.  Although  alternate  sources  of  supply  exist  for 
these  items,  loss  of  certain  suppliers  could  tempo-
rarily  disrupt  operations.  The  Company  attempts  to 
mitigate these risks by working closely with key sup-
pliers,  identifying  alternate  sources  and  developing 
contingency plans.

Comprehensive Income
The Company applies Statement of Financial Account-
ing Standards (“SFAS”) No. 130, “Reporting Compre-
hensive Income.” SFAS No. 130 requires disclosure 
of  all  components  of  comprehensive  income  on  an 
annual  and  interim  basis.  Comprehensive  income  is 
defined as the change in equity of a business enter-
prise  during  a  period  from  transactions  and  other 

events  and  circumstances  from  nonowner  sources. 
The  Company’s  comprehensive  income  (loss)  is 
equal to its reported net income (loss) for all periods 
presented.

Cash Equivalents and Marketable Securities
The Company applies SFAS No. 115, “Accounting for 
Certain Investments in Debt and Equity Securities.” 
At  March  31,  2007,  the  majority  of  the  Company’s 
cash  equivalents  and  marketable  securities  are  
classified  as  held-to-maturity  investments  as  the 
Company has the positive intent and ability to hold to 
maturity. As a result, these investments are recorded 
at  amortized  cost.  Marketable  securities  are  invest-
ments  with  original  maturities  of  greater  than  90 
days.  Long-term  marketable  securities  are  invest-
ment grade securities with maturities of greater than 
one year.

At March 31, 2007, marketable securities also include 
investment grade auction rate securities, which pro-
vide higher yields than money market and other cash 
equivalent investments. Auction rate securities have 
long-term  underlying  maturities,  but  have  interest 
rates  that  are  reset  every  90  days  or  less,  at  which 
time  the  securities  can  typically  be  purchased  or 
sold,  which  creates  a  highly  liquid  market  for  these 
securities.  The  Company  does  not  intend  to  hold 
these  securities  to  maturity,  but  rather  to  use  the 
securities  to  provide  liquidity  as  necessary.  Auction 
rate securities are classified as available-for-sale and 
reported  at  fair  value.  Due  to  the  reset  feature  and 
their carrying value equaling their fair value, there are 
no unrealized gains or losses from these short-term 
investments.

Cash equivalents and marketable securities consist of the following at March 31, 2007 and 2006:

Cash and cash equivalents
Marketable securities:
  U.S. Government and agency securities
  Auction Rate Securities
  Corporate and other debt securities

Long-term marketable securities:
  U.S. Government and agency securities
  Corporate and other debt securities

As of March 31,

Unrealized Holding Loss 
Year ended March 31,

2007

2006

2007

2006

$  7,726,505

$  5,428,477

$ 

— $ 

—

3,460,665
475,000
10,965,175

8,048,129
1,075,000
4,324,471

(8,273)
—
(9,877)

(64,571)
—
—

$ 14,900,840

$ 13,447,600

$ (18,150)

$ (64,571)

—
—

1,900,000
2,631,548

—
—

(25,328)
(38,915)

$ 

— $  4,531,548

$ 

— $ (64,243)

Restricted cash of $200,000 is related to the Company’s facility lease obligation.

Average of remaining maturity of approximately 5 months at March 31, 2007. Assumes auction rate maturity set at date of 
next auction.

REPLIGEN CORPORATION

NOTES TO FINANCIAL STATEMENTS (continued)

Fair Value of Financial Instruments
The  carrying  amounts  of  the  Company’s  financial 
instruments which represent cash, marketable secu-
rities, and accounts receivable generally approximate 
fair  value  due  to  the  short-term  nature  of  these 
instruments.

Concentrations of Credit Risk and  
Significant Customers
Financial  instruments  that  subject  the  Company  to 
significant concentrations of credit risk primarily con-
sist of cash and cash equivalents, marketable securi-
ties  and  accounts  receivable.  The  Company’s  cash 
equivalents and marketable securities are invested in 
financial instruments with high credit ratings and by 
policy limits the amount of its credit exposure to any 
one issue, issuer, (with the exception of U.S. Treasury 
obligations)  and  type  of  instrument.  At  March  31, 
2007,  the  Company  has  no  items  such  as  those 
associated with foreign exchange contracts, options 
contracts or other foreign hedging arrangements.

Concentration of credit risk with respect to accounts 
receivable  is  limited  to  customers  to  whom  the 
Company  makes  significant  sales.  The  Company 
maintains  reserves  for  the  potential  write-off  of 
accounts  receivable.  To  date,  the  Company  has  not 
written off any significant accounts. To control credit 
risk,  the  Company  performs  regular  credit  evalua-
tions of its customers’ financial condition.

Revenue from significant customers as a percentage 
of the Company’s total revenue is as follows:

Customer A
Customer B
Customer C

Years ended  
March 31,

2007

2006

2005

49% 49% 54%
*% 10%
23% 26% 13%

*%

Inventories
Inventories  relate  to  the  Company’s  Protein  A  busi-
ness.  The  Company  values  inventory  at  cost  or,  if 
lower,  fair  market  value.  Repligen  determines  cost 
using  the  first-in,  first-out  method.  The  Company 
reviews its inventories at least quarterly and records 
a provision for excess and obsolete inventory based 
on  its  estimates  of  expected  sales  volume,  produc-
tion  capacity  and  expiration  dates  of  raw  materials, 
work-in-process and finished goods. Expected sales 
volumes  are  determined  based  on  supply  forecasts 
provided  by  key  customers  for  the  next  three  to 
twelve  months.  The  Company  writes  down  inven-
tory that has become obsolete, inventory that has a 
cost  basis  in  excess  of  its  expected  net  realizable 
value,  and  inventory  in  excess  of  expected  require-
ments  to  cost  of  goods  sold.  Manufacturing  of 
Protein A finished goods is done to order and tested 
for quality specifications prior to shipment.

A  change  in  the  estimated  timing  or  amount  of 
demand  for  our  products  could  result  in  additional 
provisions  for  excess  inventory  quantities  on  hand. 
Any  significant  unanticipated  changes  in  demand  or 
unexpected  quality  failures  could  have  a  significant 
impact on the value of inventory and reported oper-
ating  results.  During  all  periods  presented  in  the 
accompanying  financial  statements,  there  has  been 
no material adjustments related to a revised estimate 
of inventory valuations.

Inventories  are  stated  at  the  lower  of  cost  (first-in, 
first-out)  or  market.  Work-in-process  and  finished 
goods  inventories  consist  of  material,  labor,  outside 
processing  costs  and  manufacturing  overhead. 
Inventories  at  March  31,  2007  and  2006  consist  of 
the following:

F.23

As of March 31,

2007

2006

$  733,112
616,519
164,940

$  600,948
596,386
268,258

$ 1,514,571

$ 1,465,592

* Represents less than 10% of total revenue for the period.

Significant  accounts  receivable  balances  as  a  per-
centage  of  the  Company’s  total  trade  accounts 
receivable balances are as follows:

Raw materials
Work-in-process
Finished goods

  Total

Customer A
Customer B
Customer C
Customer D

As of  
March 31,

2007

2006

15% 25%
*% 13%
*% 11%
47% 25%

* Did  not  represent  10%  of  total  accounts  receivable  at  March  31, 

2007.

Depreciation and Amortization
Depreciation  and  amortization  are  calculated  using 
the  straight-line  method  over  the  estimated  useful 
life of the asset as follows:

Description

Estimated Useful Life

Leasehold improvements

Shorter of term of the lease 
or estimated useful life

Equipment
Furniture and fixtures

3–5 years
5 years

2007 ANNUAL REPORT

F.24

NOTES TO FINANCIAL STATEMENTS (continued)

The  Company  recorded  depreciation  and  amortiza-
tion  of  property,  plant  and  equipment  expense  of 
$539,032,  $398,434  and  $363,738  in  2007,  2006 
and 2005, respectively. Depreciation of assets under 
capital  leases  is  included  in  depreciation  and  amor-
tization.  The  amount  of  depreciation  recorded  for 
assets  under  capital  lease  agreements  for  fiscal 
years  2007,  2006  and  2005  was  $41,850,  $16,268 
and $4,721, respectively.

