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Rexahn Pharmaceuticals, Inc.

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FY2012 Annual Report · Rexahn Pharmaceuticals, Inc.
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Pipeline Overview: 

Rexahn’s  portfolio  of  potential  drugs addresses  a 
spectrum  of  cancers  that  afflict  millions  of  people 
worldwide. These compounds are unique in that they 
target  cancer  specific  mechanisms  which  are  not 
present in healthy non-cancerous tissue.   
Today,  our  clinical  development  pipeline  consists  of 
three novel compounds: 

Archexin®

(Phase 

IIa)  a  best-in-class 

compound  that  blocks  both  the  activated  and  native  forms  of  Akt1  and  has 
FDA orphan drug designation for the treatment of pancreatic cancer, ovarian 
cancer, stomach cancer, RCC, and glioblastoma. 
RX-3117

  (Phase  I)  a  best-in-class  inhibitor  of  DNA  synthesis  under  co-
development  with  Teva  Pharmaceutical  that  exhibits  high  bioavailability  and 
may have a superior safety profile compared to gemcitabine, the current first-
line therapy for pancreatic and other cancers. 
RX-5902

  (Phase  I)  a 

inhibits  the 
phosphorylated  p68  RNA  helicase,  a  protein  that  plays  a  key  role  in  cancer 
growth, progression and metastasis. 

first-in-class  small  molecule  that 

®

The  most  clinically-advanced  compound  in  our  oncology  portfolio  is  Archexin
,  a 
novel  best-in-class  Akt1  inhibitor  with  FDA  orphan  designation  in  the  treatment  of 
cancers  in  various  solid  tumors,  including  pancreatic  and  ovarian  cancer.  Archexin 
specifically blocks the production of Akt1, a molecule that plays a central role in the 
uncontrolled growth of tumor mass. By inhibiting active and native Akt1 production 
Archexin promises to deliver better efficacy and safety. Because the activated form of 
Akt1  is  present  only  in  cancer  cells,  the  overall  safety  profile  of  Archexin  may  be 
superior  to  existing  cytotoxic  compounds  which  affect  growth  in  both  cancer  and 
non-cancer  cells.  Rexahn  will  be  conducting  two  additional  Phase  IIa  clinical  trials 
beginning  in  the  second  half  of  2013. The  first  clinical  trial  will  be  conducted  in 
patients  with  solid  tumors  that  have  become  resistant  to  existing  cytotoxic 
compounds  and  the  second  clinical  trial  will  be  conducted  in  patients  with  a 
hematological malignancy. 

Another  exciting  compound  is  RX-3117,  a  best-in-class  cytotoxic  antimetabolite 
nucleoside  compound,  which  is  being  co-developed  with  Teva  Pharmaceutical 
Industries. In vitro and in vivo studies have demonstrated RX-3117 to have: 

 
 

Potent in vitro inhibition of proliferation of many solid tumor types. 
Potent in vitro anti-proliferation effects on gemcitabine drug-resistant cancer 
cells. 

 
 
  
 
  
  
  
 
 

Significant  in  vivo  anti-tumor  activity  in  mouse  colon  xenograft  models, 
including colon and lung cancer cells. 

RX-3117 has completed an exploratory clinical trial in patients for oral bioavailability, 
safety and PK. IND filing and a Phase I clinical trial is scheduled in the second half of 
2013. 

Another  very  promising  compound  is  RX-5902,  a  first-in-class  inhibitor  of  p68  RNA 
helicase.  Phosphorylated-p68  RNA  helicase  plays  a  critical  role  in  transcription  and 
translation  and  helicase  activity.  Over-expression  of  phosphorylated-p68  has  been 
observed  in  solid  tumors,  such  as  colon,  breast,  head  and  neck  squamous  cell 
carcinomas,  prostate  and  ovarian  cancers  and  multiple  myeloma.  However, 
phosphorylated-p68 
tissue. 
Phosphorylated-p68  RNA  helicase  plays  an  important  role  in  tumor  progressions, 
metastasis and prognosis. 

is  not  present 

(non-cancerous) 

in  healthy 

Rexahn  is  developing  RX-5902  to  be  an  orally  administered  first-in-class  p68  RNA 
helicase inhibitor with great potential to be effective against solid tumors. 

Rexahn has filed the IND for RX-5902 and will be initiating a Phase I clinical trial in 
the second quarter of 2013. 
Rexahn’s extended portfolio of pre-clinical oncology drug candidates includes: 

RX-0201-Nano: Nanoliposomal anticancer Akt1 inhibitor 

RX-0201, the active ingredient of Archexin®, is a best-in-class, potent inhibitor of the 
Akt1 protein kinase. RX-0201-Nano is a nanoliposomal product of RX-0201 with high 
incorporation efficiency  and  good stability. Nanoliposomal delivery  of RX-0201  may 
provide  significant  clinical  benefits  including  targeted  higher  cellular  uptake, 
extended circulation time, reduced drug-related toxicity, and improved efficacy. 
RX-0047-Nano: Nanoliposomal anticancer HIF-1α inhibitor 

RX-0047 is a potent inhibitor of HIF-1α, a key transcription factor involved in cancer 
cell survival, metastasis, and angiogenesis. Studies in xenografted models have shown 
RX-0047  to  inhibit  tumor  growth  in  lung  and  prostate  and  blocks  metastasis.  RX-
0047-Nano is a nanoliposomal product of RX-0047 with high incorporation and good 
stability. 
RX-21101: Nano-polymer Anticancer Drug 

RX-21101(HPMA-docetaxel) is an anticancer drug that can overcome the downside of 
cytotoxic compounds, such as poor solubility, stability, and severe adverse reactions. 
Conjugating  water-soluble  and  non-toxic  HPMA 
to  conventional  anticancer 
compounds bolsters efficacy while lowering toxicity. 

 
 
 
 
 
 
 
Chairman Letter:  

Dear fellow stockholder: 

In  2012  we  fully  transitioned  Rexahn  into  a  cancer 
focused  biopharmaceutical  company,  a  therapeutic  area 
where  we  have  strong  expertise  and  a  promising 
pipeline.  We  believe  that  by  directing  our  resources  to 
the  company’s  differentiated  pre-clinical  and  clinical-
stage oncology assets, we can drive significant long-term 
value for shareholders. 

To successfully lead Rexahn on its new path, we recruited 
Dr.  Peter  Suzdak  to  be  the  company’s  Chief  Executive 
Officer.  Peter  is  a  first-rate  clinical  development  expert  who  will  help  us  to  fully 
unlock the value of our oncology pipeline. 

I am pleased to report that we are accomplishing our oncology development goals. 

This  past  August,  we  reported  positive  top-line  phase  IIa  clinical  study  results  for 
Archexin in patients with advanced pancreatic cancer. Archexin is being developed 
as  a  potential  best-in-class  inhibitor  of  the  Akt1  protein  kinase  in  cancer  cells. 
Rexahn  conducted  an  open  label  study  to  determine  the  safety  and  efficacy  of 
Archexin  in  combination  with  gemcitabine.  This  study  demonstrated  that  the 
combination  treatment  provided  a  median  survival  of  9.1  months  compared  to 
historical data for standard single agent gemcitabine therapy of 5.7 months.  

We  also  concluded  the  first-in-human  clinical  study  of  RX-3117  with  our  co-
development  partner,  Teva  Pharmaceutical  Industries,  Ltd.  The  study  successfully 
met its primary objective of determining the drug’s oral bioavailability in humans. It 
also enhanced RX-3117 position as a potential future alternative to market leading 
anti-metabolite  therapies  in  treatment  of  solid  tumors  in  the  colon,  lung,  bladder 
and pancreas. 

We are excited about RX-5902, our first-in-class p68 RNA Helicase Inhibitor. Rexahn 
submitted  an  IND  application  to  the  FDA  for  RX-5902  to  begin  testing  this  drug’s 
potent  anti-tumor  activity  in  cancer  patients.  RX-5902  is  unique  because  it  is  a 
broad  anti-cancer  agent  that  specifically  targets  the  p68  protein  that  is  over-
expressed in cancer cells. Our pre-clinical studies have shown that RX-5902 is also 
effective  in  drug-resistant  cancer  cells  and  can  be  applied  as  a  cocktail  with  other 
current cancer drugs.  

Rexahn  also  improved  its  financial  position  in  2012.  The  Company  raised  $7.3 
million  in  a  public  offering  and  saw  Teva  Pharmaceutical  Industries  increase  its 
ownership in the Company to 6.3 percent. 

 
 
 
 
 
 
 
 
 
Rexahn  has  worked  hard  to  align  its  operations,  strategy  and  goals  over  the 
past year. The decisions made, and steps taken, have positioned the Company 
to develop cancer therapeutics with best-in-class or market-leader potential.  

On behalf  of  the Board  of  Directors  and our  employees,  I would like  to thank 
you for your continued support. 

Sincerely, 

Chang H. Ahn, Ph.D. 
Chairman  

 
 
 
 
 
 
 
 
  __________________________________________________________________________________________________  

UNITED STATES 

SECURITIES AND EXCHANGE COMMISSION 

Washington, D.C. 20549 

FORM 10-K 

(Mark One) 

 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
SECURITIES EXCHANGE ACT OF 1934 
For the fiscal year ended December 31, 2012 

OR 

 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF 

THE SECURITIES EXCHANGE ACT OF 1934 

For the transition period from              to              

Commission File No.:001-34079 

Rexahn Pharmaceuticals, Inc. 

(Exact name of registrant as specified in its charter) 

Delaware 
(State or other jurisdiction of incorporation or organization)    

11-3516358 
(I.R.S. Employer Identification Number) 

15245 Shady Grove Road, Suite 455 
Rockville, MD 20850 
(Address of principal executive offices, including zip code) 

Telephone: (240) 268-5300 
(Registrant’s telephone number, including area code) 

Securities registered pursuant to Section 12(b) of the Exchange Act: 

Title of Each Class 
Common Stock, $0.0001 par value per share 

Name of Each Exchange on Which Registered 
NYSE AMEX 

Securities registered pursuant to Section 12(g) of the Exchange Act: 
None 
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined by Rule-405 of the Securities Act    Yes   No 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act   
Yes   No  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities 

1 

    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
  
  
 
 
 
Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), 
and (2) has been subject to such filing requirements for the past 90 days. 
Yes   No  

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every 
Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the 
preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes  No  

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not 
be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III 
of this Form 10-K or any amendment to this Form 10-K. [    ] 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller 
reporting company. See definition of “accelerated filer,” “large accelerated filer” and “smaller reporting company” in Rule 12b-2 of 
the Exchange Act. (Check one): 

Large Accelerated Filer 
Non-Accelerated Filer 
(Do not check if a smaller reporting company) 

 
 

Accelerated Filer 
Smaller reporting company 

 
 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). 
Yes  No  

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price 
at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the 
registrant’s most recently completed second fiscal quarter: As of June 30, 2012, the aggregate market value of the registrant’s 
common stock held by non-affiliates of the registrant was $24,426,818 based on the closing price reported on NYSE Amex.   

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date:   

Class 
Common Stock, $0.0001 par value per share 

Outstanding as of March 22, 2013 
119,428,989 shares 

DOCUMENTS INCORPORATED BY REFERENCE 

Document 
Portions of the registrant’s Proxy Statement for the Annual 
Meeting of Stockholders to be held on June 10, 2013 

Parts Into Which Incorporated   
Part III 

2 

    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
  
  
 
 
Cautionary Statement Regarding Forward-Looking Statements.    This Annual Report on Form 10-K contains 
statements (including certain projections and business trends) accompanied by such phrases as “believe,” “estimate,” 
“expect,” “anticipate,” “will,” “intend” and other similar expressions, that are “forward-looking statements” as defined 
in the Private Securities Litigation Reform Act of 1995.    We caution that forward-looking statements are based 
largely on our expectations, and are subject to a number of known and unknown risks and uncertainties that are 
subject to change based on factors which are, in many instances, beyond our control.  Actual results, performance or 
achievements may differ materially from those contemplated, expressed, or implied by the forward-looking 
statements.   

The following factors, among others, could cause our financial performance to differ materially from that 

expressed in such forward-looking statements: 

• 

• 

• 

• 

• 

• 

• 

our lack of profitability and the need for additional capital to operate our business; 

our ability to obtain the necessary U.S. and worldwide regulatory approvals for our drug candidates; 

successful and timely completion of clinical trials for our drug candidates; 

demand for and market acceptance of our drug candidates; 

the availability of qualified third-party researchers and manufacturers for our drug development programs; 

our ability to develop and obtain protection of our intellectual property; and 

other risks and uncertainties, including those set forth herein under the caption “Risk Factors” and those detailed from 
time to time in our filings with the Securities and Exchange Commission.   

These  forward-looking  statements  are  made  only  as  of  the  date  hereof,  and  we  undertake  no  obligation  to 

update or revise the forward-looking statements, whether as a result of new information, future events or otherwise.   
The  safe  harbors  for  forward-looking  statements  provided  by  the  Private  Securities  Litigation  Reform Act  are 
unavailable  to  issuers  of  “penny  stock.”    Our  shares  may  be  considered  a  penny  stock  and,  as  a  result,  the  safe 
harbors may not be available to us. 

    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
TABLE OF CONTENTS 

PART I 
    Item 1  Description of business 
    Item 1A  Risk Factors 
    Item 1B  Unresolved Staff Comments 
    Item 2  Description of Property 
    Item 3 
    Item 4  Mine Safety Disclosures 

Legal Proceedings 

Selected Financial Data 

PART II 
    Item 5  Market for Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities 
    Item 6 
    Item 7  Management’s Discussion and Analysis of Financial Condition and Results of Operation 
    Item 7A  Qualitative and Quantitative Disclosures About Market Risk 
Financial Statements and Supplementary Data 
    Item 8 
    Item 9 
Changes In and Disagreements with Accountants on Accounting and Financial Disclosure 
    Item 9A  Controls and Procedures 
    Item 9B  Other Information 

PART III 
    Item 10  Directors, Executive Officers, and Corporate Governance 
    Item 11  Executive Compensation 
    Item 12  Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters     
    Item 13  Certain Relationships and Related Transactions; and Director Independence   
    Item 14  Principal Accounting Fees and Services 
    Item 15  Exhibits, Financial Statement Schedules 

SIGNATURES 

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Item 1.    Description of Business 

PART I 

Any  references  to  “we,”  “us,”  “our,”  the  “Company”  or  “Rexahn”  shall  mean  Rexahn 

Pharmaceuticals, Inc. 

We  are  a  development  stage  biopharmaceutical  company  focusing  on  the  development  of  novel 
treatments  for  cancer  to  patients  worldwide.    Our  mission  is  to  discover  and  develop  new  medicines  for 
diseases  that  plague  patients  with  no  effective  therapies,  particularly  high  mortality  cancers.    Our  pipeline 
features one drug candidate in Phase II clinical trials, two oncology candidates which may begin Phase I in 
the  next  twelve  months,  and  several  other  drug  candidates  in  pre-clinical  development.    Our  strategy  is  to 
continue building a significant product pipeline of innovative medicines that we will commercialize alone or 
with  pharmaceutical  partners.    In  addition,  we  have  two  central  nervous  system  (“CNS”)  candidates, 
Serdaxin and Zoraxel, that are in Phase II clinical development and we are exploring various options to fund 
the  further  development  of  these  two  compounds.    For  a  description  of  our  pipeline  drug  candidates,  see 
“Our Pipeline Drug Candidates” in this Item 1. 

Our  principal  corporate  office  is  located  at  15245  Shady  Grove  Road,  Suite  455,  Rockville, 

Maryland 20850 in Maryland’s I-270 technology corridor.    Our telephone number is (240) 268-5300. 

Rexahn  currently  has  three  clinical  stage  oncology  candidates.  The  first  candidate,  Archexin,  is  an 
inhibitor  of  the  protein  kinase  Akt-1.  Akt-1  plays  critical  roles  in  cancer  cell  proliferation,  survival, 
angiogenesis, metastasis, and drug resistance.    Archexin received “orphan drug” designation from the U.S. 
Food  and  Drug  Administration  (“FDA”)  for  five  cancer  indications  (renal  cell  carcinoma  (“RCC”), 
glioblastoma,  ovarian  cancer,  stomach  cancer  and  pancreatic  cancer).    The  FDA  orphan  drug  program 
enables expedited FDA review or approval process, seven years of marketing exclusivity after approval and 
tax  incentives  for  clinical  research.    Archexin has  completed  a  Phase  IIa  clinical  trial  for  the  treatment  of 
pancreatic cancer and we are expected to expand our Phase II program by initiating Phase IIa clinical trials for 
chemo-resistant solid tumors and hematological malignancies in the second half of 2013. 

Another  clinical  stage  candidate  is  RX-3117,  which  is  a  small  molecule,  new  chemical  entity 
nucleoside  compound  that  has  an  anti-metabolite  mechanism  of  action,  and  has  therapeutic  potential  in  a 
broad  range  of  cancers,  including  colon,  lung,  and  pancreatic  cancer.    RX-3117  completed  an  exploratory 
Phase  I  clinical  study  in  2012  that  demonstrated  the  oral  bioavailability  of  RX-3117  in  humans  with  no 
adverse effects reported in the study.    We anticipate that RX-3117 may enter Phase I clinical trials in 2013.   
Rexahn  has  a  partnership  with  Teva  Pharmaceuticals  Industries,  Limited  (“Teva”)  for  the  development  of 
RX-3117. 

RX-5902  is  another  clinical  stage  oncology  candidate  that  is  a  first-in-class  small  molecule  that 
inhibits  the  phosphorylation  of  p68  RNA  helicase,  a  protein  that  plays  a  key  role  in  cancer  growth, 
progression,  and  metastasis.    In  July,  2012  Rexahn  submitted  an  Investigational  New  Drug  (“IND”) 
Application to the FDA for RX-5902. On November 21, 2012, we were issued  a  United  States patent 
(No.  8,314,100), 
aminocarbonyl]-4-(hetero) 
arylpiperazine  derivatives,”  which  covers  our  quinoxalinyl-piperazine  compounds,  the  process  for 
the  preparation  of  such  compounds  and  their  pharmaceutical  composition.  The  patent  includes 
RX-5902.” RX-5902 may enter Phase I clinical trials in the first half of 2013.     

alkoxyquinoxalinyl) 

“1-[6,7-substituted 

titled 

Serdaxin  is  a  developmental  stage  drug  candidate  for  major  depressive  disorder  (“MDD”).  Rexahn 
completed  a  300  patient  Phase  IIb  clinical  trial  of  Serdaxin  in  MDD  in  2011.    On  November  4,  2011,  we 
released the results of the clinical trial which showed Serdaxin did not demonstrate efficacy compared to a 
placebo group as measured by the Montgomery-Asberg Depression Rating Scale (“MADRS”).    At this point, 
we are currently not allocating resources to further develop Serdaxin to treat MDD and are looking for partners 
who will fund the clinical development of Serdaxin.   

1 

 
 
 
 
 
 
 
 
 
 
Zoraxel  is  a  developmental  stage  drug  for  sexual  dysfunction  that  directly  modulates  the  sexual 
activity control center in the brain.    The Phase IIa study was completed in May 2009 with positive results for 
patients for erectile dysfunction (“ED”).    Zoraxel is an immediate release formulation of clavulanic acid, the 
same active ingredient found in Serdaxin.    Given the reported results of the Serdaxin Phase IIb clinical trial, 
we are looking for partners who will fund the clinical development of Zoraxel. 

Company Background 

Our  Company  resulted  from  a  merger  of  Corporate  Road  Show.Com  Inc.,  originally  a  New  York 
corporation  (“CPRD”)  which  was  formed  in  November  1999,  and  Rexahn,  Corp,  a  Maryland  corporation 
immediately  after  giving  effect  to  a 1-for-100  reverse  stock  split  and  the  reincorporation  of  CPRD  as  a 
Delaware  corporation  under  the  name  “Rexahn  Pharmaceuticals,  Inc.”  with  Rexahn,  Corp  surviving  as  a 
wholly owned operating subsidiary of ours (the “Merger”).    The Merger was effective as of May 13, 2005.   
On September 29, 2005, Rexahn, Corp merged with and into us, and Rexahn, Corp’s separate existence was 
terminated. 

Rexahn, Corp was founded in March 2001 and began as a biopharmaceutical company focusing on 
oncology drugs.    Dr. Chang Ahn, our founding CEO and Chairman of the Board of Directors, is a former 
FDA  reviewer,  and  NCI  research  scientist,  helped  guide  initial  research  and  commercialization  efforts  in 
targeted  cancer  drugs.    In  February  of  this  year,  Dr.  Peter  Suzdak,  was  hired  by  Rexahn  to  become  CEO.   
Dr.  Suzdak  has  extensive  experience  in  drug  development  and  developing  therapies  for  various  diseases, 
including cancer and other disorders. 

Industry and Disease Markets   

Market Overview 

Our primary research and development focuses on therapeutic for treating cancer.    Our strategy is to 
develop  innovative  drugs  that  alter  the  signaling  pathways  implicated  in  these  diseases,  and  thereby  help 
patients regain an improved quality of life. 

According to the Center for Disease Control and Prevention, cancer claims the lives of more than half 
a million Americans each year and is the second leading cause of death among Americans.    In 2010, the NCI 
estimated that the overall cost of cancer was $264 billion and approximately 1.7 million new cancer cases are 
estimated in 2013.1    Global sales of cancer drugs are predicted to grow to $70 billion by 2018 in the seven 
major markets, driven mainly by commercialization of molecular targeted therapies.2     

Current Cancer Treatments 

The life-threatening nature of cancer, and the various ways of trying to treat cancer to save lives, has 
led to treatment(s) with surgery, radiation therapy, and chemotherapy.    Surgery is widely used to treat cancer; 
however, there may be related or significant complications and surgery may be ineffective if metastasis has 
occurred.    Radiation  therapy,  or  radiotherapy,  can  be  highly  effective.    Ionizing  radiation  deposits  energy 
that injures or destroys cells in the area being treated by damaging their genetic material, making it impossible 
for  these  cells  to  continue  to  grow.    Although  radiation  damages  both  cancer  cells  and  normal  cells,  the 
normal cells are generally able to repair themselves and function properly.    Cytotoxic cancer drugs destroy 
cancer cells by interfering with various stages of the cell division process.    However, many current cytotoxic 
chemotherapy  drugs  have  limited  efficacy  and  debilitating  adverse  side  effects  and  may  result  in  the 
development of multi-drug resistance.   

___________________________________________ 
1. Cancer Facts and Figures 2013 (American Cancer Society) 
2. Cancer Market and Definition Overview, 2009 (Datamonitor). 

2 

 
 
 
 
 
 
 
 
 
 
 
 
 
Unmet Needs in Cancer   

Despite  significant  advances  in  cancer  research  and  treatments,  high  unmet  needs  still  remain 

including:   

•  Long-term  management  of  cancers:    Surgery,  chemotherapy  or  radiation  therapy  may  not 
result  in  long-term  remission,  though  surgery  and  radiation  therapies  are  considered  effective 
methods  for  some  cancers.    Therefore,  there  is  a  need  for  more  effective  drugs  and  adjuvant 
therapies to treat relapsed and refractory cancers. 

•  Multi-drug resistance: Multi-drug resistance is a major obstacle in effectively treating various 

cancers. 

•  Debilitating  toxicity  by  chemotherapy:  Chemotherapy  as  a  mainstay  of  cancer  treatment 

induces severe adverse reactions and toxicities, affecting quality of life or life itself. 

Archexin:    First-in-class Anticancer Akt Inhibitor 

Archexin is a first-in-class, potent inhibitor of the Akt protein kinase-1 (Akt) in cancer cells. Archexin 
has FDA orphan drug designations for five cancers (Renal cell carcinoma, glioblastoma, and cancers of the 
ovary, stomach and pancreas).    Multiple indications for other solid tumors may also be pursued. Archexin is 
differentiated by its ability to inhibit both activated and inactivated forms of Akt, and to potentially reverse 
the  drug  resistance  observed  with  the  protein  kinase  inhibitors.    Other  targeted  drugs  may  only  inhibit 
inactivated  Akt  and  be  vulnerable  to  development  of  drug  resistance.    Akt  activation  plays  a  key  role  in 
cancer cell proliferation, survival, angiogenesis and drug resistance.    Akt is over-activated in many human 
cancers (e.g., breast, colorectal, gastric, pancreatic, prostate, and melanoma cancers).    A method to control 
the  Akt  activity  involves  inhibition  of  signaling  molecules  upstream  of  Akt  in  cancer  cells  (e.g.,  EGFR  or 
VEGFR  inhibitors).    In  this  case,  only  the  activity  of  native  Akt  is  indirectly  affected.    However,  signal 
transmission  for  cancer  progression  and  resistance  occurs  when  Akt  is  activated,  thus  inhibition  of  the 
activated Akt becomes more important.    Archexin inhibits both activated and native Akt. 

Archexin is an antisense oligonucleotide compound that is complementary to Akt mRNA, and highly 
selective for inhibiting mRNA expression and leading to reduced production of Akt protein.    Archexin has 
demonstrated  excellent  safety,  tolerability  and  minimal  side  effects  in  a  Phase  I  study  in  patients  with 
advanced cancers, where Grade 3 fatigue was the only dose-limiting toxicity and no significant hematological 
abnormalities were observed. The main objectives of the Phase I study were to determine maximum tolerated 
dose,  dose  limiting  toxicity,  and  pharmacokinetic  parameters  for  Archexin  monotherapy.    The  Archexin 
Phase I study design was an open label, single arm ascending dose, safety and tolerability study.     

An open label 2-stage Phase IIa study for Archexin was designed to assess the safety and efficacy of 
Archexin in combination with gemcitabine.    Stage 1 was the dose finding portion and Stage 2 was the dose 
expansion portion using the dose identified in Stage 1 to be administered with gemcitabine.    The study enrolled 
31 subjects aged 18-65 with metastatic pancreatic cancer at nine centers in the United States and India.    The 
primary endpoint was overall survival following four cycles of therapy with a six month follow-up.    For those 
evaluable  patients,  the  study  demonstrated  that  treatment  with  Archexin  in  combination  with  gemcitabine 
provided  a  median  survival  rate  of  9.1  months  compared  to  the  historical  survival  data  of  5.65  months  for 
standard  single  agent  gemcitabine  therapy.      The  most  frequent  reported  adverse  events  were  constipation, 
nausea, abdominal pain and pyrexia, regardless of relatedness.    Rexahn is evaluating options for advancing 
Archexin, including  initiating  Phase  IIa  clinical  trials  for  chemo-resistant  solid  tumors  and  hematological 
malignancies in the second half of 2013. 

The Company has been issued a U.S. patent for Archexin that covers composition of matter and broad 
claims for the nucleotide sequences of the antisense compounds that target and inhibit the expression of Akt 
in human tissues or cells, and the method of using the compounds to induce cytotoxicity in cancer cells. 

3 

 
 
 
 
 
 
 
 
 
 
 
 
RX-3117: Small Molecule, New Chemical Entity Nucleoside 

RX-3117 is a small molecule, new chemical entity nucleoside compound that has an anti-metabolite 
mechanism  of  action,  and  has  therapeutic  potential  in  a  broad  range  of  cancers,  including  colon,  lung,  and 
pancreatic cancer.    RX-3117 completed an exploratory Phase I clinical study in 2012 that demonstrated the 
oral  bioavailability  of  RX-3117  in  humans,  and  there  were  no  adverse  effects  reported  in  the  study.    We 
anticipate that RX-3117 may enter Phase I clinical trials in 2013.     

Rexahn  has  a  partnership with Teva  for  the  development  of  RX-3117.    In  2009,  we  closed  on the 
Research and Executive License Option (“RELO”) and a Purchase Agreement. The investment by TEVA is 
restricted to supporting the research and development program for the development of RX-3117.    We will be 
eligible  to  receive  royalties  on  net  sales  of  RX-3117  worldwide.  On  January  19,  2011,  we  entered  into  a 
second  amendment  to  the  Purchase  Agreement,  whereby  Teva  purchased  2,334,515  shares  of  our  common 
stock for $3.95 million.    This second amendment also provided for a possible third investment by Teva, in 
the amount of $750,000. On December 7, 2012, Teva exercised the third investment option, which constituted 
the final closing of the Purchase Agreement, and we issued 2,083,333 shares for $750,000.    On December 
27,  2012  we  received  $926,000  from  Teva  pursuant  to  a  second  amendment  to  the  RELO  for  the  further 
development of RX-3117.    Pursuant to the RELO, if the IND is filed and RX-3117 further progresses into 
clinical development, Rexahn will receive milestone payments from Teva.       

RX-5902: First In Class p68 RNA Inhibitor 

  Phosphorylated  P-68  is  highly  expressed  in  cancer  cells,  but  not  in  normal  cells.   

RX-5902  is  another  oncology  candidate  that  is  a  first-in-class  small  molecule  that  inhibits  the 
phosphorylation  of  p68  RNA  helicase,  a  protein  that  plays  a  key  role  in  cancer  growth,  progression,  and 
metastasis. 
Phosphorylated p68 results in up-regulation of cancer related genes and a subsequent proliferation or tumor 
growth of cancer cells.    RX-5902 selectively blocks Phosphorylated p68 thereby decreasing the proliferation 
or growth of cancer cells.    In preclinical tissue culture models and in-vivo xenograft models, RX-5902 has 
demonstrated synergism with cytotoxic agents and activity against drug resistant cancer cells.    In July, 2012 
Rexahn submitted an Investigational New Drug Application to the FDA for RX-5902.    RX-5902 may enter 
clinical trials in the first half of 2013.   

Market Opportunity 

There are several factors favorable for commercializing new cancer drugs that may be first-in-class or 

market leaders, including: 

•  Expedited Regulatory or Commercialization Pathways.    Drugs for life-threatening diseases 
such  as  cancer  are  often  treated  by  the  FDA  as  candidates  for  fast  track,  priority  and 
accelerated  reviews.    Expedited  regulatory  review  may  lead  to  clinical  studies  that  require 
fewer patients, or expedited clinical trials.     

•  Favorable  Environment  for  Formulary  Access  and  Reimbursement.    Cancer  drugs  with 
proven efficacy or survival benefit, and cost-effective clinical outcomes would be expected to 
gain  rapid  market  uptake,  formulary  listing  and  payer  reimbursement.    In  addition,  drugs 
that  have  orphan  designations  are  generally  reimbursed  by  insurance  companies  given  that 
there are few, if any, alternatives.     

•  Focus  on  Specialty  Markets.    The  marketing  of  new  drugs  to  specialty  physicians  can  be 
accomplished  with  a  specialty  sales  force  that  requires  fewer  personnel  and  lower  related 
costs  than  a  typical  sales  force  that  markets  to  primary  care  physicians  and  general 
practitioners.   

4 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Our Strategy   

Our strategy has several key components: 

Develop innovative therapeutics with the potential to be first-in-class or market leaders 

We  plan  to  focus  our  R&D  pipeline  on  potential  first-in-class,  or  market  leading  compounds  for 
treatment of cancer.    By expanding the breadth and depth of our oncology pipeline, we aim to develop an 
industry-leading  oncology  therapeutics  franchise.    Our  pipeline  spans  the  major  classes  of  cancer  drugs  – 
molecular  targeted  therapies,  signal  transduction  and  multi-kinase  inhibitors,  nano-medicines  for  target 
delivery of compounds, and small molecule cytotoxic compounds. Differentiated target product profiles and 
proprietary discovery and research technology platforms further support these strategic efforts.     

Target Signal Transduction Molecules with Multiple Drug Candidates 

We plan to expand our oncology candidate R&D pipeline and introduce several new signal inhibitor 
drugs  into  clinical  trials  over  the  next  several  years.    By  identifying  and  characterizing  the  genes  and 
proteins  that  control  the  signaling  pathways  and  gene  expression  of  cancer  cells,  we  seek  to  develop 
DNA/RNA-based and small-molecule drugs to treat a broad range of diseases caused by abnormal expression 
or functions of those genes and proteins.     

