SILICON GRAPHICS INC /CA/
S-4, 1996-05-10
ELECTRONIC COMPUTERS
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<PAGE>
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 10, 1996
 
                                                       REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                             SILICON GRAPHICS, INC.
           (Exact name of the Registrant as specified in its charter)
 
<TABLE>
<S>                              <C>                            <C>
           DELAWARE                          3573                  94-2789662
 (State or other jurisdiction    (Primary Standard Industrial   (I.R.S. Employer
     of incorporation or         Classification Code Number)     Identification
        organization)                                                 No.)
</TABLE>
 
                         2011 NORTH SHORELINE BOULEVARD
                      MOUNTAIN VIEW, CALIFORNIA 94043-1389
                                 (415) 960-1980
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                            ------------------------
 
                                WILLIAM M. KELLY
      VICE PRESIDENT, BUSINESS DEVELOPMENT, GENERAL COUNSEL AND SECRETARY
                             SILICON GRAPHICS, INC.
                         2011 NORTH SHORELINE BOULEVARD
                      MOUNTAIN VIEW, CALIFORNIA 94043-1389
                                 (415) 960-1980
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                       <C>
          MICHAEL J. KENNEDY                         DANIEL R. KAPLAN
         Shearman & Sterling              Proskauer Rose Goetz & Mendelsohn, LLP
        555 California Street                         1585 Broadway
   San Francisco, California 94104               New York, New York 10036
            (415) 616-1100                            (212) 969-3200
</TABLE>
 
                            ------------------------
 
    APPROXIMATE  DATE OF  COMMENCEMENT OF  PROPOSED SALE  TO PUBLIC:  As soon as
practicable after the Registration Statement becomes effective and certain other
conditions under the Merger Agreement are met or waived.
 
    If the  securities  being registered  on  this  Form are  being  offered  in
connection  with the formation of a holding company and there is compliance with
General Instruction G, check the following box. / /
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
                                                           PROPOSED         PROPOSED
                                                            MAXIMUM          MAXIMUM         AMOUNT OF
       TITLE OF EACH CLASS OF             AMOUNT TO     OFFERING PRICE      AGGREGATE      REGISTRATION
   SECURITIES TO BE REGISTERED (1)      BE REGISTERED      PER SHARE     OFFERING PRICE         FEE
<S>                                    <C>              <C>              <C>              <C>
Common Stock, $0.001 par value
 (including associated Preferred         11,245,000
 Share Purchase Rights)..............     Shares(2)        $27.44(3)     $308,562,800(3)    $73,398(3)
</TABLE>
 
(1) This Registration Statement relates to securities of the Registrant issuable
    to holders of Common  Stock of Cray Research,  Inc., a Delaware  corporation
    ("Cray"),  in the proposed merger of Cray  with a wholly owned subsidiary of
    the Registrant.
 
(2) Represents  the  maximum  number  of  shares of  the  Common  Stock  of  the
    Registrant  which  may be  issued to  shareholders of  Cray pursuant  to the
    Merger described herein.
 
(3) Pursuant to Rule 457(f), the registration  fee was computed on the basis  of
    the  average of the high and low prices of Cray Common Stock on the New York
    Stock Exchange on May 8, 1996. $33,003  was paid under Section 14(g) of  the
    Securities Exchange Act of 1934 in connection with the filing of preliminary
    proxy  materials on April  5, 1996. Therefore,  the registration fee payable
    upon the filing of this Registration Statement is $73,398.
                            ------------------------
 
    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  WHICH 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.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                             CROSS REFERENCE SHEET
 
                   PURSUANT TO ITEM 501(B) OF REGULATION S-K
                 SHOWING THE LOCATION IN THE PROSPECTUS OF THE
                   INFORMATION REQUIRED BY PART I OF FORM S-4
 
<TABLE>
<CAPTION>
S-4 ITEM NUMBER AND CAPTION                                                            PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
A.  INFORMATION ABOUT THE TRANSACTION
       1.  Forepart of the Registration Statement and Outside
            Front Cover Page of Prospectus;.....................  Facing Page; Cross Reference Sheet; Outside Front
                                                                   Cover Page of Proxy Statement/ Prospectus
 
       2.  Inside Front and Outside Back Cover Pages of
            Prospectus..........................................  Table of Contents; Available Information;
                                                                   Incorporation of Certain Documents by Reference
 
       3.  Risk Factors, Ratio of Earnings to Fixed Charges and
            Other Information...................................  Summary; Selected Historical and Pro Forma Financial
                                                                   Data; Comparative per Share Data; Market Price and
                                                                   Dividend Information; Pro Forma Combined Condensed
                                                                   Financial Information; Risk Factors; The Merger; The
                                                                   Merger Agreement and Related Agreements
 
       4.  Terms of the Transaction.............................  Summary; The Merger; The Merger Agreement and Related
                                                                   Agreements; Comparison of Stockholders' Rights
 
       5.  Pro Forma Financial Information......................  Selected Historical and Pro Forma Financial Data; Pro
                                                                   Forma Combined Condensed Financial Information
 
       6.  Material Contacts with the Company Being Acquired....  Summary; The Merger; The Merger Agreement and Related
                                                                   Agreements
 
       7.  Additional Information Required for Re-Offering by
            Persons and Parties Deemed to be Underwriters.......                            *
 
       8.  Interests of Named Experts and Counsel...............                            *
 
       9.  Disclosure of Commission Position on Indemnification
            for Securities Act Liabilities......................                            *
 
B.  INFORMATION ABOUT THE REGISTRANT
 
      10.  Information with Respect to S-3 Registrants..........  Available Information; Incorporation of Certain
                                                                   Documents by Reference; Summary; The Merger; The
                                                                   Merger Agreement and Related Agreements; Market
                                                                   Price and Dividend Information; Selected Historical
                                                                   and Pro Forma Financial Data; Pro Forma Combined
                                                                   Condensed Financial Information
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
S-4 ITEM NUMBER AND CAPTION                                                            PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
      11.  Incorporation of Certain Information by Reference....  Incorporation of Certain Documents by Reference
 
      12.  Information with Respect to S-2 or S-3 Registrants...                            *
 
      13.  Incorporation of Certain Information by Reference....                            *
 
      14.  Information with Respect to Registrants Other Than
            S-3 or S-2 Registrants..............................                            *
 
C.  INFORMATION ABOUT THE COMPANY BEING ACQUIRED
 
      15.  Information with Respect to S-3 Companies............  Available Information; Incorporation of Certain
                                                                   Documents by Reference; Summary; The Merger; The
                                                                   Merger Agreement and Related Agreements; Market
                                                                   Price and Dividend Information; Selected Historical
                                                                   and Pro Forma Financial Data; Pro Forma Combined
                                                                   Condensed Financial Information
 
      16.  Information with Respect to S-2 or S-3 Companies.....                            *
 
      17.  Information with Respect to Companies Other Than S-2
            or S-3 Companies....................................                            *
 
D.  VOTING AND MANAGEMENT INFORMATION
 
      18.  Information if Proxies, Consents or Authorizations
            are to be Solicited.................................  Facing Page; Outside Front Cover Page of Proxy
                                                                   Statement/Prospectus; Summary; The Special Meeting;
                                                                   The Merger; The Merger Agreement and Related
                                                                   Agreements; Comparison of Stockholders' Rights;
                                                                   Stockholder Proposals
 
      19.  Information if Proxies, Consents or Authorizations
            are not to be Solicited or in an Exchange Offer.....                            *
</TABLE>
 
- ------------------------
*Omitted because inapplicable or answer is negative.
<PAGE>
                              CRAY RESEARCH, INC.
                              655A LONE OAK DRIVE
                             EAGAN, MINNESOTA 55121
                                  May 14, 1996
 
TO: THE STOCKHOLDERS OF CRAY RESEARCH, INC.
 
Dear Stockholder:
 
    You are cordially invited to attend a special meeting of the stockholders of
Cray  Research, Inc. ("Cray") to be held at 10:00 a.m. local time, on Wednesday,
June 26, 1996,  at Cray's  headquarters, 655  Lone Oak  Drive, Eagan,  Minnesota
55121 (the "Special Meeting").
 
    At  the  Special Meeting  you  will be  asked to  consider  and vote  on the
following proposals:
 
        1.  To approve and adopt the  Agreement and Plan of Merger (the  "Merger
    Agreement"),  dated as of February 25,  1996, by and among Silicon Graphics,
    Inc. ("Silicon  Graphics"), C  Acquisition  Corporation ("Merger  Sub")  and
    Cray,  and to approve the merger (the  "Merger") of Merger Sub with and into
    Cray pursuant to the Merger Agreement. As a result of the Merger, Cray  will
    become a wholly owned subsidiary of Silicon Graphics.
 
        2.  To approve and ratify amendments to and a restatement of Cray's 1989
    Employee Benefit Stock Plan (the "Plan Amendment").
 
        3.   To  transact such  other business as  may properly  come before the
    Special Meeting or any postponements or adjournments thereof.
 
    CRAY'S BOARD OF DIRECTORS HAS UNANIMOUSLY APPROVED THE MERGER AGREEMENT  AND
THE  TRANSACTIONS  CONTEMPLATED  THEREBY,  INCLUDING THE  MERGER,  AND  THE PLAN
AMENDMENT. AFTER  CAREFUL  CONSIDERATION,  THE BOARD  OF  DIRECTORS  UNANIMOUSLY
RECOMMENDS A VOTE IN FAVOR OF THE MERGER AND THE PLAN AMENDMENT.
 
    As  you know, the Merger is the second  and final step in the acquisition of
Cray by Silicon  Graphics pursuant  to the terms  of the  Merger Agreement.  The
first  step was the tender  offer (the "Offer") by  Merger Sub pursuant to which
Merger Sub acquired 19,218,735 shares of Cray common stock for $30.00 per  share
in cash on April 2, 1996.
 
    Upon consummation of the Merger, each of the shares of Cray common stock not
owned  by Cray, Silicon Graphics, or its  affiliates, will be converted into the
right to receive one share of common stock of Silicon Graphics.
 
    AS A RESULT OF THE  COMPLETION OF THE OFFER AND  PURCHASE OF SHARES OF  CRAY
COMMON  STOCK PURSUANT THERETO, MERGER SUB OWNS AND HAS THE RIGHT TO VOTE AT THE
CRAY SPECIAL MEETING SUFFICIENT SHARES TO  APPROVE THE MERGER AGREEMENT AND  THE
PLAN  AMENDMENT WITHOUT  THE AFFIRMATIVE VOTE  OF ANY  OTHER STOCKHOLDER THEREBY
INSURING APPROVAL OF THE MERGER AGREEMENT AND THE PLAN AMENDMENT.
 
    Details of  the proposed  Merger,  the Plan  Amendment and  other  important
information concerning Silicon Graphics and Cray are more fully described in the
accompanying Proxy Statement/ Prospectus. Please give this material your careful
attention.
<PAGE>
    Whether or not you plan to attend the Special Meeting, please complete, sign
and  date the  accompanying proxy  card and  return it  in the  enclosed prepaid
envelope. You may revoke your proxy in the manner described in the  accompanying
Proxy  Statement/Prospectus at any time before it  has been voted at the Special
Meeting. If you attend the Special Meeting,  you may vote in person even if  you
have  previously  returned  your proxy  card.  Your prompt  cooperation  will be
greatly appreciated.
 
                                          Sincerely,
 
                                          Robert H. Ewald
                                          PRESIDENT AND
                                          CHIEF OPERATING OFFICER
 
                                       2
<PAGE>
                              CRAY RESEARCH, INC.
                              655A LONE OAK DRIVE
                             EAGAN, MINNESOTA 55121
                             ---------------------
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                            TO BE HELD JUNE 26, 1996
 
TO: THE STOCKHOLDERS OF CRAY RESEARCH, INC.
 
    NOTICE IS  HEREBY GIVEN  that  a special  meeting  of stockholders  of  CRAY
RESEARCH,  INC., a  Delaware corporation ("Cray"),  will be held  at 10:00 a.m.,
local time, on Wednesday,  June 26, 1996, at  Cray's headquarters, 655 Lone  Oak
Drive, Eagan, Minnesota 55121 (the "Special Meeting"), to consider and vote upon
the following proposals:
 
        1.   To approve and adopt the  Agreement and Plan of Merger (the "Merger
    Agreement"), dated as of February 25,  1996, by and among Silicon  Graphics,
    Inc.  ("Silicon  Graphics"), C  Acquisition  Corporation ("Merger  Sub") and
    Cray, and to approve the merger (the  "Merger") of Merger Sub with and  into
    Cray  pursuant to the Merger Agreement. As a result of the Merger, Cray will
    become a  wholly owned  subsidiary of  Silicon Graphics  and each  share  of
    common  stock of Cray, par value $1.00 per share ("Cray Common Stock"), will
    be converted at a one  to one ratio into  common stock of Silicon  Graphics,
    par  value  $0.001  per  share ("Silicon  Graphics  Common  Stock").  At the
    effective time of  the Merger  (the "Effective  Time"), each  share of  Cray
    Common  Stock issued and outstanding immediately prior to the Effective Time
    (other than shares  of Cray Common  Stock held  in the treasury  of Cray  or
    owned  by Merger Sub, Silicon Graphics  or any directly or indirectly wholly
    owned subsidiary  of Silicon  Graphics or  of Cray)  will be  cancelled  and
    converted  automatically  into  the  right to  receive  one  fully  paid and
    non-assessable share of Silicon Graphics Common Stock. A copy of the  Merger
    Agreement   is  attached  as  Annex  A  to  the  Proxy  Statement/Prospectus
    accompanying this Notice.
 
        2.  To approve and ratify amendments to and a restatement of Cray's 1989
    Employee Benefit Stock Plan (the "Plan Amendment").
 
        3.  To  transact such  other business as  may properly  come before  the
    Special Meeting or any postponements or adjournments thereof.
 
    The Board of Directors has fixed the close of business on May 8, 1996 as the
record  date for the determination of the  holders of Cray Common Stock entitled
to  notice  of,  and  to  vote  at,  the  Special  Meeting.  Accordingly,   only
stockholders  of record at  the close of  business on such  date are entitled to
notice of and to vote at the Special Meeting and any adjournment or postponement
thereof. The affirmative vote  of a majority of  the outstanding shares of  Cray
common  stock entitled to vote thereon is necessary for approval and adoption of
the Merger  Agreement and  approval of  the Merger.  The affirmative  vote of  a
majority of the votes cast thereon is necessary for approval and ratification of
the Plan Amendment.
 
    BECAUSE  MERGER SUB  HAS ACQUIRED  MORE THAN  A MAJORITY  OF THE OUTSTANDING
SHARES OF CRAY COMMON STOCK, MERGER  SUB HAS SUFFICIENT VOTING POWER TO  APPROVE
THE MERGER AND THE PLAN AMENDMENT, EVEN IF NO OTHER STOCKHOLDER OF CRAY VOTES IN
FAVOR OF THE MERGER. ACCORDINGLY, APPROVAL AND ADOPTION OF THE MERGER AGREEMENT,
APPROVAL  OF THE MERGER AND  APPROVAL AND RATIFICATION OF  THE PLAN AMENDMENT AT
THE SPECIAL MEETING IS ASSURED.
 
    Details of  the proposed  Merger,  the Plan  Amendment and  other  important
information concerning Silicon Graphics and Cray are more fully described in the
accompanying Proxy Statement/ Prospectus. Please give this material your careful
attention.
 
    All  stockholders are  cordially invited  to attend  the Special  Meeting in
person; however, to ensure your representation  at the Special Meeting, you  are
urged  to mark,  sign, date and  return the  enclosed proxy card  as promptly as
possible in the postage prepaid envelope enclosed for that purpose.
<PAGE>
    YOU MAY REVOKE YOUR PROXY IN THE MANNER DESCRIBED IN THE ACCOMPANYING  PROXY
STATEMENT/PROSPECTUS  AT  ANY  TIME BEFORE  IT  HAS  BEEN VOTED  AT  THE SPECIAL
MEETING. ANY STOCKHOLDER ATTENDING THE SPECIAL  MEETING MAY VOTE IN PERSON  EVEN
IF HE OR SHE HAS RETURNED A PROXY.
 
                                          Sincerely,
 
                                          Robert H. Ewald
                                          PRESIDENT AND
                                          CHIEF OPERATING OFFICER
 
Eagan, Minnesota
May 14, 1996
 
                                       2
<PAGE>
[Silicon Graphics Logo]
 
                                                                  [LOGO]
 
                              CRAY RESEARCH, INC.
                                PROXY STATEMENT
                               ------------------
 
                             SILICON GRAPHICS, INC.
                                   PROSPECTUS
                               ------------------
 
    This  Proxy  Statement/Prospectus is  being furnished  to holders  of common
stock, par value $1.00 per share ("Cray Common Stock"), of Cray Research,  Inc.,
a  Delaware corporation ("Cray"), in connection with the solicitation of proxies
by the  board  of directors  of  Cray  for use  at  a special  meeting  of  Cray
stockholders  (the "Special Meeting")  to be held  at 10:00 a.m.  local time, on
Wednesday, June 26,  1996, at Cray's  headquarters, 655 Lone  Oak Drive,  Eagan,
Minnesota 55121, and at any adjournment or postponement thereof for the purposes
set  forth herein  and in  the accompanying  Notice of  Special Meeting  of Cray
Stockholders.
 
    This  Proxy  Statement/Prospectus  constitutes   a  prospectus  of   Silicon
Graphics, Inc., a Delaware corporation ("Silicon Graphics"), with respect to the
issuance  and delivery of shares of common  stock, par value $.001 per share, of
Silicon Graphics ("Silicon Graphics Common Stock") in connection with the merger
of C Acquisition Corporation, a Delaware corporation and wholly owned subsidiary
of Silicon Graphics ("Merger Sub"), with and into Cray (the "Merger"),  pursuant
to the Agreement and Plan of Merger, dated as of February 25, 1996, by and among
Silicon  Graphics, Cray and Merger Sub (the "Merger Agreement"), a copy of which
is attached hereto as  Annex A. As a  result of the Merger,  Cray will become  a
wholly owned subsidiary of Silicon Graphics.
 
    SEE  "RISK FACTORS" BEGINNING ON PAGE 12 FOR CERTAIN CONSIDERATIONS RELEVANT
TO AN INVESTMENT IN THE SECURITIES REFERRED TO HEREIN.
 
THE SECURITIES TO BE ISSUED PURSUANT TO THIS PROXY STATEMENT/PROSPECTUS  HAVE
   NOT  BEEN  APPROVED  OR  DISAPPROVED  BY  THE  SECURITIES  AND EXCHANGE
      COMMISSION OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
          SECURITIES   AND  EXCHANGE   COMMISSION  OR   ANY  STATE
              SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
                  ADEQUACY   OF   THIS   PROXY   STATEMENT/
                     PROSPECTUS. ANY REPRESENTATION TO THE
                          CONTRARY    IS   A   CRIMINAL
                                    OFFENSE.
 
                            ------------------------
 
    This Proxy Statement/Prospectus and the accompanying form of proxy are first
being mailed to stockholders of Cray on or about May 14, 1996.
 
    The date of this Proxy Statement/Prospectus is May 14, 1996.
<PAGE>
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
AVAILABLE INFORMATION..........................           2
INCORPORATION OF CERTAIN DOCUMENTS BY
 REFERENCE.....................................           2
TRADEMARKS.....................................           3
SUMMARY........................................           4
  Business of Silicon Graphics.................           4
  Business of Cray.............................           4
  Date and Place of the Cray Special Meeting...           5
  The Merger; The Plan Amendment; Purpose of
   the Special Meeting.........................           5
  Stockholders Entitled to Vote................           6
  Vote Required................................           6
  Absence of Appraisal Rights..................           6
  Recommendation; Fairness Opinion.............           6
  Effective Time of the Merger.................           6
  Conditions to the Merger.....................           6
  Termination..................................           7
  Surrender of Certificates....................           7
  Accounting Treatment.........................           7
  Certain Federal Income Tax Consequences......           7
  Regulatory Matters...........................           7
  Interests of Certain Persons in the Merger...           7
  Operations Following the Merger..............           7
MARKET PRICE AND DIVIDEND INFORMATION..........           8
SELECTED HISTORICAL AND PRO FORMA FINANCIAL
 DATA..........................................           9
COMPARATIVE PER SHARE DATA.....................          11
RISK FACTORS...................................          12
  Risks Relating to the Merger.................          12
  Risks Relating to Silicon Graphics...........          12
THE SPECIAL MEETING............................          16
  General......................................          16
  Matters to Be Considered at the Special
   Meeting.....................................          16
  Record Date; Voting at the Special Meeting;
   Vote Required...............................          16
  Proxies......................................          16
THE MERGER.....................................          17
  General......................................          17
  Background of the Merger.....................          18
  Cray's Reasons for the Merger; Recommendation
   of the Cray Board...........................          20
  Silicon Graphics' Reasons for the Merger.....          21
  Operations Following the Merger..............          21
  Opinion of Cray's Financial Advisor..........          21
  Certain Federal Income Tax Consequences......          27
  Accounting Treatment.........................          28
  Interests of Certain Persons in the Merger...          28
 
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
  Regulatory Matters...........................          29
  Litigation...................................          30
  Absence of Appraisal Rights..................          30
THE MERGER AGREEMENT AND RELATED AGREEMENTS....          30
  The Merger...................................          30
  Conversion of Shares.........................          30
  Treatment of Cray Common Stock Options, Stock
   Purchase Plan, and Convertible Debentures...          31
  Business of Cray Pending the Merger..........          32
  Solicitation of Alternative Transactions.....          33
  Business of Silicon Graphics Pending the
   Merger......................................          34
  Corporate Structure and Related Matters After
   the Merger..................................          35
  Certain Covenants............................          35
  Representations and Warranties...............          36
  Conditions to the Merger.....................          36
  Termination; Amendment.......................          38
  Fees and Expenses............................          38
  Confidentiality Agreement....................          39
  Agreements of Cray Affiliates................          39
SILICON GRAPHICS AND CRAY PRO FORMA COMBINED
 CONDENSED FINANCIAL INFORMATION (Unaudited)...          40
COMPARISON OF STOCKHOLDERS' RIGHTS.............          45
  Cumulative Voting............................          45
  Classification of Board of Directors.........          45
  Amendment to Governing Documents.............          45
  Rights Plan..................................          45
COMPENSATION OF CRAY EXECUTIVES................          46
  Compensation of Non-employee Directors.......          46
  Executive Compensation.......................          47
PROPOSAL TO AMEND AND RESTATE THE CRAY
 RESEARCH, INC. 1989 EMPLOYEE BENEFIT STOCK
 PLAN..........................................          50
EXPERTS........................................          52
LEGAL MATTERS..................................          52
OTHER MATTERS..................................          52
STOCKHOLDER PROPOSALS..........................          52
ANNEX A  AGREEMENT AND PLAN OF MERGER
ANNEX B  OPINION OF SALOMON BROTHERS INC
ANNEX C  AMENDED AND RESTATED CRAY RESEARCH,
         INC. 1989 EMPLOYEE BENEFIT STOCK PLAN
</TABLE>
 
                                       i
<PAGE>
                             AVAILABLE INFORMATION
 
    Silicon Graphics and Cray are each subject to the informational requirements
of  the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith file reports, proxy statements, and other information  with
the  Securities and Exchange Commission  (the "Commission"). Such reports, proxy
statements and other information filed with the Commission can be inspected  and
copied  at the public reference facilities  maintained by the Commission at Room
1024, 450 Fifth Street,  N.W., Washington, D.C. 20549,  and at the  Commission's
Regional  Offices at Seven  World Trade Center,  13th Floor, New  York, New York
10048 and  Citicorp  Center,  500  West Madison  Street,  Suite  1400,  Chicago,
Illinois  60661. Copies of  such material also  can be obtained  from the Public
Reference Section of the Commission, Washington, D.C. 20549 at prescribed rates.
Such reports, proxy statements and  other information filed by Silicon  Graphics
and  Cray can also be  inspected at the offices of  the New York Stock Exchange,
Inc., 20 Broad Street, New York, New York 10005.
 
    Silicon Graphics has filed with  the Commission a Registration Statement  on
Form S-4 (together with any amendments or supplements thereto, the "Registration
Statement") under the Securities Act of 1933, as amended (the "Securities Act"),
with  respect to the securities  to be issued by  Silicon Graphics to holders of
Cray Common  Stock. This  Proxy Statement/Prospectus  does not  contain all  the
information  set forth in  the Registration Statement  and the exhibits thereto.
Such additional  information may  be obtained  from the  Commission's  principal
office    in   Washington,    D.C.   Statements   contained    in   this   Proxy
Statement/Prospectus as  to  the contents  of  any contract  or  other  document
referred  to herein 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, each such statement being qualified in all respects
by such reference.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents filed  by Silicon Graphics  with the Commission  are
incorporated by reference in this Proxy Statement/Prospectus:
 
        1.   Silicon Graphics'  Annual Report on  Form 10-K for  the fiscal year
    ended June 30, 1995.
 
        2.   Silicon Graphics'  Quarterly Report  on Form  10-Q for  the  fiscal
    quarter ended September 30, 1995.
 
        3.    Silicon Graphics'  Quarterly Report  on Form  10-Q for  the fiscal
    quarter ended December 31, 1995.
 
        4.  Silicon Graphics' Current Report on Form 8-K, dated April 2, 1996.
 
        5.   The description  of Silicon  Graphics' capital  stock contained  in
    Silicon  Graphics' Registration  Statement on  Form 8-B  filed on  March 16,
    1990.
 
        6.  The description of Silicon Graphics' Preferred Share Purchase Rights
    contained in  Silicon  Graphics'  Registration Statement  on  Form  8-A,  as
    amended by Silicon Graphics' Form 8-A/A, filed November 1, 1995.
 
    The  following documents filed by Cray  with the Commission are incorporated
by reference in this Proxy Statement/Prospectus:
 
        1.  Cray's Annual Report on Form 10-K for the fiscal year ended December
    31, 1995.
 
        2.  Cray's Current Report on Form 8-K, dated February 29, 1996.
 
        3.  Cray's Current Report on Form 8-K, dated April 2, 1996.
 
        4.   The  description  of  Cray's  capital  stock  contained  in  Cray's
    Registration Statement on Form 8-A, filed on October 7, 1980.
 
                                       2
<PAGE>
        5.   The description of Cray's Common Share Purchase Rights contained in
    Cray's Form 8-A, filed May 26, 1989.
 
    All documents filed by Silicon Graphics and Cray pursuant to Section  13(a),
13(c),  14  or  15(d)  of  the  Exchange  Act  after  the  date  of  this  Proxy
Statement/Prospectus and  prior to  the date  of the  Special Meeting  shall  be
deemed to be incorporated by reference in this Proxy Statement/Prospectus and to
be  a part  hereof from  the dates  of filing  of such  documents. Any statement
contained in a document incorporated or  deemed to be incorporated by  reference
herein  shall be deemed to be modified  or superseded for purposes of this Proxy
Statement/Prospectus to the extent that a  statement contained herein or in  any
other  subsequently filed document that also is  or is deemed to be incorporated
by reference herein modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Proxy Statement/Prospectus.
 
    THIS PROXY STATEMENT/PROSPECTUS  INCORPORATES BY  REFERENCE DOCUMENTS  WHICH
ARE  NOT  PRESENTED  HEREIN  OR  DELIVERED  HEREWITH.  THESE  DOCUMENTS (WITHOUT
EXHIBITS, UNLESS SUCH EXHIBITS ARE  SPECIFICALLY INCORPORATED BY REFERENCE)  ARE
AVAILABLE WITHOUT CHARGE UPON REQUEST. REQUESTS FOR DOCUMENTS SHOULD BE DIRECTED
TO  SILICON  GRAPHICS,  INC.,  2011 NORTH  SHORELINE  BOULEVARD,  MOUNTAIN VIEW,
CALIFORNIA 94043-1389, ATTENTION: INVESTOR RELATIONS, MAIL STOP 645  (TELEPHONE:
(415)  933-2607).  REQUESTS  FOR  CRAY  DOCUMENTS  SHOULD  BE  DIRECTED  TO CRAY
RESEARCH, INC., 655A LONE OAK  DRIVE, EAGAN, MINNESOTA 55121; (TELEPHONE:  (612)
683-5681), ATTENTION: CORPORATE SECRETARY. IN ORDER TO ENSURE TIMELY DELIVERY OF
THE  DOCUMENTS PRIOR TO THE SPECIAL MEETING, ANY REQUEST SHOULD BE MADE PRIOR TO
JUNE 21, 1996.
                            ------------------------
 
    NO PERSON  HAS  BEEN AUTHORIZED  TO  GIVE ANY  INFORMATION  OR TO  MAKE  ANY
REPRESENTATIONS NOT CONTAINED OR INCORPORATED IN THIS PROXY STATEMENT/PROSPECTUS
IN  CONNECTION WITH THE MATTERS  REFERRED TO HEREIN AND,  IF GIVEN OR MADE, SUCH
INFORMATION OR  REPRESENTATIONS  MUST NOT  BE  RELIED  UPON AS  HAVING  BEEN  SO
AUTHORIZED  BY SILICON GRAPHICS OR BY CRAY. THIS PROXY STATEMENT/PROSPECTUS DOES
NOT CONSTITUTE AN OFFER OF ANY  SECURITIES OTHER THAN THE REGISTERED  SECURITIES
TO  WHICH IT RELATES, OR  AN OFFER TO ANY PERSON  IN ANY JURISDICTION WHERE SUCH
OFFER WOULD BE UNLAWFUL. THE  DELIVERY OF THIS PROXY STATEMENT/PROSPECTUS  SHALL
NOT, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION HEREIN
IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
                            ------------------------
 
                                   TRADEMARKS
 
    Silicon  Graphics and the Silicon Graphics logo are registered trademarks of
Silicon Graphics, Inc.,  and Alias/Wavefront,  Silicon Studio  and WebFORCE  are
trademarks  of Silicon  Graphics, Inc.  MIPS is  a registered  trademark of MIPS
Technologies, Inc. CRAY is  a registered trademark of  Cray Research, Inc.,  and
CRAY  T90,  CRAY  J90,  CRAY  T3D,  CRAY  T3E  and  CRAY  Superserver  6400  are
unregistered trademarks of Cray  Research, Inc. This Proxy  Statement/Prospectus
also  contains  trademarks  of  companies  other  than  Silicon  Graphics,  MIPS
Technologies, Inc. and Cray.
 
                                       3
<PAGE>
                                    SUMMARY
 
    THE  FOLLOWING IS A  SUMMARY OF CERTAIN  INFORMATION ABOUT SILICON GRAPHICS,
CRAY, THE MERGER AGREEMENT AND  THE MERGER AND IS  QUALIFIED IN ITS ENTIRETY  BY
REFERENCE  TO THE  FULL TEXT  OF THIS  PROXY STATEMENT/PROSPECTUS,  THE EXHIBITS
HERETO AND  THE DOCUMENTS  INCORPORATED BY  REFERENCE HEREIN.  STOCKHOLDERS  ARE
URGED  TO READ THIS PROXY STATEMENT/PROSPECTUS  AND THE ACCOMPANYING EXHIBITS IN
THEIR ENTIRETY.  SEE  "RISK FACTORS"  FOR  CERTAIN INFORMATION  THAT  SHOULD  BE
CONSIDERED BY THE STOCKHOLDERS OF CRAY.
 
    THIS  PROXY  STATEMENT/PROSPECTUS, AND  DOCUMENTS INCORPORATED  BY REFERENCE
HEREIN, CONTAIN CERTAIN FORWARD-LOOKING  STATEMENTS, INCLUDING, BUT NOT  LIMITED
TO  STATEMENTS REGARDING  EXPECTED BENEFITS OF  THE MERGER AND  THE BUSINESS AND
OPERATIONS OF CRAY FOLLOWING THE MERGER. ACTUAL RESULTS COULD DIFFER  MATERIALLY
FROM THE RESULTS DISCUSSED IN THE FORWARD-LOOKING STATEMENTS. FACTORS THAT COULD
CAUSE  OR  CONTRIBUTE  TO SUCH  DIFFERENCES  INCLUDE THOSE  DISCUSSED  UNDER THE
CAPTION "RISK FACTORS" AND OTHER  FACTORS INCLUDED OR INCORPORATED BY  REFERENCE
ELSEWHERE IN THIS PROXY STATEMENT/PROSPECTUS.
 
BUSINESS OF SILICON GRAPHICS
 
    Silicon  Graphics is a  leading supplier of  visual computing systems, which
provide users with the ability to interact with their work in real-time,  color,
three-dimensions  ("3D"),  motion,  sound  and  video.  Through  its  family  of
workstations, servers and supercomputers, Silicon Graphics delivers  interactive
3D  graphics, digital  media and multiprocessing  supercomputing technologies to
technical, scientific, corporate and creative professionals. Since its  founding
in  1982, Silicon Graphics has been committed  to defining new classes of visual
computing  and  transforming  these  computing  processes  into   cost-effective
solutions for a variety of industries.
 
    Silicon  Graphics' subsidiary, MIPS Technologies,  Inc. designs and licenses
for MIPS-Registered  Trademark-  RISC  microprocessor family,  used  in  Silicon
Graphics-Registered  Trademark-  products  and  those  of  other  companies  for
computer, consumer and embedded control  applications. Silicon Graphics is  also
actively  engaged  in the  development of  advanced  tools and  applications for
digital content creation  and distribution,  including its  Alias/Wavefront-TM-,
Silicon Studio-TM- and WebFORCE-TM- products lines.
 
    Silicon  Graphics is a Delaware corporation. Its principal executive offices
are located  at  2011  North  Shoreline  Boulevard,  Mountain  View,  California
94043-1389, and its telephone number is (415) 960-1980.
 
BUSINESS OF CRAY
 
    Cray  is  a  leading  supplier of  supercomputing  tools  and  services. The
computational tools  created  by  Cray  consist  of  high-performance  computing
systems  and related software and are used primarily by scientists and engineers
to perform  computational  research. Computational  research,  the  mathematical
modeling  and simulation  of physical  and other  quantifiable phenomena, allows
researchers  to  investigate  areas  that  are  physically  impossible  or   too
time-consuming,  dangerous,  or  expensive to  study  in any  other  way. Cray's
computational tools  are used  by scientists  and engineers  in many  commercial
industries   including   aerospace,   automotive,   chemical/pharmaceutical  and
petroleum, as  well as  in many  public and  private research  centers, such  as
government and environmental science organizations and universities.
 
    Cray's  products consist primarily of the following: (i) the CRAY T90 series
of high-end parallel vector processor ("PVP") supercomputer systems, offered  in
configurations  ranging from one to thirty-two central processing units ("CPUs")
ranging in price from $2.5 million up  to $35 million per system; (ii) the  CRAY
J90  series of lower-priced PVP supercomputer systems, offered in configurations
of four to thirty-two CPUs ranging in price from $415,000 to $2.7 million; (iii)
the CRAY T3D series of  massively parallel processor supercomputer systems,  and
the  follow-on  CRAY  T3E  series  which  is  a  stand-alone  system  offered in
configurations ranging from 16 to 2,048 processors at prices ranging from  under
$1  million to more than $100 million;  (iv) the CRAY Superserver 6400 series of
 
                                       4
<PAGE>
symmetric multiprocessor systems, which provides  the basis for Cray's focus  on
the  high-performance commercial  computing market  and (v)  associated software
(including operating systems, compilers  and application software),  peripherals
and support.
 
    Cray  Research, Inc. was incorporated in 1972 as a Delaware corporation. Its
principal corporate  and administrative  offices are  located at  655A Lone  Oak
Drive, Eagan, Minnesota 55121, and its telephone number is (612) 452-6650.
 
DATE AND PLACE OF THE CRAY SPECIAL MEETING
 
    The  Special Meeting will be held on  Wednesday, June 26, 1996 at 10:00 a.m.
local time, at Cray's headquarters, 655 Lone Oak Drive, Eagan, Minnesota 55121.
 
THE MERGER; THE PLAN AMENDMENT; PURPOSE OF THE SPECIAL MEETING
 
    GENERAL.  Silicon Graphics, Merger Sub and Cray have entered into the Merger
Agreement, providing for, among other things, a tender offer by Merger Sub  (the
"Offer") and the Merger (together, the "Transaction"). Pursuant to the Offer, on
April  2, 1996, Merger Sub purchased 19,218,735 shares of Cray Common Stock at a
price of $30.00  per share in  cash. Accordingly, approval  and adoption of  the
Merger  Agreement and approval of the Merger  is assured. Pursuant to the Merger
Agreement, Merger  Sub and  Cray  will, as  soon  as practicable  following  the
consummation of the Offer, consummate the Merger.
 
