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Vertex Pharmaceuticals

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FY1996 Annual Report · Vertex Pharmaceuticals
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SECURITIES AND EXCHANGE COMMISSION 
WASHINGTON, D.C. 20549 

FORM 10-K 
(Mark One) 

X ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 
- ----- ACT OF 1934 

FOR THE FISCAL YEAR ENDED DECEMBER 31, 1996 

OR 

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

For the transition period from _________ to ________ 

Commission file number 0-19319 

VERTEX PHARMACEUTICALS INCORPORATED 

(Exact name of registrant as specified in its charter) 

        MASSACHUSETTS                              04-3039129 
  (State of incorporation)            (I.R.S. Employer Identification 
No.) 

           130 WAVERLY STREET 
        CAMBRIDGE, MASSACHUSETTS                  02139-4242 
(Address of principal executive offices)          (Zip Code) 

                                 (617) 577-6000 
              (Registrant's telephone number, including area code) 

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

Common Stock, $0.01 par value 
(Title of class) 

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

As of March 14, 1997 there were outstanding 24,680,649 shares of Common Stock, $.01 par value per share. The aggregate market 
value of shares of Common Stock held by non-affiliates of the registrant, based upon the last sales price for such stock on that date as 
reported by The Nasdaq Stock Market, was approximately $1,130,544,000. 

DOCUMENTS INCORPORATED BY REFERENCE 

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Portions of the definitive Proxy Statement for the 1997 Annual Meeting of Stockholders to be held on May 8, 1997 are incorporated 
by reference into Part III. 
This Annual Report on Form 10-K contains forward-looking statements based on current management expectations. When used in this 
Report, the words "expects" "anticipates," "estimates," "plans," and similar expressions are intended to identify forward-looking 
statements. Such statements are subject to risks and uncertainties. Factors that could cause actual results to differ from these 
expectations include, but are not limited to, thosed discussed in the section of Item 1 entitled "Risk Factors." These forward-looking 
statements speak only as of the date of this Report. The Company expressly disclaims any obligation or undertaking to release publicly 
any updates or revisions to any forward-looking statements contained herein to reflect any change in the Company's expectations with 
regard thereto or any change in the events, conditions or circumstances on which any such statement is based. 

ITEM 1. BUSINESS 

PART I 

Vertex is engaged in the discovery, development and commercialization of novel, small molecule pharmaceuticals for the treatment of 
diseases for which there are currently limited or no effective treatments. The Company is a leader in the use of structure-based drug 
design, an approach to drug discovery that integrates advanced biology, biophysics and chemistry in a coordinated and simultaneous 
fashion. The Company believes that this integrated approach is applicable to therapeutic targets in a broad range of diseases. Vertex's 
goal is to create a portfolio of highly specific, proprietary, small molecule drugs based on its knowledge of the atomic structure of 
proteins involved in the control of disease processes. The Company's drug candidates for the treatment of human immunodeficiency 
virus ("HIV") infection and acquired immune deficiency syndrom ("AIDS"), cancer multidrug resistance ("MDR") in cancer and two 
genetic hemoglobin disorders are currently in clinical development. In addition, the Company has preclinical and research programs 
aimed at developing orally available small molecule compounds to treat autoimmune diseases, inflammatory diseases, 
neurodegenerative diseases and hepatitis C infection. 

STRUCTURE-BASED DRUG DESIGN 

Drugs are natural or synthetic compounds that interact with a target molecule, typically a protein, either to induce or to inhibit that 
molecule's function within the human body. Traditionally, pharmaceutical products have been discovered through the screening of 
thousands of compounds, either from existing chemical libraries or from fermentation broths, against a predictive assay for a particular 
disease target. The Company believes that traditional pharmaceutical discovery is an essentially random process which is costly and 
inefficient. Advances in biotechnology have led to another method of developing drugs based on the isolation and production of 
human recombinant proteins. The Company believes that this approach also has limitations because the resulting pharmaceuticals are 
large molecules that cannot be administered orally, are difficult to manufacture and have applications which are limited to the disease 
state in which the protein is involved. 

Vertex is developing pharmaceutical products using a structure-based drug design approach, which is distinct from the traditional 
pharmaceutical and biotechnological approaches. By determining and modeling the three dimensional atomic structure of a target 
protein, the Company intends to rationally design or alter chemical compounds to specifically interact with the targeted protein. The 
Company believes that structure-based drug design increases the chances for the discovery of multiple lead compounds for selected 
protein targets, including targets for which traditional drug discovery has met with limited success. Moreover, the Company believes 
that the structure-based drug design process may accelerate optimization of lead compounds, since modification of a lead compound 
may be undertaken with knowledge of the relationship between the compound's structure and its desired therapeutic effect, rather than 
through experimentation 

with randomly generated modifications to that compound. 

-2- 

The Company's approach to structure-based design is an integrated approach combining efforts in biology, biophysics and chemistry in 
a coordinated and simultaneous fashion. To acquire structural information, Vertex applies advanced biophysical and computational 
tools, including x-ray crystallography, nuclear magnetic resonance spectroscopy and high resolution computer modeling. As structural 
information is gathered, the Company uses combinatorial, computational and medicinal chemistry to design and produce novel, highly 
specific small molecule compounds that possess the characteristics required for therapeutic benefit. To arrive at initial lead 
compounds, the Company may use traditional approaches, such as screening chemical libraries, natural products or combinatorial 
libraries in addition to using known chemical compounds or may apply direct computational methods (de novo design). Throughout 
the process, the Company develops biological assays and proprietary animal models, some of which employ the latest advances in 
genomics techniques, in order to analyze the function of target proteins. Using these tools, the Company optimizes compounds for 
potency and pharmaceutical properties, including tolerability and pharmacokinetics, and manufacturability. The Company selects 
clinical candidates from among optimized compounds based on the results of in vitro and in vivo tests designed to predict the 

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compounds' safety and efficacy. 

Vertex expects to employ all of its core technologies from the initial phases of a program through the entire discovery process. 
Information generated through the application of one scientific technique becomes part of the information base from which further 
advances may be made by Vertex scientists using other development techniques. Using its approach to structure-based drug design, 
Vertex has demonstrated that it is able to solve atomic structures of target proteins, generate lead compounds that bind to the target in 
vitro and optimize those compounds to produce drug candidates with desirable pharmaceutical attributes. The Company believes that 
its integrated structure-based approach to drug discovery and the applicability of this approach to a broad range of protein targets 
provides the Company with significant competitive advantages in the discovery and development of novel therapeutics for a variety of 
diseases. 

CORPORATE STRATEGY 

Vertex is concentrating on the discovery and development of drugs for the treatment of viral diseases, multidrug resistance in cancer, 
hemoglobin disorders, autoimmune diseases, inflammatory diseases and neurodegenerative diseases. The Company's research and 
development strategy is to identify therapeutic areas in which there is (i) an unmet clinical need, (ii) evidence that interaction with 
known protein targets will produce a therapeutic effect and (iii) evidence that the protein targets will be appropriate for structural 
analysis using Vertex's scientific approach. The Company's business strategy is to form collaborations with pharmaceutical companies 
in programs for which they can provide resources and access to competencies complementary to Vertex's in-house capabilities. 

PRODUCT DEVELOPMENT AND RESEARCH PROGRAMS 

The following are the Company's most advanced product development and research programs. 

CLINICAL PROGRAMS 

HIV PROGRAM 

Overview 

Vertex is developing orally deliverable antiviral drugs to treat HIV infection and AIDS. The Company is collaborating with Glaxo 
Wellcome plc. ("Glaxo Wellcome") and Kissei 

Pharmaceutical Co., Ltd. ("Kissei") in the development of its most advanced HIV protease inhibitor, VX-478. Glaxo Wellcome has 
initiated multi-center Phase III clinical trials to assess the safety and efficacy of VX-478 in HIV-positive individuals. The Phase III 
clinical trials are intended to support the submission of a New Drug Application ("NDA") for market approval in the United States and 
equivalent submissions in Europe and other territories. However, there can be no assurance that these clinical trials will result in the 
submission or approval of an NDA for VX-478. 

-3- 

Background 

As of June 1996, approximately 548,000 cases of AIDS had been reported to the U.S. Centers for Disease Control and Prevention and 
the current population of surviving AIDS patients in the U.S. was estimated to be approximately 205,000. The U.S. Centers for 
Disease Control also estimates that more than 700,000 additional people in the United States are infected with HIV. In 1996, the 
World Health Organization reported that approximately 1,500,000 AIDS cases had been reported worldwide, but it is estimated that 
the actual total number of cases was over 8,400,000. 

AIDS is caused by infection with HIV. HIV infection causes severe immunosuppression and, eventually, death by attacking and 
destroying T-cells, which coordinate much of the network of normal immune responses. Progression from HIV infection to AIDS may 
take many years. Currently, there are two classes of antiviral drugs approved for the treatment of AIDS, reverse transcriptase inhibitors 
and protease inhibitors. AZT, ddI, ddC and 3TC are drugs that act by inhibiting reverse transcriptase, an enzyme required for viral 
replication. The clinical utility of each of these drugs is limited by significant side effects and by the development of viral resistance. 
While certain anti-HIV drugs may be used alone, the clinical utility of these drugs may be improved if these drugs are administered in 
combination. Such combination therapy can delay the onset of viral resistance. Due to the limitations of AZT and other reverse 
transcriptase inhibitors, there has been significant interest in developing anti-HIV agents that work by alternative mechanisms such as 
HIV protease inhibitors, which act by blocking another viral enzyme involved in HIV replication. The FDA has approved for 
marketing HIV protease inhibitors developed by Merck & Co., Inc., Hoffmann-La Roche, Abbott Laboratories, Inc., and Agouron 
Pharmaceuticals, Inc. 

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The Company believes that the market for protease inhibitors is competitive and that a protease inhibitor compound's utility may be 
evaluated based on several key characteristics. These characteristics include efficacy, convenient dosing regimen, high bioavailability 
and pharmacokinetics (i.e., high absorption into and sustained presence in the bloodstream), the ability to penetrate the brain and 
lymph systems from the bloodstream, an acceptable resistance profile, a favorable side effect profile and practical manufacture. 

Clinical Status 

Vertex's HIV and AIDS program is focused on the development of a highly specific protease inhibitor designed to effectively block 
the replication of HIV and to possess key competitive characteristics. In February 1997, Glaxo Wellcome began a multi-center Phase 
III clinical trial in the United States, Canada and Europe to evaluate the tolerability, antiviral efficacy, and durability of the antiviral 
response of VX-478 in combination with AZT and 3TC. The protocol calls for VX-478 to be administered orally at a dose of 1200 mg 
twice daily in combination with AZT and 3TC. A second group treated with AZT and 3TC will provide a comparison arm for the 
clinical trial. Approximately 290 HIV-positive adults are expected to enroll in the trial. In addition, the Company anticipates that 
Glaxo Wellcome will begin in the first half of 1997 a second multi-center Phase III clinical trial in the United States and Europe to 
assess the safety and efficacy of VX-478 in children. There can be no assurance that clinical trials will result in the submission or 
approval of an NDA for VX-478 or that trials that have not yet begun will commence. See "Risk Factors -- Uncertainties Related to 
Clinical Trials" and " -- Manufacturing Uncertainties; Reliance on Third 

Party Manufacturers." 

-4- 

In addition to the Phase III trials with AZT and 3TC discussed above, clinical trials of VX-478 alone and in combination with other 
anti-HIV agents are being conducted. In September 1996, Glaxo Wellcome initiated a 12-week dose-range finding Phase II clinical 
trial testing the safety and efficacy of VX-478 in combination with AZT and 3TC. Recently, this study has been amended to extend 
dosing to a minimum of 48 weeks. This study has completed enrollment of approximately 80 participants and the duration of the study 
has been extended to 24 weeks. In January 1997, Glaxo Wellcome initiated a 24-week Phase II clinical trial of VX-478 in double 
protease regimens, pairing VX-478 with saquinavir (Roche), indinavir (Merck) or nelfinavir (Agouron). Approximately 48 patients are 
expected to enroll in the study. Through a collaboration with the ACTG, Glaxo Wellcome, Kissei and Vertex, a 24-week Phase II 
clinical trial was initiated in February 1997 to evaluate the safety and efficacy of VX-478 as a single agent. A second group treated 
with VX-478, AZT and 3TC will provide a comparison for the clinical trial. The trial will be conducted in the United States at 10 
AIDS Clinical Trial Group ("ACTG") clinical centers and is expected to enroll approximately 84 HIV-positive individuals. In 1997, 
Glaxo Wellcome plans to initiate a clinical trial to assess the use of VX-478 in combination with 1592U89, a new reverse transcriptase 
inhibitor in development by Glaxo Wellcome. There can be no assurance, however, that these clinical trials will commence or proceed 
as currently anticipated. See "Risk Factors -- Uncertainties Related to Clinical Trials" and " -- Dependence on Collaborative Partners." 

In January 1997, Glaxo Wellcome reported preliminary results from a 60-patient multi-center Phase I/II clinical trial conducted in the 
United States and Europe suggesting that VX-478 is well-tolerated and displays potent antiviral activity. At the three highest doses of 
VX-478 administered as a single agent (900 mg, 1050 mg or 1200 mg twice daily), the median maximal decrease in viral load ranged 
from 1.69 to 1.89 logs, indicating potent antiviral activity. The results indicated that the antiviral activity of VX-478 was 
dose-dependent, with increasing doses providing better antiviral effect. The trial also included the administration of VX-478 at a dose 
of 900 mg (twice daily) in combination with 1592U89 (300 mg twice daily). For the combination, five of seven patients had viral loads 
below the level of detection (400 copies/ml) at four weeks. The median maximal decrease in viral load in this combination group was 
2.08 logs. Adverse events reported in the trial, such as rash, nausea and loose stool/diarrhea, were mild and reversible in most cases. 
The combination of VX-478 and 1592U89 was well-tolerated, with nausea being the most commonly reported adverse event in this 
combination. Of the 60 participants in the trial, five withdrew based on adverse events. The data from this trial is preliminary and 
incomplete. There can be no assurance that these results are predictive of results that will be obtained in any future clinical trials. See 
"Risk Factors -- Uncertainties Related to Clinical Trials." 

In January 1997, Glaxo Wellcome also reported preliminary data from the Phase I/II clinical trial suggesting that resistance did not 
develop to VX-478 administered as a single agent over the four week time period. The results of the genotype (sequence) and 
phenotype (drug sensitivity) analyses of virus isolated from patients participating in the Phase I/II study (at doses of 300 mg twice 
daily; 300 mg three times daily; 900 mg twice daily or 1200 mg twice daily) indicated that resistance did not appear to develop to 
VX-478, whether at the lower doses or at the higher doses, where potent antiviral activity was observed. There can be no assurance 
that resistance will not occur when VX-478 is administered for longer periods or in combination with other antiviral agents. See "Risk 
Factors -- Early Stage of Development; Technological Uncertainty." 

In 1995, Kissei completed single dose and multi-dose, placebo-controlled, Phase I clinical trials. Results from these trials reported in 
May 1996 indicated that VX-478 was well-tolerated, with no significant adverse experiences or laboratory test abnormalities observed 

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at the doses tested. Vertex expects that Kissei will initiate Phase II/III efficacy trials in 1997 in HIV-positive patients that will be 
designed based on clinical data from Glaxo Wellcome. There can be no assurance, however, that these clinical trials will commence or 
proceed as currently anticipated. See "Risk Factors -- Uncertainties Related to Clinical Trials," " -- Manufacturing Uncertainties; 

Reliance on Third Party Manufacturers" and " -- Dependence on Collaborative Partners." 

-5- 

In collaboration with Glaxo Wellcome, Vertex also is engaged in research to develop additional lead classes of HIV protease 
inhibitors. This research is focused on designing compounds with resistance profiles distinct from VX-478. 

The Company has one issued United States patent, ten United States patent applications pending, and foreign counterparts to some of 
those applications, that claim classes of chemical compounds and/or their uses which include within their scope the Company's lead 
drug candidates for treating HIV infection and AIDS. The issued patent and five of the ten United States patent applications, have 
claims that include VX-478 within their literal scope. Vertex recently received a Notice of Allowance for claims covering the use of 
VX-478 to treat AIDS-related central nervous system disorders. In addition, the Company has one United States patent application that 
claims processes for preparing synthetic intermediates useful in the synthesis of a class of compounds that includes VX-478. The 
Company also has a non-exclusive, worldwide license under certain G.D. Searle & Company ("Searle") patent applications claiming 
HIV protease inhibitors. See "Risk Factors -- Uncertainty Related to Patents and Proprietary Information." 

CANCER MULTIDRUG RESISTANCE PROGRAM 

Overview 

Vertex is developing novel compounds to treat and prevent the occurrence of drug resistance associated with the failure of cancer 
chemotherapy by inhibiting cellular mechanisms believed to be responsible for MDR. Two cellular mechanisms implicated in MDR 
are P-glycoprotein, or "MDR1," and multidrug resistance associated protein, or "MRP." In June 1996, Vertex commenced a Phase II 
multi-center clinical trial to assess the safety and efficacy of the co-administration of VX-710 and doxorubicin in patients with liver 
cancer. In 1997, Vertex plans to initiate a Phase II multi-center clinical trial to assess the safety and efficacy of the co-administration 
of VX-710 and paclitaxel in patients with breast cancer. Vertex is collaborating with BioChem Therapeutic, Inc. ("BioChem"), a 
subsidiary of Biochem Pharma (International) Inc., for the development and commercialization of VX-710 in Canada. The Company 
expects that BioChem will initiate Phase II clinical trials of VX-710 for two additional cancers in Canada in 1997. In April 1996, the 
Company commenced a Phase I/II dose escalating clinical trial with a second MDR inhibitor, VX-853, an orally-administered 
compound in a chemical class distinct from intravenously administered VX-710, in combination with doxorubicin in patients with 
solid tumors. 

Background 

According to the American Cancer Society, there will be an estimated 530,000 new cases of breast, ovarian, lung, liver and colorectal 
tumors in the United States in 1997. In addition, the American Cancer Society also estimates that there will be an estimated 95,000 
new patients each year in the United States afflicted with blood cancers, such as multiple myeloma, acute myeloid leukemia and 
non-Hodgkin's lymphoma. The Company believes that a significant number of these patients may not be effectively treated by 
chemotherapy because of MDR. 

Multidrug resistance is frequently associated with the failure of chemotherapy. A major contributing factor to MDR is the presence of 
molecular pumps that function to expel toxins out of the cell. MDR occurs when these pumps, including MDR1 and MRP, expel 
chemotherapeutic agents from cancer cells, preventing the sustained delivery of potent levels of the chemotherapeutic agents required 
for therapeutic benefit. As a consequence, such resistant tumor cells cannot be killed efficiently by anticancer drugs such as 
methotrexate, doxorubicin, vincristine and paclitaxel. MDR1 has been implicated in MDR in a variety of cancers including liver 
cancer, colon cancer, 

-6- 
pancreatic cancer, chronic myelogenous leukemia and certain lung cancers. MRP was recently identified as another drug efflux pump 
and is believed responsible for resistance observed in additional tumor types. 

No drug has been approved by the FDA specifically for the treatment of MDR, however, several compounds are in advanced clinical 
studies. Certain agents, such as dex-verapamil and an analog of cyclosporin A, have been shown in preliminary human studies to have 
some effectiveness in overcoming clinical resistance to certain commonly used chemotherapeutic agents. The Company believes these 
drugs may have side effects that could limit broad use. 

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Clinical Status 

Vertex's lead compound, VX-710, has displayed potent activity in vitro as an inhibitor of MDR for a number of chemotherapeutic 
agents in a variety of tumor types. In June 1996, Vertex initiated a Phase II multi-center clinical trial to assess the safety and efficacy 
of the co-administration of VX-710 and doxorubicin in patients with liver cancer. The comparison arm for the study involves the 
administration of doxorubicin alone. Cross-over from the comparison arm to the study arm is allowed. The clinical trial is expected to 
enroll up to 70 patients. The Company has recently added additional investigative sites in order to accelerate enrollment in the trial. In 
1997, Vertex plans to initiate a Phase II multi-center trial to assess the safety and efficacy of the co-administration of VX-710 and 
paclitaxel in patients with breast cancer. The primary efficacy endpoints in both trials will be response rate and time to disease 
progression. In addition, BioChem is planning to initiate Phase II clinical trials of VX-710 in Canada in 1997 in combination with 
paclitaxel in patients with ovarian cancer and in combination with doxorubicin in patients with soft tissue sarcoma. There can be no 
assurance, however, that clinical trials will commence or proceed as currently anticipated. See "Risk Factors -- Uncertainties Related 
to Clinical Trials," " -- Manufacturing Uncertainties; Reliance on Third Party Manufacturers" and " -- Dependence on Collaborative 
Partners." 

In April 1996, a principal investigator for the ongoing Phase I/II trial reported preliminary results for the VX-710/doxorubicin 
combination. The findings, based on 22 patients receiving intravenous doses of up to 160 mg/m(2)/hr, suggest that the regimen was 
well-tolerated, with generally mild and reversible side effects at the doses tested. The results also showed that the regimen can be 
successfully administered to achieve blood levels shown to reverse MDR in vitro and in preclinical studies. The investigator also 
reported that VX-710 did not appear to alter markedly the clearance or half-life of doxorubicin, which the Company believes will 
provide future flexibility for dosage. Investigators used an imaging agent, which is ordinarily expelled from the liver by MDR1, as a 
marker for MDR1 inhibition by VX-710. In this trial, the level of retention of the imaging agent in the liver suggested that VX-710 
was blocking the activity of MDR1. 

Vertex's research has identified several proprietary compounds, in addition to VX-710, that are able to return drug resistant cells to a 
state of drug sensitivity in vitro. In November 1995, Vertex scientists reported in vitro MDR inhibition results for VX-853, an orally 
administered compound in a chemical class distinct from VX-710. The research showed that VX-853 potently blocks MDR mediated 
by both MDR1 and MRP. In April 1996, the Company commenced a Phase I/II dose-escalating clinical trial of VX-853 in 
combination with doxorubicin in patients with solid tumors. 

The Company has one issued United States patent, five United States patent applications pending and several foreign counterpart 
applications claiming VX-710 and other compounds for treating multidrug resistance. Vertex recently received a Notice of Allowance 
for claims covering VX-710 and structurally related compounds. The issued United States patent claims VX-853 and structurally 
related compounds. The Company may seek orphan drug status for certain indications of its MDR compounds. 

HEMOGLOBIN DISORDERS PROGRAM 

-7- 

Overview 

Vertex is developing VX-366, a drug to treat sickle cell disease and beta thalassemia, two inherited blood disorders for which there 
currently are a limited number of treatments. The Company is collaborating with Alpha Therapeutic Corporation ("Alpha"), a 
subsidiary of Green Cross Corporation, and Ravizza Farmaceutici ("Ravizza"), a subsidiary of BASF, in the development of its 
hemoglobin disorder compounds. 

Background 

Sickle cell disease affects one in 375 African-Americans and, to a lesser extent, persons of Eastern Mediterranean, Indian or Saudi 
Arabian ancestry. There were an estimated 75,000 sickle cell cases and 10,000 beta thalassemia cases in the United States and Europe 
as of 1994. 

Sickle cell disease and beta thalassemia are inherited disorders caused by defects in the gene for adult hemoglobin. These diseases are 
associated with life-threatening organ damage, cause chronic and recurrent pain and predispose affected individuals to severe 
infection. 

There are currently a limited number of treatments for beta thalessemia and sickle cell disease. Hydroxyurea, an oral compound 
currently marketed as an anti-cancer agent, has been shown, in a Phase III study conducted by the National Institutes of Health, to 
improve the symptoms of patients with sickle cell disease. The Company believes, however, that this compound has limitations due to 
toxic side effects. Other treatments used to combat symptoms of sickle cell disease and beta thalassemia include antibiotics, pain 

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killers and blood transfusions. Several compounds are in clinical development by a number of companies for the treatment of these 
diseases. 

Clinical Status 

Vertex's drug in development for hemoglobin disorders is VX-366. Vertex acquired VX-366, a butyrate compound, in August 1993 
under an exclusive license from Children's Hospital Medical Center of Oakland. In June 1996, Ravizza reported results of a four-week 
Phase II trial in 12 patients with beta thalassemia, which indicated that VX-366 increased participants' levels of hemoglobin F, a form 
of hemoglobin that has been shown to improve symptoms and extend the life span of individuals with sickle cell disease and beta 
thalassemia. In September 1995, Vertex entered into a license agreement with Alpha for the development and commercialization of 
VX-366 in North, Central and South America. There can be no assurance, however, that clinical trials involving VX-366 will proceed 
or that future trials will commence. See "Risk Factors -- Uncertainties Related to Clinical Studies," " -- Manufacturing Uncertainties; 
Reliance on Third Party Manufacturers" and " -- Dependence on Collaborative Partners." 

Four United States patents have issued, which are licensed exclusively by Vertex from Children's Hospital. Three of these patents 
claim the use of VX-366 in the treatment of hemoglobin disorders, including sickle cell disease and beta thalassemia. Because 
Children's Hospital did not foreign file the application corresponding to that reissue application within one year of filing its 
corresponding United States application, the Company's foreign patent rights may be limited. Vertex has filed three United States 
patent applications claiming various compounds and their use in the treatment of hemoglobin disorders. 

PRECLINICAL PROGRAMS 

IMPDH PROGRAM 

Overview 

-8- 

Vertex is developing novel, orally deliverable immunosuppressive drugs that it believes could selectively halt the growth of 
lymphocytes by blocking inosine monophosphate dehydrogenase ("IMPDH"), an enzyme which controls DNA synthesis in 
lymphocytes. In December 1996, Vertex selected VX-497 as a lead drug development candidate for autoimmune diseases. Vertex 
currently is conducting preclinical trials of VX-497 and plans to initiate clinical trials of VX-497 in 1998. 

Background 

The activation and proliferation of lymphocytes are associated with a variety of autoimmune diseases, including asthma, psoriasis, 
rheumatoid arthritis and systemic lupus, as well as with transplant rejection. Vertex believes that blocking the enzyme IMPDH with an 
oral compound designed to specifically bind to the active site of IMPDH may provide a novel way to inhibit the progress of 
autoimmune diseases. The Company is aware of only one specific inhibitor of IMPDH currently on the market in the United States, 
Hoffmann-La Roche's mycophenolate mofetil, which is approved for acute kidney transplant rejection. The Company believes that 
compound-specific side effects of mycophenolate mofetil may limit its use for chronic autoimmune disorders. 

Preclinical Status 

Vertex has identified novel lead classes of IMPDH inhibitors. In December 1996, Vertex selected VX-497 as a lead drug development 
candidate for autoimmune diseases. In laboratory tests and in models of autoimmune disease and transplantation performed to date, 
VX-497 has been a potent and well-tolerated immunosuppressive agent. Vertex currently is conducting preclinical trials of VX-497. 
The Company plans to initiate clinical trials of VX-497 in 1998. Vertex intends to evaluate VX-497 for psoriasis, an autoimmune 
disease of the skin, as the first clinical indication for the compound. There can be no assurance, however, that clinical trials will 
commence or proceed as currently anticipated. See"Risk Factors -- Early Stages of Development; Technological Uncertainty," " - -- 
Manufacturing Uncertainties; Reliance on Third Party Manufacturers" and " -- Uncertainties Related to Clinical Trials." 

The Company has two United States patent applications pending, claiming inhibitors of IMPDH, including VX-497 and related 
compounds. The Company has another United States patent application pending that claims the crystal structure of IMPDH and the 
use of that structure to design inhibitors. 

INFLAMMATION PROGRAM 

Overview 

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Vertex is developing novel drugs to treat acute and chronic inflammatory conditions, including pancreatitis, osteoarthritis and 
rheumatoid arthritis. The Company is collaborating with Hoechst Marion Roussel ("HMR") in the development of compounds to block 
interleukin-1 beta converting enzyme ("ICE"), which mediates the production and release of the inflammatory cytokine IL-1 beta, as 
well as the production of gamma interferon. In February 1997, Vertex selected VX-740 as a lead drug development candidate for 
inflammatory diseases. 