Establish Partnerships with Large Pharmaceutical Companies 

In  September  2009,  we  closed  on  licensing  and  stock  purchase  agreements  with  Teva  for  the 
development  of  our  novel  anti-cancer  compound,  RX-3117.  The  companies  reached  an  agreement  with 
respect  to  the  commercialization  and  development  of  RX-3117.    In  January,  2011,  we  closed  on  an 
additional private placement with Teva, pursuant to the 2009 stock purchase agreement, which was amended 
to  increase  the  amount  of  Teva’s  investment  for  the  further  development  of  RX-3117  and  provided  for  a 
possible third investment by Teva.    On December 7, 2012, Teva exercised its option and completed a third 
investment of our common stock and provided additional funding for the development of RX-3117.    To date, 
Teva has invested approximately $9.1 million with Rexahn, and currently owns approximately 6.3% of our 
outstanding  common  stock.    We  seek  to  establish  strategic  alliances  and  partnerships  with  large 
pharmaceutical companies for the development of other drug candidates.     

Clinically Develop Drug Candidates as Orphan Drugs to Reduce Time-to-Market 

Under  the  Orphan  Drug  Act,  the  FDA  may  expedite  approval  of  new  drugs  that  treat  diseases 

affecting  less than  200,000  patients each  year.    This category  of  diseases is called  an “orphan indication.”   
Incentives in the Orphan Drug Act include a faster time-to-market of the drug (with FDA approval possible 
after Phase II trials instead of Phase III trials) and seven years of drug marketing exclusivity for the sponsor.   
We  plan  to  develop  drug  candidates  initially  for  orphan  category  cancers  in  order  to  reduce  the 
time-to-market. 

In-License Unique Technology 

We  continually  review  opportunities  to  in-license  and  advance  compounds  in  oncology  that  have 

value creating potential and will strengthen our clinical development pipeline.     

Capitalize on Our Management Team’s Expertise for Drug Development and Product Commercialization 

Our  management  team  possesses  clinical  development  experience  in  oncology  and  several  other 
therapeutic  areas  that  facilitates  strategic  approaches  to  and  competitive  advantages  in,  the  design,  risk 

5 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
assessment,  and  implementation  of  drug  development  programs.  We  also  have  prior  experience  in 
pharmaceutical alliances, product launches and marketing. 

Our Pipeline Drug Candidates 

We  have  three  clinical  stage  drug  candidates,  and  several  pre-clinical  drugs,  consisting  of  the 

following: 

Clinical Stage Pipeline: 

(1)  Archexin: First-in-class anticancer Akt inhibitor 

(2)  RX-3117: Small molecule anticancer DNA synthesis Inhibitor 

(3)  RX-5902: Small molecule anticancer p68 RNA helicase regulator 

Pre-clinical Pipeline: 

(1) RX-0201-Nano: Nanoliposomal anticancer Akt inhibitor 

(2) RX-0047-Nano: Nanoliposomal anticancer HIF-1 alpha inhibitor 

(3) RX-21101: Nano-polymer Anticancer 

We have discussed our clinical stage pipeline in detail above. 

Pre-clinical Pipeline 

Our pre-clinical pipeline includes: 

(1) RX-0201-Nano: Nanoliposomal anticancer Akt inhibitor 

RX-0201,  the  active  ingredient  of  Archexin,  is  a  first-in-class,  potent  inhibitor  of  the  Akt  protein 
kinase.    RX-0201-Nano is a nanoliposomal product of RX-0201 with high incorporation efficiency and good 
stability.    Nanoliposomal  delivery  of  RX-0201  may  provide  significant  clinical  benefits  including  targeted 
higher cellular uptake, extended circulation time, reduced drug-related toxicity, and improved efficacy.   

(2) RX-0047-Nano: Nanoliposomal anticancer HIF-1α inhibitor 

RX-0047 is a potent inhibitor of HIF-1α, a key transcription factor involved in cancer cell survival, 
metastasis, and angiogenesis. Studies in xenografted model have shown RX-0047 to inhibit tumor growth in 
lung and prostate and blocks metastasis.    RX-0047-Nano is a nanoliposomal product of RX-0047 with high 
incorporation and good stability. 

(3) RX-21101: Nano-polymer Anticancer Drug 

Among the prominent nano-polymer drugs in Rexahn, RX-21101(HPMA-docetaxel) is an anticancer 
drug that can overcome the downside of cytotoxic compounds, such as poor solubility, stability, and severe 
adverse  reactions.  Conjugating  water-soluble  and  non-toxic  HPMA  to  conventional  anticancer  compounds 
bolster efficacy while lowering toxicity by specific tumor targeting and increased stability in body. 

6 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competition 

We  are  developing  new  drugs  to  address  unmet  medical  needs  in  oncology.    Our  drug  candidates 

will  be  competing  with  products  and  therapies  that  either  currently  exist  or  are  expected  to  be  developed.   
Competition  among  these  products  will  be  based  on  factors  such  as  product  efficacy,  safety,  price,  launch 
timing  and  execution.    Our  competitive  position  will  also  depend  upon  our  ability  to  attract  and  retain 
qualified personnel, to obtain patent protection or otherwise develop proprietary products or processes, and to 
secure  sufficient  capital  resources  for  the  often  substantial  period  between  technological  conception  and 
commercial sales. 

There are a number of pharmaceutical and biotechnology companies, as well as academic institutions, 
government agencies and other public and private research organizations, which are conducting research and 
development  on  technologies  and  products  for  treatment  of  cancers..    Our  competitors  may  succeed  in 
developing products based on novel technologies that are more effective than ours, which could render our 
technology and products noncompetitive prior to recovery by us of expenses incurred with respect to those 
products.    For  many  of  the  same  reasons  described  above,  we  cannot  guarantee  that  we  will  compete 
successfully. 

Government Regulation 

Regulation  by  governmental  authorities  in  the  United  States  and  in  other  countries  constitutes  a 
significant  consideration  in  our  product  development,  manufacturing  and  marketing  strategies.    We  expect 
that all of our drug candidates will require regulatory approval by appropriate governmental agencies prior to 
commercialization and will be subjected to rigorous pre-clinical, clinical, and post-approval testing, as well as 
to other approval processes by the FDA and by similar health authorities in foreign countries.    U.S. federal 
regulations  control  the ongoing  safety,  manufacture,  storage,  labeling,  record  keeping,  and  marketing  of  all 
biopharmaceutical products intended for therapeutic purposes.    We believe that we are in compliance in all 
material respects with currently applicable rules and regulations. 

Obtaining governmental approvals and maintaining ongoing compliance with federal regulations are 
expected to require the expenditure of significant financial and human resources not currently at our disposal.   
We  plan to fulfill  our  short-term  needs  through  consulting  agreements  and joint  ventures  with  academic  or 
corporate partners while building our own internal infrastructure for long-term corporate growth. 

The  process  by  which  biopharmaceutical  compounds  for  therapeutic  use  are  approved  for 
commercialization in the United States is lengthy.    Many other countries have instituted an equally difficult 
approval processes.    In the United States, regulations published by the FDA require that the person or entity 
sponsoring  and/or  conducting  a  clinical  study  for  the  purpose  of  investigating  a  potential  biological  drug 
product’s  safety  and  effectiveness  submit  an  IND  application  to  the  FDA.    These  investigative  studies  are 
required for any drug product for which the product manufacturer intends to pursue licensing for marketing 
the product in interstate commerce.    If the FDA does not object to the IND application, clinical testing of the 
compound may begin in humans after a 30-day review period.    Clinical evaluations typically are performed 
in three phases. 

In  Phase I,  the  drug  is  administered  to  a  small  number  of  healthy  human  subjects  or  patients  to 
confirm its safety and to develop detailed profiles of its pharmacological and pharmacokinetic actions (i.e., 
absorption, metabolism, excretion, duration of therapeutic concentration and effects, if any). 

In  Phase II,  the  drug  is  administered  to  groups  of  patients  (up  to  a  total  of  500)  to  determine  its 
preliminary  efficacy  against  the  targeted  disease  and  the  requisite  dose  and  dose  intervals.    In  a  typical 
development program, additional animal toxicology studies precede this phase.    In some cases, the trial can 
be split into Phase IIa and  IIb studies in order to test smaller subject pools.    Some Phase I clinical studies 
may also proceed in parallel with some Phase II studies.     

7 

 
 
 
 
 
 
 
 
 
 
 
In Phase III, the drug is administered to a larger group of patients (usually 1,000 to 3,000 or more) by 
physicians  (study  site  investigators)  in  a  network  of  participating  clinics  and  hospitals.    The  extensive 
clinical testing is intended to confirm Phase II results and to document the nature and incidence of adverse 
reactions.    Studies  also  are  performed  in  patients  with  concomitant  diseases  and  medications.    Larger 
patient  populations  are  evaluated  in  Phase  III  at  multiple  study  sites  and  many  clinical  trial  programs  or 
registration studies are conducted concurrently for the sake of time and efficiency. 

After completing the clinical studies, the product developer submits the safety and effectiveness data 
generated by the studies to the FDA in the form of a New Drug Application (NDA) to market the product.    It 
is  the  responsibility  of  the  FDA  to  review  the  proposed  product  labeling,  the  pre-clinical  (animal  and 
laboratory) data, the clinical data, the facilities utilized and the methodologies employed in the manufacture of 
the product to determine whether the product is safe and effective for its intended use. 

Even  after  initial  FDA  approval  has  been  obtained,  further  studies  may  be  required  to  provide 
additional data on safety or to gain approval for expanded labeling or treatment indications.    Also, the FDA 
may  require  post-marketing  testing  and  surveillance  programs  to  monitor  the  drug’s  effects.    Side  effects 
resulting from the use of drug products may prevent or limit the further marketing of the products. 

For  marketing  outside  the  United  States,  we  will  be  subject  to  foreign  regulatory  requirements 
governing human clinical trials and marketing approval for drugs.    The requirements relating to the conduct 
of clinical trials, product licensing, pricing and reimbursement vary widely from country to country. 

Certain drugs are eligible in the United States for designation by the FDA as “orphan” drugs if their 
use  is  intended  to  treat  a  disease  that  affects  fewer  than  200,000 persons  in  the  U.S. or  the  disease  affects 
more  than  200,000 persons  in  the  United  States  but  there  is  no  reasonable  expectation  that  the  cost  of 
developing and marketing a drug will be recovered from the U.S. sales of such drug.    In order for a sponsor 
to obtain orphan designation for a drug product, an application must be submitted for approval to the FDA’s 
Office  of  Orphan  Products  Development.    The  approval  of  an  application  for  orphan  designation  is  based 
upon the information submitted by the sponsor.    A drug that has obtained orphan designation is said to have 
“orphan  status.”    The  approval  of  an  orphan  designation  request  does  not  alter  the  standard  regulatory 
requirements  and  process  for  obtaining  marketing  approval.    Safety  and  efficacy  of  a  compound  must  be 
established through adequate and well-controlled studies. 

Orphan drugs may obtain FDA approval after successful Phase II trials, rather than after completion 
of  Phase  III  trials,  resulting  in  faster  time-to-market  for  those  drugs.    If  a  sponsor  obtains  orphan  drug 
designation for a particular compound and is the first to obtain FDA regulatory approval of that compound, 
then that sponsor is granted marketing exclusivity for a period of seven years. 

Sales and Marketing 

Rexahn  plans  to  develop  unique  and  differentiated  drugs  that  are  first-in-class  or  potential  market 
leaders.    We  may  develop  cancer  drugs  for  orphan  indications  initially,  and  then  expand into  more  highly 
prevalent cancers.    Currently, Archexin has Orphan drug designation for five cancer indications. For drugs 
that  require  larger  pivotal  trials  and/or  large  sales  force,  Rexahn  seeks  alliances  and  corporate  partnerships 
with larger pharmaceutical firms.   

Research Technologies 

Our  research  technologies  are  focused  on  our  proprietary  multi-target  aimed  ligands  platform  and 
nano-based  drug  delivery.  For  a  discussion  of  collaboration  arrangements  pursuant  to  which  we  obtain 
research  and  development  services  from  universities,  research  institutions  and  other  organizations,  see 
“Collaboration and License Agreements” in this item. 

8 

 
 
 
 
 
 
 
 
 
 
 
 
The Inhibitors of Multi-Expression Signals (TIMES) 

TIMES is Rexahn’s unique ligand discovery platform targeting multi-expression signals. Since cancer 
is a complex disease caused by multiple factors as well as genetic modifications, cancer treatment involves a 
combination of drugs with different mechanisms of action, which compound degree and extent of toxicities.   
Rexahn’s approach is to control multiple targets important for cancer proliferation with a single agent.    In 
doing  so,  Rexahn  utilizes  a  proprietary,  genomics-based  integrated,  gene  expression  system  to  identify 
potentially important targets that control multiple genes or signaling events in cancer cells.   

3-D Gateway of Ligand Discovery (3-D GOLD) 

3D-GOLD is a drug discovery platform that integrates 3-D natures of molecular modeling, databases 
of chemicals and proteins, and ligand filtering and generation. The chemical database contains 3D structures 
of  about  7  million  compounds.  Rexahn’s  proprietary  quantitative  structure-activity  relationship  tool  for 
innovative  discovery  and  docking  tools  are  parts  of  the  platform.  The  filtering  module  is  a  powerful 
component  to  determine  similarity  in  pharmacophore  and  3D  fingerprinting,  while  ligand  generation  helps 
optimize the leads. 

Nano-medicine Drug Delivery   

Rexahn  has  developed  unique  proprietary  drug  delivery  nano-systems  that  may  increase  the 

availability of a drug at the disease site, minimize adverse reactions, and/or provide longer duration of action.   
Rexahn is currently testing multiple nanoliposomal- and nanopolymer-based anticancer drugs.     

Manufacturing and Distribution 

We  do  not  currently  have  the  resources  required  for  commercial  manufacturing  of  our  drug 
candidates.    We  currently  outsource  the  manufacturing  of  drug  substances  and  drug  products  for  our  drug 
candidates.    We believe that there are a limited number of  manufacturers that could manufacture our drug 
candidates.    We  have  no  current  plans  to  build  internal  manufacturing  capacity  for  any  product.   
Manufacturing will be accomplished through outsourcing or through partnerships with large pharmaceutical 
companies.    We do not have any specific distribution plans at this time.     

Intellectual Property   

Proprietary  patent  and  intellectual  property  (IP)  protection  for  our  drug  candidates,  processes  and 
know-how  is  important  to  our  business.  We  aggressively  prosecute  and  defend  our  patents  and  proprietary 
technology.  Rexahn  has  several  U.S.  and  international  patents  issued  for  broad  IP  coverage  of  our  drug 
candidates in cancer, CNS, behavioral and mood disorders, neuroprotection and sexual dysfunction, effective 
until  2020  to  2030.  In  2012,  we  were  granted  two  US  patents  and  two  foreign  patents  for  our  oncology 
candidates.    Additional U.S., Europe, and other foreign patents are pending.  We also rely upon trade secrets, 
know-how,  continuing  technological  innovation  and  licensing  opportunities  to  develop  and  maintain  our 
competitive position. 

Rexahn  owns  US  patents  for  its  clinical  and  preclinical  candidates  related  to  RX-3117,  Archexin, 
RX-5902,  and  RX-0047.  In  addition,  Rexahn  owns  issued  patents  in  multiple  foreign  countries related  to 
RX-3117,  Archexin,  RX-0047  and  RX-5902.   Additional  US  and/or  foreign  patent  applications  related  to 
Archexin,  RX-3117,  RX-5902,  RX-0047,  and  RX-21101  are  pending. There  are  also  issued  patents  and 
pending applications in US and foreign countries related to Zoraxel and Serdaxin 

In  2012,  we  were  granted  two  US  and  two  foreign  patents.    The  first  US  patent  was  for 
quinoxalinyl-piperazine compounds, which includes RX-5902, and the second US patent was a continuation 
patent  to  cover  more  isoquinolinamine  compounds,  a  class  of  potent  anti-cancer  compounds.    The  first 
foreign  patent  granted  was  for  quinoazoline  derivatives  in  Japan,  and  the  second  patent  was  for  novel 
anticancer  isoquinolinamie  compounds  in  Europe.    All these  patents  were  oncology  patents  which  provide 
protection for our oncology candidates and formulations. 

9 

 
 
 
 
 
 
 
 
 
 
 
 In  February 2005,  we  licensed-in  CNS-related  intellectual  property  from  Revaax  Pharmaceuticals, 
LLC.  The  intellectual  property  rights  acquired  cover  use  of  certain  compounds  for  anxiety,  depression, 
aggression, cognition, Attention Deficit Hyperactivity Disorder, neuroprotection and sexual dysfunction.  See 
"Collaboration and License Arrangements" in this Item for additional information. 

is 

Rexahn 

the  exclusive 

licensee  of  all  four  US  and  several  foreign  patents  related 
to Serdaxin.   Rexahn is the exclusive licensee of two issued US patents related to Zoraxel.   Rexahn is also 
the exclusive licensee of additional pending US and/or foreign patent applications related to Zoraxel and/or 
Serdaxin.   See “Collaboration and License Arrangements” in this Item for additional information. 

Collaboration and License Arrangements 

We  have  numerous  collaborative  research  and  development  relationships  with  universities,  research 

institutions and other organizations.  A description of these material relationships is below. 

Teva Pharmaceutical Industries (“Teva”).   

In 2009, we closed on a RELO and a Securities Purchase Agreement (“Purchase Agreement”) with Teva 
for  the  development  of  our  novel  anti-cancer  compound,  RX-3117.  RX-3117  is  a  small  molecule,  new 
chemical  entity nucleoside  compound  that  has  an  anti-metabolite  mechanism  of  action,  and  has  therapeutic 
potential in a broad range of cancers including colon, lung and pancreatic cancer.  These agreements provide 
for  the  commercialization  and  development  of  RX-3117.    Pursuant  to  the  Purchase  Agreement,  Teva 
purchased 3,102,837 shares of our common stock for $3.5 million.  We will be eligible to receive additional 
development, regulatory and sales milestone payments.  In addition, we will be eligible to receive royalties on 
net sales worldwide.  On January 19, 2011, we entered into a second amendment to the Purchase Agreement, 
where Teva  purchased  2,334,515 shares of our common  stock  for  $3.95  million.    This  second  amendment 
also provided for a possible third investment by Teva, in the amount of $750,000.    On December 7, 2012, 
Teva exercised this option, which constituted the third and final closing of the Purchase Agreement, and we 
issued 2,083,333 shares for $750,000.    On December 27, 2012, we received $926,000 from Teva pursuant to 
a second amendment to the RELO for the further development of RX-3117.   

Korea Research Institute of Chemical Technology (“KRICT”) 

On  July  13,  2009,  we  entered  a  licensing  partnership  with  KRICT  to  develop  a  synthetic  process  for 
Quinoxalines compounds.  These compounds provide selective toxicity towards hypoxic cells – cells found in 
solid  tumors  and  that  are  resistant  to  anticancer  drugs  and  radiation  therapy,  making  them  a  potential 
treatment for solid tumors.   

The University of Maryland Baltimore (“UMB”)  

On  February  1,  2007,  we  entered  into  a  Maryland  Industrial  Partnership  Agreement  with  the  UMB  to 
collaborate  with  and  sponsor  the  joint  development  of  polymer-drug  conjugates  for  cancer  therapy,  for  the 
targeted  delivery  of  cancer  drugs.  Intellectual  property  made  or  developed  under  this  agreement  is  jointly 
owned by us and UMB.   

Revaax Pharmaceuticals LLC (“Revaax”) 

On  February  10,  2005,  we  licensed  on  an  exclusive  basis,  with  the  right  to  sublicense,  all  of  the  IP  of 
Revaax,  which  includes  four  patents  and  multiple  patent  applications,  with  respect  to  certain  chemical 
structures  that  have  demonstrated  in  pre-clinical  research  the  potential  to  treat  certain  behavioral  disorders, 
such as anxiety, depression and cognitive disorders (the “Licensed Products”).  This agreement expires upon 
the expiration of the royalty term for all Licensed Products in all countries, which is no earlier than August 
2020 and could extend to August 2024.   

This  agreement  provides  for  an  initial  license  fee  and  milestone  payments  based  on  the  initiation  of 
pivotal  trials  for  disease  treatment  indication  for  licensed  products.  Furthermore,  we  will  pay  Revaax  a 
specified fee for each Licensed Product under the agreement upon receipt of the first approval by any federal, 
state or local regulatory, department, bureau or other governmental entity necessary prior to the commercial 

10 

 
 
 
 
 
 
 
 
sale of the Licensed Product (“Marketing Approval”).  Notwithstanding the milestone payment arrangement 
described above, we are not obligated to make any  milestone payment with respect to milestone events for 
which  we  receive  sublicense  revenues  and  are  obligated  to  pay  Revaax  a  percentage  of  such  sublicense 
revenues, as well as royalties for sales of Licensed Products based on net sales of the Licensed Products. 

Under the agreement we agreed to pay Revaax an initial license fee of $375,000, payable in 8 installments 
of $46,875 each over a period of 2 years from February 10, 2005. In addition, we also agreed to pay Revaax a 
number  of  one  time  payments  within  30  days  of  the  first  achievement  of  the  following  milestones,  (a) 
$500,000 with respect to the dosing of the first patient in the first Phase III clinical trial or other controlled 
study in humans of the efficacy and safety with regards to any product the manufacture, use or sale of which 
is covered by any claim of an issued and unexpired patent (the “Pivotal Trial”) within the Licensed Products, 
and $250,000 with respect to the dosing of the first patient, in the second, third, fourth and fifth Pivotal Trial, 
and $125,000 with respect to the dosing of the first patient in any subsequent Pivotal Trial, (b) $5,000,000 
with respect to the receipt of Marketing Approval, and $2,500,000 with respect to the receipt of the second, 
third,  fourth  and  fifth  Marketing  Approval  for  a  Licensed  Product,  and  $1,250,000  with  respect  to  any 
subsequent  Marketing  Approval.  We  are  not  under  an  obligation  to  make  any  payments  with  respect  to 
milestone events for which we receive any non-creditable upfront fees or milestone payments received by us 
from  any  sublicense  in  connection  with  the  development  and  commercialization  of  a  Licensed  Product  by 
such sublicense, less any license fees, milestone payments, or royalties payable by us to a third party under 
any technology acquisition agreement in connection with the development or commercialization of a Licensed 
Product, but specifically excluding any royalties revenues derived from any sublicense agreements. Also, at 
our option, we may elect to make up to 50% of any milestone payment in shares of our common stock with 
the number of shares determined by dividing the amount of the milestone portion by the fair market value of 
one share of common stock, as reasonably determined by our board of directors.   

We also agreed to pay Revaax royalty payments on all sales of the Licensed Product made to third parties. 
The  royalties  consist  of  (a)  4%  of  the  portion  of  the  aggregate  net  sales  of  the  Licensed  Product  during  a 
calendar year that is equal to or less than $250,000,000, (b) 5% of the portion of aggregate net sales of the 
Licensed Product in a calendar year that is greater than $250,000,000 but equal to or less than $500,000,000, 
(c) 6% of the aggregate sales of the Licensed Product during a calendar year that is greater than $500,000,000 
but equal to or less than $750,000,000, and (d) 7% of the aggregate net sales of the Licensed Product during a 
calendar year exceeds $750,000,000. The royalty payment obligations will expire on the later of (a) expiration 
of  any  claim  of  an  issued  and  unexpired  patent  within  the  Licensed  Products  which  has  not  been  held 
unenforceable  or  invalid  and  which  has  not  been  disclaimed  or  admitted  to  be  invalid  or  unenforceable 
through reissue or otherwise (the “Valid Claim”) that, for the licenses granted under the Agreement, would be 
infringed by the sale of such Licensed Product, and (b) 10 years after the first commercial sale of the Licensed 
Product by us, our affiliates or sublicenses anywhere in the world.   

Upon expiration of the Valid Claim for a particular Licensed Product in a particular country, each of the 
royalty  fees  will  be  reduced  by  50%  for  the  remainder  of  the  term  remaining  on  our  royalty  payment 
obligations, resulting in royalty fees of 2%, 2.5%, 3%, and 3.5%, as applicable.     

Rexgene Biotech Co., Ltd. (“Rexgene”) 

On February 6, 2003 we entered into a Research Collaboration Agreement with Rexgene to collaborate in 
the  development  of a  cancer  treatment  therapeutic  compound  denominated  RX-0201(Archexin).  We jointly 
agreed to develop a research and development plan for the purpose of registering Archexin for sale and use in 
the Republic of Korea and other Asian countries. The research and development plan would include clinical 
and animal trials to be conducted in the United States, clinical trials to be conducted in Korea and other Asian 
countries. We agreed to provide as its initial contribution to the joint development and research, a license to 
all  technology  related  to  Archexin.  Rexgene  agreed  to  provide,  as  its  initial  contribution  $1,500,000  to  be 
used by us in further development of Archexin. Rexgene agreed to pay us a royalty fee of 3% of net sales of 
licensed products related to Archexin in all countries in Asia by Rexgene or any sublicensee of Rexgene.   

The agreement was scheduled to expire upon the last to expire of all US and foreign patents presently 
or in the future issued that cover Archexin, or if no licensed patent is issued within 20 years from the date of 
execution of the agreement. A breach of the agreement by either party will afford the non-breaching party the 

11 

 
 
   
right  to  terminate  the  agreement  upon  90  days  written  notice  of  termination  specifying  the  obligations 
breached, provided that within said 90 days the breaching party does not remedy the breach.   

Total Research and Development Costs 

We have incurred research and development costs of $3,392,896 and $11,992,087 for the years ended 
December  31,  2012  and  2011  respectively.    Research  and  development  costs  primarily  consist  of  clinical 
trials and preclinical development costs, as well as payroll costs for research and development personnel.   

Employees 

We currently have 14 full-time employees, all of whom are based either at our Rockville, Maryland 
office  or  our  Germantown,  Maryland  lab  facility.    Our  employees  are  not  covered  by  any  collective 
bargaining agreement and we have never experienced a work stoppage.    We believe our relationships with 
our employees are satisfactory. 

Available Information   

Under  the  Securities  Exchange  Act  of  1934,  as  amended  (the  “Exchange  Act”),  the  Company  is 
required to file annual, quarterly and current reports, proxy statements and other information with the Securities 
and  Exchange  Commission  (the  “SEC”).  Any  document the  Company  files  with  the  SEC  may  be  read and 
copied at the SEC’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC 
at  (800) SEC-0330  for  further  information  about  the  public  reference  room.  The  SEC  maintains  a  website 
at  www.sec.gov  that  contains  reports,  proxy  and  information  statements,  and  other  information  regarding 
issuers that file electronically with the SEC.   

The Company makes available, free of charge, on its website at www.rexahn.com its Annual Report on 
Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, and all amendments thereto, as 
soon  as  reasonably  practicable  after  the  Company  files  such  reports  with,  or  furnishes  them  to,  the  SEC. 
Investors are encouraged to access these reports and the other information about the Company’s business on its 
website. Information found on the Company’s website is not part of this Annual Report on Form 10-K. The 
Company will also provide copies of its Annual Report on Form 10-K, free of charge, upon written request to 
the  Investor  Relations  Department  at  the  Company’s  main  address,  15245  Shady  Grove  Road,  Suite  455, 
Rockville MD 20850 

Also posted on the Company’s website, and available in print upon written request of any shareholder 

to the Company’s Investor Relations Department, are the charters of the standing committees of its Board. 

Item 1A.    Risk Factors. 

You should carefully consider the risks described below together with the other information included in this 
Form 10-K. Our business, financial condition or results of operations could be adversely affected by any of 
these risks. If any of these risks occur, the value of our common stock could decline. 

We  currently  have  no  product  revenues,  have  incurred  negative  cash  flows  from  operations  since 
inception, and will need to raise additional capital to operate our business. 

To  date,  we  have  generated  no  product  revenues  and  have  incurred  negative  cash  flow  from 
operations. Until we receive approval from the FDA and other regulatory authorities for our drug candidates, 
we cannot sell our drugs and will not have product revenues. Therefore, for the foreseeable future, we will 
have to fund all of our operations and capital expenditures from the net proceeds of equity or debt offerings 
we may make, cash on hand, licensing fees and grants.    We will need to raise additional money through debt 
and/or  equity  offerings  in  order  to  continue  to  develop  our  drug  candidates.  If  we  are  not  able  to  raise 
sufficient  additional  money,  we  will  have  to  reduce  our  research  and  development  activities.  We  will  first 
reduce  research  and  development  activities  associated  with  our  preclinical  compounds.  To  the  extent 

12 

 
 
  
 
 
 
 
 
 
 
 
necessary, we will then reduce our research and development activities related to some or all of our clinical 
drugs. 

Additionally,  changes  may  occur  that  would  consume  our  existing  capital  at  a  faster  rate  than 
projected,  including  but  not  limited  to,  the  progress  of  our  research  and  development  efforts,  the  cost  and 
timing  of  regulatory  approvals  and  the  costs  of  protecting  our  intellectual  property  rights.  We  may  seek 
additional financing to implement and fund other drug candidate development, clinical trial and research and 
development efforts, including Phase I clinical trials for other new drug candidates, as well as other research 
and development projects. 

We  will  need  additional  financing  to  continue  to  develop  our  drug  candidates,  which  may  not  be 
available  on  favorable  terms,  if  at  all.  If  we  are  unable  to  secure  additional  financing  in  the  future  on 
acceptable terms, or at all, we may be unable to complete our planned pre-clinical and clinical trials or obtain 
approval of our drug candidates from the FDA and other regulatory authorities. In addition, we may be forced 
to  reduce  or  discontinue  product  development  or  product  licensing,  reduce  or  forego  sales  and  marketing 
efforts and forego attractive business opportunities in order to improve our liquidity to enable us to continue 
operations.  Any  additional  sources  of  financing  will  likely  involve  the  sale  of  our  equity  securities  or 
securities convertible into our equity securities, which may have a dilutive effect on our stockholders. 

We are not currently profitable and may never become profitable. 

We have generated no revenues to date from product sales. Our accumulated deficit as of December 
31, 2012 and 2011 was $63,311,283 and $57,084,613, respectively. For the years ended December 31, 2012, 
and  2011,  we  had  net  losses  of  $6,226,670  and  $11,344,950,  respectively,  partially  as  a  result  of  expenses 
incurred  through  a  combination  of  research  and  development  activities  related  to  the  various  technologies 
under  our  control  and  expenses  supporting  those  activities.  Even  if  we  succeed  in  developing  and 
commercializing one or more of our drug candidates, we expect to incur substantial losses for the foreseeable 
future and may never become profitable. We also expect to continue to incur significant operating and capital 
expenditures and anticipate that our expenses will increase substantially in the foreseeable future, based on 
the following considerations: 

· 

· 

· 

· 

· 

continued  pre-clinical  development  and  clinical  trials  for  our  current  and  new  drug 
candidates; 

efforts to seek regulatory approvals for our drug candidates; 

implementing additional internal systems and infrastructure; 

licensing in additional technologies to develop; and 

hiring additional personnel. 

We also expect to continue to experience negative cash flow for the foreseeable future as we fund our 
operations  and  capital  expenditures.  Until  we  have  the  capacity  to  generate  revenues,  we  are  relying  upon 
outside funding resources to fund our cash flow requirements. 

We have a limited operating history. 

We are a development-stage company with a limited number of drug candidates. To date, we have not 
demonstrated an ability to perform the functions necessary for the successful commercialization of any of our 
drug candidates. The successful commercialization of our drug candidates will require us to perform a variety 
of functions, including, but not limited to: 

· 

conducting pre-clinical and clinical trials; 

13 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
· 

· 

· 

participating in regulatory approval processes; 

formulating and manufacturing products; and 

conducting sales and marketing activities. 

To  date,  our  operations  have  been  limited  to  organizing  and  staffing  our  company,  acquiring, 
developing  and  securing  our  proprietary  technology,  drug  candidate  research  and  development  and 
undertaking, through third parties, pre-clinical trials and clinical trials of our principal drug candidates. These 
operations provide a limited basis for assessment of our ability to commercialize drug candidates. 

We  may  not  obtain  the  necessary  U.S.  or  worldwide  regulatory  approvals  to  commercialize  our  drug 
candidates,  and  we  cannot  guarantee  how  long  it  will  take  for  FDA  to  review  applications  for  our  drug 
candidates. 