    THE  MERGER.   As a result  of the Merger,  each share of  Cray Common Stock
issued and outstanding  immediately prior to  the effective time  of the  Merger
(the  "Effective Time")  (other than  shares of  Cray Common  Stock held  in the
treasury of Cray or  owned by Merger  Sub, Silicon Graphics  or any directly  or
indirectly  wholly owned subsidiary of Silicon Graphics or of Cray collectively,
"Ineligible Shares")  will be  cancelled and  converted automatically  into  the
right  to receive  one fully paid  and non-assessable share  of Silicon Graphics
Common Stock (the "Exchange Ratio").
 
    Upon consummation of  the Merger, each  then-outstanding option to  purchase
Cray  Common Stock (an  "Option") will be  assumed by Silicon  Graphics and will
automatically be converted into an option  to purchase that number of shares  of
Silicon Graphics Common Stock equal to the number of shares of Cray Common Stock
such  option was exercisable for at the time  of the Merger at an exercise price
equal to the per share exercise price of  the Option at the time of the  Merger.
Subject  to the consummation of the Merger on  the last trading day prior to the
Effective Time  (the "Final  Purchase Date"),  Cray will  apply any  funds  then
credited to each Cray Qualified Stock Purchase Investment Plan ("Purchase Plan")
participant's  payroll withholding  account to the  purchase of  whole shares of
Cray Common Stock. Under the  Merger Agreement, the 6% Convertible  Subordinated
Debentures  due 2011 of  Cray (the "Convertible  Debentures") shall, pursuant to
the terms of  the Indenture,  dated as  of February  1, 1986,  between Cray  and
Manufacturers  Hanover  Trust  Company,  as  Trustee  (the  "Indenture"), become
thereafter convertible  only into  that  number of  shares of  Silicon  Graphics
Common  Stock  that the  holder of  any such  Convertible Debentures  would have
received if  such holder  had converted  such Convertible  Debentures into  Cray
Common  Stock immediately prior to the Effective Time. See "The Merger Agreement
and Related Agreements -- Conversion of Shares" and "-- Treatment of Cray Common
Stock Options and Cray Stock Purchase Plan, and Convertible Debentures."
 
    THE PLAN AMENDMENT.  Effective May 3,  1996, the Board of Directors of  Cray
(the  "Cray Board") amended and restated Cray's 1989 Employee Benefit Stock Plan
(the "Employee Stock Option Plan"), subject to ratification of the  stockholders
of  Cray at the Special  Meeting, to conform certain  provisions of the Employee
Stock Option Plan to the analogous provisions of the Silicon Graphics'  employee
stock option plans.
 
    THE  SPECIAL MEETING.  At the Special Meeting, the stockholders of Cray will
consider and vote upon proposals (i)  to approve and adopt the Merger  Agreement
and  to  approve the  Merger, (ii)  to approve  and ratify  amendments to  and a
restatement of the Plan Amendment and  (iii) to transact such other business  as
may   properly  come  before  the  Special   Meeting  or  any  postponements  or
adjournments thereof. See "The  Special Meeting -- Matters  to Be Considered  at
the Special Meeting."
 
                                       5
<PAGE>
STOCKHOLDERS ENTITLED TO VOTE
 
    The close of business on May 8, 1996 is the record date for determination of
holders  of Cray Common Stock  entitled to vote at  the Special Meeting. At that
date,  26,152,736  shares  of  Cray  Common  Stock  were  outstanding,  held  by
approximately  4,317 holders of record. As of such date, directors and executive
officers of Cray and their affiliates (including Merger Sub) may be deemed to be
the beneficial owners of shares of Cray Common Stock representing  approximately
76%  of the outstanding voting power of Cray. See "The Special Meeting -- Record
Date; Voting at the Special Meeting; Vote Required."
 
    Merger Sub and the directors and  executive officers of Cray have  indicated
that  they intend  to vote  the shares  of Cray  Common Stock  held by  them for
approval and adoption of the Merger Agreement and approval of the Merger.
 
VOTE REQUIRED
 
    Approval and adoption  of the Merger  Agreement and approval  of the  Merger
will  require  the  affirmative  vote  of  the  holders  of  a  majority  of the
outstanding shares of Cray Common Stock entitled to vote thereon. Approval 1 and
ratification of  the Plan  Amendment  will require  the  affirmative vote  of  a
majority  of the votes cast  thereon. MERGER SUB HAS  SUFFICIENT VOTING POWER TO
CAUSE THE APPROVAL  AND ADOPTION OF  THE MERGER AGREEMENT,  THE APPROVAL OF  THE
MERGER  AND THE  APPROVAL AND  RATIFICATION OF  THE PLAN  AMENDMENT, WITHOUT THE
AFFIRMATIVE VOTE OF ANY OTHER STOCKHOLDER.
 
ABSENCE OF APPRAISAL RIGHTS
 
    Under the Delaware General Corporation  Law (the "DGCL"), Cray  stockholders
will not be entitled to appraisal rights as a result of the Merger.
 
RECOMMENDATION; FAIRNESS OPINION
 
    THE  CRAY BOARD APPROVED THE  OFFER, THE MERGER AND  THE MERGER AGREEMENT ON
FEBRUARY 25, 1996 AND RECOMMENDS THAT HOLDERS OF CRAY COMMON STOCK VOTE FOR  THE
APPROVAL  AND  ADOPTION OF  THE  MERGER AGREEMENT  AND  APPROVAL OF  THE MERGER.
SALOMON BROTHERS INC ("SALOMON  BROTHERS") HAS DELIVERED TO  THE CRAY BOARD  ITS
WRITTEN  OPINION DATED AS OF  FEBRUARY 25, 1996 THAT,  BASED UPON AND SUBJECT TO
THE VARIOUS CONSIDERATIONS SET  FORTH IN SUCH  OPINION, AS OF  THE DATE OF  SUCH
OPINION, THE CONSIDERATION TO BE RECEIVED BY HOLDERS OF CRAY COMMON STOCK IN THE
TRANSACTION IS FAIR, FROM A FINANCIAL POINT OF VIEW, TO SUCH HOLDERS.
 
    A  copy of the opinion of Salomon Brothers, which sets forth the assumptions
made, procedures followed, matters considered  and scope of review, is  attached
to  this Proxy Statement/Prospectus as  Annex B and should  be read carefully in
its entirety. See  "The Merger --  Opinion of Cray's  Financial Advisor,"  which
contains  a  discussion of  the  fees to  be paid  to  Salomon Brothers  and the
conditions under  which such  fees  are payable.  Salomon Brothers  assisted  in
negotiating  the consideration, but the consideration was established by Silicon
Graphics and Cray. Certain portions of the  fees to be paid to Salomon  Brothers
are  contingent upon consummation of  the Merger. See "The  Merger -- Opinion of
Cray's Financial Advisor."
 
EFFECTIVE TIME OF THE MERGER
 
    As  promptly  as  practicable  after  the  satisfaction  or  waiver  of  the
conditions  set forth in the  Merger Agreement, the parties  thereto will file a
certified agreement  of merger  with the  Secretary of  State of  Delaware.  The
Merger  will become  effective upon such  filing (the  "Effective Time"), which,
assuming all  conditions are  met, is  anticipated to  occur shortly  after  the
Special  Meeting. See "The Merger Agreement  and Related Agreements -- Effective
Time of the Merger."
 
CONDITIONS TO THE MERGER
 
    Consummation of the  Merger is subject  to the satisfaction  of a number  of
conditions,  including but not limited to, (i)  the approval and adoption of the
Merger Agreement by  the requisite vote  of the stockholders  of Cray; (ii)  the
absence  of  any  restrictive court  orders  or  any other  legal  restraints or
prohibitions, preventing or making illegal  the consummation of the Merger;  and
(iii)  the continuing accuracy  in all material  respects of the representations
and warranties made by each of Cray and Silicon Graphics in the Merger Agreement
on and  as  of  the  Effective  Time. See  "The  Merger  Agreement  and  Related
Agreements -- Conditions to the Merger."
 
                                       6
<PAGE>
TERMINATION
 
    The Merger Agreement may be terminated and the Merger may be abandoned prior
to the Effective Time notwithstanding approval by the stockholders of Cray under
the   circumstances  specified  in  the  Merger  Agreement,  including,  without
limitation, by mutual  written agreement  of Silicon  Graphics and  Cray and  by
either party if the Merger is not consummated by September 30, 1996.
 
    Under  certain circumstances Cray may be  required to pay Silicon Graphics a
termination fee if the Merger Agreement is terminated. See "The Merger Agreement
and Related Agreements -- Fees and Expenses."
 
SURRENDER OF CERTIFICATES
 
    If the Merger  becomes effective,  Silicon Graphics  will mail  a letter  of
transmittal  with instructions to all holders of  record of Cray Common Stock as
of the  Effective Time  for  use in  surrendering  their stock  certificates  in
exchange  for certificates representing Silicon Graphics Common Stock and a cash
payment in lieu  of fractional  shares. CERTIFICATES SHOULD  NOT BE  SURRENDERED
UNTIL THE LETTER OF TRANSMITTAL IS RECEIVED.
 
ACCOUNTING TREATMENT
 
    The Merger will be accounted for under the purchase method.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    The  receipt of  Silicon Graphics Common  Stock or a  combination of Silicon
Graphics Common  Stock  and  cash pursuant  to  the  Merger will  be  a  taxable
transaction  for federal  income tax purposes.  See "Certain  Federal Income Tax
Consequences."
 
REGULATORY MATTERS
 
    The waiting period applicable to the Merger under the Antitrust Improvements
Act of 1976,  as amended (the  "HSR Act"), expired  at 11:59 p.m.  on March  26,
1996. See "The Merger -- Regulatory Matters."
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
    In  considering the  recommendation of  the Cray  Board with  respect to the
Merger, stockholders should be aware that certain directors and officers of Cray
have interests  in the  Merger that  present them  with potential  conflicts  of
interest. See "The Merger -- Interests of Certain Persons in the Merger."
 
OPERATIONS FOLLOWING THE MERGER
 
    It  is  expected  that, initially  following  the Merger,  the  business and
operations of Cray will, except as set forth in this Proxy Statement/Prospectus,
be continued  by  Cray substantially  as  they are  currently  being  conducted.
Silicon  Graphics will continue to evaluate  the business and operations of Cray
after the consummation  of the Merger  and will  take such actions  as it  deems
appropriate under the circumstances then existing.
 
    Except  as  indicated  in  this Proxy  Statement/Prospectus  and  except for
changes normally associated with the conversion to the status of a  wholly-owned
subsidiary,  Silicon Graphics does not have any present plans or proposals which
relate to or would result in  an extraordinary corporate transaction, such as  a
merger,   reorganization  or   liquidation,  involving   Cray  or   any  of  its
subsidiaries, a sale or transfer of a  material amount of assets of Cray or  any
of  its subsidiaries or any material change in Cray's capitalization or dividend
policy or any other material changes in Cray's corporate structure or  business.
Silicon  Graphics  expects that  the Merger  will  change its  current financial
target model  in several  respects,  including a  decline  in gross  margin.  In
addition,  for the fourth quarter of fiscal 1996 and for fiscal 1997 as a whole,
Silicon Graphics'  results  will be  adversely  affected by  several  short-term
purchase accounting impacts and other Merger related expenses. These matters are
discussed  in detail in Silicon Graphics' Form  10-Q for the quarter ended March
31, 1996, which is incorporated by reference in this Proxy Statement/Prospectus.
 
                                       7
<PAGE>
                     MARKET PRICE AND DIVIDEND INFORMATION
 
    The following table sets forth, for the periods indicated, the range of high
and  low sale  prices for Silicon  Graphics Common  Stock in the  New York Stock
Exchange  Composite  Transactions  Tape  (as  reported  in  published  financial
sources).  The closing price for  Silicon Graphics Common Stock  on the New York
Stock Exchange (the  "NYSE") on  February 23, 1996,  the last  full trading  day
prior  to the public  announcement of the  Merger Agreement and  of Merger Sub's
intention to  commence the  Offer, was  $27.50 and  on May  9, 1996  the  latest
practicable  trading day before the printing of this Proxy Statement/Prospectus,
was $27.50.
 
<TABLE>
<CAPTION>
FISCAL YEARS ENDED JUNE 30                                                   HIGH        LOW
- -------------------------------------------------------------------------  ---------  ---------
<S>                                                                        <C>        <C>
1994
First Quarter............................................................  $   22.50  $   16.06
Second Quarter...........................................................      24.75      19.81
Third Quarter............................................................      26.88      21.50
Fourth Quarter...........................................................      25.88      18.75
1995
First Quarter............................................................  $   26.88  $   21.25
Second Quarter...........................................................      33.13      24.13
Third Quarter............................................................      38.00      29.13
Fourth Quarter...........................................................      42.00      33.75
1996
First Quarter............................................................  $   45.63  $   33.00
Second Quarter...........................................................      38.75      26.88
Third Quarter............................................................      30.38      21.13
Fourth Quarter (through May 9, 1996).....................................      30.13      24.50
</TABLE>
 
    Cray Common  Stock  is  listed  and principally  traded  on  the  NYSE.  The
following table sets forth the range of high and low sale prices reported on the
NYSE  as reported by  the Dow Jones News  Service for Cray  Common Stock for the
fiscal periods indicated. The closing price for Cray Common Stock on the NYSE on
February 23, 1996, the last trading day prior to the public announcement of  the
Merger Agreement and of Merger Sub's intention to commence the Offer, was $25.25
and  on May 9, 1996,  the latest practicable trading  day before the printing of
this Proxy Statement/Prospectus,  was $27.38.  The equivalent  market price  per
share  of Cray  Common Stock,  based upon  the Exchange  Ratio, would  have been
$27.50 and $27.50, respectively.
 
<TABLE>
<CAPTION>
FISCAL YEARS ENDED DECEMBER 31                                               HIGH        LOW
- -------------------------------------------------------------------------  ---------  ---------
<S>                                                                        <C>        <C>
1994
First Quarter............................................................  $   33.75  $   25.38
Second Quarter...........................................................      29.75      19.13
Third Quarter............................................................      24.00      20.25
Fourth Quarter...........................................................      21.50      14.63
1995
First Quarter............................................................  $   18.63  $   14.63
Second Quarter...........................................................      26.00      18.13
Third Quarter............................................................      29.25      21.75
Fourth Quarter...........................................................      24.88      20.25
1996
First Quarter............................................................  $   29.13  $   24.00
Second Quarter (through May 9, 1996).....................................      29.75      24.25
</TABLE>
 
    As of May  8, 1996, Silicon  Graphics and Cray  had approximately 6,469  and
4,317  holders of  record, respectively. Neither  Silicon Graphics  nor Cray has
paid any dividends  on their common  stock during the  periods set forth  above.
Each  of Silicon Graphics and Cray currently  intends to retain earnings for use
in their respective businesses and does not anticipate paying cash dividends  on
their  common stock in the foreseeable future. In addition, the Merger Agreement
prohibits the payment of any dividends by Cray prior to the Effective Time.
 
                                       8
<PAGE>
                SELECTED HISTORICAL AND PRO FORMA FINANCIAL DATA
 
    The following selected historical financial information of Silicon  Graphics
and  Cray  has  been  derived  from  their  respective  historical  consolidated
financial statements, and should be  read in conjunction with such  consolidated
financial  statements and the notes thereto, which are incorporated by reference
in this Proxy  Statement/Prospectus. The Silicon  Graphics historical  financial
statement  information as of and for the  six months ended December 31, 1995 and
1994 has been prepared on the  same basis as the historical information  derived
from  the  audited  financial  statements and,  in  the  opinion  of management,
contains  all  adjustments,  consisting  only  of  normal  recurring   accruals,
necessary  for  the fair  presentation  of the  results  of operations  for such
periods.
 
    The unaudited selected pro forma  financial information of Silicon  Graphics
and  Cray is derived  from the unaudited pro  forma combined condensed financial
statements of Silicon Graphics and Cray  and should be read in conjunction  with
such  pro forma statements  and notes thereto  which are included  in this Proxy
Statement/Prospectus. For Silicon Graphics and Cray pro forma purposes,  Silicon
Graphics' historical condensed consolidated statement of operations for the year
ended  June  30, 1995  and  Silicon Graphics'  unaudited  condensed consolidated
statement of operations  for the six  months ended December  31, 1995 have  been
combined  with the unaudited  condensed consolidated statement  of operations of
Cray for the twelve-month period ended June 30, 1995 and the unaudited condensed
consolidated statement of operations of Cray  for the six months ended  December
31, 1995, respectively.
 
    The pro forma information is presented for illustrative purposes only and is
not  necessarily indicative of the operating  results or financial position that
would have  occurred  if  the Merger  had  been  in effect  during  the  periods
presented,  nor  is it  necessarily indicative  of  future operating  results or
financial position. In particular,  the actual adjustments  to the valuation  of
Cray  assets  and  liabilities  in  connection  with  the  acquisition  may vary
significantly  from  the  preliminary  estimates  reflected  in  the  pro  forma
financial information.
 
                       SELECTED HISTORICAL FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                                                                             SIX MONTHS
                                               YEAR ENDED JUNE 30,                       ENDED DECEMBER 31,
                             --------------------------------------------------------  ----------------------
                                1995        1994        1993       1992       1991        1995        1994
                             ----------  ----------  ----------  ---------  ---------  ----------  ----------
                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                          <C>         <C>         <C>         <C>        <C>        <C>         <C>
SILICON GRAPHICS
Statement of Operations
 Data:
  Net revenue..............  $2,228,268  $1,537,766  $1,132,869  $ 906,713  $ 735,954  $1,267,012  $  998,074
  Income (loss) from
   continuing operations...     224,856     141,414      82,803   (101,318)    39,810     110,710     109,139
  Net income (loss)........     224,856     141,814      73,540   (101,183)    39,810     110,710     104,139
  Income (loss) from
   continuing operations
   per share...............       $1.28       $0.86       $0.53     $(0.89)     $0.32       $0.62       $0.60
  Net income (loss) per
   share...................       $1.28       $0.86       $0.47     $(0.89)     $0.32       $0.62       $0.60
  Shares used to compute
   per share data..........     175,435     165,149     154,887    119,233    124,260     178,268     173,155
Balance Sheet Data:
  Cash, cash equivalents
   and marketable
   investments.............  $  780,012  $  604,444  $  208,538  $ 195,088  $ 311,061  $  694,573  $  765,640
  Total assets.............   2,206,619   1,567,052   1,048,294    892,673    887,212   2,265,487   1,905,523
  Long-term obligations....     287,267     252,645      56,832     71,900     52,049     277,575     280,623
  Stockholders' equity.....   1,346,170     937,169     696,649    562,230    676,690   1,443,284   1,130,228
</TABLE>
 
                                       9
<PAGE>
 
<TABLE>
<CAPTION>
                                                                      YEAR ENDED DECEMBER 31,
                                                     ---------------------------------------------------------
                                                       1995        1994        1993        1992        1991
                                                     ---------  ----------  ----------  ----------  ----------
                                                               (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                  <C>        <C>         <C>         <C>         <C>
CRAY
Statement of Operations Data:
  Net revenue......................................  $ 676,244  $  921,609  $  894,857  $  797,578  $  862,457
  Net income (loss)................................   (226,364)     55,696      60,855     (14,875)    113,047
  Net income (loss) per share......................  $   (8.95) $     2.16  $     2.33  $    (0.56) $     4.15
  Shares used to compute per share data............     25,282      25,845      26,118      26,493      28,160
Balance Sheet Data:
  Cash, cash equivalents and marketable
   investments.....................................  $ 254,425  $  255,543  $  228,373  $  154,953  $  106,963
  Total assets.....................................    978,054   1,181,879   1,169,768   1,021,264   1,079,046
  Long-term obligations............................    103,454     115,030     118,464     113,891     113,494
  Stockholders' equity.............................    602,428     828,910     779,341     723,061     758,672
</TABLE>
 
                       SELECTED PRO FORMA FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
<TABLE>
<CAPTION>
                                                                             YEAR ENDED JUNE 30, 1995
                                                                  ----------------------------------------------
                                                                                          PRO FORMA   PRO FORMA
                                                                     SGI        CRAY     ADJUSTMENT    COMBINED
                                                                  ----------  ---------  -----------  ----------
<S>                                                               <C>         <C>        <C>          <C>
SILICON GRAPHICS AND CRAY
Statement of Operations Data:
  Net revenue...................................................  $2,228,268  $ 727,723   $  --       $2,955,991
  Net income (loss).............................................     224,856   (161,659)  $ (65,100)      (1,903)
  Net income (loss) per share...................................  $     1.28  $   (6.33)              $    (0.01)
  Shares used to compute per share data.........................     175,435     25,539                  162,800
 
<CAPTION>
 
                                                                        SIX MONTHS ENDED DECEMBER 31, 1995
                                                                  ----------------------------------------------
                                                                                          PRO FORMA   PRO FORMA
                                                                     SGI        CRAY     ADJUSTMENT    COMBINED
                                                                  ----------  ---------  -----------  ----------
<S>                                                               <C>         <C>        <C>          <C>
SILICON GRAPHICS AND CRAY
Statement of Operations Data:
  Net revenue...................................................  $1,267,012  $ 405,447   $  --       $1,672,459
  Net income (loss).............................................     110,710    (39,165)  $ (34,720)      36,825
  Net income (loss) per share...................................  $     0.62  $   (1.55)              $     0.20
  Shares used to compute per share data.........................     178,268     25,281                  184,700
<CAPTION>
 
                                                                             AS OF DECEMBER 31, 1995
                                                                  ----------------------------------------------
                                                                                          PRO FORMA   PRO FORMA
                                                                     SGI        CRAY     ADJUSTMENT    COMBINED
                                                                  ----------  ---------  -----------  ----------
<S>                                                               <C>         <C>        <C>          <C>
SILICON GRAPHICS AND CRAY
Balance Sheet Data:
  Cash, cash equivalents and marketable investments.............  $  694,573  $ 254,425   $(348,000)  $  600,998
  Total assets..................................................   2,265,487    978,054    (205,000)   3,038,541
  Long-term obligations.........................................     277,575    103,454     (18,000)     363,029
  Stockholders' equity..........................................   1,443,284    602,428    (511,000)   1,534,712
</TABLE>
 
                                       10
<PAGE>
                           COMPARATIVE PER SHARE DATA
 
    The  following table sets forth certain historical per share data of Silicon
Graphics and Cray and combined  per share data on  an unaudited pro forma  basis
after  giving effect to the Merger. This data should be read in conjunction with
the  selected  financial  data,  the  pro  forma  combined  condensed  financial
statements  and the separate historical financial statements of Silicon Graphics
and Cray and  the notes thereto,  included or incorporated  by reference in  the
Proxy  Statement/Prospectus. The unaudited pro forma combined financial data are
not necessarily  indicative  of  the  operating results  that  would  have  been
achieved  had  the Merger  been in  effect as  of the  beginning of  the periods
presented and should not be construed as representative of future operations  or
book  values. In  particular, the  actual adjustments  to the  valuation of Cray
assets and liabilities in connection with the acquisition may vary significantly
from the estimates reflected in the pro forma financial information.
 
<TABLE>
<CAPTION>
                                                                                   YEAR ENDED     SIX MONTHS ENDED
                                                                                  JUNE 30, 1995   DECEMBER 31, 1995
                                                                                  -------------  -------------------
<S>                                                                               <C>            <C>
HISTORICAL -- SILICON GRAPHICS
Net income......................................................................    $    1.28         $    0.62
Book value......................................................................    $    8.28         $    8.78
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                    YEAR ENDED
                                                                                                 DECEMBER 31, 1995
                                                                                                 -----------------
<S>                                                                                              <C>
HISTORICAL -- CRAY
Net loss.......................................................................................      $   (8.95)
Book value.....................................................................................      $   23.60
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                   YEAR ENDED     SIX MONTHS ENDED
                                                                                  JUNE 30, 1995   DECEMBER 31, 1995
                                                                                  -------------  -------------------
<S>                                                                               <C>            <C>
SILICON GRAPHICS AND CRAY
Pro Forma Combined -- Per Silicon Graphics Share:
  Net income (loss).............................................................    $   (0.01)        $    0.20
  Book value....................................................................       --             $    9.09
Equivalent Pro Forma Combined -- Per Cray Share:
  Net income (loss).............................................................    $   (0.01)        $    0.20
  Book value....................................................................       --             $    9.09
</TABLE>
 
                                       11
<PAGE>
                                  RISK FACTORS
 
    THE FOLLOWING RISK FACTORS  SHOULD BE CONSIDERED BY  HOLDERS OF CRAY  COMMON
STOCK  IN CONNECTION WITH  THE RECEIPT OF  SILICON GRAPHICS COMMON  STOCK IN THE
MERGER. CERTAIN  OF  THESE  FACTORS  RELATE  DIRECTLY  TO  THE  MERGER  AND  THE
OPERATIONS  OF  THE COMBINED  BUSINESS FOLLOWING  THE  MERGER, WHILE  OTHERS ARE
PRESENT IN SILICON  GRAPHICS' GENERAL  BUSINESS ENVIRONMENT  INDEPENDENT OF  THE
MERGER.  THESE  FACTORS  SHOULD  BE CONSIDERED  IN  CONJUNCTION  WITH  THE OTHER
INFORMATION   INCLUDED   AND   INCORPORATED   BY   REFERENCE   IN   THIS   PROXY
STATEMENT/PROSPECTUS.
 
    THIS  PROXY  STATEMENT/PROSPECTUS, AND  DOCUMENTS INCORPORATED  BY REFERENCE
HEREIN, CONTAIN CERTAIN FORWARD-LOOKING  STATEMENTS, INCLUDING, BUT NOT  LIMITED
TO  STATEMENTS REGARDING  EXPECTED BENEFITS OF  THE MERGER AND  THE BUSINESS AND
OPERATIONS OF CRAY FOLLOWING THE MERGER. ACTUAL RESULTS COULD DIFFER  MATERIALLY
FROM THE RESULTS DISCUSSED IN THE FORWARD-LOOKING STATEMENTS. FACTORS THAT COULD
CAUSE OR CONTRIBUTE TO SUCH DIFFERENCES INCLUDE THE RISK FACTORS DISCUSSED BELOW
AND  OTHER FACTORS INCLUDED OR INCORPORATED BY REFERENCE ELSEWHERE IN THIS PROXY
STATEMENT/PROSPECTUS.
 
RISKS RELATING TO THE MERGER
 
    INTEGRATION OF OPERATIONS.   The  combination of Cray  and Silicon  Graphics
will  require,  among other  things,  integration of  the  companies' respective
product offerings and coordination of  their respective sales and marketing  and
research  and  development efforts.  The  challenges posed  by  this combination
include the  management of  a  business with  a  different approach  to  product
design,  manufacturing and sales and service,  the development of a consolidated
product road map from a number of incompatible products and the integration of a
number of geographically separated research and development centers. The success
of this process will be significantly influenced by the ability of the  combined
business to retain key management, sales and research and development personnel.
There  is no  assurance that this  integration will be  accomplished smoothly or
successfully. The integration  of operations following  the Merger will  require
the dedication of management resources, which may temporarily distract attention
from  the  day-to-day  business  of  the  combined  business.  The  inability of
management to successfully integrate the operations of Cray and Silicon Graphics
could have an adverse effect  on the business and  results of operations of  the
combined business.
 
    CUSTOMERS  AND BACKLOG.   Sales to  U.S. government  agencies and commercial
customers primarily serving the U.S. government constitute a significant portion
of Cray's business. The contract value of  Cray's backlog at March 31, 1996  was
$438  million (not all of which is  expected to be installed in 1996), including
approximately $172 million in  orders from U.S.  government agencies or  related
commercial  customers.  In general,  these customers  place orders  that include
standard termination  for  convenience  clauses used  in  most  U.S.  government
contracts.  Perceived uncertainties relating  to the Merger or  the status of or
plans for Cray  following the Merger  could disrupt the  marketing and sales  of
Cray  systems and might result in the  cancellation of backlog orders. The loss,
delay or cancellation  of business  from major Cray  customers could  materially
affect the results of operations of the combined company.
 
RISKS RELATING TO SILICON GRAPHICS
 
    As  is true for technology companies generally, Silicon Graphics operates in
a rapidly changing environment  that involves a number  of risks, some of  which
are beyond its control. The following discussion highlights some of these risks.
 
    PERIOD  TO  PERIOD FLUCTUATIONS.   Silicon  Graphics' operating  results may
fluctuate for  a number  of  reasons. Other  than  in Cray's  business,  Silicon
Graphics  has short delivery cycles and as a  result does not have a large order
backlog, which  makes  the forecasting  of  revenue inherently  uncertain.  This
uncertainty  is compounded because each  quarter's revenue results predominantly
from orders booked and shipped during the third month, and disproportionately in
the latter half  of that  month. Because  Silicon Graphics  plans its  operating
expenses,  many of which  are relatively fixed  in the short  term, on the basis
that its  revenues  will continue  to  grow,  even a  relatively  small  revenue
shortfall may cause a
 
                                       12
<PAGE>
period's  results  to  be  substantially  below  expectations.  Such  a  revenue
shortfall could arise from any number  of factors including lower than  expected
demand,  supply constraints, delays in the availability of new products, transit
interruptions, overall economic conditions or  natural disasters. The timing  of
customer  acceptance of large Cray systems may also have a significant effect on
periodic  operating   results.   Margins   are   heavily   influenced   by   mix
considerations, including geographical mix, the mix of service and non-recurring
engineering  revenues, the mix of high-end  and desktop products and application
software and the mix of configurations within these product categories.
 
    Silicon Graphics' results  have followed a  seasonal pattern, with  stronger
sequential  growth  in the  second and  fourth  fiscal quarters,  reflecting the
buying patterns of Silicon Graphics' customers. Sales of Cray systems  generally
reflect sequential growth from quarter-to-quarter through the calendar year.
 
    Silicon  Graphics' stock price, like that  of other technology companies, is
subject to significant volatility. If revenues  or earnings in any quarter  fail
to  meet the  investment community's expectations,  there could  be an immediate
impact on Silicon Graphics' stock price. The stock price may also be affected by
broader market trends unrelated to Silicon Graphics' performance.
 
    PRODUCT DEVELOPMENT AND INTRODUCTION.   Silicon Graphics' continued  success
depends  on its ability to develop and rapidly bring to volume production highly
differentiated,  technologically  complex   and  innovative  products.   Silicon
Graphics  recently introduced a number of  significant new products and plans to
introduce more in the first half of fiscal 1997, including products that replace
current products. A number of risks are inherent in this process.
 
    The development of new technology  and products is increasingly complex  and
uncertain,  which  increases  the risk  of  delays.  The introduction  of  a new
computer  system  requires  close  collaboration  and  continued   technological
advancement  involving multiple  hardware and software  design and manufacturing
teams within  Silicon Graphics  as well  as teams  at outside  suppliers of  key
components such as semiconductor and storage products. The failure of any one of
these  elements  could cause  Silicon  Graphics' new  products  to fail  to meet
specifications or  to  miss  the aggressive  timetables  that  Silicon  Graphics
establishes. As the variety and complexity of Silicon Graphics' product families
increase,  the process of planning production  and inventory levels also becomes
more difficult.
 
    Short product life cycles  place a premium on  Silicon Graphics' ability  to
manage  the  transition  from current  products  to  new products.  In  order to
minimize product  transition issues,  Silicon Graphics  generally announces  new
products  in the  early part  of a quarter,  while the  product is  in the final
stages of development, and seeks to  manufacture and ship the product in  volume
in  the same  quarter. In the  case of the  Cray product line,  new products are
generally announced well  in advance of  availability, due to  the longer  sales
cycle  for these systems. Silicon Graphics'  results could be adversely affected
by such factors as  development or manufacturing  delays, variations in  product
costs,  and delays in customer purchases of existing products in anticipation of
the introduction of new products.
 
    ACQUISITION OF CRAY.   The  acquisition of  Cray will  require, among  other
things,  integration  of  the  Cray  organization,  business  infrastructure and
product offerings with  those of  Silicon Graphics in  a way  that enhances  the
performance  of the combined  business. The challenges  posed by the acquisition
include the  management of  a  business with  a  different approach  to  product
design,  manufacturing and sales and service,  the development of a consolidated
product road map from a number  of incompatible products and the integration  of
several  geographically separated research and  development centers. The success
of this process will be significantly influenced by Silicon Graphics' ability to
retain key  management,  sales,  and research  and  development  personnel.  The
integration  process will also  require the dedication  of management resources,
which may temporarily distract attention from the day-to-day business of Silicon
Graphics.
 
    There are several other aspects of  Cray's business that are different  from
Silicon Graphics' current business and may affect the operations of the combined
business:
 
                                       13
<PAGE>
    - Government  agencies and research institutions  represent a major customer
      group for Cray products. Following  the acquisition, a greater  percentage
      of  Silicon  Graphics'  revenues  will  be  derived  from  sales  to  such
      customers,  whose  purchasing  decisions  may  be  adversely  affected  by
      reductions or changes in government spending.
 
    - International  sales of Cray's  products are more likely  to be subject to
      export licensing constraints than international sales of Silicon Graphics'
      current products.
 
    - Cray derives a  significant portion  of its revenues  from the  sale of  a
      small  number of large systems, which generally have a longer sales cycle.
      Cray's periodic  operating results  are  significantly influenced  by  the
      number  of  Cray  systems  accepted  by  customers  in  that  period,  the
      configuration of the  systems accepted  and whether  a system  is sold  or
      leased.  Changes  affecting  even  a  small  number  of  systems  can have
      significant financial implications.
 
    - At March 31, 1995, the contract  value of Cray's backlog was $438  million
      (not  all of which is expected to be installed in calendar 1996) including
      approximately $172  million in  orders from  U.S. government  agencies  or
      related  commercial customers.  In general,  these customers  place orders
      that include standard  termination for  convenience clauses  used in  most
      U.S. government contracts.
 
    REVENUE GROWTH.  In late fiscal 1995 and early fiscal 1996, Silicon Graphics
made  substantial investments in  its sales and  marketing organizations, in new
research and development  programs and increased  funding of existing  programs,
and  investments  in corporate  infrastructure  required to  support significant
growth. This  plan involved  a number  of  risks, including  a higher  level  of
operating expenses, the difficulty of attracting and assimilating a large number
of  new employees,  and the complexities  associated with managing  a larger and
faster growing organization.
 
    In the first nine  months of fiscal 1996,  Silicon Graphics' revenue  growth
rate  decreased to 23% over  the prior year period,  and operating margins moved
below Silicon Graphics'  target model. Silicon  Graphics' operating expenses  in
the current quarter are expected to be somewhat higher than in the third quarter
of  fiscal  1996. As  a  consequence, whether  operating  margin will  return to
Silicon Graphics' target model in the fourth quarter will depend on the  quarter
to quarter growth in revenues.
 
    INTERNATIONAL  OPERATIONS.   Because  more  than half  of  Silicon Graphics'
revenues are from sales outside the  United States, and many key components  are
produced   outside  the  United  States,  Silicon  Graphics'  results  could  be
negatively affected  by such  factors as  changes in  foreign currency  exchange
rates  (international  sales are  generally  denominated in  foreign currencies,
while  Silicon  Graphics'  accounts  are  in  U.S.  dollars),  trade  protection
measures, longer accounts receivable collection patterns, changes in regional or
worldwide economic or political conditions, or natural disasters. For example, a
marked  short-term appreciation in the value of  the U.S. dollar relative to the
Japanese yen or German  mark could adversely  affect Silicon Graphics'  results.
Silicon  Graphics'  sales  to  foreign  customers  also  are  subject  to export
regulations, with sales of some of Silicon Graphics' high-end products requiring
clearance and  export licenses  from the  U.S. Department  of Commerce.  Silicon
Graphics'  export sales  would be  adversely affected  if such  regulations were
tightened, or  if they  are not  modified over  time to  reflect the  increasing
performance of Silicon Graphics' products.
 
