NPS PHARMACEUTICALS INC
S-3/A, 1996-05-31
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 31, 1996.
    
 
   
                                                       REGISTRATION NO.
    
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- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------
   
                                AMENDMENT NO. 1
                                       TO
                                    FORM S-3
    
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                           NPS PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                         <C>
                 DELAWARE                                   87-0439579
     (State or other jurisdiction of         (I.R.S. Employer Identification Number)
      incorporation or organization)
</TABLE>
 
                           NPS PHARMACEUTICALS, INC.
                                420 CHIPETA WAY
                        SALT LAKE CITY, UTAH 84108-1256
                                 (801) 583-4939
              (Address, including zip code, and telephone number,
       including area code, of registrant's principal executive offices)
                           --------------------------
 
                                JAMES U. JENSEN
            VICE PRESIDENT, CORPORATE DEVELOPMENT AND LEGAL AFFAIRS
                           NPS PHARMACEUTICALS, INC.
                                420 CHIPETA WAY
                        SALT LAKE CITY, UTAH 84108-1256
                                 (801) 583-4939
 
           (Name, address, including zip code, and telephone number,
             including area code, of agent for service of process)
                           --------------------------
 
                                   COPIES TO:
 
   
<TABLE>
<S>                              <C>                              <C>
   KEVIN J. ONTIVEROS, ESQ.         KATHARINE A. MARTIN, ESQ.         ALAN C. MENDELSON, ESQ.
   SENIOR CORPORATE COUNSEL       PILLSBURY MADISON & SUTRO LLP        COOLEY GODWARD CASTRO
   NPS PHARMACEUTICALS, INC.           2700 SAND HILL ROAD               HUDDLESON & TATUM
        420 CHIPETA WAY               MENLO PARK, CA 94025             FIVE PALO ALTO SQUARE
     SALT LAKE CITY, UTAH                (415) 233-4500                 3000 EL CAMINO REAL
          84108-1256                                                    PALO ALTO, CA 94306
        (801) 583-4939                                                    (415) 843-5000
</TABLE>
    
 
                           --------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
     From time to time after the Registration Statement becomes effective.
                           --------------------------
 
    If  the  only securities  being registered  on this  Form are  being offered
pursuant to dividend or  interest reinvestment plans,  check the following  box.
/ /
 
    If  any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to  Rule 415 under the Securities Act  of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box: /X/
 
    If  this Form  is filed  to register  additional securities  for an offering
pursuant to Rule 462(b)  under the Securities Act,  check the following box  and
list  the  Securities Act  registration  statement number  of  earlier effective
registration statement for the same offering. / / ________________
 
    If this Form  is a  post-effective amendment  file pursuant  to Rule  462(c)
under  the Securities Act, check  the following box and  list the Securities Act
registration statement number  of the earlier  effective registration  statement
for the same offering. / / ________________
 
    If  the delivery of the  prospectus is expected to  be made pursuant to Rule
434, please check the following box. / /
 
   
    THE REGISTRANT HEREBY  AMENDS THIS  REGISTRATION STATEMENT ON  SUCH DATE  OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE  A  FURTHER  AMENDMENT  THAT  SPECIFICALLY  STATES  THAT  THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE  IN ACCORDANCE WITH SECTION 8(A)  OF
THE  SECURITIES ACT  OF 1933  OR UNTIL  THE REGISTRATION  STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION  8(A),
MAY DETERMINE.
    
 
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<PAGE>
 
PROSPECTUS
                                1,000,000 SHARES
 
                                   [NPS LOGO]
 
                                  COMMON STOCK
                                ----------------
 
    The  1,000,000 shares  (the "Shares") of  Common Stock, par  value $.001 per
share (the "Common Stock"), of NPS Pharmaceuticals, Inc. (the "Company") offered
hereby are being offered for the  account of a certain Selling Stockholder  (the
"Selling  Stockholder"). The Company will not receive any proceeds from the sale
of such securities. See "Selling Stockholder."
 
