NPS PHARMACEUTICALS INC
424B4, 1996-05-06
PHARMACEUTICAL PREPARATIONS
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<PAGE>
PROSPECTUS
 
                                3,000,000 SHARES
 
                                   [NPS LOGO]
 
                                  COMMON STOCK
 
   
    All of the 3,000,000 shares of Common Stock offered hereby are being sold by
NPS  Pharmaceuticals, Inc. ("NPS" or the  "Company"). The Company's Common Stock
is quoted on the Nasdaq National Market under the symbol "NPSP." On May 2, 1996,
the last reported  sale price for  the Common  Stock was $16.00  per share.  See
"Price Range of Common Stock."
    
 
    THE  COMMON STOCK OFFERED HEREBY  INVOLVES A HIGH DEGREE  OF RISK. SEE "RISK
FACTORS," BEGINNING ON PAGE 6.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
    EXCHANGE COMMISSION OR  ANY STATE SECURITIES  COMMISSION NOR HAS  THE
       SECURITIES  AND  EXCHANGE COMMISSION  OR ANY  STATE SECURITIES
           COMMISSION PASSED  UPON THE  ACCURACY OR  ADEQUACY  OF
               THIS  PROSPECTUS. ANY REPRESENTATION    TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.
 
   
<TABLE>
<CAPTION>
                                                             UNDERWRITING
                                                             DISCOUNTS AND     PROCEEDS TO
                                           PRICE TO PUBLIC  COMMISSIONS(1)     COMPANY(2)
<S>                                        <C>              <C>              <C>
  Per Share..............................      $15.00           $0.975           $14.025
  Total(3)...............................    $45,000,000      $2,925,000       $42,075,000
</TABLE>
    
 
(1) The Company  has  agreed  to  indemnify  the  Underwriters  against  certain
    liabilities,  including  liabilities under  the Securities  Act of  1933, as
    amended. See "Underwriting."
 
(2) Before deducting expenses of the Offering payable by the Company,  estimated
    at $300,000.
 
   
(3) The  Company has granted the Underwriters a  30-day option to purchase up to
    450,000 additional shares of Common Stock  on the same terms and  conditions
    set  forth above, solely to cover over-allotments, if any. If such option is
    exercised in full,  the total  Price to Public,  Underwriting Discounts  and
    Commissions  and  Proceeds to  Company will  be $51,750,000,  $3,363,750 and
    $48,386,250, respectively. See "Underwriting."
    
 
                            ------------------------
 
   
    The shares of Common Stock offered by the Underwriters are subject to  prior
sale,  receipt  and  acceptance  by  them  and  subject  to  the  right  of  the
Underwriters to  reject  any  order  in  whole or  in  part  and  certain  other
conditions.  It is  expected that delivery  of such  shares will be  made at the
offices of the agent of Vector Securities International, Inc., in New York,  New
York, on or about May 8, 1996.
    
 
                             ---------------------
 
Vector Securities International, Inc.
 
                      Salomon Brothers Inc
 
                                                              UBS Securities LLC
 
   
MAY 3, 1996
    
<PAGE>
    NPS-TM-, Norcalcin-TM- and Araxin-TM- are trademarks of the Company. The NPS
logo  and NPS Pharmaceuticals-Registered Trademark- are registered trademarks of
the Company. This Prospectus also contains trademarks of other companies.
 
                             ---------------------
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE  COMPANY AT  A LEVEL ABOVE  THAT WHICH  MIGHT OTHERWISE PREVAIL  IN THE OPEN
MARKET. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
    IN CONNECTION WITH  THIS OFFERING, CERTAIN  UNDERWRITERS (AND SELLING  GROUP
MEMBERS) MAY ENGAGE IN PASSIVE MARKET MAKING TRANSACTIONS IN THE COMMON STOCK ON
THE  NASDAQ NATIONAL MARKET IN ACCORDANCE  WITH RULE 10B-6A UNDER THE SECURITIES
EXCHANGE ACT OF 1934. SEE "UNDERWRITING."
 
                                       2
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION AND FINANCIAL  STATEMENTS AND NOTES  THERETO APPEARING ELSEWHERE  IN
THIS PROSPECTUS, INCLUDING INFORMATION UNDER "RISK FACTORS." EXCEPT AS OTHERWISE
NOTED,  ALL  INFORMATION IN  THIS  PROSPECTUS, INCLUDING  FINANCIAL INFORMATION,
SHARE  AND  PER   SHARE  DATA,   ASSUMES  NO  EXERCISE   OF  THE   UNDERWRITERS'
OVER-ALLOTMENT OPTION. SEE "UNDERWRITING."
 
                                  THE COMPANY
 
    NPS  Pharmaceuticals is engaged  in the discovery  and development of orally
active, small  molecule  drugs  that  target  cell  surface  receptors  and  ion
channels.  The Company's most advanced  product candidate, Norcalcin-TM- for the
treatment of hyperparathyroidism  ("HPT"), arose from  the Company's  pioneering
work  on  a  new  class  of  cell  surface  receptors  which  detect  levels  of
extracellular calcium  involved  in  numerous bodily  functions.  To  date,  the
Company  has  conducted  two Phase  I  and  two Phase  I/II  clinical  trials of
Norcalcin to test its safety and initial efficacy. The Company is also  applying
its   calcium  receptor   technology  to   the  development   of  therapies  for
osteoporosis. The  Company's  other main  programs  involve the  development  of
orally  active, small molecule  drugs which have  neuroprotectant properties and
target certain calcium channels in order to provide treatments for stroke,  head
trauma, chronic pain and epilepsy. Additionally, the Company is pursuing several
discovery  programs which are extensions of its discoveries in calcium receptors
and ion channels.
 
    NPS has established  research collaborations and  license arrangements  with
the  pharmaceutical  division of  Kirin Brewery  Company, Limited  ("Kirin") and
SmithKline Beecham Corporation ("SmithKline Beecham")  in the fields of HPT  and
osteoporosis, respectively, and has established a license arrangement with Amgen
Inc.  ("Amgen") in  the field  of HPT. Kirin,  SmithKline Beecham  and Amgen are
referred to herein  as the "Licensees."  The Licensees are  responsible for  all
costs of product development in their respective territories and fields. As part
of  these arrangements,  the Licensees  have paid to  NPS an  aggregate of $21.0
million in non-refundable license fees and Amgen and an affiliate of  SmithKline
Beecham  have purchased $14.5 million of  the Company's Common Stock. The shares
of Common Stock purchased by Amgen are being registered with the Securities  and
Exchange  Commission by the Company for resale. Amgen has agreed not to sell any
of these shares for a  period of 90 days after  the date of this Prospectus.  In
addition,  the Licensees have  agreed to make  up to $56.0  million in milestone
payments, of which $3.0 million has been  paid to the Company to date under  the
SmithKline Beecham agreement. SmithKline Beecham and Kirin are also obligated to
pay  an aggregate of  approximately $11.3 million  in research support payments.
Each of the Licensees is obligated to pay royalties to NPS on any product sales.
See  "Risk  Factors  --  Dependence   on  Collaborative  Research  and   License
Relationships" and "Business -- Collaborative Research and License Agreements."
 
    HPT  is a  growing medical concern  and is typically  characterized as being
either primary or secondary. Primary HPT is an age-related disorder that results
from excessive secretion  of parathyroid  hormone ("PTH"),  leading to  elevated
levels of calcium in the blood. Symptoms may include bone loss, muscle weakness,
depression  and cognitive  dysfunction. Approximately  100,000 new  patients are
diagnosed with primary HPT in the  United States each year. There are  currently
no pharmaceutical therapies for the treatment of primary HPT, with surgery being
the  only effective treatment.  Secondary HPT results  from other disease states
and is most often associated with  renal dysfunction. Symptoms of secondary  HPT
include  excessive  bone loss,  bone pain,  and chronic,  severe itching.  It is
estimated that approximately 80% of the  patients in the United States who  rely
on  kidney dialysis, or approximately 140,000  patients, suffer from the effects
of secondary HPT. The Company believes that current drug therapy treatments  for
secondary   HPT,  such  as  phosphate   binders  and  calcitriol,  have  certain
disadvantages.
 
    The Company's preliminary analysis of the data from its four clinical trials
of Norcalcin  indicates that  Norcalcin was  safe and  well tolerated  in  these
studies  and  that  the  administration of  Norcalcin  resulted  in  an expected
dose-dependent decrease in the level of PTH in the blood. The higher doses  used
in  the Phase  I studies  and in  the Phase  I/II dialysis  study resulted  in a
decrease in the level of calcium in  the blood. The Company expects to  complete
the  formal  analysis  from  all  four trials  and  to  report  its  findings in
appropriate  forums  during  the  latter  half  of  1996.  Amgen  is   currently
formalizing its clinical
 
                                       3
<PAGE>
strategy  for the continued  development of Norcalcin,  and the Company believes
Kirin will begin Phase I  clinical trials of Norcalcin  in Japan in 1996.  There
can  be no assurance that the clinical  trials will proceed as indicated or that
Norcalcin will prove safe and effective, meet applicable regulatory standards or
be  successfully  marketed.  See  "Risk  Factors  --  Early  Stage  of   Product
Development;  Dependence  on Norcalcin"  and  " --  Dependence  on Collaborative
Research and License Relationships."
 
    In conjunction with  SmithKline Beecham,  NPS is also  applying its  calcium
receptor  technology to  the development of  orally active  therapeutics for the
treatment of  osteoporosis. Osteoporosis  is an  age-related disorder  affecting
more  than 200  million people  worldwide and  is characterized  by reduced bone
density and  an increased  susceptibility  to fractures.  Among the  elderly  in
particular,  osteoporosis  is  a major  cause  of morbidity  and  mortality. The
Company  is  pursuing  two  approaches   for  the  treatment  of   osteoporosis,
stimulation   of  bone  formation  and  suppression  of  bone  resorption.  Most
osteoporosis patients  are first  diagnosed only  after they  have already  lost
significant bone mass. As a result, the Company believes that a therapy that not
only  halts further  bone loss,  but also  builds new  bone, would  constitute a
significant  advancement   in  the   treatment   of  osteoporosis.   Under   its
collaboration  with SmithKline Beecham, research  efforts are being conducted by
NPS concurrently  on  both approaches  to  osteoporosis. In  January  1996,  the
Company received a milestone payment of $3.0 million from SmithKline Beecham for
progress made in its osteoporosis program.
 
    The  Company  is developing  a new  class of  orally active  compounds which
modulate certain calcium channels for neuroprotection in stroke and head  trauma
and  also for chronic pain and epilepsy. The influx of calcium through glutamate
receptor-operated calcium channels has been  linked to a number of  neurological
disorders, including nerve cell death following stroke and head trauma, and also
to  certain  types  of  chronic pain  and  epilepsy.  The  Company's proprietary
compounds  antagonize  the  NMDA  (N-methyl-D-aspartate)  subtype  of  glutamate
receptor-operated  calcium channels ("NMDA receptor-channels"), thereby reducing
the influx of calcium. The Company believes that these compounds work through  a
novel mechanism and exhibit potentially advantageous pharmacological properties.
These  compounds  demonstrated  neuroprotectant activity  in  preclinical animal
models of stroke  and head trauma  and palliative activity  in animal models  of
chronic  pain and epilepsy.  The Company has designated  one of these compounds,
NPS 1506, for preclinical development on a time line which currently anticipates
an Investigational New Drug ("IND") filing with the United States Food and  Drug
Administration  (the "FDA") in the first half  of 1997. However, there can be no
assurance that the IND will be filed in this time frame.
 
    The Company is actively engaged in several discovery programs which seek  to
identify  molecular targets for  the development of new  drugs. Among these, the
Company believes it has made significant discoveries with regard to metabotropic
glutamate receptors  ("mGluRs"), having  identified  small molecules  active  at
these  receptors. The Company believes that  drugs acting at specific mGluRs may
provide relevant therapies for a number of neurological disorders.
 
    An investment in the shares of  Common Stock offered hereby involves a  high
degree  of  risk.  The  Company  is currently  in  the  early  stage  of product
development  and  Norcalcin  is  the  only  product  candidate  currently  under
development by the Company or its Licensees that is in human clinical trials. In
addition,    because   the   Company    has   granted   exclusive   development,
commercialization and marketing rights to its Licensees in the fields of HPT and
osteoporosis, the  success of  its  existing HPT  and osteoporosis  programs  is
dependent  upon the  efforts of  its Licensees.  Other risk  factors include the
Company's lack of product sales, a history of operating losses, the  uncertainty
of  regulatory  approvals,  rapid  technological  change  and  competition,  the
uncertainty of protection of the  Company's patents and proprietary  technology,
the  Company's  dependence on  third  parties for  manufacturing,  the Company's
future capital needs and  the uncertainty of  additional funding, the  Company's
lack  of marketing  capabilities, the uncertainty  of third-party reimbursement,
the Company's dependence on  key personnel and the  Company's ability to  manage
growth. See "Risk Factors."
 
    NPS was incorporated in Utah in 1986 and reincorporated in Delaware in 1992.
The  Company's executive offices are located at 420 Chipeta Way, Salt Lake City,
Utah 84108-1256, and its telephone number is (801) 583-4939.
 
                                       4
<PAGE>
                                  THE OFFERING
 
   
<TABLE>
<S>                                               <C>
Common Stock offered............................  3,000,000 shares
Common Stock to be outstanding after the          11,187,232 shares (1)
 Offering.......................................
Use of proceeds.................................  To fund research and development,  capital
                                                  expenditures  and for  working capital and
                                                  other general corporate purposes.
Nasdaq National Market symbol...................  NPSP
</TABLE>
    
 
                             SUMMARY FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                        OCTOBER 22,
                                                                                                           1986
                                                                                                        (INCEPTION)
                                                               YEAR ENDED DECEMBER 31,                    THROUGH
                                                -----------------------------------------------------  DECEMBER 31,
                                                  1991       1992       1993       1994       1995         1995
                                                ---------  ---------  ---------  ---------  ---------  -------------
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
  Revenues from research and license
   agreements.................................  $   1,885  $   1,259  $     868  $   3,861  $   9,562   $    22,316
  Operating expenses:
    Research and development..................      1,609      2,722      6,021      7,765      8,727        30,360
    General and administrative................        754      1,283      2,004      3,122      3,975        12,789
                                                ---------  ---------  ---------  ---------  ---------  -------------
      Total operating expenses................      2,363      4,005      8,025     10,887     12,702        43,149
                                                ---------  ---------  ---------  ---------  ---------  -------------
  Operating loss..............................       (478)    (2,746)    (7,157)    (7,026)    (3,140)      (20,833)
  Net loss....................................  $    (462) $  (2,607) $  (7,159) $  (6,756) $  (3,318)  $   (20,517)
                                                ---------  ---------  ---------  ---------  ---------  -------------
                                                ---------  ---------  ---------  ---------  ---------  -------------
  Net loss per share (2)......................  $    (.33) $    (.95) $   (1.91) $   (1.13) $    (.48)
                                                ---------  ---------  ---------  ---------  ---------
                                                ---------  ---------  ---------  ---------  ---------
  Weighted average shares outstanding (2).....      1,386      2,746      3,751      5,977      6,924
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                                                   DECEMBER 31, 1995
                                                                      -------------------------------------------
                                                                                                  PRO FORMA AS
                                                                       ACTUAL    PRO FORMA (3)   ADJUSTED (3)(4)
                                                                      ---------  -------------  -----------------
<S>                                                                   <C>        <C>            <C>
BALANCE SHEET DATA:
  Cash, cash equivalents and marketable investment securities.......  $   8,340   $    25,840      $    67,615
  Working capital...................................................      5,832        23,172           64,947
  Total assets......................................................     10,600        28,100           69,875
  Long-term portion of capital leases and long-term debt............        747           747              747
  Deficit accumulated during development stage......................    (20,517)      (10,677)         (10,677)
  Stockholders' equity..............................................      7,322        24,662           66,437
</TABLE>
    
 
- - ------------------
   
(1) Based upon shares outstanding as of March 31, 1996. Excludes: (i)  1,459,331
    shares  which were subject to  outstanding options as of  March 31, 1996, at
    exercise prices ranging  from $0.34  to $14.50  per share,  with a  weighted
    average  exercise price of $3.29 per  share, and (ii) 32,542 shares issuable
    upon exercise of outstanding  warrants with an exercise  price of $3.69  per
    share.  See "Management --  Directors' Compensation," "--  1987 Stock Option
    Plan," "-- 1994  Equity Incentive  Plan," "Description of  Capital Stock  --
    Warrant" and Note 6 of Notes to Financial Statements.
    
 
(2) See  Note 1 of Notes to  Financial Statements for information concerning the
    computation of net loss per share.
 
(3) Pro forma balance  sheet data  reflects the receipt  from Amgen  of a  $10.0
    million  non-refundable license fee in March  1996, net of applicable taxes,
    and the sale of 1,000,000 shares of  Common Stock to Amgen for $7.5  million
    also  received in  March 1996. See  "Business --  Collaborative Research and
    License Agreements."
 
   
(4) As further adjusted to give effect to the sale of 3,000,000 shares of Common
    Stock offered by the Company hereby, after deducting underwriting  discounts
    and  commissions and  the estimated  expenses of  the Offering.  See "Use of
    Proceeds" and "Capitalization."
    
 
                               ------------------
 
    THIS  PROSPECTUS   CONTAINS,   IN  ADDITION   TO   HISTORICAL   INFORMATION,
FORWARD-LOOKING  STATEMENTS THAT INVOLVE RISKS  AND UNCERTAINTIES. THE COMPANY'S
ACTUAL RESULTS OR EXPERIENCE COULD DIFFER SIGNIFICANTLY FROM THOSE DISCUSSED  IN
THE  FORWARD-LOOKING STATEMENTS. FACTORS THAT COULD  CAUSE OR CONTRIBUTE TO SUCH
DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED IN "RISK  FACTORS,"
AS WELL AS THOSE DISCUSSED ELSEWHERE IN THIS PROSPECTUS.
 
                                       5
<PAGE>
                                  RISK FACTORS
 
    IN  ADDITION  TO THE  OTHER INFORMATION  IN  THIS PROSPECTUS,  THE FOLLOWING
FACTORS SHOULD BE CONSIDERED CAREFULLY  BY POTENTIAL INVESTORS IN EVALUATING  AN
INVESTMENT IN THE SHARES OF COMMON STOCK OFFERED HEREBY.
 
    EARLY  STAGE OF PRODUCT  DEVELOPMENT; DEPENDENCE ON  NORCALCIN.  The Company
was founded in 1986, and has not completed development of any drugs and does not
expect that  any  drugs  resulting  from its  or  its  Licensees'  research  and
development efforts will be commercially available for several years, if at all.
Norcalcin  is  the only  product candidate  currently  under development  by the
Company and its Licensees  that is in human  clinical trials. No other  compound
under  development  by NPS  or  its Licensees  has  been scheduled  for clinical
testing. Clinical trials in humans are  necessary to determine whether or not  a
compound  will be  a safe,  commercially attractive  or effective  drug. Results
obtained in preclinical trials  are not necessarily  indicative of results  that
will be obtained in later stages of preclinical development or in human clinical
testing.  All  product candidates  developed by  the  Company or  its Licensees,
including  Norcalcin,   will  require   extensive  research,   development   and
preclinical   and  clinical  testing  prior  to  submission  of  any  regulatory
application, as well as a  lengthy regulatory approval process. Preclinical  and
clinical  testing  of safety  and  efficacy takes  several  years, and  the time
required to commercialize new drugs  cannot be predicted with accuracy.  Product
development  of  new  pharmaceuticals  is  highly  uncertain,  and unanticipated
developments, clinical or regulatory delays, unexpected adverse side effects  or
inadequate  therapeutic efficacy could  slow or prevent  the product development
efforts of the Company and its  Licensees, and have a materially adverse  effect
on  the  Company's operations.  There  can be  no  assurance that  the Company's
current  product  candidates,  including   Norcalcin,  or  any  future   product
candidates,  will advance  to clinical  trials, prove  safe and  effective, meet
applicable regulatory  standards, be  capable of  being produced  in  commercial
quantities at acceptable cost or be successfully marketed. Also, there can be no
assurance  that a pharmacological method for  the treatment of diseases targeted
by the Company, including HPT, will prove to be superior to  non-pharmacological
treatments.  See "Business -- Product Development Programs" and "Risk Factors --
Government Regulation; No Assurance of Regulatory Approval."
 
    DEPENDENCE  ON  COLLABORATIVE  RESEARCH  AND  LICENSE  RELATIONSHIPS.    The
Company's  strategy for the development,  clinical testing and manufacturing and
commercialization of  certain of  its product  candidates and  the research  and
development  of new product candidates  includes entering into various research,
development and  license  agreements  with  corporate  partners,  licensees  and
others.  The Company has entered into a license agreement with Amgen pursuant to
which Amgen  has assumed  control of  the development  and commercialization  of
Norcalcin  in its territory, a collaborative research and license agreement with
Kirin for the development of Norcalcin in Kirin's territory and a  collaborative
research  and  license  agreement  with  SmithKline  Beecham  for  research  and
development in osteoporosis. The Licensees  each have received from NPS  certain
exclusive  rights  to commercialize  products  developed under  their respective
agreements, have paid license fees to  NPS and have committed to make  milestone
payments  to NPS upon achievement of  specified goals. The Licensees have agreed
to fund the  research or development  efforts in HPT  and osteoporosis,  conduct
human  clinical  testing of  lead compounds,  prepare  and file  submissions for
regulatory approval and  pay royalties  on any resulting  products. Because  the
Company  has  granted  exclusive  development,  commercialization  and marketing
rights to the Licensees in  the fields of HPT  and osteoporosis, the success  of
its  existing HPT and osteoporosis programs is dependent upon the efforts of the
Licensees. There  can be  no assurance  that the  Licensees will  perform  their
obligations  under  their  respective agreements,  that  they  will successfully
develop or proceed to  market any products under  these agreements, or that  the
Company  will  ever  receive  any royalties  or  milestone  or  research support
payments under these  agreements, any  of which  could have  a material  adverse
effect  on the business of  the Company. Furthermore, there  can be no assurance
that business conflicts  will not  arise between  the Licensees  over rights  to
existing  compounds or future compounds with respect to certain indications. The
Company's  collaborative  research   and  license   agreements,  including   the
agreements  with the  Licensees, generally provide  that they  may be terminated
under a  variety of  circumstances upon  prior  written notice.  If any  of  the
Licensees  terminates or breaches its agreement,  such termination or breach may
have a material adverse effect on the
 
                                       6
<PAGE>
Company's operations. Furthermore,  there can  be no assurance  that present  or
future  collaborators will  not pursue  existing or  alternative technologies in
preference to treatments being developed in collaboration with the Company.
 
    NPS also intends to seek additional collaborative or license arrangements to
develop and  commercialize  other  product candidates.  Many  of  the  Company's
competitors  are similarly seeking to develop  or expand their collaborative and
license arrangements with pharmaceutical companies. The success of these efforts
by the  Company's competitors  could have  an adverse  impact on  the  Company's
ability  to form future  collaborative arrangements and  maintain existing ones.
There can be no assurance that the Company will be able to negotiate  acceptable
collaborative   agreements  in  the  future  or  that  efforts  under  any  such
collaborative agreements  will be  successful. To  the extent  that the  Company
chooses  not to or is  unable to enter into  future collaborative agreements, it
would  experience  increased   capital  requirements   to  undertake   research,
development  and  marketing of  its product  candidates at  its own  expense. In
addition, the  Company  may  encounter significant  delays  in  introducing  its
product   candidates  into  certain  markets   or  find  that  the  development,
manufacture or  sale of  its product  candidates in  such markets  is  adversely
affected  by  the absence  of such  collaborative  agreements. See  "Business --
Product  Development   Programs,"  "--   Collaborative  Research   and   License
Agreements" and "--Manufacturing."
 
    LACK  OF PRODUCT SALES;  HISTORY OF OPERATING LOSSES.   Substantially all of
the Company's revenues to date have come from collaborative research and license
agreements with the Licensees. Aside from the incidental revenues from the  sale
of research chemicals, no revenues have been generated from product sales. Other
working  capital  has come  from equity  and debt  financings. NPS  has incurred
cumulative losses through December 31, 1995 of $20.5 million, net of  cumulative
revenues  from research  and license  agreements of  $22.3 million.  The Company
expects to incur  significant operating losses  over at least  the next  several
years  as the  Company continues  and expands  its research  and development and
preclinical and clinical  testing activities.  The Company  expects that  losses
will  fluctuate  from  quarter to  quarter  and  that such  fluctuations  may be
substantial. The Company's ability to achieve profitability depends in part upon
its ability, alone  or with  others, to  complete development  of Norcalcin  and
other  product candidates, obtain required  regulatory approvals and manufacture
and successfully market such  products, of which there  can be no assurance.  As
such,  there  can be  no  assurance that  the Company  will  be able  to achieve
profitability on a sustained basis, if at all. See "Management's Discussion  and
Analysis  of Financial  Condition and  Results of  Operations" and  "Business --
Product Development Programs."
 
    GOVERNMENT REGULATION; NO  ASSURANCE OF REGULATORY  APPROVAL.  The  research
and  development  activities  of  the Company,  as  well  as  the investigation,
manufacture, distribution and marketing of therapeutic products, are subject  to
extensive  regulation by numerous governmental  authorities in the United States
and other  countries. Prior  to marketing  in  the United  States, a  drug  must
undergo  rigorous preclinical and  clinical testing and  an extensive regulatory
approval process implemented by the FDA under federal law, including the Federal
Food, Drug and  Cosmetic Act, as  amended. Receipt of  such regulatory  approval
involves,  among other things, satisfying the FDA  that the product is both safe
and effective. Typically,  this process  takes several years  or more  depending
upon  the type,  complexity and  novelty of  the product  and the  nature of the
disease or  other indication  to  be treated  and  requires the  expenditure  of
substantial resources. Preclinical studies must be conducted in conformance with
the  FDA's  Good Laboratory  Practice  regulations. Clinical  testing  must meet
requirements for Institutional  Review Board oversight  and informed consent  by
clinical trial subjects and patients, as well as FDA prior review, oversight and
the FDA's Good Clinical Practice requirements. Clinical trials may require large
numbers  of  test subjects.  Furthermore,  the Company  or  the FDA  may suspend
clinical trials at any time if  either believes that the subjects  participating
in  such  trials  are  being exposed  to  unacceptable  health  risks, including
undesirable or unintended side effects. While certain of the Company's employees
have some experience in conducting  and managing the clinical testing  necessary
to  obtain regulatory approval, the Company  has conducted only limited clinical
trials of one of  its product candidates  to date and  anticipates that it  will
need  to  either  rely  on its  collaborative  partners,  licensees  and outside
consultants or attract and  retain additional employees  with expertise in  this
area.
 
                                       7
<PAGE>
    Before  receiving  FDA  approval  to  market  a  product,  NPS  may  have to
demonstrate that such product represents an improved form of treatment  compared
to  existing therapies. Data  obtained from preclinical  and clinical activities
are susceptible to varying interpretations  which could delay, limit or  prevent
regulatory approvals. In addition, delays or rejections may be encountered based
upon  additional government regulation from future legislation or administrative
action or  changes in  FDA  policy during  the  period of  product  development,
clinical  trials and FDA regulatory review.  If regulatory approval of a product
is granted, such approval will be limited to those disease states and conditions
for which  the product  is  useful, as  demonstrated through  clinical  studies.
Furthermore,   approval  may  entail  ongoing  requirements  for  post-marketing
studies. Even if such regulatory approval  is obtained, a marketed product,  its
manufacturer  and its manufacturing  facilities are subject  to continual review
and  periodic   inspections.  The   regulatory   standards  for   current   Good
Manufacturing  Practices ("cGMP") are currently being applied stringently by the
FDA. Discovery of previously  unknown problems with  a product, manufacturer  or
facility  may result in restrictions on  such product or manufacturer, including
costly recalls or even withdrawal of the  product from the market. There can  be
no  assurance that any compound developed by the Company alone or in conjunction
with others will prove to be safe and effective in clinical trials and will meet
all of  the  applicable  regulatory requirements  needed  to  receive  marketing
approval.
 
    RAPID  TECHNOLOGICAL CHANGE; INTENSE COMPETITION.   NPS is pursuing areas of
product development  in which  the Company  believes there  is a  potential  for
extensive  technological  innovation in  relatively short  periods of  time. The
Company operates in a field in which  new discoveries occur and are expected  to
occur  at  a rapid  pace. The  Company's competitors  may succeed  in developing
technologies or products that are more effective than those of the Company or in
obtaining regulatory approvals of their drugs more rapidly than the Company  and
its  collaborative partners  and licensees,  and such  success could  render the
Company's products  obsolete  or non-competitive  and  have a  material  adverse
effect  on  the Company.  Competition  in the  pharmaceutical  and biotechnology
industry is  intense  and is  expected  to continue  to  increase. Many  of  the
Company's competitors, including biotechnology and pharmaceutical companies, are
actively  engaged in the  research and development of  products in the Company's
targeted areas,  including the  fields  of HPT,  osteoporosis,  neuroprotection,
chronic  pain and epilepsy. Many of the Company's competitors have substantially
greater financial, technical, marketing and personnel resources than the Company
as well as considerable experience in preclinical testing, human clinical trials
and  other   regulatory   approval  procedures.   Moreover,   certain   academic
institutions,   governmental  agencies  and  other  research  organizations  are
conducting research in areas in which the Company is working. These institutions
are becoming increasingly aware  of the commercial value  of their findings  and
are becoming more active in seeking patent protection and licensing arrangements
to  collect  royalties for  use of  technology that  they have  developed. These
institutions may also  market competitive  commercial products on  their own  or
through  joint ventures and  will compete with the  Company in recruiting highly
qualified scientific personnel. See "Business -- Product Development  Programs,"
"-- Patents and Proprietary Technology" and "-- Competition."
 
    UNCERTAINTY  OF  PROTECTION  OF  PATENTS AND  PROPRIETARY  TECHNOLOGY.   The
Company's success depends, in part, on  its ability to obtain patents,  maintain
trade secret protection and operate without infringing on the proprietary rights
of   third  parties.   Because  the   patent  positions   of  biotechnology  and
pharmaceutical companies can be highly uncertain and frequently involve  complex
legal  and factual questions, the breadth of claims allowed in biotechnology and
pharmaceutical patents or their enforceability cannot be predicted.
 
    None of the Company's principal proprietary rights, including rights related
to process, compounds, use and technique related to its calcium receptor science
and NMDA receptor-channel  technology, are  protected by issued  patents in  the
Company's  principal potential markets.  No assurance can  be given that patents
will issue from any of the Company's current or anticipated patent  applications
or  that such patent applications will allow the Company to preclude others from
practicing some or all of the  art described in the publicly available  versions
of  these  pending patent  applications either  before such  patent applications
issue as patents or after such patent applications issue as patents.  Generally,
 
                                       8
<PAGE>
patent applications in the United States are maintained in secrecy until patents
issue  and publication of  discoveries in scientific  or patent literature often
lag behind  actual  discoveries.  No  assurance  can  be  given  that,  even  if
published, the Company is aware of all such literature. Accordingly, the Company
cannot  be certain that the named inventors  in its patent applications were the
first to invent, or that the Company is the first to pursue patent coverage  for
such  inventions. If patents do issue, there can be no assurance that the claims
allowed will be  sufficiently broad to  protect the Company's  technology or  to
prevent  competition. No assurance can  be given that any  patents issued to the
Company will  not be  challenged,  invalidated or  circumvented or  that  rights
granted  thereunder will  provide competitive  advantages to  NPS. Moreover, the
Company may  have to  participate in  interference proceedings  declared by  the
United  States Patent and  Trademark Office to  determine priority of invention,
which could result  in substantial  cost to the  Company, even  if the  eventual
outcome  is  favorable  to  the  Company. If  certain  of  the  Company's patent
applications fail to  issue or are  successfully challenged, particularly  those
related to its calcium receptor science and NMDA receptor-channel technology, it
may have a material adverse effect on the Company's operations or its ability to
maintain  or establish  collaborations. Furthermore,  there can  be no assurance
that others will not  independently develop similar  products, duplicate any  of
the  Company's products  or design  around the  patented products  or technology
developed by NPS. There can also be no assurance that any products developed  by
NPS  will not be  found to infringe patents  held by third  parties, or that, in
such cases, licenses from such third parties would be available on  commercially
attractive  terms, if  at all. If  NPS does  not obtain such  licenses, it could
encounter delays in product market introductions or could find that it is unable
to develop,  manufacture  or  sell  its products  requiring  such  licenses.  In
addition,  the  Company  could  incur substantial  costs  in  defending lawsuits
brought against NPS on  such patents or in  prosecuting lawsuits by NPS  against
another  party. Additionally, many of  the Company's foreign patent applications
have been published as part of the patent prosecution process in such countries.
Protection of the rights revealed in  such published patent applications can  be
complex, costly and uncertain.
 