    Sales  in foreign countries are generally priced in local currencies and are
thus subject to the effects of currency exchange fluctuations. Silicon  Graphics
attempts to reduce the impact (positive or negative) of currency fluctuations on
net  income primarily through the use  of forward exchange contracts and foreign
currency options that hedge foreign currency denominated receivables between the
parent and its  international subsidiaries. Silicon  Graphics has generally  not
hedged capital expenditures, investments in subsidiaries, inventory purchases or
most  future  international  revenues, although  it  periodically  evaluates its
hedging practices.
 
    MANAGEMENT INFORMATION SYSTEM.  Silicon Graphics replaced its United  States
information  management  system  in the  third  quarter  of fiscal  1996  with a
comprehensive system used to manage the
 
                                       14
<PAGE>
entire revenue cycle, including order administration, billing and collection, as
well as manufacturing and finance. Silicon Graphics expects that the system will
provide operational  efficiencies and  support future  growth. However,  as  the
system has been in operation for a relatively short period, there remains a risk
of  functional or performance difficulties, particularly  in light of the higher
volume of transactions normally experienced in the fourth fiscal quarter.
 
    DEVELOPMENT   AND    ACCEPTANCE   OF    MIPS-REGISTERED   TRADEMARK-    RISC
ARCHITECTURE.     Most   of  Silicon   Graphics'  system   products  incorporate
microprocessors  based   upon  Silicon   Graphics'  MIPS   RISC   microprocessor
architecture.  Silicon  Graphics  licenses  the  manufacturing  and distribution
rights  to  these  microprocessors   to  selected  semiconductor   manufacturing
companies.  Silicon Graphics believes  that the continued  development and broad
acceptance of the MIPS architecture are critical to its future success.
 
    INTELLECTUAL PROPERTY.  Silicon  Graphics routinely receives  communications
from  third parties asserting patent or  other rights covering Silicon Graphics'
products and technologies. Based upon Silicon Graphics' evaluation, it may  take
no  action or it may seek to obtain a license. In any given case there is a risk
that a license will  not be available on  terms that Silicon Graphics  considers
reasonable,  or  that litigation  will  ensure. Silicon  Graphics  currently has
patent infringement lawsuits pending against it. Silicon Graphics expects  that,
as the number of hardware and software patents issued continues to increase, and
as  Silicon Graphics' business grows, the  volume of these intellectual property
claims will also increase.
 
    COMPETITION.   The  computer  industry is  highly  competitive,  with  rapid
technological  advances and  constantly improving price/performance.  As most of
the segments in which Silicon Graphics operates continue to grow faster than the
industry  as  a  whole,  Silicon   Graphics  is  experiencing  an  increase   in
competition,  and it expects this trend  to continue. This competition comes not
only from  Silicon  Graphics' traditional  UNIX  workstation rivals  and  Cray's
traditional  supercomputing competitors, but also from new sources including the
personal  computer  industry.  Many   of  Silicon  Graphics'  competitors   have
substantially  greater technical, marketing and financial resources and, in some
segments, a larger installed  base of customers and  a wider range of  available
applications  software. Competition  can result  in significant  discounting and
lower gross margins.
 
    EMPLOYEES.  Silicon Graphics' future success depends in part on its  ability
to  continue  to  attract,  retain  and  motivate  highly  qualified  technical,
marketing and management personnel, who are in great demand.
 
    BUSINESS DISRUPTION.   Silicon Graphics'  corporate headquarters,  including
most  of its research  and development operations  and manufacturing facilities,
are located in the  Silicon Valley area of  Northern California, a region  known
for  seismic  activity.  Operating results  could  be materially  affected  by a
significant earthquake.  Silicon  Graphics  is  predominantly  self-insured  for
losses and business interruptions of this kind.
 
                                       15
<PAGE>
                              THE SPECIAL MEETING
 
GENERAL
 
    This Proxy Statement/Prospectus is being furnished to holders of Cray Common
Stock  in connection with the solicitation of  proxies by the Cray Board for use
at the Special Meeting to  be held at Cray's  headquarters, 655 Lone Oak  Drive,
Eagan,  Minnesota 55121 at 10:00 a.m., local  time, on Wednesday, June 26, 1996,
or at any  adjournments or  postponements thereof,  for the  purposes set  forth
herein  and in  the accompanying  Notice of  Special Meeting  of Stockholders of
Cray.
 
MATTERS TO BE CONSIDERED AT THE SPECIAL MEETING
 
    At the Special Meeting, stockholders  of record of Cray  as of the close  of
business on May 8, 1996 will be asked to consider and vote upon proposals (i) to
approve  and  adopt the  Merger Agreement  and  to approve  the Merger,  (ii) to
approve and ratify the Plan Amendment and (iii) to transact such other  business
as  may  properly  come  before  the Special  Meeting  or  any  postponements or
adjournments thereof.
 
    THE CRAY  BOARD  HAS  UNANIMOUSLY  APPROVED THE  MERGER  AGREEMENT  AND  THE
TRANSACTIONS CONTEMPLATED THEREBY, INCLUDING THE MERGER, AND THE PLAN AMENDMENT,
AND  RECOMMENDS A VOTE BY THE STOCKHOLDERS  OF CRAY FOR APPROVAL AND ADOPTION OF
THE MERGER AGREEMENT, APPROVAL  OF THE MERGER AND  APPROVAL AND RATIFICATION  OF
THE PLAN AMENDMENT.
 
RECORD DATE; VOTING AT THE SPECIAL MEETING; VOTE REQUIRED
 
    The  Cray  Board  has  fixed  May  8,  1996  as  the  record  date  for  the
determination of the stockholders of Cray entitled  to notice of and to vote  at
the  Special Meeting. Only holders of record  of Cray Common Stock on the record
date will be entitled to notice of and to vote at the Special Meeting. As of May
8, 1996,  there were  26,152,736 shares  of Cray  Common Stock  outstanding  and
entitled to vote, which were held by approximately 4,317 holders of record. Each
record  holder of Cray Common  Stock on the record date  is entitled to cast one
vote per share,  exercisable in person  or by properly  executed proxy, on  each
matter  properly  submitted for  the vote  of  the stockholders  of Cray  at the
Special Meeting.
 
    The presence, in person or by properly  executed proxy, of the holders of  a
majority  of the outstanding shares of Cray Common Stock entitled to vote at the
Special Meeting is necessary to constitute a quorum at the Special Meeting.  The
approval  of the  Merger Agreement and  the Merger will  require the affirmative
vote of the holders  of at least  a majority of the  outstanding shares of  Cray
Common Stock entitled to vote thereon. Abstentions and broker non-votes will not
be  counted, but  will have the  practical effect  of a vote  against the Merger
Agreement and the Merger  since they represent one  less vote for approval.  The
approval  of the Plan Amendment will require  the affirmative vote of at least a
majority of the votes cast thereon.
 
    As of May  8, 1996,  directors, executive  officers and  affiliates of  Cray
(including   Merger  Sub)  may  be  deemed   to  be  the  beneficial  owners  of
approximately 76% of the outstanding shares of Cray Common Stock. The  directors
and  executive officers of Cray and Merger  Sub have indicated that they plan to
vote or direct the vote of all shares of Cray Common Stock over which they  have
voting  control  in favor  of  the Merger  Agreement,  the Merger  and  the Plan
Amendment.
 
    BECAUSE MERGER SUB  HAS ACQUIRED  MORE THAN  A MAJORITY  OF THE  OUTSTANDING
SHARES  OF  CRAY  COMMON  STOCK,  MERGER  SUB  HAS  SUFFICIENT  VOTING  POWER TO
CONSTITUTE A QUORUM AT THE SPECIAL MEETING  AND TO APPROVE AND ADOPT THE  MERGER
AGREEMENT, APPROVE THE MERGER AND APPROVE AND RATIFY THE PLAN AMENDMENT, EVEN IF
NO  OTHER STOCKHOLDER  OF CRAY VOTES  IN FAVOR OF  THESE PROPOSALS. ACCORDINGLY,
APPROVAL AND  ADOPTION OF  THE  MERGER AGREEMENT,  APPROVAL  OF THE  MERGER  AND
APPROVAL  AND  RATIFICATION OF  THE  PLAN AMENDMENT  AT  THE SPECIAL  MEETING IS
ASSURED.
 
PROXIES
 
    This Proxy Statement/Prospectus is being furnished to holders of Cray Common
Stock in connection with  the solicitation of  proxies by and  on behalf of  the
Cray Board for use at the Special Meeting.
 
                                       16
<PAGE>
    All  shares  of  Cray  Common  Stock  that  are  entitled  to  vote  and are
represented at the Special Meeting  by properly executed proxies received  prior
to  or at the Special Meeting and not  duly and timely revoked, will be voted at
the Special  Meeting  in accordance  with  the instructions  indicated  on  such
proxies.  If  no instructions  are  indicated, such  proxies  will be  voted FOR
approval and  adoption of  the  Merger Agreement,  approval  of the  Merger  and
approval and ratification of the Plan Amendment.
 
    If any other matters are properly presented for consideration at the Special
Meeting  (or any adjournments or  postponements thereof), including, among other
things, consideration of a motion to adjourn or postpone the Special Meeting  to
another  time and/or  place (including, without  limitation, for  the purpose of
soliciting additional proxies), the persons named in the enclosed forms of proxy
and voting thereunder will have discretion to vote on such matters in accordance
with their best judgment.
 
    Any proxy given pursuant to this  solicitation may be revoked by the  person
giving  it at any time before it is  voted. Proxies may be revoked by (i) filing
with the Secretary of Cray  at or before the taking  of the vote at the  Special
Meeting,  a written notice  of revocation bearing  a later date  than the proxy,
(ii) duly  executing  a  later dated  proxy  relating  to the  same  shares  and
delivering  it to the  Secretary of Cray  before taking the  vote at the Special
Meeting or (iii) attending  the Special Meeting and  voting in person  (although
attendance  at  the Special  Meeting  will not  in  and of  itself  constitute a
revocation of a  proxy). Any written  notice of revocation  or subsequent  proxy
should  be sent  so as  to be delivered  to Cray  Research, Inc.,  655A Lone Oak
Drive, Eagan,  Minnesota  55121,  Attention: John  L.  Sullivan,  Esq.,  General
Counsel  and Secretary, or hand-delivered to the  Secretary of Cray at or before
taking the vote at the Special Meeting.
 
    In addition to solicitation by use of the mails, proxies may be solicited by
directors, officers and employees of Cray in person or by telephone, telegram or
other means of communication. Such directors, officers and employees will not be
additionally compensated,  but may  be reimbursed  for reasonable  out-of-pocket
expenses  in connection with  such solicitation. Arrangements  will also be made
with custodians,  nominees and  fiduciaries  for forwarding  proxy  solicitation
materials  to beneficial  owners of  shares held  of record  by such custodians,
nominees and fiduciaries, and Cray will reimburse such custodians, nominees  and
fiduciaries for reasonable expenses incurred in connection therewith.
 
                                   THE MERGER
 
GENERAL
 
    Under  the Merger Agreement, Merger Sub will merge with and into Cray, which
will continue as the surviving corporation. At the Effective Time of the Merger,
(i) each outstanding share of Cray  Common Stock (other than Ineligible  Shares)
will be converted into the right to receive one share of Silicon Graphics Common
Stock,  (ii) each  treasury share of  Cray and  each share of  Cray Common Stock
owned by Merger Sub, Silicon Graphics or any wholly owned subsidiary of  Silicon
Graphics  or Cray will be  cancelled and (iii) each  outstanding share of common
stock of Merger Sub will  be converted into one share  of Cray Common Stock.  No
fractional shares of Silicon Graphics Common Stock will be issued in the Merger.
Cray  will  become  a  wholly  owned subsidiary  of  Silicon  Graphics,  and the
stockholders of  Cray will  become stockholders  of Silicon  Graphics. See  "The
Merger Agreement and Related Agreements -- Conversion of Shares."
 
    Upon  consummation of the Merger, each  then-outstanding Cray Option will be
assumed by Silicon Graphics and will  automatically be converted into an  option
to  purchase that  number of  shares of Silicon  Graphics Common  Stock that the
holder of such Cray Option would have  been entitled to receive pursuant to  the
Merger  had such holder exercised such Cray  Option in full immediately prior to
the Effective Time. The per share exercise price for the Silicon Graphics Common
Stock issuable upon exercise of  such assumed Cray Option  will be equal to  the
per  share exercise  price of  such Cray Option  at the  Effective Time. Silicon
Graphics  will   file  a   Registration   Statement  on   Form  S-8   with   the
 
                                       17
<PAGE>
Commission  with respect to the issuance of  Silicon Graphics Common Stock to be
issued upon exercise of the assumed Cray Options. See "The Merger Agreement  and
Related  Agreements--Treatment  of  Cray Common  Stock  Options;  Employee Stock
Purchase Plan and Convertible Debentures."
 
    Subject to the consummation of the Merger, on the Final Purchase Date,  Cray
will  apply any funds then credited  to each Purchase Plan participant's payroll
withholding account to the  purchase of whole shares  of Cray Common Stock.  See
"The  Merger Agreement and  Related Agreements-- Treatment  of Cray Common Stock
Options and Employee Stock Purchase Plan."
 
    Under the Merger  Agreement, the Convertible  Debentures shall, pursuant  to
the  terms of the Indenture become  thereafter convertible only into that number
of shares of  Silicon Graphics  Common Stock (plus  cash in  lieu of  fractional
shares)  that the holder of any  such Convertible Debentures would have received
if such holder had converted such Convertible Debentures into Cray Common  Stock
immediately prior to the Effective Time.
 
BACKGROUND OF THE MERGER
 
    Based  upon past and  anticipated conditions within  the technology industry
and Cray's operations, the  Cray Board has from  time to time considered  making
acquisitions,   forming   strategic   alliances  and   entering   into  business
combinations with companies engaged in a similar or related business. Since 1994
Cray has had  occasional discussions  with other  companies regarding  potential
strategic alliances and other opportunities for collaboration.
 
    On  October 5,  1995, the Executive  Committee of the  Cray Board determined
that it would be in the best interests of Cray and its stockholders for Cray  to
take an active approach in pursuing opportunities with other companies. The Cray
Board  also authorized  the executive officers  of Cray to  engage an investment
banking firm to assist Cray with these efforts.
 
    On October 9, 1995, Cray retained Salomon Brothers on an exclusive basis  to
render  financial advisory and investment banking services to Cray in connection
with a possible combination with, or sale of a controlling interest in Cray  to,
another corporation or other business entity. Cray's efforts were not limited to
acquisition discussions.
 
    On  November 21,  1995, members  of management  met with  representatives of
Salomon Brothers and  analyzed and discussed  potential strategic alliances.  In
December,  Cray communicated to  representatives of several  companies that Cray
was interested in exploring opportunities for collaboration, strategic  alliance
or  some  form  of  business  combination.  Discussions  with  certain  of these
companies followed.
 
    In late 1995,  senior executives  at Cray approached  their counterparts  at
Silicon  Graphics to suggest the possibility of a business combination involving
the two companies. A confidentiality agreement with respect to these discussions
was entered  into  in  December  1995,  and  shortly  thereafter  a  meeting  of
representatives  of the two companies was  held at Cray's headquarters in Eagan,
Minnesota. At that meeting, the  parties discussed their respective product  and
technology  plans  and  financial  outlooks, and  how  the  two  companies might
consolidate their  operations  in  the  event  of  a  business  combination.  No
acquisition  proposal was made at or following this meeting, but representatives
of the two companies continued to be in communication, and a follow-up  meeting,
including  each  company's  financial  and legal  representatives,  was  held in
California on January 22, 1996.
 
    On  February  3,  1996  representatives  of  Cray  had  a  discussion   with
representatives  of  Silicon Graphics  in which  Silicon Graphics  expressed the
interest of Silicon Graphics' Board of Directors (the "Silicon Graphics  Board")
in  a  business combination  with Cray  whereby  Cray would  be maintained  as a
separate operating unit. Silicon Graphics and Cray discussed the timetable for a
due diligence  evaluation  of Cray  in  connection with  the  proposed  business
combination.
 
    On  February  5, 1996,  a  regular meeting  of the  Cray  Board was  held to
discuss, among other things, Cray's strategic partnering efforts as well as  the
recent  communications between  representatives of  Cray and  representatives of
Silicon   Graphics.    At    this   meeting,    Cray's    management    reviewed
 
                                       18
<PAGE>
communications  with Silicon Graphics, the respective technological abilities of
Silicon Graphics and Cray as well as the potential synergies of a combination of
Cray with Silicon Graphics and other matters related thereto. At the  conclusion
of  the meeting,  the Cray  Board determined  that it  would be  consistent with
Cray's objectives to  continue to  investigate a  possible business  combination
with Silicon Graphics as well as other possible strategic alternatives for Cray.
 
    On  February 13, 1996,  at a special  meeting of the  Cray Board, management
reviewed the status  of its continuing  discussions. Representatives of  Salomon
Brothers  then reviewed  the environment in  which Cray  operates, the pressures
facing  industry   participants,  strategies   undertaken  by   other   industry
participants,  the reaction of the stock  market to major industry transactions,
public trading values of Silicon Graphics  and Cray, valuations of Cray and  the
methodology by which such valuations were derived.
 
    On   February  14,   1996  the  parties   and  their   financial  and  legal
representatives met to discuss whether a business combination could be agreed to
on terms  acceptable  to both  sides.  The parties  discussed  several  possible
transaction  structures and values. After  further discussions and negotiations,
which continued into the following day, the parties agreed to discuss with their
boards of directors a transaction valued at  $30 per share of Cray Common  Stock
in  cash for 75%  of the shares  of Cray Common  Stock and one  share of Silicon
Graphics Common Stock for each remaining share of Cray Common Stock.
 
    On February 18, 1996, a special meeting  of the Cray Board was held. At  the
meeting,  the executive officers indicated  that Silicon Graphics was interested
in  acquiring  Cray,  subject  to  further  due  diligence,  negotiation  of   a
satisfactory agreement, approval by the Silicon Graphics Board and certain other
conditions,  pursuant to a cash  tender offer to acquire  75% of the outstanding
shares of Cray Common Stock  for $30 per share, net  to the seller in cash,  and
followed  by  a  merger in  which  each  share of  Cray  Common  Stock remaining
outstanding would be converted  into the right to  receive one share of  Silicon
Graphics  Common  Stock.  At  the  conclusion of  the  meeting,  the  Cray Board
determined that  Cray should  continue  to negotiate  the  terms of  a  business
combination  with Silicon Graphics,  including but not limited  to the terms and
provisions of a  merger agreement, which  would be subject  to final review  and
approval by the Cray Board.
 
    During  the week of  February 19, 1996, the  parties conducted due diligence
investigations of each other's businesses, negotiated the terms of a  definitive
merger  agreement  and, beginning  in the  afternoon of  February 23,  1996, had
meetings and telephone calls with certain  key customers of Cray to discuss  the
potential transaction.
 
    On February 20, 1996, the Silicon Graphics Board met by telephone conference
with  Silicon Graphics'  management and  financial and  legal representatives to
review the results of the negotiations held on February 14, 1996 and to  discuss
a preliminary draft of the Merger Agreement.
 
    On February 25, 1996, the Silicon Graphics Board met by telephone conference
with  Silicon Graphics'  management and  financial and  legal representatives to
review the results of Silicon Graphics' due diligence investigation of Cray  and
the  terms of the  proposed Merger Agreement, which  was unanimously approved at
this meeting.
 
    On February 25, 1996, a special meeting of the Cray Board was held. At  such
meeting,  the Cray Board reviewed with  certain of its executive officers, legal
counsel and financial advisors the discussions and negotiations between Cray and
Silicon Graphics. Following such discussions, the Cray Board heard presentations
by its  legal counsel  on the  terms and  conditions contained  in the  proposed
merger  agreement  and  by Salomon  Brothers  on  its analysis  of  the proposed
transaction. Representatives of Salomon Brothers then discussed matters  related
to  the proposed transaction  with Silicon Graphics. At  the conclusion of their
presentation, Salomon  Brothers delivered  its oral  opinion to  the Cray  Board
(subsequently  confirmed  by  a written  opinion)  that,  as of  such  date, the
consideration to be received by  the holders of shares  of Cray Common Stock  in
the  Transaction is fair, from a financial point of view, to the stockholders of
Cray.  Thereafter,   the   Cray  Board   authorized   the  Offer,   the   Merger
 
                                       19
<PAGE>
and the execution and delivery of the Merger Agreement substantially in the form
presented  to it; and recommended that the stockholders of Cray accept the Offer
and tender their  shares to Silicon  Graphics and approve  and adopt the  Merger
Agreement.
 
    The  Merger Agreement  was executed  that evening  and announced  before the
opening of trading on the NYSE on the following morning.
 
    On February 29, 1996, Merger Sub commenced the Offer.
 
    On April 2, 1996,  Merger Sub accepted for  payment, and thereby  purchased,
19,218,735  Shares pursuant to  the Offer. The aggregate  purchase price for the
19,218,735 shares  of Cray  Common Stock  purchased pursuant  to the  Offer  was
$576,562,050.  Merger Sub  obtained the funds  to acquire the  Cray Common Stock
through a  capital  contribution  from Silicon  Graphics  and  Silicon  Graphics
obtained the necessary funds for such capital contribution from cash on hand and
from  its existing Credit Agreement, dated as  of December 31, 1994, as amended,
between Silicon  Graphics  and  Bank  of America,  National  Trust  and  Savings
Association.
 
    On  April 3, 1996, four members of the  Cray Board were replaced by four new
directors nominated by Merger Sub. The  directors elected to the Cray Board  are
Edward  R. McCracken,  Thomas A.  Jermoluk, Stanley  J. Meresman  and William M.
Kelly. The directors who were replaced are J. Phillip Samper, Philip G. Heasley,
Robert G. Potter and Jan H. Suwinski.
 
CRAY'S REASONS FOR THE MERGER; RECOMMENDATION OF THE CRAY BOARD
 
    On February  25,  1996,  the  Cray Board  unanimously  approved  the  Merger
Agreement and the transactions contemplated thereby, including the Offer and the
Merger.  The Cray  Board unanimously recommends  to Cray  stockholders that they
vote for the approval of the Merger and the approval and adoption of the  Merger
Agreement. The Board of Directors based its approval of the Merger upon a number
of factors, including:
 
        1.   the  financial and  other terms  and conditions  of the  Offer, the
    Merger and the Merger Agreement;
 
        2.  the presentation of Salomon  Brothers at the February 25, 1996  Cray
    Board's meeting and the opinion of Salomon Brothers (the "Opinion") that, as
    of  the date of  the Opinion and  based upon and  subject to certain matters
    stated therein, the consideration to be received by the Cray stockholders in
    the Transaction is fair,  from a financial point  of view, to such  holders.
    The full text of the Opinion, which sets forth the assumptions made, general
    procedures  followed,  matters  considered  and  limitations  on  the review
    undertaken by  Salomon  Brothers, is  attached  hereto  as Annex  B  and  is
    incorporated herein by reference. Stockholders are urged to read the Opinion
    carefully in its entirety;
 
        3.   the  possible alternatives  to the  Transaction, including, without
    limitation, continuing  to operate  Cray as  an independent  entity and  the
    risks associated therewith;
 
        4.   the  familiarity of  the Cray Board  with the  business, results of
    operations, properties and financial condition of Cray and the nature of the
    industry in which it operates;
 
        5.   the  compatibility of  the  business and  operating  strategies  of
    Silicon Graphics and Cray;
 
        6.    the fact  that  the Merger  Agreement,  which prohibits  Cray, its
    subsidiaries  and   their   respective   officers,   directors,   employees,
    representatives,   agents  or  affiliates  from  initiating,  soliciting  or
    knowingly encouraging any potential Acquisition Proposal (as defined in  the
    Merger Agreement), does permit Cray to furnish non-public information to, or
    to  enter into, maintain or continue  discussions and negotiations with, any
    person or  entity  that makes  an  unsolicited inquiry,  offer  or  proposal
    relating  to an Acquisition Proposal after the date of the Merger Agreement,
    if the Cray Board, after consultation with its financial advisors and  based
    upon  an opinion of counsel, determines that it is necessary to do so in the
    exercise of its fiduciary duties;
 
                                       20
<PAGE>
        7.  the fact that in the event  that the Cray Board decided to accept  a
    Superior Proposal (as defined in the Merger Agreement) of a third party, the
    Cray  Board could terminate the Merger  Agreement and pay Silicon Graphics a
    termination  fee  of  $25  million  plus  actual  documented  expenses   and
    reasonable  out-of-pocket  expenses of  Silicon Graphics,  not in  excess of
    $2.5, million  relating  to  the transactions  contemplated  by  the  Merger
    Agreement  (including,  but not  limited to,  fees  and expenses  of Silicon
    Graphics' counsel) (or  approximately $1.00  per outstanding  share of  Cray
    Common  Stock). The Cray  Board, after considering,  among other things, the
    advice of Salomon Brothers, did not believe that such termination  provision
    would  be  a  significant deterrent  to  a  higher offer  by  a  third party
    interested in acquiring Cray;
 
        8.  the  fact that the  terms of  the Merger Agreement  should not  have
    unduly  discouraged  other third  parties  from making  bona  fide proposals
    subsequent to  the  execution of  the  Merger  Agreement and,  if  any  such
    proposals  were made, Cray,  in the exercise of  its fiduciary duties, could
    determine to provide information to and engage in negotiations with any such
    third party; and
 
        9.    the  regulatory  approvals  required  to  consummate  the  Merger,
    including,   among  others,  antitrust  approvals,  and  the  prospects  for
    receiving such approvals.
 
    The Cray Board did not assign  relative weights to the factors or  determine
that  any factor was of particular importance. Rather, the Cray Board viewed its
position and recommendation as  being based on the  totality of the  information
presented to and considered by it.
 
SILICON GRAPHICS' REASONS FOR THE MERGER
 
    Silicon Graphics is engaging in the Merger in order to acquire all shares of
Cray Common Stock not purchased by Merger Sub in the Offer.
 
OPERATIONS FOLLOWING THE MERGER
 
    It  is  expected  that, initially  following  the Merger,  the  business and
operations of Cray will, except as set forth in this Proxy Statement/Prospectus,
be continued  by  Cray substantially  as  they are  currently  being  conducted.
Silicon  Graphics will continue to evaluate  the business and operations of Cray
after the consummation  of the Merger  and will  take such actions  as it  deems
appropriate under the circumstances then existing.
 
    Except  as  indicated  in  this Proxy  Statement/Prospectus  and  except for
changes normally associated with the conversion to the status of a  wholly-owned
subsidiary,  Silicon Graphics does not have any present plans or proposals which
relate to or would result in  an extraordinary corporate transaction, such as  a
merger,   reorganization  or   liquidation,  involving   Cray  or   any  of  its
subsidiaries, a sale or transfer of a  material amount of assets of Cray or  any
of  its subsidiaries or any material change in Cray's capitalization or dividend
policy or any other material changes in Cray's corporate structure or  business.
Silicon  Graphics  expects that  the Merger  will  change its  current financial
target model  in several  respects,  including a  decline  in gross  margin.  In
addition,  for the fourth quarter of fiscal 1996 and for fiscal 1997 as a whole,
Silicon Graphics'  results  will be  adversely  affected by  several  short-term
purchase accounting impacts and other Merger related expenses. These matters are
discussed  in detail in Silicon Graphics' Form  10-Q for the quarter ended March
31, 1996, which is incorporated by reference in this Proxy Statement/Prospectus.
 
OPINION OF CRAY'S FINANCIAL ADVISOR
 
    Cray retained Salomon Brothers pursuant to a letter agreement dated  October
9,  1995 (the "Engagement Letter") to act as its financial advisor in connection
with  a  possible  combination  transaction  involving  Cray.  Pursuant  to  the
Engagement   Letter,  Salomon  Brothers  rendered  financial  advisory  services
relating to  the Transaction.  Salomon Brothers  rendered an  opinion to  Cray's
Board  on February 25, 1996 that the consideration to be received by the holders
of Cray Common Stock in the Transaction is fair to such holders from a financial
point of view.
 
    The full text of  Salomon Brothers' fairness opinion,  which sets forth  the
assumptions  made, general procedures followed, matters considered and limits on
the review undertaken, is attached as
 
                                       21
<PAGE>
Annex B  to  this  Proxy  Statement/Prospectus.  Salomon  Brothers'  opinion  is
directed only to the fairness, from a financial point of view, to the holders of
Cray  Common Stock of  the consideration to  be received by  such holders in the
Transaction and does not address  Cray's underlying business decision to  effect
the  Transaction or  constitute a  recommendation to  any holder  of Cray Common
Stock as to how  such stockholder should  vote with respect  to the Merger.  The
summary  of  Salomon  Brothers' opinion  set  forth  below is  qualified  in its
entirety by reference  to the full  text of  such opinion attached  as Annex  B.
STOCKHOLDERS ARE URGED TO READ THE OPINION IN ITS ENTIRETY.
 
    In  connection  with rendering  its opinion,  Salomon Brothers  reviewed and
analyzed, among other things, the following:  (i) the final draft of the  Merger
Agreement;   (ii)  certain  publicly   available  information  concerning  Cray,
including the Annual Reports on Form 10-K of  Cray for each of the years in  the
three year period ended December 31, 1994 and the Quarterly Reports on Form 10-Q
of  Cray  for the  quarters  ended September  30, June  30  and March  31, 1995,
respectively; (iii) certain other  internal information, primarily financial  in
nature,  including projections, concerning  the business and  operations of Cray
furnished to Salomon Brothers by Cray for purposes of its analysis; (iv) certain
publicly available information concerning the trading of, and the trading market
for, Cray Common  Stock; (v) certain  publicly available information  concerning
Silicon  Graphics, including the Annual Reports on Form 10-K of Silicon Graphics
for each of  the years  in the three  year period  ended June 30,  1995 and  the
Quarterly  Reports  on Form  10-Q  of Silicon  Graphics  for the  quarters ended
December 31 and September  30, 1995, respectively;  (vi) certain other  internal
information,  primarily financial  in nature,  including projections, concerning
the business and operations of Silicon Graphics furnished to Salomon Brothers by
Silicon Graphics for purposes of its analysis; (vii) certain publicly  available
information  concerning  the trading  of, and  the  trading market  for, Silicon
Graphics Common  Stock;  (viii)  certain  publicly  available  information  with
respect  to  certain  other  companies  that  Salomon  Brothers  believed  to be
comparable to Cray or  Silicon Graphics and the  trading markets for certain  of
such   other  companies'   securities;  and  (ix)   certain  publicly  available
information concerning the nature and  terms of certain other transactions  that
Salomon  Brothers  considered relevant  to  its inquiry.  Salomon  Brothers also
considered such other information,  financial studies, analyses,  investigations
and  financial, economic  and market criteria  that it  deemed relevant. Salomon
Brothers also  met with  certain  officers and  employees  of Cray  and  Silicon
Graphics  to discuss  the foregoing  as well  as other  matters Salomon Brothers
believed relevant to its inquiry.
 
    In its review and analysis and in arriving at its opinion, Salomon  Brothers
assumed  and relied upon the  accuracy and completeness of  all of the financial
and other information provided to it or publicly available and neither attempted
independently to verify  nor assumed  responsibility for verifying  any of  such
information.  Salomon Brothers did  not conduct a physical  inspection of any of
the properties or facilities  of Cray or  Silicon Graphics, nor  did it make  or
obtain  or assume  any responsibility  for making  or obtaining  any independent
evaluations or appraisals of any of such properties or facilities. With  respect
to  projections, Salomon Brothers assumed that they had been reasonably prepared
on bases reflecting the best currently available estimates and judgments of  the
managements  of Cray and Silicon Graphics as to the future financial performance
of Cray and Silicon Graphics,  respectively. Salomon Brothers expressed no  view
with respect to such projections or the assumptions on which they were based.
 
    In  conducting its  analysis and arriving  at its  opinion, Salomon Brothers
considered such financial and other factors  as it deemed appropriate under  the
circumstances  including, among  others, the  following: (i)  the historical and
current financial  position  and  results  of operations  of  Cray  and  Silicon
Graphics;  (ii) the business  prospects of Cray and  Silicon Graphics; (iii) the
historical and current market for Cray Common Stock, for Silicon Graphics Common
Stock and for  the equity  securities of  certain other  companies that  Salomon
Brothers  believes to be  comparable to Cray  or Silicon Graphics;  and (iv) the
nature and terms of certain other acquisition transactions that Salomon Brothers
believes to be relevant. Salomon Brothers also took into account its  assessment
of  general economic, market and financial  conditions as well as its experience
in connection  with similar  transactions  and securities  valuation  generally.
Salomon  Brothers also considered  the process that  resulted in the negotiation
 
                                       22
<PAGE>
of the  Transaction,  including  discussions  with  other  potential  acquirors.
Salomon  Brothers' opinion was  necessarily based on  conditions as they existed
and could  be evaluated  on the  date thereof  and Salomon  Brothers assumed  no
responsibility  to  update or  revise its  opinion  based upon  circumstances or
events occurring after such date.  Salomon Brothers' opinion did not  constitute
an  opinion or imply any  conclusion as to the  likely trading range for Silicon
Graphics  Common  Stock  following  consummation  of  the  Transaction.  Salomon
Brothers'  opinion was, in any event, limited  to the fairness, from a financial
point of view, of the consideration to be received by the holders of Cray Common
Stock in the Transaction and did not address Cray's underlying business decision
to effect the Transaction or constitute  a recommendation to any holder of  Cray
Common Stock as to whether such holder should tender shares of Cray Common Stock
in the Offer or as to how such holder should vote with respect to the Merger.
 
    In  connection with  a presentation  to Cray's  Board on  February 25, 1996,
Salomon Brothers advised Cray's Board  that, in evaluating the consideration  to
be  received in  the Transaction  by the holders  of Cray  Common Stock, Salomon
Brothers had performed a variety of financial analyses with respect to Cray  and
Silicon Graphics, all as summarized below.
 
    OVERVIEW OF CRAY AND HISTORICAL TRADING ANALYSIS.  Salomon Brothers reviewed
certain  aspects of  the financial performance  of Cray,  including, among other
things, revenue,  gross  profit,  operating income,  earnings  before  interest,
taxes,  depreciation and  amortization ("EBITDA"),  net income,  revenue growth,
operating income growth, net income  growth, gross margin, operating margin  and
net  income  margin  for fiscal  years  1984  through 1995  and  1996 management
estimates. Salomon Brothers also reviewed certain financial information of  Cray
broken down by business unit and product line for fiscal years 1993 through 1995
and  1996  management estimates.  Salomon  Brothers observed  that  Cray's gross
profit, operating profit and net income margins have declined steadily over  the
past  ten years due to, among  other things, decreasing demand, heightened price
competition and Cray's lack of  a sufficient sales and marketing  infrastructure
to  enable it to  gain quick access  to high growth  commercial markets. Salomon
Brothers also noted that 1995  was a year of  transition for Cray with  revenues
and net income (loss before restructuring charges) declining to $676 million and
($34)  million from $922 million and $56 million in 1994, respectively, and that
1996 is a year in which Cray expects to benefit from new product introductions.
 
    In addition, Salomon Brothers reviewed with Cray's Board certain information
concerning the trading prices  of Cray Common Stock  through February 16,  1996.
Salomon Brothers noted that Cray Common Stock was trading near an eighteen month
high  on February 16, 1996, but  had underperformed the overall high-performance
computer industry and the S&P Industrial Average over the prior two years.
 
    Salomon Brothers calculated the implied Transaction value per share of  Cray
Common  Stock (based on a 75% cash component equal to $30.00 per share and a 25%
stock component  equal to  $27.00 per  share (reflecting  the closing  price  of
Silicon  Graphics  Common Stock  on  February 21,  1996))  at $29.25  per share.
Salomon Brothers observed  that this value  represented a 17%  premium over  the
closing  price  of Cray  Common  Stock on  February  21, 1996.  Salomon Brothers
calculated multiples  of  the implied  Transaction  value per  share  to  Cray's
projected  earnings  per  share for  calendar  year  1996 and  to  its projected
earnings per share  adjusted for  excess cash for  calendar year  1996, and  the
multiple  of Cray's  Firm Value  (market capitalization  (based on  a $29.25 per
share price)  plus debt  less cash  and cash  equivalents) to  its revenues  for
calendar  year 1995.  The results of  the calculations were  as follows: implied
Transaction value per share to projected 1996 earnings per share of 20.8x and to
projected 1996 earnings per  share adjusted for excess  cash flow of 19.2x,  and
Firm Value to revenues of 0.87x.
 