    The Selling Stockholder may sell the Shares offered hereby from time to time
on the  Nasdaq  Stock Market  or  such  other national  securities  exchange  or
automated  inter-dealer quotation system on which Shares of the Company's Common
Stock are then listed,  through negotiated transactions  or otherwise at  market
prices  prevailing at the time of the  sale or at negotiated prices. The Selling
Stockholder directly or through agents designated from time to time, or  through
underwriters, brokers or dealers also to be designated, may sell the Shares from
time  to time on terms to be determined  at the time of sale. Such underwriters,
brokers or  dealers may  receive  compensation in  the  form of  commissions  or
otherwise  in such amounts as may be negotiated  by them. As of the date of this
Prospectus, no agreements have been  reached for the sale  of the Shares or  the
amount  of any compensation  to be paid  to underwriters, brokers  or dealers in
connection  therewith.  The  Company  will  bear  all  expenses,  including  the
reasonable  fees and expenses of one legal  counsel incurred after the filing of
the Form S-3  Registration Statement,  in connection with  the registration  and
sale  of the Shares being offered by  the Selling Stockholder hereby, other than
commissions, concessions or  discounts to  underwriters, brokers  or dealers  or
other advisors to the Selling Stockholders. See "Plan of Distribution."
 
   
    The  Common Stock of the Company is  quoted on the Nasdaq Stock Market under
the trading symbol "NPSP." On May 30, 1996, the last reported sales price of the
Company's Common Stock on the Nasdaq Stock Market was $16.75 per share.
    
 
THESE SECURITIES INVOLVE A HIGH DEGREE OF RISK. SEE "RISK FACTORS," BEGINNING ON
                                    PAGE 5.
                              -------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES  AND
  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS THE
    COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY
      OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE  CONTRARY
                             IS A CRIMINAL OFFENSE.
 
   
                   The date of this Prospectus is May  , 1996
    
 
                                       1
<PAGE>
    NO  PERSON HAS BEEN AUTHORIZED IN CONNECTION  WITH THIS OFFERING TO GIVE ANY
INFORMATION OR  TO MAKE  ANY  REPRESENTATION NOT  CONTAINED OR  INCORPORATED  BY
REFERENCE  IN  THIS  PROSPECTUS  AND,  IF GIVEN  OR  MADE,  SUCH  INFORMATION OR
REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY.
NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALES HEREUNDER SHALL UNDER  ANY
CIRCUMSTANCES  CREATE ANY IMPLICATION  THAT THE INFORMATION  CONTAINED HEREIN IS
CORRECT AS OF ANY TIME  SUBSEQUENT TO THE DATE HEREOF  OR THE DATES AS OF  WHICH
INFORMATION  IS OTHERWISE  SET FORTH OR  INCORPORATED BY  REFERENCE HEREIN. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SALE OR A SOLICITATION OF AN OFFER TO
PURCHASE ANY SECURITIES OTHER THAN THOSE TO WHICH IT RELATES OR AN OFFER TO  ANY
PERSON IN ANY JURISDICTION WHERE SUCH OFFER OR SOLICITATION WOULD BE UNLAWFUL.
 
                             AVAILABLE INFORMATION
 
    The  Company is  subject to the  information requirements  of the Securities
Exchange Act of  1934, as amended,  and in accordance  therewith files  reports,
proxy  statements  and  other  information  with  the  Securities  and  Exchange
Commission  (the  "Commission").  Such  reports,  proxy  statements  and   other
information  can be inspected and copied at  the Public Reference Section of the
Commission at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549; and  at
the Commission's regional offices at Northwestern Atrium Center, Suite 1400, 500
West  Madison Street, Chicago, Illinois 60601 and 14th Floor, 75 Park Place, New
York, New York 10007. Copies  of such material can  be obtained from the  Public
Reference  Section of the Commission at 450 Fifth Street, N.W., Washington, D.C.
20549 at prescribed rates.
 
    The Company has filed with the  Commission a Registration Statement on  Form
S-3  under the Securities Act  of 1933, as amended,  (the "Securities Act") with
respect to the shares of Common  Stock offered hereby. This Prospectus does  not
contain  all of the information set forth  in the Registration Statement and the
exhibits and  schedules thereto.  For further  information with  respect to  the
Company  and  the  Common  Stock  offered  hereby,  reference  is  made  to such
Registration Statement  and  to  the exhibits  and  schedules  filed  therewith.
Statements  contained in this Prospectus  as to the contents  of any contract or
other document referred  to are not  necessarily complete and  in each  instance
reference  is made to  the copy of such  contract or other  document filed as an
exhibit to the Registration Statement. The Registration Statement, together with
the exhibits  and schedules  thereto, may  be inspected  without charge  at  the
offices  of the Commission at 450 Fifth  Street, N.W., Washington, D.C. 20549 or
at its regional offices  located at 500 West  Madison Street, Chicago,  Illinois
60661  and 14th Floor, 75  Park Place, New York, New  York 10007. Copies of such
material may be obtained from the Public Reference Section of the Commission  at
450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed rates.
 