We will need FDA approval to commercialize our drug candidates in the U.S. and approvals from the 
FDA-equivalent regulatory authorities in foreign jurisdictions to commercialize our drug candidates in those 
jurisdictions. In order to obtain FDA approval of our drug candidates, we must submit to the FDA an NDA 
demonstrating  that  the  drug  candidate  is  safe  for  humans  and  effective  for  its  intended  use.  This 
demonstration requires significant research and animal tests, which are referred to as pre-clinical studies, as 
well as human tests, which are referred to as clinical trials. Satisfaction of the FDA’s regulatory requirements 
typically  takes  many  years,  and  depends  upon  the  type,  complexity  and  novelty  of  the  drug  candidate  and 
requires substantial resources for research, development and testing. We cannot guarantee that any of our drug 
candidates will ultimately be approved by the FDA, if they will ultimately be reviewed on an expedited or 
priority basis by the FDA, or if an expedited or priority review will significantly shorten actual FDA review 
time.  We  cannot  predict  whether  our  research  and  clinical  approaches  will  result  in  drugs  that  the  FDA 
considers  safe  for  humans  and  effective  for  indicated  uses.  Two  of  our  drug  candidates,  Archexin  and 
RX-0047, are antisense oligonucleotide (“ASO”) compounds. To date, although applications have been made 
by other companies, the FDA has not approved any NDAs for any ASO compounds for cancer treatment. In 
addition, each of Archexin, RX-0201-nano and RX-0047-nano is of a drug class (Akt inhibitor, in the case of 
Archexin and RX-0201-nano, and HIF inhibitor, in the case of RX-0047) that has not been approved by the 
FDA  to  date,  nor  have  we  submitted  such  NDA.  After  the  clinical  trials  are  completed,  the  FDA  has 
substantial discretion in the drug approval process and may require us to conduct additional pre-clinical and 
clinical testing or to perform post-marketing studies. 

In foreign jurisdictions, we must receive approval from the appropriate regulatory authorities before 
we  can  commercialize  our  drugs.  Foreign  regulatory  approval  processes  generally  include  all  of  the  risks 
associated with the FDA approval procedures described above. We cannot assure you that we will receive the 
approvals necessary to commercialize our drug candidates for sale outside the United States. 

There is no assurance as to the precise scope of our marketing exclusivity afforded under the Orphan Drug 
Act.     

Even if we have orphan drug designation for a particular drug indication, we cannot guarantee that 
another company also holding orphan drug designation will not receive FDA approval for the same indication 
before  we  do.  If  that  were  to  happen,  our  applications  for  that  indication  may  not  be  approved  until  the 
competing  company’s  seven-year  period  of  exclusivity  expired.  Even  if  we  are  the  first  to  obtain  FDA 
approval for an orphan drug indication, there are certain circumstances under which a competing product may 
be approved for the same indication during our seven-year period of marketing exclusivity, such as if the later 
product  is  shown  to  be  clinically  superior  to  the  orphan  product.  Further,  the  seven-year  marketing 
exclusivity  would  not  prevent  other  sponsors  from  obtaining  approval  of  the  same  compound  for  other 
indications or the use of other types of drugs for the same use as the orphan drug. 

14 

 
 
 
 
 
 
 
 
 
 
 
 
 
Our drug candidates are in the stages of clinical trials. 

Our drug candidates are in various stages of development and require extensive clinical testing, which 
are very expensive, time consuming and difficult to design.    Archexin, our oncology drug candidate, recently 
completed  Phase  IIa  trials  for  pancreatic  cancer.    RX-3117,  another  oncology  candidate,  completed  an 
exploratory Phase I clinical trial.    On August 6, 2012, we released the results that the study demonstrated the 
oral bioavailability of RX-3117 in humans when delivered orally to patients, and there were no adverse events 
reported in the study.    RX-5902, another drug oncology candidate, may enter Phase I clinical trials in 2013.   
In  November,  2011,  we  released  the  results  that  the  Phase  IIb  clinical  study  showed  Serdaxin  did  not 
demonstrate efficacy compared to the placebo group as measured by MADRS.    We completed our Phase IIa 
clinical trial  for  Zoraxel  and  are evaluating  how  to proceed  with the  Phase  IIb  study.    We  are  looking  for 
partners who can fund the further development, license the products or cooperate for commercialization.   

Clinical trials are very expensive, time-consuming and difficult to design and implement. 

Human clinical trials are very expensive and difficult to design and implement, in part because they 
are subject to rigorous regulatory requirements. The clinical trial process is also time-consuming. We estimate 
that clinical trials of our current drug candidates will take up to three years to complete. Furthermore, failure 
can  occur  at  any  stage  of  the  trials,  and  we  could  encounter  problems  that  cause  us  to  abandon  or  repeat 
clinical  trials.  The  commencement  and  completion  of  clinical  trials  may  be  delayed  by  several  factors, 
including, but not limited to: 

· 

· 

· 

· 

· 

· 

· 

· 

unforeseen safety issues; 

determination of dosing issues; 

lack of effectiveness during clinical trials; 

change in the standard of care of the indication being studied 

reliance on third party suppliers for the supply of drug candidate samples; 

slower than expected rates of patient recruitment; 

inability to monitor patients adequately during or after treatment; 

inability or unwillingness of medical investigators and institutional review boards to follow 
our clinical protocols; and 

· 

lack of sufficient funding to finance the clinical trials. 

We or the FDA may suspend clinical trials at any time if it appears that we are exposing participants 
to unacceptable health risks or if the FDA finds deficiencies in our IND submissions or the conduct of these 
trials. 

Additionally,  we  may  have  difficulty  enrolling  patients  in  our  clinical  trials.  If  we  experience  such 
difficulties,  we  may  not  be  able  to  complete  the  clinical  trial  or  we  may  experience  significant  delays  in 
completing the clinical trial.  

If the results of our clinical trials fail to support our drug candidate claims, the completion of development 
of  such  drug  candidate  may  be  significantly  delayed  or  we  may  be  forced  to  abandon  development 
altogether, which will significantly impair our ability to generate product revenues. 

Even if our clinical trials are completed as planned, we cannot be certain that our results will support 
our  drug  candidate claims.  Success  in  pre-clinical  testing  and  early  clinical  trials  does  not  ensure  that  later 

15 

 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
clinical trials will be successful, and we cannot be sure that the results of later clinical trials will replicate the 
results of prior clinical trials and pre-clinical testing. The clinical trial process may fail to demonstrate that our 
drug candidates are safe for humans and effective for indicated uses. This failure would cause us to abandon a 
drug  candidate  and  may  delay  development  of  other  drug  candidates.  Any  delay  in,  or  termination  of,  our 
clinical  trials  will  delay  the  filing  of  our  NDAs  with  the  FDA  and,  ultimately,  delay  our  ability  to 
commercialize our drug candidates and generate product revenues. In addition, our trial designs may involve a 
small  patient  population.  Because  of  the  small  sample  size,  the  results  of  early  clinical  trials  may  not  be 
indicative  of  future  results.  In  addition,  standard  of  care  treatments  may  change  which  would  require 
additional studies to be done. 

Our drug candidates are in various stages of development and require extensive clinical testing, 
which are very expensive, time-consuming and difficult to design. Archexin, our oncology drug candidate, 
recently completed Phase IIa trials for pancreatic cancer. RX-3117, another oncology drug candidate, 
completed an exploratory Phase I clinical trial. On August 6, 2012, we released the results that the study 
demonstrated the oral bioavailability of RX-3117 in humans when delivered orally to patients, and there were 
no adverse events reported in the study. RX-5902, another drug oncology candidate may enter Phase I clinical 
trials in 2013. In November, 2011 we released results that the Phase IIb clinical study showed that Serdaxin 
did not demonstrate efficacy compared to the placebo group as measured by MADRS. We completed our 
Phase IIa clinical trial for Zoraxel, and are evaluating how to proceed with the Phase IIb study. We are 
looking for partners who can fund the further development, license the products or cooperate for 
commercialization.   

We currently rely on Teva to provide funds for the development of RX-3117. If Teva does not continue to 
provide funding, we may not be able to continue developing this drug candidate.   

In 2009, we closed on the RELO Agreement, and the related purchase agreement, with Teva providing 
for the development of our novel anti-cancer compound, RX-3117. Pursuant to the RELO Agreement, Teva has 
the option to obtain an exclusive, world-wide license from us for the research, development, distribution and 
commercialization of RX-3117. Pursuant to the terms of the purchase agreement, Teva purchased 3,102,837 
shares of our common stock for $3.5 million in 2009, an additional 2,334,515 shares of our common stock for 
$3.95 million in 2011, and has agreed that it will exercise an option to purchase $750,000 of our common stock 
at 120% of closing market share price on or around December 7, 2012. Under these agreements, we will be 
eligible to receive additional development, regulatory and sales milestone payments. In addition, we will be 
eligible to receive royalties on net sales worldwide. Further on November 27, 2012, Teva agreed (i) to provide 
us with an additional $926,000 of research funding in our development of RX-3117 and (ii) to conduct 
additional research and development work for RX-3117 on our behalf. There can be no assurances that Teva 
will provide additional funding, if needed, to complete the development of RX-3117. If Teva decided to 
discontinue funding, we may not be able to continue developing RX-3117, and therefore, would not earn any 
royalties on the product.   

If physicians and patients do not accept and use our drugs, our ability to generate revenue from sales of 
our products will be materially impaired. 

Even if the FDA approves our drug candidates, physicians and patients may not accept and use them. 

Future acceptance and use of our products will depend upon a number of factors including: 

· 

· 

· 

· 

awareness of the drug’s availability and benefits; 

perceptions by members of the health care community, including physicians, about the safety 
and effectiveness of our drugs; 

pharmacological benefit and cost-effectiveness of our product relative to competing products; 

availability of reimbursement for our products from government or other healthcare payers; 

16 

 
 
 
 
 
 
 
 
 
 
 
· 

effectiveness of marketing and distribution efforts by us and our licensees and distributors, if 
any; and 

· 

the price at which we sell our products. 

Because we expect sales of our current drug candidates, if approved, to generate substantially all of 
our product revenues for the foreseeable future, the failure of any of these drugs to find market acceptance 
would harm our business and could require us to seek additional financing. 

Much  of  our  drug  development  program  depends  upon  third-party  researchers,  and  the  results  of  our 
clinical trials and such research activities are, to a limited extent, beyond our control. 

We  depend  upon  independent  investigators  and  collaborators,  such  as  universities  and  medical 
institutions, to conduct our pre-clinical, toxicology studies, and clinical trials. This business practice is typical 
for the pharmaceutical industry and companies like us. For example, the Phase I clinical trials of Archexin 
were  conducted  at  the  Lombardi  Comprehensive  Cancer  Center  of  Georgetown  Medical  Center  and  the 
University  of  Alabama  at  Birmingham,  with  the  assistance  of  Amarex,  LLC,  a  pharmaceutical  clinical 
research service provider who is responsible for creating the reports that will be submitted to the FDA. We 
also relied on TherImmune Research Corporation (now named Bridge Global Pharmaceutical Services, Inc.), 
a  discovery  and  pre-clinical  service  provider,  to  summarize  Archexin‘s  pre-clinical  data.  While  we  make 
every effort internally to oversee their work, these collaborators are not our employees and we cannot control 
the  amount  or  timing  of  resources  that  they  devote  to  our  programs.  These  investigators  may  not  assign 
priority  to  our  programs  or  pursue  them  as  diligently  as  we  would  if  we  were  undertaking  such  programs 
ourselves.  If  outside  collaborators  fail  to  devote  sufficient  time  and  resources  to  our  drug-development 
programs,  or  if  their  performance  is  substandard,  the  approval  of  our  FDA  applications,  if  any,  and  our 
introduction  of  new  drugs,  if  any,  may  be  delayed.  The  risk  of  completion  or  delay  of  these  studies  is  not 
within our direct control and a program delay may occur due to circumstances outside our control. A delay in 
any  of  these  programs  may  not  necessarily  have  a  direct  impact  on  our  daily  operations.  However,  to  the 
extent  that  a  delay  results  in  additional  cost  to  us,  a  higher  than  expected  expense  may  result.  These 
collaborators may also have relationships with other commercial entities, some of which may compete with 
us. If our collaborators assist our competitors at our expense, our competitive position would be harmed. 

We rely exclusively on third parties to formulate and manufacture our drug candidates, which expose us to 
a number of risks that may delay development, regulatory approval and commercialization of our products 
or result in higher product costs. 

We have no experience in drug formulation or manufacturing. Internally, we lack the resources and 
expertise to formulate or manufacture our own drug candidates. Therefore, we rely on third party expertise to 
support us in this area. For example, we have entered into contracts with third-party manufacturers such as 
UPM Pharmaceuticals, Inc. to manufacture, supply, store and distribute supplies of our drug candidates for 
our  clinical  trials.  If  any  of  our  drug  candidates  receive  FDA  approval,  we  will  rely  on  these  or  other 
third-party contractors to manufacture our drugs. Our reliance on third-party manufacturers exposes us to the 
following potential risks: 

·  We may be unable to identify manufacturers on acceptable terms or at all because the number 
of potential manufacturers is limited and the FDA must approve any replacement contractor. 
This  approval  would  require  new  testing  and  compliance  inspections.  In  addition,  a  new 
manufacturer would have to be educated in, or develop substantially equivalent processes for, 
the production of our products after receipt of FDA approval, if any. 

·  Our third-party manufacturers might be unable to formulate and manufacture our drugs in the 

volume and of the quality required to meet our clinical needs and commercial needs. 

·  Our  contract  manufacturers  may  not  perform  as  agreed  or  may  not  remain  in  the  contract 
manufacturing  business  for  the  time  required to  supply  our  clinical  trials  or  to successfully 

17 

 
 
 
 
 
 
 
 
 
 
 
produce, store and distribute our products. 

·  Drug manufacturers are subject to ongoing periodic unannounced inspection by the FDA, the 
Drug  Enforcement  Agency  (DEA),  and  corresponding  state  agencies  to  ensure  strict 
compliance  with  good  manufacturing  practice  and  other  government  regulations  and 
corresponding  foreign  standards.  We  do  not  have  control  over  third-party  manufacturers’ 
compliance  with  these  regulations  and  standards,  but  we  may  be  ultimately  responsible  for 
any of their failures. 

· 

If  any  third-party  manufacturer  makes  improvements  in  the  manufacturing  process  for  our 
products,  we  may  not  own,  or  may  have  to  share,  the  intellectual  property  rights  of 
formulation patents. 

·  A third party manufacturer may gain knowledge from working with us that could be used to 

supply one of our competitors with a product that competes with ours. 

Each  of  these  risks  could  delay  our  clinical  trials,  drug  approval  and  commercialization  and 

potentially result in higher costs and/or reduced revenues. 

We have no experience selling, marketing or distributing products and currently no internal capability to 
do so. 

We currently have no sales, marketing or distribution capabilities. While we intend to have a role in 
the commercialization of our products, we do not anticipate having the resources in the foreseeable future to 
develop global sales and marketing capabilities for all of our proposed products. Our future success depends, 
in part, on our ability to enter into and maintain collaborative relationships with other companies having sales, 
marketing and distribution capabilities, the collaborator’s strategic interest in the products under development 
and such collaborator’s ability to successfully market and sell any such products. To the extent that we decide 
not to, or are unable to, enter into collaborative arrangements with respect to the sales and marketing of our 
proposed  products,  significant  capital  expenditures,  management  resources  and  time  will  be  required  to 
establish and develop an in-house marketing and sales force with technical expertise. We cannot assure you 
that we will be able to establish or maintain relationships with third party collaborators or develop in-house 
sales  and  distribution  capabilities.  To  the  extent  that  we  depend  on  third  parties  for  marketing  and 
distribution, any revenues we receive will depend upon the efforts of such third parties, as well as the terms of 
our agreements with such third parties, which cannot be predicted at this early stage of our development. We 
cannot assure you that such efforts will be successful. In addition, we cannot assure you that we will be able 
to market and sell our products in the United States or overseas. 

Developments by competitors may render our products or technologies obsolete or non-competitive. 

We will compete against fully integrated pharmaceutical companies and smaller companies that are 
collaborating with larger pharmaceutical companies, such as Keryx Biopharmaceuticals, Genta Incorporated 
and  Imclone  Systems  Incorporated,  as  well  as  academic  institutions,  government  agencies  and  other  public 
and private research organizations. In addition, many of these competitors, either alone or together with their 
collaborative  partners,  operate  larger  research  and  development  programs  or  have  substantially  greater 
financial resources than we do, as well as more experience in: 

· 

· 

· 

· 

developing drugs; 

undertaking pre-clinical testing and human clinical trials; 

obtaining FDA and other regulatory approvals of drugs; 

formulating and manufacturing drugs; and 

18 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
· 

launching, marketing and selling drugs. 

Large  pharmaceutical  companies  such  as  Bristol-Myers  Squibb,  Eli-Lilly,  Novartis,  Pfizer  and 
Glaxo-SmithKline  currently  sell  both  generic  and  proprietary  compounds  for  the  treatment  of  cancer, 
depression  and  erectile  dysfunction.  In  addition,  companies  pursuing  different  but  related  fields  represent 
substantial  competition.  Many  of  these  organizations  have  substantially  greater  capital  resources,  larger 
research  and  development  staff  and  facilities,  longer  drug  development  history  in  obtaining  regulatory 
approvals and greater manufacturing and marketing capabilities than we do. These organizations also compete 
with us to attract qualified personnel, parties for acquisitions, joint ventures or other collaborations. 

If  we  fail  to  adequately  protect  or  enforce  our  intellectual  property  rights  or  secure  rights  to  patents  of 
others,  the  value  of  our  intellectual  property  rights  would  diminish  and  our  business  and  competitive 
position would suffer.     

Our  success,  competitive  position  and  future  revenues  will  depend  in  part  on  our  ability  and  the 
abilities  of  our  licensors  to  obtain  and  maintain  patent  protection  for  our  products,  methods,  processes  and 
other technologies,  to  preserve  our trade  secrets,  to  prevent  third  parties from  infringing  on  our  proprietary 
rights  and  to  operate  without  infringing  the  proprietary  rights  of  third  parties.  We  have  an  active  patent 
protection  program  that  includes  filing  patent  applications  on  new  compounds  to  treat  cancer  and  other 
conditions, formulations, delivery systems, and methods of making and using products, and prosecuting these 
patent applications in the United States and abroad. As patents issue, we also file continuation applications for 
some of them. Through these actions, we are building a patent portfolio of patents assigned to and licensed to 
the Company. Further, Rexahn is developing proprietary research and platforms to strengthen and expand our 
innovative pipelines. However, we cannot predict: 

· 

the degree and range of protection any patents will afford us against competitors, including 
whether third parties find ways to invalidate or otherwise circumvent our licensed patents; 

· 

if and when patents will issue in the United States or any other country; 

·  whether  or  not  others  will  obtain  patents  claiming  aspects  similar  to  those  covered  by  our 

licensed patents and patent applications; 

·  whether we will need to initiate litigation or administrative proceedings which may be costly 

whether we win or lose; 

·  whether our patents will be challenged by our competitors alleging that a patent is invalid or 
unenforceable and, if opposed or litigated, the outcome of any administrative or court action 
as to patent validity, enforceability, or scope; 

·  whether a competitor will develop a similar compound that is outside the scope of protection 
afforded  by  a  patent  or  whether  the  patent  scope  is  inherent  in  the  claims  modified  due to 
interpretation of claim scope by a court; 

·  whether there were activities previously undertaken by a licensor that could limit the scope, 

validity, or enforceability of licensed patents and intellectual property; 

·  whether  there  will  be  challenges  or  litigation  brought  by  a  licensor  alleging  breach  of  a 
license  agreement  and  its  effect  on  our  ability  to  practice  particular  technologies  and  the 
outcome of any such challenge or litigation; or 

·  whether a competitor will assert infringement of its patents or intellectual property, whether 

or not meritorious, and what the outcome of any related litigation or challenge may be. 

Our success also depends upon the skills, knowledge and experience of our scientific and technical 

19 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
personnel,  our  consultants  and  advisors  as  well  as  our  licensors  and  contractors.  To  help  protect  our 
proprietary  know-how  and  our  inventions  for  which  patents  may  be  unobtainable  or  difficult  to  obtain,  we 
rely on trade secret protection and confidentiality agreements. To this end, we require all employees to enter 
into  agreements  that  prohibit  the  disclosure  of  confidential  information  and,  where  applicable,  require 
disclosure  and  assignment  to  us  of  the  ideas,  developments,  discoveries  and  inventions  important  to  our 
business.  These  agreements  may  not  provide  adequate  protection  for  our  trade  secrets,  know-how  or  other 
proprietary  information  in  the  event  of  any  unauthorized  use  or  disclosure  or  the  lawful  development  by 
others  of  such  information.  If  any  of  our  trade  secrets,  know-how  or  other  proprietary  information  is 
disclosed,  the  value  of  our  trade  secrets,  know-how  and  other  proprietary  rights  would  be  significantly 
impaired and our business and competitive position would suffer. 

Due to legal and factual uncertainties regarding the scope and protection afforded by patents and 

other proprietary rights, we may not have meaningful protection from competition. 

 Our long-term success will substantially depend upon our ability to protect our proprietary 

technologies from infringement, misappropriation, discovery and duplication and avoid infringing the 
proprietary rights of others. Our patent rights and the patent rights of development stage biopharmaceutical 
companies in general, are highly uncertain and include complex legal and factual issues. These uncertainties 
also mean that any patents that we own or will obtain in the future could be subject to challenge, and even if 
not challenged, may not provide us with meaningful protection from competition. Patents already issued to us 
or our pending applications may become subject to dispute, and any dispute could be resolved against us. 

In connection with the process of seeking patent protection for RX-5902 in Japan, we filed a patent 
application including claims covering RX-5902 with the Japanese Patent Office (JPO) for examination. The 
JPO initially agreed that the claims covering the compound for RX-5902 were allowable, but as a result of a 
mistake in the patent application filing as prepared and submitted by our Japanese patent attorneys and 
incomplete review by the JPO’s patent examiner, the JPO issued a decision to grant a patent with claims that 
did not include RX-5902.   We appealed this decision within the JPO to request withdrawal of the decision to 
grant so that the correct claims would be allowed, but the JPO refused to withdraw its decision. As a result, 
and in accordance with Japanese law and procedure for appealing patent application decisions, we have filed a 
lawsuit against the JPO in Tokyo District Court to cause the JPO to reverse its decision to grant the errant 
patent and to allow a patent that includes claims covering RX-5902.   The patent application at issue remains 
pending subject to the outcome of this action. There can be no guarantee that we will be successful in winning 
the appeal to correct the error in the patent registration which would exclude the compound for RX-5902. 

If we infringe the rights of third parties we could be prevented from selling products and be forced to pay 
damages and defend against litigation. 

If  our  products,  methods,  processes  and  other  technologies  infringe  the  proprietary  rights  of  other 

parties, we could incur substantial costs and may have to:     

· 

· 

· 

· 

· 

obtain licenses, which may not be available on commercially reasonable terms, if at all; 

redesign our products or processes to avoid infringement; 

stop using the subject matter claimed in the patents held by others, which could cause us to 
lose the use of one or more of our drug candidates; 

pay damages; or 

defend litigation or administrative proceedings which may be costly whether we win or lose, 
and which could result in a substantial diversion of our management resources. 

Although to date, we have not received any claims of infringement by any third parties, as our drug 
candidates move into clinical trials and commercialization, our public profile and that of our drug candidates 

20 

 
 
 
 
 
 
 
 
 
 
 
 
 
may be raised and generate such claims. 

Our license agreement with Revaax may be terminated in the event we commit a material breach, the result 
of which would significantly harm our business prospects. 

Our license agreement with Revaax is subject to termination by Revaax if we materially breach our 
obligations under the agreement, including breaches with respect to certain installment payments and royalty 
payments, if such breaches are not cured within a 60-day period. The agreement also provides that it may be 
terminated if we become involved in a bankruptcy, insolvency or similar proceeding. If this license agreement 
is terminated, we will lose all of our rights to develop and commercialize the licensed compounds, including 
Serdaxin and Zoraxel.   

If we are unable to successfully manage our growth, our business may be harmed. 

In  addition  to  our  own  internally  developed  drug  candidates,  we  proactively  seek  opportunities  to 
license-in the compounds in oncology and other therapeutic areas that are strategic and have value creating 
potential  to  take  advantage  of  our  development  know-how.  We  are  actively  pursuing  additional  drug 
candidates  to  acquire  for  development.  Such  additional  drug  candidates  could  significantly  increase  our 
capital  requirements  and  place  further  strain  on  the  time  of  our  existing  personnel,  which  may  delay  or 
otherwise  adversely  affect  the  development  of  our  existing  drug  candidates.  Alternatively,  we  may  be 
required to hire more employees, further increasing the size of our organization and related expenses. If we 
are unable to manage our growth effectively, we may not efficiently use our resources, which may delay the 
development of our drug candidates and negatively impact our business, results of operations and financial 
condition. 

We  may  not  be  able  to  attract  and  retain  qualified  personnel  necessary  for  the  development  and 
commercialization of our drug candidates. Our success may be negatively impacted if key personnel leave. 

Attracting  and  retaining  qualified  personnel  will  be  critical  to  our  future  success.  We  compete  for 
qualified  individuals  with  numerous  biopharmaceutical  companies,  universities  and  other  research 
institutions. Competition for such individuals is intense, and we cannot assure you that we will be successful. 

The  loss  of  the  technical  knowledge  and  management  and  industry  expertise  of  any  of  our  key 
personnel,  especially  Dr.  Chang  H.  Ahn,  our  Chairman  and  Chief  Science  Officer,  and  regulatory  expert, 
could result in delays in product development and diversion of management resources, which could adversely 
affect  our  operating  results.  Dr.  Ahn  stepped  down  as  Chief  Executive  Officer  in  February,  2013  but  will 
remain  with  the  Company  as  our  Chief  Scientist  and  Chairman,  and  we  appointed  Peter  D.  Suzdak  as  our 
Chief Executive Officer. We do not have “key person” life insurance policies for any of our officers. 

We  may  incur  substantial  liabilities  and  may  be  required  to  limit  commercialization  of  our  products  in 
response to product liability lawsuits.     

The testing and marketing of medical products entail an inherent risk of product liability. If we cannot 
successfully  defend  ourselves  against  product  liability  claims,  we  may  incur  substantial  liabilities  or  be 
required  to  limit  commercialization  of  our  products.  Our  inability  to  obtain  sufficient  product  liability 
insurance at an acceptable cost to protect against potential product liability claims could prevent or inhibit the 
commercialization  of  pharmaceutical  products  we  develop,  alone  or  with  collaborators.  Although  we 
currently  carry  clinical  trial  insurance  and  product  liability  insurance  we,  or  any  collaborators,  may  not  be 
able  to  maintain  such  insurance  at  a  reasonable  cost.  Even  if  our  agreements  with  any  future  collaborators 
entitles  us  to indemnification  against  losses,  such indemnification  may  not  be  available  or adequate  should 
any claim arise. 

An investment in shares of our common stock is very speculative and involves a very high degree of risk. 

To date, we have generated no revenues from product sales and only minimal revenues from interest 

21 

 
 
 
 
 
 
 
 
 
 
 
 
 
on bank account balances and short-term investments. Our accumulated deficit as of December 31, 2012 and 
2011 was $63,311,283 and $57,084,613, respectively. For the years ended December 31, 2012, and 2011, we 
had net losses of $6,226,670 and $11,344,950, respectively, partially as a result of expenses incurred through 
a combination of research and development activities related to the various technologies under our control and 
expenses supporting those activities. Until we receive approval from the FDA and other regulatory authorities 
for our drug candidates, we cannot sell our drugs and will not have product revenues. 

The market price of our common stock may fluctuate significantly. 

The  market  price  of  our  common  stock  may  fluctuate  significantly  in  response  to  factors,  some  of 

which are beyond our control, such as: 

· 

· 

· 

· 

· 

· 

the announcement of new products or product enhancements by us or our competitors; 

changes in our relationships with our licensors or other strategic partners; 

developments concerning intellectual property rights and regulatory approvals; 

variations in our and our competitors’ results of operations; 

changes in earnings estimates or recommendations by securities analysts; and 

developments in the biotechnology industry. 

Further, the stock market, in general, and the market for biotechnology companies, in particular, have 
experienced  extreme  price  and  volume  fluctuations.  Continued  market  fluctuations  could  result  in  extreme 
volatility in the price of our common stock, which could cause a decline in the value of our common stock. 
You should also be aware that price volatility might be worse if the trading volume of our common stock is 
low. We have not declared or paid, and do not expect to declare or pay, any cash dividends on our common 
stock  because  we  anticipate  that  any  earnings  generated  from  future operations will be  used  to  finance  our 
operations and as a result, you will not realize any income from an investment in our common stock until and 
unless you sell your shares at a profit. 

Some  or  all  of  the  “restricted”  shares  of  our  common  stock  issued  in  the  merger  of  CPRD  and 
Rexahn, Corp or held by other stockholders may be offered from time to time in the open market pursuant to 
Rule 144, and these sales may have a depressive effect on the market for our common stock. In general, an 
affiliated person who has held restricted shares for a period of six months may, upon filing with the SEC a 
notification  on  Form  144,  sell  into  the  market  common  stock  in  an  amount  equal  to  1  percent  of  the 
outstanding  shares  (approximately  1,200,000  shares)  during  a  three-month  period.  Non-affiliates  may  sell 
restricted securities after six months without any limits on volume. 

Our  common  stock  is  currently  listed  on  the  NYSE  AMEX  under  the  trading  symbol  “RNN.”  However, 
because our common stock may be a “penny stock,” it may be more difficult for you to sell shares of our 
common stock, and the market price of our common stock may be adversely affected. 

Our common stock may be a “penny stock” if, among other things, the stock price is below $5.00 per 
share,  we  are  not  listed  on  a  national  securities  exchange  or  approved  for  quotation  on  the  Nasdaq  Stock 
Market, or we have not met certain net tangible asset or average revenue requirements. Broker-dealers who 
sell  penny  stocks  must  provide  purchasers  of  these  stocks  with  a  standardized  risk-disclosure  document 
prepared  by  the  SEC.  This  document  provides  information  about  penny  stocks  and  the  nature  and  level  of 
risks  involved  in  investing  in  the  penny-stock  market.  A  broker  must  also  give  a  purchaser,  orally  or  in 
writing,  bid  and  offer  quotations  and  information  regarding  broker  and  salesperson  compensation,  make  a 
written  determination  that  transactions  in  penny  stock  are  suitable  for  the  purchaser,  and  obtain  the 
purchaser’s written agreement to the purchase. Broker-dealers must also provide customers that hold penny 
stock in their accounts with such broker-dealer a periodic statement containing price and market information 

22 

 
 
 
 
 
 
 
 
 
 
 
 
 
     
relating to the penny stock. If a penny stock is sold in violation of the penny stock rules, purchasers may be 
able  to  cancel  their  purchase  and  get  their  money  back.  If  applicable,  the  penny  stock  rules  may  make  it 
difficult  for  investors  to  sell  their  shares  of  our  stock.  Because  of  the  rules  and  restrictions  applicable  to  a 
penny stock, there is less trading in penny stocks and the market price of our common stock may be adversely 
affected. Also, many brokers choose not to participate in penny stock transactions. Accordingly, purchasers 
may not always be able to resell shares of our common stock publicly at times and prices that they feel are 
appropriate. 

We may require additional capital funding the receipt of which may impair the value of our common stock. 

If  we  expand  more  rapidly  than  currently  anticipated  or  if  our  working  capital  needs  exceed  our 
current expectations, we may need to raise additional capital through public or private equity offerings or debt 
financings.  Our  future  capital  requirements  depend  on  many  factors  including  our  research,  development, 
sales and marketing activities. We do not know whether additional financing will be available when needed, 
or will be available on terms favorable to us. If we cannot raise needed funds on acceptable terms, we may not 
be able to develop or enhance our products, take advantage of future opportunities or respond to competitive 
pressures or unanticipated requirements. To the extent we raise additional capital by issuing equity securities, 
our stockholders may experience substantial dilution and the new equity securities may have greater rights, 
preferences or privileges than our existing common stock. 

We have not paid dividends to our stockholders in the past, and we do not anticipate paying dividends to 
our stockholders in the foreseeable future. 