    OVERVIEW  OF  SILICON GRAPHICS  AND  HISTORICAL TRADING  ANALYSIS.   Salomon
Brothers also reviewed certain aspects  of the financial performance of  Silicon
Graphics,  including,  among  other  things,  revenue,  gross  profit, operating
income, net income, revenue growth, operating income growth, net income  growth,
gross  margin,  operating margin  and net  income margin  for fiscal  years 1991
through 1995, and  1996, 1997  and 1998 management  estimates. Salomon  Brothers
also reviewed with the
 
                                       23
<PAGE>
Board  certain  information concerning  the trading  prices of  Silicon Graphics
Common Stock through February 16,  1996. Salomon Brothers observed that  Silicon
Graphics'  revenues and earnings  had been growing  at a rate  of 30% during the
years 1987 through 1995 due to, among other things, Silicon Graphics' leadership
position in the visual computing market  and its expanding presence in the  fast
growing  advanced  technical server  and  workstation markets.  Salomon Brothers
noted that the trading price of Silicon Graphics Common Stock had fallen  during
the  several months  immediately prior to  February 16, 1996,  but remained well
above the levels seen prior to  November 1994. Salomon Brothers also noted  that
Silicon  Graphics  Common  Stock had  significantly  underperformed  the overall
high-performance  computer  industry  and  the  S&P  Industrial  Average   since
September  1995, and  that Wall  Street analysts  believe that  Silicon Graphics
Common Stock is undervalued.
 
    ANALYSIS OF SELECTED PUBLICLY-TRADED COMPARABLE COMPANIES.  Salomon Brothers
reviewed certain  publicly  available  financial,  operating  and  stock  market
information  for Cray, Silicon Graphics and eight other publicly-traded computer
companies (Hewlett Packard, Sequent, Sun Microsystems, Stratus Computer,  Tandem
Computer,  International  Business Machines,  Digital Equipment  Corporation and
Amdahl (excluding Cray  and Silicon  Graphics, each  of which  is a  "Comparable
Company"  and  collectively  referred to  as  "Comparable  Companies")). Salomon
Brothers considered the Comparable  Companies to be  reasonably similar to  Cray
and  Silicon Graphics, respectively, but none of these companies is identical to
Cray or  Silicon Graphics.  Accordingly,  the analysis  described below  is  not
purely  mathematical. Rather  it involves  complex considerations  and judgments
concerning differences  in  historical  and projected  financial  and  operating
characteristics of Cray, Silicon Graphics and the Comparable Companies and other
factors that could affect public trading value.
 
    VALUATION  OF CRAY.  For  Cray, Silicon Graphics and  each of the Comparable
Companies, Salomon Brothers reviewed its  three year historical revenue  growth,
three  year historical earnings  before interest and  taxes ("EBIT") growth, one
year projected earnings per  share ("EPS") growth, and  five year projected  EPS
growth.  (Projected EPS and net income was based upon First Call Corporation and
Institutional Brokers Estimate Systems reports.) Salomon Brothers observed  that
the three year historical EBIT growth and one year projected EPS growth were not
meaningful  for Cray, and that Cray had underperformed relative to the median of
the Comparable  Companies  and  Silicon  Graphics in  each  of  the  three  year
historical revenue growth and five year projected EPS growth.
 
    For  Cray, Silicon  Graphics and each  of the  Comparable Companies, Salomon
Brothers reviewed its latest twelve  months ("LTM") revenues, LTM gross  margin,
LTM  EBIT margin, and LTM net income margin. Salomon Brothers observed that Cray
underperformed relative to the  median of the  Comparable Companies and  Silicon
Graphics in each such category.
 
    For  Cray, Silicon  Graphics and each  of the  Comparable Companies, Salomon
Brothers calculated, among  other things,  multiples of price  to calendar  1995
earnings, estimated calendar 1996 earnings and estimated calendar 1997 earnings,
ratio of Firm Value to LTM Revenues, and multiples of Firm Value to LTM EBIT and
LTM  EBITDA. An  analysis of  the multiples  of price  to 1995  earnings was not
meaningful for Cray as a result  of Cray's current operating losses and  yielded
multiples  ranging  from  10.9x  to  36.7x, with  a  median  of  20.6x,  for the
Comparable Companies and Silicon Graphics. An analysis of the multiples of price
to estimated 1996  earnings yielded  a multiple of  20.5x for  Cray and  yielded
multiples ranging from 9.7x to 22.6x, with a median of 16.8x, for the Comparable
Companies  and  Silicon  Graphics. An  analysis  of  the multiples  of  price to
estimated 1997  earnings  yielded a  multiple  of  13.3x for  Cray  and  yielded
multiples  ranging from 6.9x to 14.7x, with a median of 8.7x, for the Comparable
Companies and Silicon Graphics. An  analysis of the ratio  of Firm Value to  LTM
revenues yielded 72.6% for Cray and yielded ratios ranging from 23.0% to 171.9%,
with  a median of 100.5%, for the  Comparable Companies and Silicon Graphics. An
analysis of the multiples of Firm Value to LTM EBIT was not meaningful for  Cray
as  a result  of Cray's current  operating losses and  yielded multiples ranging
from 3.9x to 15.4x,  with a median  of 11.9x, for  the Comparable Companies  and
Silicon  Graphics. An  analysis of  the multiples  of Firm  Value to  LTM EBITDA
yielded a multiple of 5.5x for Cray  and yielded multiples ranging from 1.8x  to
11.0x, with a median of 6.3x for the Comparable Companies and Silicon Graphics.
 
                                       24
<PAGE>
    Salomon  Brothers derived  from these calculations  a range  of multiples of
Firm Value to LTM revenue, Firm Value to LTM EBIT, Firm Value to LTM EBITDA  and
price  to estimated 1996 net income. These  ranges were narrower than the ranges
based solely on calculations  from the public data  based on certain  subjective
and  qualitative judgments applied  by Salomon Brothers  to such calculations to
more accurately reflect  the valuation  sensitivity provided  by this  analysis.
Using  such derived  range of  multiples, Salomon  Brothers derived  a valuation
range for the  Implied Equity Value  of Cray  of $570 million  to $725  million,
which  translated into an  implied equity value  per share of  $22.00 to $28.00.
Salomon noted that the valuation multiples based on LTM EBIT were not meaningful
as a result of Cray's current operating losses.
 
    Salomon Brothers also reviewed three scenarios involving the distribution by
Cray of excess cash in  the form of a special  dividend to its shareholders.  In
the  first case ("Case  1"), Salomon Brothers  assumed Cray would  retain a cash
balance of approximately $180 million and would distribute $110 million. In  the
second case ("Case 2"), Salomon Brothers assumed Cray would retain approximately
$80  million and would  distribute $210 million.  In the third  case ("Case 3"),
Salomon Brothers  assumed Cray  would retain  approximately $80  million,  would
distribute  $210  million and  would shut  down  the Business  Systems Division.
Salomon Brothers  performed  a  series  of  calculations  for  each  such  case,
including  the calculation of  adjusted estimated 1996  net income. Applying the
range of multiples  of price  to these adjusted  estimates of  1996 net  income,
Salomon  Brothers derived valuation ranges for  the implied equity value of Cray
of $438 million to $570 million, $500  million to $616 million and $614  million
to  $774 million, and implied equity value per share of $16.90 to $22.00, $19.30
to $23.80 and $23.70 to $29.90, for Case 1, Case 2 and Case 3, respectively.
 
    VALUATION OF SILICON GRAPHICS.  Salomon Brothers did a similar analysis  for
the  purpose of valuing Silicon Graphics. For Cray, Silicon Graphics and each of
the Comparable Companies,  Salomon Brothers reviewed  its three year  historical
revenue  growth,  three  year historical  EBIT  growth, one  year  projected EPS
growth, and  five year  projected  EPS growth.  Salomon Brothers  observed  that
Silicon  Graphics  outperformed Cray  in each  such category,  outperformed each
Comparable Company  with  respect  to  three year  revenue  growth,  three  year
historical  EBIT growth and  five year projected  EPS growth, and underperformed
relative to the  median of  the Comparable Companies  with respect  to one  year
projected EPS growth.
 
    For  Silicon Graphics and each of the Comparable Companies, Salomon Brothers
reviewed its LTM revenues, LTM gross margin, LTM EBIT margin, and LTM net income
margin. Salomon Brothers  observed that  Silicon Graphics  outperformed Cray  in
each  such category,  outperformed each Comparable  Company with  respect to LTM
gross margin, LTM  EBIT margin and  LTM net income  margin and had  outperformed
relative to the median of the Comparable Companies with respect to LTM revenues.
 
    For  Silicon Graphics and each of the Comparable Companies, Salomon Brothers
calculated, among other things, multiples  of price to 1995 earnings,  estimated
1996  earnings and estimated 1997 earnings, ratio of Firm Value to LTM Revenues,
and multiples of  Firm Value  to LTM  EBIT and LTM  EBITDA. An  analysis of  the
multiples  of price  to 1995  earnings yielded a  multiple of  20.6x for Silicon
Graphics and yielded  multiples ranging from  10.9x to 36.7x,  with a median  of
20.7x,  for the Comparable Companies  and Cray. An analysis  of the multiples of
price to  estimated  1996 earnings  yielded  a  multiple of  16.8x  for  Silicon
Graphics  and yielded  multiples ranging  from 9.7x to  22.6x, with  a median of
16.9x, for the Comparable  Companies and Cray. An  analysis of the multiples  of
price  to  estimated  1997 earnings  yielded  a  multiple of  11.4x  for Silicon
Graphics and yielded  multiples ranging  from 6.9x to  14.7x, with  a median  of
8.7x,  for the Comparable Companies  and Cray. An analysis  of the ratio of Firm
Value to LTM  revenues yielded 171.9%  for Silicon Graphics  and yielded  ratios
ranging  from  23.0% to  164.0%,  with a  median  of 72.6%,  for  the Comparable
Companies and Cray.  An analysis  of the  multiples of  Firm Value  to LTM  EBIT
yielded  a multiple of 10.1x for  Silicon Graphics and yielded multiples ranging
from 3.9x to 15.4x,  with a median  of 12.5x, for  the Comparable Companies  and
Cray.
 
                                       25
<PAGE>
An  analysis of the multiples of Firm Value  to LTM EBITDA yielded a multiple of
7.9x for Silicon Graphics and yielded multiples ranging from 1.8x to 11.0x, with
a median of 5.5x for the Comparable Companies.
 
    Based  on  these  calculations   and  certain  subjective  and   qualitative
judgments,  Salomon Brothers derived a  range of multiples of  Firm Value to LTM
revenue, Firm Value to LTM EBIT, Firm Value to LTM EBITDA and price to estimated
1996 and 1997 net income. These ranges  did not directly track the ranges  based
solely  on  calculations  from  the  public  data  because  the  subjective  and
qualitative judgments  applied by  Salomon Brothers  to such  calculations  were
believed  to more accurately reflect the  valuation sensitivity provided by this
analysis. Using  such derived  range of  multiples, Salomon  Brothers derived  a
valuation  range  for the  implied equity  value of  Silicon Graphics  of $5,319
million to $6,206  million, which translated  into an implied  equity value  per
share of $30.00 to $35.00.
 
    ANALYSIS  OF  SELECTED MERGERS/ACQUISITION  TRANSACTIONS.   Salomon Brothers
also analyzed certain publicly available  financial, operating and stock  market
information  for  eleven  selected  merger or  acquisition  transactions  in the
computer hardware industry over the past five years. Salomon Brothers considered
the precedent mergers and acquisition  transactions to be reasonably similar  to
the  Transaction, but none of these  precedents is identical to the Transaction,
particularly in light of  the somewhat unique nature  of Cray. Accordingly,  the
analysis  described below is not purely mathematical. Rather it involves complex
considerations and judgments concerning differences in historical and  projected
financial  and  operating  characteristics  of Cray,  Silicon  Graphics  and the
companies involved  in the  precedent merger  and acquisition  transactions  and
other  factors that  could affect  the private  market valuation.  For each such
transaction, Salomon Brothers calculated the  multiples of, among other  things,
Firm  Value to LTM  revenue, Firm Value to  LTM EBITDA, Firm  Value to LTM EBIT,
offer price to LTM EPS,  and offer price to  forward twelve month EPS  estimates
("FWD  EPS"). An analysis of the multiples  of Firm Value to LTM revenue yielded
multiples ranging from .5x to  2.0x, with a median of  1.1x. An analysis of  the
multiples  of Firm Value  to LTM EBITDA  yielded multiples ranging  from 4.4x to
23.0x, with a median of 8.5x. An analysis of the multiples of Firm Value to  LTM
EBIT  yielded multiples ranging from  5.0x to 37.4x, with  a median of 13.4x. An
analysis of the multiples  of Offer Price to  LTM EPS yielded multiples  ranging
from  11.9x to 36.3x,  with a median of  20.4x. An analysis  of the multiples of
Offer Price to FWD  EPS yielded multiples  ranging from 11.8x  to 34.0x, with  a
median of 18.9x.
 
    Salomon  Brothers derived  from these calculations  a range  of multiples of
Firm Value to LTM revenue, Firm Value to EBITDA, Firm Value to EBIT, offer price
to estimated 1996  net income  and offer price  to adjusted  estimated 1996  net
income  under Case  2. This range  was narrower  than the range  based solely on
calculations from the public  data based on  certain subjective and  qualitative
judgments  applied by Salomon  Brothers to such  calculations to more accurately
reflect the valuation sensitivity provided by this analysis. Using such  derived
range  of multiples, Salomon Brothers derived  a valuation range for the implied
equity value of Cray of $648.0 million to $777.0 million, which translated  into
an  implied equity value per  share of $25.00 to  $30.00. Salomon Brothers noted
that the valuation multiples based on LTM  EBIT were not meaningful as a  result
of Cray's current operating losses.
 
    EPS  GROWTH RATE  ANALYSIS.  Salomon  Brothers performed a  five year growth
rate analysis of Cray on  a stand alone basis,  using Cray's then current  stock
price of $25, a required return on equity of 14% and price to earnings multiples
in  the range  of 10x  to 14x.  Based upon  these assumptions,  Salomon Brothers
discussed with the Cray Board its view that in order to maintain the stock price
of Cray Common Stock at a level  reflecting the current price plus the  required
return  on equity  in five years,  EPS growth  during that period  would need to
exceed 20%. Salomon  Brothers also  noted that  Cray's five  year projected  EPS
growth was estimated at 10%.
 
    PRO  FORMA COMBINATION ANALYSIS.  Salomon  Brothers performed an analysis of
the historical ratio  of the market  price of  Cray Common Stock  to the  market
price  of Silicon Graphics Common  Stock during the period  from January 1, 1994
through February 20, 1996. Salomon Brothers noted
 
                                       26
<PAGE>
that the ratio ranged from a low of 0.44  to a high of 1.33, with an average  of
0.77.  The ratio as of  February 20, 1996 was  0.91. Salomon Brothers also noted
that the 1.00 exchange ratio for the Merger (assuming a fully subscribed  Offer)
represents  a 58% premium to  the average ratio calculated  in this analysis for
the period from January 1, 1995 through February 20, 1996.
 
    Salomon Brothers also analyzed the contribution of each of Cray and  Silicon
Graphics  to the pro forma calendar  1996 income statement based on management's
projections.  The  projections  took  into  account,  among  other  things,  the
amortization of goodwill associated with the Transaction and an interest expense
adjustment  associated with the assumed new debt. Salomon Brothers utilized this
analysis to assess whether  the Transaction was anticipated  to be accretive  or
dilutive  to Silicon  Graphics' post-Transaction 1996  EPS. Based  on the $29.25
implied Transaction value,  Salomon Brothers noted  that the Transaction  should
result in a 1.2% accretion to Silicon Graphics' post-Transaction 1996 EPS.
 
    The  foregoing summary does not purport to  be a complete description of the
analyses performed  by Salomon  Brothers or  of its  presentations to  the  Cray
Board.  The preparation of financial analyses and fairness opinions is a complex
process and  is  not necessarily  susceptible  to partial  analysis  or  summary
description.  Salomon Brothers believes  that its analyses  (and the summary set
forth above) must be considered as a whole, and that selecting portions of  such
analyses  and of the factors considered by Salomon Brothers, without considering
all of  such  analyses and  factors,  could create  an  incomplete view  of  the
processes underlying the analyses conducted by Salomon Brothers and its opinion.
Salomon  Brothers  made  no attempt  to  assign specific  weights  to particular
analyses.  Any  estimates  contained  in  Salomon  Brothers'  analyses  are  not
necessarily indicative of actual values, which may be significantly more or less
favorable  than as set  forth therein. Estimates  of values of  companies do not
purport to be appraisals or necessarily to reflect the prices at which companies
may  actually  be  sold.  Because  such  estimates  are  inherently  subject  to
uncertainty, Salomon Brothers does not assume responsibility for their accuracy.
 
    Salomon  Brothers is  an internationally recognized  investment banking firm
engaged, among other things, in the valuation of businesses and their securities
in connection with mergers and acquisitions, restructurings, leveraged  buyouts,
negotiated  underwritings,  competitive  biddings,  secondary  distributions  of
listed and unlisted  securities, private placements  and valuations for  estate,
corporate  and  other  purposes. In  addition,  in  the ordinary  course  of its
business, Salomon Brothers may actively trade the debt and equity securities  of
both  Cray and  Silicon Graphics  for its  own account  and for  the accounts of
customers and, accordingly, may  at any time  hold a long  or short position  in
such securities.
 
    Pursuant  to  the  Engagement Letter,  Cray  will pay  Salomon  Brothers the
following fees: (a) $75,000, paid upon Cray's execution of the Engagement Letter
(which has been  paid); plus  (b) an additional  fee of  $425,000, which  became
payable  upon execution of the  Merger Agreement (which has  not yet been paid);
plus (c) an additional fee contingent  upon the consummation of the  Transaction
and  payable at the closing thereof equal to $2,500,000. Cray has also agreed to
reimburse Salomon Brothers  for its  reasonable travel  and other  out-of-pocket
expenses  incurred in connection  with its engagement  (including the reasonable
fees and disbursements of its counsel) and to indemnify Salomon Brothers against
certain liabilities and expenses relating to  or arising out of its  engagement,
including certain liabilities under the Federal securities laws.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    The  receipt of Silicon Graphics Common Stock pursuant to the Merger will be
a taxable transaction for federal income tax purposes and may also be a  taxable
transaction under applicable state, local or foreign tax laws. A stockholder who
receives  Silicon  Graphics  Common  Stock in  exchange  for  Cray  Common Stock
pursuant to the Merger will recognize gain  or loss at the time of the  exchange
in  an amount equal to  the difference between (i) the  fair market value of the
Silicon Graphics Common
 
                                       27
<PAGE>
Stock received by the stockholder and  (ii) such stockholders' tax basis in  the
Cray  Common Stock  surrendered. The fair  market value of  the Silicon Graphics
Common Stock likely will equal the  trading value per share of Silicon  Graphics
Common Stock on the date on which the Merger occurs.
 
    Gain  or loss will  be calculated separately  for each block  of Cray Common
Stock (i.e., Cray Common Stock purchased at the same time and price) surrendered
by a stockholder. Such  gain or loss will  be capital gain or  loss if the  Cray
Common  Stock was a capital  asset in the hands of  the stockholder, and will be
long-term capital gain or loss if, at the time of the exchange, the Cray  Common
Stock  were held by the  stockholder for more than  one year. Under present law,
long-term capital  gains are  generally taxable  at a  maximum rate  of 28%  for
individuals and 35% for corporations.
 
    THE  FOREGOING  DISCUSSION  MAY  NOT  BE  APPLICABLE  TO  CERTAIN  TYPES  OF
STOCKHOLDERS, INCLUDING STOCKHOLDERS WHO ACQUIRED CRAY COMMON STOCK PURSUANT  TO
THE EXERCISE OF EMPLOYEE STOCK OPTIONS OR OTHERWISE AS COMPENSATION, INDIVIDUALS
WHO   ARE  NOT  CITIZENS  OR  RESIDENTS   OF  THE  UNITED  STATES,  AND  FOREIGN
CORPORATIONS.
 
    THE FEDERAL INCOME TAX  DISCUSSION SET FORTH ABOVE  IS INCLUDED FOR  GENERAL
INFORMATION  ONLY  AND IS  BASED  UPON PRESENT  LAW.  STOCKHOLDERS ARE  URGED TO
CONSULT THEIR TAX ADVISORS WITH RESPECT TO THE SPECIFIC TAX CONSEQUENCES OF  THE
MERGER  TO THEM, INCLUDING THE APPLICATION AND EFFECT OF THE ALTERNATIVE MINIMUM
TAX, AND STATE, LOCAL AND FOREIGN TAX LAWS.
 
ACCOUNTING TREATMENT
 
    The Merger  will  be  accounted  for  under  the  purchase  method.  Several
merger-related   accounting  factors  will  affect  Silicon  Graphics'  reported
financial results in fiscal 1996 and 1997. These matters are discussed in detail
in Silicon Graphics' Form 10-Q  for the quarter ended  March 31, 1996, which  is
incorporated by reference in this Proxy Statement/Prospectus.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
    In  considering the  recommendation of  the Cray  Board with  respect to the
Merger, stockholders of Cray should be aware that certain officers and directors
of Cray had  interests in the  Merger, including those  referred to below,  that
presented  them with potential conflicts of  interests. The Cray Board was aware
of these potential conflicts  and considered them along  with the other  matters
described  in  "-- Cray's  Reasons for  the Merger;  Recommendation of  the Cray
Board."
 
    Pursuant to the terms of the Merger Agreement, executive officers Robert  H.
Ewald,  Laurence L. Betterley,  Irene M. Qualters and  Michael R. Dungworth, are
entitled to a lump sum  cash payment equal to two  times his or her annual  base
compensation  if they are terminated without  cause or resign with "good reason"
within twelve months of the consummation of the Offer. Prior to the execution of
the Merger Agreement, each such executive officer would have been entitled to  a
lump  sum cash payment equal  to two times his  or her annual total compensation
for the prior calendar year and  twenty-four months of executive officer  health
insurance if the executive officer was terminated without cause or resigned with
good reason within fifteen months of a "change of control."
 
    Pursuant to certain "change of control" provisions contained in the Employee
Stock  Option Plan that were triggered by the consummation of the Offer, options
held by Cray employees and granted under such plan before the date of the Merger
Agreement, automatically vested and the restrictions on restricted stock held by
Cray employees  and  granted under  such  plan before  the  date of  the  Merger
Agreement  automatically lapsed. There  are currently an  aggregate of 4,857,145
shares subject to outstanding options under the Employee Stock Option Plan,  all
of which vested as a result of consummation of the Offer. Based upon the closing
price  of Silicon Graphics Common Stock on May 8, 1996, and assuming exercise of
outstanding in-the-money options to purchase  Cray Common Stock issued  pursuant
to  the Employee Stock  Option Plan, the  aggregate dollar value  of the Silicon
Graphics Common Stock to  be received by officers  of Cray and their  affiliates
upon  exercise of such options is approximately $9,779,000, including $8,332,000
associated  with  such  options  which  accelerated  to  full  vesting  at   the
consummation of the Offer.
 
                                       28
<PAGE>
    Cray  has offered to the  holders of options with  an exercise price greater
than $29.125 per share ("Out-of-the-Money Options") the opportunity to  exchange
Out-of-the-Money  Options for unvested options with an exercise price of $29.125
per share ("Exchange Options") at the rate of three Out-of-the-Money Option  for
each  Exchange Option.  The Exchange  Options will  vest at  the rate  of 2% per
month. In  addition,  the  terms  of  the  Exchange  Options  will,  subject  to
stockholder  approval of  the Plan  Amendment, differ  in certain  respects from
those of the Out-of-the-Money  Options. See "Proposal to  Amend and Restate  the
Cray Research, Inc. 1989 Employee Benefit Stock Plan -- General Description" for
a discussion of these differences. As of May 8, 1996, officers of Cray and their
affiliates held 72,107 Out-of-the-Money Options.
 
    Pursuant  to  the Merger  Agreement, the  surviving corporation  and Silicon
Graphics agreed to honor  the employment agreement with  J. Phillip Samper  (the
Chairman  and Chief Executive Officer of Cray  until April 3, 1996), which has a
term beginning on May 17, 1995 and extending until December 31, 1999. Mr. Samper
resigned with  good reason  on April  3, 1996,  and therefore,  pursuant to  his
employment  agreement became entitled  to (i) the continued  payment of his then
current base salary for the lesser of two years or the remainder of the term  of
the  employment agreement, (ii) the  current payment of any  amounts owed to him
under Cray's Performance Incentive  Plan, an award ranging  from 80% to 120%  of
his annual base salary, including any part of the yet unpaid guaranteed bonus of
$480,000  for the first year  of employment, and (iii)  the payment of an amount
equal to two years of his then current salary minus his vested balance in Cray's
Retirement Savings Plus Plan, paid  in equal monthly installments. In  addition,
Cray  will pay to Mr. Samper an amount equal to the sum of (a) any loss incurred
by the Samper family on the sale of their Minnesota residence and (b) relocation
costs equal to the original cost of moving Mr. Samper's principal residence from
Maryland to Minnesota, adjusted for inflation.
 
    Pursuant to a deferred compensation agreement entered into between Cray  and
Mr.  Samper, Cray agreed to pay Mr. Samper $431,000 per annum over an eight year
period in equal monthly  installments in lieu of  the payments described in  (i)
through  (iii) above. In the event of Mr. Samper's death prior to receipt of the
foregoing amounts, Cray will pay the remaining unpaid amounts to his spouse, or,
if he is not married on the date of death, to his estate.
 
    The Merger Agreement provides that Cray will, and after the Effective  Time,
the  surviving  corporation and  Silicon Graphics  will,  to the  fullest extent
permitted  under  applicable   law  or   under  the   relevant  Certificate   of
Incorporation or Bylaws, indemnify and hold harmless each director or officer of
Cray or any of its subsidiaries against any costs or expenses, judgments, fines,
losses,  claims, damages, liability and amounts paid in settlement in connection
with any claim,  action, suit,  proceeding or  investigation arising  out of  or
pertaining  to any action or omission by  such director or officer, by virtue of
their holding the office of  director or officer, occurring  at or prior to  the
Effective Time for a period of six years after the Effective Time.
 
    In  addition, the Certificate of  Incorporation of the surviving corporation
will  contain  the  indemnification  provisions  currently  set  forth  in   the
Certificate  of Incorporation  and Bylaws of  Cray, which shall  not be amended,
repealed or otherwise modified for a period of six years from the Effective Time
in any manner that would adversely  affect the rights thereunder of  individuals
who  at  the Effective  Time were  directors  or officers  of Cray,  unless such
modification is required by law.
 
REGULATORY MATTERS
 
    Under the HSR Act and the  rules promulgated thereunder, the Merger may  not
be  consummated unless notification  has been given  and certain information has
been furnished  to the  Antitrust Division  and the  FTC and  specified  waiting
period  requirements have been satisfied. The  required waiting period under the
HSR Act with respect to the Merger expired  at 11:59 p.m. on March 26, 1996.  At
any  time before or after the Effective  Time, the FTC or the Antitrust Division
could take  such  action under  the  antitrust laws  as  it deems  necessary  or
desirable  in the  public interest,  including seeking  to enjoin  the Merger or
seeking the  divestiture of  Cray by  Silicon  Graphics, in  whole or  in  part,
 
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<PAGE>
or  the divestiture  or compulsory  licensing of  substantial assets  of Silicon
Graphics, Cray or  their respective  subsidiaries. State  attorneys general  and
private  parties  may  also  bring  legal actions  under  the  federal  or state
antitrust laws under certain circumstances.
 
LITIGATION
 
    On March 1, 1996, a putative class action was filed in the Court of Chancery
in the State of Delaware on behalf  of the stockholders of Cray alleging  causes
of  action arising out of  the Offer and the  proposed Merger, SHADELINE V. CRAY
RESEARCH, INC., ET AL., Civ. Action No. 14868. The defendants in this action are
Cray, its directors, Silicon  Graphics and Merger Sub.  The action alleges  that
Cray  and  the  Cray Board  breached  their  fiduciary duties  and  that Silicon
Graphics aided  and abetted  the  breach of  fiduciary duties  and  specifically
alleges  that  the  Cray  Board  breached its  fiduciary  duties  by  failing to
undertake an adequate evaluation  of Cray as  a potential acquisition  candidate
and  to take adequate steps to enhance Cray's value as an acquisition candidate.
The action  seeks INTER  ALIA to  enjoin  the defendants  from taking  steps  to
accomplish  the Merger under its present terms. Silicon Graphics, Merger Sub and
Cray believe that the putative class action suit is without merit and intend  to
defend it vigorously.
 
ABSENCE OF APPRAISAL RIGHTS
 
    Neither the holders of Cray Common Stock nor the holders of Silicon Graphics
Common Stock have appraisal rights in connection with the Merger.
 
                  THE MERGER AGREEMENT AND RELATED AGREEMENTS
 
    The  following description  of the Merger  Agreement does not  purport to be
complete, omits provisions that have been  rendered inapplicable as a result  of
the  consummation of the Offer and is  qualified in its entirety by reference to
the Merger  Agreement  a  copy of  which  is  attached hereto  as  Annex  A  and
incorporated  by reference  herein. Stockholders of  Cray are urged  to read the
Merger Agreement in its entirety for a more complete description of the Merger.
 
THE MERGER
 
    The Merger  Agreement provides  that,  upon the  terms  and subject  to  the
conditions  thereof, and in accordance with Delaware Law, at the Effective Time,
Merger Sub shall be merged  with and into Cray. As  a result of the Merger,  the
separate  corporate existence of Merger Sub will cease and Cray will continue as
the surviving corporation and will become  a wholly owned subsidiary of  Silicon
Graphics.  Upon consummation of the Merger, each share of Cray Common Stock held
in the treasury of Cray and each Ineligible Share shall be cancelled and retired
without payment of any consideration thereof and cease to exist.
 
CONVERSION OF SHARES
 
    As a result of the Merger, each share of Cray Common Stock will be converted
at a one-to-one ratio into Silicon Graphics Common Stock. Subject to  adjustment
to  remove fractional  shares, each remaining  outstanding share  of Cray Common
Stock (other  than Ineligible  Shares)  shall be  converted  into the  right  to
receive one fully paid and non-assessable share of Silicon Graphics Common Stock
(the "Exchange Ratio").
 
    As  promptly as practicable after the  Effective Time, Silicon Graphics will
cause to be sent to each stockholder of record of Cray as of the Effective  Time
(other  than  Ineligible Shares)  transmittal  materials for  use  in exchanging
certificates of Cray Common  Stock for certificates  of Silicon Graphics  Common
Stock.  The transmittal materials will contain information and instructions with
respect to the surrender of Cray  Common Stock certificates in exchange for  new
certificates  representing Silicon Graphics Common Stock and cash in payment for
any fractional shares resulting  from the exchange.  CERTIFICATES SHOULD NOT  BE
SURRENDERED  UNTIL THE  LETTER OF TRANSMITTAL  IS RECEIVED.  Pending delivery to
Silicon Graphics of Cray Common Stock certificates, any dividends on the Silicon
Graphics Common Stock to be  issued as a result of  the Merger that are  payable
prior to the
 
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<PAGE>
delivery  of such certificates will be  held by Silicon Graphics. Such dividends
will be paid, without interest, to the persons entitled thereto upon delivery of
such Cray Common Stock certificates to Silicon Graphics.
 
    Fractional shares of Silicon Graphics Common Stock will not be issued in the
Merger. Instead, each stockholder of Cray  who would otherwise be entitled to  a
fractional  share will receive cash in lieu  thereof, calculated on the basis of
the average  closing price  of Silicon  Graphics Common  Stock for  the 30  most
recent  trading days prior to  the Effective Time, as  quoted in THE WALL STREET
JOURNAL or other reliable financial newspaper or publication.
 
TREATMENT OF CRAY COMMON STOCK OPTIONS, STOCK PURCHASE PLAN, AND CONVERTIBLE
DEBENTURES
 
    STOCK OPTION PLANS.   Under the  Merger Agreement, all  options to  purchase
Cray  Common Stock  granted under the  Cray Research, Inc.  1985 Incentive Stock
Option and Nonstatutory Option Plan (the "1985 Plan"), the Employee Stock Option
Plan and the Cray Research, Inc. 1989 Non-Employee Directors' Stock Option  Plan
(the "Directors' Plan" and, together with the Employee Stock Option Plan and the
1985  Plan,  the "Stock  Option  Plans") or  pursuant  to any  other arrangement
adopted by the Board to provide  options to directors, officers or employees  of
Cray  (in  any such  case, an  "Option")  then outstanding  shall be  assumed by
Silicon Graphics  as set  forth below.  The above  plans, along  with all  other
employee  related plans,  are herein collectively  referred to  as the "Employee
Plans."
 
    At the Effective Time, Cray's  obligations with respect to each  outstanding
Option, whether vested or unvested, shall, by virtue of the Merger Agreement and
without  any  further action  of Cray,  Silicon  Graphics or  the holder  of any
Option, be  assumed by  Silicon  Graphics. Each  Option  so assumed  by  Silicon
Graphics  under the Merger Agreement shall continue  to have, and be subject to,
the same terms and conditions set forth in the applicable Stock Option Plan  and
the  applicable stock  option agreement  as in  effect immediately  prior to the
Effective Time, except that (i) such Option will be exercisable for that  number
of shares of Silicon Graphics Common Stock equal to the number of shares of Cray
Common  Stock that were  purchasable under such Option  immediately prior to the
Effective Time, subject to adjustment to reflect the effect of any stock  split,
reverse split, stock dividend, reorganization or recapitalization, rounded up to
the  nearest whole number of  shares of Silicon Graphics  Common Stock, and (ii)
the per share  exercise price for  the shares of  Silicon Graphics Common  Stock
issuable  upon exercise  of such  assumed Option will  be equal  to the exercise
price per  share of  Cray Common  Stock  at which  such Option  was  exercisable
immediately  prior to the  Effective Time, subject to  adjustment to reflect the
effect of  any stock  split, reverse  split, stock  dividend, reorganization  or
recapitalization,  and rounding the  resulting exercise price  up to the nearest
whole cent.  After the  Effective  Time, if  not  otherwise elected  by  Silicon
Graphics,  all references to Cray  in the Stock Option  Plans and the applicable
stock option agreements  shall be  deemed to  refer to  Silicon Graphics,  which
shall  have assumed the  Stock Option Plans. Stockholder  approval of the Merger
Agreement shall constitute approval of Silicon Graphics' assumption of the Stock
Option Plans and the issuance of new awards thereunder.
 
    It is the intention of Silicon Graphics and Cray that the Options assumed by
Silicon Graphics qualify following the Effective Time as incentive stock options
as defined in Section  422 of the Code  to the extent (and  only to the  extent)
such Options qualified as incentive stock options prior to the Effective Time.
 
    CRAY  EMPLOYEE  STOCK PURCHASE  PLAN.   Subject to  the consummation  of the
Merger, on the Final Purchase Date, Cray  will apply any funds then credited  to
each  Purchase Plan participant's payroll withholding account to the purchase of
whole shares of Cray Common Stock. The cost to each participant in the  Purchase
Plan  for the shares of Cray Common Stock purchased shall be the lower of 85% of
the closing sale price of Cray Common Stock on the NYSE on (i) the first day  of
the  then current Purchase Period (as defined  in the Purchase Plan) or (ii) the
last trading day on or prior to  the Final Purchase Date. Shares of Cray  Common
Stock purchased on the Final Purchase Date will be converted to Silicon Graphics
Common  Stock in  the same  manner as  described above  under "--  Conversion of
Shares." Employees  of  Cray as  of  the Effective  Time  will be  permitted  to
participate in
 
                                       31
<PAGE>
Silicon   Graphics'  Employee  Stock  Purchase  Plan  commencing  on  the  first
enrollment date following  the Effective  Time, subject to  compliance with  the
eligibility requirements of Silicon Graphics' Employee Stock Purchase Plan (with
Cray  employees receiving credit, for purposes  of such eligibility, for service
with Cray).
 