    The  development of therapeutic  products for applications  in the Company's
product fields is intensely competitive.  A number of pharmaceutical  companies,
biotechnology  companies,  universities  and  research  institutions  have filed
patent applications or  received patents in  these and related  fields. Some  of
these  applications or patents may limit  or preclude the Company's applications
and could result  in a significant  reduction of the  coverage of the  Company's
patents, if issued.
 
    NPS also relies on trade secrets and proprietary know-how, which it seeks to
protect,   in   part,   by  confidentiality   agreements   with   its  corporate
collaborators, licensees, employees and consultants. NPS expects to continue  to
rely   on  trade  secrets  and  know-how  to  protect  certain  aspects  of  its
technologies. The  Company believes  it  has, and  can maintain,  a  competitive
advantage  through  its use  of written  confidential disclosure  agreements and
invention assignment provisions  with its employees,  consultants, advisors  and
potential  and actual collaborators and licensees. Nonetheless, no assurance can
be given  that  these agreements  will  provide meaningful  protection  for  the
Company's  trade secrets or proprietary know-how  as a result of an unauthorized
use or disclosure in  the public domain.  There can be  no assurance that  these
agreements  will not be breached, that NPS  would have adequate remedies for any
breach, or that the Company's trade  secrets will not otherwise become known  or
be  independently  discovered  by  competitors.  See  "Business  --  Patents and
Proprietary Technology."
 
    DEPENDENCE ON  THIRD  PARTIES FOR  MANUFACTURING.   To  be  successful,  the
Company's   products,  if  successfully  developed,   must  be  manufactured  in
commercial quantities in accordance with  regulations prescribed by the FDA  and
at  acceptable costs. NPS  does not have the  capability to manufacture products
under cGMP regulations prescribed by the FDA and does not intend to develop such
a capability in the near future. Accordingly, the Company anticipates that,  for
the  foreseeable  future,  it  will  pursue  a  strategy  of  seeking production
capability from corporate  collaborators, licensees  or contract  manufacturers.
There  can be no  assurance that the Company's  current or prospective corporate
collaborators, licensees or contract manufacturers  will be able to  manufacture
any developed compounds on a commercial scale or that any collaborator, licensee
or  manufacturer will be able to manufacture products in quantities or at prices
which will be commercially viable or  beneficial for the Company. The  Licensees
are
 
                                       9
<PAGE>
responsible  for  manufacturing any  products  developed under  their respective
agreements with the Company. If the  Company or its collaborators and  licensees
encounter  difficulty  in  obtaining third-party  manufacturing  on commercially
acceptable terms,  their ability  to commercialize  products may  be delayed  or
foreclosed.  Moreover, any manufacturer of the Company's products must adhere to
cGMP regulations enforced by the FDA through its facilities inspection  program.
If these facilities cannot pass a pre-approval or periodic plant inspection, FDA
approval  of the  product will  not be  granted or  sale of  the product  may be
barred.
 
    Presently, the  Company  relies on  contract  manufacturers to  produce  its
proprietary  compounds for  development activities and  in sufficient quantities
for preclinical and clinical  purposes. If the Company  were unable to  contract
for  sufficient supply  of its  compounds on acceptable  terms, or  if it should
encounter delays or  difficulties in its  relationships with manufacturers,  the
Company's preclinical and human clinical testing schedule would be delayed. Such
delay  would  adversely  affect  the schedule  for  submission  of  products for
regulatory approval and  the market  introduction and subsequent  sales of  such
products, which would have a materially adverse effect on the Company.
 
    FUTURE  CAPITAL NEEDS; UNCERTAINTY  OF ADDITIONAL FUNDING.   The Company has
incurred negative cash  flows from operations  since its inception.  Substantial
expenditures  will be  required to  enable NPS  to conduct  existing and planned
preclinical studies and clinical trials, to manufacture or to have  manufactured
and  to market  products from current  research and development  efforts, and to
continue research and development activities.  The Company anticipates that  its
existing  capital resources, including research and development support payments
from existing collaborations, together with the net proceeds of the Offering and
interest earned thereon, will be sufficient to enable it to maintain its current
and planned  operations through  at least  1997. However,  the Company's  future
capital  needs will  be dependent upon  many factors, including  progress in its
research  and  development  activities,  the   magnitude  and  scope  of   these
activities,   progress  with  preclinical  and  clinical  trials,  the  cost  of
preparing, filing,  prosecuting, maintaining  and  enforcing patent  claims  and
other   intellectual  property   rights,  competing   technological  and  market
developments, changes in or terminations of existing collaborative  arrangements
and  license  arrangements, the  establishment  of additional  collaborative and
license arrangements, and the cost of manufacturing scale-up and development  of
marketing  activities, if  undertaken by  the Company.  If Amgen  terminates its
agreement to develop Norcalcin in the Amgen territory, the Company may not  have
the  resources necessary  to complete  the development  and commercialization of
Norcalcin in the Amgen territory.  See "Management's Discussion and Analysis  of
Financial  Condition  and  Results of  Operations,"  "Business  -- Collaborative
Research and License Agreements," and "Use of Proceeds."
 
    Depending on the factors described above, NPS may need to raise  substantial
additional   funds   to   support   its   long-term   product   development  and
commercialization programs.  The  Company  intends to  seek  additional  funding
through  corporate  collaborations  and  license  agreements.  There  can  be no
assurance the Company will be able to negotiate such agreements in the future on
acceptable terms,  or at  all.  The Company  may  also seek  additional  funding
through  public or private financings. If additional funds are raised by issuing
equity securities, further  dilution to  stockholders will  result. If  adequate
funds  are not available, the Company may be required to delay, reduce the scope
of or eliminate  one or  more of  its research  and development  programs or  to
obtain funds through arrangements with collaborative partners or others that may
require the Company to relinquish rights to certain of its technologies, product
candidates  or  products  that the  Company  may  otherwise seek  to  develop or
commercialize on its own, any one of which could have a material adverse  effect
on  the  Company's  operations.  See "Management's  Discussion  and  Analysis of
Financial Condition and Results of Operations."
 
    LACK OF MARKETING CAPABILITIES.  The Licensees currently have marketing  and
distribution rights with respect to products under development for the treatment
of  HPT and osteoporosis;  however, such commercialization  rights may revert to
NPS, under  certain circumstances,  including  upon termination  of any  of  the
related  agreements. NPS may  retain commercialization rights  to other products
developed in  the  future. The  Company  currently lacks  sales,  marketing  and
distribution  capability. In order  to market any of  its products directly, the
Company  would   have   to   develop   a  marketing   and   sales   force   with
 
                                       10
<PAGE>
technical expertise and with supporting distribution capability. There can be no
assurance  that  the  Company  will  be able  to  establish  in-house  sales and
distribution capabilities or relationships with  third parties, or that it  will
be successful in gaining market acceptance for its products.
 
    Outside  the United  States, the  Company's ability  to market  a product is
contingent upon receiving marketing  authorization from the appropriate  foreign
regulatory  authorities.  The  requirements governing  the  conduct  of clinical
trials, marketing  authorization, pricing  and  reimbursement vary  widely  from
country to country. This foreign regulatory approval process includes all of the
risks  associated with FDA approval set forth above. See "Business -- Government
Regulation."
 
    UNCERTAINTY OF  THIRD-PARTY REIMBURSEMENT.   There  is significant  national
concern  today about  the availability  and rising  cost of  health care  in the
United States. It is anticipated that new federal and/or state legislation  will
be  passed  and regulations  adopted to  attempt to  provide broader  and better
health care and to manage and contain its cost. While NPS cannot predict whether
any such legislative or regulatory proposals will be adopted or the effect  such
proposals  may have on its business, the pendency of such proposals could have a
material adverse  effect on  the Company's  ability to  raise capital,  and  the
adoption  of such proposals could have a  material adverse effect on the Company
in general.
 
    In both  domestic  and  foreign  markets, sales  of  the  Company's  product
candidates  will  depend  in  part on  the  availability  of  reimbursement from
third-party payors such as government health administration authorities, private
health insurers and other organizations. Under current guidelines, Medicare does
not reimburse patients  for self-administered drugs.  Such policy may  adversely
affect  the  market for  products designed  to  treat patients  with age-related
disorders, such as  HPT and  osteoporosis. In addition,  third-party payors  are
increasingly  challenging the  price and cost-effectiveness  of medical products
and services. Significant uncertainty exists  as to the reimbursement status  of
newly  approved  health  care  products.  There can  be  no  assurance  that the
Company's product candidates will be considered cost-effective or that  adequate
third-party  reimbursement will  be available  to enable  NPS to  maintain price
levels sufficient to realize an appropriate return on its investment in  product
development.  Failure to  achieve sufficient  price levels  for its  drugs could
adversely affect the Company's  business. Legislation and regulations  affecting
the  pricing of pharmaceuticals  may change before any  of the Company's product
candidates  are  approved  for  marketing.  Adoption  of  such  legislation   or
regulations could further limit reimbursement for medical products and services.
Furthermore,  the  Company's  ability  to  commercialize  its  potential product
portfolio may be adversely  affected to the extent  that such legislation has  a
material  adverse effect on the  business, financial condition and profitability
of other companies that are current  or future collaborators for certain of  the
Company's product candidates.
 
    DEPENDENCE  ON  KEY PERSONNEL;  ABILITY TO  MANAGE GROWTH.   The  Company is
highly dependent  on the  principal  members of  its scientific  and  management
staff.  Loss  of  any of  these  persons  could adversely  affect  the Company's
business. The Company does not  have employment contracts. The Company's  future
success will also depend in large part upon its continued ability to attract and
retain  other highly qualified scientific  and management personnel. The Company
faces competition  for personnel  from other  companies, academic  institutions,
government  entities and other organizations. There can be no assurance that NPS
will be successful in hiring or retaining personnel. In addition, the  Company's
anticipated  growth and expansion into areas and activities requiring additional
expertise,  such  as  clinical  trials,  government  approvals,  production  and
marketing  and general pharmaceutical  company management are  expected to place
increased demands  on the  Company's resources.  These demands  are expected  to
require   the  addition  of   new  management,  research   and  development  and
administrative  personnel,  and  the  development  of  additional  expertise  by
existing  management  personnel.  The failure  to  acquire such  services  or to
develop such  expertise  could materially  adversely  affect prospects  for  the
Company's  success. Certain of these anticipated future needs are expected to be
met through the agreements with the Licensees and potential additional corporate
collaborations, but there can be no assurance that any services provided by  the
Licensees  or other potential corporate collaborators will be sufficient to meet
the Company's personnel  or management  needs. See "Business  -- Employees"  and
"Management."
 
                                       11
<PAGE>
    RISK  OF  PRODUCT  LIABILITY;  USE OF  HAZARDOUS  MATERIALS.    The testing,
marketing and sale of  human therapeutic products  entail significant risks.  If
the  Company  succeeds  in  developing products  under  its  product development
programs, use of such products in clinical trials and the sale of such  products
following  regulatory  approval  may  expose  the  Company  to  liability claims
allegedly resulting  from use  of  such products.  These  claims might  be  made
directly  by consumers or others.  NPS currently has an  aggregate of $5 million
insurance for the clinical trials of  Norcalcin. There can be no assurance  that
NPS  will be able to maintain such insurance or obtain similar insurance for any
of its future clinical trials or that  coverage will be in sufficient amount  to
protect  against damages for liability that could have a material adverse effect
on NPS. There  can also  be no  assurance that  NPS will  be able  to obtain  or
maintain  product liability  insurance in the  future on acceptable  terms or in
sufficient amounts to  protect the  Company against damages  for liability  that
could  have a material  adverse effect on  the Company. The  agreements with the
Licensees each  provide for  certain indemnification  against such  claims,  but
there  can  be no  assurance  that any  claim arising  from  products sold  by a
collaborative partner or licensee would not also include claims directly against
NPS or that any such claim would be indemnifiable under such agreement.
 
    In addition, the Company's research  and development activities involve  the
controlled   use  of  hazardous  materials,   radioactive  compounds  and  other
chemicals. The  Company is  required to  comply with  complex local,  state  and
federal  regulations involving the use, storage  and handling of these materials
and may  incur  certain  costs  in complying  therewith.  Although  the  Company
believes that its safety procedures for handling and disposing of such materials
comply  with the standards  prescribed by local,  state and federal regulations,
the possibility of unintended non-compliance  with such regulations or the  risk
of  accidental contamination or injury from these materials cannot be completely
eliminated. In the event of such an  accident, the Company could be held  liable
for  any damages that result, and any  such liability could exceed the resources
of the  Company.  The  Company  may  incur  substantial  costs  to  comply  with
environmental regulations.
 
    The  Company  contracts  with  third parties  to  remove  biohazardous waste
generated by the Company. The disposal of such waste, third-party waste disposal
companies contracted by the Company, and  their disposal sites are regulated  by
the  Environmental Protection Agency ("EPA"). The EPA has initiated cleanup of a
site where a waste disposal firm  contracted by the Company disposed of  certain
waste  generated by the Company. The Company  has not accrued any liability with
respect to this matter. Although the Company was a small contributor to the site
and  the  Company  believes  that  there  are  a  number  of  other  financially
responsible contributors, there can be no assurance that the Company will not be
held  liable for  all or a  portion of  the cleanup cost  or any  other costs or
damages associated  with  this disposal  site.  See "Business  --  Environmental
Liability."
 
    VOLATILE  STOCK PRICE.  The market price of the shares of Common Stock, like
that of  the common  stock  of many  other biotechnology  and  biopharmaceutical
companies,  has been and  is likely to  continue to be  highly volatile. Factors
such as  fluctuations  in  the Company's  operating  results,  announcements  of
technological  innovations  or new  commercial products  by  the Company  or its
competitors, progress with clinical trials, governmental regulation, changes  in
reimbursement  policies,  developments in  patent  or other  proprietary rights,
developments in the Company's relationships with current or future collaborative
partners, public concern as to the safety and efficacy of drugs developed by the
Company and its competitors, and general market conditions for biotechnology  or
pharmaceutical  stocks could  have a  significant adverse  effect on  the future
price of the Common Stock.
 
   
    SHARES ELIGIBLE FOR FUTURE SALE; REGISTRATION RIGHTS.  Sales of Common Stock
in the public market  following the Offering or  the perception that such  sales
could  occur could have an adverse effect on the price of the Common Stock. Upon
completion of the Offering,  the Company will have  11,187,232 shares of  Common
Stock  outstanding  (assuming no  exercise  of the  Underwriters' over-allotment
option). Of  these  shares, the  3,000,000  shares  sold in  the  Offering,  the
1,000,000  shares  sold to  Amgen  in March  1996, and,  as  of March  31, 1996,
approximately 3,449,616 additional shares of  Common Stock are freely  tradeable
without   restriction  under   the  Securities  Act.   The  remaining  3,737,616
outstanding shares of Common Stock  are restricted shares ("Restricted  Shares")
under the Securities Act and may only be sold
    
 
                                       12
<PAGE>
   
if  they are registered or qualify for an exemption from registration under Rule
144 or Rule  701 of the  Securities Act. The  Company's directors and  executive
officers  and certain stockholders, including  Amgen, who immediately after this
Offering will hold in the aggregate  4,145,345 shares of Common Stock (of  which
2,968,634 are Restricted Shares) have agreed not to sell any of these shares for
90  days after the date of this  Prospectus without the prior written consent of
Vector Securities International, Inc. Commencing 91  days from the date of  this
Prospectus,  1,835,196 of the Restricted Shares  subject to such agreements will
be available for immediate sale in the public market, subject to certain volume,
manner of  sale and  other limitations  under  Rule 144,  and 1,133,438  of  the
Restricted  Shares will be available for immediate sale without limitation under
Rule 144(k). Of  the 768,982  remaining Restricted  Shares not  subject to  such
agreements,  730,745 shares will  be available for immediate  sale in the public
market under Rule 144(k) and 14,950 shares will be available for immediate sale,
subject to the  limitations provided  in Rule  144. In  addition, following  the
closing  of this Offering, the holders of 3,129,781 Restricted Shares (including
32,542 shares issuable upon exercise of an outstanding warrant) will be entitled
to certain rights with respect  to registration of such  shares for sale in  the
public market. See "Description of Capital Stock -- Registration Rights."
    
 
    CONTROL  BY EXISTING  STOCKHOLDERS; ANTITAKEOVER EFFECTS  OF CERTAIN CHARTER
AND BYLAW PROVISIONS.  The present directors,  executive officers and  principal
stockholders   of  the  Company  and  their  affiliates  will  beneficially  own
approximately 33%  of  the shares  of  Common Stock  outstanding  following  the
Offering  (approximately 32%  if the Underwriters  exercise their over-allotment
option in full). Exercise of stock  options by executive officers and  directors
may  further impact voting  control of the Company.  Accordingly, they will have
the ability to control  the election of the  Company's directors and most  other
stockholders'  actions.  Certain  provisions  of  the  Company's  Certificate of
Incorporation and Bylaws and Section 203 of the Delaware General Corporation Law
could also discourage potential acquisition proposals and could delay or prevent
a change  in  control  of  the  Company.  Such  provisions  could  diminish  the
opportunities  for  a stockholder  to  participate in  tender  offers, including
tender offers at  a price  above the  then current  market value  of the  Common
Stock.  Such provisions may also inhibit fluctuations in the market price of the
Common Stock that could result from takeover attempts. In addition, the Board of
Directors, without further stockholder approval, may issue Preferred Stock  that
could  have the  effect of  delaying or  preventing a  change in  control of the
Company as well as adversely affecting the voting power of the holders of Common
Stock, including  the  loss  of  voting control  to  others.  See  "Management,"
"Principal  Stockholders" and "Description of  Capital Stock -- Preferred Stock"
and "-- Delaware Anti-Takeover Law."
 
   
    DILUTION.  The  Offering price will  be substantially higher  than the  book
value  per share of Common Stock. Investors purchasing shares of Common Stock in
the Offering will therefore  incur immediate and  substantial dilution of  $9.00
per  share. To the  extent that outstanding options  and warrants are exercised,
there will be further dilution to new investors. See "Dilution."
    
 
    ABSENCE OF DIVIDENDS.   The Company  has never paid  any cash dividends  and
does  not  anticipate  paying  cash dividends  in  the  foreseeable  future. See
"Dividend Policy."
 
                                       13
<PAGE>
                                USE OF PROCEEDS
 
   
    The net proceeds to  the Company from  the sale of  the 3,000,000 shares  of
Common  Stock offered  hereby are  estimated to  be approximately  $41.8 million
($48.1 million if the Underwriters' over-allotment option is exercised in full),
after  deducting  underwriting  discounts  and  commissions  and  the  estimated
expenses of the Offering.
    
 
    NPS  expects  to use  the  net proceeds  of the  Offering:  (i) to  fund its
research and  development  programs  not already  sponsored  by  its  Licensees,
including  its programs for  the treatment of stroke,  head trauma, chronic pain
and epilepsy, for which  approximately $7 million is  budgeted for the next  two
years;  (ii) to fund its discovery  programs, for which approximately $6 million
is budgeted for the  next two years; and  (iii) for general corporate  purposes,
including  capital expenditures  and working capital.  The amount  and timing of
expenditures will depend upon  numerous factors, including  the progress of  the
Company's  research and development  programs, the magnitude  and scope of these
activities,  progress  with  preclinical  and  clinical  trials,  the  cost   of
preparing,  filing,  prosecuting, maintaining  and  enforcing patent  claims and
other  intellectual  property   rights,  competing   technological  and   market
developments,  changes in or  terminations of existing  collaborative or license
arrangements, the establishment of additional collaborative arrangements and the
cost of  manufacturing  scale-up and  development  of marketing  activities,  if
undertaken  by the Company. Furthermore, the net proceeds of the Offering may be
used to acquire other  companies, technologies or  products that complement  the
business  of the  Company, although  no such  transactions are  being planned or
negotiated as of the date hereof. Pending such application, the Company  intends
to  invest such  net proceeds  in short-term,  interest-bearing investment grade
securities.
 
                                       14
<PAGE>
                          PRICE RANGE OF COMMON STOCK
 
   
    The Company  completed its  initial public  offering on  May 26,  1994.  The
Company's  Common Stock is quoted on the Nasdaq National Market under the symbol
"NPSP." On May 2, 1996,  the last reported sale  price for the Company's  Common
Stock  on the Nasdaq National  Market was $16.00 per  share. The following table
sets forth the  quarterly high and  low closing sales  prices for the  Company's
Common Stock.
    
 
   
<TABLE>
<CAPTION>
                                                                         HIGH        LOW
                                                                       ---------  ---------
<S>                                                                    <C>        <C>
1994
  Second Quarter (from May 26, 1994)                                   $    6.25  $    4.38
  Third Quarter                                                             5.25       3.75
  Fourth Quarter                                                            4.25       3.00
 
1995
  First Quarter                                                        $    4.25  $    3.25
  Second Quarter                                                            5.00       2.88
  Third Quarter                                                             8.75       4.50
  Fourth Quarter                                                           18.50       6.13
 
1996
  First Quarter                                                        $   17.25  $   12.50
  Second Quarter (through May 2, 1996)                                     16.63      11.75
</TABLE>
    
 
   
    On  March 31, 1996,  there were approximately  160 holders of  record of the
Company's Common Stock.
    
 
                                DIVIDEND POLICY
 
    The Company has never declared or  paid dividends on its capital stock.  The
Company  currently intends to  retain any future earnings  to finance the growth
and development of  its business and  therefore does not  anticipate paying  any
cash dividends in the foreseeable future.
 
                                       15
<PAGE>
                                 CAPITALIZATION
 
   
    The   following  table  sets  forth  as   of  December  31,  1995:  (i)  the
capitalization of the  Company; (ii)  such capitalization adjusted  to give  pro
forma  effect to receipt from Amgen of a $10.0 million nonrefundable license fee
in March 1996,  net of applicable  taxes, and  the sale of  1,000,000 shares  of
Common  Stock to Amgen for $7.5 million  also received in March 1996 (the "Amgen
Investment"); and (iii)  such pro  forma capitalization as  further adjusted  to
give  effect to  the sale  of 3,000,000  shares of  Common Stock  offered by the
Company hereby and the receipt of the estimated net proceeds therefrom.
    
 
   
<TABLE>
<CAPTION>
                                                                                        DECEMBER 31, 1995
                                                                               -----------------------------------
                                                                                                        PRO FORMA
                                                                                ACTUAL     PRO FORMA   AS ADJUSTED
                                                                               ---------  -----------  -----------
                                                                                         (IN THOUSANDS)
<S>                                                                            <C>        <C>          <C>
Long-term portion of capital leases and long-term debt (1)...................  $     747   $     747    $     747
                                                                               ---------  -----------  -----------
Stockholders' equity:
  Preferred stock, $.001 par value; 5,000,000 shares authorized; no shares
   issued and outstanding....................................................     --          --           --
  Common stock, $.001 par value; 20,000,000 shares authorized; 7,072,801
   shares issued and outstanding, actual; 8,072,801 shares issued and
   outstanding, pro forma; and 11,072,801 shares issued and outstanding, pro
   forma as adjusted (2).....................................................          7           8           11
  Additional paid-in capital.................................................     28,067      35,566       77,338
  Deferred compensation......................................................       (235)       (235)        (235)
  Deficit accumulated during the development stage...........................    (20,517)    (10,677)     (10,677)
                                                                               ---------  -----------  -----------
    Net stockholders' equity.................................................      7,322      24,662       66,437
                                                                               ---------  -----------  -----------
      Total capitalization...................................................  $   8,069   $  25,409    $  67,184
                                                                               ---------  -----------  -----------
                                                                               ---------  -----------  -----------
</TABLE>
    
 
- - --------------
(1) See Notes 4 and 5 of Notes to Financial Statements for a description of  the
    Company's lease commitments and long-term debt obligations.
 
(2) Excludes:  (i) 1,530,924 shares which were subject to outstanding options as
    of December 31,  1995, at exercise  prices ranging from  $0.34 to $8.25  per
    share,  with a weighted average exercise price  of $3.16 per share, and (ii)
    52,792 shares issuable upon exercise of warrants outstanding as of  December
    31,  1995, with a  weighted average exercise  price of $4.07  per share. See
    "Management -- Directors'  Compensation," "-- 1987  Stock Option Plan,"  "--
    1994  Equity Incentive Plan," "Description of  Capital Stock -- Warrant" and
    Note 6 of Notes to Financial Statements.
 
                                       16
<PAGE>
                                    DILUTION
 
   
    The pro forma net tangible  book value of the  Company at December 31,  1995
was  $24.7 million, or  $3.06 per share.  Pro forma net  tangible book value per
share is equal  to the  Company's net tangible  assets (tangible  assets of  the
Company  less total liabilities) divided by the number of shares of Common Stock
outstanding on a pro forma basis,  after giving effect to the Amgen  Investment.
Without  taking into account  any other changes  in pro forma  net tangible book
value after December  31, 1995  other than  to give effect  to the  sale of  the
3,000,000  shares of Common Stock by the Company in the Offering and the receipt
of the estimated net proceeds therefrom,  the pro forma net tangible book  value
of  the Company as of December 31, 1995  would have been $66.4 million, or $6.00
per share. This represents an immediate increase in pro forma net tangible  book
value  of $2.94 per share to existing  stockholders and an immediate dilution in
pro forma net  tangible book  value of  $9.00 per  share to  new investors.  The
following  table  sets forth  the per  share  dilution to  new investors  in the
Offering:
    
 
   
<TABLE>
<S>                                                                    <C>          <C>
Offering price per share.............................................               $   15.00
  Pro forma net tangible book value per share as of December 31,
   1995..............................................................   $    3.06
  Increase per share attributable to new investors...................        2.94
                                                                            -----
Pro forma net tangible book value per share after the Offering.......                    6.00
                                                                                    ---------
Dilution per share to new investors..................................               $    9.00
                                                                                    ---------
                                                                                    ---------
</TABLE>
    
 
    The foregoing computations exclude: (i) 1,530,924 shares which were  subject
to  outstanding options as of December 31, 1995, at exercise prices ranging from
$0.34 to $8.25 per share,  with a weighted average  exercise price of $3.16  per
share,  and (ii) 52,792 shares issuable upon exercise of warrants outstanding as
of December 31, 1995, with a weighted average exercise price of $4.07 per share.
To the  extent that  such options  and  warrants are  exercised, there  will  be
further  dilution to new investors. See "Management -- Directors' Compensation,"
"-- 1987 Stock Option  Plan," "-- 1994 Equity  Incentive Plan," "Description  of
Capital Stock -- Warrant" and Note 6 of Notes to Financial Statements.
 
                                       17
<PAGE>
                            SELECTED FINANCIAL DATA
 
    The  selected financial  data presented  below for  each fiscal  year in the
five-year period ended December  31, 1995 and the  period from October 22,  1986
(inception)  through  December 31,  1995 have  been  derived from  the Company's
financial statements,  which  have  been  audited  by  KPMG  Peat  Marwick  LLP,
independent certified public accountants, and are qualified by reference to such
Financial  Statements and Notes thereto. The Company is considered a development
stage company as described in Note 1 of Notes to Financial Statements.
 
<TABLE>
<CAPTION>
                                                                                                            OCTOBER 22,
                                                                                                               1986
                                                                                                            (INCEPTION)
                                                                   YEAR ENDED DECEMBER 31,                    THROUGH
                                                    -----------------------------------------------------  DECEMBER 31,
                                                      1991       1992       1993       1994       1995         1995
                                                    ---------  ---------  ---------  ---------  ---------  -------------
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                 <C>        <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
  Revenues from research and license agreements...  $   1,885  $   1,259  $     868  $   3,861  $   9,562    $  22,316
  Operating expenses:
    Research and development......................      1,609      2,722      6,021      7,765      8,727       30,360
    General and administrative....................        754      1,283      2,004      3,122      3,975       12,789
                                                    ---------  ---------  ---------  ---------  ---------  -------------
      Total operating expenses....................      2,363      4,005      8,025     10,887     12,702       43,149
                                                    ---------  ---------  ---------  ---------  ---------  -------------
  Operating loss..................................       (478)    (2,746)    (7,157)    (7,026)    (3,140)     (20,833)
  Other income (expense), net.....................         16        139         (2)       270        322          816
                                                    ---------  ---------  ---------  ---------  ---------  -------------
  Loss before income tax expense..................       (462)    (2,607)    (7,159)    (6,756)    (2,818)     (20,017)
  Income tax expense..............................         --         --         --         --        500          500
                                                    ---------  ---------  ---------  ---------  ---------  -------------
  Net loss........................................  $    (462) $  (2,607) $  (7,159) $  (6,756) $  (3,318)   $ (20,517)
                                                    ---------  ---------  ---------  ---------  ---------  -------------
                                                    ---------  ---------  ---------  ---------  ---------  -------------
  Net loss per share (1)..........................  $    (.33) $    (.95) $   (1.91) $   (1.13) $    (.48)
                                                    ---------  ---------  ---------  ---------  ---------
                                                    ---------  ---------  ---------  ---------  ---------
  Weighted average shares outstanding (1).........      1,386      2,746      3,751      5,977      6,924
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                         DECEMBER 31,
                                                                     -----------------------------------------------------
                                                                       1991       1992       1993       1994       1995
                                                                     ---------  ---------  ---------  ---------  ---------
                                                                                        (IN THOUSANDS)
<S>                                                                  <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
  Cash, cash equivalents and marketable investment securities......  $     119  $   6,779  $   6,414  $   9,323  $   8,340
  Working capital..................................................        (27)     6,363      5,839      8,104      5,832
  Total assets.....................................................        544      8,101     12,599     12,084     10,600
  Long-term portion of capital leases and long-term debt...........         37        473        830        440        747
  Deficit accumulated during development stage.....................       (677)    (3,284)   (10,443)   (17,199)   (20,517)
  Stockholders' equity.............................................        354      7,081      7,011     10,165      7,322
</TABLE>
 
- - ------------------
(1) See Note 1 of Notes to  Financial Statements for information concerning  the
    computation of net loss per share.
 
                                       18
<PAGE>
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
    The  following  discussion  of  the  results  of  operations  and  financial
condition of NPS should be read in conjunction with the Financial Statements and
Notes thereto included elsewhere in this Prospectus.
 
OVERVIEW
 
    Since its  inception in  1986,  NPS has  devoted  substantially all  of  its
resources to its research and development programs. To date, the Company has not
developed  any  pharmaceutical products  for sale  and has  incurred substantial
losses. NPS has incurred  cumulative losses through December  31, 1995 of  $20.5
million,  net  of cumulative  revenues from  collaborative research  and license
agreements of $22.3 million. The Company expects to incur significant  operating
losses over at least the next several years as the Company continues and expands
its  research and development  and preclinical and  clinical testing activities.
Because substantially all  of the  Company's revenues are  derived from  license
fees, milestone payments and research support payments from its Licensees, which
fluctuate  from  quarter  to  quarter,  the  Company  expects  that  losses will
fluctuate from quarter to quarter and that such fluctuations may be substantial.
The Company's ability to achieve profitability  depends in part on its  ability,
alone  and/or with  others, to complete  development of  its product candidates,
including Norcalcin, to obtain required regulatory approvals and to  manufacture
and market such products, of which there can be no assurance.
 
   
RECENT FINANCIAL RESULTS
    
 
   
    The  Company's revenues and net income for  the three months ended March 31,
1996 were $14.5 million and $9.8 million, respectively, compared to revenues  of
$924,000  and a net loss  of $1.7 million, for the  three months ended March 31,
1995. The increase in revenues and net income is primarily due to the receipt by
NPS of  a  $10 million  non-refundable  license  fee from  Amgen  following  the
execution  and  closing  of a  definitive  agreement  for Amgen  to  develop and
commercialize  NPS's  Norcalcin  and  other  compounds  for  the  treatment   of
hyperparathyroidism. Revenues and net income also increased in the first quarter
of  1996 due to the receipt  by the Company of a  $3.0 million payment under the
terms of the SmithKline Agreement. While  the Company experienced net income  in
the  quarter due  to the  non-recurring license  fee and  milestone payment, the
Company expects to  incur significant operating  losses over at  least the  next
several  years as it continues to expand its research and development activities
and preclinical and clinical activities.
    