We have not declared or paid cash dividends on our common stock. We currently intend to retain all 
future  earnings,  if  any,  to  fund  the  operation  of  our  business,  and  therefore  we  do  not  anticipate  paying 
dividends on our common stock in the foreseeable future. 

Item 1B.    Unresolved Staff Comments. 

None 

Item 2.    Description of Property. 

We  lease  approximately  5,466  square  feet  of  office  space  at  15245  Shady  Grove  Road,  Rockville, 
Maryland  20850.    We  also  lease  approximately 1,100  square  feet  of  laboratory  space  at  20271  Goldenrod 
Lane  2086,  #2088,  Germantown,  Maryland  20876.   The  facility  is  equipped  with  the  requisite  laboratory 
services required to conduct our business and we believe that our existing facilities are adequate to meet our 
needs  for  the  foreseeable  future.   The  office  lease,  which  commenced  on  June  29,  2009,  is  for  a  five  year 
term.   The  laboratory  lease,  which  commenced  on July  1,  2009,  is for  one  year term  and  was renewed  for 
additional years commencing July 1, 2010, July 1, 2011 and July 1, 2012.   We do not own any real property.   

Item 3.    Legal Proceedings. 

None   

Item 4. Mine Safety Disclosures 

Not Applicable

23 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
PART II 

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

As of March 22, 2013, we are authorized to issue two classes of capital stock, which are common 
stock  and  preferred  stock.    Our  total  authorized  shares  of  common  stock  and  preferred  stock  are 
500,000,000 shares, par value $0.0001 per share, and 100,000,000 shares, par value $0.0001, respectively.   
As  of  March  22,  2013,  we  have  119,428,929  shares  of  common  stock  outstanding  and  approximately 
8500 stockholders of record of common stock.    As of March 22, 2013, no shares of preferred stock are 
outstanding. 

Our  common  stock  is  traded  on  the  NYSE  AMEX,  formerly  known  as  the  American  Stock 
Exchange,  under  the ticker  symbol  “RNN.”    From  May  16,  2005 to May  23, 2008  our common  stock 
was  traded  on  the  Over  the  Counter  Bulletin  Board  (the  OTC-BB)  under  the  ticker  symbol  “RXHN.”   
From November 2004 until May 13, 2005, our common stock was traded on the OTC-BB under the ticker 
symbol “CPRD.”     

The  following  table  sets  forth  the  high  and  low  sales  prices  of  our  common  shares  as  reported 

during the periods indicated.     

Period 

2011 

First Quarter 
Second Quarter   
Third Quarter 
Fourth Quarter 

2012 

First Quarter 
Second Quarter 
Third Quarter 
Fourth Quarter 

Dividends 

High 

Low 

1.84 
1.39 
1.27 
1.16 

0.64 
0.53 
0.75 
0.53 

1.07 
1.15 
0.91 
0.35 

0.39 
0.30 
0.35 
0.29 

We  have  not  paid  any  cash  dividends  on  common  stock  and  do  not  expect  to  do  so  in  the 
foreseeable  future.    We  anticipate  that  any  earnings  generated  from  future  operations  will  be  used  to 
finance our operations.    No restrictions exist upon our ability to pay dividends. 

Purchase of Equity Securities by the Issuer and Affiliated Purchasers 

There were no repurchases of equity securities in 2012. 

Sale of Unregistered Equity Securities 

On  January  19,  2011,  the  Company  completed  a  sale  of  2,334,515  shares  of  the  Company’s 
common  stock  to  Teva  for  an  aggregate  purchase  price  of  $3,950,000.    This  investment  by  Teva  was 

24 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
made  pursuant  to  the  Purchase  Agreement,  whereby  Teva  had  the  option  to  make  an  additional 
investment in the Company’s common stock for the purpose of supporting the research and development 
program  for  the  pre-clinical  stage,  anti-cancer  compound  RX-3117.    This  per  share  price  of  the 
Company’s  common  stock  purchased  by Teva  was  determined  pursuant to the Purchase  Agreement, as 
amended, which provided for a per share price of 120% above the closing price on January 5, 2011.    The 
securities were issued pursuant to the exemption from the registration requirements of the Securities Act 
of  1933,  as  amended,  afforded  by  Section  4(2)  thereof, as  a  transaction  to  an  accredited  investor  not 
involving a public offering. 

On  December  7,  2012  the  Company  completed  a  sale  of  2,083,333  shares  of  the  Company’s 
common stock to Teva for an aggregate purchase price of $750,000.    This investment by Teva was made 
pursuant  to  the  Purchase  Agreement,  as  amended,  whereby  Teva  had  the  option  to  make  an  additional 
third  investment  in  the  Company’s  common  stock  for  the  purpose  of  supporting  the  research  and 
development program for the pre-clinical stage, anti-cancer compound RX-3117.    This per share price of 
the Company’s common stock purchased by Teva was determined pursuant to the Purchase Agreement, 
as amended, which provided for a per share price of 120% above the closing price on December 6, 2012.   
The securities were issued pursuant to the exemption from the registration requirements of the Securities 
Act of 1933, as amended, afforded by Section 4(2) thereof, as a transaction to an accredited investor not 
involving a public offering.   

Equity Compensation Plan Information 

The following table provides information, as of December 31, 2012, about shares of our common 
stock  that  may  be  issued  upon  the  exercise  of  options,  warrants  and  rights  granted  to  employees, 
consultants or directors under all of our existing equity compensation plans. 

Number of 
securities to be 
issued upon 
exercise of 
outstanding 
options, warrants   
and rights 

Equity compensation plans 
approved by stockholders 
Equity compensation plans 
not approved by 
stockholders 

Total 

7,741,795 

– 
7,741,795 

Item 6.    Selected Financial Data. 

Weighted average 
exercise price of 
outstanding 
options, warrants 
and rights 

Number of securities 
remaining available 
for future issuance 
under equity 
compensation plans 

$1.03 

– 
$1.03 

8,578,000 

– 
8,578,000 

      A smaller reporting company is not required to provide information required by this Item. 

25 

 
 
   
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 7.    Management’s Discussion and Analysis of Financial Condition and Results of Operation. 

You  should  read the  following  discussion  and  analysis  of  our  results  of  operations, financial  condition 
and liquidity in conjunction with our financial statements and the related notes, which are included in this 
Annual Report on Form 10-K.    Some of the information contained in this discussion and analysis or set 
forth elsewhere in this Annual Report on Form 10-K, including information with respect to our plans and 
strategies  for  our  business,  statements  regarding  the  industry  outlook,  our  expectations  regarding  the 
future  performance  of  our  business,  and  the  other  non-historical  statements  contained  herein  are 
forward-looking  statements.    See  “Cautionary  Statement Regarding  Forward-Looking  Statements.”   
You  should  also  review  the  “Risk  Factors”  section  under  this  Item  1A  of  this  Annual  Report  for  a 
discussion  of  important  factors  that  could  cause  actual  results  to  differ  materially  from  the  results 
described herein or implied by such forward-looking statements. 

Overview 

Our  company  resulted  from  the  merger  of  Corporate  Road  Show.Com  Inc.,  a  New  York 
corporation  incorporated  in  November 1999,  (“CPRD”),  and  Rexahn,  Corp,  a  Maryland  corporation, 
immediately after giving effect to our reincorporation as a Delaware corporation under the name “Rexahn 
Pharmaceuticals, Inc.”    In connection with that transaction, a wholly owned subsidiary of ours merged 
with  and  into  Rexahn,  Corp,  with  Rexahn,  Corp  remaining  as  the  surviving  corporation  and  a  wholly 
owned  subsidiary  of  ours.    In  exchange  for  their  shares  of  capital  stock  in  Rexahn,  Corp,  the  former 
stockholders of Rexahn, Corp received shares of common stock representing approximately 91.8% of the 
Company’s outstanding equity after giving effect to the transaction.    Further, upon the effective time of 
the  Merger,  our  historic  business  was  abandoned  and  the  business  plan  of  Rexahn,  Corp  was  adopted.   
The transaction was therefore accounted for as a reverse acquisition with Rexahn, Corp as the accounting 
acquiring  party  and  CPRD  as  the  acquired  party.    In  September 2005,  Rexahn, Corp  was  merged  with 
and into the Company. 

Our  efforts  and  resources  have  been  focused  primarily  on  acquiring  and  developing  our 
pharmaceutical  technologies,  raising  capital  and  recruiting  personnel.    We  are  a  development  stage 
company  and  have  no  product sales to  date  and  we will  not  receive  any  product  sales  until  we receive 
approval  from  the  FDA  or  equivalent  foreign  regulatory  bodies  to  begin  selling  our  pharmaceutical 
candidates.    Our major sources of working capital have been proceeds from various private financings, 
primarily  private  sales  of  common  stock  and  debt  securities,  and  collaboration  agreements  with  our 
strategic investors. 

Critical Accounting Policies 

A  “critical  accounting  policy”  is  one  which  is  both  important  to  the  portrayal  of  our  financial 
condition  and  results  and  requires  our  management’s  most  difficult,  subjective  or  complex  judgments, 
often as a result of the need to make estimates about the effect of matters that are inherently uncertain.   
Our accounting policies are in accordance with United States generally accepted accounting principles, or 
GAAP,  and  their  basis  of  application  is  consistent  with  that  of  the  previous  year.    Our  significant 
estimates  include  assumptions  made  in  estimating  the  fair  values  of  stock-based  compensation  and  our 
assessment relating to the impairment of intangible assets and deferred revenues.     

Research and Development 

Research and development costs are expensed as incurred.    Research and development expenses 
consist  primarily  of  third  party  service  costs  under  research  and  development  agreements,  salaries  and 
related  personnel  costs,  as  well  as  stock  compensation  related  to  these  costs,  costs  to  acquire 

26 

 
 
 
 
 
 
 
pharmaceutical  products  and  product  rights  for  development  and  amounts  paid  to  contract  research 
organizations, hospitals and laboratories for the provision of services and materials for drug development 
and clinical trials. 

Costs incurred in obtaining the license rights to technology in the research and development stage 

that have no alternative future uses and are for unapproved product compounds are expensed as incurred. 

Fair Value of Financial Instruments 

The  carrying  amounts  reported  in  the  accompanying  financial  statements  for  cash  and  cash 
equivalents,  prepaid  expenses  and  other  current  assets  and  accounts  payable  and  accrued  expenses 
approximate fair value because of the short-term maturity of these financial instruments.    The fair value 
methodology  for  our  warrant  liabilities,  put  feature  on  common  stock,  and  marketable  securities  is 
described in detail in Item 8 of this Form 10-K. 

Income Taxes 

The Company accounts for income taxes in accordance with Accounting Standards Codification 
(“ASC”)  740,  “Income  Taxes.”  (“ASC  740”)    Deferred  tax  assets  and  liabilities  are  recorded  for 
differences  between  the  financial  statement  and  tax  basis  of  the  assets  and  liabilities  that  will  result  in 
taxable or deductible amounts in the future based on enacted tax laws and rates.    ASC 740 requires that a 
valuation allowance be established when it is more likely than not that all portions of a deferred tax asset 
will not be realized.    A review of all positive and negative evidence needs to be considered, including a 
company’s current and past performance, the market environment in which the company operates, length 
of  carryback  and  carryforward  periods and existing  contracts that  will  result in  future  profits.    Income 
tax expense is recorded for the amount of income tax payable or refundable for the period, increased or 
decreased by the change in deferred tax assets and liabilities during the period. 

As a result of the Company’s significant cumulative losses, we determined that it was appropriate 

to establish a valuation allowance for the full amount of our deferred tax assets. 

The  calculation  of  our  tax  liabilities  involves  the  inherent  uncertainty  associated  with  the 
application  of  complex  tax  laws.    We  are  subject  to  examination  by  various  taxing  authorities.    We 
believe that as a result of our losses sustained to date, any examination would result in a reduction of our 
net operating loss carryforward rather than a tax liability.    As such, we have not provided for additional 
taxes estimated under ASC 740.   

Warrant Liabilities 

In  accordance  with  ASC  480,  “Distinguishing  Liabilities  from  Equity,”  we  record  warrant 
liabilities at fair value due to provisions in our warrant agreements, as discussed in Footnote 12 of Item 8 
of this Form 10-K.    We reevaluate the fair value of our warrants at each reporting period, and changes in 
the fair value between reporting periods is recorded as “unrealized gain on fair value of warrants” in the 
statement of operations.     

Put Feature on Common Stock 

We  extended  anti-dilution  protection  provisions  on  our  common  stock  to  our  investors  in  our 
December 2007 and March 2008 financings, whereby in the event that we sell or issue shares below the 
effective purchase price paid, the investors would thereupon receive additional shares in a ratio outlined 
in the Securities Purchase Agreement.    In accordance with ASC 480, this feature is a written put on our 
common stock, and is classified as a liability at fair value.    We reevaluate the fair value at each reporting 
period, and changes in the fair value are recorded as unrealized gain on put feature on common stock in 
the statement of operations.    The anti-dilution provisions expired in December, 2009 and March, 2010. 

27 

 
 
 
Stock-Based Compensation 

In accordance with ASC 718, “Stock Compensation” compensation costs related to share-based 
payment transactions, including employee stock options, are to be recognized in the financial statements. In 
addition, the Company adheres to the guidance set forth within SEC Staff Accounting Bulletin No. 107 
(“SAB 107”), which provides the Staff’s views regarding the interaction between ASC 718 and certain SEC 
rules and regulations, and provides interpretations with respect to the valuation of share-based payments for 
public companies.   

Impairment of Long-Lived Assets 

In accordance with ASC 360, “Property, Plant and Equipment,” long-lived assets to be held and 
used are analyzed for impairment whenever events or changes in circumstances indicate that the related 
carrying amounts may not be recoverable.    The Company evaluates at each balance sheet date whether 
events  and  circumstances  have  occurred  that  indicate  possible  impairment.    If  there  are  indications  of 
impairment, the Company uses future undiscounted cash flows of the related asset or asset grouping over 
the remaining life in measuring whether the assets are recoverable.    In the event such cash flows are not 
expected to be sufficient to recover the recorded asset values, the assets are written down to their estimated 
fair  value.    Management  determined  that  an  impairment  of  intangible  assets  occurred  in  2009  and 
wrote-off the assets remaining carrying value of $286,132.     

Concentration of Credit Risk 

ASC 825, “Financial Instruments,” requires disclosure of any significant off-balance sheet risk and 
credit  risk  concentration.    The  Company  does  not  have  significant  off-balance  sheet  risk  or  credit 
concentration.    The Company maintains cash and short-term investments with major financial institutions.   
From time to time the Company has funds on deposit with commercial banks that exceed federally insured 
limits.    The  balances  are  insured  by  the  Federal  Deposit  Insurance  Corporation  up  to  $250,000.  At 
December  31,  2012,  the  Company’s  uninsured  cash  balance  was  $13,805,740.  Management  does  not 
consider this to be a significant credit risk as the banks are large, established financial institutions. 

Recent Accounting Pronouncements Affecting the Company 

Fair Value Measurements 

In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards 
Update  2011-04  to  Accounting  Standards  Codification  (“ASC”)  820,  “Fair  Value  Measurements  and 
Disclosures” (“ASC 820”) which amends the disclosure requirements for fair value instruments.    The new 
disclosures required include disclosure regarding the sensitivity of the fair value measurement to changes in 
unobservable  inputs,  and  the  interrelationships  between  those  unobservable  inputs.    The  guidance  is 
effective for the Company for fiscal years and interim periods beginning on or after December 15, 2011.   
The Company adopted this guidance during the first quarter of 2012. 

Comprehensive Income 

In  June  2011,  the  FASB  issued  authoritative  guidance  for  presentation  and  disclosure  of 
comprehensive income in the financial statements.    Under the new guidance, a company may no longer 
present the components of other comprehensive income as part of the statement of changes in the Statement 
of Stockholder’s Equity, and instead must present the components of comprehensive income either in the 
Statement of Operations or in a separate statement immediately following the Statement of Operations.    In 
addition, reclassification adjustments between comprehensive income and net income must be disclosed on 
the financial statements.    This guidance is effective for the Company for fiscal years and interim periods 

28 

 
 
 
 
 
 
beginning on or after December 15, 2011.        The Company adopted this guidance during the first quarter 
of 2012. 

In February, 2013 the FASB issued Accounting Standards Update 2013-02, “Comprehensive 

Income: Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” to 
improve the transparency of reporting reclassifications from comprehensive income to net income.    The 
new amendments require that a company must present the effects on line items of net income of 
significant amounts reclassified out of accumulated other comprehensive income, and additional 
referencing and disclosure regarding these items.    The guidance is effective for the Company for fiscal 
years and interim periods beginning on or after December 15, 2012.    Management believes that the 
adoption of this guidance will not have a material impact on the financial statements. 

Results of Operations 

Comparison of the Year Ended December 31, 2012 and the Year Ended December 31, 2011 

Total Revenues 

The Company had no revenues for the years ended December 31, 2012 or 2011. 

General and Administrative Expenses 

General  and  administrative  expenses  consist  primarily  of  salaries  and  related  expenses  for 
executive, finance and other administrative personnel, recruitment expenses, professional fees and other 
corporate expenses, including business development, investor relations, and general legal activities. 

General  and administrative  expenses  decreased  $834,680,  or  23.5%, to  $2,713,149  for the  year 
ended  December  31,  2012  from  $3,547,829  for  the  year  ended  December  31,  2011.    The  decrease  is 
primarily  attributed  to  stock  option  compensation.    There  were  a  large  number  of  options  that  fully 
vested in 2011, which resulted in expense in 2011 but not in 2012.    During the year ended December 31, 
2012  we  reduced  investor  relations  activities  by  consolidating  our  investor  relations  activities  to  one 
provider.  In  addition,  the  year  ended  December  31,  2011  had  greater  professional  fees  related  to  the 
restatement of our financial statements due to reclassifying our warrants and put feature on common stock 
from equity to liabilities for the year ended December 31, 2009. 

Research and Development Expenses 

Research and development expenses consist primarily of salaries and related personnel costs, fees 
paid to consultants and outside service providers for laboratory development and other expenses relating 
to the design, development, testing, and enhancement of our drug candidates.    We expense our research 
and development costs as they are incurred. 

Research and development expenses decreased $8,599,191 or 71.7%, to $3,392,896 for the year 
ended December 31, 2012, from $11,992,087 for the year ended December 31, 2011.    The decrease is 
primarily due to the costs associated with the Serdaxin Phase IIb trial, where we incurred approximately 
$7,430,000 for the year ended December 31, 2011.    In addition, we incurred less costs for RX-3117 in 
2012 compared to 2011 due to drug manufacturing costs in 2011 that were used for the exploratory Phase 
I clinical trial.     

29 

 
 
 
 
 
 
 
 
 
 
 
 
 
Patent Fees 

Our  patent  fees  decreased  $114,928,  or  21.0%,  to  $431,099  for  the  year  ended  December  31, 
2012, from $546,027 for the year ended December 31, 2011.    The decrease was primarily due to legal 
costs to respond to the office actions on pending patent applications, and translation fees associated with 
regionalizing patents in foreign jurisdictions for the year ended December 31, 2011, but did not occur in 
2012. 

Depreciation and Amortization 

Depreciation and amortization expense decreased $2,684, or 6.0% to $42,386 for the year ended 
December 31, 2012 from $45,070 for the year ended December 31, 2011.    The decrease is primarily due 
to fully depreciated assets for which we incurred depreciation in 2011 but not in 2012. 

Interest Income 

Interest income decreased $88,148, or 80.7% to $21,092 for the year ended December 31, 2012 
from $109,240 for the year ended December 31, 2011.    The decrease is due to a decrease in interest rates 
and  interest  bearing  investments  for  the  year  ended  December  31,  2012  compared  to  the  year  ended 
December 31, 2011. 

Unrealized Gain on Fair Value of Warrants 

Our warrants are recorded as liabilities at fair value, and the warrants are valued using a lattice 
model.    Changes in the fair value of warrants are recorded as an unrealized gain or loss in our Statement 
of Operations.    During the year ended December 31, 2012 and 2011, we recorded an unrealized gain on 
the fair value of our warrants of $663,876 and $4,778,450.    The change in the fair value of our warrants 
is a non-cash item reflected in our financial statements. 

Net Loss 

As a result of the above, net loss for the year ended December 31, 2012 was $6,226,670, or $0.06 
per share, compared to a net loss of $11,344,950, or $0.12 per share, for the year ended December 31, 
2011. 

30 

 
 
 
 
 
 
 
 
 
 
 
Research and Development Projects 

Research  and  development  expenses  are  expensed  as  incurred.  Research  and  development 
expenses  consist  primarily  of  salaries  and  related  personnel  costs,  costs  to  acquire  pharmaceutical 
products  and  product  rights  for  development  and  amounts  paid  to  contract  research  organizations, 
hospitals and laboratories for the provision of services and materials for drug development and clinical 
trials.  Costs incurred in obtaining the license rights to technology in the research and development stage 
and have no alternative future uses are expensed as incurred.  Our research and development programs are 
related  to  our  oncology  clinical  stage  drug  candidates,  Archexin,  RX-3117  and  RX-5902,  our  CNS 
candidates Serdaxin and Zoraxel and pre-clinical stage drug candidates, RX-0047-Nano, RX-0201-Nano, 
and RX-21101.  Each of our drug candidates is in various stages of completion as described below.  As 
we  expand  our  clinical  studies,  we  will  enter  into  additional  development  agreements.  Significant 
additional  expenditures  will  be  required  if  we  complete  our  clinical  trials,  start  new  trials,  apply  for 
regulatory  approvals,  continue  development  of  our  technologies,  expand  our  operations  and  bring  our 
products to market.  The eventual total cost of each clinical trial is dependent on a number of uncertainties 
such as trial design, the length of the trial, the number of clinical sites and the number of patients.  The 
process  of  obtaining  and  maintaining  regulatory  approvals  for  new  therapeutic  products  is  lengthy, 
expensive  and  uncertain.  Because  the  successful  development  of  our  most  advanced  drug  candidates, 
Archexin,  RX-3117,  RX-5902,  Serdaxin  and  Zoraxel,  is  uncertain,  and  because,  RX-0047-Nano, 
RX-0201-Nano,  and  RX-21101  are  in  early-stage  development,  we  are  unable  to  estimate  the  costs  of 
completing our research and development programs, the timing of bringing such programs to market and, 
therefore, when material cash inflows could commence from the sale of these drug candidates.  If these 
projects  are  not  completed  as  planned,  our  results  of  operations  and  financial  condition  could  be 
negatively affected.   

The  table  below  summarizes  the  amounts  spent  on  each  of  our  research  and  development  projects 
through December 31, 2012: 

2012 

2011 

Cumulative from 
March 19, 2001 
(Inception) 
to December 31, 
2012 

Clinical Candidates 
Archexin 
RX-3117 
RX-5902 
Serdaxin 
Zoraxel 

  $            165,000   
            1,065,000 
626,000 
            150,000   
                  10,000   

  $          230,000   
1,397,500 
510,000 
            7,430,000   
              205,000   

  $        6,635,000   
              4,262,500   
1,199,000   
9,820,000 
            1,255,000   

Preclinical Compounds: 

          295,000 

680,000 

2,412,000 

Total 

$          2,311,000 

$      10,452,500 

$      25,583,500 

31 

 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Archexin®   

Archexin  is  a  20  nucleotide  single  stranded  DNA  anti-sense  molecule,  which  is  a  first-in-class 
inhibitor  of  the  protein  kinase  Akt.  Akt  plays  critical  roles  in  cancer  cell  proliferation,  survival, 
angiogenesis, metastasis, and drug resistance.  Archexin received "orphan drug" designation from the U.S. 
Food  and  Drug  Administration,  or  FDA,  for  five  cancer  indications  (renal  cell  carcinoma,  or  RCC, 
glioblastoma,  ovarian  cancer,  stomach  cancer  and  pancreatic  cancer).  The  FDA  orphan  drug  program 
provides seven years of marketing exclusivity after approval and tax incentives for clinical research. In 
August, 2012, we announced top line results of our Phase IIa clinical trial.    The open label 2-stage study 
was designed to assess the safety and efficacy of Archexin in combination with gemcitabine.    Stage 1 was 
the dose finding portion and Stage 2 was the dose expansion portion using the dose identified in Stage 1 to 
be administered with gemcitabine.    The study enrolled 31 subjects aged 18-65 with metastatic pancreatic 
cancer at nine centers in the United States and India.    The primary endpoint was overall survival following 
four cycles of therapy with a six month follow-up.    For those evaluable patients, the study demonstrated 
that  treatment  with  Archexin  in  combination  with  gemcitabine  provided  a  median  survival  rate  of  9.1 
months  compared  to  the  historical  survival  data  of  5.65  months  for  standard  single  agent  gemcitabine 
therapy.      The  most  frequent  reported  adverse  events  were  constipation,  nausea,  abdominal  pain  and 
pyrexia,  regardless  of  relatedness.    Rexahn  is  evaluating  options  for  advancing  Archexin,  including 
initiating Phase IIa clinical trials for chemo-resistant solid tumors and hematological malignancies in the 
second half of 2013...    We own one issued U.S. patent for Archexin. 

As  of  December  31,  2012,  we  have  spent  approximately  $6,635,000  for  the  development  of 
Archexin.    The  trial  was  completed  in  the  third  quarter  of  2012,  and  we  estimate  that  we  have 
approximately  an  additional  $110,000  of  costs  yet to be  billed  by  vendors for this  trial.    We  currently 
estimate that additional Phase II trials for Archexin will cost approximately $2,900,000. 

RX-3117 

  In 2009, we closed on the RELO and a Purchase Agreement with Teva for the development of 
our  novel  anti-cancer  compound,  RX-3117.    RX-3117  is  a  small  molecule,  new  chemical  entity 
nucleoside compound that has an anti-metabolite mechanism of action, and has therapeutic potential in a 
broad  range  of  cancers  including  colon,  lung,  and  pancreatic  cancer.    The  investment  by  TEVA  is 
restricted  to  supporting  the  research  and  development  program  for  the  development  of  RX-3117.    We 
will be eligible to receive royalties on net sales of RX-3117 worldwide.  On January 19, 2011, we entered 
into a second amendment to the Purchase Agreement, whereby Teva purchased 2,334,515 shares of our 
common stock for $3.95 million.    This second amendment also provided for a possible third investment 
by Teva, in the amount of $750,000. This compound entered into an exploratory Phase  I clinical study 
during the first quarter of 2012.    The primary objective of the study was to determine oral bioavailability 
of RX-3117 in humans.    On August 6, 2012, we released the results that the study demonstrated the oral 
bioavailability of RX-3117 in humans, and with no adverse events reported in the study. On December 7, 
2012,  Teva  exercised  the  third  investment  option,  which  constituted  the  final  closing  of  the  Purchase 
Agreement,  and  we  issued  2,083,333  shares  for  $750,000.    On  December  27,  2012  we  received 
$926,000  from  Teva  pursuant  to  a  second  amendment  to  the  RELO  for  the  further  development  of 
RX-3117.    The  costs  of  the  exploratory  Phase  I  clinical  study  were  approximately  $550,000.  As  of 
December 31, 2012, we have incurred approximately $4,262,500 for the development of RX-3117.    We 
anticipate that RX-3117 will enter a Phase I clinical trial in the second half of 2013.     

32 

 
 
 
 
 
 
 
RX-5902 

RX-5902 is a first-in-class small molecule that inhibits the phosphorylated p68 RNA helicase, a 
protein that plays a key role in cancer growth, progression, and metastasis.    In July, 2012, we submitted 
an  IND  Application  to  the  FDA  for  RX-5902.    As  of  December  31,  2012,  we  have  incurred 
approximately $1,199,000 for the development of RX-5902.    RX-5902 may enter Phase I clinical trials 
during  the  first  half  of  2013.    We  estimate  the  costs of  the  Phase  I  clinical  study  to  be  approximately 
$1,800,000. 

Serdaxin® (RX-10100)   

Serdaxin is an extended release formulation of clavulanic acid, which is an ingredient present in 
antibiotics  approved  by  the  FDA.    We  developed  Serdaxin  for  the  treatment  of  depression  and 
neurodegenerative  disorders.    From  January  to  September,  2011,  we  conducted  a  randomized, 
double-blind, placebo-controlled study that compared two doses of Serdaxin, 0.5 mg and 5 mg, to placebo 
over an 8-week treatment period for MDD patients.    On November 4, 2011, we released results that the 
study  showed  Serdaxin  did  not  demonstrate  efficacy  compared  to  a  placebo  group  as  measured  by  the 
MADRS.    All  groups  showed  an  approximate  14  point  improvement  in  the  protocol  defined  primary 
endpoint of MADRS, and had a substantial number of patients who demonstrated a meaningful clinical 
improvement  from  baseline.    The  study  showed  that  Serdaxin  was  safe  and  well  tolerated.    At  this 
point, we are currently not allocating resources to further develop Serdaxin to treat MDD and are looking 
for partners who will fund the clinical development. 

Through  December  31,  2012,  the  pre-clinical  and  clinical  costs  incurred  for  development  of 
Serdaxin  to  date  have  been  approximately  $9,820,000.    We  do  not  anticipate  additional  costs  for 
Serdaxin. 

Zoraxel™ (RX-10100)   

Zoraxel is an immediate release formulation of clavulanic acid, the same active ingredient found 
in our product candidate Serdaxin. The Phase IIa proof of concept, completed with encouraging results, 
was a randomized, double blind, placebo controlled and dose ranging (5 mg, 10 mg, 15 mg) study of 39 
erectile dysfunction patients (ages of 18 to 65) treated with Zoraxel. The Phase IIb study is designed to 
assess Zoraxel’s efficacy in approximately 150 male subjects, ages 18 to 70, with ED. The double blind, 
randomized,  placebo-controlled,  12-week  study  will  include  IIEF  as  the  primary  endpoint  following 
treatment  with  Zoraxel  at  25  and  50  mg  doses.    However,  given  the  results  of  the  Serdaxin  Phase  IIb 
MDD clinical trial and that Zoraxel and Serdaxin share a common ingredient, we are currently looking for 
partners who will fund the clinical development of Zoraxel. 

Through  December  31  2012,  the  costs  incurred  for  development  of  Zoraxel  to  date  have  been 
approximately  $1,255,000.  We  currently  estimate  that  these  Phase  IIb  studies  would  require 
approximately $2,300,000 but we have not allocated additional resources to the development of Zoraxel 
at this time. 

Pre-clinical Pipeline 

RX-0201-Nano,  RX-0047-Nano  and  RX-21101  are  all 

in  a  pre-clinical  stage  of 
development.    Through December 31, 2012, the costs incurred for development of these compounds to 
date  have  been  approximately  $2,412,000.   The  estimated  cost  to  complete  pre-clinical  toxicology  and 
Phase I clinical trials is estimated to be approximately $1,500,000 per each compound. 

33 

 
 
 
 
 
 
 
The conduct of the clinical trial and toxicology studies described above are being accomplished in 
conjunction with third-party clinical research organizations at external locations.  This business practice is 
typical for the pharmaceutical industry and companies like us.  As a result, the risk of completion or delay 
of  these  studies  is  not  within  our  direct  control  and  a  program  delay  may  occur  due  to  circumstances 
outside our control.  A delay in any of these programs  may not necessarily have a direct impact on our 
daily operations.  However, to the extent that a delay results in additional cost to us, unexpected expenses 
may result. 

We will need to raise additional money through debt and/or equity offerings in order to continue 
to develop our drug candidates.  If we are not able to raise sufficient additional money, we will have to 
reduce our research and development activities.  We will first reduce research and development activities 
associated with our preclinical compounds.  To the extent necessary, we will then reduce our research and 
development activities related to some or all of our clinical drugs. 

Liquidity and Capital Resources   

Operating Activities 

Cash used in operating activities was $6,619,559 for the year ended December 31, 2012.    The 
operating cash flows during the year ended December 31, 2012 reflect our net loss of $6,226,670 and a 
net decrease of cash components of working capital and non-cash charges totaling $392,889.    Cash used 
in operating activities was $15,530,306 for the year ended December 31, 2011. 

Cash  provided  by  investing  activities  was  $2,189,964  for  the  year  ended  December  31,  2012, 
consisted  of  $1,850,000  from  the  sale  of  marketable  securities,  and  a  decrease  in  restricted  cash  of 
$339,964. Cash used in investing activities for the year ended December 31, 2011 was $545,919.   