                          REPORTS TO SECURITY HOLDERS
 
    The  Company  furnishes  its  stockholders  with  annual  reports containing
audited financial statements certified by its independent auditors and quarterly
reports containing unaudited financial information for the first three  quarters
of each fiscal year.
 
                           INCORPORATION BY REFERENCE
 
    The  following documents which have been filed with the SEC are incorporated
herein by reference:
 
        (1) The Company's Annual Report on  Form 10-K for the fiscal year  ended
    December 31, 1995;
 
   
        (2)  Amendment No. 1 to the Company's Annual Report on Form 10-K for the
    fiscal year ended December 31, 1995;
    
 
   
        (3) Amendment No. 2 to the Company's Annual Report on Form 10-K for  the
    fiscal year ended December 31, 1995;
    
 
                                       2
<PAGE>
   
        (4)  Amendment No. 3 to the Company's Annual Report on Form 10-K for the
    fiscal year ended December 31, 1995;
    
 
   
        (5) The Company's Registration Statement on Form 8-A dated May 19,  1994
    as filed with the Commission on May 23, 1994.
    
 
    All  documents filed by the Company pursuant  to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering made  hereby shall be deemed to be  incorporated
by  reference in this  Prospectus and to be  a part hereof from  the date of the
filing of  such  documents. Any  statement  contained in  this  Prospectus,  any
supplement  to this  Prospectus or  in a document  incorporated or  deemed to be
incorporated by reference herein, shall be  deemed to be modified or  superseded
for purposes of this Prospectus to the extent that a statement contained herein,
or  in any subsequently filed  supplement to this Prospectus  or in any document
that is also is or is deemed to be incorporated by reference herein, modifies or
supersedes such statement. Any statement so modified or superseded shall not  be
deemed,  except  as so  modified or  superseded,  to constitute  a part  of this
Prospectus.
 
    The Company  will furnish,  upon  written or  oral  request of  any  person,
without  charge, a copy of any document or part thereof which is incorporated by
reference in this Prospectus but not delivered herewith (not including  exhibits
to  the information that  is incorporated by reference  unless such exhibits are
specifically incorporated by reference into the information that this Prospectus
incorporates). Requests for information should  be directed to James U.  Jensen,
Vice President, Corporate Development and Legal Affairs and Corporate Secretary,
NPS  Pharmaceuticals,  Inc.,  420  Chipeta  Way,  Salt  Lake  City,  Utah 84108;
telephone (801) 583-4939.
 
                                       3
<PAGE>
                                  THE COMPANY
 
   
    NPS  Pharmaceuticals is engaged  in the discovery  and development of orally
active, small  molecule  drugs  that  target  cell  surface  receptors  and  ion
channels.  The Company's most advanced  product candidate, Norcalcin-TM- for the
treatment of hyperparathyroidism  ("HPT"), arose from  the Company's  pioneering
work  on  a  new  class  of  cell  surface  receptors  which  detect  levels  of
extracellular calcium  involved  in  numerous bodily  functions.  To  date,  the
Company  has  conducted  two Phase  I  and  two Phase  I/II  clinical  trials of
Norcalcin to test its safety and initial efficacy. The Company is also  applying
its   calcium  receptor   technology  to   the  development   of  therapies  for
osteoporosis. The  Company's  other main  programs  involve the  development  of
orally  active, small molecule  drugs which have  neuroprotectant properties and
target certain calcium channels in order to provide treatments for stroke,  head
trauma, chronic pain and epilepsy. Additionally, the Company is pursuing several
discovery  programs which are extensions of its discoveries in calcium receptors
and ion channels.
    
 
    NPS was incorporated in Utah in 1986 and reincorporated in Delaware in 1992.
The Company's executive offices are located at 420 Chipeta Way, Salt Lake  City,
Utah 84108-1256, and its telephone number is (801) 583-4939.
 
    THIS   PROSPECTUS   CONTAINS,   IN  ADDITION   TO   HISTORICAL  INFORMATION,
FORWARD-LOOKING STATEMENTS THAT INVOLVE  RISKS AND UNCERTAINTIES. THE  COMPANY'S
ACTUAL  RESULTS OR EXPERIENCE COULD DIFFER SIGNIFICANTLY FROM THOSE DISCUSSED IN
THE FORWARD-LOOKING STATEMENTS. FACTORS THAT  COULD CAUSE OR CONTRIBUTE TO  SUCH
DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED IN "RISK FACTORS."
 