-9- 
Background 

Elevation of IL-1 beta levels has been correlated to a number of acute and chronic inflammatory diseases such as asthma, 
inflammatory bowel disease, osteoarthritis, pancreatitis and rheumatoid arthritis. There are approximately 2,500,000 cases of 
rheumatoid arthritis in the United States alone. ICE was first characterized in late 1991 and represents a novel target for 
anti-inflammatory drug discovery. Although several companies are pursuing ICE as a drug target, Vertex is not aware of any company 
with an ICE-inhibiting compound in clinical development, and there currently are no IL-1 beta inhibitors approved for marketing. 

Preclinical Status 

Vertex and HMR have designed potential small molecule inhibitors of ICE that could be used for the treatment of both acute and 
chronic inflammatory disorders such as asthma, inflammatory bowel disease, osteoarthritis, pancreatitis and rheumatoid arthritis. In 
February 1997, Vertex selected VX-740 as a lead drug development candidate for inflammatory diseases. 

Vertex scientists recently discovered that ICE plays a key role in the production of gamma interferon, a key immunoregulator that 
modulates antigen presentation, T-cell activation, and cell adhesion. This research was published in the January 10, 1997 issue of the 
journal Science. Based on the discovery of a new role for ICE in the production of gamma interferon, Vertex plans to investigate ICE 
inhibitors for additional therapeutic uses such as in metastatic cancer, diabetes and sepsis. See "Risk Factors -- Early Stages of 
Development; Technological Uncertainty," " -- Manufacturing Uncertainties; Reliance on Third Party Manufacturers" and " -- 
Uncertainties Related to Clinical Trials." 

The Company has fourteen patent applications pending in the United States and several foreign counterpart patent applications 
claiming inhibitors of ICE. Vertex recently received a Notice of Allowance in one of those applications. The Company has three patent 
applications pending in the United States and several foreign counterpart applications claiming the crystal structure of ICE and 
derivatives thereof and various uses of those structures. 

RESEARCH PROGRAMS 

Neurophilins 

Vertex has designed novel, orally deliverable, small molecule compounds that have the potential to be developed as drugs to treat 
neurodegenerative diseases, including stroke, peripheral neuropathies and Parkinson's disease and Alzheimer's disease. Vertex has 
conducted laboratory experiments the results of which suggest that certain of its compounds stimulate nerve growth. In 1996, Vertex 
reported results in a rat model of peripheral nerve injury. The neurophilin compound accelerated the onset of foot movement and 
walking compared to the control. In addition, the compound produced a 50 percent increase in the average size of nerve cells in the 
injured area as compared to the control animals. Vertex has identified several promising lead compounds and plans to test those 
compounds in additional models of nerve growth. 

The Company has five United States patent applications claiming the use of certain of its immunosuppressive compounds and certain 
of its multidrug resistance compounds for nerve growth applications. The Company also has one issued United States patent and nine 
United States patent applications pending that claim compounds useful in nerve growth applications. 

Caspases (Apoptosis) 

-10- 

The goal of Vertex's caspases program is to discover and develop drugs useful for treating neurodegenerative disorders such as 
Alzheimer's disease and Parkinson's disease as well as for the prevention of tissue damage resulting from myocardial and cerebral 
ischemia. 

Vertex is conducting research to design novel drugs for apoptosis (programmed cell death) for neurodegenerative diseases and other 
neurodegenerative conditions. This drug discovery effort is based on the Company's knowledge of ICE and its homologues, the 
caspases. Vertex has gained a detailed understanding of apoptotic pathways using biological, genomic, and structural data from ICE 

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homologues. Vertex has solved the X-ray structure of CPP32, a caspase believed to be important in neuronal apoptosis, and is using 
structural information to design small molecule lead compounds that selectively block CPP32 and other caspases. 

The Company has one United States patent application claiming a protein involved in apoptosis. 

Hepatitis C Protease 

The Company is conducting discovery research to design orally deliverable drugs to inhibit hepatitis C protease, an enzyme generally 
believed to be essential for replication of the hepatitis C virus ("HCV"). Discovered in 1989, HCV causes chronic inflammation in the 
liver. In a majority of patients, HCV establishes a chronic infection that can persist for decades and eventually lead to cirrhosis, liver 
failure and liver cancer. HCV infection represents a significant medical problem worldwide for which there is inadequate or no therapy 
for a majority of patients. Sources at the U.S. Centers for Disease Control and Prevention recently estimated that approximately 3.9 
million Americans, or more than one percent of the population, may be infected with HCV. Currently, there is no vaccine available to 
prevent hepatitis C infection. In addition, the only drug approved for the treatment of hepatitis C, interferon alpha, provides long-term 
therapeutic benefit to less than 25 percent of patients treated. 

In 1996, Vertex solved the structure of the hepatitis C protease, using X-ray crystallography. Vertex is utilizing a variety of advanced 
techniques, as well as its experience with HIV protease inhibitors, to design inhibitors of HCV protease enzyme. 

Vertex has one United States patent application pending claiming inhibitors of HCV protease. Vertex also has one United States patent 
application pending claiming the crystal structure of HCV protease and the use of that structure to design inhibitors. Vertex has an 
additional United States patent application claiming methods of identifying HCV protease inhibitors. 

MAP Kinases 

Vertex is conducting research to design novel anti-inflammatory drugs based on small molecule inhibitors of MAP kinases. MAP 
kinases regulate both interleukin-1 and tumor necrosis factor, hormones involved in inflammation and programmed cell death. In 1996, 
Vertex solved the structure of p38 MAP kinase using X-ray crystallography. Vertex is conducting research to solve additional related 
MAP kinases. Together with the structural information now available, Vertex is using structure-directed high throughput screening to 
identify novel lead inhibitors of p38 MAP kinase. 

Vertex has one United States patent application pending claiming inhibitors of p38 MAP Kinase. 

CORPORATE COLLABORATIONS 

-11- 

Vertex has entered into corporate collaborations with pharmaceutical companies that provide financial and other resources, including 
capabilities in research, development and sales and marketing, to support the Company's research and development programs. To date, 
the Company has entered into the following major corporate collaborations. 

Glaxo Wellcome plc. 

Vertex and Glaxo Wellcome are collaborating on the development of Vertex's HIV protease inhibitors. Under the collaborative 
agreement, which commenced in December 1993, Glaxo Wellcome is obligated to pay Vertex up to $42.0 million, comprised of a 
$15.0 million initial license payment paid in December 1993, $14.0 million of product research funding over five years and $13.0 
million of development and commercialization milestone payments for an initial drug candidate. From the inception of the agreement 
in December 1993 through December 31, 1996, Vertex has recognized as revenue $25.0 million. Glaxo Wellcome is also obligated to 
pay to Vertex additional development and commercialization milestone payments for subsequent drug candidates. In addition, Glaxo 
Wellcome is required to bear the costs of development in its territory under the collaboration. Glaxo Wellcome has exclusive rights to 
develop and commercialize Vertex HIV protease inhibitors in all parts of the world except the Far East and will pay Vertex a royalty 
on sales. Vertex has retained certain bulk drug manufacturing rights and certain co-promotion rights in the territories licensed to Glaxo 
Wellcome. See " -- HIV Program." 

Glaxo Wellcome has the right to terminate the research collaboration under its agreement with the Company without cause upon 
twelve months' notice given at any time and has the right to terminate the license arrangements under its agreement with the Company 
without cause upon twelve months' notice, provided such notice is not given before the research collaboration has been terminated. 
Termination by Glaxo Wellcome of the research collaboration under its agreement with the Company will relieve Glaxo Wellcome of 
its obligation to make further research support payments under the agreement. Termination by Glaxo Wellcome of the license 
arrangements under the agreement will relieve Glaxo Wellcome of its obligation to make further commercialization and development 

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milestone and royalty payments, and will end any license granted to Glaxo Wellcome by Vertex thereunder, and could have a material 
adverse effect on the Company's business and result of operations. See "Risk Factors -- Dependence on Collaborative Partners." 

In June 1996, Vertex and Glaxo Wellcome obtained a non-exclusive, worldwide license under certain Searle patent applications 
claiming HIV protease inhibitors to permit Vertex and Glaxo Wellcome to develop, manufacture and market VX-478 free of the risk 
of intellectual property claims by Searle. Vertex and Glaxo Wellcome paid Searle $15.0 million and $10.0 million, respectively, for 
the license. In addition, the terms of the license require Vertex to pay Searle a royalty on sales. In connection with this transaction, 
Glaxo Wellcome purchased 151,792 shares of the Company's Common Stock at a price of $32.94 per share, with net proceeds to the 
Company of approximately $5.0 million. 

Kissei Pharmaceutical Co., Ltd. 

Vertex and Kissei are collaborating on the development of Vertex's VX-478 HIV protease inhibitor. Under the collaborative 
agreement, which commenced in April 1993, Kissei is obligated to pay to Vertex up to $20.0 million, comprised of $9.8 million of 
product research funding over three years, $7.0 million of development and commercialization milestone payments and a $3.2 million 
equity investment. From the inception of the agreement in April 1993 through December 31, 1996, $17.8 million has been received, 
including $14.6 million recognized as revenue and $3.2 million as an equity investment. The Company has received the full amount of 
research funding specified under the agreement. Kissei has exclusive rights to develop and 

commercialize VX-478 in Japan, the People's Republic of China and several other countries in the Far East and will pay Vertex a 
royalty on sales. Vertex will manufacture bulk product for Kissei. See " -- HIV Program." 

-12- 

Hoechst Marion Roussel 

Vertex and HMR are collaborating on the development of ICE inhibitors as anti-inflammatory agents. Under the collaborative 
agreement, which commenced in September 1993, HMR is obligated to pay to Vertex up to $30.5 million, comprised of $18.5 million 
of product research funding over five years and $12.0 million of development and commercialization milestone payments. From the 
inception of the agreement in September 1993 through December 31, 1996, $14.5 million has been recognized as revenue. HMR has 
exclusive rights to develop and market drugs resulting from the collaborative effort in Europe, Africa and the Middle East, and Vertex 
has exclusive development and marketing rights in the rest of the world, except the Far East, where Vertex shares those rights with 
HMR. HMR is obligated to pay a royalty to Vertex on any sales made in Europe, and Vertex is obligated to pay a royalty to HMR on 
any sales made in the United States or the rest of the Americas. Each party will have the option to co-promote products in the other 
party's exclusive territory. Vertex and HMR will each have rights to develop and market the drugs in Far Eastern countries including 
Japan. 

HMR has the right to terminate the agreement at any time without cause upon twelve months' notice. For a period of one year after any 
such termination, HMR retains the right to select one or more compounds for development and to license such compound or 
compounds from Vertex, provided HMR resumes research funding and commercialization milestone payments and makes all such 
payments that would otherwise have been due but for such termination. See " -- Inflammation Program." 

BioChem Therapeutic, Inc. 

The Company and BioChem are collaborating on the development and commercialization of VX-710, the Company's lead compound 
in its cancer multidrug resistance program. Under the collaborative agreement, which commenced in May 1996, BioChem is obligated 
to pay the Company up to $4.0 million comprised of an initial license payment of $500,000 and development and commercialization 
milestone payments. BioChem also is obligated to bear the costs of development of VX-710 in Canada. BioChem has exclusive rights 
to develop and commercialize VX-710 in Canada. The Company will supply BioChem's requirements of bulk and finished forms of 
VX-710. BioChem will make payments to the Company for those materials based on sales of products by BioChem, which will cover 
Vertex's cost of supplying materials and will provide a profit to Vertex. 

BioChem has the right to terminate the agreement without cause upon six months' notice at any time after May 8, 1997. Termination 
will relieve BioChem of any further payment obligations and will end any license granted to BioChem by Vertex under the agreement. 
See " -- Cancer Multidrug Resistance Program." 

Alpha Therapeutic Corporation 

Vertex and Alpha are collaborating on the development and commercialization of VX-366 for the treatment of sickle cell disease and 
beta thalassemia. Under the collaborative agreement, which commenced in October 1995, Alpha has agreed to pay Vertex up to $5.0 

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million comprised of an initial license payment and development and commercialization milestone payments. From the inception of 
the agreement in October 1995 through December 31, 1996, $500,000 has been recognized as revenue. In addition, Alpha is obligated 
to pay the costs of development of VX-366 under the collaboration. Alpha has exclusive rights to develop and commercialize VX-366 
in 

-13- 
North, Central and South America. Vertex retains rights in the rest of the world and retains all manufacturing rights worldwide. Alpha 
will pay Vertex a royalty based on commercial product sales and will purchase from Vertex its requirements for drug product. 

Alpha has the right to terminate the agreement without cause upon six months' notice at any time. Termination will relieve Alpha of 
any further payment obligations under the agreement and will end any license granted to Alpha by Vertex thereunder. See " -- 
Hemoglobin Disorders Program." 

Ravizza Farmaceutici S.p.A. 

Vertex and Ravizza are collaborating to conduct clinical trials with VX-366 for beta thalassemia and sickle cell disease. Under the 
collaboration, which commenced in September 1994, Vertex and Ravizza will share data generated in their respective clinical trial 
programs. Ravizza has completed a Phase II clinical trial of VX-366 in Italy in patients with beta thalassemia. In addition, the 
arrangement creates a framework for negotiation of an agreement for clinical development and commercialization of VX-366 in 
Europe. There can be no assurance, however, that the parties will enter into any such agreement. See " -- Hemoglobin Disorders 
Program." 

ALTUS BIOLOGICS INC. 

Altus Biologics Inc. ("Altus") is a subsidiary of Vertex established in January 1993 to develop, manufacture and sell a class of 
industrial catalysts based on a novel and proprietary technology for stabilizing proteins. Altus' initial products use the Company's 
CLEC(R) technology to produce cross-linked enzyme crystals. 

Although enzymes are among nature's most efficient catalysts, their large-scale commercial use has been limited by their instability and 
general incompatibility with many industrial chemical processes. As a result of experiments conducted by Altus and several 
commercial partners and prospective customers, the Company believes that CLEC products have properties that overcome many of 
these limitations and make them superior to conventional catalysts and enzymes in certain commercial and industrial processes. The 
Company believes that CLEC products can be used as catalysts in the manufacture of pharmaceuticals, fine chemicals, foods and 
sweeteners, among other things. 

Since mid-1994, Altus has launched nine commercial catalyst products in two product families: ChiroCLEC(TM), for the preparation 
of optically pure pharmaceuticals and specialty chemicals, and PeptiCLEC(TM), for use in peptide coupling reactions. Altus expects 
to launch additional products in 1997. Approximately 215 companies worldwide have purchased CLEC products for feasibility testing. 
Altus recently entered into a research and development collaboration with Ciba-Geigy Limited for the development of CLEC 
technology for commercial use in detergents. 

Altus is conducting research and development aimed at expanding the uses of its CLEC technology to such applications as nerve gas 
detoxification, detergenting and anti-oxidants for cosmetics. Some of this research is supported by grants from U.S. government 
agencies including the National Institutes of Health, National Science Foundation and the Department of Defense. 

The Company has ten United States patent applications and several foreign counterpart applications and patents relating to its CLEC 
technology. The Company recently received a Notice of Allowance in one of these applications. 

PATENTS AND PROPRIETARY INFORMATION 

-14- 

The Company has rights in certain patents and pending patent applications that relate to compounds it is developing and methods of 
using such compounds. The Company actively seeks, when appropriate, protection for its products and proprietary information by 
means of United States and foreign patents, trademarks and contractual arrangements. In addition, the Company relies upon trade 
secrets and contractual arrangements to protect certain of its proprietary information and products. 

As of February 20, 1997, the Company had a total of six United States patents and 63 United States pending patent applications. The 
Company also has an exclusive license under four United States patents, one of which is subject to a reissue application and a 
non-exclusive, worldwide license under certain Searle patent applications claiming HIV protease inhibitors. Three of the licensed 

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patents and the reissue application claim the use of compounds, including VX-366, for treating hemoglobin disorders, including sickle 
cell disease and beta thalassemia. The Company has one issued United States patent and ten United States patent applications claiming 
antiviral compounds, and/or their uses, for treating HIV infection and AIDS. The issued patent and five of the ten applications have 
claims that include VX-478, the Company's lead drug candidate, within their literal scope. Vertex recently received a Notice of 
Allowance for claims covering the use of VX-478 to treat AIDS-related central nervous system disorders. Another of the Company's 
United States patent applications claims processes for preparing synthetic intermediates useful in the synthesis of a class of compounds 
that includes VX-478. The Company's non-exclusive, worldwide license permits Vertex to develop, manufacture and market VX-478 
free of intellectual property claims by Searle. The Company has one issued United States patent and five United States patent 
applications claiming VX-710 and other compounds for treating multidrug resistance. Vertex recently received a Notice of Allowance 
for claims covering VX-710 and structurally related compounds. The issued patent claims VX-853 and structurally related 
compounds. The Company has two United States patent applications pending, claiming inhibitors of IMPDH, including VX-497 and 
related compounds. The Company has another United States patent application pending that claims the crystal structure of IMPDH and 
the use of that structure to design inhibitors. The Company has fourteen United States patent applications pending claiming inhibitors 
of ICE. Vertex recently received a Notice of Allowance in one of those applications. The Company has three patent applications 
pending in the United States claiming the crystal structure of ICE and derivatives thereof and various uses of those structures. The 
Company has five United States patent applications pending claiming the use of certain of its immunosuppressive compounds and 
certain of its multidrug resistance compounds for nerve growth applications. The Company also has one issued United States patent 
and nine patent applications pending that claim compounds useful in nerve growth application. The Company has three United States 
patents and four United States patent applications claiming specific immunosuppressive compounds. Vertex recently received a Notice 
of Allowance in two of those four applications. The Company has one United States patent application claiming a protein involved in 
apoptosis. The Company has one United States patent application pending claiming inhibitors of p38 MAP kinase. The Company also 
has one United States patent application pending claiming inhibitors of HCV protease. The Company has one United States patent 
application pending claiming the crystal structure of HCV protease and the use of that structure to design inhibitors. The Company has 
ten United States patent applications claiming CLEC technology. The Company recently received a Notice of Allowance in one of 
these applications. The Company has one United States patent claiming a novel device useful in pharmaceutical research. The 
Company also has filed international and foreign counterparts based on several of its United States patents and patent applications. 

There can be no assurance that any patents will issue from any of the Company's patent applications or, even if patents issue or have 
issued, that the claims thereof will provide the Company with any significant protection against competitive products or otherwise be 
valuable commercially. Legal standards relating to the validity of patents and the proper scope of their 

-15- 

claims in the biopharmaceutical field are still evolving, and there is no consistent policy regarding the breadth of claims allowed in 
biopharmaceutical patents. No assurance can be given as to the Company's ability to avoid infringing, and thus having to negotiate a 
license under, any patents issued to others, or that a license to such patents would be available on commercially acceptable terms, if at 
all. Further, there can be no assurance that any patents issued to or licensed by the Company will not be infringed by the products of 
others, which may require the Company to engage in patent infringement litigation. In addition to being a party to patent infringement 
litigation, the Company could be required to participate in interference proceedings declared by the United States Patent and 
Trademark Office. Defense or prosecution of patent infringement litigation, as well as participation in interference proceedings, can be 
expensive and time consuming, even in those instances in which the outcome is favorable to the Company. If the outcome of any such 
litigation or proceeding were adverse, the Company could be subject to significant liabilities to third parties, could be required to 
obtain licenses from third parties or could be required to cease sales of the affected products, any of which could have a material 
adverse effect on the Company. See "Risk Factors -- Uncertainty Related to Patents and Proprietary Information." 

The Company has licensed on an exclusive basis four United States patents and one United States issue application from Children's 
Hospital. Three of these patents and the reissue application claim the use of compounds, including VX-366, in the treatment of 
hemoglobin disorders, including sickle cell disease and beta thalassemia. Because Children's Hospital did not foreign file the 
application corresponding to the reissue application within one year of filing its corresponding United States application, the 
Company's foreign patent rights may be limited. In addition, there can be no assurance that others will not develop independently 
substantially equivalent technology, obtain access to the Company's know-how or be issued patents which may prevent the sale of 
Company products or require licensing and the payment of significant fees or royalties by the Company in order for it to carry on its 
business. Furthermore, there can be no assurance that any such license will be available. 

Much of the Company's technology and many of its processes are dependent upon the knowledge, experience and skills of key 
scientific and technical personnel. To protect its rights to its proprietary know-how and technology, the Company requires all 
employees, consultants, advisors and collaborators to enter into confidentiality agreements that prohibit the disclosure of confidential 
information to anyone outside the Company. These agreements require disclosure and assignment to the Company of ideas, 
developments, discoveries and inventions made by employees, consultants, advisors and collaborators. There can be no assurance that 
these agreements will effectively prevent disclosure of the Company's confidential information or will provide meaningful protection 

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for the Company's confidential information if there is unauthorized use or disclosure. Furthermore, in the absence of patent protection, 
the Company's business may be adversely affected by competitors who independently develop substantially equivalent technology. See 
" -- Corporate Collaborations," and "Risk Factors -- Dependence on Collaborative Partners" and " -- Uncertainty Relating to Patents 
and Proprietary Information." 

MANUFACTURING 

The Company relies on third party manufacturers to produce its compounds for preclinical and clinical purposes and may do so for 
commercial production of any compounds that are approved for marketing. The Company has established a quality assurance program, 
including a set of standard operating procedures, intended to ensure that third party manufacturers under contract produce the 
Company's compounds in accordance with the FDA's current Good Manufacturing Practices ("cGMP") and other applicable 
regulations. See " -- Government Regulation." 

The Company believes that all of its existing compounds can be produced using established manufacturing methods, primarily through 
standard techniques of pharmaceutical synthesis. The 

-16- 

Company currently does not have the capacity to manufacture its potential products, is dependent on third party manufacturers or 
collaborative partners for the production of its compounds for preclinical research and clinical trial purposes and expects to be 
dependent on such manufacturers or collaborative partners for some or all commercial production of any of its compounds that are 
approved for marketing. The Company believes that it will be able to continue to negotiate such arrangements on commercially 
reasonable terms and that it will not be necessary for it to develop internal manufacturing capability in order to successfully 
commercialize its products. In the event that the Company is unable to obtain contract manufacturing, or obtain such manufacturing on 
commercially reasonable terms, it may not be able to commercialize its products as planned. The Company's objective is to maintain 
flexibility in deciding whether to develop internal manufacturing capabilities for certain of its potential products. The Company has no 
experience in manufacturing pharmaceutical or other products or in conducting manufacturing testing programs required to obtain 
FDA and other regulatory approvals, and there can be no assurance that the Company will develop such capabilities successfully. 

Since the Company's potential products are at an early stage of development, the Company will need to improve or modify its existing 
manufacturing processes and capabilities to produce commercial quantities of any drug product economically. The Company cannot 
quantify the time or expense that may ultimately be required to improve or modify its existing process technologies, but it is possible 
that such time or expense could be substantial. 

The production of Vertex's compounds is based in part on technology that the Company believes to be proprietary. Vertex may license 
this technology to contract manufacturers to enable them to manufacture compounds for the Company. There can be no assurance that 
such manufacturers will abide by any limitations or confidentiality restrictions in licenses with Vertex. In addition, any such 
manufacturer may develop process technology related to the manufacture of Vertex's compounds that such manufacturer owns either 
independently or jointly with the Company. This would increase the Company's reliance on such manufacturer or require the Company 
to obtain a license from such manufacturer in order to have its products manufactured. There can be no assurance that any such license 
would be available on terms acceptable to the Company, if at all. 

Some of the Company's current corporate partners have certain manufacturing rights with respect to the Company's products under 
development, and there can be no assurance that such corporate partners' rights will not impede the Company's ability to conduct the 
development programs and commercialize any resulting products in accordance with the schedules and in the manner currently 
contemplated by the Company. See "Risk Factors -- Manufacturing Uncertainties; Reliance on Third Party Manufacturers." 

COMPETITION 

The Company is engaged in pharmaceutical fields characterized by extensive research efforts, rapid technological progress and intense 
competition. There are many public and private companies, including pharmaceutical companies, chemical companies and 
biotechnology companies, engaged in developing products for the human therapeutic applications targeted by Vertex. Further, the 
Company believes that interest in the application of structure-based drug design and related technologies may continue and may 
accelerate as the technologies become more widely understood. The Company is aware of efforts by others to develop products in each 
of the areas in which the Company has products in development. For example, Merck & Co., Inc., Abbott Laboratories, Inc., 
Hoffmann-La Roche, and Agouron Pharmaceuticals, Inc. have HIV protease inhibitors which have been approved by the U.S. Food 
and Drug Administration ("FDA") for marketing. The Company is also aware of other companies that have HIV protease inhibitors in 
development. There also are a number of competitors that have products under development for the treatment of MDR in cancer and 
for the treatment of hemoglobin disorders. In order for the Company to compete successfully 

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-17- 
in these areas, it must demonstrate improved safety, efficacy, ease of manufacturing and market acceptance over its competitors, who 
have received regulatory approval and are currently marketing. Furthermore, academic institutions, governmental agencies and other 
public and private research organizations are conducting research to develop technologies and products that may compete with those 
under development by the Company. In addition, other technologies are, or may in the future become, the basis for competing 
products. There can be no assurance that the Company's competitors will not succeed in developing technologies and products that are 
more effective than any being developed by the Company or that would render the Company's technology and products obsolete or 
noncompetitive. In addition, there can be no assurance that the Company's products in development will be able to compete effectively 
with products which are currently on the market. 

Many of the Company's competitors have substantially greater financial, technical and human resources than those of the Company. In 
addition, many of the Company's competitors have significantly greater experience than the Company in conducting preclinical testing 
and human clinical trials of new pharmaceutical products, and in obtaining FDA and other regulatory approvals of products. 
Accordingly, certain of the Company's competitors may succeed in obtaining regulatory approval for products more rapidly than the 
Company. If the Company obtains regulatory approval and commences commercial sales of its products, it will also compete with 
respect to manufacturing efficiency and sales and marketing capabilities, areas in which it currently has no experience. See "Risk 
Factors -- Rapid Technological Change and Competition." 

PHARMACEUTICAL PRICING AND REIMBURSEMENT 

The Company's ability to commercialize its products successfully will depend in part on the extent to which appropriate 
reimbursement levels for the cost of such products and related treatment are obtained from government authorities, private health 
insurers and other organizations, such as health maintenance organizations ("HMOs"). Third party payors and government authorities 
are continuing efforts to contain or reduce the cost of health care. For example, in certain foreign markets, pricing and/or profitability 
of prescription pharmaceuticals are subject to government control. There can be no assurance that similar controls will not be 
implemented in the United States. Also, the trend toward managed health care in the United States and the concurrent growth of 
organizations such as HMOs, which could control or significantly influence the purchase of health care services and products, may 
result in lower prices for the Company's products. The cost containment measures that health care providers and third party payors are 
instituting and any proposed or future health care reform measures, including any reductions in Government reimbursement programs 
such as Medicaid and Medicare, could affect the Company's ability to sell its products and may have a material adverse effect on the 
Company. 

The success of the Company's products in the United States and other significant markets will depend, in part, upon the extent to which 
a consumer will be able to obtain reimbursement for the cost of such products from government health administration authorities, 
third-party payors and other organizations. Significant uncertainty exists as to the reimbursement status of newly approved therapeutic 
products. Even if a product is approved for marketing, there can be no assurance that adequate reimbursement will be available. The 
Company is unable to predict what additional legislation or regulation relating to the health care industry or third-party coverage and 
reimbursement may be enacted in the future or what effect the legislation or regulation would have on the Company's business. Failure 
to obtain reimbursement could have a material adverse effect on the Company. 

GOVERNMENT REGULATION 

The Company's development, manufacture and potential sale of therapeutics are subject to extensive regulation by United States and 
foreign governmental authorities. In particular, 

pharmaceutical products are subject to rigorous preclinical and clinical testing and to other approval requirements by the FDA in the 
United States under the Food, Drug and Cosmetic Act and by comparable agencies in most foreign countries. 