 
RESULTS OF OPERATIONS
 
  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
    Substantially all of the Company's revenues were derived from  collaborative
research   and  license  agreements  with  the  Licensees.  Revenues  from  such
agreements were $600,000  in 1993,  $3.6 million in  1994, and  $9.4 million  in
1995.  All of the revenues in  1993 and 1994 and $1.8  million in 1995 were from
license fees received under the collaborative agreement with SmithKline  Beecham
and  recognized for  accounting purposes as  the related  research expenses were
incurred. In 1995, the  Company received and recognized  a $5.0 million  license
fee  and  $1.0 million  in  research support  from  Kirin, and  $1.6  million in
research support from SmithKline Beecham.
 
    Research and development  expenses increased  from $6.0 million  in 1993  to
$7.8  million in 1994 and to $8.7 million in 1995. The increases in research and
development expenses were principally due  to the conducting of clinical  trials
for  Norcalcin in  1994 and  1995, increased activity  in each  of the Company's
principal  research  and  development  projects,  the  associated  expansion  in
staffing and increased
 
                                       19
<PAGE>
purchases   of  laboratory  supplies  and   consulting  services.  Research  and
development expenses are expected to increase significantly in the future as NPS
conducts clinical trials for other product  candidates and as more research  and
development personnel are hired.
 
    General  and administrative expenses increased from  $2.0 million in 1993 to
$3.1 million in  1994 and  to $4.0  million in 1995.  The increase  in 1995  was
primarily  due to  costs incurred for  advisory services in  connection with the
consummation of  the  Amgen  and  Kirin  agreements,  and  the  increased  costs
associated with operating a public company for a full year. The increase in 1994
was  primarily due  to expansion of  facilities, the addition  of management and
administrative personnel,  and  the  costs associated  with  becoming  a  public
company.  The  Company expects  that  general and  administrative  expenses will
continue to increase  in the future  as a  result of increased  activity by  the
Company  in corporate development, investor relations, and legal affairs, and as
more personnel and  facilities are  needed to support  research and  development
activities.
 
    Interest  income increased from $110,000 in 1993  to $398,000 in 1994 and to
$480,000 in 1995 as a  result of increases in  the Company's cash balances  from
the  net proceeds of the  initial public offering in  1994 and the Kirin license
fee in 1995. The Company anticipates that interest income will fluctuate in  the
future as the Company's cash balance and short-term interest rates fluctuate.
 
    Interest  expense increased from $112,000 in 1993 to $128,000 in 1994 and to
$158,000 in 1995, primarily due to the acquisition of equipment through  capital
leases and completion of a $1.0 million debt financing of existing equipment and
leasehold improvements in 1995.
 
    Income  tax expense of $500,000 in 1995 consisted entirely of a 10% Japanese
tax withheld on  the license fee  paid by Kirin.  Future license, milestone  and
royalty payments from Kirin will be subject to the same 10% tax.
 
    As  of December 31, 1995, the Company had a federal income tax net operating
loss carryforward  of  approximately $18.4  million  and a  federal  income  tax
research credit carryforward of approximately $953,000. The Company's ability to
utilize  these operating loss  and research credit  carryforwards against future
taxable income will be subject to annual limitations in future periods  pursuant
to  the "change in  ownership rules" under  Section 382 of  the Internal Revenue
Code of 1986, as amended. See Note 7 of Notes to Financial Statements.
 
    The Company has adopted Financial  Accounting Standards Board Statement  No.
115,  "Accounting for  Certain Investments in  Debt and  Equity Securities." The
adoption of  the statement  did not  have  a material  effect on  the  Company's
financial statements.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The  Company has financed  its operations since  inception primarily through
collaborative research  and  license  agreements  and  the  private  and  public
placement  of  equity  securities. As  of  December  31, 1995,  the  Company had
recognized approximately $22.3 million of cumulative revenues from collaborative
research and license agreements and approximately $28.1 million in consideration
for the sale of equity securities. The Company's principal sources of  liquidity
are  its  cash,  cash  equivalents and  marketable  investment  securities which
totaled $8.3  million  at  December  31, 1995.  Also,  in  connection  with  the
establishment  of  the  Amgen agreement,  Amgen  paid  $7.5 million  to  NPS for
1,000,000 shares  of Common  Stock and  a non-refundable  license fee  of  $10.0
million in March 1996.
 
    The  Company  receives quarterly  payments  under the  Kirin  and SmithKline
Beecham agreements  to  support  the  Company's  research  efforts  in  HPT  and
osteoporosis,  respectively. The Kirin payments are $500,000 per quarter through
June 1996 and  a total  of $5.0  million over the  remaining four  years of  the
research term of the agreement. The SmithKline Beecham payments are estimated to
be  an  aggregate  of  $4.3  million through  the  scheduled  expiration  of the
agreement in October 1996, of which  $1.6 million had been received by  December
31,  1995. Amgen will reimburse the Company up to $400,000 per year for a period
not to exceed five years for certain costs which may be incurred by the  Company
in the
 
                                       20
<PAGE>
development  of  Norcalcin  in  the  Amgen  territory,  with  such participation
occuring under  the direction  of Amgen.  The Company  could receive  additional
payments  of up to $56.0  million from the Licensees  upon the accomplishment of
specified research and/or development milestones.  Each of these agreements  may
be  terminated before the  scheduled expiration date  by the respective Licensee
and, therefore, no assurance can be given that any future milestone or  research
or development support payments will be received thereunder.
 
    Under  its agreement with  the Brigham and  Women's Hospital, Inc. ("Brigham
and Women's"),  the Company  is obligated  to pay  an aggregate  of $810,000  to
Brigham  and  Women's  from  February  1996  through  February  1998. Additional
payments may be required upon the accomplishment of certain research  milestones
by Brigham and Women's.
 
    As  of  December  31,  1995,  the  Company's  net  investment  in  leasehold
improvements, equipment  and furnishings  was  approximately $2.2  million.  The
Company  has financed a portion of  such expenditures through capital leases and
long-term debt with a total  principal obligation of approximately $1.5  million
as  of December 31, 1995. Additional equipment  and facilities will be needed as
the Company  increases its  research and  development activities,  a portion  of
which may be financed with debt. Equipment and leasehold improvements subject to
the  capital leases and the  long-term debt have been  pledged in support of the
leasehold obligations.
 
    The Company  anticipates  that  its existing  capital  resources,  including
research  and development support payments from existing collaborations, as well
as the net proceeds  of the Offering  and the interest  earned thereon, will  be
sufficient  to enable it to maintain  its current and planned operations through
at least  1997.  However,  actual  needs  are  dependent  on  numerous  factors,
including  the progress of the Company's  research and development programs, the
magnitude and scope of these activities, progress with preclinical and  clinical
trials,  the cost of  preparing, filing, prosecuting,  maintaining and enforcing
patent claims and  other intellectual property  rights, competing  technological
and  market developments, changes  in or terminations  of existing collaborative
research or license arrangements, the establishment of additional  collaborative
arrangements and the cost of manufacturing scale-up and development of marketing
activities,  if  undertaken by  the  Company. Substantial  expenditures  will be
required to conduct preclinical studies and clinical trials, manufacture or have
manufactured and market products other than Norcalcin from current research  and
development   efforts  and  perform  research   and  development  activities  in
additional areas. In addition, if Amgen terminates its agreement to develop  and
commercialize  Norcalcin in its  territory, the Company  may not have sufficient
capital to  complete  the  development and  commercialization  of  Norcalcin  in
Amgen's territory.
 
    NPS will need to raise substantial additional funds to support its long-term
product  development and commercialization programs. The Company also intends to
seek  additional  funding   through  corporate   collaborations  and   licensing
agreements and the Company may seek additional funding through public or private
financing. There can be no assurance that additional financing will be available
on acceptable terms, if at all. If adequate funds are not available, the Company
may  be required to delay, reduce  the scope of or eliminate  one or more of its
research and development programs or  to obtain funds through arrangements  with
collaborative  partners or  others that  may require  the Company  to relinquish
rights to certain of its technologies,  product candidates or products that  the
Company may otherwise seek to develop or commercialize on its own.
 
                                       21
<PAGE>
                                    BUSINESS
 
GENERAL
 
    NPS  Pharmaceuticals is engaged  in the discovery  and development of orally
active, small  molecule  drugs  that  target  cell  surface  receptors  and  ion
channels.  The Company's most advanced  product candidate, Norcalcin-TM- for the
treatment of hyperparathyroidism  ("HPT"), arose from  the Company's  pioneering
work  on  a  new  class  of  cell  surface  receptors  which  detect  levels  of
extracellular calcium  involved  in  numerous bodily  functions.  To  date,  the
Company  has  conducted  two Phase  I  and  two Phase  I/II  clinical  trials of
Norcalcin to test its safety and initial efficacy. The Company is also  applying
its   calcium  receptor   technology  to   the  development   of  therapies  for
osteoporosis. The  Company's  other main  programs  involve the  development  of
orally  active, small molecule  drugs which have  neuroprotectant properties and
target certain calcium channels in order to provide treatments for stroke,  head
trauma, chronic pain and epilepsy. Additionally, the Company is pursuing several
discovery  programs which are extensions of its discoveries in calcium receptors
and ion channels.
 
    NPS has established  research collaborations and  license arrangements  with
the  pharmaceutical  division of  Kirin Brewery  Company, Limited  ("Kirin") and
SmithKline Beecham Corporation ("SmithKline Beecham")  in the fields of HPT  and
osteoporosis, respectively, and has established a license arrangement with Amgen
Inc.  ("Amgen") in  the field  of HPT. Kirin,  SmithKline Beecham  and Amgen are
referred to herein  as the "Licensees."  The Licensees are  responsible for  all
costs of product development in their respective territories and fields. As part
of  these arrangements,  the Licensees  have paid to  NPS an  aggregate of $21.0
million in non-refundable license fees and Amgen and an affiliate of  SmithKline
Beecham have purchased $14.5 million of the Company's Common Stock. In addition,
the  Licensees have agreed to make up to $56.0 million in milestone payments, of
which $3.0 million has  been paid to  the Company to  date under the  SmithKline
Beecham  agreement. SmithKline  Beecham and Kirin  are also obligated  to pay an
aggregate of approximately $11.3 million  in research support payments. Each  of
the  Licensees is obligated  to pay royalties  to NPS on  any product sales. See
"Risk Factors -- Dependence on Collaborative Research and License Relationships"
and "Business -- Collaborative Research and License Agreements."
 
    HPT is a  growing medical concern  and is typically  characterized as  being
either primary or secondary. Primary HPT is an age-related disorder that results
from  excessive secretion  of parathyroid  hormone ("PTH"),  leading to elevated
levels of calcium in the blood. Symptoms may include bone loss, muscle weakness,
depression and  cognitive dysfunction.  Approximately 100,000  new patients  are
diagnosed  with primary HPT in the United  States each year. There are currently
no pharmaceutical therapies for the treatment of primary HPT, with surgery being
the only effective treatment.  Secondary HPT results  from other disease  states
and  is most often associated with  renal dysfunction. Symptoms of secondary HPT
include excessive  bone loss,  bone pain,  and chronic,  severe itching.  It  is
estimated  that approximately 80% of the patients  in the United States who rely
on kidney dialysis, or approximately  140,000 patients, suffer from the  effects
of  secondary HPT. The Company believes that current drug therapy treatments for
secondary  HPT,  such   as  phosphate  binders   and  calcitriol  have   certain
disadvantages.
 
    The Company's preliminary analysis of the data from its four clinical trials
of  Norcalcin  indicates that  Norcalcin was  safe and  well tolerated  in these
studies and  that  the  administration  of Norcalcin  resulted  in  an  expected
dose-dependent  decrease in the level of PTH in the blood. The higher doses used
in the  Phase I  studies and  in the  Phase I/II  dialysis study  resulted in  a
decrease  in the level of calcium in  the blood. The Company expects to complete
the formal  analysis  from  all  four  trials and  to  report  its  findings  in
appropriate   forums  during  the  latter  half  of  1996.  Amgen  is  currently
formalizing its clinical  strategy for the  continued development of  Norcalcin,
and  the Company believes Kirin will begin  Phase I clinical trials of Norcalcin
in Japan  in 1996.  There can  be no  assurance that  the clinical  trials  will
proceed  as  indicated or  that Norcalcin  will prove  safe and  effective, meet
applicable regulatory standards or be  successfully marketed. See "Risk  Factors
- - --  Early  Stage  of Product  Development;  Dependence  on Norcalcin"  and  " --
Dependence on Collaborative Research and License Relationships."
 
                                       22
<PAGE>
    In conjunction with  SmithKline Beecham,  NPS is also  applying its  calcium
receptor  technology to  the development of  orally active  therapeutics for the
treatment of  osteoporosis. Osteoporosis  is an  age-related disorder  affecting
more  than 200  million people  worldwide and  is characterized  by reduced bone
density and  an increased  susceptibility  to fractures.  Among the  elderly  in
particular,  osteoporosis  is  a major  cause  of morbidity  and  mortality. The
Company  is  pursuing  two  approaches   for  the  treatment  of   osteoporosis,
stimulation   of  bone  formation  and  suppression  of  bone  resorption.  Most
osteoporosis patients  are first  diagnosed only  after they  have already  lost
significant bone mass. As a result, the Company believes that a therapy that not
only  halts further  bone loss,  but also  builds new  bone, would  constitute a
significant  advancement   in  the   treatment   of  osteoporosis.   Under   its
collaboration  with SmithKline Beecham, research  efforts are being conducted by
NPS concurrently  on  both approaches  to  osteoporosis. In  January  1996,  the
Company received a milestone payment of $3.0 million from SmithKline Beecham for
progress made in its osteoporosis program.
 
    The  Company  is developing  a new  class of  orally active  compounds which
modulate certain calcium channels for neuroprotection in stroke and head  trauma
and  also for chronic pain and epilepsy. The influx of calcium through glutamate
receptor-operated calcium channels has been  linked to a number of  neurological
disorders, including nerve cell death following stroke and head trauma, and also
to  certain  types  of  chronic pain  and  epilepsy.  The  Company's proprietary
compounds  antagonize  the  NMDA  (N-methyl-D-aspartate)  subtype  of  glutamate
receptor-operated  calcium channels ("NMDA receptor-channels"), thereby reducing
the influx of calcium. The Company believes that these compounds work through  a
novel mechanism and exhibit potentially advantageous pharmacological properties.
These  compounds  demonstrated  neuroprotectant activity  in  preclinical animal
models of stroke  and head trauma  and palliative activity  in animal models  of
chronic  pain and epilepsy.  The Company has designated  one of these compounds,
NPS 1506, for preclinical development on a time line which currently anticipates
an Investigational New Drug ("IND") filing with the United States Food and  Drug
Administration  ("FDA") in  the first  half of  1997. However,  there can  be no
assurance that the IND will be filed in this time frame.
 
    The Company is actively engaged in several discovery programs which seek  to
identify  molecular targets for  the development of new  drugs. Among these, the
Company believes it has made significant discoveries with regard to metabotropic
glutamate receptors  ("mGluRs"), having  identified  small molecules  active  at
these  receptors. The Company believes that  drugs acting at specific mGluRs may
provide relevant therapies for a number of neurological disorders.
 
STRATEGY
 
    The Company's  strategy  is  to utilize  its  proprietary  technologies  and
expertise   in  cell  surface   receptors  and  ion   channels  to  develop  and
commercialize small molecule therapeutics. Currently, the Company is focused  on
product  development programs for  HPT, osteoporosis, stroke,  head trauma, pain
and epilepsy. Key elements of the Company's strategy include the following:
 
    -THROUGH AMGEN AND KIRIN, CONFIRM SAFETY AND ESTABLISH CLINICAL EFFICACY AND
     COMMERCIALIZATION OF NORCALCIN FOR  THE TREATMENT OF  HPT. The Company  has
     granted  Amgen an exclusive  license to complete the  development of and to
     manufacture and  commercialize  Norcalcin  and  certain  related  compounds
     worldwide,  excluding  the territories  covered by  the Kirin  license. The
     Company has granted a similar license  to Kirin in Japan, China, Korea  and
     Taiwan.  Amgen  is  currently  formalizing its  clinical  strategy  for the
     continued development of  Norcalcin, and  the Company  believes that  Kirin
     will begin Phase I clinical trials in Japan in 1996.
 
                                       23
<PAGE>
    -IDENTIFY  CLINICAL CANDIDATES FOR THE TREATMENT OF OSTEOPOROSIS AND ADVANCE
     ONE OR MORE  LEAD COMPOUNDS INTO  CLINICAL TRIALS IN  CONJUNCTION WITH  ITS
     COLLABORATOR,  SMITHKLINE BEECHAM. In  conjunction with SmithKline Beecham,
     the Company is pursuing two  approaches for the treatment of  osteoporosis,
     stimulation  of  bone  formation  and suppression  of  bone  resorption. In
     January 1996, the Company received a $3.0 million milestone from SmithKline
     Beecham as part of its collaboration.
 
    -INITIATE CLINICAL TRIALS OF NPS 1506 FOR NEUROPROTECTION. NPS is developing
     a new class of proprietary small molecule NMDA receptor-channel antagonists
     which the Company  believes may  be effective neuroprotectants  as well  as
     effective   in  the  treatment  of  chronic  pain  and  epilepsy.  NPS  has
     demonstrated neuroprotectant activity with  these compounds in  preclinical
     animal  models of stroke and head trauma, and palliative activity in animal
     models of chronic pain and epilepsy. The Company has identified NPS 1506 as
     a lead compound for neuroprotection and estimates that it will file an  IND
     for NPS 1506 in the first half of 1997.
 
    -CONTINUE  DISCOVERY  AND  DEVELOPMENT ACTIVITIES  TO  EXPAND  THE COMPANY'S
     PRODUCT PIPELINE.  The Company  is actively  engaged in  several  discovery
     programs  which seek to identify new  molecular targets for the development
     of new drugs.  Among these, the  Company believes it  has made  significant
     discoveries with regard to mGluRs, which may lead to relevant therapies for
     a number of neurological disorders.
 
    -ESTABLISH  COLLABORATIONS  WHICH  PROVIDE ENHANCED  OPPORTUNITIES  FOR DRUG
     DEVELOPMENT AND COMMERCIALIZATION. The Company generally has conducted  the
     development  of  its product  candidates at  least through  the preclinical
     research phase  and  has used  collaborations  to supplement  its  internal
     research,  preclinical and clinical development  resources. The Company has
     established alliances  with pharmaceutical  companies to  conduct  clinical
     trials,  prepare regulatory submissions  and market and  sell the Company's
     products in exchange for license fees, milestone payments, research support
     payments and royalties. Under future collaborations, the Company expects to
     retain strategically  important  development,  manufacturing  or  marketing
     rights in order to enhance the value of its drug development opportunities.
 
PRODUCT DEVELOPMENT PROGRAMS
 
    The  Company  is currently  developing orally  active compounds  that target
calcium receptors as  drug therapies for  HPT and osteoporosis.  The Company  is
also  developing orally active  compounds that target  NMDA receptor-channels as
neuroprotectants to reduce neurological damage  associated with stroke and  head
trauma and additionally for the treatment of chronic pain and epilepsy.
 
    Calcium  levels in the blood are tightly regulated, and a modest increase or
decrease in circulating calcium can  be life-threatening. Calcium receptors  are
the  basis of  a newly  discovered mechanism by  which certain  cells detect and
respond to  small changes  in extracellular  calcium. One  key role  of  calcium
receptors  is to regulate circulating levels of PTH and calcitonin, two hormones
which play opposing roles in bone  and mineral metabolism. The Company  believes
that  manipulation  of PTH  and  calcitonin levels  could  be beneficial  in the
treatment of  various  bone  and  mineral-related disorders,  such  as  HPT  and
osteporosis.  The  Company  has  utilized its  expertise  in  certain functional
screening technologies and  its proprietary recombinant  cell lines to  discover
and  develop orally active compounds  which are novel in  that they can directly
manipulate the levels  of PTH  and calcitonin  by modulating  the activities  of
calcium  receptors.  Compounds  which mimic  the  effect of  calcium  at calcium
receptors are referred to as "calcimimetics" (agonists) while those which  block
the effect of calcium are referred to as "calcilytics" (antagonists).
 
    NMDA   receptor-channels   play   critical   roles   in   normal  excitatory
neurotransmission and are also recognized for  their major role in events  which
lead  to much of the neurological damage associated with stroke and head trauma.
Several  pharmaceutical  companies  have   recognized  the  potential  of   NMDA
receptor-channels  as molecular  targets for the  development of  drugs to treat
neurological disorders and
 
                                       24
<PAGE>
have identified various  lead compounds.  Unfortunately, NMDA  receptor-channels
are  also the site of action of  phencyclidine ("PCP"), and most compounds which
target NMDA receptor-channels exhibit undesirable PCP-like side effects such  as
inducing  symptoms  of  psychosis. The  Company  has utilized  its  expertise in
certain functional screening technologies to discover and develop orally  active
compounds  which antagonize NMDA  receptor-channels by binding  to a novel site,
distinct from the PCP binding site.  The Company's compounds have not  exhibited
PCP-like  effects  in a  variety  of IN  VITRO and  IN  VIVO studies  in animals
intended to identify PCP-like effects.
 
    The following chart summarizes the Company's product development programs:
 
<TABLE>
<CAPTION>
DEVELOPMENT PROGRAM     MOLECULAR TARGET      COMPOUND/STATUS      COMMERCIAL RIGHTS
- - --------------------  --------------------  --------------------  --------------------
HYPERPARATHYROIDISM
<S>                   <C>                   <C>                   <C>
  Primary HPT         Parathyroid           Norcalcin-TM-/Phase   Amgen, Kirin
                      calcium receptor      I/II(1)
  Secondary HPT       Parathyroid           Norcalcin-TM-/Phase   Amgen, Kirin
                      calcium receptor      I/II(1)
OSTEOPOROSIS
  Stimulation of      Parathyroid           Preclinical           SmithKline
   bone formation     calcium receptor      Research(2)           Beecham(4)
  Suppression of      C-cell and            Preclinical           SmithKline
   bone resorption    osteoclast calcium    Research(2)           Beecham(4)
                      receptors
 
NEUROPROTECTION
  Stroke, Head        NMDA                  NPS 1506/Preclinical  NPS
   Trauma             receptor-channel
                                            Development(3)
CHRONIC PAIN          NMDA                  Preclinical           NPS
                      receptor-channel      Research(2)
EPILEPSY              NMDA                  Preclinical           NPS
                      receptor-channel      Research(2)
- - ------------------
 
(1)   See "Business  --  Hyperparathyroidism Program  --  Norcalcin-TM- --  Status  of
     Clinical Trials."
 
(2)    "Preclinical Research"  refers to  one or  more active  compounds or  series of
     related active  compounds  which  have met  predetermined  activity  criteria  in
     various  IN VITRO and/or  IN VIVO models.  More extensive evaluation  of the lead
     compounds is undertaken  to determine if  they have the  requisite properties  to
     enter preclinical development.
 
(3)   "Preclinical Development" refers  to ongoing research in  the areas of efficacy,
     pharmacology and  toxicology studies  in animal  models necessary  to support  an
     application to the FDA to commence human clinical testing.
 
(4)    NPS has  certain co-promotion  rights in  the United  States. See  "Business --
     Collaborative Research and License Agreements -- SmithKline Beecham Corporation."
</TABLE>
 
  HYPERPARATHYROIDISM PROGRAM -- NORCALCIN-TM-
 
    OVERVIEW.  HPT is a growing  medical concern and is typically  characterized
as  being either  primary or secondary.  Primary HPT is  an age-related disorder
that results  from  excessive  secretion  of  parathyroid  hormone,  leading  to
elevated  calcium levels  in the blood.  Symptoms may include  bone loss, muscle
weakness,  depression  and  cognitive  dysfunction.  Approximately  100,000  new
patients  are diagnosed with primary  HPT in the United  States each year. There
are currently no pharmaceutical therapies for the treatment of primary HPT, with
surgery to remove the affected parathyroid  gland(s) from the neck region  being
the only effective treatment.
 
    Secondary HPT results from other disease states and is most often associated
with  renal dysfunction. Symptoms of secondary  HPT include excessive bone loss,
bone pain, and chronic, severe itching.  It is estimated that approximately  80%
of  the  patients  in  the  United  States  who  rely  on  kidney  dialysis,  or
approximately 140,000 patients,  suffer the  effects of  secondary HPT.  Studies
have  also shown  that there is  a correlation between  kidney dysfunction among
patients not on dialysis and elevated PTH levels in the blood. Accordingly,  the
Company  believes that  some of  these patients  may also  suffer from secondary
 
                                       25
<PAGE>
HPT. Current treatments for  secondary HPT involve  drug therapy with  phosphate
binders  and/or  calcitriol.  The  Company believes  that  these  therapies have
certain disadvantages. For example, phosphate binders are not well tolerated  by
many  people, and calcitriol often  leads to hypercalcemia and hyperphosphatemia
which can exacerbate  the underlying disease.  In severe cases,  surgery may  be
required to remove all or part of the parathyroid glands.
 
    Based  on  its research  and preclinical  and clinical  trials to  date, the
Company believes that  Norcalcin could prove  to be effective  in treating  both
types  of HPT. PTH secretion is normally regulated by changes in the circulating
level of calcium. The  parathyroid glands secrete  PTH which triggers  metabolic
changes  in  bone and  the kidney  that  increase calcium  levels in  the blood.
Increased levels of  circulating calcium activate  the parathyroid cell  calcium
receptor,  which  then suppresses  the secretion  of PTH.  In HPT,  however, PTH
levels  remain  elevated.  Norcalcin  is  a  calcimimetic  (a  calcium  receptor
agonist),  which  mimics  the  action  of calcium  at  the  calcium  receptor on
parathyroid cells,  thereby  reducing the  secretion  of PTH.  The  Company  has
entered  into agreements  with Amgen and  Kirin relating to  the development and
commercialization of  Norcalcin. See  "Business  -- Collaborative  Research  and
License Agreements."
 
                                [DIAGRAM]
 
<TABLE>
<S>                                            <C>
IN  HPT,  EXCESS  PTH  TRIGGERS  PATHOLOGICAL  CALCIMIMETIC  DRUGS,   SUCH   AS   NORCALCIN,
CHANGES  IN BONE  AND IN  THE KIDNEY, THEREBY  ACTIVATE   CALCIUM   RECEPTORS   LEADING   TO
INCREASING THE LEVEL OF CALCIUM IN THE BLOOD.  SUPPRESSION  OF  PTH  SECRETION.  IN PATIENTS
                                               WITH HPT, CALCIMIMETIC DRUGS ARE EXPECTED  TO
                                               AMELIORATE  SYMPTOMS CAUSED BY EXCESS PTH AND
                                               HIGH CALCIUM LEVELS.
</TABLE>
 
    The Company's studies in  animals have shown that  Norcalcin offers a  novel
and  direct means of regulating PTH secretion.  In animal tests conducted by the
Company, orally administered Norcalcin  reduced circulating levels  of PTH in  a
dose-dependent  manner. This reduction  of PTH further  resulted in decreases in
levels of  calcium  in  the  blood.  The Company  has  also  completed,  and  is
continuing  to analyze the data from,  a six-month toxicology study of Norcalcin
in rats and a 12-month toxicology study in dogs.
 
                                       26
<PAGE>
    STATUS OF  CLINICAL  TRIALS.    The chart  below  summarizes  the  Company's
Norcalcin clinical trials conducted to date:
 
<TABLE>
<CAPTION>
                                                        PRELIMINARY
                                                        ANALYSIS OF
                                                          RESULTS         NUMBER OF
 CLINICAL TRIAL       PROTOCOL         DAILY DOSE        ANNOUNCED         SUBJECTS
- - ----------------  ----------------  ----------------  ---------------  ----------------
Phase I           Placebo-controlled, 10-400          June 1994        18 healthy,
(single-site)     double blinded,   milligrams                         post- menopausal
                  single dose,                                         women over the
                  dose escalation                                      age of 40
<S>               <C>               <C>               <C>              <C>
Phase I           Placebo-controlled, 20-400          January 1996     48 healthy men
(single-site)     double blinded,   milligrams                         and women over
                  multiple dose,                                       the age of 40
                  dose escalation
PhaseI/II         Placebo-controlled, 4-160 milligrams January 1996    20 women with
(multi-site)      double blinded,                                      mild, primary
                  single dose,                                         HPT
                  dose escalation
Phase I/II        Open label,       40-200            April 1996       8 male dialysis
(single-site)     single dose,      milligrams                         patients with
                  dose escalation,                                     secondary HPT
                  on and off
                  dialysis
</TABLE>
 
    Since  filing  its  IND for  Norcalcin  in  December 1993,  the  Company has
conducted four clinical trials  of Norcalcin. As indicated  in the table  above,
these include two Phase I safety and tolerance studies, a multi-site, Phase I/II
study  in women with mild, primary HPT and a Phase I/II study in kidney dialysis
patients with secondary HPT. The Company's preliminary analysis of the data from
these studies indicates  that Norcalcin  was safe  and well  tolerated in  these
studies  and  that  the  administration of  Norcalcin  resulted  in  an expected
dose-dependent decrease in the level of PTH in the blood. The higher doses  used
in  the Phase  I studies  and in  the Phase  I/II dialysis  study resulted  in a
decrease in the level of  calcium in the blood.  The observed adverse events  in
these  trials  were  consistent with  the  underlying diseases  and  the Company
believes that the  adverse events are  unrelated to Norcalcin.  Blood and  urine
samples  collected from  each of  the four  clinical trials  are currently being
analyzed in a pharmacokinetic study. The Company expects to complete the  formal
analysis  of  the  data from  all  four trials  and  to report  its  findings in
appropriate  forums  during  the  latter  half  of  1996.  Amgen  is   currently
formalizing  its clinical strategy  for continued development  of Norcalcin, and
the Company believes Kirin will begin Phase I clinical trials in Japan in  1996.
There can be no assurance that clinical trials will proceed as indicated or that
Norcalcin will prove safe and effective, meet applicable regulatory standards or
be   successfully  marketed.  See  "Risk  Factors  --  Early  Stage  of  Product
Development; Dependence  on  Norcalcin"  and  "--  Dependence  on  Collaborative
Research and License Relationships."
 
  OSTEOPOROSIS PROGRAM
 
    OVERVIEW.   Osteoporosis is an age-related  disorder which affects more than
200 million people worldwide and is characterized by reduced bone density and an
increased  susceptibility  to  fractures.  Osteoporosis  is  a  major  cause  of
morbidity and mortality among the elderly. It has been estimated that the United
States  market for osteoporosis treatments  will more than triple  by the end of
the decade.
 
    Throughout life,  bone  undergoes  constant  remodeling  involving  anabolic
processes  leading to  bone formation  and catabolic  processes leading  to bone
resorption. The balance between these two processes determines whether there  is
net  bone  loss, net  bone formation  or  no net  change. In  osteoporosis, this
balance has shifted in favor of bone resorption, resulting in net bone loss.
 
                                       27
<PAGE>
    Current drugs approved for the  treatment of osteoporosis include  estrogen,
injectable  calcitonin,  and  alendronate (a  bisphosphonate).  These  drugs are
anti-resorptives and act to suppress bone resorption. The Company believes  that
each  of these therapies presents one or more disadvantages. For example, use of
estrogen is believed  to be  associated with  increased risk  of breast  cancer,
calcitonin  is  expensive  and  cannot  currently  be  administered  orally  and
bisphosphonates have been associated with side effects such as  gastrointestinal
distress.  Moreover,  long-term studies  on  bisphosphonates have  not  yet been
performed. In contrast, anabolic agents  stimulate new bone formation. While  no
anabolic  agents are currently available for  the treatment of osteoporosis, the
FDA's  Endocrinologic  and  Metabolic  Drugs  Advisory  Committee  has  recently
recommended  that slow-release fluoride, an anabolic  agent, be approved for the
treatment of  osteoporosis  in  post-menopausal patients  who  have  suffered  a
fracture.
 