Earnings Per Share
The Company applies the provisions of Statement of 
Financial  Accounting  Standard  (“SFAS”)  No.  128, 
“Presenting Earnings Per Share.” Basic earnings per 
share  for  the  periods  ended  March  31,  2007,  2006 
and  2005  were  computed  on  the  basis  of  the 
weighted  average  number  of  shares  of  common 
stock outstanding during the period. Diluted earnings 
per share is computed on the basis of the weighted 
average number of shares of common stock plus the 
effect of dilutive potential common shares outstand-
ing during the period using the treasury stock method 
in accordance with SFAS No. 128. Dilutive potential 
common shares include outstanding stock options.

Basic and diluted weighted average shares outstand-
ing were as follows:

Twelve Months ended March 31,

2007

2006

2005

Weighted aver-
age common 
shares  
outstanding
Dilutive com-
mon stock 
options

Weighted aver-
age common 
shares out-
standing, 
assuming 
dilution

30,379,350

30,125,041

30,061,812

—

565,900

—

30,379,350

30,690,941

30,061,812

Diluted  weighted  average  shares  outstanding  for 
2007 does not include the potential common shares 
for  stock  options  because  to  do  so  would  be  anti-
dilutive.  Accordingly,  basic  and  diluted  net  loss  per 
share is the same. The number of potential common 
shares excluded from the calculation of diluted earn-
ings per share during the year ended March 31, 2007 
was 2,292,750.

For the year ended March 31, 2006, options to pur-
chase  955,400  shares  were  excluded  from  the  
calculation  of  diluted  earnings  per  share  because  
the  exercise  prices  of  the  stock  options  were  
greater  than  or  equal  to  the  average  price  of  the  
common shares.

Diluted  weighted  average  shares  outstanding  for 
2005  do  not  include  the  potential  common  shares 
from  warrants  and  stock  options  because  to  do  so 
would have been antidilutive. Accordingly, basic and 
diluted  net  loss  per  share  is  the  same.  The  number 
of  potential  common  shares  excluded  from  the  cal-
culation of diluted earnings per share during the year 
ended March 31, 2005 was 2,166,900.

Segment Reporting
The  Company  applies  SFAS  No.  131,  “Disclosures 
about  Segments  of  an  Enterprise  and  Related  Infor-
mation.”  SFAS  No.  131  establishes  standards  for 
reporting  information  regarding  operating  segments 
in annual financial statements and requires selected 
information  for  those  segments  to  be  presented  in 
interim  financial  reports  issued  to  stockholders. 
SFAS No. 131 also establishes standards for related 
disclosures  about  products  and  services  and  geo-
graphic  areas.  The  chief  operating  decision  maker,  
or  decision-making  group,  in  making  decisions  how 
to allocate resources and assess performance, iden-
tifies  operating  segments  as  components  of  an 
enterprise  about  which  separate  discrete  financial 
information  is  available  for  evaluation.  To  date,  the 
Company has viewed its operations and manages its 
business as one operating segment. As a result, the 
financial  information  disclosed  herein  represents  all 
of  the  material  financial  information  related  to  the 
Company’s principal operating segment.

The following table represents the Company’s reve-
nue by geographic area (based on the location of the 
customer):

Europe
United States
Other

  Total

Year ended March 31,

2007

2006

2005

  52%   51%   56%
  47%   48%   43%
    1%     1%     1%

100% 100% 100%

The following table represents the Company’s prod-
uct revenue by product type:

Year ended March 31,

2007

2006

2005

Protein A
SecreFlo®
Other product revenue

$ 11,127
1,947
—

$ 10,540
1,989
—

$ 7,134
2,189
37

  Product revenue

$ 13,074

$ 12,529

$ 9,360

As of March 31, 2007 and 2006, all of the Company’s 
assets are located in the United States.

REPLIGEN CORPORATION

NOTES TO FINANCIAL STATEMENTS (continued)

Recent Accounting Pronouncements

Accounting  for  Uncertainty  in  Income  Taxes:  In 
June  2006,  the  Financial  Accounting  Standards 
Board  (FASB)  issued  FASB  Interpretation  No.  48, 
“Accounting  for  Uncertainty  in  Income  Taxes—an 
Interpretation  of  FASB  Statement  No.  109”  (the 
“Interpretation”).  The  Interpretation  clarifies  the 
accounting  for  uncertainty  in  income  taxes  recog-
nized in an enterprise’s financial statements in accor-
dance  with  FASB  Statement  No.  109,  “Accounting 
for  Income  Taxes.”  The  Interpretation  prescribes  a 
recognition threshold and measurement attribute for 
the  financial  statement  recognition  and  measure-
ment of a tax position taken or expected to be taken 
in a tax return. This Interpretation also provides guid-
ance  on  derecognition,  classification,  interest  and 
penalties,  accounting  in  interim  periods,  disclosure 
and transition. The Interpretation is effective for fis-
cal  years  beginning  after  December  15,  2006.  The 
Company has not yet completed its evaluation of the 
Interpretation,  but  does  not  currently  believe  that 
adoption will have a material impact on its results of 
operations, financial position or cash flows.

Fair Value Measurements: In September 2006, the 
FASB  issued  FASB  Statement  No.  157,  “Fair  Value 
Measurements”  (“SFAS  No.  157”).  SFAS  No.  157 
establishes  a  common  definition  for  fair  value,  cre-
ates  a  framework  for  measuring  fair  value,  and 
expands  disclosure  requirements  about  such  fair 
value  measurements.  SFAS  No.  157  is  effective  for 
our first quarter of 2008. Management does not cur-
rently  believe  that  adoption  will  have  a  material 
impact on its results of operations, financial position 
or cash flows.

Fair Value Option for Financial Assets and Finan-
cial  Liabilities:  In  February  2007,  the  FASB  issued 
FASB Statement No. 159, “The Fair Value Option for 
Financial Assets and Financial Liabilities” (“SFAS No. 
159”).  SFAS  No.  159  provides  companies  with  an 
option  to  report  selected  financial  assets  and  liabili-
ties at fair value. The objective of SFAS No. 159 is to 
reduce  both  complexity  in  accounting  for  financial 
instruments  and  the  volatility  in  earnings  caused  by 
measuring  related  assets  and  liabilities  differently. 
Generally  accepted  accounting  principles  have 
required different measurement attributes for differ-
ent assets and liabilities that can create artificial vola-
tility in earnings. FASB has indicated it believes that 
SFAS No. 159 helps to mitigate this type of account-
ing-induced volatility by enabling companies to report 
related assets and liabilities at fair value, which would 
likely reduce the need for companies to comply with 
detailed  rules  for  hedge  accounting.  SFAS  No.  159  

also establishes presentation and disclosure require-
ments  designed  to  facilitate  comparisons  between 
companies that choose different measurement attri-
butes  for  similar  types  of  assets  and  liabilities.  For 
example,  SFAS  No.  159  requires  companies  to  pro-
vide  additional  information  that  will  help  investors 
and  other  users  of  financial  statements  to  more  
easily understand the effect of the company’s choice 
to use fair value on its earnings. It also requires enti-
ties to display the fair value of those assets and liabil-
ities  for  which  the  company  has  chosen  to  use  fair 
value  on  the  face  of  the  balance  sheet.  SFAS  No. 
159  does  not  eliminate  disclosure  requirements 
included  in  other  accounting  standards,  including 
requirements  for  disclosures  about  fair  value  mea-
surements  included  in  FASB  Statement  No.  157, 
“Fair  Value  Measurements”  (“SFAS  No.  157”),  and 
FASB  Statement  No.  107,  “Disclosures  about  Fair 
Value of Financial Instruments” (“SFAS No. 107”). 
SFAS  No.  159  is  effective  as  of  the  beginning  of  a 
company’s first fiscal year beginning after November 
15, 2007. Early adoption is permitted as of the begin-
ning  of  the  previous  fiscal  year  provided  that  the 
company  makes  that  choice  in  the  first  120  days  
of that fiscal year and also elects to apply the provi-
sions  of  SFAS  No.  157.  The  Company  has  not  yet 
completed  its  evaluation  of  the  Interpretation,  but 
does  not  currently  believe  that  adoption  will  have  a 
material impact on its results of operations, financial 
position or cash flows.