-18- 

As an initial step in the FDA regulatory approval process, preclinical studies are typically conducted in animals to identify potential 
safety problems. For certain diseases, animal models exist that are believed to be predictive of human efficacy. For such diseases, a 
drug candidate is tested in an animal model. The results of the studies are submitted to the FDA as a part of the Investigational New 
Drug application ("IND"), which is filed to comply with FDA regulations prior to commencement of human clinical testing. For other 
diseases for which no appropriately predictive animal model exists, no such results can be filed. For several of the Company's drug 
candidates, no appropriately predictive model exists. As a result, no in vivo evidence of efficacy would be available until such 
compounds progress to human clinical trials. 

Clinical trials are typically conducted in three sequential phases, although the phases may overlap. In Phase I, which frequently begins 
with the initial introduction of the drug into healthy human subjects prior to introduction into patients, the compound will be tested for 

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safety, dosage tolerance, absorption, bioavailability, biodistribution, metabolism, excretion, clinical pharmacology and, if possible, for 
early information on effectiveness. Phase II typically involves studies in a small sample of the intended patient population to assess the 
efficacy of the drug for a specific indication, to determine dose tolerance and the optimal dose range and to gather additional 
information relating to safety and potential adverse effects. Phase III trials are undertaken to further evaluate clinical safety and 
efficacy in an expanded patient population at geographically dispersed study sites, to determine the overall risk-benefit ratio of the 
drug and to provide an adequate basis for physician labeling. Each trial is conducted in accordance with certain standards under 
protocols that detail the objectives of the study, the parameters to be used to monitor safety and the efficacy criteria to be evaluated. 
Each protocol must be submitted to the FDA as part of the IND. Further, each clinical study must be evaluated by an independent 
Institutional Review Board ("IRB") at the institution at which the study will be conducted. The IRB will consider, among other things, 
ethical factors, the safety of human subjects and the possible liability of the institution. 

Data from preclinical testing and clinical trials are submitted to the FDA in a New Drug Application ("NDA") for marketing approval. 
The process of completing clinical testing and obtaining FDA approval for a new drug is likely to take a number of years and require 
the expenditure of substantial resources. Preparing an NDA involves considerable data collection, verification, analysis and expense, 
and there can be no assurance that approval will be granted on a timely basis, if at all. The approval process is affected by a number of 
factors, including the severity of the disease, the availability of alternative treatments and the risks and benefits demonstrated in 
clinical trials. The FDA may deny an NDA if applicable regulatory criteria are not satisfied or may require additional testing or 
information. Among the conditions for marketing approval is the requirement that the prospective manufacturer's quality control and 
manufacturing procedures conform to the FDA's cGMP regulations, which must be followed at all times. In complying with standards 
set forth in these regulations, manufacturers must continue to expend time, monies and effort in the area of production and quality 
control to ensure full technical compliance. Manufacturing establishments, both foreign and domestic, also are subject to inspections 
by or under the authority of the FDA and by or under the authority of other federal, state or local agencies. 

Even after initial FDA approval has been obtained, further studies, including post-marketing studies, may be required to provide 
additional data on safety and will be required to gain approval for the use of a product as a treatment for clinical indications other than 
those for which the product was initially tested. Also, the FDA will require post-marketing reporting to monitor the side effects of the 
drug. Results of post-marketing programs may limit or expand further marketing of the products. Further, if there are any 
modifications to the drug, including changes in indication, 

manufacturing process, labeling or manufacturing facilities, an NDA supplement may be required to be submitted to the FDA. 

-19- 

The Orphan Drug Act provides incentives to drug manufacturers to develop and manufacture drugs for the treatment of diseases or 
conditions that affect fewer than 200,000 individuals in the United States. Orphan drug status can also be sought for diseases or 
conditions that affect more than 200,000 individuals in the United States if the sponsor does not realistically anticipate its product 
becoming profitable from sales in the United States. Under the Orphan Drug Act, a manufacturer of a designated orphan product can 
seek tax benefits, and the holder of the first FDA approval of a designated orphan product will be granted a seven-year period of 
marketing exclusivity for that product for the orphan indication. While the marketing exclusivity of an orphan drug would prevent 
other sponsors from obtaining approval of the same compound for the same indication, it would not prevent other types of drugs from 
being approved for the same use. The Company has obtained orphan drug status for VX-366 for the treatment of beta thalessemia and 
sickle cell disease and, in the future, may apply for orphan drug status for certain indications of MDR in cancer. 

Under the Drug Price Competition and Patent Term Restoration Act of 1984, a sponsor may be granted marketing exclusivity for a 
period of time following FDA approval of certain drug applications if FDA approval is received before the expiration of the patent's 
original term. This marketing exclusivity would prevent a third party from obtaining FDA approval for a similar or identical drug 
through an Abbreviated New Drug Application ("ANDA"), which is the application form typically used by manufacturers seeking 
approval of a generic drug. The statute also allows a patent owner to extend the term of the patent for a period equal to one-half the 
period of time elapsed between the filing of an IND and the filing of the corresponding NDA plus the period of time between the filing 
of the NDA and FDA approval. The Company intends to seek the benefits of this statute, but there can be no assurance that the 
Company will be able to obtain any such benefits. 

Whether or not FDA approval has been obtained, approval of a drug product by regulatory authorities in foreign countries must be 
obtained prior to the commencement of commercial sales of the product in such countries. Historically, the requirements governing the 
conduct of clinical trials and product approvals, and the time required for approval, have varied widely from country to country. 

In addition to the statutes and regulations described above, the Company is also subject to regulation under the Occupational Safety 
and Health Act, the Environmental Protection Act, the Toxic Substances Control Act, the Resource Conservation and Recovery Act 
and other present and potential future federal, state and local regulations. See "Risk Factors -- Extensive Government Regulation." 

   2002.  EDGAR Online, Inc.

HUMAN RESOURCES 

As of December 31, 1996, Vertex had 178 full-time employees, including 136 in research and development, 23 in laboratory support 
services and 19 in general and administrative functions, and three part-time employees. The Company's scientific staff members (58 of 
whom hold Ph.D. and/or M.D. degrees) have diversified experience and expertise in molecular and cell biology, biochemistry, animal 
pharmacology, synthetic organic chemistry, protein x-ray crystallography, protein nuclear magnetic resonance spectroscopy, 
computational chemistry, biophysical chemistry, medicinal chemistry, clinical pharmacology and clinical medicine. In addition, the 
Company's Altus subsidiary had 19 full-time employees as of December 31, 1996. The Company's employees are not covered by a 
collective bargaining agreement, and the Company considers its relations with its employees to be good. 

EXECUTIVE OFFICERS 

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The names, ages and positions held by the executive officers of the Company are as follows: 

Name                          Age    Position 
- ----                          ---    -------- 
Joshua S. Boger, Ph.D.....    45     Director, President and Chief 
                                     Executive Officer 

Richard H. Aldrich........    42     Senior Vice President and Chief Business 
                                     Officer 

Vicki L. Sato, Ph.D.......    48     Senior Vice President of Research and 
                                     Development and Chief Scientific Officer; 
                                     Chair of the Scientific Advisory Board 

Iain P. M. Buchanan.......    43     Vice President of European Operations; 
                                     Managing Director of Vertex 
Pharmaceuticals 
                                     (Europe) Limited 

Thomas G. Auchincloss, Jr. 35 Vice President of Finance and Treasurer 

All executive officers are elected by the Board of Directors to serve in their respective capacities until their successors are elected and 
qualified or until their earlier resignation or removal. 

Dr. Boger is a founder of the Company and was its President and Chief Scientific Officer from its inception in 1989 until May 1992, 
when he became President and Chief Executive Officer. Dr. Boger has been a director since the Company's inception. Prior to 
founding the Company in 1989, Dr. Boger held the position of Senior Director of Basic Chemistry at Merck Sharp & Dohme Research 
Laboratories in Rahway, New Jersey, where he headed both the Department of Medicinal Chemistry of Immunology & Inflammation 
and the Department of Biophysical Chemistry. Dr. Boger is also a Director of Millennium Pharmaceuticals, Inc. Dr. Boger holds a 
B.A. in chemistry and philosophy from Wesleyan University and M.S. and Ph.D. degrees in chemistry from Harvard University. 

Mr. Aldrich served as Vice President of Business Development of the Company from June 1989 to May 1992, when he became Vice 
President and Chief Business Officer. In December 1993, Mr. Aldrich was promoted to Senior Vice President and Chief Business 
Officer. He joined Vertex from Integrated Genetics, where he headed that company's business development group. Previously, he 
served as Program Executive at Biogen, Inc., where he coordinated worldwide commercial development of several 
biopharmaceuticals, and as Licensing Manager at Biogen S.A. in Geneva, Switzerland, where he managed European and Far Eastern 
licensing. Mr. Aldrich previously worked at the Boston Consulting Group, an international management consulting firm. Mr. Aldrich 
received a B.S. degree from Boston College and an M.B.A. from the Amos Tuck School of Business, Dartmouth College. 

Dr. Sato joined Vertex in September 1992 as Vice President of Research and was appointed Senior Vice President of Research and 
Development in September 1994. Previously, she was Vice President, Research and a member of the Scientific Board of Biogen, Inc. 
As research head at Biogen, she directed research programs in the fields of inflammation, immunology, AIDS therapy and 
cardiovascular therapy from early research into advanced product development. Dr. Sato received an A.B. in biology from Radcliffe 
College and A.M. and Ph.D. degrees from Harvard University. Following postdoctoral work in chemistry and immunology at the 

   2002.  EDGAR Online, Inc.

University of 

California at Berkeley and Stanford Medical School, she was appointed to the faculty of Harvard University in the Department of 
Biology. 

-21- 

Mr. Buchanan joined the Company in April 1994 from Cilag AG, a subsidiary of Johnson & Johnson based in Zug, Switzerland, where 
he served as its Regional Licensing Director since 1987. He previously held the position of Marketing Director of Biogen, Inc. in 
Switzerland. Prior to Biogen, Mr. Buchanan served in Product Management at Merck Sharp & Dohme (UK) Limited. Mr. Buchanan 
holds a B.Sc. from the University of St. Andrews, Scotland. 

Mr. Auchincloss joined the Company in October 1994 after serving as an investment banker at Bear, Stearns & Co. Inc. since 1988, 
most recently as Associate Director of the Corporate Finance Department. Prior to Bear Stearns, Mr. Auchincloss was a financial 
analyst for PaineWebber, Inc. Mr. Auchincloss holds a B.S. from Babson College and an M.B.A. from The Wharton School, 
University of Pennsylvania. 

SCIENTIFIC ADVISORY BOARD 

-22- 

The Company's Scientific Advisory Board  consists of individuals with demonstrated expertise in various fields who advise the 
Company concerning long-term scientific planning, research and development. The Scientific Advisory Board also evaluates the 
Company's research programs, recommends personnel to the Company and advises the Company on technological matters. The 
members of the Scientific Advisory Board, which is chaired by Dr. Vicki L. Sato, are: 

Vicki L. Sato, Ph.D........   Senior Vice President of Research and 
                              Development and Chief Scientific 
                              Officer, Vertex Pharmaceuticals 
Incorporated. 

Steven J. Burakoff, M.D....   Chair, Department of Pediatric Oncology, 
                              Dana-Farber Cancer Institute; Professor 
                              of Pediatrics, Harvard Medical School. 

Eugene H. Cordes, Ph.D.....   Professor of Pharmacy and Chemistry, 
                              University of Michigan at Ann Arbor. 

Jerome E. Groopman, M.D....   Chief of the Division of Experimental 
                              Medicine, Beth Israel Deaconess Medical 
                              Center; Recanti Chair in Immunology and 
                              Professor of Medicine, Harvard Medical 
                              School. 

Stephen C. Harrison, Ph.D..   Professor of Biochemistry and Molecular 
                              Biology, Harvard University; 
                              Investigator, Howard Hughes Medical 
                              Institute; Professor of Biological 
                              Chemistry and Molecular Pharmacology and 
                              Professor of Pediatrics, Harvard Medical 
                              School. 

Jeremy R. Knowles, D. Phil.   Dean of the Faculty of Arts and 
                              Sciences, Harvard University; Amory 
                              Houghten Professor of Chemistry and 
                              Biochemistry, Harvard University. 

Robert T. Schooley, M.D....   Head, Infectious Disease Division, 
                              University of Colorado Health Sciences 
                              Center; Professor of Medicine, 
                              University of Colorado. 

   2002.  EDGAR Online, Inc.

Other than Dr. Sato, none of the members of the Scientific Advisory Board is employed by the Company, and members may have 
other commitments to or consulting or advisory contracts with their employers or other entities that may conflict or compete with their 
obligations to the Company. Accordingly, such persons are expected to devote only a small portion of their time to the Company. In 
addition to its Scientific Advisory Board, Vertex has established consulting relationships with a number of scientific and medical 
experts who advise the Company on a project-specific basis. 

-23- 
RISK FACTORS 

The following risk factors should be considered carefully in addition to the other information contained in this Report. 

EARLY STAGE OF DEVELOPMENT; TECHNOLOGICAL UNCERTAINTY 

The Company was founded in 1989 and has not generated any pharmaceutical product sales. To achieve profitable operations, the 
Company, alone or with others, must successfully develop, clinically test, market and sell its products. Any products resulting from the 
Company's product development efforts are not expected to be available for sale in the near future, if at all. 

The development of new pharmaceutical products is highly uncertain and subject to a number of significant risks. Potential products 
that appear to be promising at early stages of development may not reach the market for a number of reasons. Such reasons include the 
possibilities that the potential products are found ineffective or cause harmful side effects during preclinical testing or clinical trials, 
fail to receive necessary regulatory approvals, are difficult or uneconomical to manufacture on a large scale, fail to achieve market 
acceptance or are precluded from commercialization by proprietary rights of third parties. 

The products that the Company is pursuing will require extensive additional development, testing and investment, as well as regulatory 
approvals, prior to commercialization. No assurance can be given that the Company's product development efforts will be successful, 
that required regulatory approvals will be obtained or that any products, if introduced, will be commercially successful. Further, the 
Company has no sales and marketing capabilities, and even if the Company's products in development are approved for marketing, 
there can be no assurance that the Company will be able to develop such capabilities. In addition, only a limited number of drugs 
developed through structure-based drug design have completed clinical trials successfully, been approved by the FDA and been 
marketed. One of the Company's potential products, VX-478, is an HIV protease inhibitor which is currently in Phase II clinical trials. 
The Company and its collaborative partners recently began Phase III clinical trials. To date, HIV has been shown to develop resistance 
to antiviral drugs, including currently marketed HIV protease inhibitors. There can be no assurance that such disease resistance or 
other factors will not limit the efficacy of the Company's HIV protease inhibitor. The clinical efficacy of the suppression of 
mechanisms of action of MDR in chemotherapy in the treatment of cancer is unproven, and, therefore, there can be no assurance that 
the Company's MDR compounds in development will improve the efficacy of chemotherapy. There also can be no assurance that drug 
candidates being pursued by the Company will be safe and efficacious, will receive regulatory approvals or will result in commercially 
successful products. If any of the Company's development programs is not successfully completed, required regulatory approvals are 
not obtained, or products for which approvals are obtained are not commercially successful, the Company's business, financial 
condition and results of operations would be materially adversely affected. See "Business -- Product Development and Research 
Programs." 

UNCERTAINTIES RELATED TO CLINICAL TRIALS 

Before obtaining required regulatory approvals for the commercial sale of products under development, the Company must 
demonstrate through preclinical studies and clinical trials that such products are safe and efficacious for use in each target indication. 
The results of preclinical and initial clinical trials of products under development by the Company are not necessarily predictive of 
results that will be obtained from large-scale clinical testing, and there can be no assurance that clinical trials of products under 
development will demonstrate the safety and efficacy of such products or will result in a marketable product. The safety and efficacy 
of a therapeutic product under development by the Company must be supported by extensive data from clinical trials. A number of 
companies have suffered significant setbacks in advanced clinical trials, despite 

promising results in earlier trials. The Company currently has four product candidates undergoing clinical trials, VX-478, VX-710, 
VX-853 and VX-366. In addition, the Company has a number of products undergoing preclinical development. The data observed to 
date is preliminary, and there can be no assurance that the results of ongoing and future trials will be consistent with results observed 
in earlier clinical trials or will be sufficient for approval. The failure to demonstrate adequately the safety and efficacy of a therapeutic 
drug under development could delay or prevent regulatory approval of the product and could have a material adverse effect on the 
Company. In addition, the FDA may require additional clinical trials, which could result in increased costs and significant 

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   2002.  EDGAR Online, Inc.

development delays. 

The administration alone or in combination with other drugs of any product developed by the Company may produce undesirable side 
effects in humans. The occurrence of such side effects could interrupt, delay or halt clinical trials of such products and could ultimately 
prevent their approval by the FDA or foreign regulatory authorities for any or all targeted indications. The Company or the FDA may 
suspend or terminate clinical trials at any time if it is believed that the trial participants are being exposed to unacceptable health risks. 
Even after approval by the FDA and foreign regulatory authorities, products may later exhibit adverse effects that discourage 
widespread use or necessitate their withdrawal from the market. There can be no assurance that any products under development by 
the Company will be safe when administered to patients. 

The rate of completion of clinical trials of the Company's products is dependent upon, among other factors, the rate of patient accrual. 
Patient accrual is a function of many factors, including the size of the patient population, the proximity of patients to clinical sites, the 
eligibility criteria for the trial and the availability of clinical trial material. Delays in planned patient enrollment in clinical trials may 
result in increased costs, program delays or both, which could have a material adverse effect on the Company. There can be no 
assurance that if clinical trials are completed the Company will be able to submit an NDA or that any such application will be reviewed 
and approved by the FDA in a timely manner, if at all. See "Business -- Government Regulation." 

DEPENDENCE ON COLLABORATIVE PARTNERS 

The Company is engaged in research and development collaborations with Glaxo Wellcome, HMR, Kissei, Alpha and BioChem 
pursuant to which these parties have agreed to fund portions of the Company's research and development programs and/or to conduct 
certain research and development relating to specified products, in exchange for certain technology, product and marketing rights 
relating to those products. Some of the Company's current corporate partners have certain rights to control the planning and execution 
of product development and clinical programs, and there can be no assurance that such corporate partners' rights to control aspects of 
such programs will not impede the Company's ability to conduct such programs in accordance with the schedules and in the manner 
currently contemplated by the Company for such programs. 

If any of the Company's corporate collaborators were to terminate its relationship with Vertex, it could have a material adverse effect 
on the Company's ability to fund related and other programs and to develop, manufacture and market any products that may have 
resulted from such collaboration. There can be no assurance that these collaborations will be completed or successful, or that the 
collaborative partners will not pursue alternative means of developing treatments for the diseases targeted by their collaborative 
programs with the Company. Glaxo Wellcome has the right to terminate the research collaboration under its agreement with the 
Company without cause at any time upon twelve months' notice and has the right to terminate the license arrangements under its 
agreement with the Company without cause upon twelve months' notice, provided such notice is not given before the research 
collaboration has been terminated. Termination by Glaxo Wellcome of the research collaboration under its agreement with the 
Company will relieve Glaxo Wellcome of its obligation to 

-25- 
make further research support payments under the agreement. Termination by Glaxo Wellcome of the license arrangements under the 
agreement will relieve it of its obligation to make further commercialization and development milestone and royalty payments and will 
end any license granted to Glaxo Wellcome by Vertex. HMR has the right to terminate its agreement with the Company without cause 
upon twelve months' notice at any time. Termination by HMR will relieve HMR of any further payment obligations under its 
agreement with the Company. In addition, for a period of one year after any such termination, HMR retains the right to select one or 
more compounds for development and to license such compound or compounds from Vertex, provided HMR resumes research 
funding and commercialization milestone payments and makes all such payments that would otherwise have been due but for such 
termination. Alpha has the right to terminate its agreement with the Company without cause upon six months' notice at any time. 
Termination will relieve Alpha of any further payment obligations under its agreement with the Company and will also terminate any 
license granted to Alpha by Vertex. BioChem has the right to terminate its agreement with the Company without cause upon six 
month's notice at any time after May 8, 1997. Termination will relieve BioChem of any further payment obligations under its 
agreement with the Company and will terminate any license granted to BioChem thereunder. 

The Company may seek additional collaborative arrangements to develop and commercialize its products in the future. There can be 
no assurance that the Company will be able to establish acceptable collaborative arrangements in the future or that such collaborative 
arrangements will be successful. In addition, there can be no assurance that collaborative partners will not pursue alternative 
technologies or develop alternative compounds either on their own or in collaboration with others, including the Company's 
competitors, as a means for developing treatments for the diseases targeted by their collaborative programs with the Company or that 
disagreements over rights to technology, other proprietary information or the course of the research and development program will not 
occur. Such events could result in the delay or cancellation of programs or product introduction even if regulatory approvals are 
obtained. See "Business -- Corporate Collaborations." 

   2002.  EDGAR Online, Inc.

RAPID TECHNOLOGICAL CHANGE AND COMPETITION 

The Company is engaged in pharmaceutical fields characterized by extensive research efforts, rapid technological progress and intense 
competition. There are many public and private companies, including pharmaceutical companies, chemical companies and 
biotechnology companies, engaged in developing products for the human therapeutic applications targeted by Vertex. Further, the 
Company believes that interest in the application of structure-based drug design and related technologies may continue and may 
accelerate as the technologies become more widely understood. The Company is aware of efforts by others to develop products in each 
of the areas in which the Company has products in development. For example, Merck & Co., Inc., Abbott Laboratories, Inc. and 
Hoffmann-La Roche have HIV protease inhibitors which have been approved by the FDA for marketing, and Agouron 
Pharmaceuticals, Inc. has filed an NDA for an HIV protease inhibitor. The Company is also aware of other companies that have HIV 
protease inhibitors in development. There also are a number of competitors that have products under development for the treatment of 
MDR in cancer and for the treatment of hemoglobin disorders. In order for the Company to compete successfully in these areas, it 
must demonstrate improved safety, efficacy, ease of manufacturing and market acceptance over its competitors, who have received 
regulatory approval and are currently marketing. Furthermore, academic institutions, governmental agencies and other public and 
private research organizations are conducting research to develop technologies and products that may compete with those under 
development by the Company. In addition, other technologies are, or may in the future become, the basis for competing products. 
There can be no assurance that the Company's competitors will not succeed in developing technologies and products that are more 
effective than any being developed by the Company or that would render the Company's technology and products obsolete or 
noncompetitive. In addition, there can be no assurance that the Company's products in development will be able to compete effectively 
with products which are currently on the market. 

-26- 
Many of the Company's competitors have substantially greater financial, technical and human resources than those of the Company. In 
addition, many of the Company's competitors have significantly greater experience than the Company in conducting preclinical testing 
and human clinical trials of new pharmaceutical products, and in obtaining FDA and other regulatory approvals of products. 
Accordingly, certain of the Company's competitors may succeed in obtaining regulatory approval for products more rapidly than the 
Company. If the Company obtains regulatory approval and commences commercial sales of its products, it will also compete with 
respect to manufacturing efficiency and sales and marketing capabilities, areas in which it currently has no experience. See "Business 
-- Competition." 

MANUFACTURING UNCERTAINTIES; RELIANCE ON THIRD PARTY MANUFACTURERS 

The Company's ability to conduct clinical trials and its ability to commercialize its potential products will depend, in part, on its ability 
to manufacture its products on a large scale, either directly or through third parties, at a competitive cost and in accordance with FDA 
and other regulatory requirements. Furthermore, for all of the Company's drugs in development, completion of clinical trials and 
submission of an NDA will be subject to the establishment of a commercial formulation and manufacturing process. As manufacturing 
process development and formulation activities are ongoing throughout the development process, the Company or its collaborators 
may encounter difficulties at any time that could result in delays in clinical trials, regulatory submissions and commercialization of its 
products, or cause negative financial and competitive consequences. Manufacturing process development and formulation activities for 
VX-478 by the Company and Glaxo Wellcome are continuing while clinical trials are underway. There can be no assurance that such 
activities will be completed in a timely and successful manner, if at all. The failure to complete such activities in a timely and 
successful manner could have a material adverse effect on the business, financial condition or results of operations of the Company. 

The Company currently does not have the capacity to manufacture its potential products and is dependent on third party manufacturers 
or collaborative partners for the production of its compounds for preclinical research and clinical trial purposes. The Company expects 
to be dependent on such manufacturers or collaborative partners for some or all commercial production of any of its compounds that 
are approved for marketing. In the event that the Company is unable to obtain contract manufacturing, or obtain such manufacturing on 
commercially reasonable terms, it may not be able to conduct or complete clinical trials or, if FDA approval is obtained, 
commercialize its products as planned. The Company has no experience in manufacturing pharmaceutical or other products or in 
conducting manufacturing testing programs required to obtain FDA and other regulatory approvals, and there can be no assurance that 
the Company will successfully develop such capabilities. 

Some of the Company's current corporate partners have certain manufacturing rights with respect to the Company's products under 
development, and there can be no assurance that such corporate partners' manufacturing rights will not impede the Company's ability 
to conduct the development programs and commercialize any resulting products in accordance with the schedules and in the manner 
currently contemplated by the Company. See "Business -- Manufacturing." 

EXTENSIVE GOVERNMENT REGULATION; UNCERTAINTY OF PRODUCT CLEARANCE AND APPROVAL 

   2002.  EDGAR Online, Inc.

The FDA and comparable agencies in foreign countries impose substantial requirements on the introduction of therapeutic 
pharmaceutical products through lengthy and detailed laboratory and clinical testing procedures, sampling activities and other costly 
and time-consuming procedures. Satisfaction of these requirements typically takes several years or longer and may vary substantially 
based upon the type, complexity and novelty of the pharmaceutical product. The Company has had only limited experience in 
conducting preclinical testing and human clinical trials. In addition, the 

Company has not received FDA or other regulatory approvals for any of its product candidates. Data obtained from preclinical and 
clinical activities are susceptible to varying interpretations, which could delay, limit or prevent regulatory approval. In addition, delays 
or rejections may be encountered based on changes in, or additions to, regulatory policies for drug approval during the period of 
product development and regulatory review. 

-27- 

The effect of government regulation may be to delay or prevent the commencement of clinical trials or marketing of Company 
products, if any are developed and submitted for approval, for a considerable period of time, to impose costly procedures upon the 
Company's activities and to provide a competitive advantage to larger companies or companies more experienced in regulatory affairs 
that compete with the Company. There can be no assurance that FDA or other regulatory approval for clinical trials or marketing of 
any products developed by the Company will be granted on a timely basis or at all. Delay in obtaining or failure to obtain such 
approvals would adversely affect the marketing of the Company's products and the Company's liquidity and capital resources. 
Moreover, even if approval is granted, such approval may entail limitations on the indicated uses for which a compound may be 
marketed. Even if such regulatory approval is obtained, a marketed drug or compound and its manufacturer are subject to continual 
review, and later discovery of previously unknown problems with a product or manufacturer may result in restrictions on such product 
or manufacturer, including withdrawal of the product from the market. Failure to comply with applicable regulatory requirements can, 
among other things, result in fines, suspensions of regulatory approvals, product recalls, operating restrictions and criminal 
prosecution. Further, additional government regulation may be established which could prevent or delay regulatory approval of the 
Company's products. 

The Company has obtained orphan drug status for VX-366 for the treatment of beta thalassemia and sickle cell disease and may apply 
for orphan drug status for certain indications of MDR in cancer. Orphan drug status may, under present regulations, entitle the 
Company to certain marketing exclusivity and tax benefits. While the marketing exclusivity of an orphan drug would prevent other 
sponsors from obtaining approval of the same compound for the same indication, it would not prevent chemically distinct drugs from 
being approved for the same use. There can be no assurance that the Company will receive FDA orphan drug status for any of its 
compounds under development for which the Company seeks that status. Moreover, there can be no assurance that the scope of 
protection or the level of exclusivity that is currently afforded by orphan drug status will remain in effect in the future. See "Business -- 
Government Regulation." 