    Most  osteoporosis patients are first diagnosed after they have already lost
significant bone mass. As a result, the Company believes that a therapy that not
only halts  further  bone loss  but  also builds  new  bone would  constitute  a
significant   advancement   in  the   treatment   of  osteoporosis.   Under  its
collaboration with SmithKline Beecham, research  efforts are being conducted  by
NPS  concurrently on both stimulation of  bone formation and suppression of bone
resorption. Both of these  approaches are focused on  the development of  orally
active molecules that are particularly suitable for long-term therapy.
 
    BONE  FORMATION.  NPS's primary approach to the treatment of osteoporosis is
currently focused on calcilytic  compounds (calcium receptor antagonists)  which
block  the action of calcium at calcium  receptors and thus are expected to have
effects opposite to those of  calcimimetic compounds. The Company believes  that
this  novel  approach,  which  is  intended to  manipulate  the  body's  own PTH
reserves,  could  provide  an  effective  anabolic  therapy  for   osteoporosis,
stimulating  new bone formation to  replace bone which has  already been lost to
the disease.
 
    While chronically high levels of PTH are known to cause bone loss as in HPT,
PTH levels fluctuate daily and this is thought to play a key role in  regulating
the normal balance between bone resorption and bone formation. Recent studies in
animals  and in  humans have shown  that frequent (usually  daily) injections of
exogenous PTH  sufficient to  cause intermittent  increases in  circulating  PTH
levels  result  in  significant  stimulation  of  new  bone  formation.  Several
published animal studies have evaluated the  structure of the newly formed  bone
and  have found that the increases in bone mass achieved with PTH injections are
accompanied by improvements in biomechanical strength and in certain indices  of
bone structure thought to be related to biomechanical strength.
 
    Although  the anabolic effects of PTH on bone were first noted over 60 years
ago, evaluation of the therapeutic potential of PTH treatment has only  recently
begun.   Because  of  its  potential  as   an  effective  anabolic  therapy  for
osteoporosis, certain other companies  are currently conducting clinical  trials
of  injectible PTH  or PTH analogs  for osteoporosis. However,  PTH is currently
expensive to manufacture and cannot be administered orally. The Company believes
that orally  administered,  calcilytic  drugs acting  on  the  parathyroid  cell
calcium  receptor to increase PTH release from the body's own PTH reserves could
provide a cost-effective means of intermittently increasing PTH levels and could
lead to greater patient compliance and therefore greater acceptance.
 
                                       28
<PAGE>
                                   [DIAGRAM]
 
     THE COMPANY IS  WORKING IN  COLLABORATION WITH  SMITHKLINE BEECHAM  TO
     DEVELOP  CALCILYTIC  DRUGS  THAT,  BY  BLOCKING  THE  PARATHYROID CELL
     CALCIUM RECEPTOR, WOULD STIMULATE LOW-LEVEL, INTERMITTENT SECRETION OF
     PARATHYROID HORMONE, THEREBY STIMULATING NEW BONE FORMATION.
 
    The Company has  demonstrated in  IN VIVO animal  studies that  intermittent
increases  in  circulating  levels of  PTH  can  be obtained  by  regulating the
activity of calcium receptors on the parathyroid cells. Increased levels of  PTH
achieved  by  this mechanism  are equivalent  to  levels of  PTH achieved  by an
injection of PTH sufficient to cause bone growth. These studies provide  support
for  the underlying premise that the  body's own internal reserves of releasable
PTH are sufficient to cause bone growth.
 
    SUPPRESSION OF  BONE  RESORPTION.    Bone  resorption  is  the  function  of
specialized  bone cells called osteoclasts.  NPS is pursuing new anti-resorptive
therapies which involve calcimimetic drugs acting either directly on osteoclasts
or indirectly  via C-cells  of the  thyroid. The  Company believes  that  orally
active  calcimimetic drugs could provide  cost-effective alternatives to current
anti-resorptive drugs and could potentially lead to greater patient compliance.
 
    When bone  is  broken  down  by the  osteoclast,  calcium  is  released  and
accumulates in very high concentrations near the osteoclast. High concentrations
of  extracellular calcium inhibit further bone resorption by the osteoclast. NPS
believes that the  effect of  extracellular calcium may  be mediated  by a  cell
surface calcium receptor on the osteoclast. NPS scientists are currently working
to  identify this receptor  and to develop  compounds that mimic  the effects of
extracellular calcium to directly suppress osteoclastic bone resorption.
 
                                   [DIAGRAM]
 
    IN RESORBING BONE, OSTEOCLASTS ATTACH TIGHTLY TO THE SURFACE OF BONE AND
    SECRETE ENZYMES AND PROTONS. THE  ENZYMES DEGRADE THE ORGANIC MATRIX  OF
    BONE  (MOSTLY COLLAGEN),  AND THE  PROTONS CREATE  AN ACIDIC ENVIRONMENT
    THAT DISSOLVES THE INORGANIC MATRIX  OF BONE. AS THE MINERALIZED  MATRIX
    IS   DISSOLVED,  CALCIUM  ACCUMULATES  TO  VERY  HIGH  LEVELS  NEAR  THE
    OSTEOCLAST.
 
                                       29
<PAGE>
    C-cells of the thyroid produce the protein hormone, calcitonin.  Osteoclasts
are  known  to possess  cell  membrane receptors  for  calcitonin which  acts to
suppress osteoclastic bone  resorption. Studies  in animals and  in humans  have
shown  that repetitive injections of calcitonin (usually daily) are effective at
inhibiting bone resorption, and injectable calcitonin is currently used in  some
countries  as a  therapy for  osteoporosis. The  Company's novel  approach is to
develop orally  active drugs  which can  be used  to manipulate  the body's  own
internal reserves of calcitonin in order to achieve a similar effect.
 
    NPS and its collaborators at Brigham and Women's have confirmed that calcium
receptors  are present on C-cells  of the thyroid and  that activation of C-cell
calcium receptors induces calcitonin secretion.  In animal studies, the  Company
has  demonstrated that oral administration  of calcimimetic compounds stimulates
secretion of calcitonin and can lead to increased circulating calcitonin levels.
Further IN VIVO studies are necessary to determine if this approach will  result
in a significant decrease in bone resorption.
 
                                   [DIAGRAM]
 
    CALCIMIMETIC  DRUGS  THAT  ACTIVATE  C-CELL  CALCIUM  RECEPTORS INCREASE
    CALCITONIN LEVELS IN THE BLOOD.  CALCITONIN ACTS DIRECTLY ON  OSTEOCLAST
    CALCITONIN  RECEPTORS TO SUPPRESS BONE RESORPTION ACTIVITY. CALCIMIMETIC
    DRUGS ACTING  ON A  DISTINCT  OSTEOCLAST CALCIUM  RECEPTOR THAT  NPS  IS
    WORKING  TO IDENTIFY  WOULD MIMIC  THE EFFECT  OF EXTRACELLULAR CALCIUM,
    DIRECTLY SUPPRESSING BONE RESORPTION ACTIVITY.
 
    PRECLINICAL RESEARCH STATUS.  NPS has  made significant progress on both  of
its  approaches to osteoporosis. In January 1996, the Company received the first
milestone payment of $3.0 million from  SmithKline Beecham for progress made  in
its  osteoporosis program. Medicinal chemistry efforts  at NPS are being applied
to various  lead compounds  with the  goal of  identifying proprietary  clinical
development  candidates. NPS has  produced a human cell  line that expresses the
parathyroid and C-cell calcium  receptors and serves as  a proprietary tool  for
the  high throughput screening of compounds to identify new drug candidates. The
Company continues to  screen SmithKline  Beecham and NPS  compound libraries  to
identify  additional compounds  with calcilytic or  calcimimetic activity. There
can be  no assurance  that  lead compounds  will  be identified  as  proprietary
clinical development candidates, that
 
                                       30
<PAGE>
preclinical  and  clinical  trials  will  proceed  as  indicated  or  that  such
candidates will prove safe and  effective, meet applicable regulatory  standards
or  be  successfully  marketed. See  "Risk  Factors  -- Early  Stage  of Product
Development; Dependence on Norcalcin."
 
  NEUROPROTECTION PROGRAM -- NPS 1506
 
    OVERVIEW.  Stroke is the third leading cause of death in the United  States,
with  over 500,000 cases reported  each year. In stroke,  a blood vessel becomes
blocked, leading to inadequate blood supply (ischemia) to the brain. While  many
stroke  victims  survive, approximately  100,000 to  150,000  per year  are left
severely and permanently disabled by nerve damage resulting from stroke. Much of
this damage occurs within  the first 24  to 48 hours after  the incident and  is
caused by the excessive release of glutamate and the resultant influx of calcium
into  nerve cells.  Published research  in animals has  shown that  much of this
damage can be prevented by blocking the influx of calcium into cells, especially
the influx which results from the activation of NMDA receptor-channels.  Calcium
influx  resulting from the activation of  NMDA receptor-channels also appears to
cause neuronal damage  associated with  head trauma.  Approximately two  million
traumatic  brain injuries occur each year in the United States, with 25% of such
injuries requiring hospitalization and about one percent resulting in death.
 
    Certain medical procedures are associated with an increased risk of  stroke.
For  example, strokes occur in three to seven percent of coronary artery bypass,
carotid endarterectomy and  heart valve  replacement surgeries.  Mild to  severe
central  nervous system dysfunction occurs in up to 80% of such procedures. This
is thought to result from multiple micro-strokes caused by the release into  the
circulation  of numerous tiny blood clots. The Company believes that it might be
possible to lessen  the severity  of neuronal damage  and cognitive  dysfunction
occurring  as a result of such procedures by prophylactic treatment with certain
of the Company's neuroprotective compounds.
 
    Because of the importance of  glutamate receptor-operated calcium influx  in
various  neurological disorders, a number of companies are attempting to develop
antagonists of NMDA receptor-channels as  therapeutics. Most of these  compounds
have  been associated with significant adverse  side effects such as symptoms of
psychosis.  There  are  currently  no  effective  neuroprotective   therapeutics
available that act to slow or stop the progression of brain damage once a stroke
or head trauma has occurred.
 
    PRECLINICAL  DEVELOPMENT STATUS.   Systemic administration  of the Company's
proprietary class of  lead compounds,  particularly NPS  1506, has  demonstrated
significant neuroprotectant activity in certain animal models of ischemic stroke
and  head trauma. In these  animal studies, significant neuroprotectant activity
was still observed when administration of the compound was delayed for two hours
following the  ischemic event.  In addition,  the Company's  compounds have  not
exhibited  PCP-like effects in a variety of  IN VITRO and IN VIVO animal studies
intended to  identify  PCP-like effects.  The  Company is  currently  conducting
preclinical  efficacy, pharmacology and toxicology studies and estimates that it
will file  an IND  for NPS  1506 in  the first  half of  1997. There  can be  no
assurance  that the IND will be filed, or that NPS 1506 or any of the other lead
compounds, will prove safe and  effective, meet applicable regulatory  standards
or  be  successfully  marketed. See  "Risk  Factors  -- Early  Stage  of Product
Development; Dependence on Norcalcin."
 
  CHRONIC PAIN PROGRAM
 
    It is  estimated  that  up  to 30%  of  the  populations  of  industrialized
countries  experience some degree of recurring or chronic pain. Chronic pain can
be defined as that pain which persists a month or longer past the normal time of
healing or which recurs at intervals for months or years. Although chronic  pain
often  results secondarily from  a cause of  acute pain, such  as an injury, the
underlying mechanisms
 
                                       31
<PAGE>
causing chronic pain are believed to be different from those causing acute pain.
The majority of medications used currently to treat chronic pain are the same as
those  used  to treat  acute pain:  conventional analgesics,  including narcotic
analgesics such as morphine. Tricyclic antidepressants and anticonvulsant  drugs
are  also sometimes used  to treat chronic  pain. Many of  the more effective of
these drugs  have  been  associated  with  undesirable  side  effects  including
drowsiness, constipation, cognitive changes and potential addiction.
 
    Glutamate    receptor-operated    calcium   channels,    particularly   NMDA
receptor-channels, have been shown in published studies to play a major role  in
transmitting  neuronal activity  associated with  chronic pain.  The Company has
tested certain  of its  NMDA receptor-channel  antagonist compounds  in  several
widely  used animal models of pain. These compounds have demonstrated palliative
activity, specifically in animal models  of chronic pain. In preclinical  animal
studies  of the Company's  NMDA receptor-channel antagonists,  the compounds did
not exhibit the PCP-like side effects which are often associated with many other
NMDA  receptor-channel  antagonists.  The  Company  is  conducting   preclinical
research  with its lead compounds  with the goal of  identifying a candidate for
preclinical development. There can be no  assurance that lead compounds will  be
identified  as proprietary clinical development candidates, that preclinical and
clinical trials will be conducted, or  that such candidates will prove safe  and
effective, meet applicable regulatory standards or be successfully marketed. See
"Risk Factors -- Early Stage of Product Development; Dependence on Norcalcin."
 
  EPILEPSY PROGRAM
 
    Approximately  2.5 million Americans  have been diagnosed  with epilepsy. It
has been estimated  that at  least 25%  of all  patients with  epilepsy are  not
controlled  adequately by existing medications. In addition, severe side effects
are commonly associated  with currently available  drugs, including  drowsiness,
depression, memory loss and a decrease in mental acuity.
 
    Glutamate,  which is the major excitatory transmitter in the brain, has long
been suspected to play  a major role  in seizure activity  and to contribute  to
epilepsy.  Preclinical studies conducted  by the Company  have demonstrated that
the systemic administration of certain of its proprietary NMDA  receptor-channel
antagonists  provides significant anticonvulsant activity in a variety of animal
models of  epilepsy.  In addition  these  compounds are  active  following  oral
administration,  as would be required for  an anticonvulsant drug being utilized
on a chronic  basis. Similarly,  in these  preclinical animal  studies, the  NPS
compounds  did not exhibit PCP-like side effects typically associated with other
NMDA receptor-channel antagonists. NPS  is conducting preclinical research  with
its  lead compounds  with the  goal of  identifying a  candidate for preclinical
development. There can be no assurance that lead compounds will be identified as
proprietary clinical  development  candidates,  that  preclinical  and  clinical
trials will be conducted, or that such candidates will prove safe and effective,
meet  applicable  regulatory standards  or be  successfully marketed.  See "Risk
Factors -- Early Stage of Product Development; Dependence on Norcalcin."
 
DISCOVERY PROGRAMS
 
    The Company is actively  engaged in several  other discovery programs  which
seek  to identify new molecular targets for  the development of new drugs. These
discovery programs  are  extensions  of the  Company's  discoveries  in  calcium
receptors and ion channels.
 
  METABOTROPIC GLUTAMATE RECEPTORS
 
    Metabotropic  glutamate  receptors  ("mGluRs") are  distinct  from glutamate
receptor-operated calcium channels  and are  uniquely related  in structure  and
function to the parathyroid cell calcium
 
                                       32
<PAGE>
receptor.  The  Company  believes  that  its  experience  in  the  discovery and
development of  drug candidates  which  act at  calcium receptors  provides  the
Company  with certain advantages in the mGluR  field. mGluRs are involved in the
regulation of a number  of important brain functions,  and the Company  believes
that  drugs  which target  specific  mGluRs may  be  useful in  treating various
neurological  disorders,   including   neurodegenerative   disorders   such   as
Alzheimer's  disease,  cognitive  dysfunction, anxiety  and  certain psychiatric
disorders.
 
    NPS scientists have discovered proprietary small molecules which are  active
at  mGluRs.  In addition,  NPS scientists  have  cloned a  novel mGluR  and have
developed proprietary assays, cell lines and  chimeric receptors for use in  the
Company's  mGluR program.  The Company's compounds  have substantially different
structures than existing compounds active  at mGluRs which the Company  believes
could  allow  them  to reach  the  brain more  efficiently.  Medicinal chemistry
efforts with these lead compounds are ongoing at the Company.
 
  ADDITIONAL CALCIUM RECEPTOR THERAPEUTICS
 
    The Company has  established that  it is possible  to preferentially  target
calcium receptors in distinct tissues. Norcalcin, for example, has been shown in
animals  to be  about 40 times  more potent  at affecting PTH  secretion than at
affecting calcitonin  secretion.  Norcalcin  thus  acts  preferentially  at  the
parathyroid  as compared to the C-cells of  the thyroid. The Company has further
established that calcium receptors are not only present on parathyroid cells and
on C-cells but are also present  on several other cell types, including  certain
cells  in the  kidney, intestine, pituitary  gland, pancreas  and brain. Calcium
receptors on such cells  represent potential drug targets  for the treatment  of
diseases other than HPT and osteoporosis.
 
    The  Company  is  actively  pursuing drug  candidates  which  target calcium
receptors in distinct  tissues for the  treatment of several  disorders. In  the
kidney, for example, NPS and its collaborators at Brigham and Women's have shown
that  calcium receptors are abundantly expressed in certain cells which regulate
the excretion and reabsorption of  calcium, magnesium and certain  electrolytes.
Calcium  receptors  are  also expressed  in  cells that  regulate  excretion and
reabsorption of water  in the kidney.  The Company believes  that these  calcium
receptors  participate  in  the  regulation of  mineral,  electrolyte  and fluid
balance in the body and that drugs which target calcium receptors in the  kidney
may  provide  therapies for  abnormal states  of ion  and water  retention. Such
abnormal  states  occur  in  congestive  heart  failure,  for  example,  and  in
nephrolithiasis (kidney stone formation).
 
  INORGANIC ION RECEPTORS
 
    The  Company believes that calcium receptors are representative of a new and
important class of cell surface receptors, receptors that are able to detect and
respond to  changes in  the  concentration of  inorganic  ions such  as  sodium,
chloride,  potassium and phosphate.  It has been  known for some  time that many
different tissues respond  to changes in  the level of  such ions. For  example,
Vitamin  D synthesis and certain critical kidney functions are regulated in part
by changes  in  circulating  phosphate ion  concentrations.  Similarly,  certain
functions  of the adrenal gland are affected by changes in potassium levels, and
the maintenance  of  fluid  concentrations  by  the  brain  may  depend  on  the
activation  of  sodium  receptors.  Therapeutic  agents  that  act  directly  on
receptors for other  ions could  provide effective treatments  for many  disease
states.  As a  result, inorganic  ion receptors  are attractive  targets for the
development of  novel  therapeutic  agents. The  Company's  scientists  and  its
collaborators  at Brigham and Women's are  actively engaged in research to clone
new inorganic ion receptors, to determine  their roles in human physiology,  and
to  discover new  drug candidates  which act  selectively on  such inorganic ion
receptors.
 
                                       33
<PAGE>
  NEURONAL ION CHANNELS
 
    The Company  has isolated,  from  its unique  library of  arthropod  venoms,
various  peptides  that target  neuronal  ion channels,  in  particular, certain
calcium channels and certain potassium  channels. The Company believes that  its
discoveries of such peptide leads provide the Company with opportunities for the
discovery  of drugs  to treat various  neurological disorders.  For example, one
such peptide modulates a particular neuronal  potassium channel by binding at  a
previously  unknown site  on this  channel. Blocking  this potassium  channel in
nerve cells  is known  to  enhance specific  neural activities,  especially  the
prolongation  of neuronal signals that may have a potential palliative effect in
disorders  such  as  Parkinson's  disease,  Alzheimer's  disease  and   multiple
sclerosis.
 
  DRUG DISCOVERY TECHNOLOGIES
 
    The  Company's approach to the  discovery of novel drugs  is to identify new
drug targets and to  identify small molecules which  modulate the activities  of
these  targets (or of previously identified targets) in ways that provide unique
and effective therapies.  NPS has pioneered  the use of  various whole cell  and
tissue  functional screens in its drug  discovery programs. The Company believes
that its functional screens substantially enhance its abilities to discover  new
receptors and ion channels and new drug candidates which modulate the activities
of  specific  receptors or  ion  channels through  novel  mechanisms. Functional
screens were of critical importance, for example, in the Company's discovery  of
Norcalcin  and related molecules  that modulate calcium  receptor function by an
unusual mechanism.
 
    In its drug  discovery programs, the  Company utilizes a  unique library  of
invertebrate venoms. These venoms are isolated from a wide variety of species of
spiders,   scorpions,  centipedes,  parasitic   wasps  and  other  invertebrates
collected from around  the world.  Lead molecules  from this  library have  been
useful  in  the discovery  phases of  many of  the Company's  programs. Examples
include the  first-generation,  small  molecule  Araxin-TM-  ("arachnid  toxin")
compounds which identified a novel site on NMDA receptor-channels, peptide leads
being  used in  the Company's ion  channel discovery efforts,  and early calcium
receptor  agonist  leads.  The  Company  believes  this  library  represents   a
collection  of compounds with unusual biological activities and is a significant
resource to the Company.
 
COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS
 
    NPS is  pursuing research  and product  development both  on an  independent
basis and in collaboration with others. NPS currently has collaborative research
and/or license agreements with Amgen, Kirin, SmithKline Beecham and with Brigham
and  Women's.  See "Risk  Factors --  Dependence  on Collaborative  Research and
License Relationships."
 
  AMGEN INC.
 
    In March 1996, the Company entered into a development and license  agreement
with  Amgen effective December  1995 (the "Amgen  Agreement") which grants Amgen
the exclusive right  to develop  and commercialize Norcalcin  and certain  other
compounds  for  the treatment  of HPT  and  indications other  than osteoporosis
worldwide, excluding Japan,  China, Korea  and Taiwan  (the "Kirin  Territory").
Under  the terms  of the Amgen  Agreement, NPS may  receive from Amgen  up to an
aggregate of  $43.5 million  and  royalties from  any  future product  sales  in
exchange  for exclusive  rights to develop,  manufacture and  sell Norcalcin and
certain other compounds for the treatment of HPT worldwide, excluding the  Kirin
Territory.  Amgen  has assumed  full control,  authority and  responsibility for
conducting, funding and pursuing all aspects of the development, submissions for
regulatory approvals, manufacture and commercialization of Norcalcin and certain
related compounds in the Amgen  Territory, including conducting clinical  trials
and  making regulatory submissions. Amgen has paid NPS an initial non-refundable
license fee of $10.0 million and purchased one million shares of Common Stock at
the
 
                                       34
<PAGE>
price of the Company's  Common Stock in November  1995 when the Amgen  Agreement
was  negotiated for an aggregate purchase price  of $7.5 million. The balance of
the $43.5  million  includes  up  to  $26.0 million  payable  to  NPS  upon  the
achievement   of  specific  development  milestones.   NPS  has  the  option  to
participate with Amgen,  under the  direction of  Amgen, in  the development  of
Norcalcin for HPT, and Amgen is required to reimburse NPS for such participation
which  is limited to a total cost of $400,000 per year for a maximum time period
of five years. Amgen may  terminate the Amgen Agreement  for any reason upon  90
days  written  notice. Termination  of the  Amgen Agreement  will result  in the
reversion to NPS of its technology,  patent and commercialization rights in  the
Amgen  Territory. There can  be no assurance  that Amgen will  not terminate the
Amgen Agreement. Upon a termination of  the license agreement with Kirin,  Amgen
would  receive worldwide rights to develop and commercialize Norcalin. See "Risk
Factors -- Dependence on Collaborative Research and License Relationships."
 
  KIRIN BREWERY COMPANY, LIMITED
 
    In June 1995, the  Company entered into  a five-year collaborative  research
and  license  agreement  with  Kirin  (the  "Kirin  Agreement")  to  develop and
commercialize Norcalcin and  other compounds  for the  treatment of  HPT in  the
Kirin  Territory. Under the terms  of the Kirin Agreement,  NPS may receive from
Kirin up to an aggregate of $25.0 million and royalties from any future  product
sales  in  exchange  for  exclusive  rights  to  develop,  manufacture  and sell
Norcalcin and certain  other compounds  for the treatment  of HPT  in the  Kirin
Territory.  Kirin is  responsible for  conducting clinical  trials and obtaining
regulatory approvals of Norcalcin in the Kirin Territory. Kirin has paid NPS  an
initial,  non-refundable license fee of $5.0  million and committed to make $7.0
million in research payments for the  development of back-up compounds over  the
next five years. Of this $7.0 million, a total of $2.0 million is payable by the
end  of the first year of the  Kirin Agreement. The remaining $13.0 million will
be payable to  NPS upon achievement  of specific development  milestones in  the
United  States and the  Kirin Territory. Kirin  is required to  pay all costs of
developing and commercializing products within the Kirin Territory and will  pay
royalties  to NPS on any product sales.  Kirin may terminate the Kirin Agreement
after June 1996 for any reason upon  90 days written notice. Termination of  the
Kirin  Agreement will result in  the reversion to NPS  of its technology, patent
and commercialization rights in the Kirin  Territory. There can be no  assurance
that  Kirin  will  not  terminate  the Kirin  Agreement.  See  "Risk  Factors --
Dependence on Collaborative Research and License Relationships."
 
  SMITHKLINE BEECHAM CORPORATION
 
    In November 1993, NPS entered  into a three-year collaborative research  and
license  agreement  with  SmithKline  Beecham  (the  "SmithKline  Agreement") to
collaborate on  the  discovery, development  and  marketing of  drugs  to  treat
osteoporosis   and  other  bone  metabolism   disorders.  Under  the  SmithKline
Agreement, SmithKline Beecham has  the exclusive license  to develop and  market
worldwide  any calcium receptor-active compounds  developed under the SmithKline
Agreement that are useful  for treating osteoporosis  and other bone  metabolism
disorders,  excluding HPT. In addition, SmithKline Beecham has a six-month right
of first negotiation of a research  and license agreement with NPS with  respect
to  any  compounds relating  to osteoporosis  not  covered under  the SmithKline
Agreement. Once compounds have been selected for development, SmithKline Beecham
has agreed to conduct and fund  all development of such products, including  all
human  clinical  trials  and  regulatory  submissions.  NPS  has  the  right  to
co-promote (up to 20%  in the United States  territory) with SmithKline  Beecham
any  resulting products in the United States. In 1992, S.R. One, an affiliate of
SmithKline Beecham, purchased $2.0 million of the Company's Preferred Stock.  In
1993,  at the time NPS entered into the SmithKline Agreement, S.R. One purchased
an additional $7.0 million in equity of the Company, and it acquired $495,000 of
Common Stock in  the Company's  initial public  offering. All  of the  Preferred
Stock  was converted into Common Stock upon the closing of the Company's initial
public offering.
 
                                       35
<PAGE>
    Under the terms of the SmithKline Agreement, in addition to the $7.0 million
equity  purchase,  SmithKline   Beecham  paid   the  Company   a  $6.0   million
non-refundable license fee and agreed to make additional payments to the Company
upon  the achievement of  specific milestones. A  $3.0 million milestone payment
was made in  January 1996. In  July 1995, the  Company began receiving  payments
from  SmithKline Beecham  to support  the Company's  research efforts,  and such
payments are expected  to be  approximately $4.3 million  through the  scheduled
expiration of the research term in October 1996. NPS is entitled to royalties on
sales of products for osteoporosis and other bone metabolism disorders developed
by  SmithKline Beecham under the SmithKline Agreement and a share of the profits
from any  co-promotion  of  such  products.  The  SmithKline  Agreement  may  be
terminated  by SmithKline Beecham  upon 30 days written  notice, with NPS having
the right to extend the SmithKline  Agreement for an additional period of  time,
provided that drug marketing has commenced. Funded research under the SmithKline
Agreement  will terminate in October 1996.  Under certain circumstances, NPS has
the right to terminate the SmithKline Agreement after October 1997.  Termination
of  the SmithKline Agreement will result in  reversion to NPS of its technology,
commercialization and patent rights  in the licensed  field of osteoporosis  and
other  bone and mineral disorders as well as all additional technology developed
in the course of  the collaboration. There can  be no assurance that  SmithKline
Beecham will not terminate the SmithKline Agreement or that funded research will
be  extended  upon  its  termination  in  October  1996.  See  "Risk  Factors --
Dependence on Collaborative Research and License Relationships."
 
  THE BRIGHAM AND WOMEN'S HOSPITAL, INC.
 
    In February 1993, NPS entered into two agreements with Brigham and  Women's,
a  sponsored collaborative research agreement (the "Brigham Research Agreement")
and a patent license  agreement (the "Brigham  License Agreement"). Brigham  and
Women's,  an  affiliate  of  Harvard University  Medical  School,  is  a leading
research group in the  area of calcium receptors.  During the three-year  period
from February 1993 through January 1996, NPS paid license fees and made research
support  and milestone  payments to  Brigham and  Women's totaling approximately
$1.0 million. In February  1996, the Company reached  an agreement with  Brigham
and  Women's to extend  the Brigham Research  Agreement. Under the  terms of the
extension, NPS has agreed to continue funding research on calcium receptors  and
other  inorganic  ion receptors  at Brigham  and Women's  for an  additional two
years. The extended Brigham  Research Agreement calls for  NPS to make  research
support  and advance royalty payments of  $810,000 to Brigham and Women's during
the period from February 1996 through February 1998. Of this, a $100,000 prepaid
royalty was paid in February 1996 incident to the agreed extension. The  Brigham
License  Agreement  grants  NPS an  exclusive  license to  calcium  receptor and
inorganic ion receptor technology arising under the Brigham Research  Agreement.
The  Brigham Research Agreement also grants NPS a right of first negotiation for
exclusive license rights to any other  patentable subject matter arising out  of
the sponsored research. NPS also has agreed to pay Brigham and Women's a royalty
on  sales of any products covered by  an issued patent under the Brigham License
Agreement and to promote sales  of any licensed products  for HPT for which  the
Company receives regulatory approval.
 
PATENTS AND PROPRIETARY TECHNOLOGY
 
    Periodically  the Company  files patent applications  to protect technology,
inventions and  improvements which  the Company  believes are  important to  the
development of its business. The Company also relies on trade secrets, know-how,
continuing  technological innovations and licensing opportunities to develop and
maintain its competitive position.
 
    The Company files patent applications in its own name, and when appropriate,
it has filed,  and expects to  continue to file,  applications jointly with  its
collaborators.  These patent applications cover  compositions of matter, methods
of treatment, methods of  discovery, use of novel  compounds and novel modes  of
action,  and  recombinantly expressed  receptors  and gene  sequences  which are
believed by  the  Company  to  be important  in  its  research  and  development
activities. None of the Company's principal proprietary rights, including rights
related   to   process,   compounds,   use   and   technique   related   to  its
 
                                       36
<PAGE>
calcium receptor science and NMDA receptor-channel technology, are protected  by
issued patents in the Company's principal markets. The Company believes that its
pending  patent applications in  the fields of  calcium receptors, inorganic ion
receptors, mGluRs and NMDA  receptor-channels and compounds  active at the  same
give the Company a competitive advantage. The Company intends to file additional
patent  applications as appropriate  relating to its  technology and to specific
products of the Company.
 
    The patent positions  of pharmaceutical and  biotechnology firms,  including
the  Company, are uncertain and involve  complex legal and factual questions. In
addition, the scope of the claims  in a patent application can be  significantly
modified  during  prosecution before  the  patent is  issued.  Consequently, the
Company does  not  know whether  any  of its  applications  will result  in  the
issuance  of patents or,  if any patents  are issued, whether  they will provide
significant proprietary  protection  or  will be  circumvented  or  invalidated.
Generally,  patent applications in  the United States  are maintained in secrecy
until patents issue and publication of  discoveries in the scientific or  patent
literature often lag behind actual discoveries. In addition, no assurance can be
given  that, even  if published,  the Company is  aware of  all such literature.
Accordingly, the Company  cannot be certain  that the named  inventors were  the
first  to invent or that the Company is  the first to pursue patent coverage for
such inventions. Moreover, the Company  may have to participate in  interference
proceedings  declared  by  the  United States  Patent  and  Trademark  Office to
determine priority of invention, which could  result in substantial cost to  the
Company,  even if the eventual outcome is favorable to the Company. There can be
no assurance that the Company's pending patent applications, if issued, would be
held valid.  An  adverse  outcome  could  subject  the  Company  to  significant
liabilities  to third parties, could require disputed rights to be licensed from
third parties  or  require the  Company  to cease  or  modify its  use  of  such
technology. Additionally, many of the Company's foreign patent applications have
been  published as  part of  the patent  prosecution process  in such countries.
Protection of the rights revealed in  such published patent applications can  be
complex, costly and uncertain. See "Risk Factors -- Uncertainty of Protection of
Patents and Proprietary Technology."
 
    The  development of therapeutic  products for applications  in the Company's
product fields is intensely competitive.  A number of pharmaceutical  companies,
biotechnology  companies,  universities  and  research  institutions  have filed
patent applications or  received patents in  these and related  fields. Some  of
these  applications or patents may limit  or preclude the Company's applications
and could result  in a significant  reduction of the  coverage of the  Company's
patents, if issued.
 