                                  RISK FACTORS
 
    THE  FOLLOWING FACTORS SHOULD BE CONSIDERED CAREFULLY BY POTENTIAL INVESTORS
IN EVALUATING AN INVESTMENT IN THE SHARES OF COMMON STOCK OFFERED HEREBY.
 
   
    EARLY STAGE OF PRODUCT  DEVELOPMENT; DEPENDENCE ON  NORCALCIN.  The  Company
was founded in 1986, and has not completed development of any drugs and does not
expect  that  any  drugs  resulting  from its  or  its  Licensees'  research and
development efforts will be commercially available for several years, if at all.
Norcalcin is  the only  product  candidate currently  under development  by  the
Company  and its Licensees that  is in human clinical  trials. No other compound
under development  by NPS  or  its Licensees  has  been scheduled  for  clinical
testing.  Clinical trials in humans are necessary  to determine whether or not a
compound will  be a  safe, commercially  attractive or  effective drug.  Results
obtained  in preclinical trials  are not necessarily  indicative of results that
will be obtained in later stages of preclinical development or in human clinical
testing. All  product candidates  developed  by the  Company or  its  Licensees,
including   Norcalcin,   will  require   extensive  research,   development  and
preclinical  and  clinical  testing  prior  to  submission  of  any   regulatory
application,  as well as a lengthy  regulatory approval process. Preclinical and
clinical testing  of  safety and  efficacy  takes  several years  and  the  time
required  to commercialize new drugs cannot  be predicted with accuracy. Product
development of  new  pharmaceuticals  is  highly  uncertain,  and  unanticipated
developments,  clinical or regulatory delays, unexpected adverse side effects or
inadequate therapeutic efficacy  could slow or  prevent the product  development
efforts  of the Company and its Licensees,  and have a materially adverse effect
on the  Company's operations.  There  can be  no  assurance that  the  Company's
current   product  candidates,  including  Norcalcin,   or  any  future  product
candidates, will  advance to  clinical trials,  prove safe  and effective,  meet
applicable  regulatory  standards, be  capable of  being produced  in commercial
quantities at acceptable cost or be successfully marketed. Also, there can be no
assurance that a pharmacological method  for the treatment of diseases  targeted
by  the Company, including HPT, will prove to be superior to non-pharmacological
treatments. See "-- Government Regulation; No Assurance of Regulatory Approval."
    
 
    DEPENDENCE  ON  COLLABORATIVE  RESEARCH  AND  LICENSE  RELATIONSHIPS.    The
Company's  strategy for the development,  clinical testing and manufacturing and
commercialization of  certain of  its product  candidates and  the research  and
development   of  new   product  candidates   includes  entering   into  various
 
                                       4
<PAGE>
   
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  Kirin,  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 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.
 
                                       5
<PAGE>
    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  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
 
                                       6
<PAGE>
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 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.
 
                                       7
<PAGE>
    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  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
 
                                       8
<PAGE>
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.
    
 
   
    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 such  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  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
 
                                       9
<PAGE>
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 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
 
                                       10
<PAGE>
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 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.
 
                                       11
<PAGE>
                                USE OF PROCEEDS
 
    The  Company will  not receive  any part  of the  proceeds from  the sale of
shares by the Selling Stockholder.
 
                              SELLING STOCKHOLDER
 
   
    As of May 20, 1996, the Selling Stockholder beneficially owned 8.59% of  the
outstanding  common stock  of the Company.  Set forth  below is the  name of the
Selling Stockholder, the number of shares  of common stock owned by the  Selling
Stockholder as of the effective date of this Prospectus, the number of shares of
common  stock that may  be offered by  the Selling Stockholder  pursuant to this
Prospectus, and the number of shares of  common stock and the percentage of  the
outstanding  shares of common stock to be  owned by the Selling Stockholder upon
completion of the offering  if all the shares  owned by the Selling  Stockholder
are  sold. Any or all of the shares listed  below may be offered for sale by the
Selling  Stockholder  from  time  to  time.  The  Company  has  entered  into  a
Development and License Agreement with the Selling Stockholder.
    
 
   
<TABLE>
<CAPTION>
                                                                       PERCENT OF COMMON
                 SHARES OWNED                                             STOCK OWNED       PERCENT OF COMMON
   SELLING         PRIOR TO     SHARES OFFERED   SHARES OWNED AFTER         BEFORE          STOCK OWNED AFTER
 STOCKHOLDER       OFFERING         HEREBY          OFFERING (1)         OFFERING (2)         OFFERING (1)
- --------------  --------------  --------------  ---------------------  -----------------  ---------------------
<S>             <C>             <C>             <C>                    <C>                <C>
Amgen Inc.          1,000,000      1,000,000                  0                8.59%                   0%
</TABLE>
    
 
- --------------
(1) Assumes  no other disposition  or other acquisition of  common stock and all
    shares included herein are sold.
 