Stock-Based Compensation
In  December  2004,  the  Financial  Accounting 
Standards  Board  (“FASB”)  issued  SFAS  No.  123R, 
“Share-Based  Payment—An  Amendment  of  FASB 
Statements  No.  123  and  95,”  (“SFAS  No.  123R”), 
which requires all companies to measure compensa-
tion  cost  for  all  share-based  payments,  including 
employee stock options, at fair value. Generally, the 
approach in SFAS No. 123R is similar to the approach 
described  in  SFAS  No.  123,  “Accounting  for  Stock-
Based Compensation,” (“SFAS No. 123”). However, 
SFAS No. 123R requires all share-based payments to 
employees,  including  grants  of  employee  stock 
options, to be recognized in the financial statements 
based  on  their  fair  value  over  the  requisite  service 
period. Pro forma disclosure is no longer an alterna-
tive. In March 2005, the SEC issued Staff Accounting 
Bulletin  (“SAB”)  No.  107  (“SAB  No.  107”),  which 
expressed the views of the SEC regarding the interac-
tion  between  SFAS  No.  123R  and  certain  rules  and 
regulations of the SEC. SAB No. 107 provides guid-
ance related to the valuation of share-based payment 
arrangements for public companies, including assump-
tions such as expected volatility and expected term.

2007 ANNUAL REPORT

F.25

NOTES TO FINANCIAL STATEMENTS (continued)

Prior  to  the  adoption  of  SFAS  No.  123R,  the  Com-
pany  applied  SFAS  No.  123,  “Accounting  for  Stock-
Based Compensation,” amended by SFAS No.  148, 
“Accounting  for  Stock-Based  Compensation—Tran-
sition  and  Disclosure,”  which  allowed  companies  
to  apply  the  existing  accounting  rules  under  APB 
Opinion No. 25. Pursuant to APB Opinion No. 25, the 
Company  accounted  for  its  stock-based  awards  to 
employees  using  the  intrinsic-value  method,  under 
which  compensation  expense  was  measured  on  
the date of grant as the difference between the fair 
value  of  the  Company’s  common  stock  and  the 
option  exercise  price  multiplied  by  the  number  of 
options  granted.  Generally,  the  Company  granted 
stock options with exercise prices equal to the esti-
mated  fair  value  of  its  common  stock;  however,  to 
the  extent  that  the  fair  value  of  the  common  stock 
exceeded the exercise price of stock options granted 
to  employees  on  the  date  of  grant,  the  Company 
recorded  deferred  compensation  and  amortized  the 
expense  over  the  vesting  schedule  of  the  options, 
generally  four  years.  During  the  years  ended 
March  31,  2006  and  2005,  in  accordance  with  APB 
Opinion  No.  25,  the  Company  recorded  deferred 
stock-based  compensation  resulting  from  the  grant 
of  employee  stock  options  with  an  exercise  price 
less  than  the  fair  value  of  common  stock.  As  of 
March  31,  2006,  the  Company  had  $ 61,950  of 
deferred stock-based compensation remaining to be 
amortized. Upon the adoption of SFAS No. 123R on 
April  1,  2006,  the  deferred  stock-based  compensa-
tion  balance  was  netted  against  additional  paid-in 
capital on the consolidated balance sheet and state-
ment of stockholders’ equity.

The  following  table  illustrates  the  effect  on  net 
income  and  net  income  per  share  if  the  Company 
had  applied  the  fair  value  recognition  provisions  of 
SFAS No. 123 to options granted under the Plans for 
the  fiscal  years  ended  March  31,  2005  and  2006. 
Since stock-based compensation expense for the fis-
cal  years  ended  March  31,  2007  was  calculated 
under the provisions of SFAS No. 123R, there is no 
disclosure  of  pro  forma  net  income  and  net  income 
per  share  for  that  period.  For  purposes  of  the  pro 
forma  disclosure  for  the  fiscal  years  ended  March 
31, 2005 and 2006 set forth in the table below, the 
value  of  the  options  is  estimated  using  a  Black-
Scholes  option  pricing  model  and  amortized  on  a 
straight-line basis to expense over the options’ vest-
ing periods.

Net income (loss) as 

reported

Add: Stock-based employee 

compensation cost 
included in reported net 
income (loss)

Deduct: Stock-based 

employee compensation 
cost that would have 
been included in the 
determination of net loss 
as reported if the fair 
value method had been 
applied to all awards

Year ended March 31, 

2006

2005

$ 696,860

$(2,983,574)

20,650

8,042

(745,043)

(980,240)

Pro forma net (loss)

$  (27,533)

$(3,955,772)

Basic and diluted net 

income (loss) per com-
mon share, as reported

Basic and diluted net 

income (loss) per com-
mon share, as pro forma

$       0.02

$             (0.10)

$             — $            (0.13)

Effective  April  1,  2006,  the  Company  adopted  the 
fair  value  recognition  provisions  of  SFAS  No.  123R, 
using  the  modified  prospective  transition  method. 
Under  this  transition  method,  compensation  cost 
recognized in the statement of operations for the fis-
cal year ended March 31, 2007 includes: (a) compen-
sation  cost  for  all  share-based  payments  granted 
prior to, but not yet vested as of April 1, 2006, based 
on the grant-date fair value estimated in accordance 
with the original provisions of SFAS No. 123 adjusted 
for estimated forfeitures and (b) compensation cost 
for  all  share-based  payments  granted,  modified  or 
settled  subsequent  to  April  1,  2006,  based  on  the 
grant-date  fair  value  estimated  in  accordance  with 
the provisions of SFAS No. 123R. In accordance with 
the  modified  prospective  transition  method,  results 
for prior periods have not been restated.

For the fiscal year ended March 31, 2007, the Com-
pany  recorded  stock-based  compensation  expense 
of approximately $837,000 for stock options granted 
under  the  Amended  and  Restated  2001  Repligen 
Corporation  Stock  Plan.  Basic  and  diluted  earnings 
per  share  amounts  for  the  fiscal  year  ended  March 
31, 2007 were decreased by $0.03 as a result of the 
adoption of SFAS No. 123R.

F.26

REPLIGEN CORPORATION

NOTES TO FINANCIAL STATEMENTS (continued)

The  Company  currently  has  the  following  stock-
based employee compensation plans which are sub-
ject  to  the  provisions  of  SFAS  No.  123R:  the  1992 
Repligen Corporation Stock Option Plan, as amended, 
and  the  Amended  and  Restated  2001  Repligen 
Corporation  Stock  Plan  (collectively,  the  “Plans”). 
The  1992  Repligen  Corporation  Stock  Option  Plan 
expired  on  September  14,  2001,  though  this  had  
no  impact  on  outstanding  option  grants.  Options 
granted  prior  to  the  date  of  termination  remain  out-
standing  and  may  be  exercised  in  accordance  with 
their terms.

The Plans allow for the granting of incentive and non-
qualified  options  and  restricted  stock  and  other 
equity awards to purchase shares of common stock. 
Historically,  incentive  options  granted  to  employees 
under the Plans generally vested over a four to five-

year period, with 20%–25% vesting on the first anni-
versary of the date of grant and the remainder vesting 
in  equal  yearly  installments  thereafter.  Nonqualified 
options  issued  to  non-employee  directors  and  con-
sultants under the Plans generally vest over one year. 
Options  granted  under  the  Plans  have  a  maximum 
term of ten years from the date of grant and gener-
ally,  the  exercise  price  of  the  stock  options  equals 
the  fair  market  value  of  the  Company’s  common 
stock  on  the  date  of  grant.  At  March  31,  2007, 
options to purchase 1,424,250 shares were outstand-
ing under the Amended and Restated 2001 Repligen 
Corporation  Plan  and  868,500  were  outstanding 
under  the  1992  Repligen  Corporation  Stock  Option 
Plan. At March 31, 2007, 420,109 shares were avail-
able  for  future  grant  under  the  Amended  and 
Restated 2001 Repligen Corporation Stock Plan.

The  Company  uses  the  Black-Scholes  option  pricing  model  to  calculate  the  fair  value  on  the  grant  date  of 
stock-based compensation for stock options granted under the Plans. The fair value of stock options granted 
during the fiscal years ended March 31, 2007 and March 31, 2006 were calculated using the following esti-
mated weighted average assumptions:

Year ended March 31,

2007

2006

2005

Expected term (years)
Volatility
Risk-free interest rate
Expected dividend yield

6.5

7
77.24%–91.86% 90.79%–94.41% 94.17%–95.38%
  4.44%–  5.07%   3.83%–  4.58%   3.76%–  4.29%
—

—

—

7

F.27

Expected  Term:  The  expected  term  of  options 
granted represents the period of time for which the 
options are expected to be outstanding and is derived 
from the Company’s historical stock option exercise 
experience  and  option  expiration  data.  For  option 
grants  made  subsequent  to  the  adoption  of  SFAS 
No. 123R, the expected life of stock options granted 
is  based  on  the  simplified  method  allowable  under 
SAB No. 107. Accordingly, the expected term is pre-
sumed to be the midpoint between the vesting date 
and the end of the contractual term. In addition, for 
purposes  of  estimating  the  expected  term,  the 
Company has aggregated all individual option awards 
into one group as the Company does not expect sub-
stantial  differences  in  exercise  behavior  among  its 
employees.

stock over a period commensurate with the option’s  
expected term. The Company does not believe that 
the  future  volatility  of  its  common  stock  over  an 
option’s expected term is likely to differ significantly 
from the past.