    NPS also relies on trade secrets and contractual arrangements to protect its
trade secrets. There can be no assurance that these agreements will be adequate,
that  they will not be  breached, that the Company  would have adequate remedies
for any breach  or that the  Company's trade secrets  will not otherwise  become
known or be independently discovered by competitors.
 
    Much  of the know-how important to the  Company's technology and many of its
processes are  dependent  upon  the  knowledge, experience  and  skills  of  key
scientific  and technical  personnel and are  not the subject  of pending patent
applications or  issued patents.  To  protect its  rights  to its  know-how  and
technology,  the  Company  requires  all  employees,  consultants,  advisors and
collaborators  to  enter  into  confidentiality  agreements  that  prohibit  the
unauthorized  use and restrict  the disclosure of  confidential information, and
require disclosure  and  assignment  to  the  Company  of  ideas,  developments,
discoveries  and inventions made by  them. There can be  no assurance that these
agreements will  effectively prevent  disclosure of  the Company's  confidential
information or will provide meaningful protection for the Company's confidential
information  if  there  is  unauthorized  use or  disclosure.  It  must  also be
recognized that competitors  may develop substantially  equivalent know-how  and
technology.
 
    In  connection with certain research  in the field of  calcium and other ion
receptors, NPS  has  sponsored research  by  various university  and  government
laboratories.  For example, the  Company has executed a  license agreement and a
research agreement  regarding research  in the  area of  calcium and  other  ion
receptors  with Brigham and  Women's. See "Collaborative  Research and Licensing
Agreements -- The Brigham and Women's Hospital, Inc."
 
                                       37
<PAGE>
    The Company  has  also  sponsored  work at  other  government  and  academic
laboratories  for  various  evaluations,  assays, screenings  and  tests  of its
natural products library and lead compounds in the central nervous system field.
Generally, under these agreements the Company funds the work of investigators in
exchange for the results  of the specified  works and the right  or option to  a
license  to  any  patentable inventions  that  may result  in  designated areas.
Generally, if the sponsored work produces patentable subject matter, the Company
has the  first right  to negotiate  for license  rights therein.  Any  resulting
license  would be expected to require the  Company to pay royalties on net sales
of licensed products. There  can be no assurance  that any such inventions  will
arise, that any patent applications thereon will be filed or, if filed, that any
patents  will issue,  that any  license thereon can  be negotiated,  or that any
license agreement would give the Company valuable rights.
 
MANUFACTURING
 
    NPS anticipates that all of its products will be made by synthetic  chemical
manufacturing  techniques. As  such, the Company  believes the  compounds can be
precisely defined and  characterized and  should generally  have relatively  low
manufacturing   costs  compared   to  recombinant   proteins  produced   by  the
fermentation methods common to currently available biotechnology products.
 
    NPS has no manufacturing facilities.  Under the Amgen, Kirin and  SmithKline
Agreements,  each of  such Licensee  is responsible  for the  manufacture of the
applicable product. The  Company relies  on other manufacturers  to produce  its
proprietary  compounds for research and development activities and in sufficient
quantities for preclinical  and clinical purposes.  The proposed  pharmaceutical
products  under development  by the  Company have  never been  manufactured on a
commercial scale,  and there  can be  no  assurance that  such products  can  be
manufactured at a cost or in quantities to make them commercially viable. If the
Company  were  unable to  contract  for sufficient  supply  of its  compounds on
acceptable terms,  or if  it  should encounter  delays  or difficulties  in  its
relationships  with manufacturers, the Company's  preclinical and human clinical
testing schedule would be delayed. Such  delay might postpone the submission  of
products for regulatory approval or the market introduction and subsequent sales
of  such products, which would have a  materially adverse effect on the Company.
Moreover, contract manufacturers that  the Company may use  must adhere to  cGMP
regulations enforced by the FDA through its facilities inspection program.
 
GOVERNMENT REGULATION
 
    The  production and  marketing of the  Company's product  candidates and its
research and  development  activities  are subject  to  regulation  for  safety,
efficacy  and quality by numerous governmental  authorities in the United States
and other countries.  In the United  States, drugs are  subject to rigorous  FDA
regulation.  The  Federal  Food, Drug  and  Cosmetic  Act, as  amended,  and the
regulations promulgated thereunder,  and other  federal and  state statutes  and
regulations  govern,  among  other  things,  the  testing,  manufacture, safety,
efficacy, labeling, storage, record keeping, approval, advertising and promotion
of  the  Company's  products.  Product  development  and  approval  within  this
regulatory  framework  take a  number of  years and  involve the  expenditure of
substantial resources.
 
    The steps required  before a  pharmaceutical agent  may be  marketed in  the
United States include: (i) preclinical laboratory tests, animal pharmacology and
toxicology studies and formulation studies; (ii) the submission to the FDA of an
IND  for  human  clinical  testing, which  must  become  effective  before human
clinical trials  commence; (iii)  adequate  and well-controlled  human  clinical
trials  to establish the safety and efficacy of the drug; (iv) the submission of
a New Drug Application ("NDA") to the FDA; and (v) FDA approval of the NDA prior
to any commercial sale  or shipment of  the drug. In  addition to obtaining  FDA
approval  for each product, each  domestic drug manufacturing establishment must
be registered with, and  approved by, the FDA  under cGMP regulations.  Domestic
drug  manufacturing establishments are subject to regular inspections by the FDA
and must comply with cGMP regulations.
 
                                       38
<PAGE>
To  supply  products  for  use  in  the  United  States,  foreign  manufacturing
establishments  must comply  with cGMP regulations  and are  subject to periodic
inspection by the  FDA or  by corresponding  regulatory agencies  in their  home
countries under reciprocal agreements with the FDA.
 
    Preclinical   studies  include   the  laboratory  evaluation   of  IN  VITRO
pharmacology product chemistry  and formulation,  as well as  animal studies  to
assess  the  potential safety  and efficacy  of the  product. Compounds  must be
formulated according to cGMP, and preclinical safety tests must be conducted  by
laboratories   that  comply  with  FDA  regulations  regarding  Good  Laboratory
Practices. The results of the preclinical tests are submitted to the FDA as part
of an  IND and  are reviewed  by  the FDA  prior to  the commencement  of  human
clinical  trials. Unless the FDA objects to  an IND, the IND will usually become
effective 30 days following its  receipt by the FDA.  There can be no  assurance
that  submission of an IND will result in FDA authorization to commence clinical
trials.
 
    Clinical trials involve the administration  of the investigational new  drug
to  healthy  volunteers and  to patients  under the  supervision of  a qualified
principal investigator. Clinical  trials are conducted  in accordance with  Good
Clinical  Practices 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 conducted under the auspices of an Internal
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.
 
    Clinical trials typically  are conducted in  three sequential phases,  which
phases  may  overlap. In  Phase I,  the  initial introduction  of the  drug into
healthy subjects,  the  drug is  tested  for safety  (adverse  effects),  dosage
tolerance,  metabolism, distribution,  excretion and  pharmacodynamics (clinical
pharmacology). Phase II involves studies in a limited patient population to: (i)
determine the  efficacy of  the drug  for specific,  targeted indications;  (ii)
determine  dosage  tolerance and  optimal  dosage; and  (iii)  identify possible
adverse effects and safety risks. When a  compound is found to be effective  and
to  have an acceptable safety profile in  Phase II evaluations, Phase III trials
are undertaken to  evaluate further clinical  efficacy and to  test further  for
safety  within  an  expanded  patient  population  at  geographically  dispersed
clinical study sites. There can be no assurance that Phase I, Phase II or  Phase
III  testing will be completed successfully  within any specific time period, if
at all, with respect to any of  the Company's products subject to such  testing,
including  Norcalcin. Furthermore, the Company,  its collaborators, Licensees or
the FDA may suspend clinical trials at  any time if they feel that the  subjects
or  patients are being exposed to an unacceptable health risk. See "Risk Factors
- - -- Government Regulation; No Assurance of Regulatory Approval."
 
    The results  of  the  pharmaceutical development,  preclinical  studies  and
clinical  studies are submitted to the FDA in the form of an NDA for approval of
the marketing and  commercial shipment  of the  drug. The  testing and  approval
process  is likely to require  substantial time and effort,  and there can be no
assurance that any approval will  be granted on a timely  basis, if at all.  The
FDA may deny an NDA if applicable regulatory criteria are not satisfied, require
additional  testing  or  information,  or  require  post-marketing  testing  and
surveillance to monitor the safety of the Company's products if the FDA does not
view the NDA as containing adequate evidence  of the safety and efficacy of  the
drug. Notwithstanding the submission of such data, the FDA may ultimately decide
that  the application  does not  satisfy its  regulatory criteria  for approval.
Moreover, if regulatory approval of a drug is granted, such approval may  entail
limitations on the indicated uses for which it may be marketed. Finally, product
approvals  may  be  withdrawn if  compliance  with regulatory  standards  is not
maintained or if problems occur following initial marketing.
 
    Among  the  conditions  for  NDA  approval  is  the  requirement  that   the
prospective  manufacturer's quality control and manufacturing procedures conform
to cGMP, which must be  followed at all times.  In complying with standards  set
forth  in these regulations,  manufacturers must continue  to expend time, money
and effort  in  the  area of  production  and  quality control  to  ensure  full
technical  compliance. See "Risk Factors  -- Government Regulation; No Assurance
of Regulatory Approval."
 
                                       39
<PAGE>
    In addition to regulations enforced by the FDA, 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  future federal, state or local regulations.
The Company's research and development activities involve the controlled use  of
hazardous  materials, chemicals and various  radioactive compounds. Although the
Company believes that its safety procedures  for handling and disposing of  such
materials comply with the standards prescribed by state and federal regulations,
the  risk of accidental  contamination or injury from  these materials cannot be
completely eliminated. In the  event of such an  accident, the Company could  be
held liable for any damages that result, and any such liability could exceed the
resources of the Company. See "Risk Factors -- Risk of Product Liability; Use of
Hazardous Materials."
 
    Outside  the United  States, the  Company's ability  to market  a product is
contingent  upon  receiving  a  marketing  authorization  from  the  appropriate
regulatory  authority. This foreign regulatory  approval process includes all of
the risks associated with FDA approval set forth above.
 
COMPETITION
 
    NPS is pursuing areas of product  development in which the Company  believes
there  is a potential for extensive technological innovation in relatively short
periods of time. The Company operates in a field in which new discoveries  occur
and are expected to occur at a rapid pace. The Company's competitors may succeed
in developing technologies or products that are more effective than those of the
Company  or in obtaining  regulatory approvals of their  drugs more rapidly than
the Company  and its  collaborative  partners, and  could render  the  Company's
products  obsolete or noncompetitive. Competition in the pharmaceutical industry
is intense  and is  expected to  continue  to increase.  Many of  the  Company's
competitors,  including biotechnology and pharmaceutical companies, are actively
engaged in the research  and development of products  in the Company's  targeted
areas,  including the fields of HPT, osteoporosis, neuroprotection, chronic pain
and epilepsy.  Many  of the  Company's  competitors have  substantially  greater
financial,  technical, marketing  and personnel  resources than  the Company. In
addition, some  of them  have considerable  experience in  preclinical  testing,
human  clinical  trials  and  other  regulatory  approval  procedures. Moreover,
certain  academic  institutions,  governmental   agencies  and  other   research
organizations  are conducting research in areas in which the Company is working.
These institutions are becoming  increasingly aware of  the commercial value  of
their  findings and  are becoming more  active in seeking  patent protection and
licensing arrangements to collect royalties for use of technology that they have
developed. These institutions may also market competitive commercial products on
their own  or  through joint  ventures  and will  compete  with the  Company  in
recruiting highly qualified scientific personnel. There can be no assurance that
a  pharmacological method of  treatment for certain diseases,  such as HPT, will
prove to be superior to existing or newly discovered approaches to the treatment
of those  diseases. See  "Risk Factors  -- Rapid  Technological Change;  Intense
Competition."
 
ENVIRONMENTAL LIABILITY
 
    On  November 29, 1995, the Company received  a letter from the EPA notifying
the Company that  it may  have incurred liability  under section  107(a) of  the
Comprehensive   Environmental  Response,  Compensation  and  Liability  Act,  as
amended, for two barrels of radioactive waste taken by a third party  contractor
to a hazardous and radioactive waste storage, treatment and disposal facility in
Denver,  Colorado. Upon the EPA's request,  the Company has identified the waste
and has verified that  the barrels containing the  waste have been removed  from
the  Denver,  Colorado  facility.  Removal  of  wastes  from  the  facility  and
remediation of soil and groundwater at this site is currently underway. To date,
the EPA has spent $2.1 million to clean up this facility. However, the  ultimate
cost  of removal and remediation actions and the length of time for such actions
are difficult to estimate. Based upon its inspection of the site, the Company is
of the belief that the barrels containing  the waste disposed of by the  Company
were  neither leaking nor damaged. Although  the Company was a small contributor
to the site and the
 
                                       40
<PAGE>
Company believes  that  there are  a  number of  other  financially  responsible
contributors, there can be no assurance that the Company will not be held liable
for  all  or  a portion  of  the cleanup  cost  or  any other  costs  or damages
associated with  this  disposal site.  See  "Risk  Factors --  Risk  of  Product
Liability; Use of Hazardous Materials."
 
EMPLOYEES
 
   
    As of March 31, 1996, NPS employed 79 individuals full-time, 21 of whom hold
Ph.D.  or M.D. degrees and 16 of whom hold other advanced degrees. Approximately
60 full-time  employees  are engaged  in  research and  development  activities,
including  a  variety  of disciplines  within  the areas  of  molecular biology,
pharmacology, medicinal chemistry, computer  sciences and clinical  development.
Approximately  19  full-time  employees  are  employed  in  finance,  legal  and
regulatory  affairs,  market   research,  corporate   development  and   general
administrative  activities.  None  of  the  Company's  employees  is  covered by
collective bargaining agreements,  and management considers  relations with  its
employees  to be  good. Additionally, NPS  augments its  full-time staff through
consulting arrangements with experienced scientists and managers. The  Company's
anticipated   growth  and  expansion  will  require  the  hiring  of  additional
management, research and development, and administrative personnel.
    
 
FACILITIES
 
    NPS  currently  occupies   approximately  34,000  square   feet  of   leased
laboratory,  support and administrative space in the University of Utah Research
Park and has an option  for an additional 10,000  square feet. The Company  pays
approximately  $525,000 annually under its facilities  lease. The lease on these
facilities expires in September 1999. The Company believes that these facilities
should be sufficient to meet the Company's needs through September 1999.
 
                                       41
<PAGE>
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
   
    The  following table sets forth certain information concerning directors and
executive officers of the Company:
    
 
   
<TABLE>
<CAPTION>
                    NAME                           AGE                                POSITION
- - ---------------------------------------------      ---      ------------------------------------------------------------
<S>                                            <C>          <C>
Hunter Jackson, Ph.D.........................          45   Chief Executive Officer, President and Chairman of the Board
James U. Jensen, J.D.........................          51   Vice President, Corporate Development and Legal Affairs,
                                                             Secretary and Director
Thomas B. Marriott, Ph.D.....................          47   Vice President, Development Research
Robert K. Merrell............................          40   Vice President, Finance, Chief Financial Officer and
                                                             Treasurer
Edward F. Nemeth, Ph.D.......................          43   Vice President, Research
Doug Reed, M.D...............................          41   Vice President, Business Development and Director
Santo J. Costa, J.D..........................          49   Director
James G. Groninger (1)(2)....................          51   Director
Donald E. Kuhla, Ph.D........................          52   Director
Thomas N. Parks, Ph.D........................          45   Director
Timothy J. Rink, M.D., Sc.D. (1).............          50   Director
Jesse I. Treu, Ph.D. (1)(2)..................          48   Director
</TABLE>
    
 
- - --------------
(1) Member of the Compensation Committee
   
(2) Member of the Audit Committee
    
 
    HUNTER JACKSON, PH.D., has been Chief Executive Officer and Chairman of  the
Board  since founding the  Company in 1986.  He was appointed  to the additional
position of President in January 1994. Prior to founding the Company, he was  an
Associate  Professor  in the  Department of  Anatomy at  the University  of Utah
School of Medicine. Dr. Jackson received  a B.A. in English from the  University
of  Illinois  and a  Ph.D. in  Psychobiology from  Yale University.  He received
postdoctoral training in the Department of Neurosurgery, University of  Virginia
Medical School.
 
    JAMES  U. JENSEN, J.D.,  has been Vice  President, Corporate Development and
Legal Affairs since August  1991. He has  been Secretary and  a director of  the
Company  since 1987. From 1986 to July 1991, he was a partner in the law firm of
Woodbury, Jensen, Kesler & Swinton, P.C. (or its predecessor firm) concentrating
on technology transfer and licensing  and corporate finance. Currently, he  also
serves  as counsel to Woodbury & Kesler, P.C. From July 1985 until October 1986,
he served as chief  financial officer of Cericor,  a software company, and  from
1983  to July 1985, as outside general counsel.  From 1980 to 1983, he served as
General Counsel and Secretary of Dictaphone Corporation, a subsidiary of  Pitney
Bowes  Inc.  He  serves as  a  director  of Wasatch  Funds,  Inc.,  a registered
investment company,  and of  Interwest Home  Medical, Inc.,  a public  home  use
medical equipment distributor. Mr. Jensen received a B.A. in English/Linguistics
from the University of Utah and a J.D. and an M.B.A. from Columbia University.
 
    THOMAS  B. MARRIOTT,  PH.D., has  been Vice  President, Development Research
since August  1993. From  February 1990  to July  1993, he  served as  Director,
Clinical  Investigations for  McNeil Pharmaceutical,  a subsidiary  of Johnson &
Johnson, with  responsibility for  developing  and implementing  clinical  trial
strategies  for a  number of  products. From 1986  until 1990,  Dr. Marriott was
Director, Drug  Metabolism for  McNeil  Pharmaceutical with  responsibility  for
planning,  initiating and completing bioanalytical drug disposition and clinical
biopharmaceutics and  pharmacokinetics  research  required for  INDs  and  NDAs.
 
                                       42
<PAGE>
In  this position, he participated  in the preparation of  several INDs and NDAs
with responsibility  for preparing  or supervising  the preparation  of the  IND
preclinical  drug  metabolism  section  and  the  NDA  preclinical  and clinical
metabolism and biopharmaceutics  sections, and was  responsible for  integrating
the pharmacology, toxicology and clinical sections of INDs and NDAs. He received
a  B.S. in  Chemistry from Carleton  College and  a Ph.D. in  Chemistry from the
Institute of Molecular Biology at the University of Oregon.
 
    ROBERT K. MERRELL has been Vice President, Finance, Chief Financial  Officer
and  Treasurer since  January 1995  and previously  was Director  of Finance and
Administration and Treasurer from December 1993 to December 1994. He joined  the
Company  as Controller/Treasurer in September 1988. Prior to that time, he was a
Senior Manager at KPMG Peat Marwick LLP. Mr. Merrell has been a licensed  C.P.A.
since  1980. He received a B.A. in Accounting from the University of Utah and an
M.M. from Northwestern University.
 
    EDWARD F. NEMETH,  PH.D., has  been Vice President,  Research since  January
1994. He joined the Company as Director of Pharmacology in March 1990. From 1986
until  joining  the  Company,  Dr.  Nemeth was  an  Assistant  Professor  in the
Department of  Physiology  and Biophysics  at  Case Western  Reserve  University
School  of Medicine. He holds  a B.A. in Chemistry  and Psychology from Lawrence
University and a Ph.D.  in Pharmacology from Yale  University. Dr. Nemeth was  a
postdoctoral fellow in Neurobiology at the National Institutes of Health.
 
   
    DOUG  REED, M.D., has been Vice  President, Business Development since April
1996 and has been  a director of  the Company since 1992.  Prior to becoming  an
officer  of the  Company, Dr. Reed  was a  member of the  Audit and Compensation
Committees from 1994 to 1996. From May 1989 until joining the Company, Dr.  Reed
was  a Vice President of S.R. One, a venture capital firm. From 1985 to 1987, he
was Assistant Professor at Yale University School of Medicine. He is a  director
of  IBAH, Inc., a  clinical research and  pharmaceutical formulation development
company as well as several private companies. Dr. Reed received an M.D. from the
University of Missouri and an M.B.A.  from the Wharton School at the  University
of Pennsylvania.
    
 
    SANTO J. COSTA, J.D., has served as a director since January 1995. Mr. Costa
has  served as  President, Chief Operating  Officer and a  director of Quintiles
Transnational  Corporation,   a   publicly   held   global   contract   research
organization,  since April 1994.  From 1986 to  1993, he was  employed by Glaxo,
Inc. where  he  served as  Senior  Vice President,  Administration  and  General
Counsel and was a member of that company's Board of Directors. From 1977 to 1986
he  was employed  by Merrell  Dow Pharmaceuticals  (now Hoechst  Marion Roussel)
where he served  as U.S.  Area Counsel  and from  1971 to  1977 as  Food &  Drug
Counsel  for  Norwich/Eaton  Pharmaceuticals.  Mr. Costa  received  his  B.S. in
Pharmacy and his J.D. from St. John's University.
 
    JAMES G. GRONINGER has served  as a director since 1988  and as a member  of
the  Audit  and Compensation  Committees since  1994.  Mr. Groninger  founded in
January  1995  and  is  President  of   The  Bay  South  Company,  a   Richmond,
Virginia-based  provider of financial advisory  and investment banking services.
From 1988 through  1994, he served  as a Managing  Director, Investment  Banking
Division,  of  PaineWebber Incorporated.  Currently he  serves  on the  Board of
Directors of Designs,  Inc., a specialty  retailer, and Cygne  Designs, Inc.,  a
manufacturer   of  apparel.  Mr.   Groninger  received  a   B.S.  in  Industrial
Administration from Yale University and an M.B.A. from Harvard Business School.
 
    DONALD E. KUHLA, PH.D., has been a director of the Company since 1991. Since
1994, he  has  been  Vice  President of  Plexus  Ventures,  Inc.  ("Plexus"),  a
biotechnology  investment and consulting firm. From 1990 to 1994, Dr. Kuhla held
senior management  positions  with  two venture  capital  backed,  biotechnology
start-up  companies. His early career was  spent in research and development and
operations management positions with Pfizer Inc. and Rorer Group, Inc., his last
position at Rorer being Senior Vice President of Operations. Dr. Kuhla  received
a  B.A. in Chemistry from  New York University and  a Ph.D. in Organic Chemistry
from Ohio State University.
 
                                       43
<PAGE>
   
    THOMAS N.  PARKS,  PH.D., has  been  a director  of  the Company  since  its
founding in 1986. Dr. Parks also serves as a scientific consultant to NPS. He is
currently  the George and Lorna Winder Professor of Neuroscience and Chairman of
the Department of  Neurobiology and Anatomy  at the University  of Utah  Medical
School.  In 1978, Dr. Parks joined the faculty at the University of Utah Medical
School as an assistant professor. Dr. Parks received a B.S. in Biology from  the
University  of  California at  Irvine  and a  Ph.D.  in Psychobiology  from Yale
University. He  was  a  postdoctoral  fellow in  Development  Neurology  at  the
University of Virginia Medical School.
    
 
    TIMOTHY  J. RINK, M.D., SC.D., has been a director of the Company since 1991
and a member of the Compensation Committee since 1994. Dr. Rink also serves as a
scientific consultant to  the Company. Since  February 1996, Dr.  Rink has  been
Chairman,   Chief  Executive   Officer  and  President   of  Aurora  Biosciences
Corporation, a  biotechnology  company focused  on  ultra high  throughput  drug
screening.  From 1990 through 1995 he was President, Chief Technical Officer and
director of Amylin Pharmaceuticals, Inc., a biotechnology company. He is also  a
director  of CoCensys, Inc., a publicly  held biotechnology company. Dr. Rink is
an adjunct Professor  of Pharmacology  at the  University of  California at  San
Diego  and was a lecturer  in physiology at the  University of Cambridge, United
Kingdom, from 1978 to 1984. From 1984 to 1990, he was Vice President of Research
at SmithKline Beecham,  plc. Dr. Rink  received an  M.D. and an  Sc.D. from  the
University of Cambridge.
 
    JESSE  I. TREU, PH.D., has  been a director of the  Company since 1992 and a
member of the  Audit and  Compensation Committees since  1994. He  is a  general
partner  of  Domain  Associates, a  venture  capital firm  specializing  in life
sciences. Dr. Treu is  a director of DNX  Corporation, a pharmaceutical  testing
company,   Geltex   Pharmaceuticals,  Inc.,   a   developer  of   polymer  based
pharmaceuticals, and Lumisys, Inc.,  an electro-optical systems company.  Before
joining  Domain Associates in 1986, he was a principal of Channing, Weinberg and
Company, Inc. and its venture capital  spin-off CW Ventures, and was a  director
of  several  development-stage companies.  From  1977 to  1982,  Dr. Treu  was a
technical director of Technicon  Corporation responsible for marketing  strategy
and new product development in immunology and histopathology and previously held
research  and development  management and  corporate staff  positions at General
Electric  Company.  Dr.  Treu  received  a  Ph.D.  in  Physics  from   Princeton
University.
 
    Several  of the Company's  directors also serve as  officers or directors of
other biotechnology companies,  and areas of  interest to the  Company may  from
time  to  time  overlap with  the  interest  of other  companies  for  which the
Company's directors also serve as  directors. Notwithstanding provisions of  the
Company's Certificate of Incorporation and Bylaws eliminating monetary liability
and   providing  for  indemnification  of  directors  generally,  the  Company's
directors have a  duty of loyalty  to the  Company under Delaware  law. See  "--
Limitation  of Liability and Indemnification Matters." The Company believes that
its directors are sophisticated in their understanding of fiduciary duties. Such
directors typically have their own counsel  to provide guidance with respect  to
any  issues that  may arise  with respect  to such  duties. It  is the Company's
belief that, in most cases, there is no actual or potential conflict of interest
because other companies for which the Company's directors serve as directors are
engaged in unrelated or otherwise distinct areas of research and development. To
date, service by  its directors on  the boards  of directors or  as officers  of
other  biotechnology companies has not presented  any significant issues for the
Company. Should any such  issues arise, the  Company will institute  appropriate
procedures,  which may include  having a particular  director recuse himself, or
otherwise limiting  dissemination of  information regarding  particular  product
programs  that overlap with areas of interest  of another company for which such
director also serves as a director.
 
COMMITTEES
 
   
    The Audit  Committee consists  of  Mr. Groninger  and  Dr. Treu.  The  Audit
Committee  makes  recommendations  to  the  Board  regarding  the  selection  of
independent auditors, reviews the results and scope of audits and other services
provided by the  Company's independent  auditors and reviews  and evaluates  the
Company's internal audit controls.
    
 
                                       44
<PAGE>
   
    The Compensation Committee consists of Mr. Groninger, Dr. Rink and Dr. Treu.
The  Compensation Committee makes  recommendations to the  Board concerning cash
and  long-term  incentive  compensation  for  employees  of  the  Company.   The
Compensation  Committee also  makes recommendations  to the  Board regarding the
number of shares  that should be  subject to  options, the timing  of grants  of
options  under the  Company's 1987 Stock  Option Plan and  1994 Equity Incentive
Plan and the  number of shares  and the timing  of offerings of  such shares  to
employees under the Employee Stock Purchase Plan.
    
 
DIRECTORS' COMPENSATION
 
    The  Company's directors do not currently  receive any cash compensation for
service on the Board or any  Committee thereof. Directors may be reimbursed  for
certain  expenses in connection with attendance at Board and Committee meetings.
Directors are eligible  to receive  stock options  and stock  bonuses under  the
stock plans described below.
 
    In  January  1994,  the  Board adopted,  and  the  stockholders subsequently
approved, the 1994  Non-Employee Directors' Stock  Option Plan (the  "Directors'
Plan").  Under the  Directors' Plan, non-employee  directors of  the Company are
eligible to  receive options.  Options  granted under  the Directors'  Plan  are
non-discretionary  and do not qualify as  Incentive Stock Options ("ISOs") under
the Internal Revenue  Code of  1986, as amended  (the "Code").  Pursuant to  the
terms  of the Directors' Plan, each person who  is elected for the first time to
be a director of the Company and who is not otherwise employed by the Company or
an affiliate of the  Company (a "Non-Employee  Director") will automatically  be
granted  an  option  to  purchase  15,000 shares  of  Common  Stock  (subject to
adjustment as provided  in the  Directors' Plan)  upon the  date of  his or  her
election  to the  Board. On  December 1  of each  year, beginning  in 1994, each
person who is then a Non-Employee Director and has been a Non-Employee  Director
for  at least three months  will automatically be granted  an option to purchase
3,000 shares  of  Common  Stock  (subject  to  adjustment  as  provided  in  the
Directors'  Plan) pursuant to the  Directors' Plan. A total  of 90,000 shares of
Common Stock has been reserved for issuance under the Directors' Plan.
 
    No option  granted under  the Directors'  Plan may  be exercised  after  the
expiration  of ten years from the date  such option was granted. Options granted
under the Directors' Plan  vest at a rate  of 28% of the  shares subject to  the
option one year after date of grant and 3% of the shares become exercisable each
month thereafter, provided that the optionee has, during the entire period prior
to  such vesting  date, continuously served  as a Non-Employee  Director. If the
optionee's service as a  Non-Employee Director terminates  for any reason  other
than  death, the option will remain exercisable  for 12 months after the date of
termination, or until the option's expiration date, if earlier. If the  optionee
dies,  the option will  remain exercisable for  18 months following  the date of
death or until  the expiration  date of the  option, whichever  is earlier.  The
exercise  price of options granted under the Directors' Plan is 100% of the fair
market value of the Common Stock on the date of grant. Options granted under the
Directors' Plan are generally  non-transferable. Unless otherwise terminated  by
the Board, the Directors' Plan automatically terminates in January 2004.
 
    As  of December 31,  1995, options to  purchase a total  of 54,000 shares of
Common Stock had been granted under the Directors' Plan at exercise prices  from
$3.00  to $8.25 per  share, and a  weighted average exercise  price of $5.04 per
share. As of that date, no options had been exercised under the Directors' Plan.
Prior to the  adoption of the  Directors' Plan, the  Company granted options  to
directors under the 1987 Stock Option Plan.
 
    In  December 1994, the Board adopted the Non-Employee Directors' Stock Bonus
Program under the 1994 Equity Incentive Plan (the "Stock Bonus Program").  Under
the  Stock Bonus Program, Non-Employee Directors  are eligible to receive grants
of shares of Common  Stock for attendance at  Board and Committee meetings.  The
Stock  Bonus Program provides  each Non-Employee Director of  the Company with a
non-discretionary award of  200 shares  of Common  Stock for  each Board  and/or
Committee  meeting attended  by such  Non-Employee Director.  A total  of 12,400
shares was granted under the Stock Bonus Program for meetings attended in 1995.
 
                                       45
<PAGE>
    The right  to receive  awards under  the Stock  Bonus Program  is  generally
non-transferable.  The stock awards are  made at the end  of each calendar year.
Non-Employee Directors  entitled to  stock bonus  awards shall  not possess  any
rights  of a stockholder of  the Company until such  shares are delivered to the
Non-Employee Director. Unless otherwise terminated by the Board, the Stock Bonus
Program terminates in January 2004.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
   
    Mr. Groninger  and Drs.  Reed,  Rink and  Treu  served on  the  Compensation
Committee in fiscal 1995. Upon becoming an officer of the Company in April 1996,
Dr.  Reed resigned  as a  member of  the Compensation  and Audit  Committees. No
officer or employee of the Company sits on the Compensation Committee. No member
of the Compensation Committee has at any time been an officer or employee of the
Company.
    
 
    Dr. Treu, a  director of the  Company since  1992, is a  general partner  of
Domain  Associates,  which  is  the United  States  venture  capital  advisor to
Biotechnology Investments Limited ("BIL") pursuant to a contractual arrangement,
and a general partner  of One Palmer  Square Associates II,  L.P., which is  the
general  partner of  Domain Partners  II, L.P.  In the  Company's initial public
offering in May  1994, Domain Partners  II, L.P. and  BIL purchased 180,000  and
50,000 shares of Common Stock, respectively.
 