   
(2) As of May 20, 1996.
    
 
                              PLAN OF DISTRIBUTION
 
    The Company will not receive any proceeds  from the sale of shares owned  by
the  Selling Stockholder.  It is anticipated  that the  Selling Stockholder will
offer the shares in the manner set  forth on the cover page of this  Prospectus,
from  time to time,  directly or through broker/dealers  or underwriters who act
solely as agents or  maybe acquired the  shares as principals,  in all cases  as
designated  by the Selling  Stockholder. Sales may  be made on  the Nasdaq Stock
Market or  such other  national securities  exchange or  automated  inter-dealer
quotation systems on what shares of common stock are then listed, to negotiate a
transaction  or otherwise at  prices and at  terms then prevailing  or at prices
related to  the then-current  market price  or in  negotiated transactions.  The
shares may be sold pursuant to one or more of the following:
 
    (a)  ordinary brokerage  transactions and  transactions in  which the broker
solicits purchasers;
 
    (b) purchasers by  an underwriter,  a broker or  a dealer  as principal  and
resale  by such underwriter, broker  or dealer for its  account pursuant to this
Prospectus;
 
    (c) a block trade in which the  broker or dealer so engaged will attempt  to
sell  the shares as agent, but may position and resale a portion of the block as
principal to facilitate the transaction;
 
    (d) an exchange distribution in accordance with the rules of such  exchange;
and
 
    (e) through the writing of options on the shares.
 
    If  necessary, a supplement prospectus that  describes the method of sale in
greater detail may be filed by the Company with the Commission pursuant to  Rule
424(c)  under  the 1933  Act under  certain  circumstances. In  effecting sales,
underwriters, brokers  or dealers  engaged  by the  Selling Stockholder  of  the
shares  may arrange for  other underwriters, brokers  or dealers to participate.
Underwriters, brokers  or  dealers  will  receive  commissions,  concessions  or
discounts from the Selling Stockholder, the amount to
 
                                       12
<PAGE>
be  negotiated  prior to  the  sale. In  addition,  any shares  covered  by this
Prospectus that qualify for sale pursuant to Rule 144 under the 1933 Act may  be
sold under Rule 144 rather than pursuant to this Prospectus.
 
    The  Company  will  bear all  expenses  (including the  reasonable  fees and
expenses of one  legal counsel for  the Selling Stockholder  incurred after  the
date  of filing of the  Form S-3 Registration Statement)  in connection with the
registration and  sale of  the shares,  other than  commissions, concessions  or
discounts  to underwriters, brokers and dealers,  and fees and expenses of other
advisors to the Selling Stockholder.
 
    This Registration Statement  is filed  pursuant to  the terms  of the  Stock
Purchase  Agreement, dated March  18, 1996, between the  Company and the Selling
Stockholder under which the  Company has agreed to  file a "shelf"  registration
statement  pursuant to Rule 415 under the Securities Act covering all the shares
of  common  stock  issued  to  the  Selling  Stockholder  and  to  maintain  the
effectiveness  of the  Form S-3  Registration Statement  for no  less than three
years from the date of execution of the Stock Purchase Agreement.
 
    To comply with the securities laws of certain jurisdictions, the  securities
offered  hereby  may  be  offered  or sold  in  such  jurisdiction  only through
registered  or   licensed  brokers   or  dealers.   In  addition,   in   certain
jurisdictions,  the securities offered hereby may  not be offered or sold unless
they have been  registered or  qualified for sale  in such  jurisdictions or  an
exemption from registration or qualification is available and is complied with.
 
                                 LEGAL MATTERS
 
    The  legality of the shares offered hereby has been passed upon by Pillsbury
Madison & Sutro LLP, Menlo Park, California, counsel to the Company.
 
                                    EXPERTS
 
    The financial statements of the Company, a development stage company, as  of
December  31, 1994 and 1995, and for each  of the years in the three-year period
ending December 31, 1995, and for  the period from October 22, 1986  (inception)
through  December 31, 1995, is incorporated by reference herein and elsewhere in
the Registration Statement in reliance upon the report of KPMG Peat Marwick LLP,
independent certified public accountants, incorporated by reference herein,  and
upon  the  authority  of  said  accounting firm  as  experts  in  accounting and
auditing.
 
