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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
   
                                  FORM 10-K/A
    
   
                                AMENDMENT NO. 3
    
 
/X/  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
                                    ACT OF 1934
 
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1995
 
   / /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
                               EXCHANGE ACT OF 1934
 
          FOR THE TRANSITION PERIOD FROM             TO             .
 
                         COMMISSION FILE NUMBER 0-23272
 
                           NPS PHARMACEUTICALS, INC.
             (Exact name of Registrant as specified in its charter)
 

                                   
              DELAWARE                   87-0439579
    (State or other jurisdiction      (I.R.S. Employer
 of incorporation or organization)     Identification
                                            No.)
 
  420 CHIPETA WAY, SALT LAKE CITY,       84108-1256
                UTAH
  (Address of principal executive        (Zip Code)
              offices)

 
                                 (801) 583-4939
              (Registrant's telephone number, including area code)
 
Securities registered under Section 12(b) of the Act: None
 
Securities  registered pursuant to Section 12(g) of the Act: Common Stock, $.001
Par Value
 
    Indicate by check  mark whether  the Registrant  (1) has  filed all  reports
required  to be filed by  Section 13 or 15(d) of  the Securities Exchange Act of
1934 during  the  preceding 12  months  (or for  such  shorter period  that  the
Registrant  was required to file such reports), and (2) has been subject to such
filing requirements for at least the past 90 days. YES /X/    NO / /
 
    Indicate by check mark if disclosure  of delinquent filers pursuant to  Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best  of Registrant's knowledge,  in definitive proxy  or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.    /X/   To the best of the  Company's knowledge, there have been  no
delinquent filers.
 
   
    The  approximate  aggregate  market  value  of  the  Common  Stock  held  by
nonaffiliates of the Registrant was $47,898,779 as of March 31, 1996, based upon
the closing  price  of $12.75  for  the shares  of  the Company's  Common  Stock
reported on The Nasdaq Stock Market.(1)
    
 
   
    The  number of shares of  Common Stock outstanding as  of March 31, 1996 was
8,187,232.
    
 
   
                   DOCUMENTS INCORPORATED BY REFERENCE: None
    
 
- ------------------------
   
(1)  Excludes 4,849,819 shares of Common  Stock held by directors, officers  and
     other affiliates as of March 31, 1996.
    
 
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    REGISTRANT  HEREBY  AMENDS  PART  I,  ITEM  1  BUSINESS;  PART  II,  ITEM  7
MANAGEMENT'S DISCUSSION  AND  ANALYSIS OF  FINANCIAL  CONDITION AND  RESULTS  OF
OPERATIONS AS FOLLOWS:
    
 
    WHEN  USED IN  THIS REPORT,  THE WORDS  "ESTIMATE," "PROJECT,"  "INTEND" AND
"EXPECT" AND  SIMILAR  EXPRESSIONS  ARE  INTENDED  TO  IDENTIFY  FORWARD-LOOKING
STATEMENTS.  SUCH STATEMENTS ARE  SUBJECT TO RISKS  AND UNCERTAINTIES THAT COULD
CAUSE ACTUAL RESULTS TO DIFFER MATERIALLY.  FOR A DISCUSSION OF CERTAIN OF  SUCH
RISKS,  SEE "BUSINESS -- RISK FACTORS." READERS ARE CAUTIONED NOT TO PLACE UNDUE
RELIANCE ON THESE FORWARD-LOOKING  STATEMENTS, WHICH SPEAK ONLY  AS OF THE  DATE
HEREOF.  THE COMPANY  UNDERTAKES NO  OBLIGATION TO  PUBLICLY RELEASE  UPDATES OR
REVISIONS TO THESE STATEMENTS.
 
                                     PART I
 
ITEM 1  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  or 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.
 
                                       1

   
    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."
    
 
    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.
 
                                       2

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.
    
 
   
    - 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
 
                                       3

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   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:
 


DEVELOPMENT PROGRAM     MOLECULAR TARGET      COMPOUND/STATUS      COMMERCIAL RIGHTS
- --------------------  --------------------  --------------------  --------------------
HYPERPARATHYROIDISM
                                                         
  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."

 
                                       4

  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 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."
    
 
                                [LOGO]
 

                                            
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.

 
   
    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
    
 
                                       5

   
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.
    
 
   
    STATUS OF  CLINICAL  TRIALS.    The chart  below  summarizes  the  Company's
Norcalcin clinical trials conducted to date:
    
 
   


                                                       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
                                                          
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

    
 
   
    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.
 
                                       6

    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.
 
    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.
 
                                       7

                                     [LOGO]
 
     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.
 
                                     [LOGO]
 
    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.
 
                                       8

 
   
    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.
    
 
   
                                     [LOGO]
 
    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,
 
                                       9

that  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
 
                                       10

chronic  pain often results secondarily  from a cause of  acute pain, such as an
injury, the  underlying  mechanisms 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
    
 
                                       11

   
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.
    
 
                                       12

  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 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
    
 
                                       13

   
Common  Stock at the 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 license  agreement
with  Kirin, Amgen would  receive worldwide rights  to develop and commercialize
Norcalin. 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 Norcalcin.  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 the Company's 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
    
 
                                       14

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.
 
   
    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.
 
                                       15

   
    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 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
 
                                       16

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."
 
    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.
 
                                       17

    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. 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
 
                                       18

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."
 
    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."
 
                                       19

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  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.
    
 
RISK FACTORS
 
   
    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  Licensee 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
    
 
                                       20

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.
 
   
    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 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.
 
    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
 
                                       21

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.
 
    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.
 
    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
 
                                       22

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.
 
    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,
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
 
                                       23

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.
 
   
    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  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  a  proposed
public  offering  of  2,000,000  shares  of  the  Company's  Common  Stock (plus
 
                                       24

an additional  300,000 shares  to cover  over-allotments, if  any) 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.
 
   
    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  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.
 
    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
 
                                       25

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.
    
 
   
    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
 
                                       26

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.
 
    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.
 
    ANTITAKEOVER EFFECTS  OF  CERTAIN CHARTER  AND  BYLAW PROVISIONS.    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.
 
    ABSENCE  OF DIVIDENDS.   The Company has  never paid any  cash dividends and
does not anticipate paying cash dividends in the foreseeable future.
 
   
                                    PART II
    
 
   
ITEM 7  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
 
                                       27

   
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.
    
 
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 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.
 
                                       28

    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 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  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
 
                                       29

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.
    
 
                                       30

   
                                   SIGNATURES
    
 
   
    Pursuant to  the requirements  of  Section 13  or  15(d) of  the  Securities
Exchange  Act of 1934,  the Registrant has  duly caused this  Amendment No. 3 to
Report on Form 10-K  to be signed  on its behalf  by the undersigned,  thereunto
duly authorized on the 31st day of May, 1996.
    
 
                                          REGISTRANT:
 
                                          NPS PHARMACEUTICALS, INC.
 
   
                                          By ________/s/ JAMES U. JENSEN________
                                                       James U. Jensen
                                                  VICE PRESIDENT, CORPORATE
                                                       DEVELOPMENT
                                                      AND LEGAL AFFAIRS
    
 
                                       31