    CONVERTIBLE  DEBENTURES.    Under  the  Merger  Agreement,  the  Convertible
Debentures  shall, pursuant  to the  terms of  the Indenture,  become thereafter
convertible only into that number of shares of Silicon Graphics Common Stock and
cash, if any,  that the  holder of any  such Convertible  Debentures would  have
received  if such holder  had converted such  Convertible Debentures immediately
prior to  the Effective  Time as  provided in  Section 15.06  of the  Indenture.
Silicon  Graphics  shall  execute  and  deliver  a  supplemental  indenture (the
"Supplemental Indenture"), which shall evidence Silicon Graphics' assumption  of
the  Convertible  Debentures and  provide that  the  holder of  each Convertible
Debenture shall have the right thereafter to convert such Convertible  Debenture
as described above, in each case in accordance with the terms of the Indenture.
 
BUSINESS OF CRAY PENDING THE MERGER
 
    Pursuant  to  the Merger  Agreement, Cray  has  covenanted and  agreed that,
subject to certain  exceptions, between  the date  of the  Merger Agreement  and
continuing  until the earlier of the termination  of the Merger Agreement or the
Effective Time, unless Silicon Graphics  shall otherwise agree in writing,  Cray
shall  conduct its business and shall cause  the business of its subsidiaries to
be conducted only in, and  Cray and its subsidiaries  shall not take any  action
except  in the ordinary course of business  and in a manner consistent with past
practice;  and  Cray  shall  use  reasonable  commercial  efforts  to   preserve
substantially  intact the business organization of Cray and its subsidiaries, to
keep available the services of  the present officers, employees and  consultants
of Cray and its subsidiaries, to take all reasonable action necessary to prevent
the  loss, cancellation,  abandonment, forfeiture  or expiration  of all current
patents, registered  and material  unregistered  trademarks and  service  marks,
registered   and  material   unregistered  copyrights,   trade  names   and  any
applications  therefor  owned  by  Cray  (the  "Company  Intellectual   Property
Rights"),  all material third-party patents,  trademarks or copyrights which are
incorporated in, are, or form  a part of any  Company product (the "Third  Party
Intellectual  Property Rights"), and material contracts  of Cray and to preserve
the present relationships of Cray and its subsidiaries with customers, suppliers
and other persons  with which Cray  or any of  its subsidiaries has  significant
business  relations. The Merger Agreement  provides that, except as contemplated
therein, neither Cray nor any of its subsidiaries shall, between the date of the
Merger Agreement and  continuing until  the earlier  of the  termination of  the
Merger Agreement or the Effective Time, directly or indirectly do, or propose to
do, any of the following, without the prior written consent of Silicon Graphics:
(a)  amend or otherwise  change its Certificate of  Incorporation or Bylaws; (b)
issue, sell,  pledge, dispose  of, encumber,  or authorize  the issuance,  sale,
pledge, disposition, or encumbrance of any shares of capital stock of any class,
or  any options, warrants, convertible securities or other rights of any kind to
acquire any shares of capital stock, or any other ownership interest (including,
without limitation, any phantom  interest) of Cray, any  of its subsidiaries  or
affiliates  (except for  the issuance  of shares  of Cray  Common Stock issuable
pursuant to the exercise of Options under the Stock Option Plans or pursuant  to
rights to purchase such shares under the Purchase Plan, which Options or rights,
as  the case may be, are outstanding on the date of the Merger Agreement or with
respect to the Convertible Debentures); (c) sell, pledge, dispose of or encumber
any assets of Cray or any of its subsidiaries (except for (i) sales of assets in
the ordinary course of business and in a manner consistent with past practice or
which individually  and in  the  aggregate do  not  exceed $1,000,000  and  (ii)
dispositions  of obsolete or  worthless assets); (d) amend  or change the period
(or permit any acceleration, amendment  or change) of exercisability of  Options
or  restricted  stock granted  under the  Stock Option  Plans or  authorize cash
payments in exchange for any such Options or restricted stock; (e) (i)  declare,
set  aside, make  or pay  any dividend or  other distribution  (whether in cash,
stock or property or any combination thereof)  in respect of any of its  capital
stock,  except that  a wholly  owned subsidiary  of Cray  may declare  and pay a
dividend to its  parent, (ii) split,  combine or reclassify  any of its  capital
stock  or issue or authorize or propose  the issuance of any other securities in
 
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<PAGE>
respect of, in lieu  of or in  substitution for shares of  its capital stock  or
(iii) amend the terms of, repurchase, redeem or otherwise acquire, or permit any
subsidiary  to repurchase, redeem or otherwise acquire, any of its securities or
any securities of its subsidiaries, or propose  to do any of the foregoing;  (f)
sell,  transfer,  license,  sublicense  or  otherwise  dispose  of  any  Company
Intellectual Property Rights  (other than  in the ordinary  course of  business,
consistent  with past  practice, in connection  with systems  sales and software
developer programs), or amend or modify any existing agreements with respect  to
any  Company Intellectual Property  Rights or Third  Party Intellectual Property
Rights; (g) (i) acquire  (by merger, consolidation, or  acquisition of stock  or
assets)  any corporation, partnership or other business organization or division
thereof; (ii)  incur any  indebtedness  for borrowed  money  or issue  any  debt
securities  or assume,  guarantee or  endorse or  otherwise as  an accommodation
become responsible for,  the obligations  of any person,  or make  any loans  or
advances,  except  to  employees in  the  ordinary course  consistent  with past
practice; (iii) enter into or amend any contract or agreement other than in  the
ordinary course of business; (iv) authorize any capital expenditures or purchase
of  fixed  assets which  are, in  the  aggregate, in  excess of  Cray's budgeted
capital expenditures for 1996; PROVIDED, HOWEVER, that no more than one half  of
such  amount shall  be made  or firmly  committed prior  to June  30, 1996, and,
PROVIDED, FURTHER  that Cray  will give  Silicon Graphics  prior notice  of  the
making or the firm commitment of more than $5 million of capital expenditures in
any  calendar quarter; (v) terminate  any material contract or  amend any of its
material terms (other than amendments  to existing credit arrangements  designed
to  remedy  defaults thereunder);  or  (vi) enter  into  or amend  any contract,
agreement, commitment or arrangement to effect any of the matters prohibited  by
(i)  through (v); (h) increase the compensation  payable or to become payable to
its officers or  employees, or  grant any severance  or termination  pay to,  or
enter  into any employment or severance  agreement with any director, officer or
other employee of  Cray or  any of its  subsidiaries except  in accordance  with
Cray's  existing severance policy  or establish, adopt, enter  into or amend any
Employee Plan (other  than amendments  required in  order to  effect the  Merger
Agreement);  (i) take  any action,  other than  as required  by GAAP,  to change
accounting policies or  procedures or  cash maintenance  policies or  procedures
(including,  without limitation, procedures with respect to revenue recognition,
capitalization of development costs, payments of accounts payable and collection
of accounts receivable); (j)  make any material  tax election inconsistent  with
past  practices or  settle or compromise  any material federal,  state, local or
foreign tax liability or agree to an  extension of a statute of limitations  for
any  assessment  of federal  income tax  or material  state corporate  income or
franchise tax, except to the extent the  amount of any such settlement has  been
reserved  for on Cray's most  recent report filed with  the Commission; (k) pay,
discharge, settle, or satisfy any  lawsuits, claims, liabilities or  obligations
(absolute, accrued, asserted or unasserted, contingent or otherwise), other than
the  payment, discharge or  satisfaction in the ordinary  course of business and
consistent with past practice  of liabilities reflected  or reserved against  in
the  financial statements of Cray or incurred in the ordinary course of business
and consistent with past practice;  (l) except as may  be required by law,  take
any  action  to terminate  or  amend any  Employee  Plan (other  than amendments
required in order to  effect the Merger Agreement);  (m) permit any increase  in
the  number of  employees of  Cray employed by  Cray on  the date  of the Merger
Agreement other than pursuant to  an employee plan to be  agreed to by Cray  and
Silicon  Graphics  as  promptly as  practicable  after  the date  of  the Merger
Agreement, acting reasonably and in good faith; or (n) take, or agree in writing
or otherwise to take, any of the  actions described in sections (a) through  (m)
above,  or any action which would make  any of the representations or warranties
of Cray contained in  the Merger Agreement untrue  or incorrect or prevent  Cray
from  performing or  cause Cray  not to perform  its covenants  under the Merger
Agreement or result  in any of  the conditions to  the Merger set  forth in  the
Merger Agreement not being satisfied.
 
SOLICITATION OF ALTERNATIVE TRANSACTIONS
 
    Pursuant  to  the  Merger Agreement,  Cray  has  agreed that  it  shall not,
directly or indirectly, through any officer, director, employee,  representative
or  agent of Cray or any of its subsidiaries, solicit or encourage (including by
way of  furnishing information)  the initiation  of any  inquiries or  proposals
regarding  any merger, take-over bid, sale of substantial assets, sale of shares
of capital stock
 
                                       33
<PAGE>
(including without limitation by way of  a tender or exchange offer) or  similar
transactions  involving Cray or  any subsidiaries of Cray  (any of the foregoing
inquiries or proposals being referred  to herein as an "Acquisition  Proposal");
PROVIDED,  HOWEVER, that nothing contained in the Merger Agreement shall prevent
the Cray  Board  from  referring  any  third party  that  contacts  Cray  on  an
unsolicited  basis  after  the  date  of  the  Merger  Agreement  concerning  an
Alternative Transaction  (as defined  below) to  Section 5.02(a)  of the  Merger
Agreement  (provided  that Silicon  Graphics  is concurrently  notified  of such
contact and referral).  The parties have  agreed that nothing  contained in  the
Merger  Agreement shall  prevent the Cray  Board, after receiving  an opinion of
outside counsel to the effect that the Cray Board is required to do so in  order
to  discharge  properly  its fiduciary  duties,  from  considering, negotiating,
approving and recommending to the stockholders of Cray an unsolicited bona  fide
written  Acquisition  Proposal which  the Cray  Board  determines in  good faith
(after  consultation  with  its  financial  advisors)  (i)  would  result  in  a
transaction   more  favorable  to  Cray's   stockholders  than  the  transaction
contemplated by the Merger  Agreement and (ii) is  made by a person  financially
capable of consummating such Acquisition Proposal (any such Acquisition Proposal
being  referred  to herein  as a  "Superior  Proposal"). Cray  shall immediately
notify Silicon Graphics after receipt of any Acquisition Proposal or any request
for nonpublic  information  relating to  Cray  or  any of  its  subsidiaries  in
connection  with an Acquisition Proposal or  for access to the properties, books
or records of Cray or  any subsidiary by any person  or entity that informs  the
Cray  Board that it is considering making, or has made, an Acquisition Proposal.
Such notice to Silicon Graphics  shall be made orally  and in writing and  shall
indicate  in reasonable  detail the  identity of the  offeror and  the terms and
conditions of such proposal,  inquiry or contact. If  the Cray Board receives  a
request  for material  nonpublic information  by a party  who makes  a bona fide
Acquisition Proposal  and  the Cray  Board  determines that  such  proposal,  if
consummated  pursuant to its  terms, is a  Superior Proposal, then,  and only in
such case, Cray  may, subject to  the execution of  a confidentiality  agreement
substantially  similar to that then in effect between Cray and Silicon Graphics,
provide such  party  with  access  to information  regarding  Cray.  The  Merger
Agreement  also  provides that  Cray  shall immediately  cease  and cause  to be
terminated any existing discussions or negotiations with any parties (other than
Silicon Graphics and Merger Sub) conducted heretofore with respect to any of the
foregoing. Cray agrees not to release  any third party from any  confidentiality
or  standstill agreement to  which Cray is  a party. Cray  shall ensure that the
officers,  directors  and  employees  of  Cray  and  its  subsidiaries  and  any
investment  banker or other advisor or representative retained by Cray are aware
of the restrictions described  in this paragraph; and  shall be responsible  for
any  breach  of this  paragraph by  such  bankers, advisors  and representatives
(PROVIDED, HOWEVER, that Cray shall not be liable for any consequential  damages
with respect to such breaches).
 
    For  purposes of the Merger Agreement, "Alternative Transaction" means (i) a
transaction pursuant  to which  any  person (or  group  of persons)  other  than
Silicon  Graphics or its affiliates (a "Third  Party") acquires more than 20% of
the outstanding shares of Cray Common Stock, whether from Cray or pursuant to  a
tender  offer or exchange  offer or otherwise,  (ii) a merger  or other business
combination involving Cray pursuant to which any Third Party acquires more  than
20%  of the outstanding equity  securities of Cray or  the entity surviving such
merger or business combination or (iii) any other transaction pursuant to  which
any  Third  Party acquires  control of  assets (including  for this  purpose the
outstanding equity securities of subsidiaries of Cray, and the entity  surviving
any  merger  or business  combination including  any  of them)  of Cray  and its
subsidiaries having a  fair market  value equal  to more  than 20%  of the  fair
market  value of all the assets of Cray  and its subsidiaries, taken as a whole,
immediately  prior  to  such  transaction;  PROVIDED,  HOWEVER,  that  the  term
Alternative  Transaction shall  not include any  acquisition of  securities by a
broker-dealer in connection with a bona fide public offering of such securities.
 
BUSINESS OF SILICON GRAPHICS PENDING THE MERGER
 
    The Merger Agreement provides  that during the period  from the date of  the
Merger  Agreement and  continuing until  the earlier  of the  termination of the
Merger Agreement  or the  Effective Time,  Silicon Graphics  has covenanted  and
agreed   that,   unless  Cray   shall  otherwise   agree  in   writing,  Silicon
 
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<PAGE>
Graphics  shall  conduct  its  business,   and  cause  the  businesses  of   its
subsidiaries  to be conducted, in the ordinary course of business and consistent
with past  practice,  other  than  actions taken  by  Silicon  Graphics  or  its
subsidiaries  in  contemplation  of  the  Merger,  and  shall  not  directly  or
indirectly do, or propose to do, any of the following without the prior  written
consent  of Cray: (a) amend or otherwise change Silicon Graphics' Certificate of
Incorporation (other than with respect to immaterial changes thereto), or  amend
the terms of the Silicon Graphics Common Stock; (b) acquire or agree to acquire,
by  merging or  consolidating with,  by purchasing  an equity  interest in  or a
portion of  the  assets  of,  or  by any  other  manner,  any  business  or  any
corporation, partnership, association or other business organization or division
thereof,  or  otherwise acquire  or agree  to  acquire any  assets of  any other
person, which, in each case, would materially delay or prevent the  consummation
of  the transactions contemplated  by the Merger  Agreement; (c) sell, transfer,
license, sublicense or otherwise dispose of any material assets; or (d) take, or
agree in writing  or otherwise to  take, any  of the actions  described in  this
paragraph  or  any  action  which  would  make  any  of  the  representations or
warranties of  Silicon Graphics  contained  in the  Merger Agreement  untrue  or
incorrect  or prevent Silicon Graphics from performing or cause Silicon Graphics
not to perform its covenants thereunder or would result in any of the conditions
to the merger to be satisfied by Silicon Graphics not being satisfied.
 
CORPORATE STRUCTURE AND RELATED MATTERS AFTER THE MERGER
 
    At the Effective Time, Merger Sub will  be merged with and into Cray,  which
will  be  the  surviving corporation  and  will  thereby become  a  wholly owned
subsidiary of Silicon Graphics. Each share of Merger Sub common stock issued and
outstanding immediately prior to the Effective  Time will be converted into  and
exchanged  for one validly issued, fully  paid and nonassessable share of common
stock of the surviving corporation.
 
    Unless otherwise determined by Silicon Graphics prior to the Effective Time,
at the Effective  Time the  Certificate of Incorporation  of Merger  Sub, as  in
effect  immediately  prior to  the Effective  Time, will  be the  Certificate of
Incorporation of the surviving corporation, until thereafter amended. The Bylaws
of Merger Sub, as in effect immediately prior to the Effective Time, will be the
Bylaws of the surviving corporation, until thereafter amended.
 
CERTAIN COVENANTS
 
    Pursuant to  the Merger  Agreement, the  surviving corporation  and  Silicon
Graphics shall honor the terms and provisions in the Employment Agreement, dated
May  17, 1995,  between Cray's chief  executive officer, J.  Phillip Samper, and
Cray. See "The Merger -- Interests of Certain Persons in the Merger." The Merger
Agreement also provides that the surviving corporation shall, subject to certain
exceptions set forth in the Merger Agreement, offer severance benefits to Cray's
employees generally consistent with those given in Cray's most recent  reduction
in  force and,  in general,  in accordance  with the  1995 Amended  and Restated
Severance Pay Plan for Cray Research, Inc.
 
    The Merger Agreement further provides that the Certificate of  Incorporation
of  the  surviving  corporation shall  contain  the provisions  with  respect to
indemnification set  forth in  the Certificate  of Incorporation  and Bylaws  of
Cray,  which provisions shall not be amended, repealed or otherwise modified for
a period of six years from the Effective Time in any manner that would adversely
affect the  rights thereunder  of individuals  who at  the Effective  Time  were
directors or officers of Cray, unless such modification is required by law.
 
    The  Merger Agreement also  provides that Cray shall,  to the fullest extent
permitted under applicable law or  under Cray's Certificate of Incorporation  or
Bylaws  and regardless  of whether the  Merger becomes  effective, indemnify and
hold harmless,  and after  the  Effective Time,  the surviving  corporation  and
Silicon  Graphics shall, to the fullest extent permitted under applicable law or
under the surviving  corporation's and Silicon  Graphics', as the  case may  be,
Certificate  of  Incorporation  or  Bylaws, indemnify  and  hold  harmless, each
director and  officer of  Cray or  any of  its subsidiaries  (collectively,  the
"Indemnified  Parties")  against  any costs  or  expenses  (including attorneys'
fees), judgments, fines, losses, claims,  damages, liabilities and amounts  paid
in  settlement  in  connection  with  any  claim,  action,  suit,  proceeding or
investigation, whether civil, criminal, administrative or
 
                                       35
<PAGE>
investigative, arising out of  or pertaining to any  action or omission by  such
director or officer by virtue of their holding the office of director or officer
occurring  at or prior to the Effective Time (including, without limitation, the
transactions contemplated by  the Merger Agreement)  for a period  of six  years
after  the  Effective  Time. In  the  event  of any  such  claim,  action, suit,
proceeding or  investigation  (whether arising  before  or after  the  Effective
Time),  (i) any counsel retained by the Indemnified Parties for any period after
the Effective Time shall be reasonably satisfactory to the surviving corporation
and Silicon  Graphics and  (ii) neither  the surviving  corporation nor  Silicon
Graphics shall be liable for any settlement effected without its written consent
(which consent shall not be unreasonably withheld).
 
    Pursuant  to the Merger Agreement, Silicon Graphics shall use its reasonable
best efforts to cause the shares of  Silicon Graphics Common Stock to be  issued
in  the  Merger,  upon  exercise  of the  Options  and  upon  conversion  of the
Convertible Debentures, to be approved for listing on the NYSE.
 
REPRESENTATIONS AND WARRANTIES
 
    The  Merger  Agreement  contains   various  customary  representations   and
warranties  of the parties  thereto including representations by  Cray as to the
absence of certain changes or events concerning Cray's business, capitalization,
compliance with  law, material  contracts, litigation,  employee benefit  plans,
labor  matters,  Commission  filings,  title  to  property,  taxes, intellectual
property and environmental  matters. In  addition to the  foregoing, the  Merger
Agreement also contains the representations of Cray described below.
 
    Cray  has represented that the Cray Board  has taken all necessary action to
amend the Common Stock Rights Agreement  among Cray and Norwest Bank  Minnesota,
N.A., as Rights Agent, dated May 15, 1989 (the "Cray Rights Agreement"), so that
(A)  none of the execution or delivery of  the Merger Agreement or the making of
the Offer will cause (i) the rights issued pursuant to the Cray Rights Agreement
(the "Cray Rights") to become exercisable under the Cray Rights Agreement,  (ii)
Silicon  Graphics  or Merger  Sub or  any of  their affiliates  to be  deemed an
"Acquiring Person" (as defined in the Cray Rights Agreement) or (iii) the "Share
Acquisition Date" (as defined  in the Cray Rights  Agreement) to occur upon  any
such event, (B) none of the acceptance for payment or payment for shares of Cray
Common  Stock by  Merger Sub pursuant  to the  Offer or the  consummation of the
Merger will  cause (i)  the Cray  Rights to  become exercisable  under the  Cray
Rights  Agreement  or  (ii) Silicon  Graphics  or  Merger Sub  or  any  of their
affiliates to be deemed an Acquiring Person or (iii) the Share Acquisition  Date
to  occur upon any such event, and (C)  the "Expiration Date" (as defined in the
Cray Rights  Agreement) shall  occur  no later  than  immediately prior  to  the
purchase  of shares pursuant  to the Offer.  Cray has also  represented that the
"Distribution Date" (as defined in the Cray Rights Agreement) has not occurred.
 
    Cray has represented that the Cray  Board has taken all necessary action  to
amend  the 1989 Cray Research, Inc.  Executives Severance Compensation Plan (the
"Executive Severance Plan"), the Cray Research, Inc. Key Management/Professional
Severance Compensation  Plan  and  the  Cray  Research,  Inc.  General  Employee
Severance  Compensation Plan (collectively, the  "Severance Plans") so that none
of the execution, delivery  or performance of  the Merger Agreement,  including,
without limitation, consummation of the Offer and the Merger, shall constitute a
"Change of Control" for the purposes of such Severance Plans.
 
CONDITIONS TO THE MERGER
 
    Under  the Merger  Agreement, the  respective obligations  of each  party to
effect the Merger are subject to the  satisfaction at or prior to the  Effective
Time of the following conditions: (a) the Registration Statement shall have been
declared  effective by  the Commission under  the Securities Act;  no stop order
suspending the  effectiveness  of the  Registration  Statement shall  have  been
issued  by the  Commission and  no proceedings for  that purpose  and no similar
proceeding in  respect of  the  Proxy Statement  shall  have been  initiated  or
threatened by the Commission; (b) the Merger Agreement and the Merger shall have
been approved and adopted by the requisite vote of the stockholders of Cray; (c)
the  waiting period applicable to  the consummation of the  Merger under the HSR
Act shall
 
                                       36
<PAGE>
have expired or been terminated; (d) no temporary restraining order, preliminary
or permanent  injunction  or  other  order issued  by  any  court  of  competent
jurisdiction  or  other  similar  binding  legal  restraint  or  prohibition (an
"Injunction") preventing the consummation of the Merger shall be in effect,  nor
shall any proceeding brought by any administrative agency or commission or other
governmental  authority or instrumentality, domestic  or foreign, seeking any of
the foregoing  be pending;  and there  shall not  be any  action taken,  or  any
statute,  rule,  regulation  or  order  enacted,  entered,  enforced  or  deemed
applicable to the Merger,  which makes the consummation  of the Merger  illegal;
(e)  the Silicon Graphics Common Stock to be issued in the Merger, upon exercise
of the Options and upon conversion of the Convertible Debentures shall have been
approved for  listing, subject  to notice  of  issuance, on  the NYSE;  and  (f)
Silicon Graphics shall have made, or caused to be made, the Offer and shall have
purchased,  or caused to be  purchased, shares of Cray  Common Stock pursuant to
the Offer.
 
    In addition to the foregoing, the obligations of Silicon Graphics and Merger
Sub to effect the Merger are also  subject to the following conditions: (a)  the
representations  and warranties of Cray contained  in the Merger Agreement shall
be true and correct in all respects on and as of the Effective Time, except  for
(i) changes contemplated by the Merger Agreement, (ii) those representations and
warranties  which  address matters  only as  of a  particular date  (which shall
remain true and correct as of such date) and (iii) where the failure to be  true
and  correct would  not have a  material adverse  effect on Cray,  with the same
force and effect as if made on and as of the Effective Time; (b) Cray shall have
performed or complied in all material respects with all agreements and covenants
required by the Merger Agreement  to be performed or complied  with by it on  or
prior  to the  Effective Time;  (c) all  material consents,  waivers, approvals,
authorizations or orders required to be obtained, and all filings required to be
made, by  Cray for  the  authorization, execution  and  delivery of  the  Merger
Agreement  and the consummation  by it of  the transactions contemplated thereby
shall have  been obtained  and  made by  Cray; (d)  there  shall not  have  been
instituted, pending or threatened any action or proceeding (or any investigation
or  other inquiry  that might  result in  such an  action or  proceeding) by any
governmental  authority  or  administrative   agency  before  any   governmental
authority,  administrative agency or court  of competent jurisdiction, nor shall
there be in effect any judgment, decree or order of any governmental  authority,
administrative  agency  or  court  of competent  jurisdiction,  in  either case,
seeking to  prohibit or  limit  Silicon Graphics  from exercising  all  material
rights  and privileges pertaining to its  ownership of the surviving corporation
or the ownership or operation by Silicon Graphics or any of its subsidiaries  of
all  or a material portion of the business  or assets of Silicon Graphics or any
of its  subsidiaries,  or seeking  to  compel Silicon  Graphics  or any  of  its
subsidiaries  to dispose of or hold separate  all or any material portion of the
business or assets of Silicon Graphics or  any of its subsidiaries, as a  result
of  the Merger  or the  transactions contemplated  by the  Merger Agreement; (e)
since the  date  of the  Merger  Agreement, there  shall  have been  no  change,
occurrence  or circumstance in the business,  results of operations or financial
condition of Cray or any subsidiary of Cray having or reasonably likely to  have
a  Material Adverse Effect (as defined in the Merger Agreement); and (f) Silicon
Graphics shall have received from each officer and director who is identified as
an "affiliate" of Cray an affiliate agreement, and each such affiliate agreement
shall be in full force and effect.
 
    Finally the obligation of Cray to effect  the Merger is also subject to  the
following conditions: (a) the representations and warranties of Silicon Graphics
and  Merger Sub contained in  the Merger Agreement shall  be true and correct in
all  respects  on  and  as  of  the  Effective  Time,  except  for  (i)  changes
contemplated  by the Merger Agreement, (ii) those representations and warranties
which address matters only as of a particular date (which shall remain true  and
correct  as of such date)  and (iii) failures to be  true and correct that would
not have a material adverse effect on Cray, with the same force and effect as if
made on and as of the Effective Time; (b) Silicon Graphics and Merger Sub  shall
have  performed or  complied in  all material  respects with  all agreements and
covenants required by the Merger Agreement  to be performed or complied with  by
them  on or  prior to  the Effective Time;  (c) all  material consents, waivers,
approvals, authorizations or  orders required  to be obtained,  and all  filings
required  to be made, by Silicon Graphics  and Merger Sub for the authorization,
execution and delivery of the Merger  Agreement and the consummation by them  of
the transactions contemplated thereby
 
                                       37
<PAGE>
shall  have been obtained and  made by Silicon Graphics  and Merger Sub; and (d)
since the  date  of the  Merger  Agreement, there  shall  have been  no  change,
occurrence  or circumstance in the business,  results of operations or financial
condition of Silicon Graphics  or any subsidiary of  Silicon Graphics having  or
reasonably likely to have a Material Adverse Effect.
 
TERMINATION; AMENDMENT
 
    The Merger Agreement provides that it may be terminated at any time prior to
the  Effective  Time, notwithstanding  approval thereof  by the  stockholders of
Cray: (a) by mutual written consent  duly authorized by the boards of  directors
of  Silicon Graphics and Cray; or (b) by  either Silicon Graphics or Cray if the
Merger shall not have been consummated by September 30, 1996 (PROVIDED that  the
right  to terminate  the Merger  Agreement shall not  be available  to any party
whose failure to fulfill any obligation under the Merger Agreement has been  the
cause  of or resulted  in the failure of  the Merger to occur  on or before such
date); or  (c) by  either  Silicon Graphics  or Cray  if  a court  of  competent
jurisdiction  or governmental, regulatory or administrative agency or commission
shall have issued a  non-appealable final order, decree  or ruling or taken  any
other  action,  in  each  case having  the  effect  of  permanently restraining,
enjoining or otherwise prohibiting  the Merger; or (d)  by Silicon Graphics,  if
the  Offer shall not have been consummated prior to June 30, 1996 (PROVIDED that
Silicon Graphics is not then in material breach of the Merger Agreement); or (e)
by Silicon Graphics, if (i) the Cray Board shall withdraw, modify or change  its
recommendation  of the  Merger Agreement,  the Offer or  the Merger  in a manner
adverse to Silicon Graphics or  shall have resolved to do  so; or (ii) the  Cray
Board  shall  have taken  a "neutral"  position with  respect to  an Alternative
Transaction (as defined in the Merger Agreement); or (iii) any person or "group"
(other than Silicon Graphics  or an affiliate of  Silicon Graphics) becomes  the
owner  of 20% or more of the outstanding  shares of Cray Common Stock; or (f) by
Silicon Graphics  or  Cray,  upon  a breach  of  any  representation,  warranty,
covenant  or agreement on the  part of Cray or  Silicon Graphics and Merger Sub,
respectively, set forth in the Merger  Agreement or in certain events where  the
representations  or  warranties  of Cray  or  Silicon Graphics  and  Merger Sub,
respectively, shall have become untrue, (a "Terminating Breach"), PROVIDED that,
if such Terminating Breach is  curable prior to the  expiration of 30 days  from
its  occurrence  (but in  no event  later  than September  30, 1996)  by Silicon
Graphics or Cray, as  the case may  be, through the  exercise of its  reasonable
best  efforts and for so long  as Silicon Graphics or Cray,  as the case may be,
continues to exercise  such reasonable  best efforts, neither  Cray nor  Silicon
Graphics,  respectively, may terminate the Merger Agreement under this provision
until the expiration of such period without such Terminating Breach having  been
cured; or (g) by Cray or Silicon Graphics, if the Cray Board shall have resolved
to accept, or accepted, a Superior Proposal.
 
    In  the  event  of  the  termination of  the  Merger  Agreement,  the Merger
Agreement provides that  it shall forthwith  become void and  there shall be  no
liability thereunder on the part of any party thereto, or any of its affiliates,
directors,  officers or stockholders  except under the  provisions of the Merger
Agreement related to fees and expenses  described below and under certain  other
provisions of the Merger Agreement which survive termination.
 
    The  Merger Agreement may  be amended by  an agreement in  writing among the
parties thereto at  any time  prior to  the Effective  Time; provided,  however,
that, after approval of the Merger by the stockholders of Cray, no amendment may
be  made which  by law requires  further approval of  such stockholders, without
such further approval.
 
FEES AND EXPENSES
 
    Except as described  herein, all  fees and expenses  incurred in  connection
with the Merger Agreement and the transactions contemplated thereby will be paid
by the party incurring such expenses, whether or not the Merger is consummated.
 
    Cray  has agreed to pay  Silicon Graphics a fee  of $25,000,000 (the "Fee"),
plus  actual,  documented  and  reasonable  out-of-pocket  expenses  of  Silicon
Graphics, not in excess of $2,500,000, relating to the transactions contemplated
by  the Merger Agreement  (including, but not  limited to, fees  and expenses of
Silicon Graphics' counsel), if  the Merger Agreement  is terminated because  (i)
the Cray Board has
 
                                       38
<PAGE>
withdrawn or changed its recommendation of the Merger Agreement or the Merger in
a  manner adverse to Silicon Graphics or taken a "neutral" position with respect
to an  Alternative  Transaction or  any  person  or group  (other  than  Silicon
Graphics  or an affiliate of Silicon Graphics)  becomes the owner of 20% or more
of the outstanding shares of Cray Common Stock, or if the Cray Board shall  have
resolved  to accept, or  accepted, a Superior Proposal,  (ii) Cray has willfully
committed a Terminating Breach and has failed to cure such breach in the  manner
set  forth above, (iii) the Offer has not  been consummated by June 30, 1996 and
an Alternative Transaction has been publicly announced and not withdrawn or (iv)
an Alternative Transaction  is consummated  on or  prior to  December 31,  1996,
PROVIDED,  HOWEVER, that no fee  shall be payable if  Silicon Graphics or Merger
Sub in each case is in intentional material breach of its obligations under  the
Merger Agreement.
 
CONFIDENTIALITY AGREEMENT
 
    Silicon  Graphics and Cray each has agreed to keep confidential, pursuant to
the confidentiality  agreement dated  December  15, 1995  (the  "Confidentiality
Agreement"),  information  provided  to  the other  party  with  respect  to the
business, properties and personnel of the party furnishing such information. The
Confidentiality Agreement contains terms restricting  the disclosure and use  of
confidential  information exchanged  between the  two parties  in evaluating the
Merger and otherwise.
 
AGREEMENTS OF CRAY AFFILIATES
 
    Rule 145 promulgated under the  Securities Act regulates the disposition  of
securities  of  "affiliates" of  Cray in  connection with  the Merger.  Cray has
delivered to Silicon Graphics a letter (the "Affiliate Letter") identifying  all
persons  who are or  may be deemed  to be, at  the time of  the Special Meeting,
"affiliates" of Cray  for purposes of  Rule 145 under  the Securities Act.  Such
Affiliate  Letter may be further  updated prior to the  Effective Time. Cray has
also agreed to use its best efforts to cause each person (an "Affiliate") who is
identified as  an  Affiliate in  the  Affiliate  Letter to  deliver  to  Silicon
Graphics,  prior  to  the Effective  Time,  a written  agreement  (an "Affiliate
Agreement"). Under  such Affiliate  Agreements, every  Affiliate will  represent
that  he or she  has been advised that  the Affiliate may  not sell, transfer or
otherwise dispose of Silicon  Graphics Common Stock issued  to the Affiliate  in
the  Merger  unless  such  sale,  transfer or  other  disposition  (i)  has been
registered under  the  Securities Act,  (ii)  is  made in  compliance  with  the
requirements  of Rule 145 under  the Securities Act, or  (iii) in the opinion of
counsel reasonably  acceptable to  Silicon Graphics,  is otherwise  exempt  from
registration under the Securities Act.
 
    In  addition, all  executive officers and  directors of  Cray have confirmed
that they intend to vote their respective  shares of Cray Common Stock in  favor
of the Merger.
 
                                       39
<PAGE>
                           SILICON GRAPHICS AND CRAY
 
               PRO FORMA COMBINED CONDENSED FINANCIAL INFORMATION
                                  (UNAUDITED)
 
    The  following unaudited  pro forma combined  condensed financial statements
give effect to the Merger under the purchase method of accounting. The pro forma
combined condensed balance sheet assumes the  Merger took place on December  31,
1995  and combines  Silicon Graphics'  unaudited condensed  consolidated balance
sheet with Cray's historical condensed consolidated balance sheet at that  date.
The pro forma combined condensed statements of operations assume that the Merger
took  place as  of the beginning  of each  of the periods  presented and combine
Silicon Graphics' historical condensed consolidated statement of operations  for
the  year  ended  June  30,  1995  and  Silicon  Graphics'  unaudited  condensed
consolidated statement of operations for the six months ended December 31,  1995
with  the unaudited condensed  consolidated statement of  operations of Cray for
the twelve-month  period  ended  June  30,  1995  and  the  unaudited  condensed
consolidated  statement of operations of Cray  for the six months ended December
31, 1995, respectively.
 
    The charge of $87 million resulting from purchased research and  development
costs  has  been reflected  in stockholders'  equity in  the pro  forma combined
condensed balance sheet at December 31, 1995. This same charge has been excluded
from the pro  forma combined  condensed statements  of operations  for the  year
ended June 30, 1995 and the six months ended December 31, 1995.
 
    The pro forma information is presented for illustrative purposes only and is
not necessarily indicative of operating results or financial position that would
have  occurred if the Merger had been consummated as of the dates indicated, nor
is it necessarily indicative of future operating results or financial  position.
In  particular,  the actual  adjustments  to the  valuation  of Cray  assets and
liabilities in connection with the  acquisition may vary significantly from  the
estimates reflected in the pro forma financial information.
 
    These  pro forma combined  condensed financial statements  should be read in
conjunction with the historical consolidated financial statements and the  notes
thereto of Silicon Graphics and Cray which are incorporated by reference in this
Proxy Statement/Prospectus.
 