The Company's research and development activities involve the controlled use of hazardous materials, chemicals and various 
radioactive compounds. The risk of accidental contamination or injury from these materials cannot be completely eliminated. In the 
event of an accident, the Company could be held liable for any damages or fines that result, and the liability could have a material 
adverse effect on the Company's business, financial condition and results of operations. There can be no assurance that statutes or 
regulations, applicable to the Company's business which impose substantial additional costs or otherwise materially adversely affect 
the Company's operations, will not be adopted. 

UNCERTAINTY RELATED TO PATENTS AND PROPRIETARY INFORMATION 

The Company's success will depend, in part, on its ability to obtain United States and foreign patent protection for its products and 
their uses, to preserve its trade secrets and to operate without infringing the proprietary rights of third parties. Because of the 
substantial length of time and expense associated with bringing new products through development and regulatory approval to the 
marketplace, the pharmaceutical industry places considerable importance on obtaining patents and maintaining trade secret protection 
for new technologies, products and processes. Patent protection may not be available, however, for compounds for use in certain 
medical indications, without a demonstration of how to use the compounds and proof in clinical trials that such 

compounds may be useful for such target indications. As of February 20, 1997, the Company had a total of six United States patents 
and 63 pending United States patent applications. As of that date, the Company also had a non-exclusive, worldwide license under 
certain Searle patent applications claiming HIV protease inhibitors. The Company also has been granted an exclusive license under 
four United States patents, one of which is subject to a reissue application. The Company also has filed foreign counterparts to some of 
its United States patents and patent applications. There can be no assurance that patents will issue from any of the Company's pending 
or future patent applications. There can be no assurance that any issued, licensed, pending or future patent will not be infringed by the 

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   2002.  EDGAR Online, Inc.

products of others or provide sufficient protection to exclude others from the Company's present or future technology or products. The 
Company has in the past licensed and may in the future license patent rights from others. There can be no assurance, however, that 
such licenses will provide adequate protection for the Company's products. 

Issued United States patents are presumed valid under United States patent law. No assurance can be given, however, that one or more 
of the Company's issued patents will not be declared invalid by a court. Legal standards relating to the validity of patents and the 
proper scope of their claims in the biopharmaceutical field are still evolving, and there is no consistent law or policy regarding the 
valid breadth of claims in biopharmaceutical patents or the effect of prior art on them. Furthermore, no assurance can be given as to 
the degree of protection any patents will afford to the Company's technology or as to the Company's ability to avoid infringing the 
claims of the patents held by third parties. Further, there can be no assurance that a license to such patents would be available on terms 
acceptable to the Company, if at all. There also can be no assurance that any patents issued to or licensed by the Company will not be 
infringed by others. 

In addition to being a potential party to patent infringement litigation, the Company could become involved in interference 
proceedings declared by the United States Patent and Trademark Office. Defense and prosecution of patent claims, as well as 
participation in interference proceedings, can be expensive and time-consuming, even in those instances in which the outcome is 
favorable to the Company. If the outcome of any such litigation or proceeding were adverse, the Company could be subject to 
significant liabilities to third parties, could be required to obtain licenses from third parties or could be required to cease sales of the 
affected products, any of which could have a material adverse effect on the Company. 

The Company has licensed on an exclusive basis four United States patents and one United States reissue application from Children's 
Hospital Medical Center of Oakland (California) ("Children's Hospital"). Three of these patents and the reissue application claim the 
use of compounds, including VX-366, in the treatment of hemoglobin disorders, including sickle cell disease and beta thalassemia. 
Because Children's Hospital did not foreign file the application corresponding to the reissue application within one year of filing its 
corresponding United States application, the Company's foreign patent rights may be limited. In addition, there can be no assurance 
that others will not develop independently substantially equivalent technology, obtain access to the Company's know-how or be issued 
patents which may prevent the sale of the Company's products or require licensing and the payment of significant fees or royalties by 
the Company in order for it to carry on its business. Furthermore, there can be no assurance that any such license will be available. 

The Company's management and scientific personnel have been recruited from other pharmaceutical and biotechnology companies 
and academic institutions. In many cases these individuals are conducting research in similar areas with which they were involved prior 
to joining Vertex. As a result, the Company, as well as these individuals, could be subject to allegations of violation of trade secrets 
and similar claims. See " -- Dependence on Collaborative Partners" and "Business - -- Corporate Collaborations" and " -- Patents and 
Proprietary Information." 

FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING 

-29- 

The Company expects to incur substantially increased research and development and related supporting expenses as it designs and 
develops existing and future compounds and undertakes clinical trials of potential drugs resulting from such compounds. The 
Company also expects to incur substantial administrative and commercialization expenditures in the future and substantial expenses 
related to the filing, prosecution, defense and enforcement of patent and other intellectual property claims. The Company's future 
capital requirements will depend on many factors, including the progress of its research and development programs, the scope and 
results of preclinical studies and clinical trials, the cost, timing and outcome of regulatory reviews, the costs involved in filing, 
prosecuting and enforcing patent claims, competing technological and market developments, the establishment of additional 
collaborative arrangements and the cost of manufacturing facilities and of commercialization activities and arrangements. The 
Company anticipates that it will finance these substantial cash needs with its existing cash reserves, together with interest earned 
thereon, future payments under its collaborative agreements with Glaxo Wellcome, HMR, Kissei, Alpha and BioChem, facilities and 
equipment financing and additional collaborative agreements. To the extent that funds from these sources are not sufficient to fund the 
Company's activities, it will be necessary to raise additional funds through public offerings or private placements of debt or equity 
securities or other methods of financing. Any equity financings could result in dilution to the Company's then existing stockholders. 
Any debt financing, if available at all, may be on terms which, among other things, restrict the Company's ability to pay dividends 
(although the Company does not intend to pay dividends for the foreseeable future). If adequate funds are not available, the Company 
may be required to curtail significantly or discontinue one or more of its research, drug discovery or development programs, including 
clinical trials, or attempt to obtain funds through arrangements with collaborative partners or others that may require the Company to 
relinquish rights to certain of its technologies or products in research or development. No assurance can be given that additional 
financing will be available on acceptable terms, if at all. See "Management's Discussion and Analysis of Financial Condition and 
Results of Operations." 

   2002.  EDGAR Online, Inc.

HISTORY OF OPERATING LOSSES AND ACCUMULATED DEFICIT 

Vertex has incurred losses since its inception in January 1989. As of December 31, 1996, the Company's accumulated deficit was 
approximately $96.9 million. Losses have resulted principally from costs incurred in research and development of the Company's 
compounds in development, including clinical trials and material manufacturing costs, the Company's other research programs and 
from general and administrative costs. These costs have exceeded the Company's revenues, which to date have been generated 
primarily from collaborative arrangements, interest income and research grants. The Company expects to incur additional significant 
operating losses in the future and does not expect to achieve profitability from sales of its products in development for several years, if 
ever. The Company expects that losses will fluctuate from quarter to quarter and that such fluctuations may be substantial. There can 
be no assurance that the Company will ever achieve product revenues or profitable operations. Based on the Internal Revenue Code of 
1986, as amended, and changes in the Company's ownership, utilization of net operating loss carryforwards and research and 
development credits for federal income tax purposes may be subject to annual limitations. See "Management's Discussion and 
Analysis of Financial Condition and Results of Operations." 

UNCERTAINTY RELATED TO PHARMACEUTICAL PRICING AND REIMBURSEMENT 

The Company's ability to commercialize its products successfully will depend in part on the extent to which appropriate 
reimbursement levels for the cost of such products and related treatment are obtained from government authorities, private health 
insurers and other organizations, such as health maintenance organizations ("HMOs"). Third party payors and government 

-30- 

authorities are continuing efforts to contain or reduce the cost of health care. For example, in certain foreign markets, pricing and/or 
profitability of prescription pharmaceuticals are subject to government control. There can be no assurance that similar controls will not 
be implemented in the United States. Also, the trend toward managed health care in the United States and the concurrent growth of 
organizations such as HMOs, which could control or significantly influence the purchase of health care services and products, may 
result in lower prices for the Company's products. The cost containment measures that health care providers and third party payors are 
instituting and any proposed or future health care reform measures, including any reductions in government reimbursement programs 
such as Medicaid and Medicare, could affect the Company's ability to sell its products and may have a material adverse effect on the 
Company. 

The success of the Company's products in the United States and other significant markets will depend, in part, upon the extent to which 
a consumer will be able to obtain reimbursement for the cost of such products from government health administration authorities, 
third-party payors and other organizations. Significant uncertainty exists as to the reimbursement status of newly approved therapeutic 
products. Even if a product is approved for marketing, there can be no assurance that adequate reimbursement will be available. The 
Company is unable to predict what additional legislation or regulation relating to the health care industry or third-party coverage and 
reimbursement may be enacted in the future or what effect the legislation or regulation would have on the Company's business. Failure 
to obtain reimbursement could have a material adverse effect on the Company. 

ABSENCE OF SALES AND MARKETING EXPERIENCE 

The Company currently has no experience in marketing or selling pharmaceutical products. The Company must either develop a 
marketing and sales force or enter into arrangements with third parties to market and sell any of its product candidates which are 
approved by the FDA. In the territories where the Company retains marketing and co-promotion rights, there can be no assurance that 
the Company will successfully develop its own sales and marketing experience or that it will be able to enter into marketing and sales 
agreements with others on acceptable terms, if at all. If the Company develops its own marketing and sales capability, it will compete 
with other companies that currently have experienced and well-funded marketing and sales operations. To the extent that the Company 
has or enters into co-promotion or other sales and marketing arrangements with other companies, any revenues to be received by the 
Company will be dependent on the efforts of others, and there can be no assurance that such efforts will be successful. 

DEPENDENCE ON KEY MANAGEMENT AND QUALIFIED PERSONNEL 

The Company is highly dependent upon the efforts of its senior management and scientific team. The loss of the services of one or 
more members of the senior management and scientific team might impede the achievement of the Company's development objectives. 
Due to the specialized scientific nature of the Company's business, the Company is also highly dependent upon its ability to attract and 
retain qualified scientific, technical and key management personnel. There is intense competition for qualified personnel in the areas of 
the Company's activities, and there can be no assurance that the Company will be able to continue to attract and retain qualified 
personnel necessary for the development of its existing business and its expansion into areas and activities requiring additional 
expertise, such as clinical testing, government approvals, production and marketing. See "Human Resources." 

   2002.  EDGAR Online, Inc.

PRODUCT LIABILITY AND AVAILABILITY OF INSURANCE 

The Company's business will expose it to potential product liability risks that are inherent in the testing, manufacturing and marketing 
of pharmaceutical and other products developed by the Company. The use of the Company's products in clinical trials also exposes the 
Company to the 

possibility of product liability claims and possible adverse publicity. These risks will increase to the extent the Company's products 
receive regulatory approval and are commercialized. The Company maintains product liability insurance for clinical trials. The 
Company does not currently have any other product liability insurance. There can be no assurance that the Company will be able to 
maintain its existing insurance or be able to obtain or maintain such additional insurance as it may need in the future on acceptable 
terms or that the Company's existing insurance or any such additional insurance will provide adequate coverage against potential 
liabilities. 

-31- 

VOLATILITY OF SHARE PRICE; OPTION GRANTS 

Market prices for securities of companies such as Vertex are highly volatile, and the market for the securities of such companies, 
including the Common Stock of the Company, has from time to time experienced significant price and volume fluctuations that are 
unrelated to the operating performance of these particular companies. Factors such as announcements of results of clinical trials, 
technological innovations or new products by Vertex or its competitors, government regulatory action, public concern as to the safety 
of products developed by the Company or others, patent or proprietary rights developments and market conditions for pharmaceutical 
and biotechnology stocks, in general, could have a significant adverse effect on the future market price of the Common Stock. 

As of December 31, 1996, the Company had outstanding options for the purchase of 4,032,609 shares of Common Stock at exercise 
prices ranging from $6.48 per share to $37.50 per share. Options for the purchase of 1,624,862 shares of Common Stock were 
exercisable as of that date. 

ANTI-TAKEOVER PROVISIONS 

The Company's charter provides for staggered terms for the members of the Board of Directors. The Company's By-laws grant the 
Directors a right to adjourn annual meetings of stockholders, and certain provisions of the By-laws may be amended only with an 80% 
stockholder vote. Pursuant to the Company's Stockholder Rights Plan, as amended as of February 21, 1997, each share of Common 
Stock has an associated preferred share purchase right (a "Right"). The Rights will not trade separately from the Common Stock until, 
and are exercisable only upon, the acquisition or the potential acquisition through tender offer by a person or group of 15% or more of 
the outstanding Common Stock. These charter and By-law provisions and the Company's Stockholder Rights Plan may discourage 
certain types of transactions involving an actual or potential change in control of the Company which might be beneficial to the 
Company or its stockholders. 

Shares of any class or series of preferred stock may be issued by the Company in the future without stockholder approval and upon 
such terms as the Board  of Directors may determine. The rights of the holders of Common Stock will be subject to, and may be 
adversely affected by, the rights of the holders of any class or series of preferred stock that may be issued in the future. The issuance of 
preferred stock, while providing desirable flexibility in connection with possible acquisitions and other corporate purposes, could have 
the effect of discouraging a third party from acquiring a majority of the outstanding Common Stock of the Company. The Company 
has no present plans to issue any shares of any class or series of Preferred Stock. 

ITEM 2. PROPERTIES 

-32- 

The Company leases an aggregate of approximately 110,000 square feet of laboratory and office space in five adjacent facilities at 40 
Allston Street, 625 Putnam Avenue, 618 Putnam Avenue, 240 Sidney Street and 130 Waverly Street in Cambridge, Massachusetts. 
The lease to the 40 Allston Street, 618 Putnam Avenue and 240 Sidney Street facilities will expire in December 2003. The lease to the 
625 Putnam Avenue facility expires in December 1998, subject to an option, at the Company's election, to extend the term through 
December 2000. The lease to the 130 Waverly Street facility will expire in December 2005. The Company has occupied 
approximately 53,000 square feet of space under this lease, with approximately 7,000 square feet of additional space available for 
expansion. The Company believes its facilities are adequate for its current needs. The Company believes it can obtain additional space 
on commercially reasonable terms. 

ITEM 3. LEGAL PROCEEDINGS 

   2002.  EDGAR Online, Inc.

The Company is not a party to any material legal proceedings. 

ITEM 4. SUBMISSION OF MATTERS TO SECURITY HOLDERS 

There were no matters submitted to a vote of security holders during the fourth quarter of the fiscal year ended December 31, 1996. 

PART II 

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS 

The Company's Common Stock trades on the Nasdaq Stock Market ("Nasdaq") under the symbol "VRTX." The following table sets 
forth the high and low last sale prices for each quarter and the last sale price at the end of each quarter for the Common Stock as 
reported by Nasdaq for the periods indicated. 

1995                         HIGH           LOW             CLOSE 
- ------------------------------------------------------------------

First quarter               $16 3/4       $13              $13 1/2 
Second quarter               16 3/4        12 3/4           16 3/8 
Third quarter                23            13 1/2           18 3/4 
Fourth quarter               26 1/2        16 1/4           26 1/2 

1996 
- ------------------------------------------------------------------

First quarter               $29 7/8       $22              $26 1/2 
Second quarter               38            26               30 3/8 
Third quarter                36 1/4        23 1/4           29 1/2 
Fourth quarter               40 1/4        28 7/8           40 1/4 

The last sale price of the Common Stock on March 6, 1997, as reported by Nasdaq, was $46.00 per share. As of March 5, 1997, there 
were 297 holders of record of the Common Stock (approximately 5,200 beneficial holders). 

The Company has never declared or paid any cash dividends on its Common Stock and currently expects that future earnings will be 
retained for use in its business. 

RECENT SALE OF UNREGISTERED SECURITIES 

-33- 

On June 28, 1996, the Company issued and sold to Glaxo Wellcome, for cash, 151,792 shares of the Company's Common Stock at a 
purchase price of $32.94 per share, or an aggregate purchase price of $5,000,028. The securities issued were not registered under the 
Securities Act of 1933, as amended (the "Securities Act"), in reliance on the exemption set forth in Section 4(2) of the Securities Act. 
The sale to Glaxo Wellcome was a privately negotiated sale by the Company not involving any public offering. 

ITEM 6. SELECTED CONSOLIDATED FINANCIAL DATA 

-34- 

The following selected consolidated financial data for each of the five years in the period ended December 31, 1996 are derived from 
the Company's Consolidated Financial Statements audited by Coopers & Lybrand L.L.P., independent accountants. This data should 
be read in conjunction with the Company's audited financial statements and related notes, and "Management's Discussion and Analysis 
of Financial Condition and Results of Operations." No dividends were declared or paid for any of the periods presented. 

   2002.  EDGAR Online, Inc.

                                                                                      YEAR ENDED DECEMBER 31, 
                                                      ------------------------------------------------------------------------ 
                                                      *Proforma 
                                                            1996        1996           1995          1994           1993        1992 
                                                      ---------      --------      --------      --------     -------     -------- 
                                                                          (IN THOUSANDS, EXCEPT PER SHARE  AMOUNTS) 
Consolidated Statement of Operations Data: 
Revenues: 
  Collaborative and other research and 
development revenues .....................     $ 13,341      $ 13,341      $ 22,081      $ 19,571     $27,885     $  3,767 
  Interest income ........................         5,257         5,257          5,453         3,574         1,409        1,983 
                                                       --------      --------      --------      --------     -------     -------- 
           Total revenues ..................       18,598        18,598         27,534        23,145       29,294        5,750 
Costs and expenses: 
  Research and development ...............       35,212        35,212         41,512        34,761       23,164       11,505 
  General and administrative .............         7,929         7,929          7,069         5,540         3,520        2,278 
  License Payment ........................       15,000        15,000             --             --           --            -- 
  Interest ...............................           462            462            481            439          493           453 
                                                       --------      --------      --------      --------     -------     -------- 
           Total costs and expenses ........       58,603        58,603         49,062        40,740       27,177       14,236 
                                                       --------      --------      --------      --------     -------     -------- 
Net (loss) profit before taxes ...........      (40,005)      (40,005)     (21,528)      (17,595)       2,117       (8,486) 
Tax provision ............................            --             --             --             --           80            -- 
                                                       --------      --------      --------      --------     -------     -------- 
Net (loss) profit ........................     $(40,005)     $(40,005)    $(21,528)     $(17,595)    $ 2,037     $ (8,486) 
                                                       ========      ========      ========      ========     =======     ======== 
Net (loss) profit per common share .......     $   (2.13)     $  (2.13)    $  (1.25)     $  (1.11)    $  0.16     $  (0.70) 
Weighted average number of common 
shares outstanding .......................       18,798        18,798         17,231        15,818       12,451       12,110 

                                                                                                 DECEMBER 31, 
                                                        ---------------------------------------------------------------------------- 
                                                        *Proforma 
                                                              1996          1996          1995            1994           1993          1992 
                                                        ---------      ---------      --------     ---------      --------      -------- 
Consolidated Balance Sheet Data: 
Cash, cash equivalents and short-term 
investments ...............................    $ 279,222      $ 130,359      $ 86,978     $ 106,470      $ 52,103      $ 43,701 
Total assets ..............................        292,362        143,499        98,981        116,175         60,992        51,043 
Obligations under capital leases, excluding 
  current portion .........................          5,617           5,617         4,912           4,729          4,208         3,338 
Accumulated deficit .......................       (96,944)       (96,944)      (56,939)       (35,411)     (17,816)      (19,853) 
Total stockholders' equity . ..............       279,689        130,826        85,272        105,478         49,520        43,850 

*To give effect to the sale of 3,450,000 shares of common stock in a public offering on March 12, 1997, with net proceeds to the 
Company of approximately $148,863,000 (see Note N to the Financial Statements). 

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF 
OPERATIONS 

The Company is engaged in the discovery, development and commercialization of novel, small molecule pharmaceuticals for the 
treatment of major diseases for which there are currently limited or no effective treatments. The Company is a leader in the use of 
structure-based drug design, an approach to drug discovery that integrates advanced biology, biophysics and chemistry. 

The Company is conducting nine significant pharmaceutical research and development programs to develop pharmaceuticals for the 
treatment of viral diseases, multidrug resistance in cancer, hemoglobin disorders, autoimmune diseases, inflammatory diseases and 
neurodegenerative disorders. Three of these programs are in the development phase, and the other six are in the research phase. 

-35- 

To date, the Company has not received any revenues from the sale of pharmaceutical products and does not expect to receive such 
revenues, if any, in the near future. The Company has incurred since its inception, and expects to incur over the next several years, 
significant operating losses as a result of expenditures for its research and development programs. The Company expects that losses 
will fluctuate from quarter to quarter and that such fluctuations may be substantial. 

RESULTS OF OPERATIONS 
Year Ended December 31, 1996 Compared with Year Ended December 31, 1995. 

The Company's total revenues decreased to $18,598,000 in 1996 from $27,534,000 in 1995. In 1996, revenues consisted of 
$12,013,000 under the Company's collaborative agreements, $5,257,000 in interest earned on invested funds and $1,328,000 in 
government grants and other income. Revenue from collaborative agreements consisted of $6,289,000 from the Glaxo Wellcome 
collaboration, $4,196,000 from the HMR collaboration, $692,000 from the Kissei collaboration, $225,000 from the Alpha 
collaboration, $577,000 from the BioChem collaboration and $34,000 from the Chugai collaboration. The research funding 

   2002.  EDGAR Online, Inc.

requirements of the Chugai and Kissei collaborative agreements concluded in 1995, although Kissei continues to have certain 
development funding obligations. In 1995, revenues consisted of $21,587,000 under the Company's collaborative agreements, 
$5,453,000 in interest earned on invested funds and $494,000 in government grants and other income. Revenue from collaborative 
agreements consisted of $10,053,000 from the Glaxo Wellcome collaboration, $5,370,000 from the Kissei collaboration, $3,749,000 
from the HMR collaboration, $1,915,000 from the Chugai collaboration and $500,000 from the Alpha collaboration. 

The Company's total costs and expenses increased to $58,603,000 in 1996 from $49,062,000 in 1995. The increase in total costs and 
expenses resulted principally from the Company's payment of $15,000,000 to obtain a non-exclusive, world-wide license under certain 
Searle patent applications claiming HIV protease inhibitors. Research and development expenses declined to $35,212,000 in 1996 
from $41,512,000 in 1995. Although the Company's scientific staffing and facilities expansion added to expense in 1996, the overall 
decrease in research and development expense was due primarily to higher costs incurred in 1995 for the manufacturing of bulk 
intermediate drug substance for use in clinical trials. In addition, general and administrative expenses increased to $7,929,000 in 1996 
from $7,069,000 in 1995. The increase in general and administrative expense principally reflects the impact of personnel additions, the 
Company's facilities expansion, and an increase in marketing costs including the addition of marketing and support personnel for the 
Company's subsidiary Altus Biologics Inc. ("Altus"). Interest expense decreased to $462,000 in 1996 from $481,000 in 1995 on 
higher levels of equipment lease financing due to lower blended rates of interest charged. 

-36- 
The Company recorded a net loss of $40,005,000 or $2.13 per share in 1996 compared to a net loss of $21,528,000 or $1.25 per share 
in 1995. 

Year Ended December 31, 1995 Compared with Year Ended December 31, 1994. 

The Company's total revenues increased to $27,534,000 in 1995 from $23,145,000 in 1994. In 1995, revenues consisted of 
$21,587,000 under the Company's collaborative agreements, $5,453,000 in interest earned on invested funds and $494,000 in 
government grants and other income. Revenue from collaborative agreements consisted of $10,053,000 from the Glaxo Wellcome 
collaboration, $5,370,000 from the Kissei collaboration, $3,749,000 from the HMR collaboration, $1,915,000 from the Chugai 
collaboration and $500,000 from the Alpha collaboration. The research funding requirements of the Chugai and Kissei collaborative 
agreements concluded in 1995, although Kissei continues to have certain development funding obligations. In 1994, revenues 
consisted of $19,327,000 from collaborative agreements, $3,574,000 in interest earned on invested funds and $244,000 in government 
grants and other income. Revenue in 1994 from collaborative agreements consisted of $5,346,000 from the Glaxo Wellcome 
collaboration, $5,498,000 from the Kissei collaboration, $3,514,000 from the HMR collaboration and $4,969,000 from the Chugai 
collaboration. 

The Company's total costs and expenses increased to $49,062,000 in 1995 from $40,740,000 in 1994. Research and development 
expenses increased 19% to $41,512,000 in 1995 from $34,761,000 in 1994, due, in part, to the costs associated with manufacturing 
drug product for use in ongoing clinical trials of the Company's drug candidates and, to a lesser extent, increases in the Company's 
research staff. General and administrative expenses increased by 28% to $7,069,000 from $5,540,000 between 1995 and 1994. The 
increase in general and administrative expense principally reflects the full year impact of personnel additions and the opening of an 
office in the United Kingdom in 1994 to support the Company's research and business development efforts. Also contributing to the 
increase were costs associated with the addition of marketing and support personnel for Altus. In addition, the Company experienced 
higher legal fees associated with its patent activities. Interest expense increased 10% to $481,000 in 1995 from $439,000 in 1994 as a 
result of higher levels of equipment leasing. 

The Company recorded a net loss of $21,528,000 or $1.25 per share in 1995 compared to a net loss of $17,595,000 or $1.11 per share 
in 1994. 

LIQUIDITY AND CAPITAL RESOURCES 

The Company's operations have been funded principally through strategic collaborative agreements, public offerings and private 
placements of the Company's equity securities, equipment lease financing, government grants and interest income. The Company 
expects to incur increased research and development and related supporting expenses and, consequently, continued losses on a 
quarterly and annual basis as it continues to develop existing and future compounds and to conduct clinical trials of potential drugs. 
The Company also expects to incur substantial administrative and commercialization expenditures in the future and additional 
expenses related to the filing, prosecution, defense and enforcement of patent and other intellectual property rights. 

The Company expects to finance these substantial cash needs with its existing cash and investments at December 31, 1996 of 
approximately $130.4 million ($279.2 million pro forma for the public offering of 3,450,000 shares of common stock on March 12, 
1997), together with interest earned thereon, future payments under its existing collaborative agreements, and facilities and equipment 

   2002.  EDGAR Online, Inc.

financing. To the extent that funds from these sources are not sufficient to fund the Company's activities, it will be necessary to raise 
additional funds through public offerings or private placements of securities or other methods of financing. There can be no assurance 
that such financing will be available on acceptable terms, if at all. 

-37- 
The Company and BioChem are collaborating on the development and commercialization in Canada of VX-710, the Company's lead 
multidrug resistance reversal agent. Under the development agreement, BioChem is obligated to pay the Company up to $4.0 million 
comprised of an initial licensing fee and payments for development and commercialization milestones. From the inception of the 
agreement in May 1996 through the year ended December 31, 1996, $500,000 has been recognized as revenue. BioChem will fund 
development of VX-710 in Canada, including planned Phase II clinical trials in two different cancer indications. Vertex will supply 
BioChem clinical and commercial drug supply needs. In 1996, the Company received additional revenues related to the sale of clinical 
trial material to BioChem. BioChem will pay Vertex a portion of its net sales, which will cover Vertex's cost of supplying material and 
will provide a profit to Vertex. 

The Company and Alpha are collaborating on the development and commercialization of VX-366 for the treatment of sickle cell 
anemia and beta thalassemia. Under the collaborative agreement, Alpha is obligated to pay the Company up to $5.0 million comprised 
of an initial license fee and payments for development and commercialization milestones. From the inception of the agreement in 
October 1995 through the year ended December 31, 1996, $500,000 has been recognized as revenue. In addition, Alpha is obligated to 
bear the costs of development of VX-366 under the collaboration. The Company received additional revenue related to 
reimbursements for clinical material during 1996. Alpha has the right to terminate the agreement without cause upon six months notice 
at any time. Termination will relieve Alpha of any further payment obligations under the agreement and will end the license granted to 
Alpha by Vertex. 