                                       13
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
<TABLE>
<S>                                                                          <C>
Securities and Exchange Commission Registration Fee........................  $   4,741
Nasdaq Stock Market Listing Fee............................................  $  17,500
Accountant's Fees and Expenses.............................................  $   5,000
Legal Fees and Expenses....................................................  $   5,000
Blue Sky Fees and Expenses.................................................  $   1,000
Miscellaneous Expenses.....................................................  $      59
                                                                             ---------
Total......................................................................  $  33,600
                                                                             ---------
                                                                             ---------
</TABLE>
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    Under  Section 145 of  the Delaware General  Corporation Law, the Registrant
has broad powers  to indemnify  its directors and  officers against  liabilities
they  may incur in  such capacities, including  liabilities under the Securities
Act of 1933,  as amended (the  "Securities Act"). The  Registrant's Bylaws  also
provide  that the Registrant will indemnify its directors and executive officers
and may indemnify its other officers, employees and other agents to the  fullest
extent not prohibited by Delaware law.
 
    The  Registrant's Certificate of Incorporation  provides for the elimination
of liability for monetary damages for breach of the directors' fiduciary duty of
care to the Registrant and its  stockholders. These provisions do not  eliminate
the  directors'  duty  of  care  and,  in  appropriate  circumstances, equitable
remedies such as injunctive  or other forms of  non-monetary relief will  remain
available  under Delaware  law. In addition,  each director will  continue to be
subject to  liability  for breach  of  the director's  duty  of loyalty  to  the
Registrant,  for acts  or omissions not  in good faith  or involving intentional
misconduct, for knowing violations  of law, for any  transaction from which  the
director  derived an improper  personal benefit and for  payment of dividends or
approval of stock repurchases  or redemptions that  are unlawful under  Delaware
law. The provision does not affect a director's responsibilities under any other
laws,  such as  the federal  securities laws  or state  or federal environmental
laws.
 
    The Registrant has entered into agreements with its directors and  executive
officers that require the Registrant to indemnify such persons against expenses,
judgments, fines, settlements and other amounts actually and reasonably incurred
(including  expenses of a derivative action)  in connection with any proceeding,
whether actual or threatened, to  which any such person may  be made a party  by
reason  of the  fact that such  person is  or was a  director or  officer of the
Registrant or any of its affiliated  enterprises, provided such person acted  in
good  faith and  in a  manner such person  reasonably believed  to be  in or not
opposed to  the  best interests  of  the Registrant  and,  with respect  to  any
criminal  proceeding, had no reasonable cause to  believe his or her conduct was
unlawful. The indemnification agreements also set forth certain procedures  that
will apply in the event of a claim for indemnification thereunder.
 
                                      II-1
<PAGE>
ITEM 16.  EXHIBITS.
 
   
<TABLE>
<CAPTION>
 EXHIBIT NO.                                                DESCRIPTION
- -------------  -----------------------------------------------------------------------------------------------------
<S>            <C>
        4.1    Amended and Restated Certificate of Incorporation (1)
        4.2    Amended and Restated Bylaws (1)
        5.1    Opinion of Pillsbury Madison & Sutro LLP
      10.17    Stock Purchase Agreement between NPS Pharmaceuticals, Inc. and Amgen Inc. dated March 18, 1996 (2)
       23.1    Consent of KPMG Peat Marwick LLP
       23.2    Consent of Pillsbury Madison & Sutro LLP (included in Exhibit 5.1)
       24.1    Power of Attorney (3)
</TABLE>
    
 
- --------------
 
   
(1)  Incorporated herein by reference to the Registration Statement on Form S-1,
    filed January 21, 1994, or amendments thereto (file number 33-74318).
    
 
   
(2) Incorporated herein by reference to Amendment No. 1 to the Company's  Annual
    Report on Form 10-K for the fiscal year ended December 31, 1995.
    
 
   
(3) Previously filed.
    
 
ITEM 17.  UNDERTAKINGS.
 