                                       40
<PAGE>
      SILICON GRAPHICS AND CRAY PRO FORMA COMBINED CONDENSED BALANCE SHEET
                            AS OF DECEMBER 31, 1995
                                 (IN THOUSANDS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                     HISTORICAL    HISTORICAL        PRO FORMA         PRO FORMA
                                                         SGI          CRAY          ADJUSTMENTS        COMBINED
                                                    -------------  -----------  -------------------  -------------
<S>                                                 <C>            <C>          <C>                  <C>
ASSETS:
Cash and cash equivalents.........................  $     258,380  $   104,425  $    (103,807)(a)    $     258,998
Short-term marketable investments.................        153,438      --            (153,438)(a)         --
Accounts receivable, net..........................        655,884      156,039          --                 811,923
Inventories.......................................        342,823      177,359         62,000(c)           582,182
Prepaid expenses and other current assets.........         86,755       60,082        173,000(c)           319,837
                                                    -------------  -----------     ----------        -------------
    Total current assets..........................      1,497,280      497,905         22,245            1,972,940
Other marketable investments......................        282,755      150,000        (90,755)(a)          342,000
Property, plant and equipment, net................        301,113      200,875       (131,000)(c)          370,988
Purchased intangible assets.......................       --            --              76,000(c)            76,000
Other assets......................................        184,339      129,274        (37,000)(c)          276,613
                                                    -------------  -----------     ----------        -------------
                                                    $   2,265,487  $   978,054  $    (205,000)       $   3,038,541
                                                    -------------  -----------     ----------        -------------
                                                    -------------  -----------     ----------        -------------
 
LIABILITIES AND STOCKHOLDERS' EQUITY:
Accounts and notes payable........................  $     162,745  $    42,924  $     238,000(a)     $     443,669
Other current liabilities.........................        381,883      229,248         86,000 (c)(d        697,131
                                                    -------------  -----------     ----------        -------------
    Total current liabilities.....................        544,628      272,172        324,000            1,140,800
Long-term debt and other..........................        277,575      103,454        (18,000)(c)          363,029
Stockholders' equity..............................      1,443,284      602,428       (511,000)(b)(c)     1,534,712
                                                    -------------  -----------     ----------        -------------
                                                    $   2,265,487  $   978,054  $    (205,000)       $   3,038,541
                                                    -------------  -----------     ----------        -------------
                                                    -------------  -----------     ----------        -------------
</TABLE>
 
    The accompanying notes are an integral part of these pro forma financial
                                  statements.
 
                                       41
<PAGE>
SILICON GRAPHICS AND CRAY PRO FORMA COMBINED CONDENSED STATEMENTS OF OPERATIONS
                        FOR THE YEAR ENDED JUNE 30, 1995
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                HISTORICAL     HISTORICAL   PRO FORMA ADJUSTMENTS     PRO FORMA
                                                    SGI           CRAY               (m)              COMBINED
                                               -------------  ------------  ----------------------  -------------
<S>                                            <C>            <C>           <C>                     <C>
NET REVENUES.................................  $   2,228,268  $    727,723  $         --            $   2,955,991
 
COSTS AND EXPENSES:
Cost of revenues.............................      1,032,059       440,715         71,000 (e)(g)(i      1,543,774
Research and development.....................        247,678       131,262            -- (g)              378,940
Selling, general and administrative..........        619,259       171,521          3,000 (g)(i           793,780
Restructuring/merger related costs...........         22,000       150,109            --                  172,109
                                               -------------  ------------    -----------           -------------
    Total costs and expenses.................      1,920,996       893,607         74,000               2,888,603
                                               -------------  ------------    -----------           -------------
Operating income (loss)......................        307,272      (165,884)       (74,000)                 67,388
Interest and other income (expense), net.....          9,447         5,526        (31,000)(k)             (16,027)
                                               -------------  ------------    -----------           -------------
Income (loss) before taxes...................        316,719      (160,358)      (105,000)                 51,361
Provision (benefit) for income taxes.........         91,863         1,301        (39,900)(l)              53,264
                                               -------------  ------------    -----------           -------------
Net income (loss)............................        224,856      (161,659)       (65,100)                 (1,903)
Preferred stock dividend requirement.........             54       --                 --                       54
                                               -------------  ------------    -----------           -------------
Net income (loss) available to common
 stockholders................................  $     224,802  $   (161,659) $     (65,100)          $      (1,957)
                                               -------------  ------------    -----------           -------------
                                               -------------  ------------    -----------           -------------
Net income (loss) per share..................  $        1.28  $      (6.33)                         $       (0.01)
                                               -------------  ------------                          -------------
                                               -------------  ------------                          -------------
Shares used to compute per share data........        175,435        25,539                                162,800
                                               -------------  ------------                          -------------
                                               -------------  ------------                          -------------
</TABLE>
 
    The accompanying notes are an integral part of these pro forma financial
                                  statements.
 
                                       42
<PAGE>
SILICON GRAPHICS AND CRAY PRO FORMA COMBINED CONDENSED STATEMENTS OF OPERATIONS
                   FOR THE SIX MONTHS ENDED DECEMBER 31, 1995
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                      HISTORICAL    HISTORICAL       PRO FORMA        PRO FORMA
                                                          SGI          CRAY       ADJUSTMENTS (m)     COMBINED
                                                     -------------  -----------  -----------------  -------------
<S>                                                  <C>            <C>          <C>                <C>
NET REVENUES.......................................  $   1,267,012  $   405,447  $      --          $   1,672,459
 
COSTS AND EXPENSES:
Cost of revenues...................................        603,967      255,696      38,000 (f)(h)(j       897,663
Research and development...........................        153,540       58,158          --(h)            211,698
Selling, general and administrative................        365,340       85,469       2,000 (h)(j         452,809
Restructuring costs................................          1,275       45,857         --                 47,132
                                                     -------------  -----------    --------         -------------
    Total costs and expenses.......................      1,124,122      445,180      40,000             1,609,302
                                                     -------------  -----------    --------         -------------
Operating income (loss)............................        142,890      (39,733)    (40,000)               63,157
Interest and other income (expense), net...........         13,040       (1,003)    (16,000)(k)            (3,963)
                                                     -------------  -----------    --------         -------------
Income (loss) before taxes.........................        155,930      (40,736)    (56,000)               59,194
Provision (benefit) for income taxes...............         45,220       (1,571)    (21,280)(l)            22,369
                                                     -------------  -----------    --------         -------------
Net income (loss)..................................        110,710      (39,165)    (34,720)               36,825
Preferred stock dividend requirement...............       --            --              --               --
                                                     -------------  -----------    --------         -------------
Net income (loss) available to common
 stockholders......................................  $     110,710  $   (39,165) $  (34,720)        $      36,825
                                                     -------------  -----------    --------         -------------
                                                     -------------  -----------    --------         -------------
Net income (loss) per share........................  $        0.62  $     (1.55)                    $        0.20
                                                     -------------  -----------                     -------------
                                                     -------------  -----------                     -------------
Shares used to compute per share data..............        178,268       25,281                           184,700
                                                     -------------  -----------                     -------------
                                                     -------------  -----------                     -------------
</TABLE>
 
    The accompanying notes are an integral part of these pro forma financial
                                  statements.
 
                                       43
<PAGE>
                           SILICON GRAPHICS AND CRAY
           NOTES TO PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
                                  (UNAUDITED)
 
    (a)  Represents borrowings,  the liquidation  of marketable  investments and
cash used to finance the acquisition  of 19,218,735 shares of Cray Common  Stock
pursuant to the Offer.
 
    (b)  Represents issuance  of one share  of Silicon Graphics  Common Stock in
exchange for each  remaining outstanding  share of Cray  Common Stock  at a  per
share  value of $26.15 (average of  Silicon Graphics Common Stock closing prices
for the five trading days immediately  preceding and following the February  26,
1996 announcement of the merger) plus the value of Cray stock options assumed by
Silicon Graphics.
 
    (c) Estimated valuation adjustments of Cray assets and liabilities resulting
from   the  preliminary  allocation  of   the  purchase  price,  elimination  of
stockholders' equity and the estimated $87  million charge taken at the time  of
acquisition for purchased research and development costs. The aggregate purchase
price  (including  acquisition  costs)  is estimated  to  be  approximately $764
million in cash, common  stock and the  value of Cray  stock options assumed  by
Silicon Graphics.
 
    (d)  Accrued expenses associated with  preliminary cost estimates, including
severance costs, termination of leases and other reserves.
 
    (e) Recognition of additional cost of sales assuming a $75 million  purchase
price  adjustment to record inventory at  fair value, amortized over nine months
assuming acquisition had taken place on July 1, 1994.
 
    (f) Recognition of additional cost of sales assuming a $60 million  purchase
price  adjustment to record inventory at  fair value, amortized over nine months
assuming acquisition had taken place on July 1, 1995.
 
    (g)  Reduction  of  depreciation  and  amortization  related  to   valuation
adjustments  of  property, plant  and equipment  and  leased systems  and spares
assuming the acquisition had taken place on July 1, 1994.
 
    (h)  Reduction  of  depreciation  and  amortization  related  to   valuation
adjustments  of  property, plant  and equipment  and  leased systems  and spares
assuming the acquisition had taken place on July 1, 1995.
 
    (i) Amortization of purchased intangible  assets (customer list, Cray  trade
name,  purchased  technology and  workforce in  place) assuming  acquisition had
taken place on  July 1,  1994. Amortization  of purchased  intangible assets  is
based on lives ranging from 4-15 years.
 
    (j)   Amortization of purchased intangible assets (customer list, Cray trade
name, purchased  technology and  workforce in  place) assuming  acquisition  had
taken  place on  July 1,  1995. Amortization  of purchased  intangible assets is
based on lives ranging from 4-15 years.
 
    (k) Adjustment to interest income associated with purchase consideration.
 
    (l) Income tax effects of pro forma adjustments computed using the  combined
federal and state statutory rate of 38%.
 
    (m)  The  statement of  operations presentation  excludes  the effect  of an
estimated $87 million charge to operations taken at the time of acquisition  for
purchased research and development costs related to acquired technology that has
not reached technological feasibility and that has no alternative future use.
 
                                       44
<PAGE>
                       COMPARISON OF STOCKHOLDERS' RIGHTS
 
    In  the event that  the Merger is  consummated, former holders  of shares of
Cray Common Stock  will, at  the Effective  Time, receive  in exchange  therefor
shares of Silicon Graphics Common Stock.
 
    The following is a summary of the material differences between the rights of
holders  of Silicon  Graphics Common  Stock and  the rights  of holders  of Cray
Common Stock  at the  date  hereof. As  each of  Silicon  Graphics and  Cray  is
organized under the DGCL, these differences arise from the various provisions of
Silicon  Graphics' Restated Certificate of  Incorporation (the "Silicon Graphics
Restated  Certificate"),  Silicon  Graphics'   Bylaws  (the  "Silicon   Graphics
Bylaws"),  Cray's Certificate of Incorporation  (the "Cray Certificate"), Cray's
Bylaws (the "Cray Bylaws") and the Silicon Graphics Rights Agreement (as defined
below) and the Cray Rights Agreement.
 
CUMULATIVE VOTING
 
    The Silicon Graphics  Restated Certificate and  the Silicon Graphics  Bylaws
provide  for cumulative voting  in director elections.  The Cray Certificate and
Cray Bylaws do not provide for cumulative voting in director elections.
 
CLASSIFICATION OF BOARD OF DIRECTORS
 
    The Silicon Graphics  Restated Certificate and  the Silicon Graphics  Bylaws
provide  for a  classified board of  directors consisting of  three classes. The
Cray Certificate and Cray  Bylaws do not provide  for the classification of  the
Cray Board.
 
AMENDMENT TO GOVERNING DOCUMENTS
 
    The DGCL requires a vote of the corporation's board of directors followed by
the  affirmative  vote of  a majority  of  the outstanding  stock of  each class
entitled to vote for any amendment to the certificate of incorporation, unless a
greater level of approval is required  by the certificate of incorporation.  The
Silicon  Graphics Restated Certificate and the Cray Certificate do not require a
greater level of approval for an amendment thereto. If an amendment would  alter
the  powers, preferences or  special rights of  a particular class  or series of
stock so as to  affect them adversely,  the class or series  shall be given  the
power  to  vote  as a  class  notwithstanding  the absence  of  any specifically
enumerated power in the certificate of incorporation. The DGCL also states  that
the power to adopt, amend or repeal the by-laws of a corporation shall be in the
stockholders  entitled to vote, provided that the corporation in its certificate
of incorporation may confer such power on the board of directors in addition  to
the stockholders. The Silicon Graphics Restated Certificate expressly authorizes
each  of the board of  directors and the stockholders  to adopt, amend or repeal
the Silicon Graphics Bylaws. The Cray Certificate expressly authorizes the  Cray
Board to adopt, amend or repeal the Cray Bylaws.
 
RIGHTS PLAN
 
    SILICON  GRAPHICS  RIGHTS PLAN.   Effective  February  1, 1991,  the Silicon
Graphics Board declared  a dividend  of one  preferred share  purchase right  (a
"Silicon  Graphics Right") for each outstanding share of Silicon Graphics Common
Stock, to stockholders of record  as of the close of  business on March 1,  1991
and  for each share of Silicon  Graphics Common Stock issued thereafter pursuant
to a Preferred Shares Rights Agreement (as amended, the "Silicon Graphics Rights
Agreement"). One Silicon Graphics Right will be issued for each share of Silicon
Graphics Common  Stock  issued  in  connection with  the  Merger.  Each  Silicon
Graphics  Right entitles the registered holder to purchase from Silicon Graphics
one-thousandth of  a  share  of  Series B  Participating  Preferred  Stock  (the
"Silicon  Graphics  Series B  Preferred"),  at a  price  of $200.00,  subject to
adjustment under certain circumstances set forth in the Silicon Graphics  Rights
Agreement.  Upon the occurrence  of certain events  generally associated with an
unsolicited attempt to take over  Silicon Graphics, the Silicon Graphics  Rights
(except  for Silicon Graphics Rights held by  an Acquiring Person (as defined in
the Silicon Graphics Rights Agreement))  will become exercisable and will  cease
to  trade with the  Silicon Graphics Common Stock.  Upon the acquisition without
the consent of  the Silicon Graphics  Board of  15% or more  of the  outstanding
shares  of Silicon Graphics  Common Stock or  announcement of a  tender offer or
exchange offer for shares in excess of 15% or more of the outstanding shares  of
Silicon
 
                                       45
<PAGE>
Graphics  Common Stock  (the "Flip-In  Threshold"), each  Silicon Graphics Right
(except for  Silicon  Graphics Rights  held  by  an Acquiring  Person)  will  be
converted  into a right  to purchase at  the then-current exercise  price of the
Silicon Graphics Right that  number of shares of  Silicon Graphics Common  Stock
having  a market value of  two times the exercise  price of the Silicon Graphics
Right or, in the event of a merger of Silicon Graphics into an Acquiring Person,
securities of  the Acquiring  Person having  a  market value  of two  times  the
exercise  price of the Silicon Graphics Right. Under certain conditions, Silicon
Graphics may elect to redeem the Silicon Graphics Rights for a nominal amount or
to exchange the  Silicon Graphics  Rights not held  by an  Acquiring Person  for
Silicon Graphics Common Stock on a one-for-one basis.
 
    The  Silicon Graphics Rights are designed  to protect and maximize the value
of the  outstanding equity  interests of  Silicon Graphics  in the  event of  an
unsolicited  attempt by an acquiror to take over Silicon Graphics in a manner or
on  terms  not  approved  by  the  Silicon  Graphics  Board.  Takeover  attempts
frequently  include  coercive  tactics  to  deprive  a  corporation's  board  of
directors and its stockholders of any real opportunity to determine the  destiny
of  the  corporation. The  Silicon  Graphics Rights  have  been declared  by the
Silicon Graphics  Board in  order to  deter such  tactics, including  a  gradual
accumulation  of shares in  the open market of  a 15% or  greater position to be
followed by a merger or a partial  or two-tier tender offer that does not  treat
all  stockholders equally.  These tactics could  unfairly pressure stockholders,
squeeze them  out of  their investment  without giving  them an  real choice  or
deprive them of the full value of their shares.
 
    The  Silicon  Graphics Rights  are  not intended  to  prevent a  takeover of
Silicon Graphics and will not do  so. Nevertheless, the Silicon Graphics  Rights
may  have the effect of rendering  more difficult or discouraging an acquisition
of Silicon  Graphics  deemed undesirable  by  the Silicon  Graphics  Board.  The
Silicon Graphics Rights may cause substantial dilution to a person or group that
attempts to acquire Silicon Graphics on terms or in a manner not approved by the
Silicon  Graphics  Board,  except  pursuant to  an  offer  conditioned  upon the
negation, purchase or redemption of the Silicon Graphics Rights.
 
    CRAY RIGHTS PLAN.  The Cray Rights Agreement is substantially similar to the
Silicon Graphics Rights Agreement, with the exception of a Flip-In Threshold  of
20%  in contrast  to the  15% Flip-In Threshold  in the  Silicon Graphics Rights
Agreement. On February 25, 1996 the Cray Board approved an amendment to the Cray
Rights Agreement providing that among other things the execution and delivery of
the Merger Agreement and  the making of  the Offer and  the consummation of  the
Merger  and the Offer will not cause  the Cray Rights to become exercisable. See
"The Merger Agreement and Related Agreements -- Representations and Warranties."
 
                        COMPENSATION OF CRAY EXECUTIVES
 
COMPENSATION OF NON-EMPLOYEE DIRECTORS
 
    Cray paid each director during the year ended December 31, 1995, other  than
Messrs.  Ewald and Samper, directors' fees of $20,000 plus $1,000 for each board
and committee  meeting  attended. The  chairs  of the  Audit,  Compensation  and
Development  and  Finance  Committees  each received  an  additional  $1,500 for
chairing those committees.
 
    A retirement income plan established for non-employee directors provided for
payment upon retirement to each director of an amount equal to the final  annual
retainer  times  the number  of  years served  on the  Cray  Board or  15 years,
whichever is less. In  February, 1996, the board  terminated the plan,  freezing
the  benefits payable  to current directors.  No additional  amounts will accrue
under the  plan. In  1995, Cray  accrued $71,330  of expense  and made  payments
totalling $20,000 under the plan.
 
    The  Directors' Plan provides for the  issuance to non-employee directors of
Cray of options to purchase authorized but unissued or reacquired common  stock.
The  Directors' Plan provides for  the granting of an  initial option for 10,000
shares of  common stock  on the  date the  director first  assumes office  as  a
director  and the  grant of an  option for  an additional 1,000  shares upon the
reelection of such
 
                                       46
<PAGE>
director  at  each  subsequent  annual  stockholders'  meeting.  The   directors
nominated to the Cray Board by Merger Sub are not entitled to participate in the
Directors' Plan. The options granted under the Directors' Plan are "nonstatutory
options"  not qualifying  under Section 422  or other similar  provisions of the
Internal Revenue Code. The option price per share for options granted under  the
Directors'  Plan is the  closing price for the  common stock on  the NYSE on the
date of  grant. The  options  granted are  exercisable  in four  successive  25%
cumulative  annual installments commencing one year  after the date of grant and
expire ten years from the date of  grant if unexercised. In February, 1996,  the
Cray  Board approved an  amendment to the Directors'  Plan increasing the annual
grant of options to 2,500.
 
    In  1995,  the  Cray  Board  approved  a  Deferred  Compensation  Plan   for
Non-Employee Directors pursuant to which directors may elect to defer directors'
fees which become payable.
 
EXECUTIVE COMPENSATION
 
    SUMMARY  COMPENSATION TABLE.  The  Summary Compensation Table below includes
individual compensation  information  for  the "named  executive  officers"  for
services  rendered in all capacities during  the fiscal years ended December 31,
1995, 1994 and 1993.
 
SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                    ANNUAL COMPENSATION                 LONG-TERM COMPENSATION
                                          ---------------------------------------  --------------------------------
                                                                   OTHER ANNUAL     RESTRICTED    NUMBER OF SHARES     ALL OTHER
          NAME AND                                                 COMPENSATION    STOCK AWARDED  UNDERLYING STOCK   COMPENSATION
   PRINCIPAL POSITION (1)        YEAR      SALARY     BONUS (2)         (3)             (4)        OPTIONS GRANTED        (5)
- -----------------------------  ---------  ---------  -----------  ---------------  -------------  -----------------  -------------
<S>                            <C>        <C>        <C>          <C>              <C>            <C>                <C>
J. Phillip Samper                   1995  $ 364,626   $ 391,701      $   9,078      $ 4,100,000         300,000        $   4,513
  Chairman and Chief                1994     --          --             --              --               --               --
  Executive Officer                 1993     --          --             --              --               --               --
 
Robert H. Ewald                     1995    378,064     113,710          3,346          953,125         100,000            7,999
  President and Chief               1994    334,497      15,910          6,756          493,125          --                7,326
  Operating Officer                 1993    296,317     159,782          3,380          --               40,000           10,731
 
Laurence L. Betterley               1995    155,627      --              2,189          150,600          22,000            7,000
  Chief Financial                   1994    137,054      20,354         --              --                5,000            7,134
  Officer                           1993    113,734      46,543          2,497          --               10,000            5,633
 
Irene M. Qualters                   1995    168,917      --              2,756          157,680          40,000            7,035
  Senior Vice President             1994    168,257      37,961          2,977          --                7,500            7,414
  Supercomputing Operations         1993    151,757      66,049          2,561          --               10,000            7,278
 
Michael Dungworth                   1995    145,529      83,819         --              151,485          45,000            7,547
  Vice President                    1994    143,249     134,371         --              --                5,000           13,964
  Customer Service                  1993    120,016     111,552         --              --               10,000            8,624
 
Don F. Whiting                      1995    195,187      --              3,893           19,125           7,000          453,501
  (former officer)                  1994    194,171      51,575          3,835          --                7,500            7,188
                                    1993    168,750      99,770          4,113          --               29,500            7,912
</TABLE>
 
- ------------------------------
(1)  Principal position represents the capacity in which the executive served as
     of December 31, 1995.
 
(2)  For 1993 and 1994, the amounts  shown consist of cash compensation  accrued
     during the fiscal year pursuant to the Annual Incentive Plan or Performance
     Incentive  Plan and the cash bonus  under the Incentive Cash Profit Sharing
     Plan. This column shows for Mr. Samper a $100,000 signing bonus for joining
     Cray on May 18, 1995 and a guaranteed bonus of $291,701 provided for  under
     his  employment agreement with  Cray. For Mr. Ewald,  this amount shown for
     1995 includes a  $113,710 bonus for  taking on additional  responsibilities
     during  Cray's search for a CEO from  January 1, 1995 through May 18, 1995.
     For Mr. Dungworth, the 1995 amount includes a $45,375 bonus for  performing
     the  duties of acting  Executive Vice President of  Sales. In addition, Mr.
     Dungworth received a $38,444 bonus for exceeding Customer Service operating
     income goals.
 
(3)  Amounts in this  column represent  compensation related to  income tax  and
     financial  planning  services  provided  to  the  executive.  All executive
     officers of Cray are offered professional income tax services. The cost  of
     these  services and the personal income taxes  owed by the executive on the
     imputed income resulting from the receipt of this benefit are paid by  Cray
     and are reflected in this column.
 
                                       47
<PAGE>
(4)  On January 31, 1995, on which date the price per share of Cray Common Stock
     was  $14.75,  the  following  grants of  restricted  stock  were  made: Mr.
     Dungworth --  1,160  shares,  resulting  in a  valuation  of  $17,110;  Ms.
     Qualters  --  1,580  shares,  resulting  in  a  valuation  of  $23,305; Mr.
     Betterley -- 1,100 shares, resulting in a valuation of $16,225; Mr. Whiting
     -- 1,300 shares resulting in a valuation of $19,175. The shares vest over a
     two year period, 50%  on December 31,  1995 and 50%  on December 31,  1996;
     however,  on Mr. Whiting's  retirement on December 31,  1995, all shares of
     restricted stock granted  to him vested.  On February 27,  1995, Mr.  Ewald
     received  a grant of 50,000 shares of restricted stock. The market price on
     the date of grant  was $16.375, resulting in  a valuation of $818,750.  The
     shares vest 20% each year over a five year period.
 
     In  addition,  Mr. Dungworth,  Ms. Qualters,  Mr.  Betterley and  Mr. Ewald
     received grants of 5,000 shares of restricted stock each on July 25,  1995.
     The  price  per share  on the  date of  grant was  $26.875, resulting  in a
     valuation of $134,375 for each grant. These shares were subject to  vesting
     conditions based on increasing stock price, with 50% vesting when the price
     per  share of Cray Common Stock reaches $31.875 and holds at that level for
     20 consecutive trading  days, and the  balance vesting when  the price  per
     share reaches $36.875 and holds for 20 consecutive trading days.
 
     Mr.  Samper received 200,000  shares of restricted stock  in May, 1995. The
     price per share on the date of  grant was $20.50, resulting in a  valuation
     of  $4,100,000.  The  shares are  subject  to vesting  conditions  based on
     increasing the stock price, with 25% increments vesting when the price  per
     share  reaches and holds  for 20 consecutive trading  days at the following
     levels: $25.00, $30.00, $37.50, and $45.00.
 
     The shares of restricted stock granted to Mr. Ewald in 1994 were subject to
     vesting conditions based on growth in earnings per share over a three  year
     period.  The minimum  vesting requirements were  not met, and  all of these
     shares were forfeited to Cray  as of January 31,  1995. The shares are  not
     currently outstanding and no dividends were paid on such shares.
 
     On  December  31, 1995,  the  price per  share  for Cray  Common  Stock was
     $24.625, resulting in the following valuations for the shares of restricted
     stock held by  the persons named:  Mr. Samper --  $4,925,000; Mr. Ewald  --
     $1,354,375;  Ms.  Qualters  --  $162,033; Mr.  Betterley  --  $150,213; Mr.
     Dungworth -- $151,690; and  Mr. Whiting -- $32,013.  Dividends, if any  are
     declared, would be paid on the outstanding shares of restricted stock.
 
     A  change of  control was  deemed to have  occurred upon  completion of the
     Offer  with  the  result  that  all  vesting  restrictions  on  unforfeited
     restricted  stock  lapsed  and  the  unforfeited  restricted  stock  grants
     referred to above fully vested.
 
(5)  Represents contributions to  Cray's Retirement Savings  Plus Plan and  term
     life  insurance  premiums paid  by Cray  for the  benefit of  the executive
     officer. For Mr. Whiting  the amounts also include  payments to be made  in
     connection with his retirement.
 
     STOCK  OPTIONS.    The following  table  presents,  for each  of  the named
executive officers identified  in the  "Summary Compensation  Table" above,  the
number of shares of common stock purchased upon exercise of stock options during
fiscal year 1995, the aggregate dollar value realized upon exercise based on the
market  price of  the stock on  the dates of  exercise, and the  number of stock
options held  by  such  named  executive  officers  as  of  December  31,  1995,
distinguishing  between options that are exercisable as of December 31, 1995 and
those that will become exercisable at various times in the future.
 
AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR END OPTION
VALUES
 
<TABLE>
<CAPTION>
                                                                           NUMBER OF SHARES          VALUE OF UNEXERCISED
                                                                              UNDERLYING                   IN-THE-
                                                                        UNEXERCISED OPTIONS AT     MONEY OPTIONS AT FY-END
                                         SHARES                                 FY-END                       (1)
                                       ACQUIRED ON         VALUE      --------------------------  --------------------------
NAME                                    EXERCISE         REALIZED     EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- ----------------------------------  -----------------  -------------  -----------  -------------  -----------  -------------
<S>                                 <C>                <C>            <C>          <C>            <C>          <C>
J. Phillip Samper.................              0                0             0        300,000            0      1,425,000
Robert H. Ewald...................              0                0        67,163        120,000            0              0
Laurence L. Betterley.............              0                0        19,183         29,000       17,281         51,844
Irene M. Qualters.................              0                0        36,560         55,875       17,281         51,844
Michael Dungworth.................              0                0         8,475         50,225       12,344         37,031
Don F. Whiting....................              0                0        61,074              0       69,125(2)            0
</TABLE>
 
- ------------------------
(1) The fair market value of Cray Common Stock on December 31, 1995 was  $24.625
    per share.
 
(2) Mr.  Whiting retired on  December 31, 1995.  Upon retirement all outstanding
    options became  exercisable in  accordance with  the terms  of the  Employee
    Stock Option Plan.
 
                                       48
<PAGE>
    A change of control was deemed to have occurred upon completion of the Offer
    with  the result that all outstanding options, including those identified as
    unexercisable at fiscal year end, became fully exercisable.
 
    The following table presents, for each named executive officer identified in
the "Summary Compensation Table" above, the number of shares underlying  options
granted  during 1995, the exercise price for such options, their expiration date
and their potential realizable value. The exercise price for all options granted
was the fair market value of the shares  of common stock of Cray on the date  of
grant.
 
OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                               POTENTIAL REALIZABLE VALUE
                                         NUMBER OF     % OF TOTAL                              AT ASSUMED ANNUAL RATES OF
                                          SHARES        OPTIONS      EXERCISE OR              STOCK PRICE APPRECIATION FOR
                                        UNDERLYING     GRANTED TO    BASE PRICE                     OPTION TERM (2)
                                          OPTIONS     EMPLOYEES IN    PER SHARE   EXPIRATION  ----------------------------
NAME                                      GRANTED     FISCAL YEAR        (1)         DATE          5%             10%
- --------------------------------------  -----------  --------------  -----------  ----------  -------------  -------------
<S>                                     <C>          <C>             <C>          <C>         <C>            <C>
J. Phillip Samper.....................     300,000          21.32%    $  19.875    5/17/05    $   3,749,784  $   9,502,689
Robert H. Ewald.......................     100,000           7.11%    $  26.875    7/25/05    $   1,690,154  $   4,283,183
Irene M. Qualters.....................      40,000           2.84%    $  26.875    7/25/05    $     676,062  $   1,713,273
Laurence L. Betterley.................       7,000           0.50%    $  14.750    1/31/05    $      64,933  $     164,554
                                            15,000           1.07%    $  26.875    7/25/05    $     253,523  $     642,477
Michael Dungworth.....................      40,000           2.84%    $  26.875    7/25/05    $     676,062  $   1,713,273
                                             5,000           0.36%    $  14.750    1/31/05    $      46,381  $     117,539
Don F. Whiting........................       7,000           0.50%    $  14.750    1/31/05    $      64,933  $     164,554
</TABLE>
 
- ------------------------
(1) All options were granted with an exercise price equal to the market price on
    the  date of grant. All  options to the named  executive officers other than
    Mr. Samper become exercisable in 25% annual installments commencing one year
    from the  date of  grant. The  options granted  to Mr.  Samper vest  in  50%
    installments  commencing  one year  from the  grant  date. All  options were
    granted under the Employee Stock Option Plan. A change of control was deemed
    to have  occurred upon  completion of  the Offer  with the  result that  all
    outstanding  options, including the options  reflected in this table, became
    fully exercisable.
 
(2) These values assume options are exercised at the end of their ten year  term
    and  assume a prescribed rate of  stock price appreciation. The actual value
    of these options is  dependent on future performance  of Cray Common  Stock,
    and  there  is  no assurance  the  values  reflected in  the  table  will be
    realized.
 
    Non-cash personal benefits paid  to executive officers  during each year  in
the  three-year period ended December  31, 1995 did not  exceed in the aggregate
the lesser of 10% of cash  compensation or $50,000 for any individual  executive
officer.
 
    Mr.  Samper and Cray entered into an employment agreement in May, 1995, when
Mr. Samper joined  Cray as  Chairman and  CEO. The  term of  the agreement  ends
December 31, 1999. Under the agreement, his 1995 annualized salary was $600,000.
Mr.  Samper's agreement provides for a  guaranteed bonus during the first twelve
months of his employment, regardless of Company performance, equal to 80% of Mr.
Samper's wages up to a maximum guaranteed  bonus of $480,000, and he received  a
bonus  of $291,701 with respect to 1995. The agreement also provided for payment
of a  $100,000 one-time  signing bonus,  the grant  of a  stock option  covering
300,000 shares, and a grant of 200,000 shares of restricted stock. The agreement
with Mr. Samper also provides for certain severance benefits. Unless termination
of Mr. Samper's employment was voluntary (and without justification as described
in  the agreement) or for cause (as  defined in the agreement), Mr. Samper would
continue to receive base salary through  the balance of the agreement's term  or
two  years,  whichever  is  less,  plus any  unpaid  guaranteed  bonus,  plus an
additional two years of base salary less vested benefits under Cray's Retirement
Savings Plus Plan. In the event of death, Cray would pay an amount equal to  six
 
                                       49
<PAGE>
months  base salary  plus any unpaid  guaranteed bonus. Cray  would also provide
relocation benefits  unless  termination  was  for cause.  See  "The  Merger  --
Interests  of Certain Persons in  the Merger" for a  more detailed discussion of
these severance benefits, as well  as a deferred compensation agreement  entered
into  between Cray and Mr. Samper that  modified certain of these benefits. Cray
will also  reimburse  Mr.  Samper  for certain  tax  preparation  and  financial
planning fees up to $15,000 and for certain membership dues.
 
    Cray  and  Mr. Whiting  have  entered into  an  agreement providing  for the
payment in 1996 of $195,187, together with tax preparation expenses up to $2,500
and certain outplacement expenses, in  connection with Mr. Whiting's  retirement
from  Cray as of  December 31, 1995.  In addition, Cray  and Mr. Whiting entered
into a consulting agreement  providing for payment of  $250,000 in March,  1996,
for services related to disposition of certain facilities of Cray.
 
    In  1989, Cray adopted  the Executive Severance  Plan covering employees who
have been elected by the Cray Board  to a position of Vice President or  higher.
The  Executive Severance  Plan provides  for a  payment if  a covered employee's
employment with Cray is terminated (other than voluntarily, by retirement, death
or disability or for  "just cause" as defined  in the Executive Severance  Plan)
within  15  months after  a "change  of  control" (as  defined in  the Executive
Severance Plan) equal  to two  times his or  her annual  compensation. Cray  may
amend  or  terminate the  Plan at  any time  prior  to a  change of  control. In
February, 1996, the  Executive Severance Plan  was amended to  exclude from  the
definition of change of control any transactions approved by the Cray Board. See
"The Merger Agreement and Related Agreements -- Representations and Warranties."
 
    Other than as described above, Cray is not party to any employment agreement
with  any of its executive  officers, and during 1995  it had no pension, profit
sharing, remuneration, incentive or  other retirement, deferred compensation  or
contingent  compensation  plans  of  any  kind solely  for  the  benefit  of its
executive officers.
 
             PROPOSAL TO AMEND AND RESTATE THE CRAY RESEARCH, INC.
                        1989 EMPLOYEE BENEFIT STOCK PLAN
 
    The Employee Stock Option Plan was adopted by the Cray Board on September 7,
1988, and approved by  Cray's stockholders on May  16, 1989. The Employee  Stock
Option  Plan  provides  for  the  grant to  selected  management  and  other key
employees of Cray and its  subsidiaries, including executive officers, of  stock
grants,  grants  of  restricted stock  and  options to  purchase  authorized but
unissued or reacquired  Cray Common  Stock. The  purpose of  the Employee  Stock
Option  Plan is to  attract and retain  persons of ability  and motivate them to
advance the interests  of Cray.  A maximum of  7,888,000 shares  of Cray  Common
Stock have been reserved for the grant of restricted stock and the issuance upon
the  exercise of  stock options  which may be  granted pursuant  to the Employee
Stock Option Plan.  The Employee  Stock Option Plan  provides for  the grant  of
incentive  stock options and  nonstatutory stock options.  As currently drafted,
the Employee Stock Option Plan provides  that the options become exercisable  at
the  rate  of 25%  per year,  beginning one  year  from the  date of  grant. The
Employee Stock Option Plan also  provides for a limited  number of shares to  be
issued  to employees  as stock  grants, which may  or may  not have accompanying
restrictions.
 