The Company and Glaxo Wellcome are collaborating on the development of compounds in connection with the Company's HIV 
Program. Under the collaborative agreement, Glaxo Wellcome is obligated to pay the Company up to $42.0 million comprised of a 
$15.0 million initial license payment paid in 1993, $14.0 million of product research funding over five years and $13.0 million of 
development and commercialization milestone payments. From the inception of the agreement in December 1993 through the year 
ended December 31, 1996, $25.0 million has been recognized as revenue. Glaxo Wellcome is also obligated to pay to Vertex 
additional development and commercialization milestone payments for subsequent drug candidates. In addition, Glaxo Wellcome 
agreed to bear the costs of development of drug candidates under the collaboration. The Company has received additional revenue 
related to reimbursements for clinical development. Under the agreement, Glaxo Wellcome is also required to pay Vertex a royalty on 
sales. Glaxo Wellcome has the right to terminate the research collaboration without cause upon twelve months notice given at any time 
and has the right to terminate the license arrangements without cause upon twelve months notice given at any time provided such 
notice is not given before the research collaboration has been terminated. Termination by Glaxo Wellcome of the research 
collaboration will relieve Glaxo Wellcome of its obligation to make further research support payments under the agreement. 
Termination by Glaxo Wellcome of the license arrangements under the agreement will relieve it of its obligation to make further 
commercialization and development milestone and royalty payments and will end any license granted to Glaxo Wellcome by Vertex 
thereunder. In June 1996, the Company and Glaxo Wellcome obtained a worldwide, non-exclusive license under certain Searle patent 
applications in the area of HIV protease inhibition. Vertex paid $15.0 million and Glaxo Wellcome paid $10.0 million to Searle for the 
license. The Company also agreed to pay Searle a royalty on sales of VX-478, the Company's lead HIV compound. In connection with 
this transaction, a $5.0 million equity investment was made to the Company by Glaxo Wellcome. 

The Company and HMR are collaborating on the development of interleukin-1 beta converting enzyme inhibitors as anti-inflammatory 
agents. Under the collaborative agreement, HMR is obligated to pay the Company up to $30.5 million, comprised of $18.5 million of 
product research funding over five years and $12.0 million of development and commercialization milestone payments. From the 
inception of the agreement in September 1993 through the year ended December 31, 1996, $14.5 million has been recognized as 
revenue. HMR has the right to terminate the agreement without cause upon twelve months notice at any time. For a period of one year 
after 

any such termination, HMR retains the right to select one or more compounds for development and to license such compound or 
compounds from Vertex, provided HMR resumes all research funding and commercialization milestone payments and makes all such 
payments that would otherwise have been due but for such termination. Otherwise, in the case of such termination, all rights to 
compounds developed under the research and license agreements will revert to Vertex. 

-38- 

The Company and Kissei are collaborating on the development of Vertex's VX-478 protease inhibitor. Under the collaborative 
agreement, Kissei is obligated to pay the Company up to $20.0 million, comprised of $9.8 million of product research funding through 
1995, $7.0 million of development milestone and territory option payments and a $3.2 million equity investment. From the inception 
of the agreement in April 1993 through the year ended December 31, 1996, $17.8 million has been received, including $14.6 million 

   2002.  EDGAR Online, Inc.

recognized as revenue and $3.2 million as an equity investment. The Company received additional revenue related to reimbursements 
for clinical development during this period. Under the collaboration, Kissei is also required to pay Vertex a royalty on sales. 

In March 1997, the Company completed a public offering of 3,450,000 shares of its common stock, which included an over-allotment 
exercised by the underwriters for 450,000 shares, at a price to the public of $45.50 per share, with net proceeds to the Company of 
approximately $148,863,000. In August 1996, the Company completed a public offering of 3,450,000 shares of its common stock, 
which included an over-allotment option exercised by the underwriters for 450,000 shares, at a price to the public of $24 per share, 
with net proceeds to the Company of approximately $77,515,000. In June 1996, Glaxo Wellcome purchased 151,792 shares of the 
Company's common stock at a price of $32.94 per share, with net proceeds to the Company of approximately $5.0 million. In 
November 1994, the Company sold 1,200,000 shares of common stock in a private placement to a subsidiary of BB Biotech AG at a 
price of $12.50 per share, with net proceeds to the Company of approximately $15,000,000. In February 1994, the Company sold 
3,450,000 shares of common stock in a public offering at a price to the public of $18.00 per share, with net proceeds to the Company 
of approximately $58,062,000. 

In March 1995, the Company signed a ten-year operating lease for additional facilities for occupancy in early 1996. The Company has 
occupied approximately 53,000 square feet of space under this lease and has agreed to occupy approximately 60,000 square feet in 
total during the lease period in order to meet its longer-term expansion needs. The costs to lease and equip these facilities will be 
funded, in whole or in part, through existing cash and investments and through lease financing, which has been made available to the 
Company on acceptable terms. During 1995, the Company deposited $2,316,000 with its bank to collateralize a conditional letter of 
credit in the name of the landlord. The letter of credit is redeemable only if the Company defaults on the lease under specific criteria. 
These funds are restricted from the Company's use, although the Company is entitled to all interest earned on the funds. The Company 
expects to continue its current practice of leasing most of its capital equipment, provided such lease financing continues to be available 
to the Company on commercially acceptable terms. 

The Company's aggregate cash and investments were $130,359,000 at December 31, 1996, an increase of $43,381,000 from 
December 31, 1995. Cash used by operations was $40,253,000 in the year ended December 31, 1996. The Company expended 
$3,983,000 to acquire property and equipment, principally for research equipment and facilities. To fund these expenditures, the 
Company entered into equipment lease financing in the aggregate amount of $3,727,000. In addition, the Company repaid $2,187,000 
of its lease obligations during 1996. 

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA 

The information required by Item 8 is contained on pages F-1 though F-17 of this report. 

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS AND FINANCIAL DISCLOSURE 

-39- 

Not applicable. 

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT 

PART III 

The information regarding directors required by this Item is included in the definitive Proxy Statement for the Company's 1997 Annual 
Meeting of Stockholders, to be filed with the Commission on or about April 7, 1997 (the "1997 Proxy Statement"), under "Election of 
Directors" and is incorporated herein by reference. The information regarding executive officers required by this Item is included in 
Part I of this Annual Report on Form 10-K. 

ITEM 11. EXECUTIVE COMPENSATION 

The information required by this Item is included in the 1997 Proxy Statement under "Executive Compensation" and is incorporated 
herein by reference (excluding, however, the "Report on Executive Compensation" and the Performance Graph contained in the 1997 
Proxy Statement, which shall not be deemed incorporated herein). 

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT 

The information required by this Item is included in the 1997 Proxy Statement under "Security Ownership of Certain Beneficial 
Owners and Management" and is incorporated herein by reference. 

   2002.  EDGAR Online, Inc.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS 

Not applicable. 

-40- 
PART IV 

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K 

(a)(1) FINANCIAL STATEMENTS. The Financial Statements required to be filed by Item 8 of this Annual Report on Form 10-K, 
and filed herewith, are as follows: 

                                                          Page Number 
in 
                                                          this Form 
10-K 

-------------- 
Report of Independent Accountants ..........................    F-2 

Consolidated Balance Sheets as of December 31, 1996 and 1995    F-3 

Consolidated Statements of Operations for the years ended 
December 31, 1996, 1995 and 1994 ...........................    F-4 

Consolidated Statements of Stockholders' Equity for the 
years ended December 31, 1996, 1995 and 1994 ...............    F-5 

Consolidated Statements of Cash Flows for the years ended 
December 31, 1996, 1995 and  1994 ..........................    F-6 

Notes to Consolidated Financial Statements .................    F-7 

(a)(2) FINANCIAL STATEMENT SCHEDULES. 

Financial Statement Schedules have been omitted because they are either not applicable or the required information is included in the 
consolidated financial statements or notes thereto. 

   2002.  EDGAR Online, Inc.

                                                          
(a)(3) EXHIBITS. 

EXHIBIT                       EXHIBIT 
NUMBER                        DESCRIPTION 
- ------                        ----------- 

3.1      Restated Articles of Organization (filed as Exhibit 3.1 to the 
         Company's Registration Statement on Form S-1 (Registration No. 
         33-43874) and incorporated herein by reference). 

3.2      Articles of Amendment filed with the Commonwealth of Massachusetts on 
         May 17, 1995 (filed as Exhibit 3.1 to the Company's Quarterly Report 
on 
         Form 10-Q for the quarter ended June 30, 1995 (File No. 0-19319) and 
         incorporated herein by reference). 

3.3      By-laws of the Company (filed as Exhibit 3.2 to the Company's 
         Registration Statement on Form S-1 (Registration No. 33-43874) and 
         incorporated herein by reference). 

3.4      Certificate of Vote of Directors Establishing a Series of a Class of 
         Stock, as filed with the Secretary of the Commonwealth of 
Massachusetts 
         on July 31, 1991 (filed as Exhibit 3.3 to the Company's Registration 
         Statement on Form S-1 (Registration No. 33-43874) and incorporated 
         herein by reference). 

-41- 

   2002.  EDGAR Online, Inc.

4.1      Specimen stock certificate (filed as Exhibit 4.1 to the Company's 
         Registration Statement on Form S-1 (Registration No. 33-40966) or 
         amendments thereto and incorporated herein by reference). 

4.2      Stockholder Rights Plan (filed as Exhibit 4.2 to the Company's 
         Registration Statement on Form S-1 (Registration No. 33-40966) or 
         amendments thereto and incorporated herein by reference). 

4.3      First Amendment to Rights Agreement dated as of February 21, 1997 
         (filed herewith). 

10.1     1991 Stock Option Plan, as amended and restated as of May 13, 1993 
         (filed as Exhibit 28.1 to the Company's Registration Statement on Form 
         S-8 (No. 33-65742) and incorporated herein by reference).* 

10.2     1994 Stock and Option Plan (filed as Exhibit 10.2 to the Company's 
1994 
         Annual Report on Form 10-K (File No. 0-19319) and incorporated herein 
         by reference).* 

10.3     1996 Stock and Option Plan (filed herewith). 

10.4     Non-Competition and Stock Repurchase Agreement between the Company and 
         Joshua Boger, dated April 20, 1989 (filed as Exhibit 10.2 to the 
         Company's Registration Statement on Form S-1 (Registration No. 
         33-40966) or amendments thereto and incorporated herein by 
reference).* 

10.6     Form of Employee Stock Purchase Agreement (filed as Exhibit 10.3 to 
the 
         Company's Registration Statement on Form S-1 (Registration No. 
         33-40966) or amendments thereto and incorporated herein by 
reference).* 

10.7     Form of Employee Non-Disclosure and Inventions Agreement (filed as 
         Exhibit 10.4 to the Company's Registration Statement on Form S-1 
         (Registration No. 33-40966) or amendments thereto and incorporated 
         herein by reference). 

10.8     Form of Executive Employment Agreement executed by Richard H. Aldrich, 
         Joshua S. Boger, and Vicki L. Sato (filed as Exhibit 10.6 to the 
         Company's 1994 Annual Report on Form 10-K (File No. 0-19319) and 
         incorporated herein by reference).* 

10.9     Form of Amendment to Employment Agreement executed by Richard H. 
         Aldrich, Joshua S. Boger and Vicki L. Sato  (filed as Exhibit 10.1 to 
         the Company's Quarterly Report on Form 10-Q for the quarter ended June 
         30, 1995 (File No. 0-19319) and incorporated herein by reference). 

10.10    Series C Convertible Preferred Stock Purchase Agreement between the 
         Company and the party named therein, dated September 21, 1990 (filed 
as 
         Exhibit 10.8 to the Company's Registration Statement on Form S-1 
         (Registration No. 33-40966) or amendments thereto and incorporated 
         herein by reference). 

10.11    Stock Purchase Agreement dated November 10, 1994 between the Company 
         and Biotech Target S.A. (filed as Exhibit 10.12 to the Company's 1994 
         Annual Report on Form 10-K (File No. 0-19319) and incorporated herein 
         by reference). 

10.12    Lease dated October 1, 1992 between C. Vincent Vappi and the Company 
         relating to the premises at 40 Allston Street, 618 Putnam Street, 228 
         Sidney Street, and 240 Sidney Street (filed as Exhibit 10.14 to the 
         Company's Annual Report on Form 10-K for the year ended December 31, 
         1992 (File No. 0-19319) and incorporated herein by 

   2002.  EDGAR Online, Inc.

-42- 

   2002.  EDGAR Online, Inc.

         reference). 

10.13    First Amendment as of March 1, 1995 to the lease between C. Vincent 
         Vappi and the Company (filed as Exhibit 10.2 to the Company's 
Quarterly 
         Report on Form 10-Q for the quarter ended June 30, 1995 (File No. 
         0-19319) and incorporated herein by reference). 

10.14    Second Amendment as of February 12, 1997 to Lease between C. Vincent 
         Vappi and the Company (filed herewith). 

10.15    Lease dated March 1, 1993, between Fort Washington Realty Trust and 
the 
         Company, relating to the premises at 625 Putnam Avenue, Cambridge, MA 
         (filed as Exhibit 10.10 to the Company's Annual Report on Form 10-K 
for 
         the year ended December 31, 1993 (File No. 0-19319) and incorporated 
         herein by reference). 

10.16    First Amendment, dated 1 December 1996, to Lease between Fort 
         Washington Realty Trust and the Company dated 1 March 1993 (filed 
         herewith). 

10.17    Lease dated March 3, 1995, between Fort Washington Realty Trust and 
the 
         Company, relating to the premises at 130 Waverly Street, Cambridge, MA 
         (filed as Exhibit 10.15 to the Company's 1994 Annual Report on Form 
         10-K (File No. 0-19319) and incorporated herein by reference). 

10.18    First Amendment to Lease dated March 3, 1995 between Fort Washington 
         Realty Trust and the Company (filed as Exhibit 10.15 to the Company's 
         1995 Annual Report on Form 10-K (File No. 0-19319) and incorporated 
         herein by reference). 

10.19    Research and Development Agreement dated April 13, 1993 between the 
         Company and Kissei Pharmaceutical Co., Ltd. (with certain confidential 
         information deleted) (filed as Exhibit 10.1 to the Company's Quarterly 
         Report on Form 10-Q for the quarter ended March 31, 1993 (File No. 
         0-19319) and incorporated herein by reference). 

10.20    Research, Development, and License Agreement dated September 8, 1993 
         between the Company and Roussel Uclaf (with certain confidential 
         information deleted) (filed as Exhibit 10.1 to the Company's Quarterly 
         Report on Form 10-Q for the quarter ended September 30, 1993 (File No. 
         0-19319) and incorporated herein by reference). 

10.21    License Agreement dated August 6, 1993 between the Company and 
         Children's Hospital Medical Center of Northern California (with 
certain 
         confidential information deleted) (filed as Exhibit 10.2 to the 
         Company's Quarterly Report on Form 10-Q for the quarter ended 
September 
         30, 1993 (File No. 0-19319) and incorporated herein by reference). 

10.22    Research Agreement and License Agreement, both dated December 16, 
1993, 
         between the Company and Burroughs Wellcome Co. (with certain 
         confidential information deleted) (filed as Exhibit 10.16 to the 
         Company's Annual Report on Form 10-K for the year ended December 31, 
         1993 (File No. 0-19319) and incorporated herein by reference). 

10.23    License Agreement dated October 2, 1995 between the Company and Alpha 
         Therapeutic Corporation (with certain confidential information 
deleted) 
         (filed as Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q 
         for the quarter ended September 30, 1995 (File No. 0-19319) and 
         incorporated herein by reference). 

   2002.  EDGAR Online, Inc.

-43- 

10.24    License Agreement and Supply Agreement, both dated May 9, 1996, 
between 
         the Company and BioChem Pharma (International) Inc. (with certain 
         confidential information deleted)(filed as Exhibit 10.1 to the 
         Company's Quarterly Report on 10-Q for the quarter ended March 31, 
1996 
         (File No. 0-19319) and incorporated herein by reference). 

21       Subsidiaries of the Company (filed as Exhibit 21 to the Company's 
         Annual Report on Form 10-K for the year ended December 31, 1995 (File 
         no. 0-19319) and incorporated herein by reference). 

23       Consent of Independent Accountants (filed herewith). 

27       Financial Data Schedule (submitted as an exhibit only in the 
electronic 
         format of this Annual Report on Form 10-K submitted to the Securities 
         and Exchange Commission. 

* Compensatory plan or agreement applicable to management and employees. 

(b) Reports on Form 8-K. No reports on Form 8-K were filed by the Company during the quarter ended December 31, 1996. 

-44- 
SIGNATURES 

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

VERTEX PHARMACEUTICALS INCORPORATED 

March 27, 1997          By:   /s/Joshua S. Boger 

---------------------------------------- 
                              Joshua S. Boger 
                              President and Chief Executive Officer 

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

   2002.  EDGAR Online, Inc.

                              
Name                                      Title                        Date 
- ---- 

/s/Joshua S. Boger               Director, President and          March 27, 
1997 
- -----------------------------    Chief Executive Officer 
Joshua S. Boger                  (Principal Executive Officer) 

/s/Thomas G. Auchincloss, Jr.    Vice President of Finance        March 27, 
1997 
- -----------------------------    and Treasurer 
Thomas G. Auchincloss, Jr.       (Principal Financial Officer) 

/s/Hans D. van Houte             Controller                       March 27, 
1997 
- ----------------------------- 
Hans D. van Houte 

/s/Barry M. Bloom                Director                         March 25, 
1997 
- ----------------------------- 
Barry M. Bloom 

Donald R. Conklin 

Director March , 1997 

/s/Roger W. Brimblecombe         Director                         March 27, 
1997 
- ----------------------------- 
Roger W. Brimblecombe 

/s/William W. Helman IV          Director                         March 27, 
1997 
- ----------------------------- 
William W. Helman IV 

/s/Charles A. Sanders            Director                         March 25, 
1997 
- ----------------------------- 
Charles A. Sanders 

-45- 
VERTEX PHARMACEUTICALS INCORPORATED 

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS 

   2002.  EDGAR Online, Inc.

                                                             Page 
Number 

----------- 
Report of Independent Accountants                                 F-2 

Consolidated Balance Sheets as of December 31, 1996 and 1995      F-3 

Consolidated Statements of Operations for the years ended 
December 31, 1996, 1995 and 1994                                  F-4 

Consolidated Statements of Stockholders' Equity for the 
years ended December 31, 1996, 1995 and 1994                      F-5 

Consolidated Statements of Cash Flows for the years ended 
December 31, 1996, 1995 and  1994                                 F-6 

Notes to Consolidated Financial Statements                        F-7 

REPORT OF INDEPENDENT ACCOUNTANTS 

F-1 

To the Board  of Directors and Stockholders Vertex Pharmaceuticals Incorporated: 

We have audited the accompanying consolidated balance sheets of Vertex Pharmaceuticals Incorporated and Subsidiaries as of 
December 31, 1996 and 1995, and the related consolidated statements of operations, stockholders' equity and cash flows for each of 
the three years in the period ended December 31, 1996. 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 generally accepted auditing standards. 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 consolidated financial position of 
Vertex Pharmaceuticals Incorporated and Subsidiaries as of December 31, 1996 and 1995, and the consolidated results of their 
operations and their cash flows for each of the three years in the period ended December 31, 1996, in conformity with generally 
accepted accounting principles. 

                                    /s/ Coopers & Lybrand 
L.L.P. 
                                    Coopers & Lybrand L.L.P. 

Boston, Massachusetts 
February 18, 1997 

CONSOLIDATED BALANCE SHEETS 
VERTEX PHARMACEUTICALS INCORPORATED 

F-2 

   2002.  EDGAR Online, Inc.

                                                             
                                                                                           December 31, 
                                                                  Pro Forma 1996     ----------------------- 
(Dollars in thousands)                                      (Note N) (unaudited)        1996          1995 
- ------------------------------------------------------------------------------------------------------------ 
Assets 
  Current assets: 
     Cash and cash equivalents                                         $ 183,714     $  34,851     $  28,390 
     Short-term investments                                               95,508        95,508        58,588 
     Prepaid expenses and other current assets                             1,791         1,791           959 
- ------------------------------------------------------------------------------------------------------------ 
       Total current assets                                              281,013       132,150        87,937 
  Restricted cash                                                          2,316         2,316         2,316 
  Property and equipment, net                                              8,663         8,663         7,840 
  Other assets                                                               370           370           888 
- ------------------------------------------------------------------------------------------------------------ 
       Total assets                                                    $ 292,362     $ 143,499     $  98,981 
- ------------------------------------------------------------------------------------------------------------ 
Liabilities and Stockholders' Equity 
  Current liabilities: 
     Obligations under capital lease                                   $   2,910     $   2,910     $   2,075 
     Accounts payable                                                      1,391         1,391         3,022 
     Accrued expenses                                                      2,755         2,755         3,503 
     Deferred revenue                                                         --            --           197 
- ------------------------------------------------------------------------------------------------------------ 
       Total current liabilities                                           7,056         7,056         8,797 
  Obligations under capital lease, excluding current portion               5,617         5,617         4,912 
- ------------------------------------------------------------------------------------------------------------ 
       Total liabilities                                                  12,673        12,673        13,709 
- ------------------------------------------------------------------------------------------------------------ 
  Commitments (Note H) 
  Stockholders'  equity: 
     Preferred stock, $.01 par value; 1,000,000 shares  authorized; 
       none issued 
     Common stock, $.01 par value; 50,000,000 shares authorized; 
       21,097,117 and 17,299,139 shares issued and outstanding 
       in 1996 and 1995, respectively. (24,547,117 shares issued 
       and outstanding, pro forma 1996, unaudited)                           246           211           173 
     Additional paid-in capital                                          376,338       227,510       142,038 
     Equity adjustments                                                       49            49            -- 
     Accumulated deficit                                                 (96,944)      (96,944)      (56,939) 
- ------------------------------------------------------------------------------------------------------------ 
       Total stockholders' equity                                        279,689       130,826        85,272 
- ------------------------------------------------------------------------------------------------------------ 
       Total liabilities and stockholders' equity                      $ 292,362     $ 143,499     $  98,981 
- ------------------------------------------------------------------------------------------------------------ 

The accompanying notes are an integral part of the consolidated financial statements. 

CONSOLIDATED STATEMENTS OF OPERATIONS 
VERTEX PHARMACEUTICALS INCORPORATED 

F-3 

   2002.  EDGAR Online, Inc.

                                                               Year Ended December 31, 
                                                        ---------------------------------- 
(In thousands, except per share data)                      1996         1995         1994 
- ------------------------------------------------------------------------------------------ 
Revenues: 
  Collaborative and other research and development      $ 13,341     $ 22,081     $ 19,571 
  Interest income                                          5,257        5,453        3,574 
                                                        --------     --------     -------- 
     Total revenues                                       18,598       27,534       23,145 
- ------------------------------------------------------------------------------------------ 
Costs and expenses: 
  Research and development                                35,212       41,512       34,761 
  General and administrative                               7,929        7,069        5,540 
  License payment                                         15,000           --           -- 
  Interest                                                   462          481          439 
                                                        --------     --------     -------- 
     Total costs and expenses                             58,603       49,062       40,740 
- ------------------------------------------------------------------------------------------ 
Net loss                                                $(40,005)    $(21,528)    $(17,595) 
- ------------------------------------------------------------------------------------------ 
Net loss per common share                               $  (2.13)    $  (1.25)    $  (1.11) 
Weighted average number of common shares outstanding      18,798       17,231       15,818 
- ------------------------------------------------------------------------------------------ 

The accompanying notes are an integral part of the consolidated financial statements. 

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY 
VERTEX PHARMACEUTICALS INCORPORATED 

F-4 

                                                           Common Stock          Additional 
                                                      -------------------       Paid-In       Equity    Accumulated 
(In thousands)                                     Shares       Amount        Capital    Adjustments     Deficit         Total 
- ------------------------------------------------------------------------------------------------------------------- 
Balance, December 31, 1993                       12,484      $     125      $ 67,211                     $(17,816)    $ 49,520 
Issuances of common stock: 
  Public offering of common stock                3,450             34        58,028                                       58,062 
  Private placement of common stock             1,200             12        14,988                                       15,000 
  Benefit plans                                         61              1            693                                          694 
Repurchases of common stock, at cost                (6) 
Net change in unrealized holding gains/ 
  losses on marketable securities                                                          $    (205)                         (205) 
Translation adjustments                                                                             2                              2 
Net loss                                                                                                        (17,595)     (17,595) 
- ------------------------------------------------------------------------------------------------------------------- 
Balance, December 31, 1994                       17,189            172       140,920          (203)      (35,411)     105,478 
Issuances of common stock: 
  Benefit plans                                         93              1         1,118                                        1,119 
  Warrant exercise                                     17 
Net change in unrealized holding gains/ 
  losses on marketable securities                                                                203                           203 
Net loss                                                                                                        (21,528)     (21,528) 
- ------------------------------------------------------------------------------------------------------------------- 
Balance, December 31, 1995                       17,299            173       142,038            --       (56,939)       85,272 
Issuances of common stock: 
  Public offering of common stock                3,450             34        77,481                                       77,515 
  Private placement of common stock               152              2         4,998                                        5,000 
  Benefit plans                                       196              2         2,993                                        2,995 
Net change in unrealized holding gains/ 
  losses on marketable securities                                                                 35                            35 
Translation adjustments                                                                            14                            14 
Net loss                                                                                                        (40,005)     (40,005) 
- ------------------------------------------------------------------------------------------------------------------- 
Balance, December 31, 1996                       21,097      $     211      $227,510     $      49      $(96,944)    $130,826 
- ------------------------------------------------------------------------------------------------------------------- 

The accompanying notes are an integral part of the consolidated financial statements. 

F-5 

   2002.  EDGAR Online, Inc.

CONSOLIDATED STATEMENTS OF CASH FLOWS 
VERTEX PHARMACEUTICALS INCORPORATED 

                                                                  Year Ended December 31, 
                                                           ---------------------------------- 
(In thousands)                                                1996         1995         1994 
- --------------------------------------------------------------------------------------------- 
Cash flows from operating activities: 
  Net loss                                                 $(40,005)    $(21,528)    $(17,595) 
  Adjustment to reconcile net income (loss) to net 
     cash used by operating activities: 
     Depreciation and amortization                            3,160        3,710        3,485 
  Changes in assets and liabilities: 
     Prepaid expenses and other current assets                 (832)        (549)         619 
     Accounts payable                                        (1,631)       1,624       (2,080) 
     Accrued expenses                                          (748)       1,231        1,106 
     Deferred revenue                                          (197)        (438)        (219) 
                                                           --------     --------     -------- 
       Net cash provided (used) by operating activities     (40,253)     (15,950)     (14,684) 
- --------------------------------------------------------------------------------------------- 
Cash flows from investing activities: 
  Purchases of short-term investments                       (73,035)     (61,862)     (83,850) 
  Sales and maturities of short-term investments             36,150       38,304       72,346 
  Deposit to collateralize letter of credit                      --       (2,316)          -- 
  Expenditures for property and equipment                    (3,983)      (3,078)      (4,230) 
  Other assets                                                  518          (65)        (690) 
                                                           --------     --------     -------- 
       Net cash provided (used) by investing activities     (40,350)     (29,017)     (16,424) 
- --------------------------------------------------------------------------------------------- 
Cash flows from financing activities: 
  Repayment of capital lease obligations                     (2,187)      (1,790)      (1,902) 
  Proceeds from equipment sale/leaseback                      3,727        2,385        2,320 
  Proceeds from public offerings of common stock             77,515           --       58,062 
  Proceeds from private placement of common stock             5,000           --       15,000 
  Proceeds from other issuances of capital stock              2,995        1,119          694 
                                                           --------     --------     -------- 
       Net cash provided (used) by financing activities      87,050        1,714       74,174 
- --------------------------------------------------------------------------------------------- 
  Effect of exchange rates on cash                               14           --            2 
- --------------------------------------------------------------------------------------------- 
Increase (decrease) in cash and cash equivalents              6,461      (43,253)      43,068 
Cash and cash equivalents at beginning of year               28,390       71,643       28,575 
- --------------------------------------------------------------------------------------------- 
Cash and cash equivalents at end of year                   $ 34,851     $ 28,390     $ 71,643 
- --------------------------------------------------------------------------------------------- 

The accompanying notes are an integral part of the consolidated financial statements. 