    Dr.  Reed, a director of the Company since 1992, is a Vice President of S.R.
One. In  November 1993,  the  Company entered  into a  three-year  collaborative
research  and license  agreement with SmithKline  Beecham to  collaborate on the
discovery, development and marketing  of drugs to  treat osteoporosis and  other
bone  metabolism  disorders.  In  1992, S.R.  One,  an  affiliate  of SmithKline
Beecham, purchased $2.0 million  of the Company's  Preferred Stock. In  November
1993,  at the time NPS entered into the SmithKline Agreement, S.R. One purchased
an additional  $7.0 million  of Preferred  Stock, and  it acquired  $495,000  of
Common  Stock  (90,000 shares)  in the  Company's  initial public  offering. The
869,049 shares of Preferred Stock purchased by S.R. One converted into 1,701,301
shares of Common Stock upon the closing of the Company's initial public offering
in May 1994. SmithKline  Beecham has paid  license fees of  $6.0 million to  the
Company  under the SmithKline  Agreement and may be  required to make additional
payments upon the occurrence  of certain milestones (of  which $3.0 million  was
paid  to NPS in January  1996). In addition, SmithKline  Beecham is scheduled to
fund all clinical development  under the SmithKline  Agreement, has dedicated  a
scientific  team  to the  program,  and since  July  1, 1995  has  supported the
Company's research efforts in  osteoporosis and will continue  to do so  through
the scheduled expiration of the research term in October 1996, if not previously
terminated.  SmithKline Beecham is required to pay NPS royalties on sales of any
products for treating osteoporosis and other bone metabolism disorders developed
under the  SmithKline Agreement.  See "Business  -- Collaborative  Research  and
License Agreements."
 
    Dr.  Kuhla,  a director  of the  Company  since 1991,  is Vice  President of
Plexus. The Company had a consulting agreement with Plexus through December  31,
1995,  whereunder Plexus  assisted the  Company with  its effort  to establish a
collaboration for Norcalcin in Europe. During the years ended December 31,  1994
and  1995,  the  Company  paid  fees to  Plexus  totaling  $34,000  and $84,500,
respectively. Plexus will earn an additional  fee as payments are received  from
Amgen.  Under  the agreement  the maximum  additional fee  is $500,000,  but the
Company and Plexus have agreed to negotiate in good faith for an increase in the
maximum because of the non-European territory licensed to Amgen.
 
    Mr. Groninger  is  a brother-in-law  of  Dr. Jackson,  the  Company's  Chief
Executive Officer, President and Chairman of the Board.
 
                                       46
<PAGE>
EXECUTIVE COMPENSATION
 
    The  following table  shows for  the fiscal  years ended  December 31, 1995,
December 31, 1994 and  December 31, 1993, certain  compensation awarded or  paid
to,  or earned by, the Company's Chief Executive Officer and its other four most
highly compensated executive officers (the "Named Executive Officers"):
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                        CASH COMPENSATION            LONG-TERM
                                                                                                COMPENSATION AWARDS
                                                                      ---------------------  -------------------------
                    NAME AND PRINCIPAL POSITION                         YEAR     SALARY($)   STOCK OPTIONS GRANTED(#)
- - --------------------------------------------------------------------  ---------  ----------  -------------------------
<S>                                                                   <C>        <C>         <C>
Hunter Jackson, Ph.D................................................       1995     189,033             45,000
  Chief Executive Officer, President and                                   1994     180,000             45,000
  Chairman of the Board                                                    1993     145,511             75,000
James U. Jensen, J.D................................................       1995     147,072             25,000
  Vice President, Corporate Development and                                1994     140,000             15,000
  Legal Affairs and Secretary                                              1993     125,000             18,000
Thomas B. Marriott, Ph.D............................................       1995     157,629             25,000
  Vice President, Development Research                                     1994     150,000             30,000
                                                                           1993      86,923             63,000
Robert K. Merrell...................................................       1995     110,422             20,000
  Vice President, Finance, Chief Financial                                 1994     105,000             15,000
  Officer and Treasurer                                                    1993      93,000             15,000
Edward F. Nemeth, Ph.D..............................................       1995     136,603             30,000
  Vice President, Research                                                 1994     130,000             30,000
                                                                           1993      98,000             45,000
</TABLE>
 
1987 STOCK OPTION PLAN
 
   
    The 1987 Stock Option Plan (the "1987  Plan") was adopted in June 1987.  The
purposes  of the 1987  Plan were to  attract and retain  qualified personnel, to
provide additional incentives  to employees, officers,  advisors, directors  and
consultants of the Company and to promote the success of the Company's business.
No  options have been granted  under the 1987 Plan  since December 1993, and the
Company will not make  any future grants  under the 1987 Plan.  As of March  31,
1996,  options to purchase  a total of  535,493 shares of  Common Stock had been
exercised for  cash and  services under  the  1987 Plan  at a  weighted  average
exercise  price of $0.64 per share. As of  March 31, 1996, options to purchase a
total of 782,604 shares of Common  Stock were outstanding, with exercise  prices
ranging  from $0.34 to $4.00 per share and a weighted average exercise price per
share of $1.30.
    
 
    Options granted under the 1987 Plan  generally became exercisable at a  rate
of one-third of the shares subject to the option on the first anniversary of the
option grant and one-third of the remaining shares subject to the option on each
of  the second and third anniversary of the  option grant. The maximum term of a
stock option under the 1987 Plan was  10 years; however, if the optionee at  the
time  of grant had voting power over  more than 10% of the Company's outstanding
capital stock (a "10% Holder"), the  maximum term of any incentive stock  option
granted  under the 1987 Plan was five  years. The aggregate fair market value of
the stock with respect to which incentive stock options are exercisable for  the
first  time by  an optionee in  any calendar  year may not  exceed $100,000. The
exercise prices of incentive stock options  granted under the 1987 Plan were  at
least  equal to 100%, 110% with respect to 10% Holders, of the fair market value
of the stock subject  to the option  on the date of  grant. Although no  minimum
exercise  price of non-qualified stock options was required under the 1987 Plan,
the exercise price of non-qualified  stock options previously granted under  the
1987 Plan generally has been at least
 
                                       47
<PAGE>
equal to the fair market value of the stock subject to the option on the date of
the grant. Any option that is exercisable at the time of grant and which expires
no  sooner than three years from the grant date is subject to an option exercise
price equal to the fair market value of the option on the grant date.
 
1994 EQUITY INCENTIVE PLAN
 
   
    In January 1994, the Board adopted the 1994 Equity Incentive Plan (the "1994
Plan"), which was subsequently  approved by the  stockholders in February  1994,
and  an amendment to increase the number of shares available for grant under the
1994 Plan from 442,503 shares to 942,503 shares was approved by the stockholders
in May 1995. A  total of 942,503  shares of Common Stock  has been reserved  for
issuance  under the 1994 Plan. The purposes of  the 1994 Plan are to attract and
retain qualified  personnel,  to  provide additional  incentives  to  employees,
officers,  directors and  consultants of the  Company and its  affiliates and to
promote the success of the Company's business. Under the 1994 Plan, the  Company
may  grant  non-qualified stock  options to  employees, officers,  directors and
consultants to the  Company and  its affiliates  and may  grant incentive  stock
options  to employees of the  Company and its affiliates.  As of March 31, 1996,
options to purchase a total of 19,873 shares of Common Stock had been  exercised
for  cash and services under the 1994  Plan at a weighted average exercise price
of $13.85 per share. As of March 31, 1996, options to purchase 622,727 shares of
Common Stock with exercise prices ranging from $3.00 to $14.50 per share, and  a
weighted average exercise price per share of $5.61, were outstanding.
    
 
    Options  granted under the 1994 Plan  generally become exercisable at a rate
of 28% of the shares subject to the option  at the end of the first year and  3%
of  the  shares  subject  to  the  option at  the  end  of  each  calendar month
thereafter. The maximum term of a stock option under the 1994 Plan is 10  years;
however, if the optionee who is granted an incentive stock option at the time of
grant  is a 10% Holder,  the maximum term of  any incentive stock option granted
under the 1994 Plan is five years. If an optionee terminates his or her  service
to  the Company, the optionee may exercise only those option shares vested as of
the date of  termination and must  effect such exercise  within three months  of
termination  of service for any reason other  than death or disability, one year
after termination due  to disability,  and 18  months after  termination due  to
death.  The aggregate  fair market value  with respect to  which incentive stock
options are exercisable for the first time  by an optionee in any calendar  year
may  not exceed $100,000. The exercise  price of incentive stock options granted
under the 1994 Plan must be at least 100%, 110% with respect to 10% Holders,  of
the  fair market value of the Common Stock  of the Company on the date of grant.
Upon completion of this Offering, no employee will be a 10% Holder. The exercise
price of non-qualified  stock options granted  under the 1994  Plan is the  fair
market  value of the Company's  Common Stock on the date  of grant or such other
exercise price as  is set  by the Board  at the  date of grant.  Payment of  the
exercise  price may be made  in cash or by shares  of the Company's Common Stock
valued at the fair market value of such shares on the date of exercise or in any
other form acceptable to  the Board. The  1994 Plan also  allows the Company  to
grant  stock bonuses,  reload options, rights  to purchase  restricted stock and
stock appreciation rights.
 
    The 1994 Plan  may be amended  at any  time by the  Board, although  certain
amendments require stockholder approval. The 1994 Plan will terminate in January
2004, unless earlier terminated by the Board.
 
                                       48
<PAGE>
    The  following table  sets forth  each grant  of options  to purchase Common
Stock made  during  the year  ended  December 31,  1995  to each  of  the  Named
Executive  Officers. Grants of  options to each of  the Named Executive Officers
were made under the 1994 Plan:
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                               POTENTIAL REALIZABLE
                                                     % OF TOTAL                                  VALUE AT ASSUMED
                                        NUMBER OF      OPTIONS                                ANNUAL RATES OF STOCK
                                       SECURITIES    GRANTED TO    EXERCISE OR                PRICE APPRECIATION FOR
                                       UNDERLYING     EMPLOYEES    BASE PRICE                   OPTION TERM($)(4)
                                         OPTIONS      IN FISCAL     PER SHARE    EXPIRATION   ----------------------
                NAME                  GRANTED(#)(1)    YEAR(2)       ($/SH)        DATE(3)        5%         10%
- - ------------------------------------  -------------  -----------  -------------  -----------  ----------  ----------
<S>                                   <C>            <C>          <C>            <C>          <C>         <C>
Hunter Jackson......................       45,000         12.03%    $    8.25      12/14/05   $  233,477  $  591,677
James U. Jensen.....................       25,000          6.68          8.25      12/14/05      129,710     328,709
Thomas B. Marriott..................       25,000          6.68          8.25      12/14/05      129,710     328,709
Robert K. Merrell...................       20,000          5.35          8.25      12/14/05      103,768     262,968
Edward F. Nemeth....................       30,000          8.02          8.25      12/14/05      155,651     394,451
</TABLE>
 
- - --------------
(1) Options granted under the 1994 Plan become exercisable at the rate of 28% of
    the shares subject to the option one year after the date of grant and 3%  of
    the shares subject to the option each month thereafter.
 
(2) Based  on an  aggregate of  374,000 options granted  under the  1994 Plan to
    employees of the Company, including the Named Executive Officers.
 
(3) These options  have a  10-year  term, subject  to earlier  termination  upon
    death, disability or termination of employment.
 
(4) The potential realizable value is calculated based on the term of the option
    at its time of grant (10 years). It is calculated by assuming that the stock
    price  on  the  date  of  grant appreciates  at  the  indicated  annual rate
    compounded annually for the entire term of the option and that the option is
    exercised and sold on  the last day  of its term  for the appreciated  stock
    price.  No gain to the optionee is possible unless the stock price increases
    over the option term, which will benefit all stockholders.
 
    The following table sets forth information with respect to (i) the  exercise
of  stock options by the  Named Executive Officers during  the fiscal year ended
December 31, 1995;  (ii) the  number of unexercised  options held  by the  Named
Executive  Officers as of December 31, 1995;  and (iii) the value as of December
31, 1995 of unexercised in-the-money options.
 
               OPTION EXERCISES IN 1995 AND YEAR-END VALUE TABLE
 
<TABLE>
<CAPTION>
                                                                    NUMBER OF SECURITIES     VALUE OF UNEXERCISED
                                                                   UNDERLYING UNEXERCISED        IN-THE-MONEY
                                                                         OPTIONS(#)             OPTIONS($)(2)
                                 SHARES ACQUIRED   VALUE REALIZED       EXERCISABLE/             EXERCISABLE/
             NAME                ON EXERCISE(#)        ($)(1)           UNEXERCISABLE           UNEXERCISABLE
- - ------------------------------  -----------------  --------------  -----------------------  ----------------------
<S>                             <C>                <C>             <C>                      <C>
Hunter Jackson................         67,800        $  494,478          107,600/102,400    $  1,681,850/1,247,950
James U. Jensen...............         64,400           157,477            28,700/41,800           449,225/470,400
Thomas B. Marriott............          3,000            16,155            47,400/67,600           748,470/871,950
Robert K. Merrell.............         18,643           113,758            69,057/35,800         1,119,779/410,510
Edward F. Nemeth..............         30,000            88,650            83,400/66,600         1,320,150/806,550
</TABLE>
 
- - --------------
(1) Value realized is  based on the  fair market value  of the Company's  Common
    Stock  on the  date of  exercise (the  closing sales  price reported  on the
    Nasdaq National Market on such date) minus the exercise price, and does  not
    necessarily indicate that the optionee sold such stock.
 
(2) Represents  the difference between the option exercise price and the closing
    price of  the Company's  Common Stock  as reported  on the  Nasdaq  National
    Market  on  December 31,  1995 ($17.25)  times  the corresponding  number of
    shares.
 
                                       49
<PAGE>
EMPLOYEE STOCK PURCHASE PLAN
 
   
    In January 1994,  the Board adopted  the Employee Stock  Purchase Plan  (the
"Purchase  Plan"),  which  was  subsequently  approved  by  the  stockholders in
February 1994.  The  Purchase Plan  provides  a  means by  which  employees  may
purchase  Common Stock of  the Company through  payroll deductions. The Purchase
Plan is implemented  by offerings  of rights to  eligible employees.  Generally,
each  offering  is of  24 months'  duration with  purchases occurring  every six
months. Common Stock is purchased for accounts of employees participating in the
Purchase Plan at a  price per share equal  to the lower of  (i) 85% of the  fair
market  value  of  a  share of  Common  Stock  on the  date  of  commencement of
participation in the offering, or (ii) 85%  of the fair market value of a  share
of  Common Stock  on the date  of purchase. Generally,  all employees, including
executive officers, who  work at  least 20 hours  per week  and are  customarily
employed  by the Company or an affiliate of the Company for at least five months
per calendar year may participate in the Purchase Plan and may authorize payroll
deductions of up to 15%  of their base compensation  for the purchase of  Common
Stock under the Purchase Plan. A total of 90,000 shares of Common Stock has been
reserved  for issuance under the Purchase Plan. As of March 31, 1996, a total of
51,362 shares of  Common Stock  had been purchased  under the  Purchase Plan  at
prices  from $2.76 to $5.42 per Share with a weighted average price of $3.20 per
share. The Purchase Plan will terminate in January 2004.
    
 
401(K) PLAN
 
    In October 1990, the Company adopted the Employee 401(k) Profit Sharing Plan
(the "401(k) Plan")  covering all of  the Company's employees.  Pursuant to  the
401(k)  Plan, employees may elect to reduce  their current compensation by up to
the lesser of 15% of eligible compensation or the statutorily prescribed  annual
limit  ($9,500 in 1996) and have the amount of such reduction contributed to the
401(k) Plan. The 401(k) Plan permits, but does not require, additional  matching
contributions  to the 401(k) Plan by the  Company on behalf of all participants.
The Company has  not made any  such contributions  to date. The  401(k) Plan  is
intended  to qualify  under Section  401 of  the Code  so that  contributions by
employees or  by the  Company to  the 401(k)  Plan, and  income earned  on  plan
contributions,  are not taxable to  employees until withdrawn, and contributions
by the Company, if any, will be deductible by the Company when made.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS
 
    The Company's Bylaws provide that the Company shall indemnify its  directors
and  officers and may  indemnify its employees  and other agents  to the fullest
extent permitted by Delaware law.  The Company has entered into  indemnification
contracts  with  its  directors and  officers  and has  purchased  directors and
officers' insurance.
 
    In addition, the  Company's Certificate of  Incorporation provides that  the
Company's  directors will not be  liable for monetary damages  for breach of the
directors' fiduciary duty  of care  to the  Company and  its stockholders.  This
provision  in the  Certificate of Incorporation  does not eliminate  the duty of
care, and in appropriate circumstances equitable remedies such as an  injunction
or other forms of non-monetary relief would remain available under Delaware law.
Each  director  will continue  to  be subject  to  liability for  breach  of the
director's duty of loyalty  to the Company,  for acts or  omissions not in  good
faith  or involving intentional misconduct or knowing violations of law, for any
transaction from which the director derived an improper personal benefit and for
payment of dividends or  approval of stock repurchases  or redemptions that  are
unlawful  under Delaware law.  This provision also does  not affect a director's
responsibilities under any other  laws, such as the  federal securities laws  or
state or federal environmental laws.
 
                                       50
<PAGE>
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
    Dr.  Kuhla, a  director of  the Company,  is a  Vice President  of Plexus, a
consulting firm,  which assisted  the Company  with its  effort to  establish  a
collaboration for Norcalcin in Europe. See "Management -- Compensation Committee
Interlocks and Insider Participation."
 
    James  U. Jensen  is currently "of  counsel" to  the law firm  of Woodbury &
Kesler, P.C. which provided legal services to the Company during the last fiscal
year. The  dollar amount  of fees  paid to  that law  firm did  not exceed  five
percent of the law firm's gross revenues for its last full fiscal year.
 
    S.R.  One,  an affiliate  of  SmithKline Beecham,  is  a stockholder  of the
Company and has entered  into various stockholder  agreements with the  Company.
See "Management -- Compensation Committee Interlocks and Insider Participation."
 
    In  May 1994, BIL and Domain Partners  II, L.P. purchased 50,000 and 180,000
shares of Common Stock, respectively. Dr. Treu, a director of the Company  since
1992,  is  a general  partner of  Domain  Associates which  is the  U.S. venture
capital advisor to  BIL pursuant  to a contractual  arrangement. Dr.  Treu is  a
general  partner of One Palmer Square Associates  II, L.P., which is the general
partner of Domain Partners II, L.P.
 
                                       51
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
   
    The  following table sets forth  certain information regarding the ownership
of the Company's Common Stock  as of March 31, 1996  as adjusted to reflect  the
sale  of the 3,000,000 shares of Common  Stock being offered hereby (assuming no
exercise of  the Underwriters'  over-allotment option),  by (i)  each person  or
entity  who is  known by  the Company to  own beneficially  more than  5% of the
Company's Common Stock, (ii)  each director and Named  Executive Officer of  the
Company,  and (iii)  all directors  and executive officers  of the  Company as a
group.
    
 
   
<TABLE>
<CAPTION>
                                                                                                 PERCENT BENEFICIALLY
                                                                                  NUMBER OF            OWNED(2)
                                                                                   SHARES     --------------------------
                                                                                 BENEFICIALLY   PRIOR TO       AFTER
BENEFICIAL OWNER (1)                                                              OWNED(2)      OFFERING      OFFERING
- - -------------------------------------------------------------------------------  -----------  ------------  ------------
<S>                                                                              <C>          <C>           <C>
S. R. One, Limited (3) ........................................................   1,797,091        21.93%        16.05%
 Bay Colony Executive Park
 565 East Swedesford Road, Suite 315
 Wayne, PA 08542
Amgen Inc. ....................................................................   1,000,000        12.21          8.94
 1840 DeHavilland Drive
 Thousand Oaks, CA 91320-1789
State of Wisconsin Investment Board ...........................................     645,000         7.88          5.77
 P.O. Box 7842
 Madison, WI 53707
Biotechnology Investments Limited (4) .........................................     635,938         7.77          5.68
 P.O. Box 58
 St. Julian's Court
 St. Peter Port, Guernsey, Channel Islands
Domain Partners II, L.P. (5) ..................................................     575,938         7.03          5.15
 One Palmer Square
 Princeton, NJ 08542
Doug Reed, M.D. (6)............................................................   1,798,891        21.96         16.07
Jesse I. Treu, Ph.D. (7).......................................................     584,798         7.14          5.23
Hunter Jackson, Ph.D. (8)......................................................     509,528         6.14          4.51
Thomas N. Parks, Ph.D. (9).....................................................     355,090         4.33          3.17
James G. Groninger (10)........................................................     171,852         2.09          1.53
Edward F. Nemeth, Ph.D. (11)...................................................     121,856         1.47          1.08
James U. Jensen, J.D. (12).....................................................     111,369         1.35         *
Robert K. Merrell (13).........................................................      67,807        *             *
Thomas B. Marriott, Ph.D. (14).................................................      51,138        *             *
Donald E. Kuhla, Ph.D. (15)....................................................      36,840        *             *
Timothy J. Rink, M.D., Sc.D. (16)..............................................      36,640        *             *
Santo J. Costa, J.D. (17)......................................................       7,650        *             *
                                                                                  3,853,459        44.75         33.19
All directors and executive officers as a group (12 persons) (18)..............
</TABLE>
    
 
- - ------------------
* Less than 1 percent.
 
 (1) Except as set forth herein, the address  of the persons set forth above  is
     the address of the Company appearing elsewhere in this Prospectus.
 
 (2) This  table is based  upon information supplied  by officers, directors and
     principal stockholders and Schedules 13D and 13G filed with the  Securities
     and   Exchange  Commission  (the  "Commission").  Beneficial  ownership  is
     determined in accordance  with the  rules of the  Commission and  generally
     includes  voting or investment power with  respect to securities. Except as
     indicated by  footnotes  and  subject to  community  property  laws,  where
     applicable,  the persons named above have  sole voting and investment power
     with respect to all shares of  Common Stock shown as beneficially owned  by
     them. Beneficial ownership also includes shares of stock subject to options
     and warrants exercisable or convertible within 60 days.
 
   
 (3) Includes  5,790 shares  subject to  options exercisable  within 60  days of
     March 31, 1996 by Dr. Reed, who on  March 31, 1996 was a Vice President  of
     S.R.  One. Upon exercise,  such shares will  be transferred to  and held by
     S.R. One. Dr. Reed shares voting and
    
 
                                       52
<PAGE>
   
     investment power with the other officers  of S.R. One. Those officers  are:
     Peter  A.  Sears, President,  Brenda D.  Gavin,  Vice President,  Donald F.
     Parman, Vice President and Secretary, and William J. Shulby, Treasurer. Dr.
     Reed disclaims beneficial ownership of the shares held by S.R. One,  except
     to the extent of his pro rata interest therein. See footnote (6) below.
    
 
   
 (4) Excludes  shares subject to options exercisable within 60 days of March 31,
     1996 by Dr.  Treu, a  general partner of  Domain Associates,  which is  the
     United  States venture  capital advisor  to BIL  pursuant to  a contractual
     arrangement. Domain  Associates  has no  voting  or investment  power  over
     shares  owned  by BIL.  BIL disclaims  beneficial  ownership of  the shares
     issuable to Dr.  Treu upon  exercise of options.  BIL is  a publicly  held,
     Guernsey, Channel Islands corporation whose shares are traded on the London
     Stock  Exchange. The directors of BIL who share voting and investment power
     with respect to the shares  held by BIL are  as follows: Lord Armstrong  of
     Ilminster,  GCB, CVO (Chairman); Dr. John Bradfield, CBE (Deputy Chairman);
     Simon Chandler,  FCA; William  Lane, QC;  Air Chief  Marshal Sir  Peter  Le
     Cheminant,  GBE, KCB, DFC; Alan Le Page, FCIB; Geoffrey Robinson, ASCA; and
     Robert Sinclair, FCA. See footnotes (5) and (7) below.
    
 
   
 (5) Excludes (i) 2,790 shares subject to options exercisable within 60 days  of
     March  31,  1996  by Dr.  Treu,  a  general partner  of  One  Palmer Square
     Associates II, L.P. ("Palmer Square II"),  which is the general partner  of
     Domain  Partners II, L.P. ("Domain II")  and (ii) 1,250 shares beneficially
     owned by Palmer Square II. Domain II disclaims beneficial ownership of  the
     shares issuable to Dr. Treu upon exercise of options and of the shares held
     by  Palmer Square II. Dr. Treu shares  voting and investment power with the
     other general partners  of Palmer  Square II,  James C.  Blair, Richard  S.
     Schneider and Brian H. Dovey, with respect to the shares held by Domain II.
     See footnotes (4) and (7).
    
 
   
 (6) Includes  1,791,301 shares beneficially owned by S.R. One. Dr. Reed is Vice
     President of  S.R.  One. Also  includes  5,790 shares  subject  to  options
     exercisable  within 60 days  of March 31, 1996.  Upon exercise, such shares
     will be transferred  to, and  be held  by, S.R.  One. With  respect to  the
     shares  held by S.R. One, Dr. Reed  shares voting and investment power with
     the other officers of S.R. One. Dr. Reed disclaims beneficial ownership  of
     the shares held by S.R. One. On April 15, 1996, Dr. Reed became a full-time
     employee  and  Vice President,  Business  Development of  the  Company. See
     footnote (3) above.
    
 
   
 (7) Includes 575,938 shares beneficially  owned by Domain  II and 1,250  shares
     beneficially  owned by Palmer Square  II. Dr. Treu is  a general partner of
     Palmer Square II, which is the  general partner of Domain II. See  footnote
     (5)  above. Does not include the shares beneficially owned by BIL. Dr. Treu
     is a  general partner  of Domain  Associates, which  is the  United  States
     venture  capital  advisor to  BIL  pursuant to  a  contractual arrangement.
     Domain Associates has no voting or  investment power over the shares  owned
     by  BIL.  See footnote  (4) above.  Also includes  2,790 shares  subject to
     options exercisable within 60 days of March 31, 1996. Dr. Treu's address is
     the address of Domain II above.
    
 
   
 (8) Includes 75,000 shares held in a trust  and 2 shares held by Dr.  Jackson's
     children, of which he disclaims beneficial ownership. Also includes 106,350
     shares subject to options exercisable within 60 days of March 31, 1996.
    
 
   
 (9) Includes  5,790 shares  subject to  options exercisable  within 60  days of
     March 31, 1996.
    
 
   
(10) Includes 63,450  shares  held by  Mr.  Groninger's children,  of  which  he
     disclaims  beneficial  ownership. Also  includes  16,290 shares  subject to
     options exercisable within 60 days of March 31, 1996.
    
 
   
(11) Includes 87,900 shares  subject to  options exercisable within  60 days  of
     March 31, 1996.
    
 
   
(12) Includes 31,250 shares held by a trust. Also includes 30,950 shares subject
     to options exercisable within 60 days of March 31, 1996.
    
 
   
(13) Includes  64,307 shares  subject to options  exercisable within  60 days of
     March 31, 1996.
    
 
   
(14) Includes 41,297 shares  subject to  options exercisable within  60 days  of
     March 31, 1996.
    
 
   
(15) Includes  20,040 shares  subject to options  exercisable within  60 days of
     March 31, 1996.
    
 
   
(16) Includes 35,040 shares  subject to  options exercisable within  60 days  of
     March 31, 1996.
    
 
   
(17) Includes  6,450 shares  subject to  options exercisable  within 60  days of
     March 31, 1996.
    
 
   
(18) Includes an  aggregate of  422,994 shares  subject to  options  exercisable
     within 60 days of March 31, 1996. See footnotes (6) through (17) above.
    
 
                                       53
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
   
    The  Company's  Certificate of  Incorporation  provides that  the authorized
capital stock of  the Company is  20,000,000 shares of  Common Stock, $.001  par
value, and 5,000,000 shares of Preferred Stock, $.001 par value. Upon completion
of  the Offering,  11,187,232 shares  of Common  Stock (including  the shares of
Common  Stock  offered  hereby)  and  no  shares  of  Preferred  Stock  will  be
outstanding.  As  of March  31, 1996,  there were  approximately 160  holders of
record of the Company's Common Stock.
    
 
COMMON STOCK
 
    The holders of Common Stock are entitled to one vote for each share held  of
record  on all matters submitted  to a vote of  the stockholders. The holders of
Common Stock are not  entitled to cumulative voting  rights with respect to  the
election  of directors and, as a  consequence, minority stockholders will not be
able to  elect  directors  on  the  basis  of  their  votes  alone.  Subject  to
preferences  that may be applicable to  any then outstanding shares of Preferred
Stock, holders of Common Stock are entitled to receive ratably such dividends as
may be  declared by  the Board  out  of funds  legally available  therefor.  See
"Dividend  Policy." In the event of a  liquidation, dissolution or winding up of
the Company, holders of the  Common Stock are entitled  to share ratably in  all
assets  remaining after payment of liabilities and the liquidation preference of
any then outstanding Preferred Stock. Holders of Common Stock have no preemptive
rights and no  right to convert  their Common Stock  into any other  securities.
There  are no  redemption or  sinking fund  provisions applicable  to the Common
Stock. All outstanding  shares of  Common Stock are,  and all  shares of  Common
Stock  to be outstanding upon completion of the Offering will be, fully paid and
nonassessable.
 
PREFERRED STOCK
 
    The Board has the authority, without further action by the stockholders,  to
issue up to 5,000,000 shares of Preferred Stock in one or more series and to fix
the rights, preferences, privileges and restrictions thereof, including dividend
rights,  conversion  rights,  voting rights,  terms  of  redemption, liquidation
preferences, sinking fund terms and the number of shares constituting any series
or the  designation  of such  series.  The  issuance of  Preferred  Stock  could
adversely  affect the voting power of holders of Common Stock and the likelihood
that such holders will receive  dividend payments and payments upon  liquidation
and  could have  the effect  of delaying,  deferring or  preventing a  change in
control of the Company. The Company has  no present plan to issue any shares  of
Preferred Stock.
 
REGISTRATION RIGHTS
 
    Pursuant  to  agreements  with  the  Company,  holders  of  an  aggregate of
2,097,239 outstanding  shares of  Common Stock  (the "Registrable  Shares")  are
entitled  to certain  registration rights ("Registration  Rights"). Such holders
may, subject to certain  limitations, require the Company  to register at  least
20%  of their Registrable Shares for public  resale at the Company's expense. In
addition, these  holders have  the right  to include  their Registrable  Shares,
subject to certain limitations, in any registration of shares of Common Stock by
the  Company under  the Securities  Act. These  holders also  have the  right to
request up to two registrations on Form S-3 in any 12-month period. The  Company
is  required  to  bear  all  registration  expenses,  other  than  underwriters'
discounts and commissions, for all  Company-initiated registrations and for  the
first registration on Form S-3.
 
    The Company has filed a registration statement on Form S-3 for the resale of
the 1,000,000 shares of Common Stock sold to Amgen (the "Amgen Shares") pursuant
to  its obligations under the related  stock purchase agreement. The Company has
agreed to keep the registration statement effective for a period of three  years
or  until all such shares are sold. Amgen also has the right, subject to certain
limitations, to include such shares in  any registration of Common Stock by  the
Company  under  the  Securities  Act.  The  Company  is  required  to  bear  all
registration  expenses  with   respect  to   the  registration   of  the   Amgen
 
                                       54
<PAGE>
Shares on Form S-3 and is required to bear all registration expenses, other than
underwriters'   discounts   and  commissions,   with   respect  to   any  future
Company-initiated registration in which Amgen may have the right to include  its
shares. Amgen has waived its registration rights with respect to this Offering.
 
    In  addition, the holder  of a warrant  to purchase 32,542  shares of Common
Stock is entitled  to include such  shares in any  registration effected by  the
Company  under  the  Securities  Act  which  is  initiated  by  the  holders  of
Registrable Shares, but only  to the extent the  inclusion of such shares  would
not reduce the number of Registrable Shares to be included in such registration.
The  holder of  such warrant  to purchase  Registrable Shares  is also entitled,
subject to certain limitations,  to participate in  a registration initiated  by
the Company.
 
    The  holders of  Registrable Shares  and the  warrantholder have  waived all
registration rights with respect to this Offering.
 
WARRANT
 
    The Company  has issued  to  an equipment  financing  company a  warrant  to
purchase  32,542 shares of Common Stock at  $3.69 per share. The warrant expires
in June 2002.
 