Cash  provided  by  financing  activities  of  $8,054,650  for  the  year  ended  December  31,  2012 
consisted  of  net  proceeds  of  $7,128,650  from  the  issuance  22,000,000  shares  of  common  stock  to 
investors,  and  2,083,333  shares  to  Teva.        The  investors  were  also  issued  warrants  to  purchase 
12,100,000  shares  of  common  stock.    Cash  provided  by  financing  activities  was  $13,597,474  for  the 
year ended December 31, 2011.   

Financings 

We  have  financed  our  operations  since  inception  primarily  through  equity  and convertible  debt 
financings and interest income from investments of cash and cash equivalents.    During fiscal year 2012, 
we  had  a  net  increase  in  cash  and  cash  equivalents  of  $3,625,055.    The  increase  resulted  from  cash 
provided by financing and investing activities of $8,054,650 and $2,189,964, respectively, offset by cash 
used in operating activities of $6,619,559.   

On March 31, 2011, the Company closed on a purchase agreement to issue 8,333,333 shares of 
common  stock  at  a  price  of  $1.50  per  share  to  an  institutional  investor  for  net  proceeds  of  $9,293,876 
which  includes  $706,124  of  cash  stock  issuance  costs.    The  investors  were  also  issued  warrants  to 
purchase 3,333,333 shares of common stock at a purchase price of $1.50 per share, exercisable on or after 
six  months  from  the  date  of  delivery  until  the  five-year  anniversary  of  the  date  the  warrants  are 
exercisable.    There warrants were valued at $2,826,666 and recorded as warrant liabilities.    The closing 
costs  included  208,333  warrants,  valued  at  $97,667,  and  $706,124  of  underwriter’s  discounts  and 
professional and other fees. 

34 

 
 
 
 
 
 
 
 
 
 
 
 
On December 4, 2012 we closed on an underwritten public offering to issue and sell 19,130,435 
shares  of  common  stock  and  warrants  to  purchase  up  to  10,521,739  shares  of  common  stock.    The 
common  stock  and  warrants  were sold in  units, consisting  of  common  stock  and  a  warrant  to  purchase 
0.55 shares of common stock, at a price of $0.33 per share. The warrants have an exercise price of $0.472 
per whole share of common stock.    Pursuant to the underwriting agreement, we granted the Underwriters 
a  45-day  option  to  purchase  an  additional 2,869,565 shares  of common  stock  and  warrants  to  purchase 
1,578,261  shares  of  common  stock.    On  December  4,  2012,  the  underwriters  partially  exercised  this 
option,  to  purchase  an  additional  869,565  units,  consisting  of  869,565  shares  of  common  stock  and 
warrants  to  purchase  478,261  shares  of  common  stock.    On  December  10,  2012,  the  underwriters 
exercised  the  remaining  overallotment  option  to  purchase  an  additional  2,000,000  units,  consisting  of 
2,000,000  shares  of  common  stock  and  warrants to  purchase 1,100,000  shares  of  common  stock.    The 
total gross proceeds of this offering was $7,260,000.    The warrants issued are exercisable on the closing 
date until the five-year anniversary of the closing date, and were recorded as liabilities at fair value.    The 
closing costs of $977,434 included warrants to purchase 880,000 shares of common stock issued to the 
underwriters  valued  at  $163,096,  and  $814,338  for  underwriter’s  discounts,  and  professional  and  other 
fees.     

For the next 12 months, we will have to fund all of our operations and capital expenditures from 

the  net  proceeds  of  equity  and  debt  offerings  we  may  make,  cash  on  hand,  licensing  fees  and  grants.   
Although we expect to have to pursue additional financing, there can be no assurance that we will be able 
to secure financing when needed or obtain such financing on terms satisfactory to us, if at all, or that any 
additional funding we do obtain will be sufficient to meet our needs in the long term.    If we are not able 
to raise sufficient additional money, we will have to reduce our research and development activities.     

Contractual Obligations     

We  have  contracted  with  various  vendors  to  provide  research  and  development  services.  The 
terms  of  these  agreements  usually  require  an  initiation  fee  and  monthly  or  periodic  payments  over  the 
term of the agreement, ranging from 2 months to 36 months. The costs to be incurred are estimated and 
are  subject  to  revision.  As  of  December  31,  2012,  the  total  contract  value  of  these  agreements  was 
approximately  $19,705,682  and  we  made  payments  totaling  $17,875,371  under  the  terms  of  the 
agreements.    All  of  these  agreements  may  be  terminated  by  either  party  upon  appropriate  notice  as 
stipulated in the respective agreements. 

On September 9, 2010, we and three of our key executives entered into Amended and Restated 
Employment  Agreements.    The  Amended  and  Restated  Employment  Agreements  replace  the  prior 
employment  contracts  entered  into  on  August  10,  2009.   We  entered  into  the  Amended  and  Restated 
Employment Agreements in order to provide the key executives with: (i) an automatic one year renewal 
upon  the  expiration  of  the  initial  three  year  term  and  upon  each  consecutive  year  term  unless  such 
employment  with  the  Company  is  terminated  earlier  by  the  Company  or  the  executives;  (ii)  an  annual 
base salary adjustment for inflation as determined by the Consumer Price Index subject to review by the 
Company’s Compensation Committee; (iii) an increase in the Company provided life insurance coverage 
from an amount equal to two times the executive’s annual base salary to an amount equal to four times 
the executive’s annual base salary; and (iv) a one-time cash payment, subject to applicable withholding 
requirements  under  applicable  state  and  federal  law,  in  an  amount  equal  to  the  executive’s  increased 
income  tax  costs  as  a  result  of  payments  made  to  the  executive  by  the  Company  under  the  change  of 
control provisions of the Amended and Restated Employment Agreement. Other than these changes, the 
new  contracts  have  substantially  similar  terms  to  the  executives’  prior  employment  agreements.    The 
agreements result in annual commitments of $350,000, $250,000 and $200,000, respectively. 

35 

 
 
 
 
 
 
 
On  June  22,  2009,  we  entered  into  a  License  Agreement  with  Korea  Research  Institute  of 
Chemical  Technology  (KRICT)  to  acquire  the  rights  to  all  intellectual  properties  related  to 
Quinoxaline-Piperazine derivatives that were synthesized under a Joint Research Agreement.    The initial 
license fee was $100,000, all of which was paid as of December 31, 2009.    The agreement with KRICT 
calls  for  a  one-time  milestone  payment  of  $1,000,000  within  30  days  after  the  first  achievement  of 
marketing  approval  of  the  first  commercial  product  arising  out  of  or  in  connection  with  the  use  of 
KRICT’s intellectual properties.    As of December 31, 2012, this milestone has not occurred. 

On June 29, 2009, we signed a five year lease for 5,466 square feet of office space in Rockville, 
Maryland  commencing  on  June  29,  2009.    The  lease  requires  annual  base  rents  of  $76,524  with 
increases  over  the  next  five  years.  Under  the  leasing  agreement,  we  pay  our  allocable  portion  of  real 
estate taxes and common area operating charges.    We paid $158,835 and $148,593, for rent under this 
lease in the years ended December 31, 2012 and 2011, respectively. 

    Future rental payments over the next five years and thereafter are as follows: 

2013 
2014 

$162,806 
82,408 
$245,214 

In connection with the lease agreement, we issued a letter of credit of $100,000 in favor of the 
lessor.    We have restricted cash equivalents of the same amount for the letter of credit.    On August 2, 
2010 and July 1, 2011, the letter of credit was reduced to $50,000, and $37,500 respectively, per the lease 
agreement. 

On September 21, 2009, the Company closed on the Purchase Agreement with Teva, under which 
Teva  purchased  3,102,837  shares  of  our  common  stock  for  $3.5  million.  Contemporaneous  with  the 
execution and delivery of this agreement, the parties executed a research and the RELO pursuant to which 
the Company agreed to use $2,000,000 from the gross proceeds of the issuance and sale of shares to Teva 
to fund a research and development program for the pre-clinical development of RX-3117.    On January 
19,  2011,  the  Company  entered  into  a  second  amendment  to  the  Purchase  Agreement  in  which  Teva 
purchased  2,334,515  shares  of  the  common  stock  of  the  Company  for  gross  proceeds  of  $3,950,000, 
which the Company agreed to use for the further preclinical development of RX-3117.    On December 7, 
2012, Teva exercised its option to purchase $750,000 of common stock, and we issued Teva 2,083,333 
shares.    This constituted the third and final closing agreed to in the Purchase Agreement, and the use of 
these funds is not restricted.    On December 27, 2012, we received funds from Teva in accordance with a 
second amendment to the RELO agreement, entered into on November 27, 2012 in which Teva provided 
us with an additional $926,000 of research funding for the development of RX-3117.    We did not issue 
equity for this transaction. 

36 

 
 
 
 
  
 
 
 
 
 
 
 
 
 
The table below summarizes the investments made under the Purchase Agreement and RELO: 

Date of 
Investment 

Investment 
Amount 

Shares Issued 

Proceeds 
Remaining in 
Restricted Cash 
as of 12/31/12 

Deferred 
Research and 
Development 
Arrangement 
Balance at 
12/31/12 

9/21/2009 
1/19/2011 
12/7/2012 
12/27/2012 
Total 

$ 

$ 

3,500,000  
3,950,000  
750,000  
926,000  
9,126,000  

3,102,837 $ 
2,334,515  
2,083,333  
  -  
7,520,685 $ 

  - $ 
  178,301   
  -  
876,000  
1,054,301 $ 

  - 
  - 
  - 
  876,000  
876,000 

On May 30, 2012, and June 22, 2011, we signed a one year renewal to use lab space commencing 
on July 1, 2012 and 2011, respectively.    The lease requires monthly rental payments of $4,554.    Rent 
paid under the lease during the years ended December 31, 2012 and 2011 was $54,648. 

We  established  a  401(k)  plan  for  our  employees  where  we  match  100%  of  the  first  3%  of  the 
employee’s deferral plus 50% of an additional 2% of the employee’s deferral.    Expense related to this 
matching  contribution  aggregated  $65,686,  and  $66,162  for  the  years  ended  December  31,  2012  and 
2011, respectively. 

Current and Future Financing Needs 

We  have  incurred  negative  cash  flow  from  operations  since  we  started  our  business.  We  have 
spent, and expect to continue to spend, substantial amounts in connection with implementing our business 
strategy,  including  our  planned  product  development  efforts,  our  clinical  trials,  and  our  research  and 
development efforts.  Total cash, including restricted cash, and marketable securities, was $14,678,344 as 
of December 31, 2012.    Based on our current plans and our capital resources, we believe that our cash, 
restricted  cash,  and  marketable  securities  will  be  sufficient  to  enable  us  to  meet  our  minimum  planned 
operating  needs  over  the  next  eighteen  months  which  would  entail  focusing  our  resources  on  Phase  II 
clinical trials of Archexin, Phase I clinical trials of RX-3117 and RX-5902, and the further development 
of our preclinical pipeline. Over the next twelve months, we expect to spend a minimum of approximately 
$1.8  million  for  Phase  II  clinical  trials  of  Archexin.    We  also  expect  to  pay  $2.5  million  on  the 
development of RX-3117 and RX-5902, $2.6 million for the development of our preclinical pipeline and 
general research and development costs, $3.1 million on general corporate expenses, and approximately 
$220,000 on facilities rent. These figures include our commitments described earlier under “Contractual 
Obligations” under this Item 7.    We will need to seek additional financing to implement and fund drug 
candidate development, clinical trial and research and development efforts to the maximum extent of our 
operating  plan,  including  in-vivo  animal  and  pre-clinical  studies,  clinical  trials  for  new  product 
candidates,  as  well  as  other  research  and  development  projects.  If  we  are  not  able  to  secure  additional 
financing, we may not be able to implement and fund the research and development 

37 

 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
However, the actual amount of funds we will need to operate is subject to many factors, some of 

which are beyond our control.    These factors include the following: 

• 

• 

• 

• 

the progress of our product development activities; 

the number and scope of our product development programs; 

the progress of our pre-clinical and clinical trial activities; 

the  progress  of  the  development  efforts  of  parties  with  whom  we  have  entered  into 
collaboration agreements; 

•  our ability to maintain current collaboration programs and to establish new collaboration 

arrangements; 

• 

• 

the  costs  involved  in  prosecuting  and  enforcing  patent  claims  and  other  intellectual 
property rights; and 

the costs and timing of regulatory approvals. 

Impact of Inflation 

To date inflationary factors have not had a significant effect on our operations. 

Off-Balance Sheet Arrangements 

We do not have any off-balance sheet arrangements.     

Item 7A.    Quantitative and Qualitative Disclosures About Market Risk. 

For the year ended December 31, 2012, we are exposed to the following market risks: 

Interest Rate Risk 

We invest our cash in a variety of financial instruments.    At December 31, 2012, our cash was 
invested primarily in short term bank deposits and municipal obligations, all of which were denominated 
in  U.S.  dollars.    Due  to  the  conservative  nature  of  these  investments,  which  primarily  bear  interest  at 
fixed rates, we do not believe we have material exposure to interest rate risk.    At December 31, 2012, we 
had no debt instruments on our balance sheet.     

Foreign Currency Risk 

We are exposed to risks associated with foreign currency transactions on contracts with vendors 
associated outside of the United States.    Accordingly changes in the value of the U.S. dollar, relative to 
other currencies, may have an impact on our financial statements and earnings.    The number and dollar 
amount of contracts denominated in foreign currency is immaterial; therefore, we believe we do not have 
material exposure to foreign currency risk.           

38 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 8.    Financial Statements and Supplementary Data. 

Our financial statements and the Report of the Independent Registered Public Accounting Firm 
thereon filed pursuant to this Item 8 and are included in this annual report on Form 10-K beginning on 
page F-1. 

Item 9. Changes In and Disagreements With Accountants on Accounting and Financial Disclosure. 

None. 

Item 9A.    Controls and Procedures.   

Evaluation  of  Disclosure  Controls  and  Procedures.  Under  the  supervision  and  with  the 
participation of our management, including our Chief Executive Officer and Chief Financial Officer, we 
evaluated  the  effectiveness  of  the  design  and  operation  of  our  disclosure  controls  and  procedures  (as 
defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934 (the “Exchange Act”)) 
as of the end of the period covered by this report. Based upon that evaluation, our Chief Executive Officer 
and  Chief  Financial  Officer  concluded  that  our  disclosure  controls  and  procedures  as  of  the  end  of  the 
period covered by this report were effective such that the information required to be disclosed by us in 
reports filed under the Exchange Act is (i) recorded, processed, summarized and reported within the time 
periods specified in the SEC’s rules and forms and (ii) accumulated and communicated to our management, 
including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions 
regarding disclosure. A controls system cannot provide absolute assurance, however, that the objectives of 
the controls system are met, and no evaluation of controls can provide absolute assurance that all control 
issues and instances of fraud, if any, within a company have been detected. 

Changes  in  Internal  Control  Over  Financial  Reporting.    During  the  most  recent  quarter  ended 
December 31, 2012, there has been no change in our internal control over financial reporting (as defined in 
Rule 13a-15(f) and 15d-15(f) under the Exchange Act) ) that has materially affected, or is reasonably likely 
to materially affect, our internal control over financial reporting. 

39 

 
 
 
 
 
 
 
 
 
MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING 

Our  management  is  responsible  for  establishing  and  maintaining  adequate  internal  control  over 
financial  reporting  (as  defined  in  Rule 13a-15(f)  under  the  Exchange  Act).    Our  internal  control  over 
financial  reporting  is  a  process  designed  to  provide  reasonable  assurance  regarding  the  reliability  of 
financial  reporting  and the  preparation of  financial statements  for  external purposes  in  accordance  with 
generally accepted accounting principles and includes those policies and procedures that:     

• 

• 

• 

Pertain to the maintenance of records that, in reasonable detail, accurately and fairly 
reflect the transactions and the 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  authorization  of  management  and  the  board  of 
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 
misstatements.    Also, projections of any evaluations of effectiveness to future periods are subject to risk 
that controls may become inadequate because of changes in conditions or because of declines in the degree 
of compliance with the policies or procedures.     

Our management, with the participation of the Chief Executive Officer and Chief Financial Officer, 
assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 
2012.    In making this assessment, the Company’s management used the criteria set forth by the Committee 
of  Sponsoring  Organizations  of  the  Treadway  Commission  (COSO)  in  Internal  Control-Integrated 
Framework.     

Based on this evaluation, our management, with the participation of the Chief Executive Officer and 
Chief  Financial  Officer,  concluded  that,  as  of  December  31,  2012  our  internal  control  over  financial 
reporting was effective.     

This  annual  report  does  not  include  an  attestation  report  of  the  Company’s  registered  public 
accounting firm regarding internal controls over financial reporting.    Management’s report was not subject 
to attestation by the Company’s registered public accounting firm pursuant to temporary rules of the SEC 
that permit the Company to provide only management’s report in this annual report. 

40 

 
 
 
 
 
 
 
 
 
 
 
 
 
Item 9B.    Other Information. 

None. 

41 

 
 
PART III 

Item 10.    Directors, Executive Officers and Corporate Governance. 

The  information  to  be  provided  under  the  caption  “Election  of  Directors,”  to  be  contained  in  the 
Definitive Proxy Statement and required to be disclosed in this Item 10, is hereby incorporated by reference in 
this  Item  10;  and  the  information  to  be  provided  under  the  caption  “Section  16(a)  Beneficial  Ownership 
Reporting  Compliance,”  to  be  contained  in  the  Definitive  Proxy  Statement  and  required  to  be  disclosed 
pursuant to Section 16(a) of the Exchange Act, is also hereby incorporated by reference in this Item 10.     

Code of Ethics 

We have adopted a code of ethics that applies to our principal executive officer, principal financial 
officer, principal accounting officer or controller, or persons performing similar functions.    Rexahn’s Code 
of Ethics is posted on its website, which is located at www.rexahn.com.     

We  intend  to  satisfy  any  disclosure  requirement  regarding  an  amendment  to,  or  waiver  from,  a 
provision of this code of ethics by posting such information on our website, at the address specified above.     

Item 11.    Executive Compensation. 

The information to be provided under the caption “Executive Compensation and Other Matters,” to be 
contained  in  the  Definitive  Proxy  Statement  and  required  to  be  disclosed  in  this  Item 11,  is  hereby 
incorporated by reference in this Item 11. 

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

The  information  to  be  provided  under  the  captions  “Equity  Compensation  Plan  Information”  and 
“Security Ownership of Management and Certain Security Holders,” each to be contained in the Definitive 
Proxy  Statement  and  required  to  be  disclosed  in  this  Item 12,  is  hereby  incorporated  by  reference  in  this 
Item 12. 

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

Related Transactions 

The information to be provided under the caption “Certain Relationships and Related Transactions,” 
to  be  contained  in  the  Definitive  Proxy  Statement  and  required  to  be  disclosed  in  this  Item  13,  is  hereby 
incorporated by reference in this Item 13.     

Item 14.    Principal Accounting Fees and Services. 

The information to be provided under the caption “Proposal 2 Ratification of the Appointment of the 
Independent Registered Public Accounting Firm, Fees,” to be contained in the Definitive Proxy Statement and 
required to be disclosed in this Item 14, is hereby incorporated by reference in this Item 14.   

42 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 15.    Exhibits, Financial Statement Schedules. 

(a)  The following documents are filed as a part of this Annual Report on Form 10-K:   

(1)   Financial Statements: 

 Report of ParenteBeard LLC 

 Balance Sheet as of December 31, 2012 and    December 31, 2011 

 Statement of Operations for the years ended December 31, 2012, December 31, 2011,   
 and cumulative from March 19, 2001 (Inception) to December 31, 2012 

F-1 

F-2 

F-3 

 Statement of Comprehensive Loss for the years ended December 31, 2012, December 31, 2011,   F-4 
 and cumulative from March 19, 2001 (Inception) to December 31, 2012 

Statement of Stockholders’ Equity (Deficit) from March 19, 2001 (Inception) to December 31, 
2012 

F-5 

 Statement of Cash Flows for the years ended December 31, 2012, December 31, 20101   
 and cumulative from March 19, 2001 (Inception) to December 31, 2012 

 Notes to the Financial Statements 

(2)   Exhibits: 

F-8 

F-10 

The documents listed below are filed with this Annual Report on Form 10-K as exhibits or 
incorporated into this Annual Report on Form 10-K by reference as noted: 

Exhibit 
Number 
3.1 

3.2 

4.1 

4.2 

4.3 

*10.1.1 

*10.1.2 

*10.1.3 

*10.2 

Exhibit Description 

Amended and Restated Certificate of Incorporation, filed as Appendix G to the Company’s 
Definitive Proxy Statement on Schedule 14A (File No. 000-50590) dated April 29, 2005, is 
incorporated herein by reference. 
Amended and Restated Bylaws, filed as Exhibit 3.1 to the Company’s Current Report on 
Form 8-K filed on March 26, 2010, is incorporated herein by reference. 
Specimen Certificate for the Company’s Common Stock, par value $.0001 per share, filed as 
Exhibit 4.3 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Form of Senior Debt Securities Indenture, filed as Exhibit 4.3 to the Company’s Registration 
Statement on Form S-3 dated June 22, 2011, is incorporated herein by reference. 
Form of Subordinated Debt Securities Indenture, filed as Exhibit 4.3 to the Company’s 
Registration Statement on Form S-3 dated June 22, 2011 is incorporated herein by reference.     
Rexahn Pharmaceuticals, Inc. Stock Option Plan, as amended, filed as Exhibit 4.4 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Employees, filed as Exhibit 4.5.1 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Non-Employee Directors and Consultants, filed as 
Exhibit 4.5.2 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and C. H. Ahn, filed as Exhibit 10.1 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 

43 

 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
  
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
  
  
   
 
  
 
  
     
 
    
  
 
 
 
 
 
 
*10.3 

10.4 

*10.5 

10.6 

10.7 

10.8 

10.9 

10.10 

10.11 

10.12 

10.13 

10.14 

10.15 

10.16 

10.17 

10.18 

Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and T. H. Jeong, filed as Exhibit 10.3 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Lease Agreement, dated June 5, 2009, by and between Rexahn Pharmaceuticals, Inc. and The 
Realty Associates Fund V, L.P., filed as Exhibit 10.4 to the Company’s Quarterly Report on 
Form 10-Q for the quarterly period ended June 30, 2009, is incorporated herein by reference 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and Rakesh Soni, filed as Exhibit 10.2 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Securities Purchase Agreement, dated as of May 19, 2009 by and between Rexahn 
Pharmaceuticals, Inc. and the purchaser signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K filed on May 20, 2009, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Series I, II, and III Common Stock Purchase Warrants, 
filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on May 20, 2009, is 
incorporated herein by reference. 
Research and Exclusive License Option Agreement, dated as of June 26, 2009, by and 
between Rexahn Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited, filed as 
Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on September 21, 2009, is 
incorporated herein by reference.   
Securities Purchase Agreement, dated as of June 26, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited (the “Teva Securities 
Purchase Agreement”), filed as Exhibit 10.2 to the Company’s Current Report on Form 8-K 
filed on September 21, 2009, and Amendment No. 1 to the Teva Securities Purchase 
Agreement, filed as Exhibit 10.3 to the Company’s Current Report on Form 8-K filed on 
September 21, 2009, are incorporated herein by reference. 
Securities Purchase Agreement, dated as of October 19, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on October 20, 2009, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on October 20, 2009, is incorporated 
herein by reference. 
Securities Purchase Agreement, dated as of June 28, 2010 by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on June 29, 2010, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on June 29, 2010, is incorporated herein 
by reference. 
Amendment No. 2 to the Teva Securities Purchase Agreement, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K filed on January 20, 2011, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on March 30, 2011, is incorporated 
herein by reference. 
Amendment No.2 to the Research and Exclusive License Agreement, dated November 27, 
2012, by and between Rexahn Pharmaceuticals, Inc. and Teva Pharmaceutical Industries, 
Limited, filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on 
November 27, 2012, is incorporated herein by reference.   
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on November 30, 2012, is incorporated 
herein by reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.2 
to the Company’s Current Report on Form 8-K filed on November 30, 2012 is incorporated 
herein by reference. 

44 

 
14 

16 

23 
24 

31.1 

31.2 

Code of Ethics and Business Conduct, filed as Exhibit 14 to the Company’s Annual Report on 
10-K for the fiscal year ended December 31, 2008, filed on March 16, 2009, is incorporated 
herein by reference. 
Letter of Lazar Levine & Felix LLP dated February 27, 2009, filed as Exhibit 16.1 to the 
Company’s Amended Current Report on Form 8-K filed on March 2, 2009, is incorporated 
herein by reference. 
Consent of ParenteBeard LLC, independent registered public accounting firm.     
Power of Attorney 

Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a).   

Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). 

32.1 

32.2 

Certification of Chief Executive Officer of Periodic Report Pursuant to 18 U.S.C. 
Section 1350. 
Certification of Chief Financial Officer of Periodic Report Pursuant to 18 U.S.C. 
Section 1350. 
**101.INS  XBRL Instance Document 
**101.SCH  XBRL Taxonomy Extension Schema 
**101.CAL  XBRL Taxonomy Calculation Linkbase 
**101.DEF  XBRL Taxonomy Definition Linkbase 
**101.LAB  XBRL Taxonomy Label Linkbase 
**101.PRE  XBRL Taxonomy Presentation Linkbase 

_______________________ 
* Management contract or compensation plan or arrangement.   

**Pursuant to Rule 406T of Regulation S-T, these interactive data files are deemed not filed or part of a 
registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, as 
amended, and is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as 
amended, and is otherwise not subject to liability under these sections. 

45 

 
 
 
 
SIGNATURES 

In accordance with the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the issuer 
has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on this 22 
day of March, 2013. 

REXAHN PHARMACEUTICALS, INC. 

By:    /s/ Peter D. Suzdak 
Peter D. Suzdak 
Chief Executive Officer 

In accordance with the requirement of the Securities Exchange Act of 1934, this report has been signed on the 
22 day of March, 2013 by the following persons on behalf of the issuer and in the capacities indicated: 

Name 

Title 

/s/ Peter Suzdak* 
Peter Sudzak 
/s/ Tae Heum Jeong* 
Tae Heum Jeong 
/s/ Chang H. Ahn* 
Chang H. Ahn 
/s/ Peter Brandt* 
Peter Brandt 
/s/ David McIntosh* 
David McIntosh 
/s/ Charles Beever* 
Charles Beever 
/s/ Kwang Soo Cheong*  
Kwang Soo Cheong 
/s/ Richard Kivel* 
Richard Kivel 
/s/ Si Moon Hwang* 
Si Moon Hwang 

Chief Executive Officer (Principal Executive 
Officer) 
Chief Financial Officer, and Secretary 
(Principal Financial and Accounting Officer) 
Chairman 

Director 

Director 

Director 

Director 

Director 

Director 

* By: /s/ Tae Heum Jeong, Attorney-in Fact 

Tae Heum Jeong, Attorney-in-Fact** 

** By authority of the power of attorney filed as Exhibit 24 hereto.   

46 

 
 
   
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm 

To the Board of Directors 
Rexahn Pharmaceuticals, Inc. 

We have audited the accompanying balance sheet of Rexahn Pharmaceuticals, Inc. (the “Company”) (a 
development stage company) as of December 31, 2012 and 2011, and the related statements of operations, 
comprehensive loss, stockholders’ equity (deficit), and cash flows for each of the years then ended, and the 
cumulative period from March 19, 2001 (inception) to December 31, 2012.    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 Oversight 
Board (United States). Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether the financial statements are free of material misstatement.    An audit includes 
examining, on a test basis, evidence supporting 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 overall financial statement presentation. We believe that our audits provide a 
reasonable basis for our opinion. 

In our opinion, the financial statements referred to above, present fairly, in all material respects, the 
financial position of Rexahn Pharmaceuticals, Inc. as of December 31, 2012 and 2011, and the results of its 
operations and its cash flows for the years then ended, and the cumulative period from March 19, 2001 
(inception) to December 31, 2012, in conformity with accounting principles generally accepted in the United 
States of America. 