Risk-Free  Interest  Rate:  The  risk-free  interest  rate  
is  the  implied  yield  available  on  U.S.  Treasury  zero-
coupon  issues  with  a  remaining  term  equal  to  the 
option’s expected term on the grant date.

Expected Dividend Yield: The Company has never 
declared  or  paid  any  cash  dividends  on  any  of  its 
capital  stock  and  does  not  expect  to  do  so  in  the 
foreseeable  future.  Accordingly,  the  Company  uses 
an  expected  dividend  yield  of  zero  to  calculate  the 
grant-date fair value of a stock option.

Expected  Volatility:  The  expected  volatility  is  a 
measure  of  the  amount  by  which  the  Company’s 
stock  price  is  expected  to  fluctuate  during  the 
expected  term  of  options  granted.  The  Company 
determines the expected volatility solely based upon 
the  historical  volatility  of  the  Company’s  common  

The Company recognizes compensation expense on 
a straight-line basis over the requisite service period 
based  upon  options  that  are  ultimately  expected  to 
vest,  and  accordingly,  such  compensation  expense 
has  been  adjusted  by  an  amount  of  estimated  for-
feitures.  Forfeitures  represent  only  the  unvested  

2007 ANNUAL REPORT

NOTES TO FINANCIAL STATEMENTS (continued)

portion  of  a  surrendered  option.  SFAS  No.  123R 
requires  forfeitures  to  be  estimated  at  the  time  
of  grant  and  revised,  if  necessary,  in  subsequent 
periods  if  actual  forfeitures  differ  from  those  esti-
mates.  Prior  to  the  adoption  of  SFAS  No.  123R,  
the  Company  accounted  for  forfeitures  upon  occur-
rence  as  permitted  under  SFAS  No.  123.  Based  on 
an analysis of historical data, the Company has calcu-
lated  an  8%  annual  forfeiture  rate  for  non-director-
level  employees,  a  3%  annual  forfeiture  rate  for 

director-level employees, and a 0% forfeiture rate for  
non-employee  members  of  the  Board  of  Directors, 
which it believes is a reasonable assumption to esti-
mate  forfeitures.  However,  the  estimation  of  forfei-
tures requires significant judgment, and to the extent 
actual  results  or  updated  estimates  differ  from  the 
Company’s current estimates, such amounts will be 
recorded  as  a  cumulative  adjustment  in  the  period 
estimates are revised.

Information regarding option activity for the year ended March 31, 2007 under the Plans is summarized below:

Options  
Outstanding
(In thousands)

Weighted Average  
Exercise Price  
Per Share

Weighted Average 
Remaining  
Contractual Term 
(In years)

Aggregate  
Intrinsic Value
(In thousands)

Options outstanding at March 31, 2004

  Granted
  Exercised
  Forfeited/Cancelled

Options outstanding at March 31, 2005

  Granted
  Exercised
  Forfeited/Cancelled

Options outstanding at March 31, 2006

  Granted
  Exercised
  Forfeited/Cancelled

F.28

Options outstanding at March 31, 2007

Options exercisable at March 31, 2007

Vested and expected to vest at  
March 31, 2007(1)

2,051

340
(58)
(191)

2,142

629
(238)
(130)

2,403

210
(110)
(210)

2,293

1,564

2,235

$3.01

  2.56
  0.52
  3.07

  3.00

  3.04
  1.36
  3.13

  3.17

  2.98
  1.43
  3.03

$3.25

$3.28

$2.63

—

—
—
—

—

—
—
—

—

—
—
—

5.39

4.13

5.29

—

—
—
—

—

—
—
—

—

—
—
—

$1,485

$1,209

$1,468

(1)   This represents the number of vested options as of March 31, 2007 plus the number of unvested options expected to vest as of March 
31,  2007  based  on  the  unvested  outstanding  options  at  March  31,  2007  adjusted  for  the  estimated  forfeiture  rate  of  8%  for  awards 
granted to non-director level employees and 3% for awards granted to director level employees.

The aggregate intrinsic value in the table above rep-
resents  the  total  pre-tax  intrinsic  value  (the  differ-
ence between the closing price of the common stock 
on March 30, 2007 of $3.16 and the exercise price of 
each  in-the-money  option)  that  would  have  been 
received by the option holders had all option holders 
exercised their options on March 30, 2007.

The weighted average grant date fair value of options 
granted during the fiscal year ended March 31, 2007 
was  $2.31.  The  total  fair  value  of  stock  options  
that  vested  during  the  fiscal  year  ended  March  31, 
2007  and  2006  was  approximately  $869,000  and 
$871,000,  respectively.  The  total  intrinsic  value  of 
options exercised during the years ended March 31,  

2007,  2006 and 2005 was  $189,800, $852,152 and 
$95,563,  respectively,  determined  as  of  the  date  
of  exercise.  The  Company  received  $158,000, 
$340,111  and  $30,501  from  stock  option  exercises 
during  the  years  ended  March  31,  2007,  2006  and 
2005, respectively.

As of March 31, 2007, there was $1,275,000 of total 
unrecognized compensation cost related to unvested 
share-based awards. This cost is expected to be rec-
ognized over a weighted average remaining requisite 
service period of 2.86 years. The Company expects 
approximately  671,000  of  unvested  outstanding 
options to vest over the next five years.

REPLIGEN CORPORATION

NOTES TO FINANCIAL STATEMENTS (continued)

The range of exercise prices for options outstanding and exercisable as of March 31, 2007 are as follows:

Range of  
Exercise Prices

$0.00–$1.24
$1.25–$2.49
$2.50–$3.73
$3.74–$4.98
$4.99–$6.22
$6.23–$7.47
$7.48–$8.56

Outstanding as of  
March 31, 2007

Exercisable as of  
March 31, 2007

Weighted Average 
Remaining 
Contractual Life  
in Years

Weighted Average 
Exercise Price

Number  
of Shares

Weighted Average 
Exercise Price

2.99
3.72
6.64
8.54
5.98
3.47
4.69

5.39

$1.01
  1.64
  3.04
  4.19
  5.53
  7.19
  7.93

$3.25

17,000
687,900
480,200
39,700
119,999
5,000
214,000

1,563,799

$1.01
  1.59
  3.03
  4.23
  5.54
  7.19
  7.93

$3.28

Number  
of Shares

17,000
858,000
868,250
134,500
196,000
5,000
214,000

2,292,750

3. Income Taxes
The Company accounts for income taxes under SFAS 
No. 109, “Accounting for Income Taxes.” The Com-
pany  did  not  record  a  tax  provision  for  the  years 
ended  March  31,  2007,  2006  and  2005  as  the 
Company did not generate taxable income.

At March 31, 2007, the Company had net operating 
loss  carryforwards  for  income  tax  purposes  of 
approximately $100,130,000. The Company also had 
available  tax  credit  carryforwards  of  approximately 
$5,270,000 at March 31, 2007 to reduce future fed-
eral income taxes, if any. Federal and state net oper-
ating losses of approximately $9,004,000, $7,689,000 
and  $7,390,000  expired  in  fiscal  2007,  2006  and 
2005,  respectively.  The  net  operating  loss  and  tax 
credit carryforwards will continue to expire at various 
dates.  Net  operating  loss  carryforwards  and  avail-
able  tax  credits  are  subject  to  review  and  possible 

adjustment by the Internal Revenue Service and may 
be limited in the event of certain changes in the own-
ership interest of significant stockholders.

Deferred tax assets consist of the following:

Temporary differences
Operating loss  
carryforwards

Tax credit carryforwards

Valuation allowance

As of March 31,

2007

2006

$  6,580,000

$  7,420,000

40,060,000
5,270,000

42,520,000
5,590,000

51,910,000
(51,910,000)

55,530,000
(55,530,000)

$ 

— $ 

—

A  full  valuation  allowance  has  been  provided,  as  it  
is  uncertain  if  the  Company  will  realize  its  deferred 
tax assets.