    Effective May 3,  1996, the  Cray Board  amended and  restated the  Employee
Stock  Option Plan, subject to  ratification by the stockholders  of Cray at the
Special Meeting, in order  to conform certain provisions  of the Employee  Stock
Option  Plan  to the  analogous provisions  of the  Silicon Graphics,  Inc. 1993
Long-Term Incentive  Stock  Plan  (the  "Plan  Amendment").  The  proposed  Plan
Amendment  will (i) eliminate the current  vesting schedule for future grants of
options in favor of one determined by the Compensation and Development Committee
of the Cray Board (the "Committee") in its discretion at the time of an option's
grant, (ii) eliminate provisions of the Employee Stock Option Plan that cause an
optionee's unvested  options  to  immediately vest  upon  an  optionee's  death,
disability   or  retirement  after   the  age  of   55,  (iii)  shorten  certain
post-termination  exercise  periods  by  providing  that  after  an   optionee's
termination  of  employment due  to death  or disability,  the optionee  (or the
optionee's
 
                                       50
<PAGE>
representative) will be  able to exercise  the options, to  the extent that  the
options  were exercisable at the date of termination, for a period of 12 months,
and that after an optionee's retirement,  the optionee will be able to  exercise
the  options for a period determined  by the Committee (generally three months),
(iv) provide  for  the ability  of  an optionee  to  exercise options  after  an
optionee's  employment  terminates for  any other  reason  for a  limited period
(generally three  months)  that will  be  determined  by the  Committee  in  its
discretion,  (v) eliminate the automatic acceleration of vesting of options that
occurs upon  a  change of  control  of  Cray in  favor  of a  limited  right  to
accelerated  option vesting if an optionee's employment is terminated other than
for cause  within 24  months of  a change  of control  in Cray  (other than  the
Transaction)  and (vi)  add certain methods  of option exercise  to the Employee
Stock Option Plan. The following description of the Employee Stock Option  Plan,
as  amended, is qualified  by reference to  the full text  of the Employee Stock
Option Plan, which is set forth as Annex C to this Proxy Statement/Prospectus.
 
    The Employee Stock Option Plan is administered by the Committee, the members
of which are not eligible to participate in the Employee Stock Option Plan.  The
Committee  has full  power to construe  and interpret the  Employee Stock Option
Plan and  to  establish  rules  and regulations  for  its  administration.  Only
employees  of Cray and its subsidiaries are eligible to be granted options or to
receive stock and restricted stock grants under the Employee Stock Option  Plan.
The Committee will determine the employees to whom, and the number of shares for
which,  incentive stock options or nonstatutory  options will be granted. Shares
subject to options  which expire  or terminate  and shares  of restricted  stock
which  are forfeited may be the subject of new grants of stock, restricted stock
and options under the Employee Stock Option Plan.
 
    The exercise price of an option granted under the Employee Stock Option Plan
will be 100% of the fair market value of the shares of Cray stock subject to the
option at the time of grant of the option. The option exercise price may be paid
in cash, by delivery to Cray of  shares already held by the optionee, through  a
broker-assisted  or cashless  exercise, by delivery  of a promissory  note or by
such other means as is permitted by  applicable law. The fair market value of  a
share  of Cray Common Stock was $29.19 as  of April 30, 1996. The Employee Stock
Option Plan provides for equitable share and price adjustments in the event of a
stock dividend, stock split or similar change in capitalization. Options awarded
under the Employee Stock Option Plan are nontransferable, except by will or  the
laws  of descent and distribution. The Employee Stock Option Plan will terminate
on September 7, 1998, unless terminated earlier by the Cray Board. Options  then
outstanding will remain in effect until exercise or expiration.
 
    At  the time an option is granted, no income is taxable to the optionee, and
Cray is not entitled to a compensation deduction.
 
    The optionee generally does not recognize taxable income upon exercise of an
incentive stock option, and in such case Cray is not entitled to a  compensation
deduction.  Such exercise may, however, subject  the optionee to the alternative
minimum tax. The optionee generally will  recognize gain or loss on  disposition
of Cray Common Stock acquired pursuant to an incentive stock option based on the
difference  between the selling price  and the option exercise  price. If a sale
occurs more than one  year from the  date the Cray Common  Stock was issued  and
more than two years from the date the option was granted, such gain or loss will
be  long-term capital gain  or loss, and Cray  will at no time  be entitled to a
compensation deduction. Gain on a disqualifying disposition of Cray Common Stock
prior to the  expiration of  such holding periods  generally is  taxable to  the
optionee  as ordinary income to the extent that  the market price at the time of
exercise exceeds the option price, and any excess is capital gain.
 
    The optionee  will recognize  ordinary income  at the  time a  non-qualified
option  is exercised  in the  amount by which  the market  price at  the time of
exercise exceeds the option  exercise price. The  optionee will realize  capital
gain or loss at the time of a sale of Cray Common Stock acquired pursuant to the
exercise  of a  non-qualified stock option  based on the  difference between the
selling price and the fair market value at the time of exercise.
 
                                       51
<PAGE>
    Cray will  be entitled  to  a compensation  deduction upon  a  disqualifying
disposition  of  incentive  stock  option  shares and  upon  the  exercise  of a
non-qualified stock  option in  the same  amount and  at the  same time  as  the
optionee  realizes ordinary  income, subject to  Section 162(m)  of the Internal
Revenue Code of 1986, as amended.
 
    The Employee Stock Option Plan provides  that within 24 months of a  "change
in control" of Cray (as determined by the Committee), all unvested options of an
optionee  will immediately  vest if the  optionee's employment  is terminated by
Cray without cause  or if  the optionee  resigns for  certain specified  reasons
during  such period. The Cray Board, without the approval of the stockholders of
Cray, may amend the Employee Stock Option Plan  in any manner it deems to be  in
the  best  interests  of Cray.  Stockholder  approval is  required,  among other
things, to increase the maximum number  of shares subject to the Employee  Stock
Option Plan or restrict the class of management and other key employees eligible
to be granted awards under the Employee Stock Option Plan.
 
    As  a result of the Merger,  Silicon Graphics will assume Cray's obligations
under the Employee Stock Option Plan, and  all references to Cray in such  plan,
and the agreements for options issued under such plan, will thereafter be deemed
to refer to Silicon Graphics.
 
    Approval  and ratification  of the  Plan Amendment  requires the affirmative
vote of the  holders of a  majority of the  votes cast at  the Special  Meeting.
MERGER SUB HAS SUFFICIENT VOTING POWER TO CAUSE THE APPROVAL AND ADOPTION OF THE
PLAN AMENDMENT WITHOUT THE AFFIRMATIVE VOTE OF ANY OTHER STOCKHOLDER.
 
    THE  CRAY BOARD RECOMMENDS  VOTING FOR THE APPROVAL  AND RATIFICATION OF THE
PLAN AMENDMENT.
 
                                    EXPERTS
 
    The consolidated financial statements of  Silicon Graphics at June 30,  1995
and  1994, and for  each of the three  years in the period  ended June 30, 1995,
which have been  incorporated by reference  in this Proxy  Statement/Prospectus,
have  been audited by Ernst  & Young LLP, independent  auditors, as set forth in
their report  thereon incorporated  by  reference herein,  and are  included  in
reliance  upon such report given  upon the authority of  such firm as experts in
accounting and auditing.
 
    The consolidated financial statements of Cray at December 31, 1995 and 1994,
and for each of  the three years  in the period ended  December 31, 1995,  which
have  been incorporated  by reference  in this  Proxy Statement/Prospectus, have
been audited  by  KPMG Peat  Marwick  LLP, independent  public  accountants,  as
indicated  in  their report  with respect  thereto, and  are included  herein in
reliance upon the authority of said  firm as experts in accounting and  auditing
in giving said reports.
 
                                 LEGAL MATTERS
 
    The  validity of the Silicon Graphics  Common Stock issuable pursuant to the
Merger will be  passed upon  for Silicon Graphics  by Shearman  & Sterling,  San
Francisco, California. Proskauer Rose Goetz & Mendelsohn LLP, New York, New York
is  acting as counsel for Cray in connection with certain legal matters relating
to the Merger and the transactions contemplated thereby.
 
                                 OTHER MATTERS
 
    The Cray Board does not intend to bring any matters before the meeting other
than those specifically set forth in the notice of meeting and does not know  of
any  matters to be  brought before the  meeting by others.  If any other matters
properly come before the meeting,  it is the intention  of the persons named  in
the accompanying proxy to vote such proxy in accordance with the judgment of the
Cray Board.
 
                             STOCKHOLDER PROPOSALS
 
    The  date by which stockholder proposals must have been received by Cray for
inclusion in the  proxy statement  and the  form of  proxy for  its 1996  Annual
Meeting  of Stockholders, if  the Merger has  not been consummated  prior to the
date the meeting is to be held, was November 10, 1995.
 
                                       52
<PAGE>
                                                                         ANNEX A
 
                                                            FINAL EXECUTION COPY
 
                          AGREEMENT AND PLAN OF MERGER
 
                                  BY AND AMONG
 
                             SILICON GRAPHICS, INC.
 
                           C ACQUISITION CORPORATION
 
                                      AND
 
                              CRAY RESEARCH, INC.
 
                         DATED AS OF FEBRUARY 25, 1996
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                    PAGE
                                                                                                  ---------
<S>                  <C>                                                                          <C>
 
                                                 ARTICLE I
                                                 THE OFFER
 
SECTION 1.01.        The Offer..................................................................        A-1
SECTION 1.02.        Company Action.............................................................        A-2
SECTION 1.03.        Directors..................................................................        A-3
 
                                                ARTICLE II
                                                THE MERGER
 
SECTION 2.01.        The Merger.................................................................        A-3
SECTION 2.02.        Effective Time.............................................................        A-4
SECTION 2.03.        Effect of the Merger.......................................................        A-4
SECTION 2.04.        Certificate of Incorporation; By-Laws......................................        A-4
SECTION 2.05.        Directors and Officers.....................................................        A-4
SECTION 2.06.        Effect on Capital Stock....................................................        A-4
SECTION 2.07.        Exchange of Certificates...................................................        A-5
SECTION 2.08.        Stock Transfer Books.......................................................        A-7
SECTION 2.09.        Dissenting Shares..........................................................        A-7
SECTION 2.10.        No Further Ownership Rights in Company Common Stock........................        A-7
SECTION 2.11.        Lost, Stolen or Destroyed Certificates.....................................        A-7
SECTION 2.12.        Taking of Necessary Action; Further Action.................................        A-8
 
                                                ARTICLE III
                               REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
SECTION 3.01.        Organization and Qualification; Subsidiaries...............................        A-8
SECTION 3.02.        Certificate of Incorporation and By-Laws...................................        A-8
SECTION 3.03.        Capitalization.............................................................        A-8
SECTION 3.04.        Authority Relative to this Agreement.......................................        A-9
SECTION 3.05.        No Conflict; Required Filings and Consents.................................       A-10
SECTION 3.06.        Compliance; Permits........................................................       A-11
SECTION 3.07.        SEC Filings; Financial Statements..........................................       A-11
SECTION 3.08.        Absence of Certain Changes or Events.......................................       A-12
SECTION 3.09.        No Undisclosed Liabilities.................................................       A-12
SECTION 3.10.        Absence of Litigation......................................................       A-12
SECTION 3.11.        Employee Benefit Plans; Employment Agreements..............................       A-12
SECTION 3.12.        Labor Matters..............................................................       A-14
SECTION 3.13.        Registration Statement; Proxy Statement....................................       A-14
SECTION 3.14.        Restrictions on Business Activities........................................       A-14
SECTION 3.15.        Title to Property..........................................................       A-15
SECTION 3.16.        Taxes......................................................................       A-15
SECTION 3.17.        Environmental Matters......................................................       A-16
SECTION 3.18.        Brokers....................................................................       A-17
SECTION 3.19.        Intellectual Property......................................................       A-17
SECTION 3.20.        Vote Required..............................................................       A-18
</TABLE>
 
                                       i
<PAGE>
<TABLE>
<CAPTION>
                                                                                                    PAGE
                                                                                                  ---------
<S>                  <C>                                                                          <C>
SECTION 3.21.        Opinion of Financial Advisor...............................................       A-18
SECTION 3.22.        Full Disclosure............................................................       A-18
 
                                                ARTICLE IV
                          REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB
 
SECTION 4.01.        Organization and Qualification.............................................       A-18
SECTION 4.02.        Authority Relative to This Agreement.......................................       A-18
SECTION 4.03.        No Conflict; Required Filings and Consents.................................       A-19
SECTION 4.04.        Certificate of Incorporation and By-Laws...................................       A-19
SECTION 4.05.        Capitalization.............................................................       A-19
SECTION 4.06.        Compliance; Permits........................................................       A-20
SECTION 4.07.        SEC Filings; Financial Statements..........................................       A-20
SECTION 4.08.        Absence of Certain Changes or Events.......................................       A-21
SECTION 4.09.        Restrictions on Business Activities........................................       A-21
SECTION 4.10.        Title to Property..........................................................       A-21
SECTION 4.11.        No Undisclosed Liabilities.................................................       A-21
SECTION 4.12.        Absence of Litigation......................................................       A-21
SECTION 4.13.        Registration Statement; Proxy Statement/Prospectus.........................       A-21
SECTION 4.14.        Brokers....................................................................       A-22
SECTION 4.15.        No Stockholder Vote........................................................       A-22
SECTION 4.16.        Financing..................................................................       A-22
SECTION 4.17.        Full Disclosure............................................................       A-22
 
                                                 ARTICLE V
                                  CONDUCT OF BUSINESS PENDING THE MERGER
 
SECTION 5.01.        Conduct of Business by the Company Pending the Merger......................       A-22
SECTION 5.02.        No Solicitation............................................................       A-24
SECTION 5.03.        Conduct of Business by Parent Pending the Merger...........................       A-25
 
                                                ARTICLE VI
                                           ADDITIONAL AGREEMENTS
 
SECTION 6.01.        Proxy Statement/Prospectus; Registration Statement.........................       A-25
SECTION 6.02.        Stockholders' Meeting......................................................       A-26
SECTION 6.03.        Access to Information; Confidentiality.....................................       A-26
SECTION 6.04.        Consents; Approvals........................................................       A-26
SECTION 6.05.        Stock Options..............................................................       A-26
SECTION 6.06.        Company Stock Purchase Plan................................................       A-27
SECTION 6.07.        Employment Matters.........................................................       A-27
SECTION 6.08.        Agreements of Affiliates...................................................       A-27
SECTION 6.09.        Indemnification............................................................       A-27
SECTION 6.10.        Notification of Certain Matters............................................       A-28
SECTION 6.11.        Further Action.............................................................       A-28
SECTION 6.12.        Public Announcements.......................................................       A-28
SECTION 6.13.        Listing of Parent Common Shares............................................       A-28
 
                                                ARTICLE VII
                                         CONDITIONS TO THE MERGER
 
SECTION 7.01.        Conditions to Obligation of Each Party to Effect the Merger................       A-29
</TABLE>
 
                                       ii
<PAGE>
<TABLE>
<CAPTION>
                                                                                                    PAGE
                                                                                                  ---------
<S>                  <C>                                                                          <C>
SECTION 7.02.        Additional Conditions to Obligations of Parent and Merger Sub..............       A-29
SECTION 7.03.        Additional Conditions to Obligation of the Company.........................       A-30
 
                                               ARTICLE VIII
                                                TERMINATION
 
SECTION 8.01.        Termination................................................................       A-30
SECTION 8.02.        Effect of Termination......................................................       A-31
SECTION 8.03.        Fees and Expenses..........................................................       A-31
 
                                                ARTICLE IX
                                            GENERAL PROVISIONS
 
SECTION 9.01.        Effectiveness of Representations, Warranties and Agreements................       A-32
SECTION 9.02.        Notices....................................................................       A-32
SECTION 9.03.        Certain Definitions........................................................       A-33
SECTION 9.04.        Amendment..................................................................       A-34
SECTION 9.05.        Waiver.....................................................................       A-34
SECTION 9.06.        Headings...................................................................       A-34
SECTION 9.07.        Severability...............................................................       A-34
SECTION 9.08.        Entire Agreement...........................................................       A-34
SECTION 9.09.        Assignment, Merger Sub.....................................................       A-34
SECTION 9.10.        Parties in Interest........................................................       A-34
SECTION 9.11.        Failure or Indulgence Not Waiver; Remedies Cumulative......................       A-35
SECTION 9.12.        GOVERNING LAW..............................................................       A-35
SECTION 9.13.        Counterparts...............................................................       A-35
SECTION 9.14.        WAIVER OF JURY TRIAL.......................................................       A-35
 
Annexes:
 
Annex A:  Conditions to the Offer...............................................................       A-36
 
Annex B:  Certain Employee Matters..............................................................       A-38
 
Annex C:  Form of Affiliate Agreement...........................................................       A-40
</TABLE>
 
                                      iii
<PAGE>
                          AGREEMENT AND PLAN OF MERGER
 
    AGREEMENT  AND  PLAN  OF  MERGER,  dated  as  of  February  25,  1996  (this
"AGREEMENT"), among SILICON GRAPHICS, INC., a Delaware corporation ("PARENT"), C
ACQUISITION CORPORATION, a Delaware corporation and a wholly owned subsidiary of
Parent ("MERGER  SUB"), and  CRAY RESEARCH,  INC., a  Delaware corporation  (the
"COMPANY"),
 
                              W I T N E S S E T H:
 
    WHEREAS,  the boards of directors of Parent, Merger Sub and the Company have
each determined  that  it  is advisable  and  in  the best  interests  of  their
respective stockholders for Parent to enter into a business combination with the
Company upon the terms and subject to the conditions set forth herein;
 
    WHEREAS,  in furtherance of such combination, it is proposed that Merger Sub
shall make a cash tender offer (the "OFFER") to acquire 19,218,735 of the issued
and outstanding  shares of  common stock,  par  value $1.00  per share,  of  the
Company ("COMPANY COMMON STOCK") and the associated Common Share Purchase Rights
(the  "RIGHTS") (shares  of Company  Common Stock  together with  the associated
Rights being hereinafter collectively  referred to as  "SHARES") for $30.00  per
Share  (such amount, or any greater amount per Share paid pursuant to the Offer,
being hereinafter referred to as  the "PER SHARE AMOUNT")  net to the seller  in
cash,  upon the terms  and subject to  the conditions of  this Agreement and the
Offer;
 
    WHEREAS, the board of  directors of the Company  (the "BOARD") has  approved
the  making of the  Offer and resolved  and agreed to  recommend that holders of
Shares tender their Shares pursuant to the Offer;
 
    WHEREAS, also in furtherance of such combination, the boards of directors of
Parent, Merger Sub and the Company have each approved the merger (the  "MERGER")
of  Merger  Sub with  and into  the  Company in  accordance with  the applicable
provisions of the Delaware  General Corporation Law  ("DELAWARE LAW"), and  upon
the terms and subject to the conditions set forth herein;
 
    WHEREAS,  pursuant to the Merger, each  outstanding Share shall be converted
into the  right to  receive  the Merger  Consideration  (as defined  in  Section
2.07(b)),  consisting of shares of common stock,  par value $0.001 per share, of
Parent ("PARENT  COMMON STOCK")  and, if  applicable, cash  upon the  terms  and
subject to the conditions set forth herein;
 
    NOW,  THEREFORE, in consideration of the  foregoing and the mutual covenants
and agreements  herein contained,  and  intending to  be legally  bound  hereby,
Parent, Merger Sub and the Company hereby agree as follows:
 
                                   ARTICLE I
                                   THE OFFER
 
    SECTION  1.01.  THE OFFER.  (a)  Provided that this Agreement shall not have
been terminated in accordance with Section 8.01 and none of the events set forth
in ANNEX A shall  have occurred or  be existing, Merger  Sub shall commence  the
Offer  as promptly as  reasonably practicable after  the date hereof,  but in no
event later than  five business days  after the initial  public announcement  of
Merger  Sub's intention to commence  the Offer. The obligation  of Merger Sub to
accept for payment and pay for Shares tendered pursuant to the Offer shall  only
be  subject to  (i) the  condition (the "MINIMUM  CONDITION") that  at least the
number of Shares that  when added to  the Shares already  owned by Parent  shall
constitute  a majority of the  then outstanding Shares on  a fully diluted basis
shall have been validly  tendered and not withdrawn  prior to the expiration  of
the  Offer and (ii) the satisfaction or waiver of the other conditions set forth
in ANNEX A. Merger Sub expressly reserves the right to waive any such  condition
(other  than the Minimum Condition), to increase  the price per Share payable in
the Offer and  to make  any other  changes in the  terms and  conditions of  the
Offer; PROVIDED, HOWEVER,
 
                                      A-1
<PAGE>
that unless Parent and Merger Sub shall have obtained the prior written approval
of the Company, no change may be made in the Offer which (i) decreases the price
per  Share payable in  the Offer, (ii)  changes the form  of consideration to be
paid in the Offer, (iii) reduces the maximum number of Shares to be purchased in
the Offer, (iv)  changes or waives  the Minimum Condition,  or (v) modifies  the
conditions  to the Offer set forth in ANNEX A or imposes conditions to the Offer
in addition to those set forth in  ANNEX A. The Per Share Amount shall,  subject
to applicable withholding of taxes, be net to the seller in cash, upon the terms
and  subject to the conditions of the Offer. Subject to the terms and conditions
of the Offer (including, without limitation, the Minimum Condition), Merger  Sub
shall,  and Parent shall cause Merger Sub to, accept for payment and pay for, as
promptly as  practicable  after expiration  of  the Offer,  all  Shares  validly
tendered   and  not  withdrawn;  PROVIDED,  HOWEVER,  that  notwithstanding  the
foregoing Parent may, in its sole discretion, extend the expiration date of  the
Offer  for up to 15 business  days, and agrees on a  one-time basis if all other
conditions to the Offer  have been met,  to extend the  expiration date for  the
Offer for 10 business days if on the relevant date of expiration at least 45% of
the  then outstanding  Shares (calculated  on a  fully diluted  basis) have been
tendered and not withdrawn from the Offer.
 
    (b) As soon as practicable on the date of commencement of the Offer,  Merger
Sub  shall file with the Securities and Exchange Commission (the "SEC") a Tender
Offer Statement on Schedule 14D-1 (together with all amendments and  supplements
thereto,  the "SCHEDULE  14D-1") with respect  to the Offer.  The Schedule 14D-1
shall contain or shall incorporate by reference an offer to purchase (the "OFFER
TO PURCHASE") and  forms of the  related letter of  transmittal and any  related
summary  advertisement (the Schedule 14D-1, the Offer to Purchase and such other
documents, together with all supplements and amendments thereto, being  referred
to  herein  collectively as  the "OFFER  DOCUMENTS").  The Offer  Documents will
comply in  all  material respects  with  the provisions  of  applicable  federal
securities  laws. Parent, Merger  Sub and the Company  agree to correct promptly
any information provided by  any of them  for use in  the Offer Documents  which
shall  have become false or misleading, and  Parent and Merger Sub further agree
to take all steps necessary  to cause the Schedule 14D-1  as so corrected to  be
filed  with  the  SEC  and the  other  Offer  Documents as  so  corrected  to be
disseminated to holders of Shares, in each case as and to the extent required by
applicable federal securities laws. Parent and Merger Sub shall give the Company
and its counsel the opportunity to  review and comment upon the Offer  Documents
prior to their being filed with, or sent to, the SEC.
 
    SECTION  1.02.   COMPANY ACTION.   (a)  The Company  hereby approves  of and
consents to the Offer and  represents that the Board,  at a meeting duly  called
and  held on February  25, 1996, has  (i) unanimously approved  and adopted this
Agreement and the transactions contemplated hereby, including the Offer and  the
Merger   (the  "TRANSACTIONS"),  and  (ii)   unanimously  recommended  that  the
stockholders of  the  Company  accept  the Offer  and  approve  and  adopt  this
Agreement  and the Transactions. The Company hereby consents to the inclusion in
the Offer  Documents  of  the  recommendation of  the  Board  described  in  the
immediately  preceding  sentence,  subject  to the  second  sentence  of Section
5.02(a).
 
    (b) As soon as  practicable on the  date of commencement  of the Offer,  the
Company  shall  file with  the  SEC a  Solicitation/Recommendation  Statement on
Schedule 14D-9  (together  with  all amendments  and  supplements  thereto,  the
"SCHEDULE  14D-9")  containing  the  recommendation of  the  Board  described in
Section 1.02(a) and shall disseminate the Schedule 14D-9 to the extent  required
by  Rule 14d-9 promulgated under the Securities Exchange Act of 1934, as amended
(the "EXCHANGE  ACT"), and  any other  applicable federal  securities laws.  The
Schedule 14D-9 will comply in all other material respects with the provisions of
applicable  federal securities laws. The Company, Parent and Merger Sub agree to
correct promptly any information provided by any of them for use in the Schedule
14D-9 which  shall have  become false  or misleading,  and the  Company  further
agrees  to take all steps necessary to  cause the Schedule 14D-9 as so corrected
to be filed with the SEC and disseminated to holders of Shares, in each case  as
and to the extent required by applicable federal securities laws.
 
                                      A-2
<PAGE>
    (c)  The  Company  shall promptly  furnish  Merger Sub  with  mailing labels
containing the names  and addresses  of all record  holders of  Shares and  with
security  position listings of Shares  held in stock depositories,  each as of a
recent date,  together with  all  other available  listings and  computer  files
containing names, addresses and security position listings of record holders and
beneficial  owners of  Shares. The  Company shall  furnish Merger  Sub with such
additional information,  including,  without limitation,  updated  listings  and
computer  files of stockholders, mailing  labels and security position listings,
and such other assistance as Parent,  Merger Sub or their agents may  reasonably
request.  Subject to  the requirements  of applicable  law, and  except for such
steps as  are  necessary  to  disseminate the  Offer  Documents  and  any  other
documents necessary to consummate the Offer or the Merger, Parent and Merger Sub
shall, and each of Parent and Merger Sub shall cause its affiliates, associates,
agents and advisors to, (i) hold in confidence the information contained in such
labels,  listings and files,  (ii) use such information  only in connection with
the Offer and the  Merger, and (iii)  if this Agreement  shall be terminated  in
accordance  with  Section  8.01,  promptly deliver  to  the  Company  all copies
(whether in human or  machine readable form) of  such information then in  their
possession.
 
    SECTION 1.03.  DIRECTORS.  (a) Promptly upon the purchase by Merger Sub of a
majority  of the outstanding Shares pursuant to the Offer, and from time to time
thereafter as Shares are acquired by  Merger Sub, Merger Sub shall be  entitled,
subject  to compliance with Section 14(f) of the Exchange Act, to designate such
number of directors, rounded up to the next greatest whole number, on the  Board
as  will give  Merger Sub representation  on the  Board equal to  that number of
directors which equals the product of the total number of directors on the Board
(giving effect to the directors appointed  or elected pursuant to this  sentence
and  including current directors serving as  officers of the Company) multiplied
by the percentage  that the  aggregate number  of Shares  beneficially owned  by
Merger  Sub  or any  affiliate of  Merger  Sub (including  for purposes  of this
Section 1.03 such Shares as are accepted for payment pursuant to the Offer,  but
excluding  Shares held  by the Company  or any  of its affiliates)  bears to the
number of Shares  outstanding. At such  times, the Company  will also cause  (i)
each  committee of the Board of Directors,  (ii) if requested by Merger Sub, the
board of directors of each of the Company's subsidiaries and (iii) if  requested
by  Merger Sub, each  committee of such  board to include  persons designated by
Merger Sub constituting the same percentage  of each such committee or board  as
Merger  Sub's designees  are of  the Board. The  Company shall,  upon request by
Merger Sub, promptly increase the size of the Board or exercise its best efforts
to secure the resignations of such number of directors as is necessary to enable
Merger Sub designees to  be elected to  the Board and  shall cause Merger  Sub's
designees to be so elected.
 
    (b)  Subject to applicable  law, the Company shall  promptly take all action
necessary pursuant  to  Section  14(f)  of  the  Exchange  Act  and  Rule  14f-1
promulgated  thereunder in order  to fulfill its  obligations under this Section
1.03 and shall  include in the  Schedule 14D-9 mailed  to stockholders  promptly
after  the commencement of the Offer (or  an amendment thereof or an information
statement pursuant to Rule  14f-1 if Merger Sub  has not theretofore  designated
directors)  such information  with respect to  the Company and  its officers and
directors as is required under Section 14(f) and Rule 14f-1 in order to  fulfill
its  obligations under this Section 1.03. Parent  and Merger Sub will supply the
Company and be solely responsible for any information with respect to itself and
its nominees, officers, directors and  affiliates required by Section 14(f)  and
Rule 14f-1.
 
                                   ARTICLE II
                                   THE MERGER
 
    SECTION 2.01.  THE MERGER.  (a) Upon the terms and subject to the conditions
set  forth  in this  Agreement,  and in  accordance  with Delaware  Law,  at the
Effective Time (as defined below) Merger Sub  shall be merged with and into  the
Company.  As a result of the Merger,  the separate corporate existence of Merger
Sub shall cease and the Company  shall continue as the surviving corporation  of
the Merger (the "SURVIVING CORPORATION").
 
                                      A-3
<PAGE>
    (b)  Unless this Agreement  shall have been  terminated and the transactions
herein contemplated  shall have  been  abandoned pursuant  to Section  8.01  and
subject  to the satisfaction  or waiver of  the conditions set  forth in Article
VII, the consummation of the Merger  will take place as promptly as  practicable
(and  in any event within two business days) after satisfaction or waiver of the
conditions set forth in Article VII, at the offices of Shearman & Sterling,  555
California  Street, Suite 2000, San  Francisco, California, unless another date,
time or place is agreed to in writing by the parties hereto.
 
    SECTION 2.02.    EFFECTIVE TIME.    As  promptly as  practicable  after  the
satisfaction  or waiver of the conditions set  forth in Article VII, the parties
hereto shall cause the Merger  to be consummated by  filing this Agreement or  a
certificate  of merger or  certificate of ownership and  merger (in either case,
the "Certificate  of  Merger") with  the  Secretary of  State  of the  State  of
Delaware,  in such  form as  required by,  and executed  in accordance  with the
relevant provisions of, Delaware Law (the date and time of such filing being the
"EFFECTIVE TIME").
 
    SECTION 2.03.  EFFECT OF THE MERGER.   At the Effective Time, the effect  of
the Merger shall be as provided in this Agreement, the Certificate of Merger and
the  applicable provisions of  Delaware Law. Without  limiting the generality of
the foregoing, and  subject thereto,  at the  Effective Time  all the  property,
rights,  privileges, powers and  franchises of the Company  and Merger Sub shall
vest in the Surviving Corporation, and all debts, liabilities and duties of  the
Company  and Merger Sub  shall become the  debts, liabilities and  duties of the
Surviving Corporation.
 
    SECTION 2.04.  CERTIFICATE  OF INCORPORATION; BY-LAWS.   (a) CERTIFICATE  OF
INCORPORATION.  Unless  otherwise determined  by Parent  prior to  the Effective
Time, at the Effective Time the  Certificate of Incorporation of Merger Sub,  as
in  effect immediately prior to the Effective  Time, shall be the Certificate of
Incorporation of the Surviving Corporation until thereafter amended as  provided
by  Delaware Law and such Certificate  of Incorporation; PROVIDED, HOWEVER, that
Article I of the Certificate of Incorporation of the Surviving Corporation shall
be amended to  read as  follows: "FIRST:  The name  of the  corporation is  Cray
Research, Inc."
 
    (b)   BY-LAWS.  The By-Laws of Merger Sub, as in effect immediately prior to
the Effective Time,  shall be  the By-Laws  of the  Surviving Corporation  until
thereafter amended as provided by Delaware Law, the Certificate of Incorporation
of the Surviving Corporation and such By-Laws.
 
    SECTION  2.05.    DIRECTORS  AND  OFFICERS.   The  directors  of  Merger Sub
immediately prior to the  Effective Time shall be  the initial directors of  the
Surviving  Corporation, each to  hold office in accordance  with the Articles of
Incorporation and By-Laws of the Surviving Corporation, and the officers of  the
Company immediately prior to the Effective Time shall be the initial officers of
the  Surviving Corporation, in  each case until  their respective successors are
duly elected or appointed and qualified.
 
    SECTION 2.06.  EFFECT ON CAPITAL STOCK.  At the Effective Time, by virtue of
the Merger and without any action on the part of Parent, Merger Sub, the Company
or the holders of any of the following securities:
 
    (a)  CANCELLATION.  Each Share held in the treasury of the Company and  each
Share  owned  by Parent,  Merger  Sub or  any  direct or  indirect  wholly owned
subsidiary of the  Company or  Parent immediately  prior to  the Effective  Time
("INELIGIBLE  SHARES") shall, by virtue of the  Merger and without any action on
the part of the holder thereof, cease to be outstanding, be canceled and retired
without payment of any consideration therefor and cease to exist.
 
    (b)  CONVERSION OF SECURITIES.   Subject to Section 2.06(f), each  remaining
outstanding  Share (other  than Dissenting Shares)  shall be  converted into the
right to receive (i) 1.00 fully  paid and non-assessable share of Parent  Common
Stock  (the "EXCHANGE RATIO"); provided, however, that if Merger Sub accepts for
payment and pays for less than  19,218,735 (the "OFFERED NUMBER") Shares in  the
Offer  (the number of Shares so accepted for payment and paid for being referred
to herein as  the "ACCEPTED  SHARE NUMBER"), then  the Exchange  Ratio shall  be
equal  to a fraction (the "ADJUSTED EXCHANGE RATIO"), (A) the numerator of which
is   equal   to   (x)   the    number   of   outstanding   Shares    immediately
 
                                      A-4
<PAGE>
prior   to  the  Effective  Time   (excluding  Ineligible  Shares)  (the  "FINAL
OUTSTANDING NUMBER") PLUS (y)  the Accepted Share Number  MINUS (z) the  Offered
Number and (B) the denominator of which is the Final Outstanding Number and (ii)
if  the Exchange Ratio  has been adjusted pursuant  to the immediately preceding
PROVISO, an amount in cash  equal to a fraction, (A)  the numerator of which  is
the  product of the Per Share Amount and  the amount by which the Offered Number
exceeds the Accepted Share Number and (B) the denominator of which is the  Final
Outstanding Number.
 
    (c)   ASSUMPTION OF STOCK OPTIONS AND STOCK PURCHASE RIGHTS.  All options to
purchase Company  Common  Stock  granted  under the  Cray  Research,  Inc.  1985
Incentive  Stock Option and Nonstatutory Option Plan (the "1985 EMPLOYEE PLAN"),
the Cray Research, Inc.  1989 Employee Benefit Stock  Plan (the "EMPLOYEE  STOCK
PLAN")  and the  Cray Research, Inc.  1989 Non-Employee  Directors' Stock Option
Plan (the "DIRECTORS' PLAN"  and, together with the  1985 Employee Plan and  the
Employee  Stock  Plan,  the  "STOCK  OPTION PLANS")  or  pursuant  to  any other
arrangement adopted by the  Board to provide options  to directors, officers  or
employees  of the Company (in any such case, an "OPTION") then outstanding shall
be assumed by Parent in accordance  with Section 6.05. Immediately prior to  the
Effective  Time, all  rights to purchase  Company Common  Stock then outstanding
under the Company's Qualified Stock Purchase Investment Plan (the "COMPANY STOCK
PURCHASE PLAN")  shall be  converted  into shares  of  Company Common  Stock  in
accordance with Section 6.06.
 
    (d)  CAPITAL STOCK OF MERGER SUB.  Each share of common stock, no par value,
of  Merger Sub  issued and outstanding  immediately prior to  the Effective Time
shall be converted  into and exchanged  for one validly  issued, fully paid  and
nonassessable share of common stock, no par value, of the Surviving Corporation.
Each  stock certificate  of Merger Sub  evidencing ownership of  any such shares
shall continue to  evidence ownership  of such shares  of capital  stock of  the
Surviving Corporation.
 
    (e)  ADJUSTMENTS TO EXCHANGE RATIO.  The Exchange Ratio shall be adjusted to
reflect  fully  the effect  of any  stock split,  reverse split,  stock dividend
(including any dividend  or distribution of  securities convertible into  Parent
Common Stock or Company Common Stock), reorganization, recapitalization or other
like  change with  respect to  Parent Common Stock  or Company  Common Stock the
record date  for which  shall  occur after  the date  hereof  and prior  to  the
Effective Time.
 
    (f)   FRACTIONAL SHARES.  No fraction of a share of Parent Common Stock will
be issued, but in  lieu thereof each  holder of Company  Common Stock who  would
otherwise  be entitled to  a fraction of  a share of  Parent Common Stock (after
aggregating all fractional shares of Parent Common Stock to be received by  such
holder)  shall receive  from Parent  an amount of  cash (rounded  to the nearest
whole cent),  without interest,  equal  to the  product  of (i)  such  fraction,
multiplied  by (ii) the average of the closing price for trades of Parent Common
Stock as  of  each of  the  thirty  (30) consecutive  trading  days  immediately
preceding  the Effective  Time as  quoted in  the Wall  Street Journal  or other
reliable financial newspaper or publication.  For the purposes of the  preceding
sentence,  a "trading day" means a day on which trading generally takes place on
the New York Stock Exchange (the "NYSE")  and on which trading in Parent  Common
Stock has occurred.
 