DELAWARE ANTI-TAKEOVER LAW
 
    The Company is  subject to  the provisions of  Section 203  of the  Delaware
General Corporation Law, an anti-takeover law. In general, the statute prohibits
a  publicly held Delaware corporation from  engaging in a "business combination"
with an "interested stockholder" for a period  of three years after the date  of
the transaction in which the person became an interested stockholder, unless the
business combination is approved in a prescribed manner. For purposes of Section
203, a "business combination" includes a merger, asset sale or other transaction
resulting  in  a  financial  benefit  to  the  interested  stockholder,  and  an
"interested  stockholder"  is  a  person  who,  together  with  affiliates   and
associates,  owns (or  within three  years prior,  did own)  15% or  more of the
corporation's voting stock.
 
TRANSFER AGENT AND REGISTRAR
 
    The transfer agent and registrar for the Company's Common Stock is  American
Securities Transfer, Incorporated.
 
                                       55
<PAGE>
                                  UNDERWRITING
 
    Subject  to  the terms  and conditions  of  the Underwriting  Agreement, the
underwriters (the  "Underwriters")  named  below,  for  whom  Vector  Securities
International,  Inc., Salomon Brothers Inc and  UBS Securities LLC are acting as
representatives (the  "Representatives"),  have severally  agreed  to  purchase,
subject  to  the terms  and conditions  of the  Underwriting Agreement,  and the
Company has agreed to sell to the Underwriters, the following respective  number
of shares of Common Stock.
 
   
<TABLE>
<CAPTION>
UNDERWRITERS                                                                           NUMBER OF SHARES
- - -------------------------------------------------------------------------------------  -----------------
<S>                                                                                    <C>
Vector Securities International, Inc.................................................         589,000
Salomon Brothers Inc.................................................................         588,000
UBS Securities LLC...................................................................         588,000
Bear, Stearns & Co. Inc..............................................................          65,000
Alex. Brown & Sons Incorporated......................................................          65,000
CS First Boston Corporation..........................................................          65,000
Donaldson, Lufkin & Jenrette Securities Corporation..................................          65,000
A.G. Edwards & Sons, Inc.............................................................          65,000
Lehman Brothers Inc..................................................................          65,000
Merrill Lynch, Pierce, Fenner & Smith Incorporated...................................          65,000
Montgomery Securities................................................................          65,000
Morgan Stanley & Co. Incorporated....................................................          65,000
Oppenheimer & Co., Inc...............................................................          65,000
Prudential Securities Incorporated...................................................          65,000
Allen & Company Incorporated.........................................................          65,000
Cowen & Company......................................................................          35,000
Crowell, Weedon & Co.................................................................          35,000
Duff & Phelps, Inc...................................................................          35,000
Jefferies & Company, Inc.............................................................          35,000
Ladenburg, Thalmann & Co. Inc........................................................          35,000
McDonald & Company Securities, Inc...................................................          35,000
Needham & Company, Inc...............................................................          35,000
Rauscher Pierce Refsnes, Inc.........................................................          35,000
Raymond James & Associates, Inc......................................................          35,000
Starr Securities, Inc................................................................          35,000
Sutro & Co. Incorporated.............................................................          35,000
Van Kasper & Company.................................................................          35,000
Yamaichi International (America), Inc................................................          35,000
                                                                                             --------
  Total..............................................................................       3,000,000
                                                                                             --------
                                                                                             --------
</TABLE>
    
 
    The Underwriting Agreement provides that the obligations of the Underwriters
are  subject  to  certain conditions  precedent,  including the  absence  of any
material adverse change  in the Company's  business and the  receipt of  certain
certificates,  opinions and letters from the Company and its counsel. The nature
of the Underwriters' obligation is such that they are committed to purchase  all
shares of Common Stock offered hereby if any of such shares are purchased.
 
   
    The Underwriters propose to offer the shares of Common Stock directly to the
public  at  the  public offering  price  set forth  on  the cover  page  of this
Prospectus, and to certain dealers at such price less a concession not in excess
of $.58 per share. The Underwriters may  allow, and such dealers may reallow,  a
concession  not in excess of $.10 per  share to certain other dealers. After the
public offering of  the shares  of Common Stock,  the offering  price and  other
selling terms may be changed by the Representatives.
    
 
    The  Company has granted  to the Underwriters an  option, exercisable at any
time during the 30-day period after the date of this Prospectus, to purchase  up
to an additional 450,000 shares of Common Stock at the public offering price set
forth  on the  cover page  of this  Prospectus, less  underwriting discounts and
 
                                       56
<PAGE>
commissions. The Underwriters may exercise such option solely for the purpose of
covering over-allotments, if any, in connection with the Offering. To the extent
such option is exercised, each Underwriter will be obligated, subject to certain
conditions, to purchase  approximately the  same percentage  of such  additional
shares  as  the  number  of  shares  of Common  Stock  set  forth  next  to such
Underwriter's name in the  preceding table bears to  the total number of  shares
listed in the table.
 
    The  offering of the shares is made for delivery when, as and if accepted by
the Underwriters and subject  to prior sale and  to withdrawal, cancellation  or
modification of this Offering without notice. The Underwriters reserve the right
to reject an order for the purchase of shares in whole or in part.
 
    The  Company  has  agreed  to  indemnify  the  Underwriters  against certain
liabilities, including liabilities under the  Securities Act, and to  contribute
to payments the Underwriters may be required to make in respect thereof.
 
    The  executive  officers, directors  and certain  other stockholders  of the
Company have agreed  that they will  not, without the  prior written consent  of
Vector  Securities International, Inc., offer, sell  or otherwise dispose of any
shares of Common Stock, options or warrants to acquire shares of Common Stock or
securities exchangeable for or convertible into shares of Common Stock owned  by
them  for a period of 90 days after the date of this Prospectus. The Company has
agreed that it will not, without the prior written consent of Vector  Securities
International,  Inc., offer, sell  or otherwise dispose of  any shares of Common
Stock, options  or warrants  to acquire  shares of  Common Stock  or  securities
exchangeable  for or convertible into shares of  Common Stock for a period of 90
days after  the date  of this  Prospectus,  except that  the Company  may  grant
additional  options  under its  stock  option plans,  or  issue shares  upon the
exercise of outstanding stock options or warrants.
 
    In connection with  this Offering,  certain Underwriters  and selling  group
members  (if  any) who  are qualifying  registered market  makers on  the Nasdaq
National Market may engage in  passive market-making transactions in the  Common
Stock  on the Nasdaq  National Market in  accordance with Rule  10b-6A under the
Securities Exchange  Act of  1934  during the  two  business day  period  before
commencement  of sales in this Offering.  The passive market making transactions
must comply with applicable volume and  price limits and be identified as  such.
In  general, a passive market maker may display its bid at a price not in excess
of the highest  independent bid for  the security. If  all independent bids  are
lowered  below the passive  market maker's bid,  however, such bid  must then be
lowered when certain purchase  limits are exceeded. Net  purchases by a  passive
market  maker on each day are generally limited to a specified percentage of the
passive market making average daily trading volume in the Common Stock during  a
price period and must be discontinued when such limit is reached. Passive market
making  may stabilize the market price of the Common Stock at a level above that
which might otherwise  prevail, and, if  commenced, may be  discontinued at  any
time.
 
                                       57
<PAGE>
                                 LEGAL MATTERS
 
    The  validity of the  shares of Common  Stock offered hereby  will be passed
upon for the Company by Pillsbury Madison  & Sutro LLP, San Francisco and  Menlo
Park, California. Certain legal matters in connection with the sale of shares of
Common  Stock  in this  Offering will  be  passed upon  for the  Underwriters by
Skadden, Arps, Slate, Meagher & Flom, Chicago, Illinois.
 
                                    EXPERTS
 
    The financial statements of NPS, a development stage company, as of December
31, 1994 and 1995,  and for each  of the years in  the three-year period  ending
December  31, 1995, and for the period from October 22, 1986 (inception) through
December 31, 1995, included herein and elsewhere in the Registration  Statement,
have been included herein and in the Registration Statement in reliance upon the
report  of  KPMG Peat  Marwick  LLP, independent  certified  public accountants,
appearing elsewhere herein, and  upon the authority of  said firm as experts  in
accounting and auditing.
 
    The  statements  in  this Prospectus  under  the captions  "Risk  Factors --
Uncertainty of Protection of Patents  and Proprietary Technology" and  "Business
- - --  Patents and Proprietary  Technology," insofar as  they constitute matters of
patent law, have been reviewed by Lyon & Lyon, and are subject to an opinion  to
be rendered to the Underwriters.
 
                             ADDITIONAL INFORMATION
 
    The  Company has filed with the  Commission a Registration Statement on Form
S-1 under the Securities Act with respect to the shares of Common Stock  offered
hereby. This Prospectus does not contain all of the information set forth in the
Registration  Statement  and the  exhibits  and schedules  thereto.  For further
information with respect  to the Company  and the Common  Stock offered  hereby,
reference  is  made  to such  Registration  Statement  and to  the  exhibits and
schedules filed therewith.  Statements contained  in this Prospectus  as to  the
contents  of  any contract  or other  document referred  to are  not necessarily
complete and in each instance reference is made to the copy of such contract  or
other   document  filed  as  an  exhibit  to  the  Registration  Statement.  The
Registration Statement, together with the exhibits and schedules thereto, may be
inspected without charge at the offices  of the Commission at 450 Fifth  Street,
N.W.,  Washington,  DC 20549  or at  its  regional offices  located at  500 West
Madison Street, Chicago, Illinois 60661 and 14th Floor, 75 Park Place, New York,
New York  10007.  Copies  of such  material  may  be obtained  from  the  Public
Reference  Section of the  Commission at 450 Fifth  Street, N.W., Washington, DC
20549 at prescribed rates.
 
    The Company is subject to the information requirements of the Securities and
Exchange Act of  1934, as amended,  and in accordance  therewith files  reports,
proxy  statements and other information with the Commission. Such reports, proxy
statements and  other information  can be  inspected and  copied at  the  Public
Reference  Section  of the  Commission  at Room  1024,  450 Fifth  Street, N.W.,
Washington, DC 20549; and at  the Commission's regional offices at  Northwestern
Atrium  Center, Suite 1400, 500 West Madison Street, Chicago, Illinois 60661 and
14th Floor, 75 Park Place, New York, New York 10007. Copies of such material can
be obtained from  the Public Reference  Section of the  Commission at 450  Fifth
Street,  N.W., Washington,  DC 20549 at  prescribed rates.  The Company's Common
Stock is  quoted  on  the  Nasdaq  National  Market,  and  such  reports,  proxy
statements, and other information concerning the Company can be inspected at the
Public  Reference Section of the Nasdaq National  Market at 1735 K Street, N.W.,
Washington, D.C. 20006.
 
                                       58
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<S>                                                                                     <C>
Report of KPMG Peat Marwick LLP, Independent Auditors.................................        F-2
Balance Sheets........................................................................        F-3
Statements of Operations..............................................................        F-4
Statements of Stockholders' Equity....................................................        F-5
Statements of Cash Flows..............................................................        F-8
Notes to Financial Statements.........................................................       F-10
</TABLE>
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors
NPS Pharmaceuticals, Inc.:
 
    We have audited the accompanying balance sheets of NPS Pharmaceuticals, Inc.
(a  development stage company) as of December 31, 1994 and 1995, and the related
statements of operations, stockholders' equity, and  cash flows for each of  the
years  in the three-year period ended December 31, 1995, and for the period from
October  22,  1986  (inception)  through  December  31,  1995.  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 financial position of NPS Pharmaceuticals, Inc. (a
development stage company) as of December 31, 1994 and 1995, and the results  of
its operations and its cash flows for each of the years in the three-year period
ended  December 31, 1995, and  for the period from  October 22, 1986 (inception)
through December  31, 1995,  in conformity  with generally  accepted  accounting
principles.
 
                                          KPMG PEAT MARWICK LLP
 
Salt Lake City, Utah
February 7, 1996, except as to note 11
which is as of March 18, 1996
 
                                      F-2
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                                 BALANCE SHEETS
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                                       PRO FORMA
                                                                               DECEMBER 31,            (NOTE 11)
                                                                       ----------------------------  DECEMBER 31,
                                                                           1994           1995           1995
                                                                       -------------  -------------  -------------
<S>                                                                    <C>            <C>            <C>
Current assets:
  Cash and cash equivalents..........................................  $   5,931,082  $   8,039,625   $25,539,625
  Marketable investment securities (note 2)..........................      3,392,135        300,000       300,000
  Accounts receivable................................................        260,000         23,000        23,000
                                                                       -------------  -------------  -------------
    Total current assets.............................................      9,583,217      8,362,625    25,862,625
                                                                       -------------  -------------  -------------
Plant and equipment (note 4):
  Equipment..........................................................      2,039,441      2,272,006     2,272,006
  Leasehold improvements.............................................      1,603,424      1,635,189     1,635,189
                                                                       -------------  -------------  -------------
                                                                           3,642,865      3,907,195     3,907,195
  Less accumulated depreciation and amortization.....................      1,209,298      1,711,551     1,711,551
                                                                       -------------  -------------  -------------
    Net plant and equipment..........................................      2,433,567      2,195,644     2,195,644
Other assets, at cost................................................         67,028         42,154        42,154
                                                                       -------------  -------------  -------------
                                                                       $  12,083,812  $  10,600,423   $28,100,423
                                                                       -------------  -------------  -------------
                                                                       -------------  -------------  -------------
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Current installments of obligation under capital leases (note 4)...  $     413,001  $     435,230   $   435,230
  Current installments on long-term debt (note 5)....................             --        331,746       331,746
  Accounts payable...................................................        924,480      1,036,464     1,036,464
  Accrued expenses...................................................        141,511        139,714       139,714
  Deferred income....................................................             --        587,500       587,500
  Income tax payable (note 7)........................................             --             --       160,000
                                                                       -------------  -------------  -------------
    Total current liabilities........................................      1,478,992      2,530,654     2,690,654
Obligations under capital leases, excluding current installments
 (note 4)............................................................        440,098         53,761        53,761
Long-term debt, excluding current installments (note 5)..............             --        693,528       693,528
                                                                       -------------  -------------  -------------
    Total liabilities................................................      1,919,090      3,277,943     3,437,943
                                                                       -------------  -------------  -------------
Commitments and contingencies (notes 3, 4, 9 and 12).................
Stockholders' equity (note 6):.......................................
  Preferred stock, $.001 par value; 5,000,000 shares authorized; no
   shares issued and outstanding.....................................             --             --            --
  Common Stock, $.001 par value; 20,000,000 shares authorized; issued
   and outstanding 6,787,358 shares at December 31, 1994, 7,072,801
   shares at December 31, 1995, and 8,072,801 shares pro forma.......          6,787          7,073         8,073
  Additional paid-in capital.........................................     27,847,067     28,067,130    35,566,130
  Deferred compensation..............................................       (489,958)      (234,458)     (234,458)
  Deficit accumulated during development stage.......................    (17,199,174)   (20,517,265)  (10,677,265)
                                                                       -------------  -------------  -------------
    Net stockholders' equity.........................................     10,164,722      7,322,480    24,662,480
                                                                       -------------  -------------  -------------
                                                                       $  12,083,812  $  10,600,423   $28,100,423
                                                                       -------------  -------------  -------------
                                                                       -------------  -------------  -------------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-3
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                                                   OCTOBER 22,
                                                                                                       1986
                                                                                                   (INCEPTION)
                                                                YEAR ENDED DECEMBER 31,              THROUGH
                                                       -----------------------------------------   DECEMBER 31,
                                                           1993          1994          1995            1995
                                                       ------------  ------------  -------------  --------------
<S>                                                    <C>           <C>           <C>            <C>
Revenues from research and license agreements........  $    867,568  $  3,860,706  $   9,562,319  $   22,315,849
Operating expenses:
  Research and development...........................     6,021,126     7,765,326      8,727,316      30,360,190
  General and administrative.........................     2,003,699     3,121,688      3,975,379      12,788,445
                                                       ------------  ------------  -------------  --------------
    Total operating expenses.........................     8,024,825    10,887,014     12,702,695      43,148,635
                                                       ------------  ------------  -------------  --------------
    Operating loss...................................    (7,157,257)   (7,026,308)    (3,140,376)    (20,832,786)
Other income (expense):
  Interest income....................................       110,314       398,388        480,029       1,256,844
  Interest expense...................................      (111,638)     (128,413)      (157,744)       (475,713)
  Other..............................................            --            --             --          34,390
                                                       ------------  ------------  -------------  --------------
    Total other income (expense).....................        (1,324)      269,975        322,285         815,521
                                                       ------------  ------------  -------------  --------------
    Loss before income tax expense...................    (7,158,581)   (6,756,333)    (2,818,091)    (20,017,265)
Income tax expense (note 7)..........................            --            --        500,000         500,000
                                                       ------------  ------------  -------------  --------------
Net loss.............................................  $ (7,158,581) $ (6,756,333) $  (3,318,091) $  (20,517,265)
                                                       ------------  ------------  -------------  --------------
                                                       ------------  ------------  -------------  --------------
Net loss per common share (note 1)...................  $      (1.91) $      (1.13) $        (.48)
                                                       ------------  ------------  -------------
                                                       ------------  ------------  -------------
Weighted average shares outstanding (note 1).........     3,751,000     5,977,300      6,924,400
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-4
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                       STATEMENTS OF STOCKHOLDERS' EQUITY
             OCTOBER 22, 1986 (INCEPTION) THROUGH DECEMBER 31, 1995
<TABLE>
<CAPTION>
                                                            SERIES A     SERIES B      SERIES C       SERIES D       SERIES E
                                                            PREFERRED    PREFERRED     PREFERRED      PREFERRED      PREFERRED
                                                              STOCK        STOCK         STOCK          STOCK          STOCK
                                                           -----------  -----------  -------------  -------------  -------------
<S>                                                        <C>          <C>          <C>            <C>            <C>
Issuance of 1,125,000 shares of common stock for cash and
 equipment valued at fair value upon incorporation at
 October 22, 1986........................................   $      --    $      --     $      --      $      --      $      --
Net loss.................................................          --           --            --             --             --
                                                           -----------  -----------          ---            ---            ---
Balances, December 31, 1986..............................          --           --            --             --             --
Repurchase of 375,000 shares of common stock.............          --           --            --             --             --
Issuance of 82,500 shares of common stock for services...          --           --            --             --             --
Net income...............................................          --           --            --             --             --
                                                           -----------  -----------          ---            ---            ---
Balances, December 31, 1987..............................          --           --            --             --             --
Issuance of 55,556 shares of preferred stock for cash....       5,556           --            --             --             --
Issuance of 11,448 shares of common stock for cash upon
 exercise of stock options...............................          --           --            --             --             --
Issuance of 97,500 shares of common stock for services...          --           --            --             --             --
Net loss.................................................          --           --            --             --             --
                                                           -----------  -----------          ---            ---            ---
Balances, December 31, 1988..............................       5,556           --            --             --             --
Issuance of 37,037 shares of preferred stock for cash....          --        3,704            --             --             --
Issuance of 7,500 shares of common stock for services....          --           --            --             --             --
Net loss.................................................          --           --            --             --             --
                                                           -----------  -----------          ---            ---            ---
Balances, December 31, 1989..............................       5,556        3,704            --             --             --
Issuance of 37,037 shares of preferred stock for cash....          --        3,703            --             --             --
Issuance of 2,475 shares of common stock for cash upon
 exercise of stock options...............................          --           --            --             --             --
Net loss.................................................          --           --            --             --             --
                                                           -----------  -----------          ---            ---            ---
Balances, December 31, 1990..............................       5,556        7,407            --             --             --
 
<CAPTION>
                                                                                                    DEFICIT
                                                                                                  ACCUMULATED
                                                                        ADDITIONAL    DEFERRED       DURING          NET
 
                                                             COMMON       PAID-IN      COMPEN-    DEVELOPMENT   STOCKHOLDERS'
 
                                                              STOCK       CAPITAL      SATION        STAGE         EQUITY
 
                                                           -----------  -----------  -----------  ------------  -------------
 
<S>                                                        <C>          <C>          <C>          <C>           <C>
Issuance of 1,125,000 shares of common stock for cash and
 equipment valued at fair value upon incorporation at
 October 22, 1986........................................   $   1,125    $  13,875    $      --    $       --    $    15,000
 
Net loss.................................................          --           --           --       (12,477)       (12,477)
 
                                                           -----------  -----------  -----------  ------------  -------------
 
Balances, December 31, 1986..............................       1,125       13,875           --       (12,477)         2,523
 
Repurchase of 375,000 shares of common stock.............        (375)      (4,625)          --            --         (5,000)
 
Issuance of 82,500 shares of common stock for services...          83        1,017           --            --          1,100
 
Net income...............................................          --           --           --       121,274        121,274
 
                                                           -----------  -----------  -----------  ------------  -------------
 
Balances, December 31, 1987..............................         833       10,267           --       108,797        119,897
 
Issuance of 55,556 shares of preferred stock for cash....          --      294,446           --            --        300,002
 
Issuance of 11,448 shares of common stock for cash upon
 exercise of stock options...............................          11        1,516           --            --          1,527
 
Issuance of 97,500 shares of common stock for services...          98       32,402           --            --         32,500
 
Net loss.................................................          --           --           --      (105,643)      (105,643)
 
                                                           -----------  -----------  -----------  ------------  -------------
 
Balances, December 31, 1988..............................         942      338,631           --         3,154        348,283
 
Issuance of 37,037 shares of preferred stock for cash....          --      336,296           --            --        340,000
 
Issuance of 7,500 shares of common stock for services....           7        2,493           --            --          2,500
 
Net loss.................................................          --           --           --        (5,025)        (5,025)
 
                                                           -----------  -----------  -----------  ------------  -------------
 
Balances, December 31, 1989..............................         949      677,420           --        (1,871)       685,758
 
Issuance of 37,037 shares of preferred stock for cash....          --      336,297           --            --        340,000
 
Issuance of 2,475 shares of common stock for cash upon
 exercise of stock options...............................           2          898           --            --            900
 
Net loss.................................................          --           --           --      (212,976)      (212,976)
 
                                                           -----------  -----------  -----------  ------------  -------------
 
Balances, December 31, 1990..............................         951    1,014,615           --      (214,847)       813,682
 
</TABLE>
 
                                      F-5
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                 STATEMENTS OF STOCKHOLDERS' EQUITY (CONTINUED)
             OCTOBER 22, 1986 (INCEPTION) THROUGH DECEMBER 31, 1995
<TABLE>
<CAPTION>
                                                            SERIES A     SERIES B     SERIES C     SERIES D     SERIES E
                                                            PREFERRED    PREFERRED    PREFERRED    PREFERRED    PREFERRED
                                                              STOCK        STOCK        STOCK        STOCK        STOCK
                                                           -----------  -----------  -----------  -----------  -----------
<S>                                                        <C>          <C>          <C>          <C>          <C>
Issuance of 4,500 shares of common stock for cash upon
 exercise of stock options...............................   $      --    $      --    $      --    $      --    $      --
Net loss.................................................          --           --           --           --           --
                                                           -----------  -----------       -----        -----        -----
Balances, December 31, 1991..............................       5,556        7,407           --           --           --
Issuance of 3,675 shares of common stock for cash upon
 exercise of stock options...............................          --           --           --           --           --
Issuance of 230,334 shares of common stock upon
 conversion of 129,630 shares of preferred stock.........      (5,556)      (7,407)          --           --           --
Repurchase and cancellation of 83,334 shares of common
 stock for cash..........................................          --           --           --           --           --
Issuance of 781,250 shares of preferred stock for cash,
 net of offering costs...................................          --           --          781           --           --
Issuance of 678,573 shares of preferred stock for cash,
 net of offering costs...................................          --           --           --          679           --
Issuance of 101,452 shares of common stock for services
 related to preferred stock offering.....................          --           --           --           --           --
Net loss.................................................          --           --           --           --           --
                                                           -----------  -----------       -----        -----        -----
Balances, December 31, 1992..............................          --           --          781          679
Issuance of 37,524 shares of common stock for cash upon
 exercise of stock options...............................          --           --           --           --           --
Issuance of 583,334 shares of preferred stock for cash,
 net of offering costs...................................          --           --           --           --          583
Issuance of 6,050 shares of preferred stock for
 services................................................          --           --           --           --            6
Deferred compensation related to grant of stock
 options.................................................          --           --           --           --           --
Net loss.................................................          --           --           --           --           --
                                                           -----------  -----------       -----        -----        -----
Balances, December 31, 1993..............................          --           --          781          679          589
 
<CAPTION>
                                                                                                   DEFICIT
                                                                                                 ACCUMULATED
                                                                        ADDITIONAL   DEFERRED       DURING          NET
 
                                                             COMMON      PAID-IN      COMPEN-    DEVELOPMENT   STOCKHOLDERS'
 
                                                              STOCK      CAPITAL      SATION        STAGE         EQUITY
 
                                                           -----------  ----------  -----------  ------------  -------------
 
<S>                                                        <C>          <C>         <C>          <C>           <C>
Issuance of 4,500 shares of common stock for cash upon
 exercise of stock options...............................   $       5   $    2,245   $      --    $       --    $     2,250
 
Net loss.................................................          --           --          --      (462,054)      (462,054)
 
                                                           -----------  ----------  -----------  ------------  -------------
 
Balances, December 31, 1991..............................         956    1,016,860          --      (676,901)       353,878
 
Issuance of 3,675 shares of common stock for cash upon
 exercise of stock options...............................           4        2,221          --            --          2,225
 
Issuance of 230,334 shares of common stock upon
 conversion of 129,630 shares of preferred stock.........         230       12,733          --            --             --
 
Repurchase and cancellation of 83,334 shares of common
 stock for cash..........................................         (83)    (299,917)         --            --       (300,000)
 
Issuance of 781,250 shares of preferred stock for cash,
 net of offering costs...................................          --    4,937,462          --            --      4,938,243
 
Issuance of 678,573 shares of preferred stock for cash,
 net of offering costs...................................          --    4,693,794          --            --      4,694,473
 
Issuance of 101,452 shares of common stock for services
 related to preferred stock offering.....................         101         (101)         --            --             --
 
Net loss.................................................          --           --          --    (2,607,359)    (2,607,359)
 
                                                           -----------  ----------  -----------  ------------  -------------
 
Balances, December 31, 1992..............................       1,208   10,363,052          --    (3,284,260)     7,081,460
 
Issuance of 37,524 shares of common stock for cash upon
 exercise of stock options...............................          38       25,545          --            --         25,583
 
Issuance of 583,334 shares of preferred stock for cash,
 net of offering costs...................................          --    6,968,115          --            --      6,968,698
 
Issuance of 6,050 shares of preferred stock for
 services................................................          --       72,594          --            --         72,600
 
Deferred compensation related to grant of stock
 options.................................................          --      766,500    (745,458)           --         21,042
 
Net loss.................................................          --           --          --    (7,158,581)    (7,158,581)
 
                                                           -----------  ----------  -----------  ------------  -------------
 
Balances, December 31, 1993..............................       1,246   18,195,806    (745,458)  (10,442,841)     7,010,802
 
</TABLE>
 
                                      F-6
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                 STATEMENTS OF STOCKHOLDERS' EQUITY (CONTINUED)
             OCTOBER 22, 1986 (INCEPTION) THROUGH DECEMBER 31, 1995
<TABLE>
<CAPTION>
                                                            SERIES A     SERIES B     SERIES C     SERIES D     SERIES E
                                                            PREFERRED    PREFERRED    PREFERRED    PREFERRED    PREFERRED
                                                              STOCK        STOCK        STOCK        STOCK        STOCK
                                                           -----------  -----------  -----------  -----------  -----------
<S>                                                        <C>          <C>          <C>          <C>          <C>
Issuance of 3,475,666 shares of common stock upon
 conversion of 2,049,207 shares of preferred stock.......   $      --    $      --    $    (781)   $    (679)   $    (589)
Issuance of 2,000,000 shares of common stock for cash,
 net of offering costs...................................          --           --           --           --           --
Issuance of 20,000 shares of common stock for services...          --           --           --           --           --
Issuance of 46,118 shares of common stock for cash upon
 exercise of options.....................................          --           --           --           --           --
Amortization of deferred compensation....................          --           --           --           --           --
Net loss.................................................          --           --           --           --           --
                                                           -----------  -----------       -----        -----        -----
Balances, December 31, 1994..............................          --           --           --           --           --
Issuance of 242,385 shares of common stock for cash upon
 exercise of options.....................................          --           --           --           --           --
Issuance of 39,771 shares of common stock for cash.......          --           --           --           --           --
Issuance of 3,287 shares of common stock for services....          --           --           --           --           --
Amortization of deferred compensation....................          --           --           --           --           --
Net loss.................................................          --           --           --           --           --
                                                           -----------  -----------       -----        -----        -----
Balances, December 31, 1995..............................   $      --    $      --    $      --    $      --    $      --
                                                           -----------  -----------       -----        -----        -----
                                                           -----------  -----------       -----        -----        -----
 
<CAPTION>
                                                                                                   DEFICIT
                                                                                                 ACCUMULATED
                                                                        ADDITIONAL   DEFERRED       DURING          NET
 
                                                             COMMON      PAID-IN      COMPEN-    DEVELOPMENT   STOCKHOLDERS'
 
                                                              STOCK      CAPITAL      SATION        STAGE         EQUITY
 
                                                           -----------  ----------  -----------  ------------  -------------
 
<S>                                                        <C>          <C>         <C>          <C>           <C>
Issuance of 3,475,666 shares of common stock upon
 conversion of 2,049,207 shares of preferred stock.......   $   3,475   $   (1,426)  $      --    $       --    $        --
 
Issuance of 2,000,000 shares of common stock for cash,
 net of offering costs...................................       2,000    9,530,252          --            --      9,532,252
 
Issuance of 20,000 shares of common stock for services...          20       95,958          --            --         95,978
 
Issuance of 46,118 shares of common stock for cash upon
 exercise of options.....................................          46       26,477          --            --         26,523
 
Amortization of deferred compensation....................          --           --     255,500            --        255,500
 
Net loss.................................................          --           --          --    (6,756,333)    (6,756,333)
 
                                                           -----------  ----------  -----------  ------------  -------------
 
Balances, December 31, 1994..............................       6,787   27,847,067    (489,958)  (17,199,174)    10,164,722
 
Issuance of 242,385 shares of common stock for cash upon
 exercise of options.....................................         243      100,378          --            --        100,621
 
Issuance of 39,771 shares of common stock for cash.......          40      109,827          --            --        109,867
 
Issuance of 3,287 shares of common stock for services....           3        9,858          --            --          9,861
 
Amortization of deferred compensation....................          --           --     255,500            --        255,500
 
Net loss.................................................          --           --          --    (3,318,091)    (3,318,091)
 
                                                           -----------  ----------  -----------  ------------  -------------
 
Balances, December 31, 1995..............................   $   7,073   $28,067,130  $(234,458)  ($20,517,265)  $ 7,322,480
 
                                                           -----------  ----------  -----------  ------------  -------------
 
                                                           -----------  ----------  -----------  ------------  -------------
 
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-7
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                                                   OCTOBER 22,
                                                                                                       1986
                                                                                                   (INCEPTION)
                                                                YEAR ENDED DECEMBER 31,              THROUGH
                                                        ----------------------------------------   DECEMBER 31,
                                                            1993          1994          1995           1995
                                                        ------------  ------------  ------------  --------------
<S>                                                     <C>           <C>           <C>           <C>
Cash flows from operating activities:
  Net loss............................................  $ (7,158,581) $ (6,756,333) $ (3,318,091) $  (20,517,265)
  Adjustments to reconcile net loss to net cash used
   in operating activities:
    Depreciation and amortization.....................       366,933       596,842       674,039       2,413,028
    Gain on sale of equipment.........................            --            --            --         (28,720)
    Issuance of common and preferred stock in lieu of
     cash for services................................        72,600        95,978         9,861         214,539
    Amortization of deferred compensation.............        21,042       255,500       255,500         532,042
    Decrease (increase) in operating assets:
      Accounts receivable.............................        97,747      (226,788)      237,000         (23,000)
      Other assets....................................        28,819       (21,553)       24,874         (45,754)
    Increase (decrease) in operating liabilities:
      Accounts payable and accrued expenses...........       435,818       142,592       110,187       1,176,178
      Deferred income.................................     3,400,000    (3,400,000)      587,500         587,500
                                                        ------------  ------------  ------------  --------------
        Net cash used in operating activities.........    (2,735,622)   (9,313,762)   (1,419,130)    (15,691,452)
Cash flows from investing activities:
  Net sale (purchase) of marketable investment
   securities.........................................     1,589,384    (3,392,135)    3,092,135        (300,000)
  Acquisition of equipment and leasehold
   improvements.......................................    (1,206,683)   (1,048,020)     (373,171)     (4,059,126)
  Proceeds from sale of equipment.....................       648,274            --            --       1,048,484
                                                        ------------  ------------  ------------  --------------
        Net cash provided by (used in) investing
         activities...................................     1,030,975    (4,440,155)    2,718,964      (3,310,642)
</TABLE>
 
                                      F-8
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                      STATEMENTS OF CASH FLOWS (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                                                    OCTOBER 22,
                                                                                                        1986
                                                                                                    (INCEPTION)
                                                                 YEAR ENDED DECEMBER 31,              THROUGH
                                                         ----------------------------------------   DECEMBER 31,
                                                             1993          1994          1995           1995
                                                         ------------  ------------  ------------  --------------
<S>                                                      <C>           <C>           <C>           <C>
Cash flows from financing activities:
  Proceeds from note payable to bank...................  $         --  $         --  $         --  $      123,855
  Proceeds from issuance of preferred stock and
   collection of subscription receivable...............     2,968,698     4,000,000            --      17,581,416
  Proceeds from issuance of common stock...............        25,583     9,558,775       210,488       9,811,748
  Proceeds from long-term debt.........................            --            --     1,166,434       1,166,434
  Principal payments on note payable to bank...........            --            --            --        (123,855)
  Principal payments under capital lease obligations...       (53,618)     (287,539)     (427,053)       (879,415)
  Principal payments on long-term debt.................       (11,489)           --      (141,160)       (338,464)
  Repurchase of preferred stock........................            --            --            --        (300,000)
                                                         ------------  ------------  ------------  --------------
    Net cash provided by financing activities..........     2,929,174    13,271,236       808,709      27,041,719
                                                         ------------  ------------  ------------  --------------
Net increase (decrease) in cash and cash equivalents...     1,224,527      (482,681)    2,108,543       8,039,625
Cash and cash equivalents at beginning of period.......     5,189,236     6,413,763     5,931,082              --
                                                         ------------  ------------  ------------  --------------
Cash and cash equivalents at end of period.............  $  6,413,763  $  5,931,082  $  8,039,625  $    8,039,625
                                                         ------------  ------------  ------------  --------------
                                                         ------------  ------------  ------------  --------------
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest.................................  $     91,038  $    149,013  $    171,752  $      475,713
Cash paid for taxes....................................            --            --       500,000         500,000
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND
 FINANCING ACTIVITIES
Acquisition of equipment through incurrence of capital
 lease obligations.....................................  $    648,274  $     25,669  $     62,945  $    1,368,406
Acquisition of leasehold improvements through
 incurrence of debt....................................            --            --            --         197,304
Issuance of preferred stock for stock subscription
 receivable............................................     4,000,000            --            --       4,000,000
Accrual of deferred offering costs.....................       150,000            --            --         150,000
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-9
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                         NOTES TO FINANCIAL STATEMENTS
                       DECEMBER 31, 1993, 1994, AND 1995
 
(1) ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
    NPS  Pharmaceuticals, Inc.  (the "Company"), considered  a development stage
company under the guidelines of STATEMENT OF FINANCIAL ACCOUNTING STANDARDS  NO.
7,   is  engaged   in  the  discovery   and  commercial   development  of  novel
pharmaceutical products, primarily small molecule drugs that target cell surface
receptors and ion channels. Since inception, the Company's principal  activities
have been performing research and development, raising capital, and establishing
research  and license agreements. The  following significant accounting policies
are followed by the Company in preparing its financial statements:
 
    (a)  CASH EQUIVALENTS
 
        Cash equivalents of $4.8 million and  $5.4 million at December 31,  1994
    and 1995, respectively, consist of short-term securities and certificates of
    deposit  with an initial term of less than three months. For purposes of the
    statements of  cash flows,  the  Company considers  all highly  liquid  debt
    instruments  with original  maturities of  three months  or less  to be cash
    equivalents.
 