    A.  RULE 415 OFFERING.
 
    The undersigned Registrant hereby undertakes:
 
        (1)  To file, during any period in which offers or sales are being made,
    a post-effective amendment to this Registration Statement:
 
            (i) to include any  Prospectus required by  Section 10(a)(3) of  the
       Securities Act of 1933 (the "Act");
 
           (ii)  to reflect in the Prospectus  any facts or events arising after
       the effective  date of  the Registration  Statement (or  the most  recent
       post-effective   amendment  thereof)   which,  individually   or  in  the
       aggregate, represent a fundamental change in the information set forth in
       the Registration Statement;
 
           (iii) to include any material information with respect to the Plan of
       Distribution not previously  disclosed in the  Registration Statement  or
       any material change to such information in the Registration Statement;
 
       provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
       information  required  to be  included in  a post-effective  amendment by
       those paragraphs is contained in periodic reports filed by the Registrant
       pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of
       1934 that are incorporated by reference in the Registration Statement.
 
        (2) That,  for  the  purpose  of determining  any  liability  under  the
    Securities  Act of 1933, each such  post-effective amendment shall be deemed
    to be  a  new registration  statement  relating to  the  securities  offered
    therein, and the offering of such securities at that time shall be deemed to
    be the initial bona fide offering thereof.
 
        (3)  To remove from registration by  means of a post-effective amendment
    any of the securities being registered that remain unsold at the termination
    of the offering.
 
    B.  SUBSEQUENT DOCUMENTS INCORPORATED BY REFERENCE.
 
    The  undersigned  Registrant  hereby   undertakes  that,  for  purposes   of
determining  any liability under the Securities Act  of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or
 
                                      II-2
<PAGE>
Section 15(d) of  the Securities Exchange  Act of 1934  that is incorporated  by
reference in the registration statement shall be deemed to be a new registration
statement  relating to the securities offered  therein, and the offering of such
securities at that time  shall be deemed  to be the  initial bona fide  offering
thereof.
 
    C.  INDEMNIFICATION OF OFFICERS, DIRECTORS AND CONTROLLING PERSONS.
 
    Insofar  as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to  directors, officers and controlling persons of  the
Registrant  pursuant to the  foregoing provisions, or  otherwise, the Registrant
has been advised that in the  opinion of the Securities and Exchange  Commission
such  indemnification is against public  policy as expressed in  the Act and is,
therefore, unenforceable. In the event that a claim for indemnification  against
such  liabilities (other than the payment by the Registrant of expenses incurred
or paid by a director,  officer or controlling person  of the Registrant in  the
successful  defense  of any  action,  suit or  proceeding)  is asserted  by such
director, officer or controlling person in connection with the securities  being
registered, the Registrant will, unless in the opinion of its counsel the matter
has  been settled  by controlling  precedent, submit  to a  court of appropriate
jurisdiction the question whether such  indemnification by it is against  public
policy as expressed in the act and will be governed by the final adjudication of
such issue.
 
                                      II-3
<PAGE>
                                   SIGNATURES
 
   
    Pursuant  to the requirements of the  Securities Act of 1933, the Registrant
has duly caused this Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Salt  Lake,
State of Utah, on May 31, 1996.
    
 
                                          NPS PHARMACEUTICALS, INC.
 
                                          By          /s/ HUNTER JACKSON
 
                                            ------------------------------------
                                                   Hunter Jackson, Ph.D.
                                             PRESIDENT, CHIEF EXECUTIVE OFFICER
                                                 AND CHAIRMAN OF THE BOARD
 
    Pursuant   to  the  requirements  of  the   Securities  Act  of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                          TITLE                         DATE
- ------------------------------------------------------  ----------------------------------------  ---------------
<C>                                                     <S>                                       <C>
                        /s/ HUNTER JACKSON              President, Chief Executive Officer and
     -------------------------------------------         Chairman of the Board (Principal            May 31, 1996
                Hunter Jackson, Ph.D.                    Executive Officer)
 
                     /s/ ROBERT K. MERRELL*             Vice President, Finance, Chief Financial
     -------------------------------------------         Officer and Treasurer (Principal            May 31, 1996
                  Robert K. Merrell                      Financial and Accounting Officer)
 
                       /s/ JAMES U. JENSEN              Vice President, Corporate Development
     -------------------------------------------         and Legal Affairs, Secretary and            May 31, 1996
                   James U. Jensen                       Director
 
                        /s/ SANTO J. COSTA*
     -------------------------------------------        Director                                     May 31, 1996
                    Santo J. Costa
 
                    /s/ JAMES G. GRONINGER*
     -------------------------------------------        Director                                     May 31, 1996
                  James G. Groninger
 
                      /s/ DONALD E. KUHLA*
     -------------------------------------------        Director                                     May 31, 1996
                Donald E. Kuhla, Ph.D.
 
                       /s/ THOMAS N. PARKS*
     -------------------------------------------        Director                                     May 31, 1996
                Thomas N. Parks, Ph.D.
 