A reconciliation of the federal statutory rate to the effective income tax rate from operations for fiscal years 
ended March 31, 2007, 2006 and 2005 is as follows:

Tax at U.S. statutory rate
State taxes, net of federal benefit
Permanent differences, net of  

federal benefit

Change in valuation allowance

Years ended March 31,

Years ended March 31,

2007

2006

2005

2007

2006

2005

$ (302,350)
—

$ (237,000)
—

$ (1,014,000)
—

34.00%
0.00%

34.00%
0.00%

34.00%
0.00%

152,887
(149,463)

(5,000)
(242,000)

6,000
1,008,000

(17.00)%
(0.20)%
0.08%
(17.00)% (34.08)% (33.80)%

Income tax expense

$ 

— $ 

— $ 

—

0.00%

0.00%

0.00%

4. Stockholders’ Equity

Common Stock and Warrants
At  March  31,  2007,  the  Company  has  reserved 
2,712,859 shares of common stock for incentive and 
nonqualified stock option plans.

Shareholder Rights Plan
In March 2003, the Company adopted a Shareholder 
Rights Agreement (the “Rights Agreement”). Under 
the  Rights  Agreement,  the  Company  distributed  
certain  rights  to  acquire  shares  of  the  Company’s  

2007 ANNUAL REPORT

F.29

F.30

NOTES TO FINANCIAL STATEMENTS (continued)

Series  A  junior  participating  preferred  stock  (the 
“Rights”)  as  a  dividend  for  each  share  of  common 
stock  held  of  record  as  of  March  17,  2003.  Each 
share  of  common  stock  issued  after  the  March  17, 
2003 record date has an attached Right. Under cer-
tain conditions involving an acquisition by any person 
or group of 15% or more of the common stock, each 
Right permits the holder (other than the 15% holder) 
to  purchase  common  stock  having  a  value  equal  to 
twice the exercise price of the Right, upon payment 
of the exercise price of the Right. In addition, in the 
event  of  certain  business  combinations  after  an 
acquisition by a person or group of 15% or more of 
the  common  stock  (20%  in  the  case  of  a  certain 
stockholder),  each  Right  entitles  the  holder  (other 
than  the  15%  holder)  to  receive,  upon  payment  of 
the  exercise  price,  common  stock  having  a  value 
equal  to  twice  the  exercise  price  of  the  Right.  The 
Rights have no voting privileges and, unless and until 
they become exercisable, are attached to, and auto-
matically trade with, the Company’s common stock. 
The Rights will terminate upon the earlier of the date 
of their redemption or March 2013.

5. Commitments and Contingencies

Lease Commitments
In 2001, the Company entered into a ten-year lease 
agreement for its corporate headquarters in Waltham, 
Massachusetts. In connection with this lease agree-
ment,  the  Company  issued  a  letter  of  credit  in  the 
amount  of  $200,000  to  its  landlord.  The  letter  of 
credit is collateralized by a certificate of deposit held 
by the bank that issued the letter of credit. The cer-
tificate  of  deposit  is  classified  as  restricted  cash  in 
the  accompanying  balance  sheet  as  of  March  31, 
2007 and 2006. The Company signed a lease in April 
2007  for  2,500  square  feet  of  space  in  Waltham, 
Massachusetts for off-site storage of materials. The 
lease expires in March 2012.

In  fiscal  2006,  the  Company  entered  into  a  capital 
lease agreement to provide the Company with man-
ufacturing  equipment.  Repligen  received  approx-
imately  $171,000  in  equipment  financing  over  a 
five-year period. In fiscal 2005, the Company entered 
into  two  capital  lease  agreements  to  provide  the 
Company  with  two  pieces  of  office  equipment. 
Repligen  received  approximately  $33,000  in  equip-
ment  financing.  The  lease  terms  are  three  and  five 
years beginning in June and October of 2004, respec-
tively.  Capital  lease  obligations  are  recorded  in 
accrued  liabilities  and  long-term  liabilities  in  the 
Company’s balance sheets.

Obligations  under  non-cancelable  operating  leases 
and  capital  equipment  leases,  including  the  facility 
lease  discussed  above,  as  of  March  31,  2007  are 
approximately as follows:

Years ending March 31,

2008
2009
2010
2011
Thereafter

Operating  
Lease

Capital  
Lease

$  449,000
455,000
473,000
473,000
361,000

$  48,870
48,870
45,209
—
—

Minimum lease payments

$ 2,211,000

$ 142,949

Less amount representing 

interest

Present value of future  

lease payment

Less current portion
Noncurrent obligation under 

capital leases

(17,648)

125,301

(48,870)

$  76,431

Rent expense charged to operations under operating 
leases was approximately $389,000 for each of the 
years ended March 31, 2007, 2006 and 2005. As of 
March 31, 2007 and 2006, the Company had deferred 
rent liability of $119,000 and $120,000, respectively, 
related to the Waltham facility.

Licensing and Research Agreements
The Company licenses certain technologies that are, 
or  may  be,  incorporated  into  its  technology  under 
several agreements and also has entered into several 
clinical  research  agreements  which  require  the 
Company to fund certain research projects. Generally, 
the license agreements require the Company to pay 
annual  maintenance  fees  and  royalties  on  product 
sales once a product has been established using the 
technologies.  The  Company  has  recorded  research 
and  development  expense  associated  with  license 
agreements of $87,000, $114,000 and $55,000, for 
the  years  ended  March  31,  2007,  2006  and  2005, 
respectively.

Supply Agreements
The Company has entered into an agreement with a 
manufacturer for certain components of its Protein A 
product. The Company has remaining purchase obli-
gations  of  approximately  $298,000  associated  with 
this agreement for the year ended March 31, 2008. 
The  Company  relies  on  a  sole  manufacturer  for  its 
SecreFlo® product. This reliance exposes it to a num-
ber of risks, including reduced control over manufac-
turing capacity, delivery times, inadequate inventory 
levels  which  could  lead  to  product  shortage  or 
charges for excess or obsolete inventory.

REPLIGEN CORPORATION

NOTES TO FINANCIAL STATEMENTS (continued)

6. Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist of 
the following:

Prepaid insurance
Equipment and services
Interest receivable
Clinical and research expenses
Other

As of March 31,

2007

2006

$ 124,376
71,656
167,483
47,636
34,264

$ 115,591
221,565
188,751
32,829
16,302

$ 445,415

$ 575,038

7. Accrued Liabilities
The  Company  prepares  its  financial  statements  in 
accordance  with  accounting  principles  generally 
accepted  in  the  United  States.  These  principles 
require that the Company estimate accrued liabilities. 
This  process  involves  identifying  services,  which 
have been performed on the Company’s behalf, and 
estimating  the  level  of  service  performed  and  the 
associated cost incurred for such service as of each 
balance sheet date. Examples of estimated accrued 
expenses include: 1) Fees paid to contract manufac-
turers  in  conjunction  with  the  production  of  clinical 
materials. These expenses are normally determined 
through  a  contract  or  purchase  order  issued  by  the 
Company;  2)  Service  fees  paid  to  organizations  for 
their performance in conducting clinical trials. These 
expenses  are  determined  by  contracts  in  place  for 
those  services  and  communications  with  project 
managers  on  costs  which  have  been  incurred  as  of 
each  reporting  date;  3)  Professional  and  consulting 
fees  incurred  with  law  firms,  audit  and  accounting 
service  providers  and  other  third-party  consultants. 
These expenses are determined by either requesting 
those service providers to estimate unbilled services 
at each reporting date for services incurred, or track-
ing  costs  incurred  by  service  providers  under  fixed-
fee  arrangements.  The  Company  has  processes  in 
place to estimate the appropriate amounts to record 
for  accrued  liabilities,  which  principally  involve  the 
applicable  personnel  reviewing  the  services  pro-
vided. In the event that the Company does not iden-
tify certain costs which have begun to be incurred or 
the  Company  under-  or  over-estimates  the  level  of 
services  performed  or  the  costs  of  such  services, 
the  reported  expenses  for  that  period  may  be  too 
low or too high. The date on which certain services 
commence,  the  level  of  services  performed  on  or 
before  a  given  date,  and  the  cost  of  such  services 
are  often  judgmental.  The  Company  makes  these 
judgments based upon the facts and circumstances 
known at the date of the financial statements.