/s/ PARENTEBEARD LLC 

Reading, Pennsylvania 
March 22, 2013

F-1 

 
 
 
 
  
 
 
 
  
  
  
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Balance Sheet 

December 31, 2012 

December 31, 2011 

ASSETS 

Current Assets: 

Cash and cash equivalents 
Marketable securities (note 3) 
Prepaid expenses and other current assets (note 4) 
Note receivable – current portion (note 5) 

Total Current Assets 
Restricted Cash Equivalents (note 15) 
Equipment, Net (note 6) 
Total Assets 

$ 

$ 

  13,486,543    $ 
  100,000   
  188,808   
  -  
  13,775,351   
  1,091,801   
  52,156   
  14,919,308    $ 

  9,861,488  
  1,950,000  
  333,171  
  18,682  
  12,163,341  
  1,431,765  
  94,542  
  13,689,648  

LIABILITIES AND STOCKHOLDERS’ EQUITY 

Current Liabilities: 

Accounts payable and accrued expenses (note 7) 

$ 

  851,837    $ 

  1,185,405  

Deferred Research and Development Arrangements (note 8)    

  1,626,000   

  825,000  

Other Liabilities (note 9) 

  65,417   

  104,388  

Warrant Liabilities (note 12) 

  2,842,065   

  868,725  

Total Liabilities   
Commitments and Contingencies (note 15) 
Stockholders’ Equity (note 10): 

Preferred stock, par value $0.0001, 100,000,000 authorized             
      shares, none issued and outstanding 
Common stock, par value $0.0001, 500,000,000 authorized   
shares, 119,443,194 and 95,359,861 issued and 119,428,989 
and 95,345,656 outstanding 
Additional paid-in capital 
Accumulated deficit during the development stage 
Treasury stock, 14,205 shares, at cost 

  5,385,319   

  2,983,518  

-  

- 

  11,944  
  72,861,738   
  (63,311,283)  
  (28,410)  

  9,536  
  67,809,617  
  (57,084,613) 
  (28,410) 

Total Stockholders’ Equity 

  9,533,989   

  10,706,130  

Total Liabilities and Stockholders’ Equity   

$ 

  14,919,308    $ 

  13,689,648  

(See accompanying notes to the financial statements) 
F-2 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
  
 
 
 
   
 
   
 
 
 
   
 
   
 
 
 
   
 
   
 
 
   
 
   
   
 
   
 
  
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Operations 

For the Year Ended December 31 
2011 
2012 

Cumulative 

from March 19, 

2001 
(Inception) to 
December 31, 

2012 

$ 

  - 

$ 

  - 

$ 

  - 

Revenues: 

Research 

Expenses: 

General and administrative 

Research and development 

Patent fees 

Depreciation and amortization 

  2,713,149 

  3,392,896 

  431,099 

  42,386 

  3,547,829 

  11,992,087 

  546,027 

  45,070 

  30,060,144 

  35,278,499 

  2,532,104 

  682,923 

Total Expenses 

  6,579,530  

  16,131,013  

  68,553,670 

Loss from Operations 

  (6,579,530)  

  (16,131,013)  

  (68,553,670) 

Other Income (Expense) 

Realized loss on marketable           
securities                  .         
Interest income 

Interest expense 

Other income 
Unrealized gain on fair value of 
warrants 
Unrealized gain on fair value of           
put feature on common stock 
Financing expense 

Beneficial conversion feature 

Total Other Income (Expense) 

Net Loss Before Provision for Income 
Taxes 
Provision for income taxes 
Net Loss 

Net loss per share, basic and diluted 

- 

  21,092 

- 

- 

  (3,960) 

  109,240 

  - 

  - 

  663,876 

  4,778,450 

  - 

  (97,667) 

  - 
  4,786,063  

  (13,301) 

  1,442,399 

  (301,147) 

  56,047 

  4,339,981 

  2,315,539 

  (972,131) 

  (1,625,000) 

  5,242,387 

  (11,344,950) 

  -  
  (11,344,950) 

  (63,311,283) 

  - 
  (63,311,283) 

$ 

  (0.12) 

$ 

$ 

- 

  (332,108) 

- 

  352,860  

  (6,226,670) 

  -  

  (6,226,670) 

  (0.06) 

$ 

$ 

Weighted average number of shares 
outstanding, basic and diluted 

  97,138,233 

  93,048,490 

(See accompanying notes to the financial statements) 

F-3 

 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Comprehensive Loss 

For the Year Ended December 31, 

2012 

2011 

Cumulative 

from March 19, 

2001 

(Inception) to           
December 31,   
2012 

Net Loss 

Reversal of unrealized loss on securities 
available-for-sale 

Total Comprehensive Loss 

$ 

$ 

  (6,226,670) $ 

  (11,344,950) $ 

  (63,311,283) 

  -  

  2,340  

  - 

  (6,226,670) $ 

  (11,342,610) $ 

  (63,311,283) 

(See accompanying notes to the financial statements) 

F-4 

 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Stockholders’ Equity (Deficit) 
Period from March 19, 2001 (Inception) to December 31, 2012 

Common Stock 

Treasury Stock 

Number of 
Shares 

  Amount 

Additional 
Paid-in 
Capital 

Opening Balance,   
March 19, 2001 

  - $ 

  - $ 

  - $ 

Common Stock issued 

  7,126,666   

  71,266   

  4,448,702   

Accumulated 
Deficit During 
the 
Development 
Stage 

  -  

  -  

Net loss 

Balances at   
December 31, 2001 
Net loss 

Balances at   
December 31, 2002 
Common Stock issued 

Stock based compensation  
Net loss 

Balances at   
December 31, 2003 
Common Stock issued 

Stock based compensation  
Net loss 

Balances at   
December 31, 2004 
Stock split (5 for 1) 

Common Stock issued in 
connection with merger 

Common Stock issued for 
cash 

Common Stock issued on 
conversion of convertible 
debt 

Stock options exercised 

Common stock issued in 
exchange for services 

Beneficial conversion 
feature 

Stock based compensation  
Net Loss 

Balances at   
December 31, 2005 

  -  

  -  

  -  

  (625,109)  

  7,126,666   

  71,266   

  4,448,702   

  7,126,666   
  500,000   

  71,266   
  5,000   

  4,448,702   
  1,995,000   

  -  
  -  

  -  
  -  

  538,074   
  -  

  7,626,666   
  1,500   

  76,266   
  15   

  6,981,776   
  1,785   

  -  
  -  

  -  
  -  

  230,770   
  -  

  (625,109)  
  (1,181,157)  

  (1,806,266)  
  -  

  -  
  (2,775,075)  

  (4,581,341)  
  -  

  -  
  (3,273,442)  

  7,628,166   
  30,512,664   

  76,281   
  (72,467)  

  7,214,331   
  72,467   

  (7,854,783)  
  -  

  3,397,802   

  340   

  (340)  

  4,175,000   

  417   

  8,349,565   

  650,000   

  40,000   

  65   

  1,299,935   

  4   

  9,596   

  7,000   

  1   

  21,876   

  1,625,000   

  -  

  -  
  -  

  -  

  -  
  -  

  436,748   
  -  

  -  
  (6,349,540)  

  46,410,632   

  4,641   

  19,029,178   

  (14,204,323)  

Number of 
Shares 

  Amount 

Accumulated 
Other 
Comprehensive 
Loss 

Total 
Stockholders' 
Equity 
(Deficit) 

  - $ 

  - $ 

  - $ 

  - 

  -  

  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  

  -  

  -  

  -  

  -  

  -  

  -  
  -  

  -  

  -  

  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  

  -  

  -  

  -  

  -  

  -  

  -  
  -  

  -  

  -  

  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  

  -  

  -  

  -  

  -  

  -  

  -  
  -  

  -  

  4,519,968  

  (625,109) 

  3,894,859  
  (1,181,157) 

  2,713,702  
  2,000,000  

  538,074  
  (2,775,075) 

  2,476,701  
  1,800  

  230,770  
  (3,273,442) 

  (564,171) 
  - 

  - 

  8,349,982  

  1,300,000  

  9,600  

  21,877  

  1,625,000  

  436,748  
  (6,349,540) 

  4,829,496  

  -  

  -  

  -  

  -  

  -  

  -  

(See accompanying notes to the financial statements) 

F-5 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Stockholders’ Equity (Deficit) (continued) 
Period from March 19, 2001 (Inception) to December 31, 2012 

Common Stock 

Treasury Stock 

Number of 
Shares 

  Amount   

Additional 
Paid-in 
Capital 

Accumulated 
Deficit 
During the 
Development 
Stage 

Number of 
Shares 

  Amount   

Accumulated 
Other 
Comprehensive 
Loss 

Total 
Stockholders' 
Equity 
(Deficit) 

Balances at   
December 31, 2005 

  46,410,632   

  4,641   

19,029,178   

  (14,204,323)  

Stock options exercised 

  61,705   

  6   

  14,802   

Common Stock issued on conversion of 
convertible debt 

  3,850,000   

  385   

  3,849,615   

  -  

  -  

  -  

  -  

  -  

  -  

  -  

  -  

Purchase of treasury stock 
Stock based compensation 
Net loss 

Balances at   
December 31, 2006 
Common stock issued     

Stock options exercised 
Stock based compensation 
Stock issuance costs 
Net loss 

Balances at   
December 31, 2007 
Common stock issued     
Stock options exercised 
Stock based compensation 
Net loss 

Unrealized loss on securities 
available-for-sale 

Balances at   
December 31, 2008 

  -  
  -  
  -  

  -  
  -  
  -  

  -  
  1,033,956   
  -  

  -  
  -  
  (6,486,003)  

  14,205   
  -  
  -  

  (28,410)  
  -  
  -  

  50,322,337   
  4,857,159   

  5,032   
  486   

23,927,551   
  1,144,219   

  (20,690,326)  
  -  

  14,205   
  -  

  (28,410)  
  -  

  127,500   
  -  
  -  
  -  

  12   
  -  
  -  
  -  

  59,988   
  1,121,646   
  (139,674)  
  -  

  -  
  -  
  -  
  (4,442,331)  

  -  
  -  
  -  
  -  

  -  
  -  
  -  
  -  

  55,306,996   
  642,858   
  90,000   
  -  
  -  

  5,530   
  65   
  9   
  -  
  -  

26,113,730   
  155,450   
  31,191   
  484,684   
  -  

  (25,132,657)  
  -  
  -  
  -  
  (3,681,801)  

  14,205   
  -  
  -  
  -  
  -  

  (28,410)  
  -  
  -  
  -  
  -  

  -  

  -  

  -  

  -  

  -  

  -  

  (550,480)  

  (550,480) 

  56,039,854   

  5,604   

26,785,055   

  (28,814,458)  

  14,205   

  (28,410)  

  (550,480)  

  (2,602,689) 

Issuance of common stock and units 
Stock options exercised 
Stock issuance costs 
Stock based compensation 
Net loss 

  15,883,847   
  15,000   
  -  
  -  
  -  

  1,588   
  2   
  -  
  -  
  -  

  9,996,015   
  3,600   
  (641,018)  
  497,531   
  -  

  -  
  -  
  -  
  -  
  (2,903,098)  

Reversal of unrealized loss on securities 
available-for-sale 

Balances at   
December 31, 2009 

  -  

  -  

  -  

  -  

  -  
  -  
  -  
  -  
  -  

  -  

  -  
  -  
  -  
  -  
  -  

  -  

  -  
  -  
  -  
  -  
  -  

  9,997,603  
  3,602  
  (641,018) 
  497,531  
  (2,903,098) 

  550,480   

  550,480  

  71,938,701   

  7,194   

36,641,183   

  (31,717,556)  

  14,205   

  (28,410)  

  -  

  4,902,411  

(See accompanying notes to the financial statements) 

F-6 

  -  

  -  

  4,829,496  

  14,808  

  -  

  3,850,000  

  -  
  -  
  -  

  -  
  -  

  -  
  -  
  -  
  -  

  -  
  -  
  -  
  -  
  -  

  (28,410) 
  1,033,956  
  (6,486,003) 

  3,213,847  
  1,144,705  

  60,000  
  1,121,646  
  (139,674) 
  (4,442,331) 

  958,193  
  155,515  
  31,200  
  484,684  
  (3,681,801) 

 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
   
   
   
   
 
 
   
   
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Stockholders’ Equity (Deficit) (continued) 
Period from March 19, 2001 (Inception) to December 31, 2012 

Common Stock 

Treasury Stock 

Number of 
Shares 

  Amount   

Additional 
Paid-in 
Capital 

Accumulated 
Deficit 
During the 
Development 
Stage 

Number of 
Shares 

  Amount   

Accumulated 
Other 
Comprehensive 
Loss 

Total 
Stockholders' 
Equity 
(Deficit) 

Balances at   
December 31, 2009 

  71,938,701   

  7,194   

36,641,183   

  (31,717,556)  

  14,205   

  (28,410)  

  -  

  4,902,411  

  84,175,054   

  8,418   

56,157,452   

  (45,739,663)  

  14,205   

  (28,410)  

  (2,340)  

  10,395,457  

Issuance of common stock and units 
Stock issuance costs 

  6,666,667   
  -  

  667   
  -  

  8,198,534   
  (681,773)  

Common stock issued in exchange for 
services 
Stock options exercised 
Stock warrants exercised 

  1,700,000   
  155,500   
  3,714,186   

  170   
  16   
  371   

  2,107,830   
  107,224   
  9,199,797   

  -  
  -  

  -  
  -  
  -  

Stock based compensation 
Net loss 

Unrealized loss on securities 
available-for-sale 

Balances at   
December 31, 2010 

  -  
  -  

  -  

  -  
  -  

  -  

  584,657   
  -  

  -  
  (14,022,107)  

  -  

  -  

Issuance of common stock and units 
Stock issuance costs 
Stock options exercised 
Stock warrants exercised 

  10,667,848   
  -  
  183,000   
  333,959   

  1,067   
  -  
  18   
  33   

11,122,265   
  (729,727)  
  59,222   
  561,798   

  -  
  -  
  -  
  -  

Stock based compensation 
Net loss 

- 

Reversal of unrealized loss on securities 
available-for-sale 

Balances at   
December 31, 2011 

- 
  - 
  -  

  -  

  -  
  -  

  -  

  638,607   
  -  

  -  
  (11,344,950)  

  -  

  -  

Issuance of common stock and units 
Stock issuance costs 

  24,083,333   
  -  

  2,408   
  -  

  5,533,472   
  (712,338)  

  -  
  -  

Stock based compensation 
Net loss 

Balances at   
December 31, 2012 

  -  
  -  

  -  
  -  

  230,987   
  -  

  -  
  (6,226,670)  

  -  
  -  

  -  
  -  
  -  

  -  
  -  

  -  

  -  
  -  

  -  
  -  
  -  

  -  
  -  

  -  

  -  
  -  

  -  
  -  
  -  

  -  
  -  

  8,199,201  
  (681,773) 

  2,108,000  
  107,240  
  9,200,168  

  584,657  
  (14,022,107) 

  (2,340)  

  (2,340) 

  -  
  -  
  -  
  -  

  -  
  -  

  -  

  -  
  -  
  -  
  -  

  -  
  -  

  -  

  -  
  -  
  -  
  -  

  -  
  -  

  11,123,332  
  (729,727) 
  59,240  
  561,831  

  638,607  
  (11,344,950) 

  2,340   

  2,340  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  -  
  -  

  5,535,880  
  (712,338) 

  230,987  
  (6,226,670) 

  95,359,861   

  9,536   

67,809,617   

  (57,084,613)  

  14,205   

  (28,410)  

  -  

  10,706,130  

    119,443,194   

  11,944   

72,861,738   

  (63,311,283)  

  14,205   

  (28,410)  

  -  

  9,533,989  

(See accompanying notes to the financial statements) 

F-7 

 
 
 
 
 
   
   
   
   
   
   
   
   
 
 
   
   
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Cash Flows 

Cash Flows from Operating Activities: 
Net loss 

Adjustments to reconcile net loss to net cash used in operating activities: 

Beneficial conversion feature 
Compensatory stock 

Depreciation and amortization 
Stock-based compensation 

Amortization of deferred research and development arrangements 
Note receivable 

Realized losses on marketable securities 
Unrealized gain on fair value of warrants 

Unrealized gain on fair value of put feature on common stock 
Financing expense 

Amortization of deferred lease incentive 
Deferred lease expenses 

Loss on impairment of intangible assets 

Changes in assets and liabilities: 

Prepaid expenses and other current assets 
Research tax credit receivable 

Accounts payable and accrued expenses 

Net Cash Used in Operating Activities 

Cash Flows from Investing Activities: 

Restricted cash equivalents 

Purchase of equipment 
Purchase of marketable securities 

Proceeds from sales of marketable securities 
Payment of licensing fees 

Net Cash Provided by (Used In) Investing Activities 
Cash Flows from Financing Activities: 

Issuance of common stock and units, net of issuance costs 
Proceeds from exercise of stock options 

Proceeds from exercise of stock warrants 
Proceeds from long-term debt 

Proceeds from research and development arrangements 
Purchase of treasury stock 

Net Cash Provided by Financing Activities 
Net Increase (Decrease) in Cash and Cash Equivalents 

Cash and Cash Equivalents – beginning of period 
Cash and Cash Equivalents - end of period 

For the Year Ended 
December 31,   

2012 

2011 

Cumulative 
From March 19, 2001 

(Inception) to   
December 31,   

2012 

 $ 

  (6,226,670) $ 

  (11,344,950) $ 

  (63,311,283) 

-  
-  

  42,386   
  230,987   

  (125,000)  
  18,682   

-  
  (663,876)  

-  
  332,108   

  (20,000)  
  (18,971)  

  -  

  -  
  -  
  45,070   
  638,607   
  (75,000)  
  28,023   
  3,960   
  (4,778,450)  
  -  
  97,667   
  (20,000)  
  (8,729)  
  -  

  144,363   
-  

  (333,568)  
  (6,619,559)  

  373,478   
  145,513   
  (635,495)  
  (15,530,306)  

  339,964   

-  
-  

  1,850,000   
-  

  2,189,964   

  7,128,650   
-  

-  
-  

  926,000   
-  

  8,054,650   
  3,625,055   

  9,861,488   
  13,486,543  $ 

 $ 

  (1,029,872)  
  (16,047)  
  (8,000,000)  
  8,500,000   
  -  
  (545,919)  

  13,220,273   
  59,240   
  317,961   
  -  
  -  
  -  
  13,597,474   
  (2,478,751)  
  12,340,239   
  9,861,488  $ 

  1,625,000  
  2,129,877  

  682,923  
  5,808,616  

  (800,000) 
  - 

  13,301  
  (4,339,981) 

  (2,315,539) 
  972,131  

  (70,000) 
  35,417  

  286,132  

  (188,808) 
- 

  851,837  
  (58,620,377) 

  (1,091,801) 

  (564,995) 
  (21,123,960) 

  21,010,659  
  (356,216) 

  (2,126,313) 

  62,934,224  
  170,082  

  3,581,337  
  5,150,000  

  2,426,000  
  (28,410) 

  74,233,233  
  13,486,543  

  - 
  13,486,543  

(See accompanying notes to the financial statements) 

F-8 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
 
  
  
  
  
  
  
  
  
  
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Cash Flows (continued) 

Supplemental Cash Flow Information 

Interest paid 

Non-cash financing and investing activities: 

Warrants issued 

Put feature on common stock issued 

Dilutive issuances of common stock 

Warrant liability extinguishment from exercise of warrants 

Leasehold improvement incentive 

Settlement of lawsuit 

Cumulative 

From March 19, 2001 

For the Year Ended 

December 31, 

(Inception) to   

December 31, 

2012 

2011 

2012 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

- $ 

              - $ 

  301,147  

  2,637,216  $ 
  - $ 

- $ 

-  

- $ 

- $ 

  2,924,333  $ 
  - $ 
- $ 
  243,868  $ 
  - $ 
  - $ 

  13,691,643  

  4,954,738  

  2,639,199  

  6,180,660  

  100,000  

  43,953  

(See accompanying notes to the financial statements) 

F-9 

 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

1.  Operations and Organization 

Operations 

Rexahn  Pharmaceuticals,  Inc.  (the  “Company”,  “Rexahn  Pharmaceuticals”),  a  Delaware  corporation,  is  a 
development stage biopharmaceutical company dedicated to the discovery, development and commercialization 
of  innovative  treatments  for  cancer,  central  nervous  system  (“CNS”)  disorders,  sexual  dysfunction  and  other 
medical needs.    The Company had an accumulated deficit of $63,311,283 at December 31, 2012 and anticipates 
incurring  losses  through  fiscal  2013  and  beyond.    The  Company  has  not  yet  generated  commercial  sales 
revenue  and  has  been able  to fund its  operating  losses  to  date through  the sale of  its  common  stock,  warrants 
exercisable  for  common  stock,  issuance  of  long-term  debt,  and  proceeds  from  reimbursed  research  and 
development  costs.    The  Company  believes  that  its  existing  cash,  cash  equivalents,  and  marketable  securities 
will be sufficient to cover its cash flow requirements into 2014.    Management has the capability of managing 
the  Company’s  operations  within  existing  cash  available  by  focusing  on  select  research  and  development 
activities, and selecting projects in conjunction with potential financings and milestones. 

Reverse Merger Acquisition 

Pursuant  to  an  Agreement  and  Plan  of  Merger  by  and  among  Rexahn,  Corp  (“Rexahn”),  Corporate  Road 
Show.Com  Inc. (“CRS”), a New York corporation and predecessor corporation of the Company, CRS Merger 
Sub, Inc., a Delaware corporation and wholly owned subsidiary of CRS (“Merger Sub”), CRS Delaware, Inc., a 
Delaware  corporation  and  wholly  owned  subsidiary  of  CRS,  immediately  after  giving  effect  to  a  1-for-100 
reverse  stock  split  and  the  reincorporation  of  CRS  as  a  Delaware  corporation  under  the  name  Rexahn 
Pharmaceuticals, Inc. (“Rexahn Pharmaceuticals”), on May 13, 2005, Merger Sub merged with and into Rexahn, 
with Rexahn surviving as a wholly owned subsidiary of Rexahn Pharmaceuticals (the “Acquisition Merger”). In 
the  Acquisition  Merger,  (i)  each  share  of  the  issued  and  outstanding  common  stock  of  Rexahn  (other  than 
dissenting shares) was converted into the right to receive five shares of Rexahn Pharmaceuticals common stock; 
and  (ii)  each  issued,  outstanding  and  unexercised  option  to  purchase  a  share  of  Rexahn  common  stock  was 
converted into an option to purchase five shares of Rexahn Pharmaceuticals common stock. 

Shares  of  Rexahn  Pharmaceuticals  common  stock  issued  in  the  Acquisition  Merger  were  exempt  from  the 
registration  requirements  of  the  Securities  Act  of  1933,  as  amended  (the  “Securities  Act”),  pursuant  to 
Regulation  D  under  the  Securities  Act  and/or  Regulation  S  under  the  Securities  Act.  These  shares  of  Rexahn 
Pharmaceuticals  common  stock  are  deemed  “restricted  securities”  and  bear  an  appropriate  restrictive  legend 
indicating that the resale of such shares may be made only pursuant to registration under the Securities Act or 
pursuant to an available exemption from such registration. 

For  accounting  purposes,  the  Acquisition  Merger  was  accounted  for  as  a  reverse  acquisition  of  CRS  (legal 
acquirer)  by  Rexahn  (accounting  acquirer).    As  a  result,  following  the  Acquisition  Merger,  the  historical 
financial statements of Rexahn became the historical financial statements of the Company. 

Merger of Subsidiary 

On  September  29,  2005,  the  Company’s  wholly  owned  subsidiary,  Rexahn,  was  merged  with  and  into  the 
Company and Rexahn’s separate existence was terminated. 

F-10 

 
 
 
 
  
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

2. 

Summary of Significant Accounting Policies 

a)    Cash and Cash Equivalents 

Cash and cash equivalents include cash on hand and short-term investments purchased with remaining 
maturities of three months or less at acquisition. 

b)    Marketable Securities 

Marketable  securities  are  considered  “available-for-sale”  in  accordance  with  Financial  Statement 
Accounting  Board  (“FASB”)  Accounting  Standard  Codification  (“ASC”)  320,  “Debt  and  Equity 
Securities”,  and  thus  are  reported  at fair  value in  our  accompanying  balance sheet,  with  unrealized  gains 
and losses excluded from earnings and reported as a separate component of stockholders’ equity.    Realized 
gains and losses are accounted for on the basis of specific identification and are included in other income or 
expense  in  the  statement  of  operations.    The  Company  classifies  such  investments  as  current  on  the 
balance sheet as the investments are readily marketable and available for use in our current operations.     

c)      Equipment 

Equipment is stated at cost less accumulated depreciation. Depreciation, based on the lesser of the term of 
the lease or the estimated useful life of the assets, is provided as follows: 

Life  Depreciation Method 

Furniture and fixtures 
Office equipment 
Lab equipment 
Computer equipment 
Leasehold improvements 

7 years  straight line 
5 years  straight line 
5-7 years  straight line 
5 years  straight line 
3-5 years  straight line 

d)      Research and Development   

Research  and  development  costs  are  expensed  as  incurred.    Research  and  development  expenses  consist 
primarily  of  third  party  service  costs  under  research  and  development  agreements,  salaries  and  related 
personnel costs, as well as stock compensation related to these costs, costs to acquire pharmaceutical products 
and  product  rights  for  development  and  amounts  paid  to  contract  research  organizations,  hospitals  and 
laboratories for the provision of services and materials for drug development and clinical trials. 

Costs incurred in obtaining the licensing rights to technology in the research and development stage that have 
no alternative future uses and are for unapproved product compounds are expensed as incurred. 

e)      Use of Estimates 

The preparation of financial statements in conformity with accounting principles generally accepted in the 
United States requires management to make estimates and assumptions that affect the reported amounts of 
assets  and  liabilities  and  the  disclosure  of  contingent  assets  and  liabilities  at  the  date  of  the  financial 
statements and the reported amounts of revenues and expenses during the reporting period.    These estimates 
are based on management’s best knowledge of current events and actions the Company may undertake in the 
future.    Actual  results  may  ultimately  differ  from  those  estimates.    These  estimates  are  reviewed 
periodically and as adjustments become necessary, they are reported in earnings in the period in which they 
become available.   

f)        Fair Value of Financial Instruments 

The carrying amounts reported in the accompanying financial statements for cash and cash equivalents, note 
receivable,  prepaid  expenses  and  other  current  assets  and  accounts  payable  and  accrued  expenses 
approximate fair value because of the short-term maturity of these financial instruments.    The fair values 
for  marketable  securities,  warrant  liabilities,  the  put  feature  on  common  stock  and  all  other  assets  and 

F-11 

 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

liabilities is discussed in Notes 3, 12, 13, and 16, respectively. 

g)      Income Taxes 

The  Company  accounts  for  income  taxes  in  accordance  with  ASC  740,  “Income  Taxes”.    Deferred  tax 
assets and liabilities are recorded for differences between the financial statement and tax basis of the assets 
and liabilities that will result in taxable or deductible amounts in the future based on enacted tax laws and 
rates.    ASC 740 requires that a valuation allowance be established when it is more likely than not that all 
portions of a deferred tax asset will not be realized.    A review of all positive and negative evidence needs 
to be considered, including a company’s current and past performance, the market environment in which 
the company operates, length of carryback and carryforward periods and existing contracts that will result 
in future profits.    Income tax expense is recorded for the amount of income tax payable or refundable for 
the period, increased or decreased by the change in deferred tax assets and liabilities during the period. 

As  a  result  of  the  Company’s  significant  cumulative  losses,  we  determined  that  it  was  appropriate  to 
establish a valuation allowance for the full amount of our deferred tax assets. 

The  calculation  of  our  tax  liabilities  involves  the  inherent  uncertainty  associated  with  the  application  of 
complex  tax  laws.    We  are  subject  to  examination  by  various  taxing  authorities.    We  believe  that  as  a 
result  of  our  loss  carryforward  sustained  to  date,  any  examination  would  result  in  a  reduction  of  our  net 
operating losses rather than a tax liability.    As such, we have not provided for additional taxes estimated 
under ASC 740. 

h)      Loss Per Share 

The  Company  accounts  for  loss  per  share  pursuant  to  ASC  260,  “Earnings  per  Share”,  which  requires 
disclosure  on  the  financial  statements  of  “basic”  and  “diluted”  loss  per  share.    Basic  loss  per  share  is 
computed by dividing net loss by the weighted average number of common shares outstanding for the year.   
Diluted loss per share is computed by dividing net loss by the weighted average number of common shares 
outstanding  plus  potentially  dilutive  securities  outstanding  for  each  year.  Potentially  dilutive  securities 
include  stock  options  and  warrants.    Diluted  loss  per  share  for  the  years  ended  December  31,  2012  and 
2011, is the same as basic loss per share due to the fact that the Company incurred losses for all periods 
presented and the inclusion of common share equivalents would be antidilutive. The following securities, 
presented on a common share equivalent basis, have been excluded from the per share computations: 

Stock Options 

Warrants 

i)      Stock-Based Compensation 

Year Ended December 31 

2012 

2011 

7,741,795 

7,646,795 

21,656,142 

8,676,142 

In  accordance  with  ASC  718,  “Stock  Compensation,”  compensation  costs  related  to  share-based  payment 
transactions, including employee stock options, are to be recognized in the financial statements. In addition, 
the Company adheres to the guidance set forth within Securities and Exchange Commission (“SEC”) Staff 
Accounting Bulletin (“SAB”) No. 107, which provides the Staff’s views regarding the interaction between 
ASC 718 and certain SEC rules and regulations, and provides interpretations with respect to the valuation 
of share-based payments for public companies.   

j)      Impairment of Long-Lived Assets 

In accordance with ASC 360, “Property, Plant and Equipment,” long-lived assets to be held and used are 
analyzed  for  impairment  whenever  events  or  changes  in  circumstances  indicate  that  the  related  carrying 
amounts may not be recoverable.    The Company evaluates at each balance sheet date whether events and 
circumstances have occurred that indicate possible impairment.    If there are indications of impairment, the 
Company uses future undiscounted cash flows of the related asset or asset grouping over the remaining life in 
measuring whether the assets are recoverable.    In the event such cash flows are not expected to be sufficient 

F-12 

 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

to recover the recorded asset values, the assets are written down to their estimated fair value.    Management 
determined  that  an  impairment  of  intangible  assets  occurred  in  2009  and  wrote-off  the  assets  remaining 
carrying  value  of  $286,132,  which  is  reflected  in  research  and  development  expenses  in  the  Company’s 
statement of operations for the year ended December 31, 2009. 

k)      Concentration of Credit Risk 

The  Company  does  not  have  significant  off-balance  sheet  risk  or  credit  concentration.    The  Company 
maintains  cash  and  short-term  investments  with  major  financial  institutions.    From  time  to  time  the 
Company has funds on deposit with commercial banks that exceed federally insured limits.    The balances are 
insured by either the Federal Deposit Insurance Corporation or the Securities Investor Protection Corporation 
up to $250,000. At December 31, 2012, the Company’s uninsured cash balance was $13,805,740.   

l)        Recent Accounting Pronouncements Affecting the Company 

Fair Value Measurements 

In  May  2011,  the  FASB  issued  Accounting  Standards  Update  2011-04  to  ASC  820,  “Fair  Value 
Measurements  and  Disclosures”  (“ASC  820”)  which  amends  the  disclosure  requirements  for  fair  value 
instruments.    The  new  disclosures  required  include  disclosure  regarding  the  sensitivity  of  the  fair  value 
measurement  to  changes  in  unobservable  inputs,  and  the  interrelationships  between  those  unobservable 
inputs.    The guidance is effective for the Company for fiscal years and interim periods beginning on or after 
December 15, 2011.    The Company adopted this guidance during the first quarter of 2012. 

Comprehensive Income 

In  June  2011,  the  FASB  issued  authoritative  guidance  for  presentation  and  disclosure  of  comprehensive 
income  in  the  financial  statements.    Under  the  new  guidance,  a  company  may  no  longer  present  the 
components  of  other  comprehensive  income  as  part  of  the  statement  of  changes  in  the  statement  of 
stockholders’  equity,  and  instead  must  present  the  components  of  comprehensive  income  either  in  the 
statement of operations or in a separate statement immediately following the Statement of Operations.    In 
addition, reclassification adjustments between comprehensive income and net income must be disclosed on 
the financial statements.    This guidance is effective for the Company for fiscal years and interim periods 
beginning on or after December 15, 2011.    The Company adopted this guidance during the first quarter of 
2012 

In February, 2013 the FASB issued Accounting Standards Update 2013-02, “Comprehensive Income: 
Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” to improve the 
transparency of reporting reclassifications from comprehensive income to net income.    The new 
amendments require that a company must present the effects on line items of net income of significant 
amounts reclassified out of accumulated other comprehensive income, and additional referencing and 
disclosure regarding these items.    The guidance is effective for the Company for fiscal years and interim 
periods beginning on or after December 15, 2012.    Management believes that the adoption of this 
guidance will not have a material impact on the financial statements. 

F-13 

 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

3.    Marketable Securities 

Cost and fair value of the Company’s marketable securities are as follows: 

Securities available-for-sale 
          December 31, 2012: 

State and municipal obligations 

          December 31, 2011: 

State and municipal obligations 

$ 

$ 

Cost 
Basis 

  Gross Unrealized 
Gains/(Losses) 

Fair 
Value 

  100,000  $ 

  - $ 

  100,000  

  1,950,000  $ 

  - $ 

  1,950,000  

Amortized  cost  and  fair  value  at  December  31,  2012  by  contractual  maturity  are  shown  below.    Expected 
maturities will differ from contractual maturities because the Company may redeem certain securities at par.     

Maturity 
10 years or more 

Cost 
Basis 

Fair 
Value 

$ 

100,000  $ 

100,000 

During  the  year  ended  December  31,  2012  and  2011,  the  Company  sold  $1,850,000  and  $8,500,000, 
respectively,  of  securities  at  par  and  the  total  amount  that  was  reclassified  from  accumulated 
comprehensive loss into net loss was $0, and $3,960, respectively.         

4.    Prepaid Expenses and Other Current Assets 

Deposits on contracts 
Other assets 

December 31,   
2012 

December 31,   
2011 

  $ 

  $ 

  12,818   $ 
  175,990  

  188,808   $ 

  163,317  
  169,854  

  333,171  

Deposits  on  contracts  consist  of  deposits  on  research  and  development  contracts  for  services  that  had  not  been 
incurred as of the balance sheet date.    Other assets include prepaid general and administrative expenses, such as 
insurance and rent.  

F-14 

 
 
 
  
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
   
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
  
 
  
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

5.    Note Receivable 

On June 16, 2010, Amarex, LLC (“Amarex”) executed a note payable to the Company in settlement of a contract 
dispute.    The  Company  settled  the  case  with  Amarex  for  $100,000  less  a  balance  owed  of  $43,953.    The 
principal sum of the note was $56,047, and is included in other income in the Company’s cumulative statement of 
operations.    Monthly  payments  of  $2,335  began  on  September  1,  2010  and  continued  until  August  1,  2012  at 
which time the balance was paid in full.    The note does not bear interest. As of December 31, 2012, the note had 
been paid in full. 

6.    Equipment, Net 

Furniture and fixtures 
Office equipment 
Lab and computer equipment 
Leasehold improvements 

Total fixed assets 
Less: Accumulated depreciation 

December 31,   
2012 

December 31,   
2011 

$ 

  34,200   $ 
  81,074  
  430,261  
  119,841  

  665,376  
  (613,220) 

  34,200  
  81,074  
  430,261  
  119,841  

  665,376  
  (570,834) 

Net carrying amount 

  $ 

  52,156   $ 

  94,542  

Depreciation expense was $42,386 and $45,070 for the years ended December 31, 2012 and 2011, respectively.   

7.  Accounts Payable and Accrued Expenses 

Trade payables 
Accrued expenses 
Accrued research and development contract costs 
Payroll liabilities 

December 31,   
2012 

December 31,   
2011 

$ 

  250,682   $ 
  76,289  
  452,577  
  72,289  

  555,613  
  50,401  
  449,775  
  129,616  

  $ 

  851,837   $ 

  1,185,405  

F-15 

 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

8.    Deferred Research and Development Arrangements 

Rexgene Biotech Co., Ltd. 