VERTEX PHARMACEUTICALS INCORPORATED 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

F-6 

A. THE COMPANY 

Vertex Pharmaceuticals Incorporated (the "Company") uses a range of drug discovery technologies to identify, design and develop 
novel, orally deliverable compounds that have the potential to treat major human diseases. To date, the Company has not received any 
revenues from the sale of pharmaceutical products and does not expect to receive such revenues in the near future. The Company's 
revenues during 1996 principally resulted from research support payments from corporate partners. The Company expects to incur 
significant operating losses over the next several years as a result of expenditures for its research and development programs. 

The consolidated financial statements include the accounts of the Company and its subsidiaries, Altus Biologics Inc., Vertex Securities 
Corporation, Vertex Pharmaceuticals (Europe) Limited and Versal Technologies, Inc. All material intercompany transactions are 
eliminated. 

   2002.  EDGAR Online, Inc.

The Company is subject to risks common to companies in the biotechnology industry including, but not limited to, development by the 
Company or its competitors of new technological innovations, dependence on key personnel, protection of proprietary technology, 
technological and clinical trial uncertainty, dependence on collaborative partners, share price volatility, the need to obtain additional 
funding, reliance on pharmaceutical pricing and reimbursement, uncertainties regarding manufacturing and sales and marketing, 
product liability and compliance with government regulations. 

B. ACCOUNTING POLICIES 

Use of Estimates 

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

Cash and Cash Equivalents 

Cash equivalents, which are debt securities, are valued at cost plus accrued interest. The Company considers all highly liquid 
investments with original maturities of three months or less at the date of purchase to be cash equivalents. Changes in cash and cash 
equivalents may be affected by shifts in investment portfolio maturities as well as by actual cash receipts and disbursements. 

Short-term Investments 

Short-term investments consist of marketable securities which are classified as available-for-sale. Short-term investments are stated at 
fair value with unrealized gains and losses included as a component of stockholders' equity until realized. The fair value of these 
securities is based on quoted market prices. 

Property and Equipment 

Property and equipment are recorded at cost. Depreciation and amortization are provided using the straight-line method over the lesser 
of the lease terms or the estimated useful lives of the related assets, generally four or five years for equipment and furniture and three 
years for purchased 

software. When assets are retired or otherwise disposed of, the assets and related allowances for depreciation and amortization are 
eliminated from the accounts and any resulting gain or loss is reflected in income. 

F-7 

Revenue Recognition 

Revenue under research and development arrangements is recognized as earned under the terms of the respective agreements. License 
payments are recorded when received and the license agreements are signed. Product research funding is recorded as revenue, 
generally on a quarterly basis, as research effort is incurred. Deferred revenue arises from payments received which have not yet been 
earned under research and development arrangements. The Company recognizes milestone payments when the milestones are 
achieved. 

Research and Development 

All research and development costs are expensed as incurred. 

Income Taxes 

The Company provides for federal and state taxes on pretax income at applicable rates in accordance with Statement of Financial 
Accounting Standards No. 109, "Accounting for Income Taxes." Potential future income tax benefits resulting from net operating 
losses and unused research and experimentation tax credits are available to offset future income. 

Net Loss per Common Share 

Net loss per share is computed on the weighted average number of common shares outstanding during the period. 

   2002.  EDGAR Online, Inc.

C. FINANCIAL INSTRUMENTS 

F-8 

Financial instruments consist of the following at December 31 (in thousands): 

                                           1996                  1995 
                                   -------------------   ------------------- 
                                     Cost   Fair Value     Cost   Fair Value 
- ----------------------------------------------------------------------------

Cash                               $21,253    $21,253    $28,390    $28,390 
Cash equivalents 
    Corporate debt securities       13,598     13,598         --         -- 
                                   -------    -------    -------    ------- 
Total cash and cash equivalents    $34,851    $34,851    $28,390    $28,390 
                                   =======    =======    =======    ======= 
Short-term investments 
    US Government securities 
      Due within 1 year            $ 7,555    $ 7,568    $ 7,622    $ 7,628 
      Due within 1 to 5 years           --         --      7,591      7,606 
    Corporate debt securities 
      Due within 1 year             64,140     64,155     29,590     29,486 
      Due within 1 to 5 years       23,780     23,785     13,787     13,868 
                                   -------    -------    -------    ------- 
Total short-term investments       $95,475    $95,508    $58,590    $58,588 
                                   =======    =======    =======    ======= 

Gross unrealized holding gains and losses at December 31, 1996, were $89,000 and $56,000, respectively, and at December 31, 1995, 
$154,000 and $156,000, respectively. The effect of gross realized gains and losses on the financial statements for the years 1996 and 
1995 was immaterial. The cost of securities is based on specific identification. 

D. RESTRICTED CASH 

On March 16, 1995, the Company signed a ten-year operating lease for additional facilities to be occupied in 1996. In accordance with 
the lease agreement, the Company was required to deposit approximately $2,316,000 with its bank to collateralize a conditional, 
stand-by letter of credit in the name of the landlord. The letter of credit is redeemable only if the Company defaults on the lease under 
specific criteria. These funds are restricted from the Company's use during the lease period, although the Company is entitled to all 
interest earned on the funds. 

E. PROPERTY AND EQUIPMENT 

Property and equipment consist of (in thousands): 

   2002.  EDGAR Online, Inc.

                                                     December 31, 
                                                    1996       1995 
- --------------------------------------------------------------------

Leasehold improvements                            $ 4,719    $ 4,558 
Furniture and equipment                             2,260      2,244 
Purchased software                                  2,418      2,345 
Equipment under capital lease                      19,303     15,570 
- --------------------------------------------------------------------

                                                   28,700     24,717 
Less accumulated depreciation and amortization     20,037     16,877 
- --------------------------------------------------------------------

                                                  $ 8,663    $ 7,840 
- --------------------------------------------------------------------

The net book value of equipment under capital lease was $7,366,000 and $6,172,000 at December 31, 1996 and 1995, respectively. 

F. CAPITAL LEASES 

F-9 

At December 31, 1996, long-term capital lease obligations were as follows (in thousands): 

Year ended December 31, 
- ------------------------------------------------------------------------------

1997                                                                    $3,429 
1998                                                                     2,358 
1999                                                                     1,769 
2000                                                                     1,164 
2001                                                                     1,030 
- ------------------------------------------------------------------------------

  Total                                                                  9,750 
Less amount representing interest payments                               1,223 
- ------------------------------------------------------------------------------

Present value of minimum lease payments                                  8,527 
Less current portion                                                     2,910 
- ------------------------------------------------------------------------------

                                                                        $5,617 
- ------------------------------------------------------------------------------

During 1996 and 1995, the Company financed under capital lease arrangements an aggregate of $3,727,000 and $2,385,000, 
respectively, of asset cost under its master lease agreements. These agreements have a term of four or five years, and require that the 
Company maintain a certain level of cash and investments. At the end of the lease term, the Company has the right to either return the 
equipment to the lessor or purchase the equipment for fair market value at that time. Interest paid under capital leases was $462,000 
and $481,000 in 1996 and 1995, respectively. At December 31, 1996, the Company had availability under its 1996 master lease 
agreement to finance up to an additional $2,194,000 of equipment. 

G. ACCRUED EXPENSES 

   2002.  EDGAR Online, Inc.

Accrued expenses consist of (in thousands): 

                                                               December 31, 
                                                             1996         1995 
- ------------------------------------------------------------------------------

Professional fees                                          $1,196       $  759 
Development contract costs                                    317        1,867 
Other                                                       1,242          877 
- ------------------------------------------------------------------------------

                                                           $2,755       $3,503 
- ------------------------------------------------------------------------------

H. COMMITMENTS 

Facilities and Equipment 

The Company's facilities are leased under operating leases. The Company's long-term facilities leases have terms through the year 
2005 and have noncancelable future minimum payments of $2,655,000 in 1997, $2,636,000 in 1998 and 1999, and $2,033,000 in the 
years 2000 and 2001. Rental expense was $3,063,000, $1,281,000, and $842,000 in 1996, 1995 and 1994, respectively. 

Software 

The Company has certain license and maintenance contracts that contain future, committed payments for the support and upgrade of 
specific software programs currently used in research. For the years 1997, 1998, 1999, 2000 and 2001, these amounts are $176,000, 
$194,000, $213,000, $234,000 and $258,000, respectively. 

I. INCOME TAXES 

F-10 

The Company's federal statutory income tax rate for 1996, 1995 and 1994 was 34%. The Company recorded no income tax benefit for 
1996, 1995 and 1994 due to full valuation allowance recorded against net operating losses. 

Deferred tax liabilities and assets are determined based on the difference between financial statement and tax bases using enacted tax 
rates in effect for the year in which the differences are expected to reverse. The components of the deferred taxes were as follows (in 
thousands): 

                                    1996         1995 
                                 --------------------- 
Net operating loss               $ 30,567     $ 17,191 
Tax credits carryforward            4,089        3,233 
Property, plant and equipment       1,253        1,327 
Other                                 526          416 
                                 --------------------- 
Gross deferred tax asset           36,435       22,167 
Valuation allowance               (36,435)     
(22,167) 
                                 --------------------- 
Net deferred tax balance         $     --     $     -- 
                                 ===================== 

For federal income tax purposes, as of December 31, 1996, the Company has regular tax net operating loss carryforwards of 

   2002.  EDGAR Online, Inc.

approximately $89,903,000 and $4,089,000 of tax credits, which may be used to offset future income. These net operating loss 
carryforwards expire beginning in 2005, and the tax credit carryforwards begin to expire in 2004. 

The amount of tax credits and net operating loss carryforwards that the Company may utilize in any one year is limited, in accordance 
with Internal Revenue Code 
Section 382. This limitation arises whenever a cumulative change in ownership in excess of 50% occurs. A change of ownership has 
occurred which will limit the amount of net operating loss and tax credits available prior to the change. There may also be a second 
change of ownership subsequent to 1996 which may also limit the amount of net operating loss and tax credit utilization in a 
subsequent year. 

J. COMMON AND PREFERRED STOCK 

Common Stock 

In August 1996, the Company completed a public offering of 3,450,000 shares of its common stock at a price of $24 per share with net 
proceeds to the Company of approximately $77,515,000. In June 1996, Glaxo Wellcome purchased 151,792 shares of the Company's 
common stock at a price of $32.94 per share, with net proceeds to the Company of approximately $5,000,000. In November 1994, the 
Company sold an additional 1,200,000 shares of common stock in a private placement to a subsidiary of BB Biotech AG at a price of 
$12.50 per share, with net proceeds to the Company of approximately $15,000,000. In February 1994, the Company sold 3,450,000 
shares of its $.01 par value common stock in an underwritten public offering at a price to the public of $18.00 per share, with net 
proceeds to the Company of approximately $58,062,000. 

During 1996, an additional 100,000 shares were reserved for the Company's 401(k) Plan and an additional 150,000 shares were 
reserved for the Company's Employee Stock Purchase Plan. At December 31, 1996, 5,813,988 shares of the Company's common stock 
were reserved for exercise of common stock options granted or to be granted under its 1991 Stock Option Plan, 1994 Stock and 
Option Plan, and 1996 Stock and Option Plan, 48,999 shares were reserved for exercise of certain other options granted in 1991, 
125,955 shares of common stock were reserved for issuance under the Company's 401(k) Plan, and 140,111 shares of common stock 
were reserved for issuance under the Company's Employee Stock Purchase Plan. 

F-11 

Stock Option Plans 

The Company applies APB Opinion No. 25 and related interpretations in accounting for its plans. However, pro forma disclosures as 
if the Company adopted the cost recognition requirements under FASB Statement No. 123 "Accounting for Stock-Based 
Compensation" ("SFAS 123") in 1996 and 1995 are presented below. No compensation expense was recognized for these plans in 
1996, 1995 and 1994. 

The Company's 1991 Stock Option Plan (the "1991 Plan"), reserved shares for granting up to 2,000,000 options as either options 
intended to qualify as "incentive stock options" under the Internal Revenue Code or non-qualified stock options. The Company's 1994 
Stock and Option Plan (the "1994 Plan") reserved an additional 2,000,000 shares to the number of shares previously reserved under 
the 1991 Plan which are not granted under the plan or which cease to be outstanding by reason of cancellation. The Company's 1996 
Stock and Option Plan 
(the "1996 Plan"; together with the 1991 Plan and the 1994 Plan, the "Plans") 
reserved an additional 2,000,000 shares to the 1991 Plan and the 1994 Plan. Under the 1994 Plan and the 1996 Plan, stock rights, 
which are either (i) incentive stock options, (ii) non-qualified stock options ("NQSOs"), or (iii) award shares of common stock or the 
opportunity to make a direct purchase of shares of common stock ("Stock Awards"), may be granted to employees (including officers 
and directors who are employees), consultants, advisors and non-employee directors (NQSOs and stock awards only), either as options 
intended to qualify as "incentive stock options" under the Internal Revenue Code or as non-qualified stock options. Incentive stock 
options granted under the Plans may not be granted at a price less than the fair market value of the common stock on the date of grant. 
Non-qualified stock options may be granted at an exercise price established by the Compensation Committee of the Board of 
Directors, which may be less than, equal to or greater than the fair value of the common stock on the date of grant. Vesting periods, 
generally four or five years, are determined by the Compensation Committee. Incentive stock options granted under the Plans must 
expire not more than ten years from the date of grant. 

Stock option activity for the years ended December 31, 1996, 1995 and 1994 is as follows (shares in thousands): 

F-12 

   2002.  EDGAR Online, Inc.

                                     1996                  1995                 1994 
                              ------------------   ------------------   ------------------ 
                                        Weighted             Weighted             Weighted 
                                        Average              Average              Average 
                                        Exercise             Exercise             Exercise 
                              Shares      Price    Shares      Price    Shares      Price 
                              ------    --------   ------    --------   ------    -------- 
Outstanding at 
  beginning of year            3,196     $14.63     2,523     $13.13     1,660     $13.36 
Granted                        1,056     $31.11       829     $18.77       935     $12.64 
Exercised                       (139)    $12.96       (42)    $11.48       (10)    $ 9.72 
Canceled                         (80)    $16.11      (114)    $12.51       (62)    $12.46 
                              ------                -----                ----- 
Outstanding at end 
  of year                      4,033     $18.98     3,196     $14.63     2,523     $13.13 
                              ------                -----                ----- 
Options exercisable 
  at year-end                  1,625     $13.92     1,152     $12.99       662     $12.74 
                              ------                -----                ----- 
Weighted average fair 
  value of options granted 
  during the year             $15.04                $9.05 
                              ------                ----- 

The fair value of each option granted during 1996 and 1995 was estimated on the date of grant using the Black-Scholes option-pricing 
model with the following weighted average assumptions: (1) expected life of 5.41 years (2) expected volatility of 42% (3) risk-free 
interest rate of 6.30% and (4) no dividend yield. 

The following table summarizes information about stock options outstanding and exercisable at December 31, 1996 (shares in 
thousands): 

                              Options Outstanding                   Options Exercisable 
                   -------------------------------------------    ----------------------- 
                                     Weighted         Weighted                   Weighted 
                                      Average         Average                    Average 
Range of              Number         Remaining        Exercise      Number       Exercise 
exercise prices    Outstanding    Contractual Life     Price      Exercisable      Price 
- ---------------    -----------    ----------------    --------    -----------    -------- 
$ 6.48 - $ 9.72         145             6.1            $ 8.28          133        $ 8.33 
$ 9.73 - $14.58       1,291             7.3            $12.25          822        $12.22 
$14.59 - $21.87       1,538             7.9            $17.30          644        $16.48 
$21.88 - $32.80       1,002             9.8            $30.73           10        $25.95 
$32.81 - $37.50          57             9.5            $37.17           16        $37.14 
                      -----                                          ----- 
$ 6.48 - $37.50       4,033             8.1            $18.98        1,625        $13.92 
                      -----                                          ----- 

Employee Stock Purchase Plan 

Under the Company's Employee Stock Purchase Plan, substantially all permanent employees may, through payroll withholdings, 
purchase shares of the Company's common stock at a price of 85% of the lesser of fair market value at the beginning or end of each 
six-month withholding period. 

F-13 
During 1996, 32,296 shares of common stock at an average price of $19.21 per share were issued to employees under the plan. During 
1995, 42,445 shares of common stock at a price of $11.26 per share were issued to employees under the plan. During 1994, 34,263 
shares were issued at an average price of $10.73 per share. Had the Company adopted SFAS 123, the weighted average fair value of 
each purchase right granted during 1996 and 1995 would have been $5.76 and $3.25, respectively. The fair value was estimated at the 
beginning of the withholding period using the Black-Scholes option-pricing model with the following weighted average assumptions: 

   2002.  EDGAR Online, Inc.

(1) expected life of one half year for both years (2) expected volatility of 41% and 35% for 1996 and 1995 respectively (3) risk-free 
interest rate of 5.50% for both years and (4) no dividend yield. 

Pro forma Disclosures 

Had compensation cost for the Company's 1996 and 1995 grants for stock-based compensation plans been determined consistent with 
SFAS 123, the Company's net loss and net loss per share for 1996 and 1995 would approximate the pro forma amounts below (in 
thousands except per share data): 

                                              1996                1995 
                                              ----                ---- 
Net loss              As reported           $(40,005)           
$(21,528) 
                       Pro forma            $(42,025)           
$(21,750) 

Net loss per share    As reported           $  (2.13)           $  
(1.25) 
                       Pro forma            $  (2.24)           $  
(1.26) 

The effects of applying SFAS 123 in this pro forma disclosure are not indicative of future amounts. SFAS 123 does not apply to 
awards prior to 1995, and additional awards in future years are anticipated. 

Warrants 

During 1995, all remaining warrants, originally issued in connection with equipment lease financing transactions, were exercised in 
non-cash, net exercise transactions to acquire an aggregate of 16,801 shares of common stock. 

Rights 

Pursuant to the Company's Stockholder Rights Plan, under an amendment approved by the Board of Directors on February 18, 1997, 
but not yet executed by the rights agent, each holder of a share of outstanding common stock also holds one share purchase right (a 
"Right") for each share of common stock. Each Right entitles the holder to purchase from the Company one one-hundredth of a share 
of Series A junior participating preferred stock, $.01 par value (the "Junior Preferred Shares"), of the Company at a price of $270 per 
one one-hundredth of a Junior Preferred Share (the "Purchase Price"). The Rights are not exercisable until the earlier of acquisition by 
a person or group of 15% or more of the outstanding common stock (an "Acquiring Person") or the announcement of an intention to 
make or commencement of a tender offer or exchange offer the consummation of which would result in the beneficial ownership by a 
person or group of 15% or more of the outstanding common stock. In the event that any person or group becomes an Acquiring 
Person, each holder of a Right other than the Acquiring Person will thereafter have the right to receive upon exercise that number of 
shares of common stock having a market value of two times the Purchase Price and, in the event that the Company is acquired in a 
business combination transaction or 50% or more of its assets are sold, each holder of a Right will thereafter have the right to receive 
upon exercise that number of shares of common stock of the acquiring company which at the time of the transaction will have a market 
value of two times the Purchase Price. Under certain specified circumstances, the Board of Directors of the Company may cause the 
Rights (other than Rights owned by such person or group) to be exchanged, in 

whole or in part, for common stock or Junior Preferred Shares, at an exchange rate of one share of common stock per Right or one 
one-hundredth of a Junior Preferred Share per Right. At any time prior to the acquisition by a person or group of beneficial ownership 
of 15% or more of the outstanding common stock, the Board of Directors of the Company may redeem the Rights in whole at a price 
of $.01 per Right. 

F-14 

K. COLLABORATIVE RESEARCH AND DEVELOPMENT AGREEMENTS 

The Company and BioChem Therapeutic Inc. ("BioChem") are collaborating on the development and commercialization in Canada of 
VX-710, Vertex's lead multidrug resistance reversal agent. Under the development agreement, BioChem is obligated to pay Vertex up 
to $4,000,000 comprised of an initial licensing fee and payments for development and commercialization milestones. From the 

   2002.  EDGAR Online, Inc.

inception of the agreement in May 1996 through the year ended December 31, 1996, $500,000 has been recognized as revenue. 
BioChem will fund development of VX-710 in Canada, including planned Phase II clinical trials in two different cancer indications. 
Vertex will supply BioChem's clinical and commercial drug supply needs. In 1996, the Company received additional revenues related 
to the sale of clinical trial material to BioChem. BioChem will pay Vertex a portion of its net sales, which will cover Vertex's cost of 
supplying material and will provide a profit to Vertex. Revenues earned from BioChem were $577,000 in 1996. 

The Company and Alpha Therapeutic Corporation ("Alpha") are collaborating on the development and commercialization of VX-366 
for the treatment of sickle cell disease and beta thalassemia. Under the collaborative agreement, Alpha is obligated to pay the 
Company up to $5,000,000 comprised of an initial license fee and payments for development and commercialization milestones. From 
the inception of the agreement in October 1995 through the year ended December 31, 1996, $500,000 has been recognized as revenue. 
In addition, Alpha is obligated to bear all costs of development of VX-366 under the collaboration. In 1996, the Company received 
additional revenues related to the sale of clinical trial material to Alpha. Alpha has the right to terminate the agreement without cause 
upon six months' notice at any time. Termination will relieve Alpha of any further payment obligations under the agreement and will 
end the license granted to Alpha by Vertex. Vertex will supply Alpha's finished drug product needs and will receive a royalty based on 
Alpha's product sales. Revenues earned from Alpha were $225,000 and $500,000 in 1996 and 1995, respectively. 

The Company and Glaxo Wellcome plc ("Glaxo Wellcome") are collaborating on the development of compounds in connection with 
the Company's HIV Program. Under the collaborative agreement, Glaxo Wellcome agreed to pay the Company up to $42,000,000 
comprised of a $15,000,000 initial license payment paid in 1993, $14,000,000 of product research funding over five years and 
$13,000,000 of development and commercialization milestone payments. From the inception of the agreement in December 1993 
through the year ended December 31, 1996, $25,000,000, including a $2,000,000 milestone payment in December 1995 upon 
commencement of a Phase I/II trial, has been recognized as revenue. Glaxo Wellcome is also obligated to pay to Vertex additional 
development and commercialization milestone payments for subsequent drug candidates. In addition, Glaxo Wellcome agreed to bear 
all costs of development of drug candidates under the collaboration. In 1994, 1995 and 1996, the Company received additional 
revenue related to reimbursements for clinical development. Under the agreement, Glaxo Wellcome is also required to pay Vertex a 
royalty on sales. Glaxo Wellcome has the right to terminate the research collaboration without cause upon twelve months' notice given 
at any time and has the right to terminate the license arrangements without cause upon twelve months' notice given at any time 
provided such notice is not given before the research collaboration has been terminated. Termination by Glaxo Wellcome of the 
research collaboration will relieve Glaxo Wellcome of its obligation to make further research support payments under the agreement. 
Termination by Glaxo Wellcome of the license arrangements under the agreement will relieve it of its obligation to make further 
commercialization and development milestone and royalty payments and will end any 

F-15 
license granted to Glaxo Wellcome by Vertex thereunder. Revenues earned from Glaxo Wellcome were $6,289,000, $10,053,000 and 
$5,346,000 for 1996, 1995 and 1994. In June 1996, the Company and Glaxo Wellcome obtained a worldwide, non-exclusive license 
under certain G.D. Searle & Co. ("Searle") patent applications in the area of HIV protease inhibition. Vertex paid $15,000,000 and 
Glaxo Wellcome paid $10,000,000 to Searle for the license. The Company also agreed to pay Searle a royalty on sales of VX-478, the 
Company's lead HIV compound. 

The Company and Hoechst Marion Roussel ("HMR") are collaborating on the development of interleukin-1 beta converting enzyme 
inhibitors as anti-inflammatory agents. Under the collaborative agreement, HMR is obligated to pay the Company up to $30,500,000, 
comprised of $18,500,000 of product research funding over five years and $12,000,000 of development and commercialization 
milestone payments. From the inception of the agreement in September 1993 through the year ended December 31, 1996, $14,500,000 
has been recognized as revenue. HMR has the right to terminate the agreement without cause upon twelve months' notice at any time. 
For a period of one year after any such termination, HMR retains the right to select one or more compounds for development and to 
license such compound or compounds from Vertex, provided HMR resumes all research funding and commercialization milestone 
payments and makes all such payments that would otherwise have been due but for such termination. Otherwise, in the case of such 
termination, all rights to compounds developed under the research and license agreements will revert to Vertex. The Company also 
received additional revenue related to reimbursement for patent filings in HMR's territories. Revenues earned under the HMR 
agreement were $4,196,000, $3,749,000, and $3,514,000 in 1996, 1995 and 1994, respectively. 

The Company and Kissei Pharmaceutical Co., Ltd. ("Kissei") are collaborating on the research and development of compounds in 
connection with the Company's HIV Program. Under the collaborative agreement, Kissei is obligated to pay the Company up to 
$20,000,000, comprised of $9,800,000 of product research funding through 1995, $7,000,000 of development milestone and territory 
option payments and a $3,200,000 equity investment. In December 1995, Vertex recognized $2,700,000 in revenue which represented 
a territory option payment Kissei exercised for the rights to develop VX-478 in certain other Far East countries in addition to Japan 
and the People's Republic of China. From the inception of the agreement in April 1993 through the year ended December 31, 1996, 
$17,842,000 has been received including $3,200,000 as an equity investment and $14,642,000 was recognized as revenue. The 
Company received additional revenue related to reimbursements for clinical development in 1996, 1995 and 1994. Under the 

   2002.  EDGAR Online, Inc.

collaboration, Kissei is also required to pay Vertex a royalty on sales. Revenues earned under the Kissei agreement were $692,000, 
$5,370,000, and $5,498,000 in 1996, 1995 and 1994, respectively. Product research funding under this agreement ended at December 
31, 1995. 

F-16 

The Company and Chugai Pharmaceutical Co., Ltd. ("Chugai") entered into a collaborative agreement for research and development 
of immunosuppressive compounds in conjunction with Vertex's Autoimmune Diseases Program. Under the collaborative agreement, 
Chugai agreed to pay Vertex up to $30,300,000, composed of $19,300,000 of product research funding until 1995, $9,000,000 of 
development and commercialization milestone payments and a $2,000,000 equity investment. Research funding under this agreement 
ended in the first half of 1995 and the research collaboration ended in October of 1995. Revenues earned under the Chugai Agreement 
were $34,000, $1,915,000, and $4,969,000 in 1996, 1995 and 1994, respectively. All of the research funding received from Chugai 
has been applied to defray costs of the collaborative research program. 

L. EMPLOYEE BENEFITS 

The Company has a 401(k) retirement plan in which substantially all of its permanent employees are eligible to participate. 
Participants may contribute up to 15% of their annual compensation to the plan, subject to statutory limitations. For 1996, the 
Company declared discretionary matching contributions to the plan in the aggregate amount of $444,000, payable in the form of shares 
of the Company's common stock. Of these shares, 7,013 were issued as of December 31, 1996 with the remaining 5,734 issuable in 
1997. For 1995, the Company declared discretionary matching contributions to the plan in the aggregate amount of $354,000, payable 
in the form of 17,469 shares of the Company's common stock, issued in 1996. For 1994, the Company declared discretionary matching 
contributions to the plan in the aggregate amount of $263,000, payable in the form of shares of the Company's common stock. Of these 
shares, 10,063 were issued as of December 31, 1994 with the remaining 9,750 issued in 1995. 