A change in the estimated cost or volume of services 
provided could result in additional accrued liabilities. 
Any  significant  unanticipated  changes  in  such  esti-
mates could have a significant impact on our accrued 
liabilities  and  reported  operating  results.  There  has 
been  no  material  adjustments  to  our  accrued  liabili-
ties in any of the periods presented in the accompa-
nying financial statements.

Accrued liabilities consist of the following:

Royalty expenses
Payroll & payroll-related costs
Research & development 

As of March 31,

2007

2006

$ 

56,529
557,100

$ 

—
474,923

costs

602,615

436,016

Professional and consulting 

costs

Other accrued expenses
Unearned revenue
Other current liabilities

400,474
122,836
127,170
309,015

320,694
62,767
38,599
536,350

$ 2,175,739

$ 1,869,349

In  February  2004,  the  Company  terminated  its 
Licensing  Agreement  with  ChiRhoClin.  On  May  9, 
2005, Repligen entered into a Settlement Agreement 
with ChiRhoClin, Inc., in full settlement of their arbi-
tration proceedings described below. Repligen deter-
mined that it was not required to pay approximately 
$1,170,000  of  unremitted  and  accrued  royalties  to 
ChiRhoClin.  This  was  recorded  as  other  income  in 
the  quarter  ended  June  30,  2005.  Under  the  terms 
of the Agreement, Repligen also received a payment 
of $750,000 and will be entitled to continue to mar-
ket SecreFlo® for the next few years under a royalty 
structure more favorable to Repligen than under the 
Licensing  Agreement.  ChiRhoClin  is  obligated  to 
deliver  a  certain  amount  of  SecreFlo®  to  Repligen 
over the next few years. This payment of $750,000 
was recorded as “Accrued Liabilities” at the time of 
settlement. The adoption of EITF 02-16, Accounting 
by  a  Customer  (Including  a  Reseller)  for  Certain 
Consideration Received from a Vendor (“EITF 02-16”) 
has resulted in the Company reducing cost of goods 
sold  as  future  inventory  purchased  from  ChiRhoClin 
is sold. Other current liabilities as of March 31, 2007 
includes $269,052 related to ChiRhoClin settlement 
which will be relieved as a reduction to cost of good 
sold  as  future  inventory  purchased  from  ChiRhoClin 
is sold.

8. Employee Benefit Plan
The  Repligen  Corporation  401(k)  Savings  and 
Retirement  Plan  (the  “401(k)  Plan”)  is  a  qualified 
defined contribution plan in accordance with Section  

2007 ANNUAL REPORT

F.31

F.32

NOTES TO FINANCIAL STATEMENTS (continued)

401(k) of the Internal Revenue Code. All employees 
over the age of 21 who have completed four months 
of  service  are  eligible  to  make  pre-tax  contributions 
up to a specified percentage of their compensation. 
Under the 401(k) Plan, the Company may, but is not 
obligated to match a portion of the employees’ con-
tributions  up  to  a  defined  maximum.  The  match  is 
calculated  on  a  calendar  year  basis.  The  Company 
matched  $ 31,353,  $27,278  and  $ 34,245  for  the  
fiscal years ended March 31, 2007, 2006 and 2005, 
respectively. Forfeitures of previous participants par-
tially  funded  contributions  for  fiscal  year  2007.  For-
feitures  of  previous  participants  completely  funded 
contributions for fiscal years 2006 and 2005 and as a 
result had no impact on the Company’s operations.

9. Related Party Transaction
Repligen  paid  Drs.  Schimmel  and  Rich,  the  Co-
Chairmen  of  the  Board  of  Directors,  $49,200  and 
$43,200, respectively, during each of the fiscal years 
ended  March  31,  2007,  2006  and  2005  pursuant  to 
consulting  agreements,  which  have  similar  terms. 
These  agreements  are  automatically  extended  for 
successive  one-year  terms  unless  terminated  by 
either party to the agreement at least 90 days prior 
to the next anniversary date. Dr. Schimmel’s agree-
ment  continues  until  September  30,  2007  and  Dr. 
Rich’s  agreement  continues  until  October  31,  2007. 
Dr.  Schimmel  will  retire  from  the  Board  as  of  the 
next  annual  meeting  in  September  2007.  Dr.  Rich 
has  advised  Repligen  that  he  has  no  present  inten-
tion  of  terminating  his  agreement.  Drs.  Schimmel 
and Rich receive no separate cash compensation for 
attendance at meetings or otherwise as directors.

10. Legal Proceedings

ImClone Systems
In  July  2006,  Repligen  reported  that  the  United 
States  District  Court  for  the  District  of  Massachu-
setts  issued  a  Summary  Judgment  ruling  in  favor  
of  Repligen  and  the  Massachusetts  Institute  of 
Technology  (“MIT”)  and  rejected  ImClone  Systems 
Incorporated’s (“ImClone”) defense of patent exhaus-
tion in the ongoing patent infringement lawsuit over 
the  production  of  Erbitux ®.  In  their  complaint, 
Repligen  and  MIT  allege  that  ImClone’s  production 
of  Erbitux®  infringes  U.S.  patent  4,663,281  which 
covers  certain  genetic  elements  that  increase  pro-
tein  production  in  a  mammalian  cell.  This  patent  is 
assigned to MIT and exclusively licensed to Repligen.

ImClone  had  previously  reported  that  it  produced 
approximately  $1  billion  worth  of  Erbitux®  prior  to  
the  expiration  of  the  patent-in-suit  in  2004  and  that 
Bristol-Myers Squibb, ImClone’s commercial partner, 
has paid ImClone $900 million in up-front and mile-
stone payments as well as a 39% royalty on the net 
sales of Erbitux® in the United States.

Repligen  and  MIT  allege  that  the  cell  line  that 
ImClone uses to produce Erbitux® employs key tech-
nology that is claimed in the patent-in-suit. Repligen 
and  MIT  also  allege  that  the  cell  line  was  created 
under  contract  for  the  National  Cancer  Institute 
(“NCI”)  by  a  predecessor  to  Repligen  and  subse-
quently transferred from the NCI to ImClone for use 
in  research  and  development  only.  In  its  ruling,  the 
Court  found  that  neither  the  transfer  to  the  NCI  by 
Repligen’s predecessor nor the subsequent transfer 
to  ImClone  by  the  NCI  exhausted  the  proprietary 
rights  of  Repligen  and  MIT.  The  Court’s  ruling  has 
eliminated  these  arguments  as  a  potential  defense 
for ImClone at trial. Repligen and MIT intend to seek 
damages adequate to compensate Repligen and MIT 
for  ImClone’s  unlicensed  use  of  the  patented  tech-
nology  and  a  multiplier  of  any  such  damage  award 
based on ImClone’s willful infringement.

Bristol-Myers Squibb Company (“Bristol”)
In  January  2006,  Repligen  Corporation  and  the 
University  of  Michigan  jointly  filed  a  complaint 
against  Bristol  in  the  United  States  District  Court  
for  the  Eastern  District  of  Texas  for  infringement  of 
U.S.  Patent  No.  6,685,941  (“the  ‘941  patent”)  for 
the  commercial  sale  of  Orencia®.  The  ‘941  patent, 
entitled “Methods of Treating Autoimmune Disease 
via  CTLA4-Ig,”  covers  methods  of  using  CTLA4-Ig 
to  treat  rheumatoid  arthritis,  as  well  as  other  thera-
peutic  methods.  Repligen  has  exclusive  rights  to  
this  patent  from  its  owners,  the  University  of 
Michigan  and  the  U.S.  Navy.  In  February  2006, 
Bristol  answered  the  complaint  and  counterclaimed 
seeking a declaratory judgment that the ‘941 patent 
is  invalid  and  unenforceable  and  that  Bristol  does  
not infringe the patent. On November 16, 2006, the 
Court  held  a  scheduling  conference.  Jury  selection 
for the trial in this matter is scheduled to commence 
on April 7, 2008. The outcome of this case is unde-
terminable at this time.

From time to time, we may be subject to legal pro-
ceedings  and  claims,  in  the  ordinary  course  of  
business.  We  are  not  currently  aware  of  any  such 
proceedings  or  claims  that  we  believe  will  have,  
individually  or  in  the  aggregate,  a  material  adverse 
effect on the business, financial condition or results 
of operations.