In  2003,  the  Company  entered  into  a  collaborative  research  agreement  with  Rexgene  Biotech  Co.,  Ltd. 
(“Rexgene”), a  shareholder.    Rexgene is engaged  in the development  of  pharmaceutical  products in  Asia and 
has agreed to assist the Company with the research, development and clinical trials necessary for registration of 
the Company’s drug candidate, Archexin, in Asia.    This agreement provides Rexgene with exclusive rights to 
license, sublicense, make, have made, use, sell and import Archexin in Asia.    In accordance with the agreement, 
Rexgene paid the Company a one-time fee of $1,500,000 in 2003.    The agreement terminates at the later of 20 
years or the term of the patent.    The amortization reduces research and development expenses for the periods 
presented.     

The  Company  is  using  20  years  as  its  basis  for  recognition  and  accordingly  $75,000  reduced  research  and 
development  expenses  for  the  years  ended  December  31,  2012  and  2011,  respectively.    The  remaining 
$750,000  and  $825,000  at  December  31,  2012  and  December  31,  2011,  respectively,  is  reflected  as  deferred 
research and development arrangement on the balance sheet.    The contribution is being used in the cooperative 
funding of the costs of development of Archexin. Royalties of 3% of net sales of licensed products will become 
payable to the Company on a quarterly basis once commercial sales of Archexin begin in Asia.    The product is 
still under development and commercial sales in Asia are not expected to begin until at least 2014.    Under the 
terms of the agreement, Rexgene does not receive royalties on Company net sales outside of Asia.   

Teva Pharmaceutical Industries, Ltd. 

On  September  21,  2009,  the  Company  closed  on  a  securities  purchase  agreement  with  Teva  Pharmaceutical 
Industries  Limited  (“Teva”),  under  which  Teva  purchased  3,102,837  shares  of  our  common  stock  for  $3.5 
million. Contemporaneous with the execution and delivery of this agreement, the parties executed a research and 
exclusive license option  agreement (“RELO”)  pursuant to  which  the  Company agreed to use  $2,000,000  from 
the gross proceeds of the issuance and sale of shares to Teva to fund a research and development program for the 
pre-clinical development of RX-3117.    On November 27, 2012, the Company and Teva entered into a second 
amendment to the RELO agreement, in which Teva has provided the Company with an additional $926,000 of 
research  funding  for  the  development  of  RX-3117,  which  is  recorded  as  restricted  cash  on  the  Company’s 
balance  sheet.    The  contribution  from  the  second  amendment  is  recorded  as  a  deferred  research  and 
development arrangement on the balance sheet, and costs incurred for the development of RX-3117 reduced the 
deferred  research  and  development  arrangement,  and  are  paid  from  the  restricted  cash.    As  of  December  31, 
2012, the Company had proceeds remaining of $876,000 which is included in deferred research and development 
arrangements on the balance sheet. 

F-16 

 
 
 
  
  
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

9. Other Liabilities 

Deferred Lease Incentive 

On June 29, 2009, the Company entered into a five year office lease agreement as disclosed in Note 15.    The 
lessor  agreed  to  grant  a  leasehold  improvement  allowance  of  $100,000  to  the  Company  to  be  used  for  the 
construction  cost  of  improvements  to  the  leased  property,  which  included  architectural  and  engineering  fees, 
government  agency  plan  check,  permit  and  other  fees,  sales  and  use  taxes,  testing  and  inspection  costs,  and 
telephone and data cabling and wiring in the premises.    The Company accounts for the benefit of the leasehold 
improvement allowance as a reduction of rental expense over the five-year term of the office lease. 

The following table sets forth the deferred lease incentive: 

Deferred lease incentive 
Less accumulated amortization 

December 31,   
2012 

December 31,   
2011 

$ 

  100,000   $ 
  (70,000) 

  100,000  
  (50,000) 

Balance 

  $ 

  30,000   $ 

  50,000  

Deferred Office Lease Expense 

The office lease agreement, disclosed above, requires an initial annual base rent with annual increases over the 
next five years.    The Company recognizes rental expense on a straight-line basis over the term of the lease, 
which resulted in a deferred rent liability of $35,417 and $54,388 as of December 31, 2012 and 2011, 
respectively. 

F-17 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

10.  Common Stock   

The following transactions occurred from March 19, 2001 (inception) to December 31, 2012: 

a)    On May 10, 2001, the Company issued 3,600,000 shares of common stock to the Company’s founders for 

cash of $1. 

b)    On August 10, 2001, the Company issued:   

i) 

1,208,332 shares of common stock to the directors of the Company for cash of $1,450,000. 

ii) 

958,334 shares of common stock to Rexgene for cash of $550,000. 

iii)    360,000 shares of common stock in a private placement to individual investors for cash of $1,080,000. 

These share purchases were negotiated by the parties at various dates prior to the August 10, 2001 share 
issuance date. 

c)    On  October  10,  2001,  the  Company  issued  400,000  shares  of  common  stock  to  Chong  Kun  Dang 
Pharmaceutical Corp. (“CKD”) for cash of $479,991 and 400,000 shares of common stock to an individual 
investor for cash of $479,991. 

d)    On October 10, 2001, the Company issued 200,000 shares of common stock to CKD for cash of $479,985. 

e)    Since inception, the Company’s founders have transferred 800,000 shares of the common stock described in 

a) to officers and directors of the Company. 

f)    In July 2003, the stockholders described in b) (iii) and e) transferred an aggregate of 1,268,332 shares of 
common stock to a voting trust.    The trust allows for the unified voting of the stock by the trustees.     

The  appointed  trustees  are  senior  management  of  the  Company  who,  together  with  their  existing  shares, 
control a majority of the voting power of the Company. 

g)    On August 20, 2003, the Company issued 500,000 shares of common stock to KT&G Corporation for cash 

consideration of $2,000,000. 

h)    On October 29, 2004, an option holder exercised options to purchase shares of common stock for cash of 

$1,800 and the Company issued an aggregate of 1,500 shares. 

i)    Pursuant to the agreement and plan of merger which occurred on May 13, 2005, (i) each share of the issued 
and outstanding common stock of Rexahn, Corp (“Rexahn”) (other than dissenting shares) was converted 
into the right to receive five shares of Rexahn Pharmaceuticals common stock; (ii) each issued, outstanding 
and  unexercised  option  to  purchase  a  share  of  Rexahn  common  stock  was  converted  into  an  option  to 
purchase  five  shares  of  Rexahn  Pharmaceuticals’  common  stock  and  (iii)  the  par  value  of  Rexahn’s 
common stock was adjusted to reflect the par value of Corporate Road Show Com Inc. (“CRS”) common 
stock.  In  the  acquisition  merger,  289,780,000  CRS  pre-reverse  stock  split  shares  were  converted  into 
2,897,802 post-reverse stock split Rexahn Pharmaceuticals shares, and an additional 500,000 post-reverse 
stock  split  Rexahn  Pharmaceuticals  shares  were  issued  to  a  former  executive  of  CRS.    All  shares  and 
earnings per share information have been retroactively restated in these financial statements. 

j)    On August 8, 2005, the Company issued, in a transaction exempt from registration under the Securities Act 

of 1993, as amended, 4,175,000 shares of common stock at a purchase price of $2.00 per share. 

k)    On October 3, 2005, the Company issued 7,000 shares of common stock for $21,877 and $7,500 cash in 

exchange for legal services from W. Rosenstadt and Steve Sanders. 

F-18 

 
 
 
 
 
  
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

l)  On December 2, 2005, the holders of a convertible note that was issued on August 8, 2005 and, represented 
$1,300,000 aggregate principal amount, exercised their option to convert the entire principal amount of the 
note  into  the  Company’s  common  stock.    Based  on  a  $2.00  per  share  conversion  price,  the  holders 
received an aggregate of 650,000 shares.   

m)  On  December  27,  2005,  option  holders  exercised  options  to  purchase  shares  of  the  Company’s  common 

stock for cash of $9,600 and the Company issued an aggregate of 40,000 shares. 

n)    On February 22, 2006, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $1,200 and the Company issued an aggregate of 5,000 shares. 

o)  On April 12, 2006, an option holder exercised options to purchase shares of the Company’s common stock 
for  cash  of  $3,409  and  the  Company  issued  an  aggregate  of  14,205  shares.    On  the  same  date,  the 
Company agreed to repurchase common stock from the option holder based on the then market price for 
treasury in exchange for the aggregate purchase price of $28,410 in cash.     

p)  On May 13, 2006, holders of the $3,850,000 convertible notes issued on February 28, 2005, exercised their 

rights  to  convert  the  entire  principal  amount  of  the  notes  into  shares  of  the  Company’s  common  stock.       
Based  on  a  $1.00  per  share  conversion  price,  the  Company  issued  3,850,000  shares  of  common  stock  in 
connection with the conversion.   

q)  On  October  9,  2006,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s  common 

stock for cash of $2,400 and the Company issued an aggregate of 10,000 shares.     

r)  On November 19, 2006, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $1,800 and the Company issued an aggregate of 7,500 shares. 

s)  On December 19, 2006, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $6,000 and the Company issued an aggregate of 25,000 shares. 

t)  On April 18, 2007, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $14,400 and the Company issued an aggregate of 18,000 shares. 

u)  On July 23, 2007, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $12,000 and the Company issued an aggregate of 15,000 shares. 

v)  On September 27, 2007, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $15,600 and the Company issued an aggregate of 19,500 shares. 

F-19 

 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

w)  On  December  18,  2007,  the  Company  issued  4,857,159  units  at  a  price  $1.40  per  share  for  total  gross 
proceeds  of  $6,800,023.   Investors  also  were  issued  one  warrant  for  every  five  shares  purchased.    One 
warrant will entitle the holder to purchase an additional share of common stock at a purchase price of $1.80 
at  any  time  over  a  period  of  three  years  from  the  date  of  the  closing.  The  Company  has  recorded  the 
warrants as liabilities at fair value as disclosed in Note 12.    Private placement closing costs of $139,675 
were recorded as a reduction of the issuance proceeds.    Private placements costs also consist of 107,144 
warrants,  valued  at  $138,326,  and  were  recorded  as  a  financing  expense.  The  Company  extended 
anti-dilutive protection to the investors. The anti-dilution protection provision is structured in a way that is 
designed  to  protect  a  holder’s  position  from  being  diluted  and  contains  a  price  protection  based  on  a 
mathematical  calculation,  and  is  recorded  as  a  liability  at  fair  value,  as  disclosed  in  Note  13.      The 
Company revalues these liabilities each reporting period, with the unrealized gain (loss) recorded as other 
income (expense). 

A summary of the allocation of the proceeds of the offering is shown below: 

Gross Proceeds: 

$ 

  6,800,023  

Allocated to liabilities: 
          Warrant liabilities 
          Less: Warrants allocated to placement agent 
          Put feature on common stock 
Total allocated to liabilities 

Allocated to equity: 
        Common stock and additional paid-in capital 

  1,392,476  
  (138,326) 
  4,401,169  
  5,655,319  

  1,144,704  

Total allocated gross proceeds: 

  $ 

  6,800,023  

x)  On December 27, 2007, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $18,000 and the Company issued an aggregate of 75,000 shares. 

F-20 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                     
 
 
 
 
 
 
 
 
           
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

y)  On March 20, 2008, the Company issued 642,858 units consisting of one share of the Company’s common 
stock and one warrant for every five common shares purchased in a private placement at a price of $1.40 
per unit for total gross proceeds of $900,001.    One warrant will entitle the holder to purchase an additional 
share  of  common  stock  at  a  price  of  $1.80  at any  time  over  a  period  of  three  years  from  the  date  of the 
private  placement,  and  is  recorded  as  a  liability  at  fair  value.    The  Company  extended  anti-dilution 
protection  to  investors,  and  the  provision  is  structured  in  a  way  that  is  designed  to  protect  the  holder’s 
position from being diluted and contains a price based on a mathematical computation. 

A summary of the allocation of the proceeds of the offering is shown below:   

Gross Proceeds: 

$ 

  900,001  

Allocated to liabilities: 
          Warrant liabilities 
          Put feature on common stock 
Total allocated to liabilities 

Allocated to common stock and additional paid-in capital 

  190,917  
  553,569  
  744,486  

  155,515  

Total allocated gross proceeds: 

$ 

  900,001  

z)  On May 30, 2008, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $7,200 and the Company issued an aggregate of 30,000 shares. 

aa)  On June 2, 2008, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $12,000 and the Company issued an aggregate of 50,000 shares. 

ab)  On June 30, 2008, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $12,000 and the Company issued an aggregate of 10,000 shares. 

F-21 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                     
 
 
 
 
 
 
           
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

ac)  On June 5, 2009 the Company closed on a purchase agreement to issue 2,857,143 shares of common stock 
at a price of $1.05 per share to an institutional investor for total gross proceeds of $3,000,000 and incurred 
$289,090 of stock issuance costs.    The investor was also issued: 

1)  Series I warrants to purchase 2,222,222 shares of common stock at a purchase price of $1.05 per share 

at any time before September 3, 2009; 

2)  Series II warrants to purchase 1,866,666 shares of common stock at a purchase price of $1.25 per share 

at any time from December 3, 2009 to June 5, 2012; and 

3)  Series  III  warrants  to  purchase  1,555,555  shares  of  common  stock  at  a  purchase  price  of  $1.50  per 

share at any time from December 3, 2009 to June 5, 2014. 

The closing costs included 142,857 warrants valued at $122,257 and were recorded as a financing expense. 
All warrants issued from this purchase agreement are recorded as liabilities at fair value. 

The Company incurred a derivative loss upon issuance of these warrants, as the fair value of the warrants at 
inception was greater than the proceeds received from the investor.    The derivative loss was combined with 
unrealized gains (losses) for the year ended December 31, 2009. 

          A summary of the allocation of the proceeds of the offering is shown below:   

Gross Proceeds: 

$ 

  3,000,000  

Allocated to liabilities: 
        Warrant liabilities 
        Less: Warrants allocated to placement agent 
Total allocated to liabilities 

Allocated to equity: 
        Common stock and additional paid-in capital 

Allocated to expense: 
        Derivative loss at inception 

  3,451,194  
  (122,257) 
  3,328,937  

- 

  (328,937) 

Total allocated gross proceeds: 

$ 

  3,000,000  

ad)  On June 9, 2009, the Company issued 1,833,341 shares of common stock and 862,246 warrants to purchase 
common stock at a purchase price of $1.05 per share to existing stockholders pursuant to the anti-dilution 
protection  provisions  of  the  private  placements  transacted  on  December  18,  2007  and  March  20,  2008.   
The fair value of the additional warrants issued was approximately $422,300.       

ae)  On September 4, 2009, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $3,600 and the Company issued an aggregate of 15,000 shares. 

af)  On  September  21,  2009,  the  Company  issued  3,102,837  shares  of  common  stock  at  a  purchase  price  of 
$1.13  per  share  to  an  institutional  investor  for  net  proceeds  of  $3,371,340,  which  includes  $128,659  of 
stock issuance costs. 

F-22 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

ag)  On October 23, 2009, the Company closed on a purchase agreement to issue 6,072,383 shares of common 
stock at a price of $0.82 per share to five institutional investors for gross proceeds of $5,000,000, which 
includes $351,928 of stock issuance costs.    The investors were also issued warrants to purchase 2,125,334 
shares of common stock at a purchase price of $1.00 per share, exercisable on or after the date of delivery 
until  the  five-year  anniversary,  and  were  recorded  as  liabilities  at  fair  value.  The  closing  costs  included 
245,932 warrants valued at $101,693 and were recorded as a financing expense. 

A summary of the allocation of the proceeds of the offering is shown below:   

Gross Proceeds: 

$ 

  5,000,000  

Allocated to liabilities: 
        Warrant liabilities 
        Less: Warrants allocated to placement agent 
Total allocated to liabilities 

Allocated to equity: 
        Common stock and additional paid-in capital 

  1,114,627  
  (101,693) 
  1,012,934  

  3,987,066  

Total allocated gross proceeds: 

  $ 

  5,000,000  

ah)  On  October  23,  2009,  the  Company  issued  2,018,143  shares  of  common  stock  and  569,502  warrants  to 
purchase  common  stock  at  a  purchase  price  of  $0.82  per  share  to  existing  stockholders  pursuant  to 
anti-dilution protection provisions of the private placements transacted on December 24, 2007 and March 
20, 2008. The fair value of the additional warrants issued was approximately $476,200. 

ai)  On  February  12,  2010,  the  Company  entered  into  two  consulting  agreements  pursuant  to  which  the 
Company  issued  300,000  shares  of  common  stock  upon  the  execution  of  the  agreements.    Upon  the 
extension of the term, 200,000 shares of common stock for each month will be issued until the termination 
of services. 

The following table lists the issuances of shares by the Company under the consulting agreement: 

Date of Issuance 
February 12, 2010 
May 24, 2010 
June 15, 2010 
August 2, 2010 
September 21, 2010 
October 21, 2010 
November 11, 2010 

Number of Shares 
Issued 

Market Value 
Per Share   

Total Market Value of 
Share Issuance 

$ 

300,000 
200,000 
200,000 
400,000 
200,000 
200,000 
200,000 

  1.22   $ 
  1.40  
  1.15  
  1.37  
  1.20  
  1.16  
  1.06  

  366,000  
  280,000  
  230,000  
  548,000  
  240,000  
  232,000  
  212,000  

Total 

1,700,000 

  $ 

  2,108,000  

The market value of these shares was recorded as an expense and is reflected in general and administrative 
expenses in the Company’s statement of operations.    The agreements were terminated by the Company on 
November 11, 2010. 

F-23 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

aj) 

In  March  2010,  warrant  holders  exercised  their  warrants  to  purchase  shares  of  the  Company’s  common 
stock for cash of $1,297,001 and the Company issued an aggregate of 1,197,001 shares.     

ak)  In March 2010, option holders exercised options to purchase shares of the Company’s common stock for 

cash of $21,240 and the Company issued an aggregate of 48,000 shares. 

al) 

In April 2010, warrant holders exercised their warrants to purchase shares of the Company’s common stock 
for cash of $1,966,375 and the Company issued an aggregate of 1,595,825 shares.     

am)  On April 20, 2010, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $86,000 and the Company issued an aggregate of 107,500 shares. 

an)  In  May  2010,  warrant  holders  exercised  890,051  cashless  warrants  to  obtain  shares  of  the  Company’s 

common stock and the Company issued an aggregate of 547,674 shares. 

ao)  On June 30, 2010, the Company entered into a purchase agreement to issue 6,666,667 shares of common 
stock at a price of $1.50 per share to investors for gross proceeds of $10,000,000, which includes $681,773 
of stock issuance costs.    The investors were also issued warrants to purchase 2,000,000 shares of common 
stock at an exercise price of $1.90 per share.    The warrants became immediately exercisable on the date of 
delivery until the four-year anniversary of the date of issuance.    These warrants were valued at $1,800,800 
and recorded as warrant liabilities.    The closing costs included 200,000 warrants valued at $180,080 and 
were recorded as a financing expense.     

Gross Proceeds: 

$ 

  10,000,000  

Allocated to liabilities: 
        Warrant liabilities 
        Less: Warrants allocated to placement agent 
Total allocated to liabilities 

Allocated to equity: 
        Common stock and additional paid-in capital 

  1,980,880  
  (180,080) 
  1,800,800  

  8,199,200  

Total allocated gross proceeds: 

  $ 

  10,000,000  

ap)    In November 2010, warrant holders exercised 936,883 cashless warrants to obtain shares of the Company’s 

common stock and the Company issued an aggregate of 247,491 shares. 

aq)    In December 2010, warrant holders exercised 530,900 cashless warrants to obtain shares of the Company’s 

common stock and the Company issued an aggregate of 126,195 shares. 

ar)  On January 19, 2011, the Company issued 2,334,515 shares of common stock at a purchase price of $1.69 
per  share  to  an  institutional  investor  for  net  proceeds  of  $3,926,397,  which  includes  $23,603  of  stock 
issuance costs.   

as)  On February 15, 2011, a warrant holder exercised warrants to purchase shares of the Company’s common 

stock for cash of $215,104 and the Company issued 209,042 shares. 

at)  On February 28, 2011, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $6,000 and the Company issued 25,000 shares. 

au)  On March 11, 2011, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $12,000 and the Company issued 50,000 shares. 

av)  On March 28, 2011, warrant holders exercised their warrants to purchase shares of the Company’s common 

stock for cash of $102,857 and the Company issued 124,917 shares. 

F-24 

 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

aw)  On March 31, 2011, the Company closed on a purchase agreement to issue 8,333,333 shares of common 
stock at a price of $1.20 per share to five institutional investors for gross proceeds of $10,000,000, which 
includes  $706,124  of  cash  stock  issuance  costs.    The  investors  were  also  issued  warrants  to  purchase 
3,333,333 shares of common stock at a purchase price of $1.50 per share, exercisable on or after six months 
after  the  closing  date  until  the  five-year  anniversary  of  the  initial  exercise  date.    These  warrants  were 
recorded as liabilities with a fair value of $2,826,666. The closing costs included 208,333 warrants valued 
at $97,667 and were recorded as a financing expense. 

A summary of the allocation of the proceeds of the offering is shown below:   

Gross Proceeds: 

$ 

  10,000,000  

Allocated to liabilities: 
        Warrant liabilities 
        Less: Warrants allocated to placement agent 
Total allocated to liabilities 

Allocated to equity: 
        Common stock and additional paid-in capital 

  2,924,333  
  (97,667) 
  2,826,666  

  7,173,334  

Total allocated gross proceeds: 

  $ 

  10,000,000  

ax)  In September 2011, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $22,040 and the Company issued 28,000 shares. 

ay)  In October 2011, an option holder exercised options to purchase shares of the Company’s common stock 

for cash of $19,200 and the Company issued 80,000 shares. 

F-25 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

az)    On December 4, 2012 the Company closed on an underwritten public offering to issue and sell 19,130,435 
shares  of  common  stock  and  common  stock  purchase  warrants  to  purchase  up  to  10,521,739  shares  of 
common  stock.    The  common  stock  and  warrants  were  sold  in  units,  consisting  of  common  stock  and  a 
warrant to purchase 0.55 shares of common stock, at a price of $0.33 per share, and the warrants have an 
exercise  price  of  $0.472  per  share.    Pursuant  to  the  underwriting  agreement,  the  Company  granted  the 
Underwriters a 45-day option to purchase an additional 2,869,565 shares of Common Stock and warrants to 
purchase 1,578,261 shares of Common Stock.    On December 4, 2012, the underwriters partially exercised 
this  option,  and  869,565  units,  consisting  of  869,565  shares  and  478,261  warrants  were  issued.    On 
December  10,  2012,  the  underwriters  exercised  the  remaining  overallotment  option,  and  the  Company 
issued 2,000,000 units, consisting of 2,000,000 shares and 1,100,000 warrants.    The total gross proceeds of 
the offering was $7,260,000.    The warrants issued are exercisable on the closing date until the five-year 
anniversary of the closing date, and were recorded as liabilities at fair value. 

The  closing  costs  of  $977,434  included  880,000  warrants  valued  at  $163,096,  and  $814,338  for 
underwriter’s discounts and professional and other fees.      Based upon the estimated fair value of the stock 
and  warrants  in  the  units,  the  Company  allocated  $332,108  to  financing  expense,  and  $645,326  as  stock 
issuance costs. 

A summary of the allocation of the proceeds of the offering is shown below: 

Gross Proceeds: 

$ 

  7,260,000  

Allocated to liabilities: 
        Warrant liabilities 
        Less: Warrants allocated to placement agent 
Total allocated to liabilities 

Allocated to equity: 
        Common stock and additional paid-in capital 

Total allocated gross proceeds: 

  2,637,216  
  (163,096) 
  2,474,120  

  4,785,880  

  $ 

  7,260,000  

ba)    On December 7, 2012, the Company issued 2,083,333, shares of common stock at a purchase price of $0.36 
per  share to  an institutional  investor for  gross  proceeds  of  $750,000. The  total stock  issuance  costs  were 
$63,658. 

F-26 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

11. Stock-Based Compensation 

On August 5, 2003, the Company established a stock option plan (the “Plan”).    Under the Plan, the Company 
grants  stock  options  to  key  employees,  directors  and  consultants  of  the  Company.    For  all  grants  prior  to 
September  12,  2005  and  grants  to  employees  of  the  Company  after  September  12,  2005,  the  vesting  period  is 
30% on the first anniversary of the grant date, an additional 30% on the second anniversary and the remaining 
40% on the third anniversary.    Options expire between five and ten years from the date of grant. 

For grants to non-employee consultants of the Company after September 12, 2005, the vesting period is between 
one to three years, subject to the fulfillment of certain conditions in the individual stock option grant agreements, 
or  100%  upon  the  occurrence  of  certain  events  specified  in  the  individual  stock  option  grant  agreements.   
Options authorized for issuance under the Plan total 17,000,000 after giving effect to an amendment to the Plan 
approved at the Annual Meeting of the Stockholders of the Company on June 2, 2006.    At December 31, 2012, 
8,578,000 shares of common stock were available for issuance. 

Prior  to  adoption  of  the  Plan,  the  Company  made  restricted  stock  grants.    During  2003  all  existing  restricted 
stock grants were converted to stock options.    The converted options maintained the same full vesting period as 
the original restricted stock grants. 

Accounting for Employee Awards 

The  Company’s  results  of  operations  for  the  years  ended  December  31,  2012  and  2011  include  share-based 
employee  compensation  expense  totaling  $202,037  and  $597,637  respectively.      Such  amounts  have  been 
included  in  the  statement  of  operations  in  general  and  administrative  and  research  and  development  expenses.   
No  income  tax  benefit  has  been  recognized  in  the  statement  of  operations  for  share-based  compensation 
arrangements as the Company has provided for a 100% valuation allowance on its deferred tax assets. 

Employee  stock  option  compensation  expense  is  the  estimated  fair  value  of  options  granted  amortized  on  a 
straight-line basis over the requisite vesting service period for the entire portion of the award.   

Accounting for Non-Employee Awards 

Stock  compensation  expenses  related  to  non-employee  options  were  $28,950  and  $40,970  for  the  years  ended 
December 31, 2012 and 2011, respectively.    Such amounts have been included in the statement of operations in 
general and administrative and research and development expenses. 

F-27 

 
 
   
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

Summary of Stock Compensation Expense Recognized 

Total stock-based compensation recognized by the Company in the years ended December 31, 2012 and 2011, 
and the period from inception (March 19, 2001) to December 31, 2012 is as follows: 

Year Ended December 31, 
2011 
2012 

      Cumulative from 
March 19, 2001 
(Inception) to 

  December 31, 2012 

Statement of operations line item:   
General and administrative: 

Payroll 

$ 

  126,029   $ 

  501,884   $ 

  2,621,429  

Consulting and other professional 
fees 

Research and development: 

Payroll 

Consulting and other professional 
fees 

  23,932  

  76,008  

  5,018  

  26,566  

  810,455  

  95,753  

  1,048,057  

  14,404  

  1,328,675  

Total 

$ 

  230,987   $ 

  638,607   $ 

  5,808,616  

Summary of Stock Option Transactions 

There were 170,000 stock options granted at an exercise price of $0.38 with a fair value of $47,589 and 75,000 
stock options granted at an exercise price of $0.48 with a fair value of $26,835 during the year ended December 
31, 2012.    There were 130,000 stock options granted at an exercise price of $1.84 and a fair value of $180,326, 
100,000  stock  options  granted  at  an  exercise  price  of  $1.25  and  a  fair  value  of  $91,334,  20,000  stock  options 
granted at an exercise price of $1.22 and a fair value of $17,915, 150,000 stock options granted at an exercise 
price of $1.12 and a fair value of $121,595, and 50,000 stock options granted at an exercise price of $0.38 and a 
fair value of $14,150 during the year ended December 31, 2011.   

The fair value of options at the date of grant was estimated using the Black-Scholes option pricing model.    The 
Company took into consideration guidance under ASC 718, “Compensation-Stock Compensation” and SAB 107 
when  reviewing  and  updating  assumptions.    The  expected  volatility  is  based  upon  historical  volatility  of  the 
Company’s stock.    The expected term is based upon the simplified method as allowed under SAB 107. 

F-28 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

The assumptions made in calculating the fair values of options are as follows:   

Black-Scholes weighted average assumptions 

Expected dividend yield 
Expected volatility 
Risk free interest rate 
Expected term (in years) 

Year Ended December 31,   
2011 
2012 

0 % 
98-101 % 
0.62-0.89 % 
5 years  

0 % 
96-101 % 
0.11-2.29 % 
5 years  

The following table summarizes the employee and non-employee share-based transactions: 

2012 

2011 

Number of 
Options 

Weighted 
Average Exercise 
Price 

Number of Options 

Weighted Average 
Exercise    Price 

Outstanding at 
January 1 
Granted 
Exercised 
Cancelled 

  7,646,795   $ 
  245,000  
- 
  (150,000) 

  1.05  
  0.41  
- 
  1.15  

  8,076,795   $ 
  450,000  
  (183,000) 
  (697,000) 

Outstanding at December 31 

  7,741,795   $ 

  1.03  

  7,646,795   $ 

The following table summarizes information about stock options outstanding as of December 31, 2012 and 
December 31, 2011. 

  1.01  
  1.28  
  0.32  
  0.91  

  1.05  

Outstanding at 
December 31, 2012 

Exercisable at 
December 31, 2012 

Outstanding at 
December 31, 2011 

Exercisable at 
December 31, 2011 

Number of 
Options 

Weighted 
Average 
Exercise Price 

Weighted 
Average 
Remaining 
Contractual 
Term 

Aggregate 
Intrinsic Value 

  7,741,795  $ 

  1.03 

3.9 years $ 

  41,706 

  7,176,795  $ 

  1.04 

3.5 years $ 

  41,706 

  7,646,795  $ 

  1.05 

4.8 years $ 

  83,611 

  6,911,795  $ 

  1.02 

4.4 years $ 

  83,611 

The total intrinsic value of the options exercised was $163,450 for year ended December 31, 2011.    There were 
no options exercised during the year ended December 31, 2012.    The weighted average fair value of the options 
vested was $0.92 and $0.70 for the year ended December 31, 2012 and 2011, respectively.   

F-29 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
  
 
 
 
 
 
   
 
 
 
 
  
 
 
 
 
 
   
 
 
 
 
  
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

A  summary  of  the  Company’s  unvested  shares  as  of  December  31,  2012  and  changes  during  the  year  ended 
December 31, 2012 is presented below: 

2012 

Unvested at January 1, 2012 
Granted 
Vested 
Cancelled 

Weighted Average Fair Value at 
Grant Date 

Number of    Options 
  735,000 
$ 
  245,000 
$ 
  (304,000)  $ 
  (111,000)  $ 

  0.92 
  0.30 
  0.92 
  0.89 

  0.66 

Unvested at December 31, 2012 

  565,000 

$ 

As of December 31, 2012 and 2011, there was $172,532 and $397,593 of total unrecognized compensation cost, 
respectively, related to all unvested stock options, which is expected to be recognized over a weighted average 
vesting period of 1.0 years and 1.6 years, respectively.     

12. Warrants   

As  of  December  31,  2012,  warrants  to  purchase  21,656,142  shares  were  outstanding,  having  exercise  prices 
ranging from $0.41 to $1.90 and expiration dates ranging from August 8, 2013 to December 4, 2017.       