M. RELATED PARTY 

A sibling of the Company's president is a partner in the law firm representing the Company to which $472,000, $255,000, and 
$437,000 in legal fees were paid in 1996, 1995 and 1994, respectively. 

N. SUBSEQUENT EVENT (UNAUDITED) 

On March 12, 1997, the Company completed a public offering of 3,450,000 shares of its common stock. The Company anticipates 
using the net proceeds of approximately $148,863,000 primarily to fund research and product development programs, including 
clinical trials, and for general corporate purposes. The unaudited pro forma balance sheet of the Company as of December 31, 1996 
has been adjusted to reflect the issuance and sale of 3,450,000 shares of common stock on March 12, 1997 and receipt of the net 
proceeds therefrom. 

F-17 

   2002.  EDGAR Online, Inc.

EXHIBITS. 

EXHIBIT                             EXHIBIT 
NUMBER                              DESCRIPTION 
- -------                             ----------- 
3.1      Restated Articles of Organization (filed as Exhibit 3.1 to the 
         Company's Registration Statement on Form S-1 (Registration No. 
         33-43874) and incorporated herein by reference). 

3.2      Articles of Amendment filed with the Commonwealth of Massachusetts on 
         May 17, 1995 (filed as Exhibit 3.1 to the Company's Quarterly Report 
on 
         Form 10-Q for the quarter ended June 30, 1995 (File No. 0-19319) and 
         incorporated herein by reference). 

3.3      By-laws of the Company (filed as Exhibit 3.2 to the Company's 
         Registration Statement on Form S-1 (Registration No. 33-43874) and 
         incorporated herein by reference). 

3.4      Certificate of Vote of Directors Establishing a Series of a Class of 
         Stock, as filed with the Secretary of the Commonwealth of 
Massachusetts 
         on July 31, 1991 (filed as Exhibit 3.3 to the Company's Registration 
         Statement on Form S-1 (Registration No. 33-43874) and incorporated 
         herein by reference). 

4.1      Specimen stock certificate (filed as Exhibit 4.1 to the Company's 
         Registration Statement on Form S-1 (Registration No. 33-40966) or 
         amendments thereto and incorporated herein by reference). 

4.2      Stockholder Rights Plan (filed as Exhibit 4.2 to the Company's 
         Registration Statement on Form S-1 (Registration No. 33-40966) or 
         amendments thereto and incorporated herein by reference). 

4.3      First Amendment to Rights Agreement dated as of February 21, 1997 
         (filed herewith). 

10.1     1991 Stock Option Plan, as amended and restated as of May 13, 1993 
         (filed as Exhibit 28.1 to the Company's Registration Statement on 
         Form S-8 (No. 33-65742) and incorporated herein by reference).* 

10.2     1994 Stock and Option Plan (filed as Exhibit 10.2 to the Company's 
         1994 Annual Report on Form 10-K (File No. 0-19319) and incorporated 
         herein by reference).* 

10.3     1996 Stock and Option Plan (filed herewith). 

10.4     Non-Competition and Stock Repurchase Agreement between the Company and 
         Joshua Boger, dated April 20, 1989 (filed as Exhibit 10.2 to the 
         Company's Registration Statement on Form S-1 (Registration No. 
         33-40966) or amendments thereto and incorporated herein by 
reference).* 

10.6     Form of Employee Stock Purchase Agreement (filed as Exhibit 10.3 to 
         the Company's Registration Statement on Form S-1 (Registration No. 
         33-40966) or amendments thereto and incorporated herein by 
         reference).* 

10.7     Form of Employee Non-Disclosure and Inventions Agreement (filed as 
         Exhibit 10.4 to the Company's Registration Statement on Form S-1 
         (Registration No. 33-40966) or amendments thereto and incorporated 
         herein by reference). 

10.8     Form of Executive Employment Agreement executed by Richard H. 
         Aldrich, Joshua S. 

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   2002.  EDGAR Online, Inc.

         Boger, and Vicki L. Sato (filed as Exhibit 10.6 to the Company's 1994 
         Annual Report on Form 10-K (File No. 0-19319) and incorporated herein 
         by reference).* 

10.9     Form of Amendment to Employment Agreement executed by Richard H. 
         Aldrich, Joshua S. Boger and Vicki L. Sato  (filed as Exhibit 10.1 
         to the Company's Quarterly Report on Form 10-Q for the quarter ended 
         June 30, 1995 (File No. 0-19319) and incorporated herein by 
         reference). 

10.10    Series C Convertible Preferred Stock Purchase Agreement between the 
         Company and the party named therein, dated September 21, 1990 (filed 
as 
         Exhibit 10.8 to the Company's Registration Statement on Form S-1 
         (Registration No. 33-40966) or amendments thereto and incorporated 
         herein by reference). 

10.11    Stock Purchase Agreement dated November 10, 1994 between the Company 
         and Biotech Target S.A. (filed as Exhibit 10.12 to the Company's 
         1994 Annual Report on Form 10-K (File No. 0-19319) and incorporated 
         herein by reference). 

10.12    Lease dated October 1, 1992 between C. Vincent Vappi and the Company 
         relating to the premises at 40 Allston Street, 618 Putnam Street, 228 
         Sidney Street, and 240 Sidney Street (filed as Exhibit 10.14 to the 
         Company's Annual Report on Form 10-K for the year ended December 31, 
         1992 (File No. 0-19319) and incorporated herein by reference). 

10.13    First Amendment as of March 1, 1995 to the lease between C. Vincent 
         Vappi and the Company (filed as Exhibit 10.2 to the Company's 
Quarterly 
         Report on Form 10-Q for the quarter ended June 30, 1995 (File No. 
         0-19319) and incorporated herein by reference). 

10.14    Second Amendment as of February 12, 1997 to Lease between C. Vincent 
         Vappi and the Company (filed herewith). 

10.15    Lease dated March 1, 1993, between Fort Washington Realty Trust and 
the 
         Company, relating to the premises at 625 Putnam Avenue, Cambridge, MA 
         (filed as Exhibit 10.10 to the Company's Annual Report on Form 10-K 
for 
         the year ended December 31, 1993 (File No. 0-19319) and incorporated 
         herein by reference). 

10.16    First Amendment, dated 1 December 1996, to Lease between Fort 
         Washington Realty Trust and the Company dated 1 March 1993 (filed 
         herewith). 

10.17    Lease dated March 3, 1995, between Fort Washington Realty Trust and 
the 
         Company, relating to the premises at 130 Waverly Street, Cambridge, MA 
         (filed as Exhibit 10.15 to the Company's 1994 Annual Report on Form 
         10-K (File No. 0-19319) and incorporated herein by reference). 

10.18    First Amendment to Lease dated March 3, 1995 between Fort Washington 
         Realty Trust and the Company (filed as Exhibit 10.15 to the Company's 
         1995 Annual Report on Form 10-K (File No. 0-19319) and incorporated 
         herein by reference). 

10.19    Research and Development Agreement dated April 13, 1993 between the 
         Company and Kissei Pharmaceutical Co., Ltd. (with certain confidential 
         information deleted) (filed as Exhibit 10.1 to the Company's Quarterly 
         Report on Form 10-Q for the quarter ended March 31, 1993 (File No. 
         0-19319) and incorporated herein by reference). 

10.20    Research, Development, and License Agreement dated September 8, 1993 
         between the 

   2002.  EDGAR Online, Inc.

         Company and Roussel Uclaf (with certain confidential information 
         deleted) (filed as Exhibit 10.1 to the Company's Quarterly Report on 
         Form 10-Q for the quarter ended September 30, 1993 (File No. 0-19319) 
         and incorporated herein by reference). 

10.21    License Agreement dated August 6, 1993 between the Company and 
         Children's Hospital Medical Center of Northern California (with 
certain 
         confidential information deleted) (filed as Exhibit 10.2 to the 
         Company's Quarterly Report on Form 10-Q for the quarter ended 
September 
         30, 1993 (File No. 0-19319) and incorporated herein by reference). 

10.22    Research Agreement and License Agreement, both dated December 16, 
1993, 
         between the Company and Burroughs Wellcome Co. (with certain 
         confidential information deleted) (filed as Exhibit 10.16 to the 
         Company's Annual Report on Form 10-K for the year ended December 31, 
         1993 (File No. 0-19319) and incorporated herein by reference). 

10.23    License Agreement dated October 2, 1995 between the Company and Alpha 
         Therapeutic Corporation (with certain confidential information 
deleted) 
         (filed as Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q 
         for the quarter ended September 30, 1995 (File No. 0-19319) and 
         incorporated herein by reference). 

10.24    License Agreement and Supply Agreement, both dated May 9, 1996, 
between 
         the Company and BioChem Pharma (International) Inc. (with certain 
         confidential information deleted)(filed as Exhibit 10.1 to the 
         Company's Quarterly Report on 10-Q for the quarter ended March 31, 
1996 
         (File No. 0-19319) and incorporated herein by reference). 

21       Subsidiaries of the Company (filed as Exhibit 21 to the Company's 
         Annual Report on Form 10-K for the year ended December 31, 1995 
         (File no. 0-19319) and incorporated herein by reference). 

23       Consent of Independent Accountants (filed herewith). 

27       Financial Data Schedule (submitted as an exhibit only in the 
electronic 
         format of this Annual Report on Form 10-K submitted to the Securities 
         and Exchange Commission. 

* Compensatory plan or agreement applicable to management and employees. 

EXHIBIT 4.3 

FIRST AMENDMENT TO RIGHTS AGREEMENT 

AMENDMENT, dated as of February 21, 1997, to the Rights Agreement, dated as of July 1, 1991 (the "Rights Agreement"), between 
Vertex Pharmaceuticals Incorporated, a Massachusetts corporation (the "Company"), and The First National Bank of Boston, as 
Rights Agent (the "Rights Agent"). 

The Company and the Rights Agent have heretofore executed and entered into the Rights Agreement. Pursuant to Section 27 of the 
Rights Agreement, the Company and the Rights Agent may from time to time supplement or amend the Rights Agreement in 

   2002.  EDGAR Online, Inc.

accordance with the provisions of Section 27 thereof. All acts and things necessary to make this Amendment a valid agreement, 
enforceable according to its terms, have been done and performed, and the execution and delivery of this Amendment by the Company 
and the Rights Agent have been in all respects duly authorized by the Company and the Rights Agent. 

In consideration of the foregoing and the mutual agreements set forth herein, the parties hereto agree as follows: 

1. Section 1(a) of the Rights Agreement is hereby amended in its entirety to read as follows: 

(a) "Acquiring Person" shall mean any Person (as hereinafter defined) who or which, together with all Affiliates and Associates (as 
such terms are hereinafter defined) of such Person, shall be the Beneficial Owner (as hereinafter defined) of 15% or more of the 
Common Shares of the Company then outstanding, but shall not include the Company, any Subsidiary (as hereinafter defined) of the 
Company, any employee benefit plan of the Company or any Subsidiary of the Company, any entity holding Common Shares for or 
pursuant to the terms of any such plan, or any Person who, alone or together, with all Affiliates and Associates of such Person, is, as of 
the date of this Agreement, the Beneficial Owner of 15% or more of the Common Shares of the Company then outstanding. 
Notwithstanding the foregoing, no Person shall become an "Acquiring Person" as a result of an acquisition of Common Shares by the 
Company which, by reducing the number of shares outstanding, increases the proportionate number of shares beneficially owned by 
such Person to 15% or more of the Common Shares of the Company then outstanding; provided, however, that if a Person shall 
become the Beneficial Owner of 15% or more of the Common Shares of the Company then outstanding by reason of share purchases 
by the Company and shall, after such share purchases by the Company, become the Beneficial Owner of any additional Common 
Shares of the Company, then such Person shall be deemed to be an "Acquiring Person". 

2. Section 3(a) of the Rights Agreement is hereby amended in its entirety to read as follows: 

(a) Until the earlier of (i) the tenth day after the Shares Acquisition Date or (ii) the tenth business day (or such later date as may be 
determined by action of the Board of Directors prior  to such time as any Person becomes an Acquiring Person) after the date of the 
commencement by any Person (other than the Company, any Subsidiary of the Company, any employee benefit plan of the Company 
or of any Subsidiary of the Company or any entity holding Common Shares for or pursuant to the terms of any such plan) of, or of the 
first public announcement of the intention of any Person (other than the Company, any Subsidiary of the Company, any employee 
benefit plan of the Company or of any Subsidiary of the Company or any entity holding Common Shares for or pursuant to the terms of 
any such plan) to commence, a tender or exchange offer the consummation of which would result in any Person becoming the 
Beneficial Owner of Common Shares aggregating 15% or more of the then outstanding Common Shares (including any such date 
which is after the date of this Agreement and prior to the issuance of the Rights; the earlier of such dates being herein referred to as the 
"Distribution Date"), (x) the Rights will be evidenced (subject to the provisions of Section 3(b) hereof) by the certificates for Common 
Shares registered in the names of the holders thereof (which certificates shall also be deemed to be Right Certificates) and not by 
separate Right Certificates, and (y) the right to receive Right Certificates will be transferable only in connection with the transfer of 
Common Shares. As soon as practicable after the Distribution Date, the Company will prepare and execute, the Rights Agent will 
countersign, and the Company will send or cause to be sent (and the Rights Agent will, if requested, send) by first-class, insured, 
postage-prepaid mail, to each record holder of Common Shares as of the close of business on the Distribution Date, at the address of 
such holder shown on the records of the Company, a Right Certificate, in substantially the form of Exhibit B hereto (a "Right 
Certificate"), evidencing one Right for each Common Share so held. As of the Distribution Date, the Rights will be evidenced solely 
by such Right Certificates. 

3. Section 7(b) of the Rights Agreement is hereby modified and amended by deleting the amount $60 and substituting $270 therefore. 
There shall be no adjustment to the Purchase Price as set forth in Section 7(b), as modified and amended hereby, pursuant to Section 
11(a)(i) with respect to any event described in Section 11(a)(i) which occurred prior  to the date of this Amendment. 

4. If any term, provision, covenant or restriction of this Amendment is held by a court of competent jurisdiction or other authority to be 
invalid, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions of this Amendment, and the Rights 
Agreement, shall remain in full force and effect and shall in no way be affected, impaired or invalidated. 

5. This Amendment shall be deemed to be a contract made under the laws of the Commonwealth of Massachusetts and for all purposes 
shall be governed by and construed in accordance with the laws of such Commonwealth applicable to contracts to be made and 
performed entirely within such Commonwealth. 

6. This Amendment may be executed in any number of counterparts and each of such counterparts shall for all purposes be deemed to 
be an original, and all such counterparts shall together constitute but one and the same instrument. 

7. In all respects not inconsistent with the terms and provisions of this Amendment to the Rights Agreement, the Rights Agreement is 
hereby ratified, adopted, approved and confirmed. In executing and delivering this Amendment, the Rights Agent shall be entitled to 

   2002.  EDGAR Online, Inc.

all the privileges and immunities afforded to the Rights Agent under the terms and conditions of the Rights Agreement. 

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and attested, all as of the date and year 
first above written. 

Attest:                                   VERTEX PHARMACEUTICALS 
                                          INCORPORATED 

By:  /s/ Sarah P. Cecil                   By: /s/ Richard H. Aldrich 
   ------------------------------            
---------------------------------- 
   Name: Sarah P. Cecil                      Name: Richard H. Aldrich 

   Title: Corporate Attorney                 Title: Senior Vice President 

Attest:                                   THE FIRST NATIONAL BANK OF BOSTON 

By:  /s/ Jocelyn J. Turner                By:   /s/ Colleen H. Shea 
   ------------------------------            
---------------------------------- 
   Name:                                     Name: 
   Title: Account Manager                    Title: Administration Manager 

EXHIBIT 10.3 

VERTEX PHARMACEUTICALS INCORPORATED 

1996 STOCK AND OPTION PLAN 

(as amended on February 18, 1997 and restated) 

1. DEFINITIONS 

Unless otherwise specified or unless the context otherwise requires, the following terms, as used in this Vertex Pharmaceuticals 
Incorporated 1996 Stock and Option Plan, have the following meanings: 

Affiliate means a corporation which, for purposes of Section 424 of the Code, is a parent or subsidiary of the Company, direct or 
indirect. 

Board of Directors means the Board of Directors of the Company. 

Code means the United States Internal Revenue Code of 1986, as amended. 

Committee means the Compensation Committee of the Board of Directors or any successor thereto appointed by the Board of 
Directors pursuant to Section 4 hereof to administer this Plan. 

Common Stock means shares of the Company's common stock, $.01 par value. 

Company means Vertex Pharmaceuticals Incorporated, a Massachusetts corporation. 

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Disability or Disabled means permanent and total disability as defined in 
Section 22(e)(3) of the Code. 

Exchange Act means the Securities Exchange Act of 1934, as amended. 

Fair Market Value of a Share of Common Stock on a particular date shall be the mean between the highest and lowest quoted selling 
prices on such date (the "valuation date") on the securities market where the Common Stock of the Company is traded, or if there were 
no sales on the valuation date, on the next preceding date within a reasonable period (as determined in the sole discretion of the 
Committee) on which there were sales. In the event that there were no sales in such a market within a reasonable period, the fair 
market value shall be as determined in good faith by the Committee in its sole discretion. 

ISO means an option intended to qualify as an incentive stock option under Code 
Section 422. 

Key Employee means an employee of the Company or of an Affiliate (including, without limitation, an employee who is also serving 
as an officer or director of the Company or of an Affiliate), designated by the Committee to be eligible to be granted one or more 
Stock Rights under the Plan. 

NQSO means an option which is not intended to qualify as an ISO. 

Non-Employee Director means a member of the Board of Directors who is not an employee of the Company or any Affiliate. 

Option means an ISO or NQSO granted under the Plan. Participant means a Key Employee, Non-Employee Director, consultant or 
advisor of the Company to whom one or more Stock Rights are granted under the Plan. As used herein, "Participant" shall include 
"Participant's Survivors" and a Participant' s permitted transferees where the context requires. 

Participant's Survivors means a deceased Participant's legal representatives and/or any person or persons who acquires the Participant's 
rights to a Stock Right by will or by the laws of descent or distribution. 

Plan means this Vertex Pharmaceuticals Incorporated 1996 Stock and Option Plan, as amended from time to time. 

Shares means shares of the Common Stock as to which Stock Rights have been or may be granted under the Plan or any shares of 
capital stock into which the Shares are changed or for which they are exchanged within the provisions of 
Section 3 of the Plan. The Shares issued upon exercise of Stock Rights granted under the Plan may be authorized and unissued shares 
or shares held by the Company in its treasury, or both. 

Stock Agreement means an agreement between the Company and a Participant executed and delivered pursuant to the Plan, in such 
form as the Committee shall approve. 

Stock Award means an award of Shares or the opportunity to make a direct purchase of Shares of the Company granted under the Plan. 

Stock Right means a right to Shares of the Company granted pursuant to the Plan as an ISO, an NQSO or a Stock Award. 

2. PURPOSES OF THE PLAN 

The Plan is intended to encourage ownership of Shares by Key Employees, Non-Employee Directors and certain consultants and 
advisors to the Company in order to attract such persons, to induce them to work for the benefit of the Company or of an Affiliate and 
to provide additional incentive for them to promote the success of the Company or of an Affiliate. The Plan provides for the granting 
of Stock Rights to Key Employees, Non-Employee Directors, consultants and advisors of the Company. 

3. SHARES SUBJECT TO THE PLAN 

The number of Shares subject to this Plan as to which Stock Rights may be granted from time to time shall be 2,000,000 plus the 
number of shares of Common Stock previously reserved for the granting of options under the Vertex Pharmaceuticals Incorporated 
1991 Stock Option Plan and 1994 Stock and Option Plan but not granted thereunder, or the equivalent of such number of Shares after 
the Committee, in its sole discretion, has interpreted the effect of any stock split, stock dividend, combination, recapitalization or 
similar transaction in accordance with Section 17 of this Plan. 

If an Option granted hereunder or any option granted under the 1991 Stock Option Plan or 1994 Stock and Option Plan ceases to be 

   2002.  EDGAR Online, Inc.

"outstanding", in whole or in part, or if the Company shall reacquire any Shares issued pursuant to Stock Awards, the Shares which 
were subject to such Option and any Shares so reacquired by the Company shall also be available for the granting of other Stock 
Rights under the Plan. Any Stock Right shall be treated as "outstanding" until such Stock Right is exercised in full, or terminates or 
expires under the provisions of the 

Plan, or by agreement of the parties to the pertinent Stock Agreement, without having been exercised in full. 

-2- 

4. ADMINISTRATION OF THE PLAN 

The Plan shall be administered by the Committee. Subject to the provisions of the Plan, the Committee is authorized to: 

a. Interpret the provisions of the Plan or of any Option, Stock Award or Stock Agreement and to make all rules and determinations 
which it deems necessary or advisable for the administration of the Plan; 

b. Determine which employees of the Company or of an Affiliate shall be designated as Key Employees and which of the Key 
Employees, Non-Employee Directors, consultants and advisors of the Company and its Affiliates shall be granted Stock Rights; 

c. Determine the number of Shares and exercise price for which a Stock Right or Stock Rights shall be granted; 

d. Specify the terms and conditions upon which a Stock Right or Stock Rights may be granted; and 

e. In its discretion, accelerate the date of exercise of any installment of any Stock Right; provided that the Committee shall not 
accelerate the exercise date of any installment of any Option granted to any Key Employee as an ISO (and not previously converted 
into an NQSO pursuant to Section 20) if such acceleration would violate the annual vesting limitation contained in Section 422(d) of 
the Code, as described in Section 6.2.3. 

provided, however, that all such interpretations, rules, determinations, terms and conditions shall be made and prescribed in the 
context of preserving the tax status under Code Section 422 of those Options which are designated as ISOs and shall be in compliance 
with any applicable provisions of Rule 16b-3 under the Exchange Act. Subject to the foregoing, the interpretation and construction by 
the Committee of any provisions of the Plan or of any Stock Right granted under it shall be final, unless otherwise determined by the 
Board of Directors, if the Committee is other than the Board of Directors. 

The Committee may employ attorneys, consultants, accountants or other persons, and the Committee, the Company and its officers and 
directors shall be entitled to rely upon the advice, opinions or valuations of such persons. All actions taken and all interpretations and 
determinations made by the Committee in good faith shall be final and binding upon the Company, all Participants, and all other 
interested persons. No member or agent of the Committee shall be personally liable for any action, determination, or interpretation 
made in good faith with respect to this Plan or grants hereunder. Each member of the Committee shall be indemnified and held 
harmless by the Company against any cost or expense (including counsel fees) reasonably incurred by him or liability (including any 
sum paid in settlement of a claim with the approval of the Company) arising out of any act or omission to act in connection with this 
Plan unless arising out of such member's own fraud or bad faith. Such indemnification shall be in addition to any rights of 
indemnification the members of the Committee may have as directors or otherwise under the by-laws of the Company, or any 
agreement, vote of stockholders or disinterested directors, or otherwise. 

5. ELIGIBILITY FOR PARTICIPATION 

-3- 

The Committee shall, in its sole discretion, name the Participants in the Plan, provided, however, that each Participant must be a Key 
Employee, Non-Employee Director, consultant or advisor of the Company or of an Affiliate at the time a Stock Right is granted. 
Notwithstanding the foregoing, the Committee may authorize the grant of a Stock Right to a person not then an employee, 
Non-Employee Director, consultant or advisor of the Company or of an Affiliate; provided, however, that the actual grant of such 
Stock Right shall be conditioned upon such person becoming eligible to become a Participant at or prior to the time of execution of the 
Stock Agreement evidencing such Stock Right. The granting of any Stock Right to any individual shall neither entitle that individual 
to, nor disqualify him or her from, participation in other grant of Stock Rights. Notwithstanding anything to the contrary contained in 
this Plan, no Stock Rights shall be granted to any director or officer of the Company except in accordance with the applicable rules of 
the Nasdaq Stock Market or other securities market where the Common Stock is traded. 

6. TERMS AND CONDITIONS OF OPTIONS 

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6.1 General. Each Option shall be set forth in writing in a Stock Agreement, duly executed by the Company and, to the extent required 
by law or requested by the Company, by the Participant. The Committee may provide that Options be granted subject to such 
conditions as the Committee may deem appropriate including, without limitation, subsequent approval by the shareholders of the 
Company of this Plan or any amendments thereto, provided, however, that the option price per share of the Shares covered by each 
Option shall not be less than the par value per share of the Common Stock. Each Stock Agreement shall state the number of Shares to 
which it pertains, the date or dates on which it first is exercisable and the date after which it may no longer be exercised. Option rights 
may accrue or become exercisable in installments over a period of time, or upon the achievement of certain conditions or the 
attainment of stated goals or events. Exercise of any Option may be conditioned upon the Participant's execution of a Share purchase 
agreement in form satisfactory to the Committee providing for certain protections for the Company and its other shareholders, 
including requirements that the Participant's or the Participant's Survivors' right to sell or transfer the Shares may be restricted, and the 
Participant or the Participant's Survivors may be required to execute letters of investment intent and to acknowledge that the Shares 
will bear legends noting any applicable restrictions. 

6.2 ISOs. ISOs shall be issued only to Key Employees. In addition to the minimum standards set forth in Section 6.1, ISOs shall be 
subject to the following terms and conditions, with such additional restrictions or changes as the Committee determines are appropriate 
but not in conflict with Code Section 422 and relevant regulations and rulings of the Internal Revenue Service: 

6.2.1 ISO Option Price: The Option price per Share of the Shares subject to an ISO shall not be less than one hundred percent (100%) 
of the Fair Market Value per share of the Common Stock on the date of grant of the ISO; provided, however that the Option price per 
share of the Shares subject to an ISO granted to a Participant who owns, directly or by reason of the applicable attribution rules in 
Code Section 424(d), more than ten percent (10%) of the total combined voting power of all classes of share capital of the Company or 
an Affiliate, shall not be less than one hundred ten percent (110%) of the said Fair Market Value on the date of grant. 

6.2.2 Term of ISO: Each ISO shall expire not more than ten (10) years from the date of grant; provided, however, that an ISO granted 
to a Participant who owns, directly or by reason of the applicable attribution rules in Code 
Section 424(d), more than ten percent (10%) of the total combined voting power of all classes of share capital of the Company or an 
Affiliate, shall expire not more than five (5) years from the date of grant. 

6.2.3 Limitation on Yearly ISO Exercisability: The aggregate Fair Market Value (determined at the time each ISO is granted) of the 
stock with respect to which ISOs are exercisable for the first time by each Participant in any calendar year (under this or any other ISO 
plan of the Company or an Affiliate) shall not exceed the maximum amount allowable under Section 422 of the Code. 

-4- 

6.2.4 Limitation on Grant of ISOs: No ISOs shall be granted after December 8, 2004, the date which is ten (10) years from the earlier 
of the date of the adoption of this Plan and the date of the approval of the Plan by the shareholders of the Company. 

6.3 Non-Employee Directors' Options. Each Non-Employee Director, upon first being elected or appointed to the Board of Directors, 
shall be granted an NQSO to purchase 20,000 Shares. Each such Option shall (i) have an exercise price equal to eighty-five percent 
(85%) of the Fair Market Value (per share) on the date of grant of the Option, (ii) have a term of ten (10) years, and (ii) shall become 
cumulatively exercisable in sixteen (16) equal quarterly installments, upon completion of each full quarter of service on the Board of 
Directors after the date of grant. In addition, on June 1 of each year, each Non-Employee Director shall be granted a NQSO to 
purchase 5,000 shares. Each such Option shall (i) have an exercise price equal to the Fair Market Value (per share) on the date of grant 
of such Option, (ii) have a term of ten (10) years, and (iii) be exercisable in full immediately on the date of grant. Any director entitled 
to receive an Option grant under this Section may elect to decline the Option. Notwithstanding the provisions of Section 24 concerning 
amendment of the Plan, the provisions of this Subsection shall not be amended more than once every six months, other than to comport 
with changes in the Code, the Employee Retirement Income Security Act, or the rules thereunder. Notwithstanding anything to the 
contrary contained in any other provisions of this Plan, the Committee shall have no discretion to vary the terms of Options granted 
under this Section 6.3 from those set forth herein. The provisions of Sections 11, 13 and 14 below shall not apply to Options granted 
pursuant to this Subsection. 