11. Subsequent Event
On  April 6, 2007, Repligen Corporation entered  into 
an  exclusive  worldwide  commercial  license  agree-
ment with The Scripps Research Institute (“Scripps”). 
Pursuant to the Agreement, the Company obtained a 
license to use, commercialize and sublicense certain 
patented  technology  and  improvements  thereon, 
owned or licensed by Scripps, relating to compounds 
which may have utility in treating Friedreich’s ataxia, 
an inherited neurodegenerative disease. Research in 

REPLIGEN CORPORATION

NOTES TO FINANCIAL STATEMENTS (continued)

tissues  derived  from  patients,  as  well  as,  in  mice, 
indicates  that  the  licensed  compounds  increase  
production  of  the  protein  frataxin,  which  suggests 
potential  utility  of  these  compounds  in  slowing  or 
stopping  progression  of  the  disease.  There  is  cur-
rently no treatment for Friedreich’s ataxia.

Pursuant to the Agreement, the Company agreed to 
pay Scripps an initial license fee of $300,000, certain 
royalty  and  sublicense  fees  and,  in  the  event  the 
Company  achieves  specified  developmental  and 
commercial milestones, certain additional milestone 
payments.  In  addition,  the  Company  issued  Scripps 
87,464  shares  of  the  Company’s  common  stock  
(the  “Shares”)  representing  $ 300,000  as  of  the 
Effective  Date.  If  the  value  of  the  Shares  does  not 
equal at least $300,000 on the one-year anniversary 
of  the  Effective  Date,  the  Company  shall  make  a 
cash  payment  to  Scripps  equal  to  the  difference 
between the actual total value of the Shares on the 
one-year  anniversary  of  the  Effective  Date  and  the 

Effective  Date.  The  Company  issued  the  Shares  in 
reliance on the exemption from registration provided 
by  Section  4(2)  of  the  Securities  Act  of  1933,  as 
amended.  The  Shares  were  issued  exclusively  to 
Scripps  as  an  “accredited  investor”  (as  such  term  
is  defined  in  Rule  501(a)  of  Regulation  D)  without  
general solicitation or advertising and did not involve 
a public offering.

The  Agreement  expires  or  may  be  terminated  
(i)  when  all  of  the  royalty  obligations  under  the 
Agreement expire; (ii) at any time by mutual written 
consent;  (iii)  by  Scripps  if  the  Company  (a)  fails  to 
make  payments  under  the  Agreement,  (b)  fails  to 
achieve  certain  developmental  and  commercial 
objectives, (c) becomes insolvent, (d) is convicted of 
a felony relating the manufacture, use or sale of the 
licensed technology or (e) defaults in its performance 
under the Agreement; or  (iv) by  the  Company upon 
90 days written notice.

12.  Selected Quarterly Financial Data (Unaudited)
The following table contains Statements of Operations information for each quarter of fiscal 2007 and 2006. 
The Company believes that the following information reflects all normal recurring adjustments necessary for a 
fair  presentation  of  the  information  for  the  periods  presented.  The  operating  results  for  any  quarter  are  not 
necessarily indicative of results for any future period.

Revenue:
  Product revenue
  Research revenue

Total revenue
Operating expenses:
  Cost of revenue
  Research and development
  Selling, general and administrative

Total operating expenses
Income (loss) from operations
Investment income
Interest expense
Other income

Net income (loss)

Earning per share:
  Basic

  Diluted

Q4 
FY07

Q3 
FY07

Q2 
FY07

Q1 
FY07

Q4 
FY06

Q3 
FY06

Q2 
FY06

Q1 
FY06

(In thousands, except per share amounts)

$ 3,397
302

$ 3,633
249

$ 2,680
185

$ 3,364
264

$ 2,842
42

$ 2,958
30

$ 2,716
84

$ 4,013
226

3,699

3,882

2,865

3,628

2,884

2,988

2,800

4,239

902
1,452
1,696

4,050
(351)
247
(3)
—

805
1,674
1,660

4,139
(257)
240
(3)
—

915
1,583
1,463

3,961
(1,096)
236
(3)
—

993
1,215
1,541

3,749
(121)
225
(3)
—

889
1,412
1,597

3,898
(1,014)
198
(3)
—

817
1,236
1,341

3,394
(406)
204
—
—

872
1,325
1,283

3,480
(680)
212
—
—

973
1,190
1,196

3,359
880
136
—
1,170

$  (107)

$ 

(20)

$  (863)

$  101

$  (819)

$  (202)

$  (468)

$ 2,186

$ (0.00)

$ (0.00)

$ (0.03)

$ (0.00)

$ (0.03)

$ (0.01)

$ (0.02)

$  0.07

$ (0.00)

$ (0.00)

$ (0.03)

$ (0.00)

$ (0.03)

$ (0.01)

$ (0.02)

$  0.07

Weighted average shares outstanding:
  Basic

30,420

30,376

30,364

30,358

30,202

30,105

30,098

30,094

  Diluted

30,420

30,376

30,364

30,828

30,202

30,105

30,098

30,399

13. Valuation and Qualifying Accounts

Allowance for Doubtful Accounts:
2005
2006
2007

Balance at  
Beginning  
of Period

$35,000
$15,000
$10,000

Reversal  
Without  
Utilization

Balance at  
End of 
Period

Additions

—
—
—

$15,000
$20,000
$  5,000
$10,000
$        — $10,000

2007 ANNUAL REPORT

F.33

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of 
Repligen Corporation

We  have  audited  the  accompanying  balance  sheets 
of  Repligen  Corporation  as  of  March  31,  2007  and 
2006,  and  the  related  statements  of  operations, 
stockholders’ equity, and cash flows for each of the 
three  years  in  the  period  ended  March  31,  2007. 
These  financial  statements  are  the  responsibility  of 
the Company’s management. Our responsibility is to 
express  an  opinion  on  these  financial  statements 
based on our audits.

We  conducted  our  audits  in  accordance  with  the 
standards  of  the  Public  Company  Accounting  Over-
sight Board (United States). Those standards require 
that we plan and perform the audit to obtain reason-
able  assurance  about  whether  the  financial  state-
ments  are  free  of  material  misstatement.  An  audit 
includes examining, on a test basis, evidence support-
ing  the  amounts  and  disclosures  in  the  financial  
statements.  An  audit  also  includes  assessing  the 
accounting  principles  used  and  significant  estimates 
made by management, as well as evaluating the over-
all financial statement presentation. We believe that 
our audits provide a reasonable basis for our opinion.

March 31, 2007 and 2006, and the results of its oper-
ations, and its cash flows for each of the three years 
in  the  period  ended  March  31,  2007,  in  conformity 
with U.S. generally accepted accounting principles.

As discussed in Note 2 to the consolidated financial 
statements, on April 1, 2006, the Company adopted 
the  provisions  of  Statement  of  Financial  Accounting 
Standards No. 123R, Share-Based Payment.

We have also audited, in accordance with the stand-
ards  of  the  Public  Company  Accounting  Oversight 
Board (United States), the effectiveness of Repligen 
Corporation’s internal control over financial reporting 
as  of  March  31,  2007,  based  on  criteria  established 
in Internal Control—Integrated Framework issued by 
the  Committee  of  Sponsoring  Organizations  of  the 
Treadway Commission and our report dated June 6, 
2007 expressed an unqualified opinion thereon.

ERNST & YOUNG LLP

In  our  opinion,  the  financial  statements  referred  
to  above  present  fairly,  in  all  material  respects,  the 
financial  position  of  Repligen  Corporation  as  of  

Boston, Massachusetts
June 6, 2007

F.34

REPLIGEN CORPORATION

MANAGEMENT’S ANNUAL REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Management  of  the  Company  is  responsible  for 
establishing  and  maintaining  adequate  internal  con-
trol  over  financial  reporting.  Internal  control  over 
financial  reporting  is  defined  in  Rule  13a-15(f)  and 
15d-15(f)  under  the  Exchange  Act  as  a  process 
designed  by,  or  under  the  supervision  of,  the 
Company’s principal executive and principal financial 
officers  and  effected  by  the  Company’s  board  of 
directors,  management  and  other  personnel  to  pro-
vide reasonable assurance regarding the reliability of 
financial  reporting  and  the  preparation  of  financial 
statements for external purposes in accordance with 
U.S.  generally  accepted  accounting  principles  and 
includes those policies and procedures that:

•   pertain to the maintenance of records that in rea-
sonable  detail  accurately  and  fairly  reflect  the 
transactions  and  dispositions  of  the  assets  of  the 
company;

•   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 manage-
ment and directors of the company; and

•   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.

Because  of  its  inherent  limitations,  internal  control 
over financial reporting may not prevent or detect mis-
statements.  Projections  of  any  evaluation  of  effec-
tiveness  to  future  periods  are  subject  to  the  risks 
that  controls  may  become  inadequate  because  of 
changes in conditions, or that the degree of compli-
ance with the policies or procedures may deteriorate.