Balance, January 1 
Issued during the period 
Exercised during the period 
Expired during the period 

Number of 
warrants 
  8,676,142  
  12,980,000  
                    - 
                    - 

2012 

2011 

Weighted average 
exercise price 

Number of 
warrants 

Weighted average 
exercise price 

$ 

  1.53  
  0.47  
                  - 
                  - 

  5,624,583  
  3,541,666  
  (333,959) 
  (156,148) 

$ 
$ 
$ 
$ 

$ 

  1.48  
  1.50  
  0.95 
  0.82 

  1.53  

Balance, December 31 

  21,656,142  

$ 

  0.89  

  8,676,142  

At December 31, 2012 and 2011, the average remaining contractual life of the outstanding warrants was 3.8 and 
3.2 years, respectively   

The warrants, which were issued to investors in the December 2007, March 2008, May 2009, October 2009, June 
2010,  March  2011  and  December  2012  offerings,  contain  a  provision  for  net  cash  settlement  in  the  event  that 
there is a fundamental transaction (contractually defined as a merger, sale of substantially all assets, tender offer, 
or share exchange).      If a fundamental transaction occurs in which the consideration issued consists principally 
of cash or stock in a non-public company, then the warrant holder has the option to receive cash, equal to the fair 
value  of  the  remaining  unexercised  portion  of  the  warrant.    Due  to  this  contingent  redemption  provision,  the 
warrants require liability classification in accordance with ASC 480 and are recorded at fair value.    In addition, 
the  warrants  issued  in  the  May  2009,  October  2009,  June  2010,  March,  2011  and  December  2012  offerings 
contain  a  cashless  exercise  provision  that  is  exercisable  only  in  the  event  that  a  registration  statement  is  not 
effective, which provision may not be operative if an effective registration statement is not available because of 
an exemption under the U.S. Securities laws may not be available to issue unregistered shares.    As a result, net 
cash settlement may be required. 

F-30 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

ASC 820 provides requirements for disclosure of liabilities that are measured at fair value on a recurring basis in 
periods subsequent to the initial recognition.    Fair values for warrants are determined using the Binomial Lattice 
(“Lattice”)  valuation  technique.  The  Lattice  model  provides  for  dynamic  assumptions  regarding  volatility  and 
risk-free interest rates within the total period to maturity. Accordingly, within the contractual term, the Company 
provided  multiple  date  intervals  over  which  multiple  volatilities  and  risk  free  interest  rates  were  used.  These 
intervals allow the Lattice model to project outcomes along specific paths which consider volatilities and risk free 
rates that would be more likely in an early exercise scenario.   

Significant assumptions are determined as follows:   
Trading market values—published trading market values;   
Exercise price—Stated exercise price;   
Term—remaining contractual term of the warrant;   
Volatility—Historical trading volatility for periods consistent with the remaining terms;   
Risk-free rate—Yields on zero coupon government securities with remaining terms consistent with the remaining 
terms of the warrants.   

Due  to  the  fundamental  transaction  provision,  which  could  provide  for  early  redemption  of  the  warrants,  the 
model  also  considered  the  probability  the  Company  would  enter  into  a  fundamental  transaction  during  the 
remaining  term  of  the  warrant.  Since  the  Company  is  still  in  its  development  stage  and  is  not  yet  achieving 
positive cash flow, management believes the probability of a fundamental transaction occurring over the term of 
the  warrant  is  unlikely  and  therefore  estimates  the  probability  of  entering  into  a  fundamental  transaction to  be 
5%.    For valuation purposes, the Company also assumed that if such a transaction did occur, it was more likely 
to occur towards the end of the term of the warrants. 

The  warrants  issued  in  December  2007  and  March  2008  are  not  only  subject  to  traditional  anti-dilution 
protection, such as stock splits and dividends, but they are also subject to down-round anti-dilution protection. 
Accordingly,  if  the  Company  sells  common  stock  or  common  stock  indexed  financial  instruments  below  the 
stated exercise price, the exercise price related to these warrants will adjust to that lower amount.    The Lattice 
model  used 
to  value  the  warrants  with  down-round  anti-dilution  protection  provides  for  multiple, 
probability-weighted  scenarios  at  the  stated  exercise  price  and  at  five  additional  decrements/scenarios  on  each 
valuation date in order to encompass the value of the anti-dilution provisions in the estimate of fair value of the 
warrants. Calculations were performed at the stated exercise price and at five additional decrements/scenarios on 
each valuation date. The calculations provide for multiple, probability-weighted scenarios reflecting decrements 
that  result  from  declines  in  the  market  prices.  Decrements  are  predicated  on  the  trading  market  prices  in 
decreasing  ranges  below  the  contractual  exercise  price.  For  each  valuation  date,  multiple  Binomial  Lattice 
calculations were performed which were probability weighted by considering both the Company’s (i) historical 
market  pricing  trends,  and  (ii)  an  outlook  for  whether  or  not  the  Company  may  need  to  issue  equity  or 
equity-indexed instruments in the future with a price less than the current exercise price. 

The significant  unobservable  inputs  used in  the  fair  value  measurement  of  the  warrants include  management’s 
estimate  of  the  probability  that  a  fundamental  transaction  may  occur  in  the  future.    Significant  increases 
(decreases) in the probability of occurrence would result in a significantly higher (lower) fair value measurement. 

F-31 

 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

The following table summarizes the fair value of the warrants as of the respective balance sheet or transaction 
dates: 

Fair Value as of:   

Warrant Issuance: 
December 18, 2007 financing   
March 20, 2008 financing 
June 5, 2009 financing: 
          Series I warrants 
          Series II warrants 
          Series III warrants 
          Warrants to placement agent 
October 23, 2009 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
June 30, 2010 financing 
          Warrants to institutional investors 
          Warrants to placement agent 
March 31, 2011 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
December 4, 2012 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
Total: 

December 31, 2012  December 31, 2011  Transaction Date 
  1,392,476  
$ 
  190,917  

$ 
  -             
- 

$ 
    -             

- 

- 
- 
  35,311  
  3,489  

  73,454  
  41  

  12,200  
  20  

- 
- 
  89,756  
  8,893  

  707,111  
  1,315,626  
  1,306,200  
  122,257  

  129,221  
  714  

  1,012,934  
  101,693  

  89,800  
  2,320  

  1,800,800  
  180,080  

  306,333  
  83  

  544,000  
  4,021  

  2,826,666  
97,667 

  2,263,910  
  147,224  
  2,842,065  $ 

  $ 

  - 
  - 

  868,725   $ 

  2,474,120  
  163,096  
  13,691,643  

F-32 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

The following table summarizes the number of shares indexed to the warrants as of the respective balance sheet 
or transaction dates: 

Warrant Issuance 
December 18, 2007 financing   
March 20, 2008 financing 
June 5, 2009 financing: 
          Series I warrants 
          Series II warrants 
          Series III warrants 
          Warrants to placement agent 
October 23, 2009 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
June 30, 2010 financing 
          Warrants to institutional investors 
          Warrants to placement agent 
March 31, 2011 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
December 4, 2012 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
Total: 

Number of Shares indexed as of: 

December 31, 2012 December 31, 2011  Transaction Date 

                      -             
                      -             

                      -             
                      -             

  1,078,579  
  128,572  

- 
- 
  1,555,555  
  132,143  

  1,228,333  
  18,445  

  2,000,000  
  200,000  

  3,333,333  
  208,333  

  12,100,000  
  880,000  
21,656,142 

- 
- 
  1,555,555  
  132,143  

  1,228,333  
  18,445  

  2,000,000  
  200,000  

  3,333,333  
  208,333  

  - 
  - 
8,676,142 

  2,222,222  
  1,866,666  
  1,555,555  
  142,857  

  2,125,334  
  245,932  

  2,000,000  
  200,000  

  3,333,333  
  208,333  

  12,100,000  
  880,000  
28,087,383 

The assumptions used in calculating the fair values of the warrants are as follows:   

December 18, 2007 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 
Estimated additional shares to be 
issued upon dilutive event 

December 31, 
2012 

December 31, 
2011 

Transaction Date 

$ 

  -  
-  
-  
-  
-  
-  

-  

$ 

  -  
-  
-  
-  
-  
-  

-  

  1.75   
  143  % 

-  

  3.27  % 
  106  % 
  3.26  % 

98,838 

$ 

F-33 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

$ 

March 20, 2008 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 
Estimated additional shares to be                                           
issued upon dilutive event 

December 31, 
2012 

December 31, 
2011 

Transaction Date 

$ 

    -  
-  
-  
-  
-  
-  

-  

$ 

  -  
-  
-  
-  
-  
-  

-  

  2.14   
  142  % 

-  

  1.95  % 
  97  % 
  1.31  % 

7,479 

June 5, 2009 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

October 23, 2009 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

June 30, 2010 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

$ 

$ 

$ 

December 31, 
2012 

December 31, 
2011 

Transaction Date 

$ 
  0.31   
  100  %   
-  
  0.16  %   
  92  %   
  0.11  %   

  0.38   
98-100 % 

$ 

-  

  0.38  % 
80-81 % 
  0.14  % 

  1.14   
  100  % 

-  

0.63-4.31 % 
103-117 % 
0.20-1.44 % 

December 31, 
2012 

December 31, 
2011 

Transaction Date 

$ 

  0.31   
  100  % 
-  

0.16-0.34 % 
74-93 % 
0.06-0.13 % 

  0.38   
$ 
98-100 %   
-  

0.38-0.58 %   
72-81 %   
0.08-0.16 %   

  0.69   
  100  % 

-  

2.63-3.80 % 
98-99 % 
0.93-1.16 % 

December 31, 
2012 

December 31, 
2011 

Transaction Date 

$ 

  0.31   
  100  % 
-  

0.16-0.34 % 
74-75 % 
0.06 % 

  0.38   
$ 
86-100 %   
-  

0.38-0.58 %   
72-79 %   
0.08-0.14 %   

  1.43   
  100  % 

-  

  1.78  % 
  98  % 
  0.59  % 

F-34 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

March 31, 2011 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

December 4, 2012 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

December 31, 
2012 

December 31, 
2011 

Transaction Date 

$ 

  0.31   
93-100 % 

$ 

-  

0.16-0.58 % 
74-89 % 
0.06-0.23 % 

  0.38   
$ 
87-100 %   
-  

0.38-1.54 %   
72-90 %   
0.08-0.28 %   

  1.18   
  100  % 

-  

1.32-3.64 % 
79-96 % 
0.39-1.09 % 

December 31, 
2012 

December 31, 
2011 

$ 

$ 
  0.31   
85-100 %   

-  

0.58-1.26 %   
88 %   
0.21-0.32 %   

-  
-  
-  
-  
-  
-  

Transaction Date 

$ 

0.30-0.33  

  100  % 

-  

0.52-1.065 % 
88-90 % 
0.22-0.31 % 

Changes in the fair value of the warrant liabilities, carried at fair value, as reported as “unrealized gain on fair 
value of warrants” in the statement of operations: 

December 18, 2007 financing   
March 20, 2008 financing 
June 5, 2009 financing: 
          Series I warrants 
          Series II warrants 
          Series III warrants 
          Warrants to placement agent 
          Derivative loss at inception 
October 23, 2009 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
June 30, 2010 financing 
          Warrants to institutional investors 
          Warrants to placement agent 
March 31, 2011 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
December 4, 2012 financing:   
          Warrants to institutional investors 
          Warrants to placement agent 
Total: 

Year Ended 
December 31, 2011 

Cumulative from 
March 19, 2001 
(Inception) to 
December 31, 2012 
  50,722  
  160,063  

    - $ 

  92,704   

-  
-  
  661,266   
  60,139   
-  

  565,156   
  (102,487)  

  1,017,000   
  108,360   

  2,282,666   
  93,646   

  4,778,450  $ 

  707,111  
  (2,191,175) 
  1,270,889  
  104,388  
  (328,937) 

  (109,760) 
  (135,979) 

  1,788,600  
  180,060  

  2,520,333  
  97,584  

  210,210  
  15,872  
  4,339,981  

Year Ended 
December 31, 2012 
$ 

  - $ 
-  

-  
-  
  54,445   
  5,404   
-  

  55,767   
  673   

  77,600   
  2,300   

  237,667   
  3,938   

  210,210   
  15,872   
  663,876  $ 

 $ 

F-35 

 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
  
  
  
  
  
  
  
  
 
  
  
  
  
  
 
  
  
  
  
  
 
  
  
  
  
  
 
  
  
  
  
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

13. Put feature on Common Stock   

The Anti-dilution provision extended in the December 2007 and March 2008 financings is a financial instrument 
separate and apart from the share. It is a freestanding written put (a put on the Company’s common stock).    As an 
enterprise value put, the contracts’ value moves inversely with the value of the underlying common stock which, 
under ASC 480, is not consistent with the general concepts or criterion for equity classified financial instruments. 
Accordingly, the written put was required to be classified as a liability under ASC 480 and recorded at fair value 
each  reporting  period,  while  the  common  stock  achieved  equity  classification.  Changes  in  the  fair  value  of  the 
anti-dilution make-whole provision are reported as “unrealized gain on fair value of put feature on common stock.” 

The  anti-dilution  make-whole  provisions  associated  with 
the  common  stock,  were  valued  using  a 
probability-weighting  of  put  values provided by  the Lattice  model.    Additional  value  would result from  the  put 
upon an increase in the exercise price or upon decrease of the trading market price in the future. Since the exercise 
price is based on the actual sales price of the stock issued, it is not subject to adjustment unless there is an actual 
dilutive event. Therefore, the mechanism for determining the value of the put was to adjust the stock price input 
into the Lattice model based on the Company’s estimated future stock price.    A Random Walk Brownian Motion 
Stochastic  Process  (“Brownian”)  technique  was  used  to  estimate  the  market  price  at  several  points  in  the  future 
(e.g.  at inception,  6  months,  12  months,  18  months and  24  months)  over the  term  of  the  put to  determine if the 
stock  price  will  be  expected  to  decrease  over  the  related  interval  of  time.  Brownian  is  a  continuous  stochastic 
process  that  is  widely  used  in  financing  for  modeling  random  behavior  that  evolves  over  time,  and  a  stochastic 
process is a sequence of events or paths generated by probabilistic laws. At each interval, the Brownian technique 
was run and the simulation returned the mean stock price (the “expected stock price”).   

Expected stock prices returned from the stochastic model were then input into the Lattice model to provide a put 
value at each of the expected prices and these values were probability weighted to determine the overall fair value 
of  the  anti-dilution  make-whole  provision.  The  term  was  based  on  the  remaining  term  of  the  put  (two  years  at 
inception) and the inputs for volatility and interest rate were based on projected volatility and interest rate in the 
future over the remaining term. 

  The following table summarizes the fair value of the Anti-dilution provision recorded at fair value as liabilities: 

Fair Values: 
December 18, 2007 financing 
March 20, 2008 financing 
Total: 

December 31, 2012  December 31, 2011 

Transaction Date 

$ 

  $ 

  -           $ 

                      -               

  -           $ 

  -           $ 
                      -           
  -           $ 

  4,401,169  
  553,569  
  4,954,738  

The following table summarizes the number of shares indexed to the Anti-dilution provision at the respective 
balance sheet or transaction dates: 

Number of Shares indexed: 
December 18, 2007 financing 
March 20, 2008 financing 
Total: 

December 31, 2012  December 31, 2011  Transaction Date 

                      -               
                      -               
                    - 

                      -           
                      -           
                      - 

  4,857,159  
  642,858  
  5,500,017  

F-36 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

The following table reflects the fair values of the common stock anti-dilution make-whole provisions recorded as 
liabilities and significant assumptions used in the valuation: 

December 18, 2007 financing: 
Trading market prices 
Estimated future stock price 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 

March 20, 2008 financing: 
Trading market prices 
Estimated future stock price 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 

 $ 

 $ 

December 31, 2012  December 31, 2011  Transaction Date 

  - $ 
            -  
-  
-  
-  

  - $ 

                -  
-  
-  
-  

  1.75  
$0.98-$1.75 
143% 
- 
3.14% 

December 31, 2012  December 31, 2011  Transaction Date 

  - $ 
            -  
-  
-  
-  

  - $ 

                -  
-  
-  
-  

  2.14  
$1.36-$2.10 
142% 
- 
1.85% 

Since the Anti-dilution provisions expired on December 18, 2009 and March 20, 2010, there is no liability as of 
December 31, 2012, or no changes in the fair value for the years ended December 31, 2012 and 2011. 

Changes in the fair value of the Anti-dilution provision, carried at fair value, as reported as “unrealized gain on 
fair value of put feature on common stock” in the statement of operations: 

Year Ended 
December 31, 2012 
$ 

Year Ended   
December 31, 2011 

  -         $ 
                        -          
  -         $ 

  -         $ 
                      -          
  -         $ 

  $ 

Cumulative from 
March 19, 2001 
(Inception) to 
December 31, 2012 
  2,148,418  
  167,121  
  2,315,539  

December 18, 2007 financing 
March 20, 2008 financing 
Total: 

14. Income Taxes 

No provision for Federal and State income taxes was required for the years ended December 31, 2012 and 2011 
due to the Company’s operating losses and increased deferred tax asset valuation allowance.    At December 31, 
2012  and  2011,  the  Company  has  unused  net  operating  loss  carry-forwards  of  approximately  $61,780,000  and 
$55,394,000  which  expire  at  various  dates  through  2032.    Some  of  this  amount  may  be  subject  to  annual 
limitations under certain provisions of the Internal Revenue Code related to “changes in ownership.”     

As  of  December 31,  2012 and  2011, the  deferred  tax  assets  related to the  aforementioned carry-forwards have 
been fully offset by valuation allowances, since significant utilization of such amounts is not presently expected 
in the foreseeable future.     

F-37 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

Deferred tax assets and valuation allowances consist of: 

Net Operating Loss Carryforwards 
Stock Option Expense 
Book tax differences on assets and liabilities 
Valuation Allowance 

Net Deferred Tax Assets 

December 31,   
2012 

December 31,   
2011 

$ 

 $ 

  24,094,200  $ 
  1,843,000   
  352,500   
  (26,289,700)  

  21,603,700  
  1,753,400  
  348,600  
  (23,705,700) 

  - $ 

  - 

The Company files income tax returns in the U.S. Federal and Maryland state jurisdictions.   Tax years for fiscal 
2009 through 2012 are open and potentially subject to examination by the Federal and Maryland state taxing 
authorities. 

15.  Commitments and Contingencies 

a)  The  Company  has  contracted  with  various  vendors  to  provide  research  and  development  services.  The 
terms of these agreements usually require an initial fee and monthly or periodic payments over the term of 
the agreement, ranging from 2 months to 36 months. The costs to be incurred are estimated and are subject 
to revision. As of December 31, 2012, the total estimated cost to be incurred under these agreements was 
approximately  $19,705,682  and  the  Company  had  made  payments  totaling  $17,875,371  since  inception 
under  the  terms  of  the  agreements.    All  of  these  agreements  may  be  terminated  by  either  party  upon 
appropriate notice as stipulated in the respective agreements. 

b)  The Company and three of its key executives entered into employment agreements, which were amended 
on  September  9,  2010  and  will  expire  on  September  9,  2013.    The  agreements  result  in  annual 
commitments for each key executive of $350,000, $250,000 and $200,000, respectively.     

c)  On  June  22,  2009,  the  Company  entered  into  a  License  Agreement  with  Korea  Research  Institute  of 
Chemical  Technology  (“KRICT”)  to  acquire  the  rights  to  all  intellectual  properties  related  to 
Quinoxaline-Piperazine derivatives that were synthesized under a Joint Research Agreement.    The initial 
license fee was $100,000, all of which was paid as of December 31, 2009.    The agreement with KRICT 
calls  for  a  one-time  milestone  payment  of  $1,000,000  within  30  days  after  the  first  achievement  of 
marketing approval of the first commercial product arising out of or in connection with the use of KRICT’s 
intellectual properties.    As of December 31, 2012, the milestone has not occurred. 

d)  On  June  29,  2009,  the  Company  signed  a five  year commercial  lease  agreement  for  5,466  square feet  of 
office space in Rockville, Maryland commencing on June 29, 2009.    The lease agreement requires annual 
base  rent  with  increases  over  the  next  five  years.    Under  the  lease  agreement,  the  Company  pays  its 
allocable portion of real estate taxes and common area operating charges. Rent paid under the Company’s 
lease during the years ended December 31, 2012 and 2011 was $158,835 and $148,593, respectively.   

Future rental payments over the next five years and thereafter are as follows: 

2013 
2014 
Total 

162,806 
82,408 
245,214 

$ 

F-38 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
  
 
 
 
  
  
 
  
 
 
 
 
 
 
 
 
 
  
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

In connection with the lease agreement, the Company issued a letter of credit of $100,000 in favor of the 
lessor.    The  Company  has  restricted  cash  equivalents  of  the  same  amount  for  the  letter  of  credit.    On 
August  2,  2010,  and  July  1,  2011  the  letter  of  credit  was  amended  and  reduced  to  $50,000  and  $37,500, 
respectively. 

e)  On September 21, 2009, the Company closed on a securities purchase agreement with Teva, under which 
Teva  purchased  3,102,837  shares  of  our  common  stock  for  $3.5  million.  Contemporaneous  with  the 
execution  and  delivery  of  this  agreement,  the  parties  executed  a  RELO  pursuant  to  which  the  Company 
agreed  to  use  $2,000,000  from  the  gross  proceeds  of  the  issuance  and  sale  of  shares  to  Teva  to  fund  a 
research and development program  for  the  pre-clinical  development  of  RX-3117.    On January  19,  2011, 
the  Company  entered  into  a  second  amendment  to  the  securities  purchase  agreement  (the  “Second 
Amendment”) in which Teva purchased 2,334,515 shares of the common stock of the Company for gross 
proceeds  of  $3,950,000,  which  the  Company  agreed  to  use  for  the  further  preclinical  development  of 
RX-3117.    On December 7, 2012, the Teva exercised its option to purchase $750,000 of common stock, 
and the Company issued Teva 2,083,333 shares.    This constituted the third and final closing agreed to in 
the  securities  purchase  agreement,  and  the  use  of  these  funds  is  not  restricted  by  the  Company.  On 
December 27, 2012 the Company received funds from Teva in accordance with a second amendment to the 
RELO agreement, entered into on November 27, 2012 in which Teva has provided the Company with an 
additional  $926,000  of  research  funding  restricted  for  the  development  of  RX-3117.    The  Company  did 
not issue equity for this transaction.     

The table below summarizes the investments made under the securities purchase agreement and RELO: 

Date of Investment 

Investment 
Amount 

  Shares Issued 

Proceeds 
Remaining in 
Restricted 
Cash as of 
12/31/12 

Deferred 
Research and 
Development 
Arrangement 
Balance at 
12/31/12 

9/21/2009 
1/19/2011 
12/7/2012 
12/27/2012 
Total 

$ 

$ 

3,500,000  
3,950,000  
750,000  
926,000  
9,126,000  

3,102,837 $ 
2,334,515  
2,083,333  
  -  
7,520,685 $ 

  - $ 
  178,301   
  -  
876,000  
1,054,301 $ 

  - 
  - 
  - 
  876,000  
876,000 

f)  The Company has a 401(k) plan established for its employees.    The Company elected to match 100% of 
the  first  3%  of  the  employee’s  compensation  plus  50%  of  an  additional  2%  of  the  employee’s  deferral. 
Expense  related  to  this  matching  contribution  aggregated  $65,686  and  $66,162  for  the  year  ended 
December 31, 2012, and 2011, respectively.   

g)  On May 30, 2012 and June 22, 2011, the Company signed a one year renewal to use lab space commencing 
on  July  1,  2012  and  2011,  respectively.    The  lease  requires  monthly  rental  payments  of  $4,554.    Rent 
paid under the Company’s lease during the years ended December 31, 2012 and 2011 was $54,648.   

F-39 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

16.    Fair Value Measurements 

ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an 
orderly  transaction  between  market  participants  at  the  measurement  date,  not  adjusted  for  transaction  costs.   
ASC 820 also establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure 
fair value into three broad levels giving the highest priority to quoted prices in active markets for identical assets 
or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3).     

The three levels are described below:   

Level 1 Inputs 

— 

Unadjusted quoted prices in active markets for identical assets or liabilities that is 
accessible by the Company; 

Level 2 Inputs 

— 

Quoted prices in markets that are not active or financial instruments for which all 
significant inputs are observable, either directly or indirectly; 

Level 3 Inputs 

— 

Unobservable inputs for the asset or liability including significant assumptions of 
the Company and other market participants. 

The following tables present assets and liabilities that are measured at fair value on a recurring basis and are 
categorized using the fair value hierarchy.    The fair value hierarchy has three levels based on the reliability 
of the inputs used to determine fair value. 

      Total       

Fair Value Measurements at December 31, 2012 
Level 3 

Level 1 

Level 2 

Assets: 
          Restricted Cash 
          Marketable Securities 
Total Assets: 

Liabilities:   
          Warrant Liabilities 

Assets: 
          Restricted Cash 
          Marketable Securities 
Total Assets: 

Liabilities:   
          Warrant Liabilities 

$ 

$ 

$ 

$ 

$ 

$ 

  1,091,801   $ 
  100,000  
  1,191,801   $ 

  1,054,301   $ 
  100,000  
  1,154,301   $ 

  37,500   $ 

  - 

  37,500   $ 

  - 
- 
  - 

  2,842,065  

- 

-  $ 

  2,842,065 

      Total       

Fair Value Measurements at December 31, 2011 
Level 3 
Level 2 
Level 1 

  1,431,765   $ 
  1,950,000  
  3,381,765   $ 

  1,394,265   $ 
  1,950,000  
  3,344,265   $ 

  37,500   $ 

- 

  37,500   $ 

  - 
- 
  - 

  868,725  

- 

-  $ 

  868,725  

F-40 

 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to Financial Statements 

As of December 31, 2012 and 2011, the Company’s restricted cash equivalents are comprised of the following: 

a)  Money market funds valued at the net asset value of shares held by the Company and is classified within 

level 1 of the fair value hierarchy;   

b)  Certificate of deposit valued based upon the underlying terms of a letter of credit, as disclosed in Note 

15, and classified within level 2 of the fair value hierarchy. 

Marketable securities consist of state authority and municipal security fund bonds which are valued at fair value 
and classified within level 1 of the fair value hierarchy.   

The fair value methodology for the warrant liabilities is disclosed in Note 12. 

The carrying amounts reported in the financial statements for cash and cash equivalents (Level 1), note receivable 
(Level 2), prepaid expenses, and other current assets and accounts payable and accrued expenses approximate fair 
value because of the short term maturity of these financial instruments. 

The following table sets forth a reconciliation of changes in the years ended December 31, 2012 and 2011 in the 
fair value of the liabilities classified as level 3 in the fair value hierarchy: 

Balance at January 1, 2012 
Additions 
Unrealized gains, net   
Unrealized gains on expiration 
Transfers out of level 3 
Balance at December 31, 2012 

Balance at January 1, 2011 
Additions 
Unrealized gains, net 
Unrealized gains on expiration 
Transfers out of level 3 
Balance at December 31, 2011 

Warrant Liabilities 

Total Level 3 Liabilities 

  868,725  $ 
  2,637,216   
  (663,876)  
-  
-  
  2,842,065  $ 

  868,725  
  2,637,216  
  (663,876) 
- 
- 
  2,842,065  

Warrant Liabilities 

Total Level 3 Liabilities 

  2,966,710  $ 
  2,924,333   
  (4,739,881)  
  (38,569)  
  (243,868)  
  868,725  $ 

  2,966,710  
  2,924,333  
  (4,739,881) 
  (38,569) 
  (243,868) 
  868,725  

$ 

 $ 

$ 

 $ 

Additions  consist  of  the  fair  value  of  warrant  liabilities  upon  issuance.    Transfers  out  of  Level  3  for  warrant 
liabilities consist of warrant exercises.    The Company’s policy is to recognize transfers in and transfers out as of the 
actual date of the event or change in circumstance that caused the transfer.      There were no significant transfers in 
and out of Levels 1 and 2 for the years ended December 31, 2012 and 2011. 

F-41 

 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
3.1 

3.2 

4.1 

4.2 

4.3 

*10.1.1 

*10.1.2 

*10.1.3 

*10.2 

*10.3 

10.4 

*10.5 

10.6 

10.7 

10.8 

10.9 

10.10 

EXHIBIT INDEX 
Amended and Restated Certificate of Incorporation, filed as Appendix G to the Company’s 
Definitive Proxy Statement on Schedule 14A (File No. 000-50590) dated April 29, 2005, is 
incorporated herein by reference. 
Amended and Restated Bylaws, filed as Exhibit 3.1 to the Company’s Current Report on 
Form 8-K filed on March 26, 2010, is incorporated herein by reference. 
Specimen Certificate for the Company’s Common Stock, par value $.0001 per share, filed as 
Exhibit 4.3 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Form of Senior Debt Securities Indenture, filed as Exhibit 4.3 to the Company’s Registration 
Statement on Form S-3 dated June 22, 2011, is incorporated herein by reference. 
Form of Subordinated Debt Securities Indenture, filed as Exhibit 4.4 to the Company’s 
Registration Statement on Form S-3 dated June 22, 2011 is incorporated herein by reference.     
Rexahn Pharmaceuticals, Inc. Stock Option Plan, as amended, filed as Exhibit 4.4 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Employees, filed as Exhibit 4.5.1 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Non-Employee Directors and Consultants, filed as 
Exhibit 4.5.2 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and C. H. Ahn, filed as Exhibit 10.1 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and T. H. Jeong, filed as Exhibit 10.3 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Lease Agreement, dated June 5, 2009, by and between Rexahn Pharmaceuticals, Inc. and The 
Realty Associates Fund V, L.P., filed as Exhibit 10.4 to the Company’s Quarterly Report on 
Form 10-Q for the quarterly period ended June 30, 2009, is incorporated herein by reference 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and Rakesh Soni, filed as Exhibit 10.2 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Securities Purchase Agreement, dated as of May 19, 2009 by and between Rexahn 
Pharmaceuticals, Inc. and the purchaser signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K filed on May 20, 2009, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Series I, II, and III Common Stock Purchase Warrants, 
filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on May 20, 2009, is 
incorporated herein by reference. 
Research and Exclusive License Option Agreement, dated as of June 26, 2009, by and 
between Rexahn Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited, filed as 
Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on September 21, 2009, is 
incorporated herein by reference.   
Securities Purchase Agreement, dated as of June 26, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited (the “Teva Securities 
Purchase Agreement”), filed as Exhibit 10.2 to the Company’s Current Report on Form 8-K 
filed on September 21, 2009, and Amendment No. 1 to the Teva Securities Purchase 
Agreement, filed as Exhibit 10.3 to the Company’s Current Report on Form 8-K filed on 
September 21, 2009, are incorporated herein by reference. 
Securities Purchase Agreement, dated as of October 19, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on October 20, 2009, is incorporated herein by 
reference. 

 
 
 
 
 
10.11 

10.12 

10.13 

10.14 

10.15 

10.16 

10.17 

10.18 

14 

16 

23 
24 
31.1 
31.2 
32.1 

32.2 

101.INS 
101.SCH 
101.CAL 
101.DEF 
101.LAB 
101.PRE 

Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on October 20, 2009, is incorporated 
herein by reference. 
Securities Purchase Agreement, dated as of    June 28, 2010 by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on June 29, 2010, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on June 29, 2010, is incorporated herein 
by reference. 
Amendment No. 2 to the Teva Securities Purchase Agreement, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K filed on January 20, 2011, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on March 30, 2011, is incorporated 
herein by reference. 
Amendment No. 2 to the Research and Exclusive License Option Agreement, dated as of 
November 27, 2012, by and between Rexahn Pharmaceuticals, Inc. and Teva Pharmaceutical 
Industries Limited, filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K filed 
on November 27, 2012, is incorporated herein by reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on November 30, 2012, is incorporated 
herein by reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.2 
to the Company’s Current Report on Form 8-K filed on November 30, 2012 is incorporated 
herein by reference. 
Code of Ethics and Business Conduct, filed as Exhibit 14 to the Company’s , Annual Report 
on 10-K for the fiscal year ended December 31, 2008, filed on March 16, 2009, is 
incorporated herein by reference. 
Letter of Lazar Levine & Felix LLP dated February 27, 2009, filed as Exhibit 16.1 to the 
Company’s Amended Current Report on Form 8-K filed on March 2, 2009, is incorporated 
herein by reference. 
Consent of ParenteBeard LLC, independent registered public accounting firm.     
Power of Attorney. 
Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a).   
Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). 
Certification  of  Chief  Executive  Officer  of  Periodic  Report  Pursuant  to  18  U.S.C. 
Section 1350. 
Certification  of  Chief  Financial  Officer  of  Periodic  Report  Pursuant  to  18  U.S.C. 
Section 1350. 
XBRL Instance Document 
XBRL Taxonomy Extension Schema 
XBRL Taxonomy Calculation Linkbase 
XBRL Taxonomy Definition Linkbase 
XBRL Taxonomy Label Linkbase 
XBRL Taxonomy Presentation Linkbase 

_______________________ 
* Management contract or compensation plan or arrangement.