    (b)  REVENUE RECOGNITION
 
        The Company recognizes revenue from  its research agreements as  related
    research costs are incurred and from its license fees and milestone payments
    as  earned.  Cash received  in  advance of  the  performance of  the related
    research is recorded as deferred income.
 
    (c)  PLANT AND EQUIPMENT
 
        Plant and equipment are stated at cost. Equipment under capital lease is
    stated at the lower of  the present value of  minimum lease payments at  the
    beginning  of the lease term or fair value of the equipment at the inception
    of the lease.
 
        Depreciation and  amortization of  equipment (including  equipment  held
    under  capital lease) is  calculated on the  straight-line method over their
    estimated useful lives of five  years. Leasehold improvements are  amortized
    using  the straight-line method over the shorter of the life of the asset or
    remainder of  the lease  term.  Amortization of  assets held  under  capital
    leases is included with depreciation and amortization expense.
 
    (d)  NET LOSS PER SHARE
 
        The  Company's loss per share is based on the weighted average number of
    common shares  outstanding  during  the periods.  Common  stock  equivalents
    (stock  options and warrants) have been excluded in the computation as their
    inclusion would have an  antidilutive effect. For periods  prior to May  26,
    1994,  the date  of the  Company's initial  public offering,  upon which all
    outstanding shares of  preferred stock  were converted to  shares of  common
    stock,  the loss presented  is pro forma after  giving retroactive effect to
    the conversion of Series C,  D, and E preferred  stock and the inclusion  of
    common  stock  options issued  for  consideration below  the  initial public
    offering price  during the  twelve-month period  prior to  the date  of  the
    initial  filing  of  the  Registration  Statement,  even  when antidilutive,
    pursuant to Securities and Exchange Commission Staff Accounting Bulletin No.
    83, using the treasury-stock method.
 
                                      F-10
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(1) ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    (e)  INCOME TAXES
 
        The Company  accounts for  income taxes  using the  asset and  liability
    method.  Under  the  asset and  liability  method, deferred  tax  assets and
    liabilities are recognized for the  future tax consequences attributable  to
    differences  between the  financial statement  carrying amounts  of existing
    assets and liabilities and their  respective tax bases, operating loss,  and
    tax  credit carryforwards. Deferred tax  assets and liabilities are measured
    using enacted tax rates expected to apply to taxable income in the years  in
    which  those temporary differences are expected  to be recovered or settled.
    The effect on deferred tax assets and  liabilities of a change in tax  rates
    is recognized in income in the period that includes the enactment date.
 
    (f)  USE OF ESTIMATES
 
        Management of the Company has made estimates and assumptions relating to
    reporting  of assets and liabilities and the disclosure of contingent assets
    and liabilities to  prepare these  financial statements  in conformity  with
    generally  accepted accounting principles. Actual  results could differ from
    those estimates.
 
    (g)  MARKETABLE INVESTMENT SECURITIES
 
        The Company adopted the provisions of Statement of Financial  Accounting
    Standards  No. 115,  ACCOUNTING FOR CERTAIN  INVESTMENTS IN  DEBT AND EQUITY
    ("Statement 115"), January  1, 1994.  Statement 115 requires  that debt  and
    equity securities be grouped in one of three categories: trading, available-
    for-sale,  or  held-to-maturity.  Trading  securities  are  bought  and held
    principally  for   the  purpose   of  selling   them  in   the  near   term.
    Held-to-maturity  securities are those  securities in which  the Company has
    the ability  and intent  to  hold the  security  until maturity.  All  other
    securities  not included  in trading  or held-to-maturity  are classified as
    available-for-sale. The effect  of this  adoption of Statement  115 was  not
    material to the Company's financial statements.
 
        Available-for    sale   securities   are   recorded   at   fair   value.
    Held-to-maturity securities are recorded at amortized cost, adjusted for the
    amortization or accretion of premiums or discounts. Unrealized holding gains
    and losses, net of the related tax effect, on available-for-sale  securities
    are  excluded  from earnings  and are  reported as  a separate  component of
    stockholders' equity until realized. Realized gains and losses from the sale
    of available-for-sale securities are determined on a specific-identification
    basis.
 
        A  decline   in  the   market  value   of  any   available-for-sale   or
    held-to-maturity  security below  cost that  is deemed  other than temporary
    results in a reduction in carrying  amount to fair value. The impairment  is
    charged  to earnings and a  new cost basis for  the security is established.
    Premiums and  discounts are  amortized  or accreted  over  the life  of  the
    related  held-to-maturity  security  as  an adjustment  to  yield  using the
    effective interest method. Dividend and interest income are recognized  when
    earned.
 
                                      F-11
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(2) MARKETABLE INVESTMENT SECURITIES
    The amortized cost, gross unrealized holding gains, gross unrealized holding
losses  and fair value for available-for-sale and held-to-maturity securities by
major security type and class of security at December 31, 1994 and 1995, were as
follows:
 
<TABLE>
<CAPTION>
                                                                                                  GROSS
                                                                                  GROSS        UNREALIZED
                                                                AMORTIZED      UNREALIZED        HOLDING
                                                                   COST       HOLDING GAINS      LOSSES       FAIR VALUE
                                                               ------------  ---------------  -------------  ------------
<S>                                                            <C>           <C>              <C>            <C>
At December 31, 1994
Held-to-maturity:
  Corporate obligations (due within one year)................  $  3,392,135            --       $     296    $  3,391,839
At December 31, 1995
Available-for-sale:
  Corporate obligations (due within one year)................  $    300,000            --              --    $    300,000
</TABLE>
 
(3) COLLABORATIVE AND LICENSE AGREEMENTS
    The Company is pursuing product development both on an independent basis and
in collaboration with others. Following is a description of significant  current
collaborations and license agreements.
 
    (a)  KIRIN BREWERY COMPANY, LIMITED
 
        Effective June 30, 1995, NPS entered into a five year agreement with the
    pharmaceutical  division  of  Kirin  Brewery  Company,  Limited  (a Japanese
    company), to develop and commercialize Norcalcin in Japan, China, Korea, and
    Taiwan. Kirin paid to NPS a $5.0  million license fee and has agreed to  pay
    up  to  $7.0 million  in  research support,  potential  additional milestone
    payments totaling $13.0 million, and  royalties on product sales. The  Kirin
    research  support payments are $500,000 per  quarter through June 1996 and a
    total of  $5.0  million  over  the  remaining  four  years.  Kirin  received
    exclusive  rights to develop  and sell Norcalcin  within its territory. Both
    parties will participate  in a collaborative  research program around  NPS's
    parathyroid calcium receptor technology.
 
        The  Company recognized the  $5.0 million nonrefundable  license fee and
    $1.0 million in research  support as revenue in  1995. The agreement may  be
    terminated by Kirin after June 30, 1996.
 
    (b)  SMITHKLINE BEECHAM CORPORATION
 
        Effective  November  1, 1993,  the Company  entered into  the SmithKline
    Beecham  Agreement  ("SB  Agreement")  to  collaborate  on  the   discovery,
    development  and marketing  of drugs  to treat  osteoporosis and  other bone
    metabolism  disorders,  excluding  hyperparathyroidism.  The  SB   Agreement
    establishes  a three year research  collaboration between the parties, which
    may be extended  on mutual agreement.  Under the SB  Agreement, the  Company
    granted  SmithKline  Beecham the  exclusive  license to  develop  and market
    worldwide compounds  described  under  the  SB  Agreement,  subject  to  the
    Company's right to co-promote in the United States. Once compounds have been
    selected  for development, SmithKline Beecham has agreed to conduct and fund
    all development of such  products, including all  human clinical trials  and
    regulatory submissions.
 
        The Company received an initial licensing fee payment of $4.0 million in
    November  1993 and  received an additional  $2.0 million  payment in January
    1995. The Company recognized this revenue as the related research costs were
    incurred, and recognized  $600,000 in 1993,  $3.6 million in  1994 and  $1.8
    million  in 1995.  Commencing on July  1, 1995, the  Company began receiving
    quarterly research
 
                                      F-12
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(3) COLLABORATIVE AND LICENSE AGREEMENTS (CONTINUED)
 
    (b)  SMITHKLINE BEECHAM CORPORATION (CONTINUED)
    payments from SmithKline  Beecham to  support research  efforts through  the
    scheduled  expiration  of the  research  term on  October  31, 1996,  if not
    previously  terminated.  The  Company  recognized  $1.6  million  from  such
    payments  in 1995. The Company is also entitled to receive payments upon the
    achievement of specific development  and regulatory milestones. The  Company
    will  receive royalties on sales of such compounds by SmithKline Beecham and
    a share of the profits from co-promoted products.
 
        S.R. One,  Limited, an  affiliate of  SmithKline Beecham,  is an  equity
    investor in the Company.
 
        Subsequent  to year-end, the  Company reached its  first milestone under
    the SB  Agreement and  received a  corresponding milestone  payment of  $3.0
    million.
 
    (c)  THE BRIGHAM AND WOMEN'S HOSPITAL, INC.
 
        In  February  1993, the  Company entered  into  two agreements  with The
    Brigham and  Women's  Hospital,  Inc.  (the  "Hospital").  Under  the  first
    agreement,  the  Company received  an  exclusive license  to  the Hospital's
    calcium receptor patentable technology  at that date.  The Company will  pay
    milestone  payments  to the  Hospital  and a  royalty  on sales  of products
    covered by any  issued patent under  the license. The  Company also  entered
    into  an  agreement to  sponsor research  through February  28, 1996  at the
    Hospital in the amount of $300,000 per year and the Hospital granted to  the
    Company  a  right  of first  negotiation  for  license rights  to  any newly
    discovered patentable calcium  receptor technology. During  1993, 1994,  and
    1995,  the Company  paid to the  Hospital $400,241,  $320,121, and $306,777,
    respectively, in sponsored research payments and license fees.
 
        On February 7, 1996, the Company reached an agreement with the  Hospital
    to extend the sponsored collaborative research agreement. Under the terms of
    the  extension, the Company  has agreed to continue  funding research for an
    additional two years. The extended research agreement calls for the  Company
    to  make research  support and advance  royalty payments of  $810,000 to the
    Hospital during the period from February 1996 to February 1998.
 
    (d)  SMALL BUSINESS INNOVATION RESEARCH GRANTS
 
        The Company  recognized  revenue  of $267,568,  $260,706,  and  $126,444
    during 1993, 1994, and 1995, respectively, under the terms of Small Business
    Innovation Research grants from three government agencies.
 
                                      F-13
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(4) LEASES
    The  Company is obligated under capital  leases for equipment that expire at
various dates during the next three years. The Company also has a  noncancelable
operating  lease for office space that expires in September 1999. Rental expense
for this operating lease  was $340,276, $413,552, and  $493,667 for 1993,  1994,
and  1995, respectively. The  present value of future  minimum lease payments on
capital leases and future lease payments under the noncancelable operating lease
as of December 31, 1995 are:
 
<TABLE>
<CAPTION>
                                                                       CAPITAL     OPERATING
                                                                        LEASES       LEASE
                                                                      ----------  ------------
<S>                                                                   <C>         <C>
Year ending December 31:
  1996..............................................................  $  466,129  $    525,919
  1997..............................................................      48,123       525,919
  1998..............................................................       9,127       525,919
  1999..............................................................          --       394,439
                                                                      ----------  ------------
    Total minimum lease payments....................................     523,379  $  1,972,196
                                                                                  ------------
                                                                                  ------------
Less amounts representing interest (at rates ranging from 6% to
 16%)...............................................................      34,388
                                                                      ----------
Present value of net minimum capital lease payments.................     488,991
Less current installments of obligations under capital leases.......     435,230
                                                                      ----------
    Obligations under capital leases, excluding current
     installments...................................................  $   53,761
                                                                      ----------
                                                                      ----------
</TABLE>
 
        At December 31, 1994 and 1995, the gross amount of equipment and related
    accumulated amortization recorded under capital leases was as follows:
 
<TABLE>
<CAPTION>
                                                                        1994          1995
                                                                    ------------  ------------
<S>                                                                 <C>           <C>
Equipment.........................................................  $  1,232,980  $  1,212,699
Less accumulated amortization.....................................       572,090       748,881
                                                                    ------------  ------------
    Net equipment.................................................  $    660,890  $    463,818
                                                                    ------------  ------------
                                                                    ------------  ------------
</TABLE>
 
        The Company has granted a leasing  company a warrant to purchase  20,250
    common shares at $4.67 per share. The warrant expires in May 1996.
 
(5) LONG-TERM DEBT
    Long-term  debt at December 31, 1995 consists of the following notes payable
to a financial institution:
 
<TABLE>
<S>                                                               <C>
10% to 16% notes payable in monthly installments of $37,105
 including interest, due June 1, 1998 through June 1, 1999;
 secured by certain equipment and leasehold improvements........  $1,025,274
Less, current installments......................................    331,746
                                                                  ---------
    Long-term debt, excluding current installments..............  $ 693,528
                                                                  ---------
                                                                  ---------
</TABLE>
 
        The aggregate  maturities  of  long-term  debt for  each  of  the  years
    subsequent  to  December  31, 1995  are  as follows:  1996,  $331,746; 1997,
    $378,613; 1998, $302,065; and 1999, $12,850.
 
                                      F-14
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(5) LONG-TERM DEBT (CONTINUED)
        In  connection  with  these  notes  payable,  the  Company  granted  the
    financial institution a warrant to purchase 32,542 shares of common stock at
    $3.69 per share. The warrant expires in June 2002.
 
(6) CAPITAL STOCK
    The  Company is incorporated  under the laws  of the State  of Delaware with
authorized capital of 5,000,000 shares of preferred stock and 20,000,000  shares
of  common stock, all  with a par value  of $.001. No  shares of preferred stock
were issued or outstanding at December 31, 1994 and 1995.
 
    The Company has three  stock option plans: the  1987 Stock Option Plan  (the
"1987  Plan"), the 1994  Equity Incentive Plan  (the "1994 Plan"),  and the 1994
Non-Employee Directors' Stock Option Plan (the "Directors' Plan"). An  aggregate
of  2,390,000 shares are  authorized for issuance  under the three  plans. As of
December 31, 1995, there are no shares reserved for future grant under the  1987
Plan,  there are 315,503 shares  reserved for future grant  under the 1994 Plan,
and there are 36,000 shares reserved for future grant under the Directors' Plan.
Under the Company's 1994 Plan, the exercise price of options granted is not less
than the fair market value  on the date of grant.  The number of shares,  terms,
and   exercise  period  are   determined  by  the  Board   of  Directors  on  an
option-by-option basis, but the exercise period does not extend beyond ten years
from the date of the grant.
 
    Under the Directors' Plan, each new director  who is not an employee of  the
Company  will be granted  an option to  purchase 15,000 shares  of common stock.
Additional options will be granted at  December 31 of each subsequent year.  The
exercise price of options granted is the fair market value on the date of grant.
 
    A  summary of activity related to aggregate options under all three plans is
indicated in the following table:
 
<TABLE>
<CAPTION>
                                      1993
                            -------------------------             1994                         1995
                                          EXERCISE     ---------------------------  ---------------------------
                             OPTIONS        PRICE       OPTIONS    EXERCISE PRICE    OPTIONS    EXERCISE PRICE
                            ----------  -------------  ----------  ---------------  ----------  ---------------
<S>                         <C>         <C>            <C>         <C>              <C>         <C>
Outstanding, beginning of
 year.....................     719,400  $  .34 -  .81   1,192,875  $    .34 - 4.00   1,419,125  $    .34 - 6.00
Granted...................     511,500     .74 - 4.00     309,800      3.00 - 6.00     374,000      3.50 - 8.25
Exercised.................     (37,524)    .34 -  .74     (46,118)      .34 -  .74    (257,633)      .34 - 2.00
Canceled..................        (501)        -  .74     (37,432)      .34 - 4.00      (4,568)     2.00 - 3.00
                            ----------  -------------  ----------  ---------------  ----------  ---------------
Outstanding, end of
 year.....................   1,192,875  $  .34 - 4.00   1,419,125  $    .34 - 6.00   1,530,924  $    .34 - 8.25
                            ----------  -------------  ----------  ---------------  ----------  ---------------
                            ----------  -------------  ----------  ---------------  ----------  ---------------
</TABLE>
 
    Exercise of options by employees,  consultants, and directors has been  made
subject  to vesting based on job tenure and  as of December 31, 1995, options to
purchase 802,540 shares of common stock are vested and exercisable.
 
    In November  and  December 1993,  the  Company issued  options  to  purchase
378,750  and 4,500 shares of common stock, respectively, at an exercise price of
$2.00 and $4.00 per share,  respectively, to employees, officers, and  directors
of  the Company. For financial statement  presentation purposes, the Company has
recorded as deferred compensation expense the excess of the deemed value of  the
common  stock at  the date  of grant over  the exercise  price. The compensation
expense will be amortized ratably over the
 
                                      F-15
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(6) CAPITAL STOCK (CONTINUED)
three-year vesting period of the options  and will aggregate $766,500 over  such
period.  During 1995, employees exercised 257,633 stock options utilizing 15,248
common shares and cash for 242,385 common shares.
 
    The Company's 1994 Employee  Stock Purchase Plan  (the "Purchase Plan")  has
90,000  shares authorized  for purchase by  employees of  the Company. Employees
have purchased 39,771 shares  under the Purchase Plan  as of December 31,  1995,
and 50,229 shares remain available for future purchase.
 
(7) INCOME TAXES
    The  Company has income tax expense of  $500,000 for the year ended December
31, 1995 consisting of current foreign taxes.
 
    Income tax expense differed from the  amounts computed by applying the  U.S.
federal  income tax rate of 34 percent  to net income (loss) before income taxes
as a result of the following:
 
<TABLE>
<CAPTION>
                                                                  1993          1994          1995
                                                              ------------  ------------  ------------
<S>                                                           <C>           <C>           <C>
Computed expected tax benefit...............................  $ (2,433,918) $ (2,297,153) $   (958,150)
Change in the beginning-of-the-year balance of the valuation
 allowance for deferred tax assets allocated to income tax
 expense....................................................     2,621,555     2,376,354     1,279,785
Foreign taxes net of federal income tax benefit.............            --            --       330,000
Other.......................................................      (187,637)      (79,201)     (151,635)
                                                              ------------  ------------  ------------
                                                              $         --  $         --  $    500,000
                                                              ------------  ------------  ------------
                                                              ------------  ------------  ------------
</TABLE>
 
    The tax  effects of  temporary  differences that  give rise  to  significant
portions  of the deferred tax assets at December 31, 1994 and 1995 are presented
below:
 
<TABLE>
<CAPTION>
                                                                       1994          1995
                                                                   ------------  ------------
<S>                                                                <C>           <C>
Deferred tax assets:
  Deferred revenue...............................................  $         --  $    220,000
  Equipment and leasehold improvements, principally due to
   differences in depreciation...................................       183,000       159,000
  Net operating loss carryforward................................     5,815,000     6,873,000
  Research activities credit carryforward........................       803,000       953,000
                                                                   ------------  ------------
    Total gross deferred tax assets..............................     6,801,000     8,205,000
    Less valuation allowance.....................................     6,801,000     8,205,000
                                                                   ------------  ------------
    Net deferred tax assets......................................  $         --  $         --
                                                                   ------------  ------------
                                                                   ------------  ------------
</TABLE>
 
    Subsequently recognized tax benefits relating to the valuation allowance for
deferred tax assets as of December 31,  1995 will be allocated as an income  tax
benefit to be reported in the statement of operations.
 
    The  valuation allowance for deferred  tax assets as of  January 1, 1994 was
$4.2 million. The net change in the Company's total valuation allowance for  the
years  ended December 31, 1994 and 1995 was an increase of $2.6 million and $1.4
million, respectively.
 
                                      F-16
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(7) INCOME TAXES (CONTINUED)
    At December 31, 1995, the Company had net operating loss and research credit
carryforwards  to  offset  future  income   for  federal  income  tax   purposes
approximately as follows:
 
<TABLE>
<CAPTION>
                                                 NET OPERATING LOSS   NET OPERATING LOSS
                                                  CARRYFORWARD FOR     CARRYFORWARD FOR      RESEARCH
                                                 REGULAR INCOME TAX  ALTERNATIVE MINIMUM      CREDIT
                                                      PURPOSES           TAX PURPOSES      CARRYFORWARD
                                                 ------------------  --------------------  ------------
<S>                                              <C>                 <C>                   <C>
Expiring
  2002.........................................    $           --       $           --      $    2,000
  2003.........................................                --                   --          14,000
  2004.........................................           159,000               90,000          18,000
  2005.........................................           292,000              273,000          20,000
  2006.........................................         1,377,000            1,385,000          48,000
  2007.........................................         1,141,000            1,321,000          49,000
  2008.........................................         3,132,000            3,425,000         335,000
  2009.........................................         9,493,000            9,492,000         317,000
  2010.........................................         2,832,000            2,939,000         150,000
                                                 ------------------        -----------     ------------
                                                   $   18,426,000       $   18,925,000      $  953,000
                                                 ------------------        -----------     ------------
                                                 ------------------        -----------     ------------
</TABLE>
 
    Under  the rules of the Tax Reform Act  of 1986, the Company has undergone a
greater than 50 percent change of ownership since 1986. Consequently, use of the
Company's net  operating  loss  carryforward and  research  credit  carryforward
against future taxable income in any one year may be limited. The maximum amount
of  carryforwards available  in a given  year is  limited to the  product of the
Company's fair market  value on  the date of  ownership change  and the  federal
long-term  tax-exempt rate, plus any limited  carryforward not utilized in prior
years.
 
(8) EMPLOYEE BENEFIT PLAN
    In October 1990, the  Company adopted a  tax-qualified employee savings  and
retirement  plan (the  "401(k) Plan") covering  all of  the Company's employees.
Pursuant to  the  401(k) Plan,  employees  may  elect to  reduce  their  current
compensation  by  the  lesser of  15  percent  of eligible  compensation  or the
prescribed annual limit ($9,240 in 1995)  and have the amount of such  reduction
contributed  to the 401(k) Plan. The 401(k)  Plan permits, but does not require,
additional matching contributions to the 401(k) Plan by the Company on behalf of
all participants. The Company has not made any such contributions to date.
 
(9) CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
    A director  of  the Company  is  Vice  President of  Plexus  Ventures,  Inc.
("Plexus").  The Company had a consulting agreement with Plexus through December
31, 1995, whereunder Plexus assisted the  Company with its effort to estalish  a
collaboration for Norcalcin in Europe. During the years ended December 31, 1994,
and  1995,  the  Company  paid  fees to  Plexus  totaling  $34,000  and $84,500,
respectively. Plexus will earn an additional  fee as payments are received  from
Amgen.  Under  the agreement  the maximum  additional fee  is $500,000,  but the
Company and Plexus have agreed to negotiate in good faith for an increase in the
maximum because of the non-European territory licensed to Amgen.
 
(10)ACCOUNTING STANDARDS NOT YET ADOPTED
    In  October  of  1995,  the  Financial  Accounting  Standards  Board  issued
Statement  of Financial Accounting Standards No. 123, ACCOUNTING FOR STOCK BASED
COMPENSATION ("FASB 123"). The Company is
 
                                      F-17
<PAGE>
                           NPS PHARMACEUTICALS, INC.
                         (A DEVELOPMENT STAGE COMPANY)
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                       DECEMBER 31, 1993, 1994, AND 1995
 
(10)ACCOUNTING STANDARDS ISSUED NOT YET ADOPTED (CONTINUED)
required to adopt  the provisions of  this statement for  years beginning  after
December  15, 1995. This statement encourages all entities to adopt a fair value
based method  of  accounting  for  employee  stock  options  or  similar  equity
instruments.   However,  it  also  allows  an  entity  to  continue  to  measure
compensation cost for those plans using the intrinsic-value method of accounting
prescribed by APB opinion No. 25, ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES ("APB
25"). Entities electing to remain  with the accounting in  APB 25 must make  pro
forma  disclosures of  net income and  earnings per  share as if  the fair value
based method of  accounting defined in  this statement had  been applied. It  is
currently  anticipated that  the Company  will continue  to measure compensation
costs in accordance  with APB 25  and provide the  disclosures required by  FASB
123.
 
(11)SUBSEQUENT EVENTS
    On  March  18, 1996,  the  Company entered  into  a development  and license
agreement with Amgen Inc. ("Amgen")  to develop and commercialize  Norcalcin-TM-
and  other compounds  for the  treatment of  hyperparathyroidism and indications
other than osteoporosis.  Amgen agreed  to pay to  the Company  a $10.0  million
non-refundable  license fee, potential additional development milestone payments
totaling $26.0 million, and  royalties on any future  product sales. Amgen  also
agreed  to purchase one  million shares of  the Company's common  stock for $7.5
million. Amgen is required  to pay all costs  of developing and  commercializing
products.  Amgen  received exclusive  worldwide  rights excluding  Japan, China,
Korea and Taiwan. The agreement may be terminated by Amgen at any time.
 
    The Company received the $10.0 million  license fee upon the signing of  the
definitive  agreement in March 1996. It is anticipated that closing of the stock
agreement and issuance  of the shares  will take  place in March  1996. The  pro
forma  balance sheet  at December  31, 1995 reflects  receipt from  Amgen of the
$10.0 million license fee and the issuance of the Common Stock for cash of  $7.5
million.
 
(12)CONTINGENCY
   
    The  Company is subject  to federal, state and  local environmental laws and
regulations. It is  the policy  of the  Company to  comply with  these laws  and
regulations.   The  Company  has  received  a  letter  from  the  United  States
Environmental Protection Agency notifying the Company that it may have  incurred
a  liability  for  two barrels  of  radioactive  waste taken  by  a  third party
contractor to a hazardous and radioactivity waste storage treatment and disposal
facility. The Company  has verified that  the two barrels  containing the  waste
have  been  removed  from the  disposal  facility  and believes,  based  upon an
inspection, that the barrels  neither leaked nor were  damaged. The Company  has
made no provision for any future liability for this contingency since any amount
of potential liability is not reasonably estimable.
    
 
                                      F-18
<PAGE>
- - --------------------------------------------
                                    --------------------------------------------
- - --------------------------------------------
                                    --------------------------------------------
 
    NO  DEALER,  SALES  REPRESENTATIVE  OR ANY  OTHER  PERSON  IS  AUTHORIZED IN
CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE ANY INFORMATION OR TO MAKE  ANY
REPRESENTATION  NOT CONTAINED HEREIN AND, IF  GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE  COMPANY
OR  THE UNDERWRITERS. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A
SOLICITATION OF AN OFFER TO BUY, ANY SECURITY OTHER THAN THE SECURITIES  OFFERED
HEREBY, NOR DOES IT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY  ANY  SUCH SECURITIES  TO  ANY PERSON  IN ANY  JURISDICTION  IN WHICH  IT IS
UNLAWFUL TO MAKE  SUCH AN OFFER  OR SOLICITATION. NEITHER  THE DELIVERY OF  THIS
PROSPECTUS  NOR ANY SALE MADE HEREUNDER  SHALL UNDER ANY CIRCUMSTANCES CREATE AN
IMPLICATION THAT THERE HAS BEEN  NO CHANGE IN THE  AFFAIRS OF THE COMPANY  SINCE
THE  DATE HEREOF OR THAT  THE INFORMATION CONTAINED HEREIN  IS CORRECT AS OF ANY
DATE SUBSEQUENT TO THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                     PAGE
                                                   ---------
<S>                                                <C>
Prospectus Summary...............................          3
Risk Factors.....................................          6
Use of Proceeds..................................         14
Price Range of Common Stock......................         15
Dividend Policy..................................         15
Capitalization...................................         16
Dilution.........................................         17
Selected Financial Data..........................         18
Management's Discussion and Analysis of Financial
  Condition and Results of Operations............         19
Business.........................................         22
Management.......................................         42
Certain Relationships and Related Transactions...         51
Principal Stockholders...........................         52
Description of Capital Stock.....................         54
Underwriting.....................................         56
Legal Matters....................................         58
Experts..........................................         58
Additional Information...........................         58
Index to Financial Statements....................        F-1
</TABLE>
 
                             ---------------------
 
                                3,000,000 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
 
                              -------------------
 
                                   PROSPECTUS
 
                              -------------------
 
                     Vector Securities International, Inc.
 
                              Salomon Brothers Inc
 
                               UBS Securities LLC
 
   
                                  MAY 3, 1996
    
 
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