                           /s/ DOUG REED*
     -------------------------------------------        Director                                     May 31, 1996
                   Doug Reed, M.D.
 
                       /s/ TIMOTHY J. RINK*
     -------------------------------------------        Director                                     May 31, 1996
             Timothy J. Rink, M.D., Sc.D.
 
                         /s/ JESSE L. TREU*
     -------------------------------------------        Director                                     May 31, 1996
                 Jesse L. Treu, Ph.D.
 
          *By           /s/ JAMES U. JENSEN
        --------------------------------------
                   James U. Jensen
                   ATTORNEY-IN-FACT
</TABLE>
    
 
                                      II-4
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT NO.                                           DESCRIPTION                                             PAGE
- -------------  --------------------------------------------------------------------------------------------  ---------
<S>            <C>                                                                                           <C>
        4.1    Amended and Restated Certificate of Incorporation (1).......................................
        4.2    Amended and Restated Bylaws (1).............................................................
        5.1    Opinion of Pillsbury Madison & Sutro LLP....................................................
      10.17    Stock Purchase Agreement between NPS Pharmaceuticals, Inc. and Amgen Inc. dated March 18,
               1996 (2)....................................................................................
       23.1    Consent of KPMG Peat Marwick LLP............................................................
       23.2    Consent of Pillsbury Madison & Sutro LLP (included in Exhibit 5.1)..........................
       24.1    Power of Attorney (3).......................................................................
</TABLE>
    
 
- --------------
 
   
(1)  Incorporated herein by reference to the Registration Statement on Form S-1,
    filed January 21, 1994, or amendments thereto (file number 33-74318).
    
 
   
(2) Incorporated herein  by reference to  the Amendment No.  1 to the  Company's
    Annual Report on Form 10-K for the fiscal year ended December 31, 1995.
    
 
   
(3) Previously filed.
    

<PAGE>
                                                                   Exhibit 5.1


                                [Letterhead]
                               LAW OFFICES OF 
                       PILLSBURY MADISON & SUTRO LLP
                             POST OFFICE BOX 7880
                      SAN FRANCISCO, CALIFORNIA 94120
                          TELEPHONE (415) 983-1000
                          FACSIMILE (415) 983-1200


                                May 28, 1996



NPS Pharmaceuticals, Inc.
420 Chipeta Way
Salt Lake City, Utah 84108-1256


     Re:   Registration Statement on Form S-3 (File No. 333-02564)


Ladies and Gentlemen:

     We are acting as counsel for NPS Pharmaceuticals, Inc., a Delaware 
corporation (the "Company"), in connection with the registration under the 
Securities Act of 1933, as amended, of 1,000,000 shares of Common Stock, par 
value $.001 per share (the "Common Stock"), of the Company, previously 
issued by the Company to a certain current stockholder (the "Selling 
Stockholder"). The Common Stock will be offered and sold by the Selling 
Stockholder. In this regard we have participated in the preparation of a 
Registration Statement on Form S-3 (File No. 333-02564) relating to such 
shares of Common Stock. Such Registration Statement, as amended, is herein 
referred to as the "Registration Statement."

     We are of the opinion that the shares of Common Stock to be offered and 
sold by the Selling Stockholder have been duly authorized and are legally 
issued, fully paid and nonassessable.

     We hereby consent to the filing of this opinion as Exhibit 5.1 to the 
Registration Statement and to the use of our name under the caption "Legal 
Matters" in the Registration Statement and in the Prospectus included therein.



                                       Very truly yours,


                                       /s/  Pillsbury Madison & Sutro LLP




<PAGE>
                                                                    EXHIBIT 23.1
 
                        CONSENT OF INDEPENDENT AUDITORS
 
The Board of Directors
NPS Pharmaceuticals, Inc.:
 
    We  consent to incorporation by reference  in this Registration Statement on
Form S-3 of our report dated February 7, 1996, except as to note 11 which is  as
of  March 18, 1996, relating to the  balance sheets of NPS Pharmaceuticals, Inc.
as of December  31, 1995  and 1994, and  the related  statements of  operations,
stockholders'  equity, and cash  flows for each  of the years  in the three-year
period ended  December  31, 1995,  and  for the  period  from October  22,  1986
(inception)  through December 31, 1995, which report appears in the December 31,
1995, annual report on Form 10-K of NPS Pharmaceuticals, Inc.
 
                                          KPMG PEAT MARWICK LLP
 
Salt Lake City, Utah
May 31, 1996


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