Management  assessed  the  effectiveness  of  the 
Company’s  internal  control  over  financial  reporting  
as  of  March  31,  2007.  In  making  this  assessment, 
management used the criteria established in Internal 
Control—Integrated Framework, issued by the Com-
mittee of Sponsoring Organizations of the Treadway 
Commission  (COSO).  Based  on  this  assessment, 
our  management  concluded  that,  as  of  March  31, 
2007,  our  internal  control  over  financial  reporting  is 
effective based on those criteria. Our management’s 
assessment of the effectiveness of our internal con-
trol over financial reporting as of March 31, 2007 has 
been audited by Ernst & Young LLP, an independent 
registered  public  accounting  firm,  as  stated  in  their 
report appearing in Item 9A of this Form 10-K.

REPLIGEN CORPORATION

June 6, 2007

F.35

2007 ANNUAL REPORT

ATTESTATION REPORT OF THE INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of 
Repligen Corporation

We  have  audited  management’s  assessment, 
included  in  the  accompanying  Report  of  Manage-
ment  on  Internal  Control  Over  Financial  Reporting, 
that the Company maintained effective internal con-
trol  over  financial  reporting  as  of  March  31,  2007, 
based  on  criteria  established  in  Internal  Control-
Integrated  Framework  issued  by  the  Committee  of 
Sponsoring Organizations of the Treadway Commis-
sion  (the  COSO  criteria).  Repligen  Corporation’s 
management is responsible for maintaining effective 
internal  control  over  financial  reporting  and  for  its 
assessment  of  the  effectiveness  of  internal  control 
over  financial  reporting.  Our  responsibility  is  to 
express  an  opinion  on  management’s  assessment 
and an opinion on the effectiveness of the Company’s 
internal  control  over  financial  reporting  based  on  
our audit.

We  conducted  our  audit  in  accordance  with  the 
standards  of  the  Public  Company  Accounting  Over-
sight Board (United States). Those standards require 
that we plan and perform the audit to obtain reason-
able assurance about whether effective internal con-
trol  over  financial  reporting  was  maintained  in  all 
material  respects.  Our  audit  included  obtaining  
an  understanding  of  internal  control  over  financial 
reporting, evaluation of management’s assessment, 
testing  and  evaluating  the  design  and  operating 
effectiveness of internal control and performing such 
other procedures, as we considered necessary in the 
circumstances. We believe that our audit provides a 
reasonable basis for our opinion.

A company’s internal control over financial reporting 
is  a  process  designed  to  provide  reasonable  assur-
ance  regarding  the  reliability  of  financial  reporting 
and the preparation of financial statements for exter-
nal purposes in accordance with generally accepted 
accounting  principles.  A  company’s  internal  control 
over  financial  reporting  includes  those  policies  and 
procedures  that  (1)  pertain  to  the  maintenance  of 
records  that,  in  reasonable  detail,  accurately  and 
fairly  reflect  the  transactions  and  dispositions  of  
the  assets  of  the  Company;  (2)  provide  reasonable 
assurance  that  transactions  are  recorded  as  neces-
sary  to  permit  preparation  of  financial  statements  

in  accordance  with  generally  accepted  accounting 
principles,  and  the  receipts  and  expenditures  of  the 
company  are  being  made  only  in  accordance  with 
authorizations  of  management  and  directors  of  the 
Company;  and  (3)  provide  reasonable  assurance 
regarding prevention or timely detection of unauthor-
ized acquisition, use, or disposition of the company’s 
assets that could have a material effect on the finan-
cial statements.

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  
risk  that  controls  may  become  inadequate  because 
of  changes  in  conditions,  or  that  the  degree  of  
compliance  with  the  policies  or  procedures  may 
deteriorate.

In  our  opinion,  management’s  assessment  that  the 
Company  maintained  effective  internal  control  over 
financial  reporting  as  of  March  31,  2007,  is  fairly 
stated, in all material respects, based on the COSO 
criteria.  Also,  in  our  opinion,  the  Company  main-
tained, in all material respects, effective internal con-
trol  over  financial  reporting  as  of  March  31,  2007, 
based on the COSO criteria.

We also have audited, in accordance with the stand-
ards  the  Public  Company  Accounting  Oversight 
Board (United States), the balance sheets of Repligen 
Corporation as of March 31, 2007 and 2006, and the 
related  statements  of  operations,  shareholders’ 
equity, and cash flows for each of the three years in 
the  period  ended  March  31,  2007  and  our  report 
dated  June  6,  2007,  expressed  an  unqualified  opin-
ion thereon.

ERNST & YOUNG LLP

Boston, Massachusetts
June 6, 2007

F.36

REPLIGEN CORPORATION

 
 
 
CORPORATE INFORMATION

BOARD OF DIRECTORS

TRANSFER AGENT AND REGISTRAR

ANNUAL MEETING

American Stock Transfer  
& Trust Company  
59 Maiden Lane  
Plaza Level  
New York, NY 10038

(877) 777-0800, select option 1  
www.amstock.com  
Investor Relations E-mail:  
(Shareholder Inquiries) 
info@amstock.com

The Transfer Agent is responsible  
for handling shareholder questions 
regarding lost certificates, address 
changes and changes of ownership 
or name in which shares are held.

GENERAL COUNSEL

Goodwin Procter LLP  
Exchange Place  
53 State Street  
Boston, MA 02109

INDEPENDENT ACCOUNTANTS

Ernst and Young, LLP  
200 Clarendon Street  
Boston, MA 02116

The Annual Meeting of  
Stockholders will be held on  
Friday, September 14, 2007  
at 10:00 AM at  
Repligen’s corporate offices,  
41 Seyon Street 
Building #1, Suite 100 
Waltham, MA 02453

MARKET FOR REPLIGEN  
CORPORATION STOCK

Nasdaq Global Market  
Common Stock: RGEN

INVESTOR INFORMATION

Copies of our annual reports on  
Form 10-K, proxy statements,  
quarterly reports on Form 10-Q,  
and current reports on Form 8-K  
are available to stockholders upon 
request without charge. Please visit 
our website at www.repligen.com  
or send requests to:

Repligen Corporation  
41 Seyon Street  
Building #1, Suite 100  
Waltham, MA 02453  
ATTN: Investor Relations

Phone: (781) 419-1823  
Fax: (781) 250-0115  
E-mail: investors@repligen.com

Karen A. Dawes
Principal  
Knowledgeable Decisions, LLC

Robert J. Hennessey
Former Chief Executive Officer  
Penwest Pharmaceuticals Co.

Walter C. Herlihy, Ph.D.
President and  
Chief Executive Officer  
Repligen Corporation

Alexander Rich, M.D., Co-Chairman
Sedgwick Professor of Biophysics  
Department of Biology  
Massachusetts Institute of Technology

Thomas F. Ryan, Jr.
Retired/Private Investor

Paul Schimmel, Ph.D., Co-Chairman
Ernest and Jean Hahn Professor of 
Molecular Biology & Chemistry  
The Skaggs Institute for  
Chemical Biology  
The Scripps Research Institute

CORPORATE OFFICERS

Walter C. Herlihy, Ph.D.
President and  
Chief Executive Officer

Daniel W. Muehl
Chief Financial Officer

James R. Rusche, Ph.D.
Sr. Vice President,  
Research and Development

Daniel P. Witt, Ph.D.
Vice President, Operations

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This annual report contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 27A  
of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The forward- 
looking statements in this annual report do not constitute guarantees of future performance. Investors are cautioned that state-
ments in this annual report that are not strictly historical statements, including, without limitation, statements regarding current or 
future financial performance, regulatory approvals, management’s strategy, plans and objectives for future operations and product 
candidate acquisition, clinical trials and results, litigation strategy, results of litigation, product research and development, product 
efficacy, R&D expenditures, intellectual property, development and manufacturing plans, availability of materials and product and 
adequacy of capital resources and financing plans constitute forward-looking statements. Such forward-looking statements are 
subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated, including, 
without limitation, the risks identified in our annual report on Form 10-K and our other filings with the Securities and Exchange 
Commission. We assume no obligation to update any forward-looking information contained in this annual report.

 
 
 
 
 
 
 
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Building #1, Suite 100  
Waltham, MA 02453  
(781) 250-0111  
info@repligen.com  
www.repligen.com