6.4 Limitation on Number of Options Granted. Notwithstanding anything in this Plan to the contrary, no Participant shall be granted 
Options in any calendar year for the purchase of more than 200,000 Shares. 

7. TERMS AND CONDITIONS OF STOCK AWARDS 

Each Stock Award shall be set forth in a Stock Agreement, duly executed by the Company and, to the extent required by law or 
requested by the Company, by the Participant. The Stock Agreement shall be in the form approved by the Committee, with such 
changes and modifications to such form as the Committee, in its discretion, shall approve with respect to any particular Participant or 
Participants. The Stock Agreement shall contain terms and conditions which the Committee determines to be appropriate and in the 

   2002.  EDGAR Online, Inc.

best interest of the Company; provided, however, that the purchase price per share of the Shares covered by each Stock Award shall 
not be less than the par value per Share. Each Stock Agreement shall state the number of Shares to which the Stock Award pertains, 
the date prior to which the Stock Award must be exercised by the Participant, and the terms of any right of the Company to reacquire 
the Shares subject to the Stock Award, including the time and events upon which such rights shall accrue and the purchase price 
therefor, and any restrictions on the transferability of such Shares. 

8. EXERCISE OF STOCK RIGHTS AND ISSUANCE OF SHARES 

A Stock Right (or any part or installment thereof) shall be exercised by giving written notice to the Company, together with provision 
for payment of the full purchase price in accordance with this Section for the Shares as to which such Stock Right is being exercised, 
and 

upon compliance with any other condition(s) set forth in the Stock Agreement. Such written notice shall be signed by the person 
exercising the Stock Right, shall state the number of Shares with respect to which the Stock Right is being exercised and shall contain 
any representation required by the Plan or the Stock Agreement. 

-5- 

Payment of the purchase price for the Shares as to which such Stock Right is being exercised shall be made (a) in United States dollars 
in cash or by check, or (b) at the discretion of the Committee, through delivery of shares of Common Stock already owned by the 
Participant not subject to any restriction under any plan and having a fair market value equal as of the date of exercise to the cash 
exercise price of the Stock Right, determined in good faith by the Committee, or (c) at the discretion of the Committee, by any other 
means, including a promissory note of the Participant, which the Committee determines to be consistent with the purpose of this Plan 
and applicable law, or (d) at the discretion of the Committee, in accordance with a cashless exercise program established with a 
securities brokerage firm, and approved by the Committee, or 
(e) at the discretion of the Committee, by any combination of (a), (b), (c) and 
(d) above. Notwithstanding the foregoing, the Committee shall accept only such payment on exercise of an ISO as is permitted by 
Section 422 of the Code. 

The Company shall then reasonably promptly deliver the Shares as to which such Stock Right was exercised to the Participant (or to 
the Participant's Survivors, as the case may be). In determining what constitutes "reasonably promptly," it is expressly understood that 
the delivery of the Shares may be delayed by the Company in order to comply with any law or regulation which requires the Company 
to take any action with respect to the Shares prior  to their issuance. The Shares shall, upon delivery, be fully paid, non-assessable 
Shares. 

9. RIGHTS AS A SHAREHOLDER 

No Participant to whom a Stock Right has been granted shall have rights as a shareholder with respect to any Shares covered by such 
Stock Right, except after due exercise thereof and tender of the full purchase price for the Shares being purchased pursuant to such 
exercise and registration of the Shares in the Company's share register in the name of the Participant. 

10. ASSIGNABILITY AND TRANSFERABILITY OF STOCK RIGHTS 

ISOs and, except as otherwise provided in the pertinent Stock Agreement, NQSOs and Stock Awards shall not be transferable by the 
Participant other than by will or by the laws of descent and distribution or pursuant to a qualified domestic relations order as defined 
by the Code or Title I of the Employee Retirement Income Security Act or the rules thereunder, provided, however, that the 
designation of a beneficiary of a Stock Right by a Participant shall not be deemed a transfer prohibited by this Section . Except as 
provided in the preceding sentence or as otherwise permitted under an NQSO or Stock Award Stock Agreement, a Stock Right shall be 
exercisable, during the Participant's lifetime, only by such Participant (or by his or her legal representative) and shall not be assigned, 
pledged or hypothecated in any way (whether by operation of law or otherwise) and shall not be subject to execution, attachment or 
similar process. Any attempted transfer, assignment, pledge, hypothecation or other disposition of any Stock Right or of any rights 
granted thereunder contrary to the provisions of this Plan, or the levy of any attachment or similar process upon a Stock Right, shall be 
null and void. 

11. EFFECT OF TERMINATION OF SERVICE 

11.1 Except as otherwise provided in the pertinent Stock Agreement or as otherwise provided in Sections 12, 13 or 14, if a Participant 
ceases to be an employee, director, consultant or advisor with the Company and its Affiliates (a "Termination of Service") (for any 
reason other than termination "for cause", Disability, or death) before the Participant has exercised all Stock 

   2002.  EDGAR Online, Inc.

-6- 
Rights, the Participant may exercise any Stock Right granted to him or her to the extent that the Stock Right is exercisable on the date 
of such Termination of Service, but only within the originally prescribed term of the Stock Right. Notwithstanding the foregoing, 
except as provided in Section 13, in no event may an ISO be exercised later than three (3) months after the Participant's termination of 
employment with the Company and its Affiliates. 

11.2 The provisions of this Section , and not the provisions of Section 13 or 14, shall apply to a Participant who subsequently becomes 
disabled or dies after the Termination of Service; provided, however, that in the case of a Participant's death within three (3) months 
after the Termination of Service, the Participant's Survivors may exercise the Stock Right within one (1) year after the date of the 
Participant's death, but in no event after the date of expiration of the term of the Stock Right. 

11.3 Notwithstanding anything herein to the contrary, if subsequent to a Participant's Termination of Service, but prior to the exercise 
of a Stock Right, the Committee determines that, either prior or subsequent to the Participant's Termination of Service, the Participant 
engaged in conduct which would constitute "cause" (as defined in Section 12), then such Participant shall forthwith cease to have any 
right to exercise any Stock Right. 

11.4 Absence from work with the Company or an Affiliate because of temporary disability (any disability other than a permanent and 
total Disability as defined in Section 1 hereof), or a leave of absence for any purpose, shall not, during the period of any such absence, 
be deemed, by virtue of such absence alone, a Termination of Service, except as the Committee may otherwise expressly provide. 

11.5 A change of employment or other service within or among the Company and its Affiliates shall not be deemed a Termination of 
Service, so long as the Participant continues to be an employee, director, consultant or advisor of the Company or any Affiliate; 
provided, however, that if a Participant's employment with the Company or an Affiliate should cease (other than to become an 
employee of another Affiliate or of the Company), then Section 11.1 above shall apply as to any ISOs granted to such Participant. 

12. EFFECT OF TERMINATION OF SERVICE FOR "CAUSE" 

Except as otherwise provided in the pertinent Stock Agreement, in the event of a Termination of Service of a Participant "for cause" 
all outstanding and unexercised Stock Rights as of the date the Participant is notified his or her service is terminated "for cause" will 
immediately be forfeited. For purposes of this Section 12, "cause" shall include (and is not limited to) dishonesty with respect to the 
Company and its Affiliates, insubordination, substantial malfeasance or non-feasance of duty, unauthorized disclosure of confidential 
information, conduct substantially prejudicial to the business of the Company or any Affiliate, and termination by the Participant in 
violation of an agreement by the Participant to remain in the employ of the Company of an Affiliate. The determination of the 
Committee as to the existence of cause will be conclusive on the Participant and the Company. "Cause" is not limited to events which 
have occurred prior to a Participant's Termination of Service, nor is it necessary that the Committee's finding of "cause" occur prior to 
termination. If the Committee determines, subsequent to a Participant's Termination of Service but prior to the exercise of a Stock 
Right, that either prior or subsequent to the Participant's termination the Participant engaged in conduct which would constitute 
"cause," then the right to exercise any Stock Right shall be forfeited. Any definition in an agreement between a Participant and the 
Company or an Affiliate which contains a conflicting definition of "cause" for termination and which is in effect at the time of such 
termination shall supersede the definition in this Plan with respect to that Participant. 

-7- 
13. EFFECT OF TERMINATION OF SERVICE FOR DISABILITY 

Except as otherwise provided in the pertinent Stock Agreement, in the event of a Termination of Service by reason of Disability, the 
Disabled Participant may exercise any Stock Right granted to him or her to the extent exercisable but not exercised on the date of 
Disability. A Disabled Participant may exercise such rights only within a period of not more than one (1) year after the date that the 
Participant became Disabled or, if earlier, within the originally prescribed term of the Stock Right. 

The Committee shall make the determination both of whether Disability has occurred and the date of its occurrence (unless a 
procedure for such determination is set forth in another agreement between the Company and such Participant, in which case such 
procedure shall be used for such determination). If requested, the Participant shall be examined by a physician selected or approved by 
the Committee, the cost of which examination shall be paid for by the Company. 

14. EFFECT OF DEATH WHILE AN EMPLOYEE, DIRECTOR OR CONSULTANT 

Except as otherwise provided in the pertinent Stock Agreement, in the event of death of a Participant while the Participant is an 
employee, director, consultant or advisor of the Company or of an Affiliate, any Stock Rights granted to such Participant may be 
exercised by the Participant's Survivors to the extent exercisable but not exercised on the date of death. Any such Stock Right must be 

   2002.  EDGAR Online, Inc.

exercised within one (1) year after the date of death of the Participant. 

15. PURCHASE FOR INVESTMENT 

Unless the offering and sale of the Shares to be issued upon the particular exercise of an Stock Right shall have been effectively 
registered under the Securities Act of 1933, as now in force or hereafter amended (the "1933 Act"), the Company shall be under no 
obligation to issue the Shares covered by such exercise unless and until the following conditions have been fulfilled: 

a. The person(s) who exercise such Stock Right shall warrant to the Company, at the time of such exercise or receipt, as the case may 
be, that such person(s) are acquiring such Shares for their own respective accounts, for investment, and not with a view to, or for sale 
in connection with, the distribution of any such Shares, in which event the person(s) acquiring such Shares shall be bound by the 
provisions of the following legend which shall be endorsed upon the certificate(s) evidencing their Shares issued pursuant to such 
exercise or such grant: 

"The shares represented by this certificate have been taken for investment and they may not be sold or otherwise transferred by any 
person, including a pledgee, unless (1) either (a) a Registration Statement with respect to such shares shall be effective under the 
Securities Act of 1933, as amended, or (b) the Company shall have received an opinion of counsel satisfactory to it that an exemption 
from registration under such Act is then available, and (2) there shall have been compliance with all applicable state securities laws. 

b. The Company shall have received an opinion of its counsel that the Shares may be issued upon such particular exercise in 
compliance with the 1933 Act without registration thereunder. 

The Company may delay issuance of the Shares until completion of any action or obtaining of any consent which the Company deems 
necessary under any applicable law (including, without limitation, state securities or "blue sky" laws). 

16. DISSOLUTION OR LIQUIDATION OF THE COMPANY 

-8- 

Upon the dissolution or liquidation of the Company, all Stock Rights granted under this Plan which as of such date shall not have been 
exercised will terminate and become null and void; provided, however, that if the rights of a Participant have not otherwise terminated 
and expired, the Participant will have the right immediately prior to such dissolution or liquidation to exercise any Stock Right to the 
extent that such Stock Right is exercisable as of the date immediately prior to such dissolution or liquidation. 

17. ADJUSTMENTS 

Upon the occurrence of any of the following events, a Participant's rights with respect to any Stock Right granted to him or her 
hereunder which have not previously been exercised in full shall be adjusted as hereinafter provided, unless otherwise specifically 
provided in the written agreement between the Participant and the Company relating to such Stock Right or in any employment 
agreement between a Participant and the Company or an Affiliate: 

17.1 Stock Dividends and Stock Splits. If the shares of Common Stock shall be subdivided or combined into a greater or smaller 
number of shares or if the Company shall issue any shares of Common Stock as a stock dividend on its outstanding Common Stock, 
the number of shares of Common Stock deliverable upon the exercise of such Stock Right shall be appropriately increased or 
decreased proportionately, and appropriate adjustments shall be made in the purchase price per share to reflect such subdivision, 
combination or stock dividend. The number of Shares subject to options to be granted to Non-Employee Directors pursuant to 
Section 6.3 shall also be proportionately adjusted upon the occurrence of such events. 

17.2 Consolidations or Mergers. If the Company is to be consolidated with or acquired by another entity in a merger in which the 
Company is not the surviving entity, a sale of all or substantially all of the Company's assets or otherwise (an "Acquisition"), either (i) 
the Committee or the board of directors of any entity assuming the obligations of the Company hereunder, shall, as to outstanding 
Options, make appropriate provision for the continuation of such Options by substituting on an equitable basis for the Shares then 
subject to such Options either the consideration payable with respect to the outstanding shares of Common Stock in connection with 
the Acquisition or securities of any successor or acquiring entity; or (ii) the vesting of all outstanding Options shall be accelerated and 
such Options shall become fully exercisable immediately prior to the Acquisition, notwithstanding any restrictions or vesting 
conditions set forth therein. 

17.3 Recapitalization or Reorganization. In the event of a recapitalization or reorganization of the Company (other than a transaction 
described in Section 17.2 above) pursuant to which securities of the Company or of another corporation are issued with respect to the 
outstanding shares of Common Stock, a Participant upon exercising a Stock Right shall be entitled to receive for the purchase price 

   2002.  EDGAR Online, Inc.

paid upon such exercise the securities he or she would have received if he or she had exercised such Stock Right prior to such 
recapitalization or reorganization. 

17.4 Modification of ISOs. Notwithstanding the foregoing, any adjustments made pursuant to Section 17.1, 17.2 or 17.3 with respect 
to ISOs shall be made only after the Committee determines whether such adjustments would constitute a "modification" of such ISOs 
(as that term is defined in Section 424(h) of the Code) or would cause any adverse tax consequences for the holders of such ISOs. If 
the Committee determines that such adjustments made with respect to ISOs would constitute a modification of such ISOs, it may 
refrain from making such adjustments, unless the holder of an ISO specifically requests in writing that such 

-9- 
adjustment be made and such writing indicates that the holder has full knowledge of the consequences of such "modification" on his or 
her income tax treatment with respect to the ISO. 

18. ISSUANCES OF SECURITIES 

Except as expressly provided herein, no issuance by the Company of shares of stock of any class, or securities convertible into shares 
of stock of any class, shall affect, and no adjustment by reason thereof shall be made with respect to, the number or price of Shares 
subject to Options. Except as expressly provided herein, no adjustments shall be made for dividends paid in cash or in property 
(including without limitation, securities) of the Company. 

19. FRACTIONAL SHARES 

No fractional share shall be issued under the Plan and the person exercising any Stock Right shall receive from the Company cash in 
lieu of any such fractional share equal to the Fair Market Value thereof determined in good faith by the Board of Directors of the 
Company. 

20. CONVERSION OF ISOs INTO NON-QUALIFIED OPTIONS: TERMINATION OF ISOs 

Any Options granted under this Plan which do not meet the requirements of the Code for ISOs shall automatically be deemed to be 
NQSOs without further action on the part of the Committee. The Committee, at the written request of any Participant, may in its 
discretion take such actions as may be necessary to convert such Participant's ISOs (or any portion thereof) that have not been 
exercised on the date of conversion into NQSOs at any time prior to the expiration of such ISOs, regardless of whether the Participant 
is an employee of the Company or an Affiliate at the time of such conversion. Such actions may include, but not be limited to, 
extending the exercise period or reducing the exercise price of the appropriate installments of such Options. At the time of such 
conversion, the Committee (with the consent of the Participant) may impose such conditions on the exercise of the resulting NQSOs as 
the Committee in its discretion may determine, provided that such conditions shall not be inconsistent with this Plan. Nothing in the 
Plan shall be deemed to give any Participant the right to have such Participant's ISOs converted into NQSOs, and no such conversion 
shall occur until and unless the Committee takes appropriate action. The Committee, with the consent of the Participant, may also 
terminate any portion of any ISO that has not been exercised at the time of such termination. 

21. WITHHOLDING 

In the event that any federal, state, or local income taxes, employment taxes, Federal Insurance Contributions Act ("FICA") 
withholdings or other amounts are required by applicable law or governmental regulation to be withheld from the Participant's salary, 
wages or other remuneration in connection with the exercise of a Stock Right or a Disqualifying Disposition (as defined in 
Section 22), the Participant shall advance in cash to the Company, or to any Affiliate of the Company which employs or employed the 
Participant, the amount of such withholdings unless a different withholding arrangement, including the use of shares of the Company's 
Common Stock, is authorized by the Committee (and permitted by law), provided, however, that with respect to persons subject to 
Section 16 of the Exchange Act, any such withholding arrangement shall be in compliance with any applicable provisions of Rule 
16b-3 promulgated under 
Section 16 of the Exchange Act. For purposes hereof, the Fair Market Value of any shares withheld for purposes of payroll 
withholding shall be determined in the manner provided in Section 1 above, as of the most recent practicable date prior to the date of 
exercise. If the Fair Market Value of the shares withheld is less than the amount of payroll withholdings required, the Participant my 
be required to advance the difference in cash to the Company or the Affiliate 

employer. The Committee in its discretion may condition the exercise of an Option for less than the then Fair Market Value on the 
Participant's payment of such additional withholding. 

-10- 

   2002.  EDGAR Online, Inc.

22. NOTICE TO COMPANY OF DISQUALIFYING DISPOSITION 

Each Key Employee who receives an ISO must agree to notify the Company in writing immediately after the Key Employee makes a 
"Disqualifying Disposition" of any Shares acquired pursuant to the exercise of an ISO. A Disqualifying Disposition is any disposition 
(including any sale) of such shares before the later of (a) two years after the date the Key Employee was granted the ISO, or 
(b) one year after the date the Key Employee acquired Shares by exercising the ISO. If the Key Employee has died before such Shares 
are sold, these holding period requirements do not apply and no Disqualifying Disposition can occur thereafter. 

23. EFFECTIVE DATE; TERMINATION OF THE PLAN 

The Plan shall be effective on December 12, 1996, the date of its approval by the Board of Directors. The Plan will terminate on 
December 12, 2006. The Plan may be terminated at an earlier date by vote of the Board of Directors; provided, however, that any such 
earlier termination will not affect any Stock Rights granted or Stock Agreements executed prior to the effective date of such 
termination. 

24. AMENDMENT OF THE PLAN; AMENDMENT OF STOCK RIGHTS 

The Plan may be amended by the stockholders of the Company. The Plan may also be amended by the Board of Directors or the 
Committee, including, without limitation, to the extent necessary to qualify any or all outstanding Stock Rights granted under the Plan 
or Stock Rights to be granted under the Plan for favorable federal income tax treatment (including deferral of taxation upon exercise) 
as may be afforded incentive stock options under Section 422 of the Code, to the extent necessary to ensure that Stock Rights granted 
or to be granted under the Plan are in accordance with Rule 16b-3 under the Exchange Act, and to the extent necessary to qualify the 
shares issuable upon exercise of any outstanding Stock Rights granted, or Stock Rights to be granted, under the Plan for listing on any 
national securities exchange or quotation in any national automated quotation system of securities dealers. No modification or 
amendment of the Plan shall adversely affect his or her rights under a Stock Right previously granted to a Participant without such 
Participant's consent. 

In its discretion, the Committee may amend any term or condition of any outstanding Stock Right, provided, (i) such term or condition 
as amended is permitted by the Plan, (ii) if the amendment is adverse to the Participant, such amendment shall be made only with the 
consent of the Participant, (iii) any such amendment of any ISO shall be made only after the Committee determines whether such 
amendment would constitute a "modification" of any Stock Right which is an ISO (as that term is defined in Section 424(h) of the 
Code) or would cause any adverse tax consequences for the holder of such ISO, and (iv) with respect to any Stock Right held by any 
Participant who is subject to the provisions of 
Section 16(a) of the Exchange Act, any such amendment shall be made only after the Committee determines whether such amendment 
would constitute the grant of a new Stock Right. 

25. EMPLOYMENT OR OTHER RELATIONSHIP 

Nothing in this Plan or any Stock Agreement shall be deemed to prevent the Company or an Affiliate from terminating the 
employment, consultancy or director status of a Participant, nor to prevent a Participant from terminating his or her own employment, 
consultancy or director status or to give any Participant a right to be retained in employment or other service by the Company or any 
Affiliate for any period of time. 

26. GOVERNING LAW 

-11- 

This Plan shall be construed and enforced in accordance with the law of The Commonwealth of Massachusetts. 

-12- 

EXHIBIT 10.14 

Second Amendment to Lease 

   2002.  EDGAR Online, Inc.

Date:                     As of February 12, 1997 

Lease:                    A certain lease dated October 1, 1992 between the 
                          Landlord, as landlord, and the Tenant, as tenant, 
as 
                          to the Premises, as amended by First Amendment to 
                          Lease dated as of March 1, 1995 (the "First 
                          Amendment") 

Landlord:                 C. Vincent Vappi 

Tenant:                   Vertex Pharmaceuticals Incorporated 

Premises:                 As defined in the Lease, the 618 Putnam 
                          Premises, 40 Allston Premises, 228 Sidney Premises, 
                          and 240 Sidney Premises (including Phase II of 
                          the Sidney Premises), as amended herein 

A. Landlord and Tenant have continuing obligations under the Lease. 

R E C I T A L S 

B. Landlord and Tenant desire to extend the term and modify certain terms of the Lease as set forth herein. 

NOW, THEREFORE, For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the 
Landlord and Tenant agree as follows: 

1. Paragraph I of the Lease and paragraph 1 of the First Amendment are amended to provide that the defined term, "240 Sidney 
Premises" includes all space in the building located at 240 Sidney Street, Cambridge, Massachusetts. The total rentable square feet of 
the Premises upon and after the effective date of this Amendment is 35,000. 

2. Paragraph II of the Lease is amended to provide that the Lease, as previously extended, shall expire at 11:59 P.M. on December 31, 
2003. As used in the Lease as hereby amended, the word "term" shall mean the Original Term and the Extended Term, as extended 
and amended previously and herein. 

3. Paragraph 3 of the First Amendment is deleted in its entirety. 

4. Paragraph III of the Lease is amended to provide that: 

Page 1 of 2 

Commencing January 1, 1997 through December 31, 2001, the Base Rent shall be $10.37 per rentable square foot of the Premises, or 
$363,000.00 annually (pro rata reduced for any portion of a Year) payable in monthly installments of $30,250.00; 

Commencing January 1, 2002 through December 31, 2003, the Base Rent shall be $11.93 per rentable square foot of the Premises, or 
$417,450.00 annually (pro rata reduced for any portion of a Year) payable in monthly installments of $34,787.50. 

5. In all other respects, the Lease remains in full force and effect and unmodified hereby. 

6. Notwithstanding anything to the contrary contained herein, this Second Amendment is subject to and conditional upon the 
Landlord's obtaining a loan secured by a mortgage on the Premises by April 15, 1997. In the event that such a mortgage loan is not 
concluded within such thirty-day period, this Second Amendment shall be null and void and of no effect. 

Signed under seal as of the date first written above. 

Landlord: 

   2002.  EDGAR Online, Inc.

/s/ C. Vincent Vappi 
---------------------------------

C. Vincent Vappi 

Tenant: 

VERTEX PHARMACEUTICALS INCORPORATED 

By: /s/ Richard H. Aldrich 

------------------------------------------- 

Page 2 of 2 

EXHIBIT 10.16 

FIRST AMENDMENT, DATED 1 DECEMBER 1996, TO LEASE AGREEMENT 

BETWEEN FORT WASHINGTON REALTY TRUST AND VERTEX PHARMACEUTICALS INCORPORATED 

DATED 1 MARCH 1993 

Fort Washington Realty Trust and Vertex Pharmaceuticals Incorporated hereby agree to amend the current lease on 625 Putnam 
Avenue, Cambridge, dated 1 March 1993, as follows: 

page 1, Section 1.1; page 2, Section 2; and page 2 & 3, Section 3.1; Extension of original term: 
Term: 1 February 1997 through 31 December 1998 Rent: 15,750 sq ft at $15.24/sq ft/yr=$240,000/yr=$20,000/month 

page 36, Section 11.10: Option to extend beyond first extension: 
Tenant's option to Extend: 1 January 1999 through 31 December 2000, at a rent of 15,750 sq ft at $18.00/sq 
ft/yr=$283,500/yr=$23,625/month 

Triple-net of all taxes, insurance, utilities, and operating expenses. 

All other provisions of said lease shall remain unchanged 

Signatories certify that they are empowered to commit their respective organization in matters pertaining to this agreement, executed in 
December 1996 

   2002.  EDGAR Online, Inc.

    
LESSOR:                                          LESSEE: 

/s/  HENRY H. KOLM 

/s/  ELIZABETH C. KOLM                  /s/  RICHARD H. ALDRICH 
- ------------------------------          ----------------------------------- 
Fort Washington Realty Trust            Vertex Pharmaceuticals Incorporated 
By:  Henry H. Kolm, Trustee             By:   Richard H. Aldrich 
     Elizabeth C. Kolm, Trustee               Senior VP, Chief Business 
Officer 
Date:  18 Jan 1996                      Date:   16 Dec 1996 

COOPERS COOPERS & LYBRAND L.L.P. 
&LYBRAND 

EXHIBIT 23.1 

CONSENT OF INDEPENDENT ACCOUNTANTS 

We consent to the incorporation by reference in the Registration Statement of Vertex Pharmaceuticals Incorporated on Form S-8 (File 
Nos. 33-48030, 33-48348, 33-65742, 33-93224 and 33-12325) of our report dated February 18, 1997 on our audits of the consolidated 
financial statements of Vertex Pharmaceuticals Incorporated and Subsidiaries as of December 31, 1996 and 1995, and for each of the 
three years in the period ended December 31, 1996 which report is included in this Form 10-K. 

/s/ Coopers & Lybrand 
L.L.P. 
COOPERS & LYBRAND L.L.P. 

Boston, Massachusetts 
March 27, 1997 

ARTICLE 5 
MULTIPLIER: 1,000 
CURRENCY: US DOLLARS 

PERIOD TYPE 
FISCAL YEAR END 
PERIOD START 
PERIOD END 
EXCHANGE RATE 
CASH 
SECURITIES 
RECEIVABLES 
ALLOWANCES 
INVENTORY 
CURRENT ASSETS 
PP&E 
DEPRECIATION 
TOTAL ASSETS 
CURRENT LIABILITIES 
BONDS 

YEAR 
DEC 31 1996 
JAN 01 1996 
DEC 31 1996 
1 
34,851 
95,508 
0 
0 
0 
132,150 
28,700 
20,037 
143,499 
7,056 
0 

   2002.  EDGAR Online, Inc.

PREFERRED MANDATORY 
PREFERRED 
COMMON 
OTHER SE 
TOTAL LIABILITY AND EQUITY 
SALES 
TOTAL REVENUES 
CGS 
TOTAL COSTS 
OTHER EXPENSES 
LOSS PROVISION 
INTEREST EXPENSE 
INCOME PRETAX 
INCOME TAX 
INCOME CONTINUING 
DISCONTINUED 
EXTRAORDINARY 
CHANGES 
NET INCOME 
EPS PRIMARY 
EPS DILUTED 

0 
0 
211 
130,615 
143,499 
0 
18,598 
0 
58,141 
0 
0 
462 
(40,005) 
0 
0 
0 
0 
0 
(40,005) 
(2.13) 
0 

End of Filing

   2002.  EDGAR Online, Inc.