    (g)  CONVERTIBLE DEBENTURES.  The 6 1/8% Convertible Subordinated Debentures
due  2011 of the  Company (the "CONVERTIBLE DEBENTURES")  shall, pursuant to the
terms of  the Indenture  between  the Company  and Manufacturers  Hanover  Trust
Company  (the "TRUSTEE"), dated as of February 1, 1986 (the "INDENTURE"), become
thereafter convertible only into  that number of shares  of Parent Common  Stock
and  cash, if any, that the holder of any such Convertible Debentures would have
received if such  holder had converted  such Convertible Debentures  immediately
prior  to the  Effective Time  as provided  in Section  15.06 of  the Indenture.
Parent shall execute  and deliver  a supplemental  indenture (the  "SUPPLEMENTAL
INDENTURE"),  which  shall  evidence  Parent's  assumption  of  the  Convertible
Debentures and provide that the holder of each Convertible Debenture shall  have
the  right thereafter to convert such  Convertible Debenture as described above,
in each case in accordance with the terms of the Indenture.
 
    SECTION 2.07.  EXCHANGE OF CERTIFICATES.   (a) EXCHANGE AGENT. Parent  shall
deposit,  or shall cause  to be deposited,  to or for  the account of  a bank or
trust company designated by Parent (the
 
                                      A-5
<PAGE>
"EXCHANGE AGENT"), in  trust for the  benefit of the  holders of Company  Common
Stock  (other  than Dissenting  Shares), for  exchange  in accordance  with this
Section 2.07, through  the Exchange  Agent, certificates  evidencing the  Parent
Common  Stock and, if applicable, the  cash portion of the Merger Consideration,
issuable pursuant to Section 2.06 in exchange for outstanding Shares.
 
    (b)   EXCHANGE PROCEDURES.   As  soon as  reasonably practicable  after  the
Effective  Time, Parent will instruct the Exchange  Agent to mail to each holder
of record  of a  certificate  or certificates  which  immediately prior  to  the
Effective  Time evidenced outstanding Shares (other than Dissenting Shares) (the
"CERTIFICATES") (i) a letter of  transmittal (which shall specify that  delivery
shall  be effected, and risk  of loss and title  to the Certificates shall pass,
only upon proper delivery of the Certificates to the Exchange Agent and shall be
in such form and  have such other provisions  as Parent may reasonably  specify)
and  (ii) instructions to  effect the surrender of  the Certificates in exchange
for the certificates evidencing  shares of Parent Common  Stock and, in lieu  of
any fractional shares thereof, cash, and, if applicable, the cash portion of the
Merger  Consideration payable pursuant  to Section 2.06(b).  Upon surrender of a
Certificate for cancellation to the Exchange Agent together with such letter  of
transmittal,  duly  executed,  and  such other  customary  documents  as  may be
required pursuant to such instructions, the holder of such Certificate shall  be
entitled to receive in exchange therefor (A) certificates evidencing that number
of  whole  shares of  Parent Common  Stock which  such holder  has the  right to
receive in accordance with the Exchange Ratio in respect of the Shares  formerly
evidenced  by such  Certificate, (B)  the amount of  cash, if  any, payable with
respect to such shares pursuant to  Section 2.06(b), (C) any dividends or  other
distributions  to which such holder is entitled pursuant to Section 2.07(c), and
(D) cash in  lieu of  fractional shares  of Parent  Common Stock  to which  such
holder  is entitled pursuant to Section  2.06(f) (the Parent Common Stock, cash,
dividends and distributions described  in clauses (A), (B),  (C) and (D)  being,
collectively,  the "MERGER  CONSIDERATION"), and the  Certificate so surrendered
shall forthwith be canceled. In the event  of a transfer of ownership of  Shares
which  is  not registered  in  the transfer  records of  the  Company as  of the
Effective Time, the Merger  Consideration may be issued  and paid in  accordance
with  this Article II to a transferee  if the Certificate evidencing such Shares
is presented to  the Exchange Agent,  accompanied by all  documents required  to
evidence  and  effect such  transfer  pursuant to  this  Section 2.07(b)  and by
evidence that  any applicable  stock transfer  taxes have  been paid.  Until  so
surrendered,  each outstanding  Certificate that,  prior to  the Effective Time,
represented shares of the Company Common Stock will be deemed from and after the
Effective Time, for all corporate purposes, other than the payment of dividends,
to evidence the ownership of  the number of full  shares of Parent Common  Stock
into which such shares of the Company Common Stock shall have been so converted,
the  right to receive the cash portion  of the Merger Consideration payable with
respect thereto pursuant to Section 2.06(b)  and the right to receive an  amount
in  cash in  lieu of the  issuance of  any fractional shares  in accordance with
Section 2.06(f).
 
    (c)  DISTRIBUTIONS  WITH RESPECT  TO UNEXCHANGED  SHARES.   No dividends  or
other  distributions declared or  made after the Effective  Time with respect to
Parent Common Stock with a record date after the Effective Time shall be paid to
the holder of any unsurrendered Certificate until the holder of such Certificate
shall surrender such Certificate. Subject to applicable law, following surrender
of any  such Certificate,  there  shall be  paid to  the  record holder  of  the
certificates representing whole shares of Parent Common Stock issued in exchange
therefor,  without  interest,  at the  time  of  such surrender,  the  amount of
dividends or other  distributions with a  record date after  the Effective  Time
theretofore paid with respect to such whole shares of Parent Common Stock.
 
    (d)  TRANSFERS OF OWNERSHIP.  If any certificate for shares of Parent Common
Stock  is  to be  issued in  a name  other  than that  in which  the Certificate
surrendered in exchange therefor  is registered, it will  be a condition of  the
issuance  thereof that the Certificate so  surrendered will be properly endorsed
and otherwise in proper  form for transfer and  that the person requesting  such
exchange will have paid to Parent or any person designated by it any transfer or
other taxes required
 
                                      A-6
<PAGE>
by  reason of the issuance of a certificate for shares of Parent Common Stock in
any  name  other  than  that  of  the  registered  holder  of  the   certificate
surrendered,  or  established  to  the  satisfaction  of  Parent  or  any  agent
designated by it that such tax has been paid or is not payable.
 
    (e)  NO  LIABILITY.  Neither  Parent, Merger  Sub nor the  Company shall  be
liable  to any holder of  Company Common Stock for  any Merger Consideration (or
dividends or distributions with respect thereto) delivered to a public  official
pursuant to any applicable abandoned property, escheat or similar law.
 
    (f)  WITHHOLDING RIGHTS.  Parent, the Surviving Corporation and the Exchange
Agent  shall be  entitled to deduct  and withhold from  the Merger Consideration
otherwise payable pursuant  to this Agreement  to any holder  of Company  Common
Stock such amounts as Parent, the Surviving Corporation or the Exchange Agent is
required to deduct and withhold with respect to the making of such payment under
the  Internal Revenue Code of 1986, as  amended (the "CODE") or any provision of
state, local, provincial or foreign tax law.  To the extent that amounts are  so
withheld,  such  withheld amounts  shall  be treated  for  all purposes  of this
Agreement as having been paid  to the holder of the  Shares in respect of  which
such deduction and withholding was made.
 
    SECTION  2.08.   STOCK TRANSFER  BOOKS.   At the  Effective Time,  the stock
transfer books of the  Company shall be  closed, and there  shall be no  further
registration  of transfers of the Company Common Stock thereafter on the records
of the Company.
 
    SECTION 2.09.  DISSENTING SHARES.  (a) Notwithstanding any provision of this
Agreement to the contrary, Shares that are outstanding immediately prior to  the
Effective  Time and which are  held by stockholders who  shall have not voted in
favor of the Merger or consented thereto in writing and who shall have available
to them  and who  shall have  demanded properly  in writing  appraisal for  such
Shares  in  accordance  with  Section 262  of  Delaware  Law  (collectively, the
"DISSENTING SHARES')  shall not  be converted  into or  represent the  right  to
receive the Merger Consideration. Such stockholders shall be entitled to receive
payment  of the appraised value  of such Shares held  by them in accordance with
the provisions of such  Section 262, except that  all Dissenting Shares held  by
stockholders  who shall  have failed  to perfect  or who  effectively shall have
withdrawn or lost their  rights to appraisal of  such Shares under such  Section
262  shall thereupon be  deemed to have  been converted into  and to have become
exchangeable for, as  of the  Effective Time, the  right to  receive the  Merger
Consideration,  without  any interest  thereon,  upon surrender,  in  the manner
provided in  Section 2.07,  of  the certificate  or certificates  that  formerly
evidenced such Shares.
 
    (b)  The Company  shall give  Parent (i)  prompt notice  of any  demands for
appraisal received by the  Company, withdrawals of such  demands, and any  other
instruments served pursuant to Delaware Law and received by the Company and (ii)
the  opportunity  to direct  all negotiations  and  proceedings with  respect to
demands for appraisal under Delaware Law. The Company shall not, except with the
prior written consent of  Parent, make any payment  with respect to any  demands
for appraisal or offer to settle or settle any such demands.
 
    SECTION  2.10.  NO  FURTHER OWNERSHIP RIGHTS  IN COMPANY COMMON  STOCK.  The
Merger Consideration  delivered upon  the surrender  for exchange  of Shares  in
accordance  with the terms  hereof shall be  deemed to have  been issued in full
satisfaction of all  rights pertaining  to such Shares,  and there  shall be  no
further registration of transfers on the records of the Surviving Corporation of
Shares which were outstanding immediately prior to the Effective Time. If, after
the  Effective Time, Certificates are presented to the Surviving Corporation for
any reason, they shall be canceled and exchanged as provided in this Article II.
 
    SECTION 2.11.   LOST, STOLEN OR  DESTROYED CERTIFICATES.   In the event  any
Certificates shall have been lost, stolen or destroyed, the Exchange Agent shall
issue  in exchange  for such  lost, stolen  or destroyed  Certificates, upon the
making of  an  affidavit  of  that  fact by  the  holder  thereof,  such  Merger
Consideration  as may be  required pursuant to  Section 2.06; provided, however,
that Parent may, in its discretion and as a condition precedent to the  issuance
and delivery thereof, require the owner of such
 
                                      A-7
<PAGE>
lost,  stolen or destroyed Certificates to deliver a  bond in such sum as it may
reasonably direct as indemnity against any claim that may be made against Parent
or the Exchange  Agent with  respect to the  Certificates alleged  to have  been
lost, stolen or destroyed.
 
    SECTION  2.12.  TAKING OF NECESSARY ACTION; FURTHER ACTION.  Each of Parent,
Merger Sub  and  the Company  in  good faith  will  take all  such  commercially
reasonable  and lawful  action as  may be necessary  or appropriate  in order to
effectuate the Merger in accordance with this Agreement as promptly as possible.
If, at any time after the Effective  Time, any such further action is  necessary
or  desirable  to carry  out  the purposes  of this  Agreement  and to  vest the
Surviving Corporation  with full  right,  title and  possession to  all  assets,
property,  rights, privileges, powers  and franchises of  the Company and Merger
Sub, the  officers  and  directors of  the  Company  and Merger  Sub  are  fully
authorized  in the name  of their respective corporations  or otherwise to take,
and will take, all such lawful and necessary action.
 
                                  ARTICLE III
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
    The Company hereby represents and warrants to Parent and Merger Sub that:
 
    SECTION 3.01.  ORGANIZATION  AND QUALIFICATION; SUBSIDIARIES.   Each of  the
Company  and its subsidiaries is a  corporation duly organized, validly existing
and in good standing under the laws of the jurisdiction of its incorporation and
has the requisite  corporate power  and authority and  is in  possession of  all
franchises,  grants,  authorizations,  licenses,  permits,  easements, consents,
certificates, approvals and  orders ("APPROVALS")  necessary to  own, lease  and
operate  the properties it purports to own, operate or lease and to carry on its
business as  it is  now  being conducted,  except where  the  failure to  be  so
organized,  existing and in good  standing or to have  such power, authority and
Approvals would not have a Material Adverse Effect. Each of the Company and  its
subsidiaries  is  duly qualified  or  licensed as  a  foreign corporation  to do
business, and is in good standing,  in each jurisdiction where the character  of
its  properties owned, leased or operated by  it or the nature of its activities
makes such qualification or licensing necessary, except for such failures to  be
so  duly  qualified or  licensed  and in  good standing  that  would not  have a
Material Adverse  Effect. A  true and  complete  list of  all of  the  Company's
subsidiaries, together with the jurisdiction of incorporation of each subsidiary
and  the percentage of each subsidiary's  outstanding capital stock owned by the
Company or  another subsidiary,  is set  forth in  Section 3.01  of the  written
disclosure  schedule previously delivered by the Company to Parent (the "COMPANY
DISCLOSURE SCHEDULE").  Except as  set  forth in  Section  3.01 of  the  Company
Disclosure  Schedule, the Company does not directly or indirectly own any equity
or similar interest  in, or  any interest  convertible into  or exchangeable  or
exercisable   for,  any  equity   or  similar  interest   in,  any  corporation,
partnership, joint venture or other business association or entity.
 
    SECTION 3.02.  CERTIFICATE  OF INCORPORATION AND BY-LAWS.   The Company  has
heretofore furnished to Parent a complete and correct copy of its Certificate of
Incorporation  and By-Laws, as  amended to date.  Within 14 days  after the date
hereof, the  Company will  provide Parent  a complete  and correct  copy of  the
equivalent   organizational  documents   of  each  of   its  subsidiaries.  Such
Certificate of Incorporation, By-Laws and equivalent organizational documents of
each of its subsidiaries  are in full  force and effect. The  Company is not  in
violation  of  any of  the  provisions of  its  Certificate of  Incorporation or
By-Laws. None  of the  Company's subsidiaries  is  in violation  of any  of  the
provisions  of  its  Certificate  of  Incorporation  or  By-Laws  or  equivalent
organizational documents, except  for any such  violations as would  not have  a
Material Adverse Effect.
 
    SECTION  3.03.  CAPITALIZATION.  The authorized capital stock of the Company
consists of 100,000,000 Shares. As of  February 22, 1996, (i) 25,624,980  Shares
were  issued and outstanding,  all of which  are validly issued,  fully paid and
nonassessable, (ii) 5,886,041 Shares were held  in the treasury of the  Company,
(iii) 5,530,573 Shares were reserved for future issuance pursuant to outstanding
Options  granted  under  the Employee  Stock  Plan, (iv)  1,622,638  Shares were
reserved for future
 
                                      A-8
<PAGE>
issuance pursuant to  future option grants  under the Employee  Stock Plan,  (v)
90,000  Shares were reserved for future issuance pursuant to outstanding Options
granted under the Directors' Plan, (vi) 107,500 Shares were reserved for  future
issuance  pursuant  to future  option grants  under  the Directors'  Plan, (vii)
663,304 Shares were reserved for future issuance pursuant to option grants under
the Company  Stock Purchase  Plan,  (viii) 1,051,282  Shares were  reserved  for
future  issuance with  respect to  the Convertible  Debentures and  (ix) 500,000
Shares  were  reserved  for  issuance  pursuant  to  the  Company's  Performance
Incentive  Plan. No change in such  capitalization has occurred between February
22, 1996 and the date hereof other than any change associated with the  exercise
of vested Options or purchases under the Company Stock Purchase Plan. Except for
the Convertible Debentures and as set forth in this Section 3.03 or Section 3.11
hereof  or in Section 3.03  or Section 3.11 of  the Company Disclosure Schedule,
there are  no options,  warrants or  other rights,  agreements, arrangements  or
commitments of any character relating to the issued or unissued capital stock of
the  Company or any of its subsidiaries or  obligating the Company or any of its
subsidiaries to issue or sell  any shares of capital  stock of, or other  equity
interests  in, the  Company or  any of its  subsidiaries. All  Shares subject to
issuance as aforesaid, upon  issuance on the terms  and conditions specified  in
the  instruments pursuant to which they  are issuable, shall be duly authorized,
validly issued, fully paid and nonassessable. Except as is set forth in  Section
3.03 of the Company Disclosure Schedule, there are no obligations, contingent or
otherwise,  of the Company or  any of its subsidiaries  to repurchase, redeem or
otherwise acquire any shares  of Company capital stock  or the capital stock  of
any  subsidiary or to provide funds to or  make any investment (in the form of a
loan, capital contribution  or otherwise) in  any such subsidiary  or any  other
entity other than guarantees of bank obligations of subsidiaries entered into in
the  ordinary course of business. All of the outstanding shares of capital stock
of each of the Company's subsidiaries are duly authorized, validly issued, fully
paid and  nonassessable,  and,  other  than directors'  or  similar  DE  MINIMIS
statutory qualifying shares, all such shares are owned by the Company or another
subsidiary  free and  clear of all  security interests,  liens, claims, pledges,
agreements, limitations  in  the  Company's  voting  rights,  charges  or  other
encumbrances of any nature whatsoever.
 
    SECTION  3.04.  AUTHORITY RELATIVE  TO THIS AGREEMENT.   (a) The Company has
all necessary  corporate  power  and  authority  to  execute  and  deliver  this
Agreement  and  to  perform  its obligations  hereunder  and  to  consummate the
transactions contemplated hereby. The execution  and delivery of this  Agreement
by  the  Company  and  the  consummation  by  the  Company  of  the transactions
contemplated hereby  have been  duly  and validly  authorized by  all  necessary
corporate  action and no other corporate proceedings  on the part of the Company
are necessary to authorize this Agreement  or to consummate the transactions  so
contemplated  (other than the approval and adoption of the Merger by the holders
of at least a  majority of the  outstanding shares of  the Company Common  Stock
entitled  to vote in accordance with  Delaware Law and the Company's Certificate
of Incorporation  and  By-Laws). The  Board  of  Directors of  the  Company  has
determined  that  it is  advisable and  in  the best  interest of  the Company's
stockholders for the Company  to enter into a  business combination with  Parent
upon  the terms and subject to the  conditions of this Agreement. This Agreement
has been duly and  validly executed and delivered  by the Company and,  assuming
the  due  authorization, execution  and delivery  by Parent  and Merger  Sub, as
applicable, constitutes the legal, valid and binding obligation of the Company.
 
    (b) The Board has taken all necessary action to amend the Rights  Agreement,
dated  as of May 15, 1989, between the Company and Norwest Bank Minnesota, N.A.,
as Rights Agent (the "RIGHTS AGREEMENT"), so  that (A) none of the execution  or
delivery  of this Agreement or the making of the Offer will cause (i) the Rights
(as defined in  the Rights  Agreement) to  become exercisable  under the  Rights
Agreement,  (ii) Parent or Merger Sub or any of their affiliates to be deemed an
"Acquiring Person" (as  defined in the  Rights Agreement) or  (iii) the  "Shares
Acquisition  Date" (as defined in  the Rights Agreement) to  occur upon any such
event, (B) none of the  acceptance for payment or  payment for Shares by  Merger
Sub  pursuant to the Offer or the consummation  of the Merger will cause (i) the
Rights to become exercisable under the  Rights Agreement, (ii) Parent or  Merger
Sub  or any of  their affiliates to be  deemed an Acquiring  Person or (iii) the
Shares Acquisition Date to occur upon any such
 
                                      A-9
<PAGE>
event, and (C) the "Expiration Date" (as defined in the Rights Agreement)  shall
occur  no later than immediately prior to the purchase of Shares pursuant to the
Offer. The "Distribution  Date" (as  defined in  the Rights  Agreement) has  not
occurred.
 
    (c)  As of the date hereof and pursuant to Section 203(a)(1) of the Delaware
Law, the restrictions contained in Section 203  of the Delaware Law are, and  at
all  times  on  or prior  to  the  Effective Time  such  restrictions  shall be,
inapplicable to the Offer, the Merger and the transactions contemplated by  this
Agreement. The Company has heretofore delivered to Parent a complete and correct
copy  of the resolutions of the Board of  Directors of the Company to the effect
that pursuant  to  Section  203(a)(1)  of the  Delaware  Law,  the  restrictions
contained  in Section 203 of  the Delaware Law are  and shall be inapplicable to
the Offer, the Merger and the transactions contemplated by this Agreement.
 
    (d) The Board  has taken all  necessary action to  amend the Cray  Research,
Inc.  Executives  Severance  Compensation  Plan,  the  Cray  Research,  Inc. Key
Management/Professional Severance Compensation Plan and the Cray Research,  Inc.
General  Employee  Severance  Compensation  Plan  (collectively,  the "PARACHUTE
PLANS") so  that  none  of  the  execution,  delivery  or  performance  of  this
Agreement,  including,  without limitation,  consummation of  the Offer  and the
Merger shall constitute a "Change of Control" for the purposes of such Parachute
Plans.
 
    SECTION 3.05.   NO CONFLICT;  REQUIRED FILINGS  AND CONSENTS.   (a)  Section
3.05(a) of the Company Disclosure Schedule includes a list as of the date hereof
(i)  all contracts of the  Company and its subsidiaries  the loss of which would
have a Material Adverse  Effect on the Company,  (ii) all contracts pursuant  to
which  the Company expects or is scheduled to receive (assuming full performance
by the Company  pursuant to  the terms thereof)  revenue of  $5,000,000 or  more
during  the eighteen (18) month period following  the date hereof, and (iii) all
agreements which, as of the date hereof, will be required to be filed, with  the
Securities  Exchange Commission (the "SEC") pursuant  to the requirements of the
Securities Exchange Act  of 1934,  as amended,  and the  SEC's rules  thereunder
(collectively,  the "EXCHANGE ACT") as "material contracts" ((i), (ii) and (iii)
being,  collectively,  the  "MATERIAL  CONTRACTS")   of  the  Company  and   its
subsidiaries).
 
    (b)  Except  as  set forth  in  Section  3.05(b) of  the  Company Disclosure
Schedule, the execution and  delivery of this Agreement  by the Company do  not,
and the performance of this Agreement by the Company will not, (i) conflict with
or   violate  the  Certificate   of  Incorporation  or   By-Laws  or  equivalent
organizational documents  of  the  Company  or any  of  its  subsidiaries,  (ii)
conflict  with or violate  any law, rule, regulation,  order, judgment or decree
applicable to the Company or any of its  subsidiaries or by which its or any  of
their  respective properties is bound or affected, or (iii) result in any breach
of or constitute a  default (or an event  that with notice or  lapse of time  or
both   would  become  a  default),  or  impair  the  Company's  or  any  of  its
subsidiaries' rights  or alter  the rights  or obligations  of any  third  party
under,  or give to others any  rights of termination, amendment, acceleration or
cancellation of, any Material Contract, or result  in the creation of a lien  or
encumbrance  on any  of the properties  or assets of  the Company or  any of its
subsidiaries  pursuant  to,  any  note,  bond,  mortgage,  indenture,  contract,
agreement,  lease, license, permit, franchise  or other instrument or obligation
to which the  Company or  any of its  subsidiaries is  a party or  by which  the
Company  or any of its subsidiaries or its or any of their respective properties
is bound or affected.
 
    (c) The execution and  delivery of this Agreement  by the Company does  not,
and  the performance  of this  Agreement by  the Company  will not,  require any
consent, approval, authorization or  permit of, or  filing with or  notification
to,  any governmental or  regulatory authority, domestic  or foreign, except (i)
for applicable requirements, if any, of  the Securities Act of 1933, as  amended
(the  "SECURITIES  ACT"), the  Exchange Act,  state  securities laws  ("BLUE SKY
LAWS"),  the  pre-merger  notification  requirements  of  the  Hart-Scott-Rodino
Antitrust  Improvements Act of 1976, as  amended (the "HSR ACT"), any non-United
States competition, antitrust and investment laws and the filing and recordation
of appropriate merger or  other documents as required  by Delaware Law and  (ii)
where the failure to obtain such consents, approvals, authorizations or permits,
or to make such filings or notifications, would not
 
                                      A-10
<PAGE>
prevent  or delay consummation of the Merger,  or otherwise prevent or delay the
Company from  performing its  obligations  under this  Agreement, or  would  not
otherwise have a Material Adverse
Effect.
 
    SECTION  3.06.   COMPLIANCE; PERMITS.   (a)  Except as  disclosed in Section
3.06(a) of the Company Disclosure Schedule,  neither the Company nor any of  its
subsidiaries  is in conflict with,  or in default or  violation of, (i) any law,
rule, regulation, order, judgment or decree applicable to the Company or any  of
its  subsidiaries or by which its or any of their respective properties is bound
or affected or (ii)  any note, bond,  mortgage, indenture, contract,  agreement,
lease, license, permit, franchise or other instrument or obligation to which the
Company  or any of its subsidiaries is a party or by which the Company or any of
its subsidiaries  or its  or any  of  their respective  properties is  bound  or
affected,  except where such conflicts, defaults and violations would not have a
Material Adverse Effect on the Company.
 
    (b) The Company and its subsidiaries hold all permits, licenses,  easements,
variances,   exemptions,  consents,  certificates,  orders  and  approvals  from
governmental authorities which are material to the operation of the business  of
the  Company and its  subsidiaries taken as a  whole (collectively, the "COMPANY
PERMITS"). The Company and its subsidiaries are in compliance with the terms  of
the  Company Permits,  except where the  failure to  so comply would  not have a
Material Adverse Effect.
 
    SECTION 3.07.  SEC FILINGS; FINANCIAL STATEMENTS.  (a) The Company has filed
all forms,  reports  and documents  required  to be  filed  with the  SEC  since
December  31, 1993 and has made available to Parent (i) its Quarterly Reports on
Form 10-Q for the  periods ended June 30  and September 30, 1995,  respectively,
(ii)  all proxy  statements relating to  the Company's  meetings of stockholders
(whether annual  or special)  held  since December  31,  1993, (iii)  all  other
reports or registration statements filed by the Company with the SEC (other than
Reports  on Form  10-Q, Reports on  Forms 3,  4 or 5  and Schedule  13G filed on
behalf of  affiliates of  the Company)  since December  31, 1993,  and (iv)  all
amendments and supplements to all such reports and registration statements filed
by  the  Company with  the SEC  (collectively, the  "COMPANY SEC  REPORTS"). The
Company SEC Reports (i) were prepared in accordance with the requirements of the
Securities Act or the Exchange Act, as the case may be, and (ii) did not at  the
time  they were filed (or if amended or superseded by a filing prior to the date
of this Agreement, then on the date of such filing) contain any untrue statement
of a  material fact  or omit  to state  a material  fact required  to be  stated
therein  or necessary in order  to make the statements  therein, in the light of
the circumstances  under which  they  were made,  not  misleading. None  of  the
Company's subsidiaries is required to file any forms, reports or other documents
with the SEC.
 
    (b)  Each of the consolidated financial statements (including, in each case,
any related notes thereto) contained in the Company SEC Reports and contained in
Section 3.09 of the Company Disclosure Schedule was prepared in accordance  with
United  States Generally  Accepted Accounting  Principles ("GAAP")  applied on a
consistent basis throughout  the periods  involved (except as  may be  indicated
therein  or in  the notes  thereto) and  each fairly  presented the consolidated
financial position of  the Company  and its  subsidiaries as  at the  respective
dates  thereof and the consolidated results of its operations and cash flows for
the periods indicated,  except that the  unaudited interim financial  statements
were  or are subject to normal and recurring year-end adjustments which were not
or are not expected to be material in amount.
 
    (c) The Company has  heretofore furnished to Parent  a complete and  correct
copy  of any amendments or modifications, which have not yet been filed with the
SEC but  which are  required to  be  filed, to  agreements, documents  or  other
instruments which previously had been filed by the Company with the SEC pursuant
to the Securities Act or the Exchange Act.
 
                                      A-11
<PAGE>
    SECTION 3.08.  ABSENCE OF CERTAIN CHANGES OR EVENTS.  Except as set forth in
Section  3.08 of  the Company Disclosure  Schedule and the  Company SEC Reports,
since December 31, 1995, the Company has conducted its business in the  ordinary
course and there has not occurred: (i) any amendments or changes in the Articles
of  Incorporation or Bylaws of  the Company; (ii) any  damage to, destruction or
loss of any assets of the Company (whether or not covered by insurance) that had
a Material Adverse  Effect; (iii) any  change by the  Company in its  accounting
methods,  principles or practices; (iv) any revaluation by the Company of any of
its assets, including, without limitation, writing down the value of capitalized
software or inventory or writing off notes or accounts receivable other than  in
the  ordinary course of business; (v) any  other action or event that would have
required the consent of Parent pursuant to Section 5.01 had such action or event
occurred after the date of this Agreement; or (vi) any sale of a material amount
of assets of  the Company,  except for  the sale  of inventory  in the  ordinary
course of business.
 
    SECTION  3.09.   NO  UNDISCLOSED  LIABILITIES.   Except  as is  disclosed in
Section 3.09 of the Company Disclosure Schedule, neither the Company nor any  of
its   subsidiaries  has  any  liabilities   (absolute,  accrued,  contingent  or
otherwise) which are, in the aggregate, material to the business, operations  or
financial condition of the Company and its subsidiaries taken as a whole, except
liabilities   (a)  adequately  provided  for  in  the  Company's  balance  sheet
(including any related  notes thereto) for  the fiscal year  ended December  31,
1995  included in  Section 3.09  of the  Company Disclosure  Schedule (the "1995
BALANCE SHEET"),  (b)  incurred in  the  ordinary  course of  business  and  not
required  under GAAP to be reflected on  the 1995 Balance Sheet, or (c) incurred
since December 31, 1995 in the  ordinary course of business and consistent  with
past practice, and liabilities incurred in connection with this Agreement.
 
    SECTION  3.10.  ABSENCE  OF LITIGATION.  Except  for routine litigation that
individually and in the aggregate if  determined adversely to the Company  would
not  result in the Company paying damages net of insurance in excess of $250,000
and except as is set forth in Section 3.10 of the Company Disclosure Schedule or
in the Company SEC Reports filed prior to the date of this Agreement, there  are
no  claims, actions,  suits, proceedings  or investigations  pending or,  to the
knowledge of  the  Company,  threatened  against  the  Company  or  any  of  its
subsidiaries,  or  any  properties  or  rights of  the  Company  or  any  of its
subsidiaries, before any  court, arbitrator or  administrative, governmental  or
regulatory authority or body, domestic or foreign.
 
    SECTION  3.11.  EMPLOYEE BENEFIT PLANS;  EMPLOYMENT AGREEMENTS.  (a) Section
3.11(a) of the Company Disclosure Schedule lists all employee benefit plans  (as
defined  in Section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA")), all other bonus, stock option, stock purchase, incentive,
deferred compensation, supplemental  retirement, severance  or termination  pay,
medical  or life insurance,  supplemental unemployment benefits, profit-sharing,
pension or  retirement  plans,  agreements or  arrangements  and  other  similar
material  fringe or  employee benefit plans,  programs or  arrangements, and any
current or former employment or executive compensation or severance  agreements,
regardless  of  whether ERISA  is  applicable thereto,  for  the benefit  of, or
relating to, any  employee or former  employee of  the Company or  any trade  or
business  (whether or not incorporated) which is  a member of a controlled group
including the Company  or which  is under common  control with  the Company  (an
"ERISA  AFFILIATE") within the meaning of Section 414 of the Code (the "EMPLOYEE
PLANS"), and a copy of each such  written Employee Plan has been made  available
to Parent (other than Foreign Employee Plans (as defined herein), which shall be
made  available  to  the  Parent  prior to  the  Effective  Time  to  the extent
practicable).
 
    (b) Except  as  set forth  in  Section  3.11(b) of  the  Company  Disclosure
Schedule, and except as any inaccuracy in the following statements, individually
or  in the aggregate, would  not have a Material  Adverse Effect on the Company,
(i) none of the Employee Plans provides retiree medical or other retiree welfare
benefits to any person and none of the Employee Plans is a "multiemployer  plan"
as  such term is defined in Section 3(37)  of ERISA; (ii) all Employee Plans are
in compliance in all material respects  with the requirements prescribed by  any
and  all  applicable statutes,  orders,  or governmental  rules  and regulations
currently   in   effect   with   respect   thereto,   and   the   Company    and
 
                                      A-12
<PAGE>
each  of its subsidiaries have performed all material obligations required to be
performed by them under,  are not in  any material respect  in default under  or
violation  of, and have  no knowledge of  any default or  violation by any other
party to,  any of  the Employee  Plans;  (iii) each  Employee Plan  intended  to
qualify  under  Section  401(a)  of  the Code  is  the  subject  of  a favorable
determination letter  from  the  IRS,  and  nothing  has  occurred  which  could
reasonably  be  expected to  impair such  determination; (iv)  all contributions
required to be made to any Employee Plan under the terms of the Employee Plan or
any collective bargaining agreement or as required by law, have been made on  or
before  their due dates and, to the extent required by GAAP, a reasonable amount
has been accrued for  contributions to each Employee  Plan for the current  plan
years; (v) none of the Employee Plans are, or are expected to become, subject to
the  provisions of Title IV of ERISA or Section 412 of the Code and (vi) neither
the Company nor  any ERISA  Affiliate has  incurred, nor  reasonably expects  to
incur,  any liability under Title IV of  ERISA (other than liability for premium
payments to the  Pension Benefit  Guaranty Corporation arising  in the  ordinary
course).
 
    (c)  To  the  knowledge  of  the  Company,  there  are  no  pending material
investigations, litigation or other enforcement actions against the Company with
respect to any of the Employee Plans.
 
    (d) Other than  as set forth  in Section 3.11(d)  of the Company  Disclosure
Schedule, there are no material actions, suits or claims pending or, to the best
knowledge  of  the Company,  threatened by  former or  present employees  of the
Company (or their beneficiaries) with respect to Employee Plans or the assets or
fiduciaries thereof (other than routine claims for benefits).
 
    (e) Other than  as described in  Section 3.11(e) of  the Company  Disclosure
Schedule,  to the knowledge of  the Company, no condition  or event has occurred
with respect to the Employee Plans which has or could reasonably be expected  to
result in a material liability to the Company.
 
    (f)  Section 3.11(f)(1) of the Company Disclosure Schedule sets forth a true
and complete list of each current or former employee, officer or director of the
Company or any of its  subsidiaries who holds an Option  as of the date  hereof,
together  with the  number of  shares of  Company Common  Stock subject  to such
Option, the date of grant of such Option, the exercise price of such Option  (to
the extent determined as of the date hereof), whether such Option is intended to
qualify  as an "incentive stock option" within  the meaning of Section 422(b) of
the Code (an "ISO"), and the expiration date of such Option. Section  3.11(f)(2)
of the Company Disclosure Schedule also sets forth the total number of Options.
 
    (g)  With respect  to each  scheme or  arrangement mandated  by a government
other than the United States (a "FOREIGN GOVERNMENT SCHEME OR ARRANGEMENT")  and
with  respect  to  each  Employee  Plan  maintained  or  contributed  to  by any
subsidiary of the Company that is not  subject to United States law (a  "FOREIGN
EMPLOYEE   PLAN"),  except  as  any  inaccuracy  in  the  following  statements,
individually or in the aggregate, would not have a Material Adverse Effect:
 
        (i) Any employer and  employee contributions required by  law or by  the
    terms  of  any  Foreign  Government Scheme  or  Arrangement  or  any Foreign
    Employee Plan have been made, or, if applicable, accrued, in accordance with
    normal accounting practices.
 
        (ii) Except as disclosed  in Section 3.11(g)  of the Company  Disclosure
    Schedule,  the  fair  market value  of  the  assets of  each  funded Foreign
    Employee Plan, the liability of each  insurer for any Foreign Employee  Plan
    funded  through insurance  or the book  reserve established  for any Foreign
    Employee Plan, together  with any  accrued contributions,  is sufficient  to
    procure  or provide for the  accrued benefit obligations, as  of the date of
    this Agreement, with respect to all current and former participants in  such
    Foreign  Employee Plan according to the actuarial assumptions and valuations
    most recently  used  to determine  employer  contributions to  such  Foreign
    Employee  Plan and no transaction contemplated by this Agreement shall cause
    such  assets  or  insurance  obligations  to  be  less  than  such   benefit
    obligations.
 
       (iii)  Each  Foreign Employee  Plan required  to  be registered  has been
    registered  and  has  been  maintained  in  good  standing  with  applicable
    regulatory authorities.
 
                                      A-13
<PAGE>
    (h)  Section 3.11(h) of the Company  Disclosure Schedule sets forth the wage
review and compensation guidelines for employees adopted by the Company in 1996.
 
    (i) The Company has  made available to Parent  (i) copies of all  employment
agreements  with officers  of the  Company; (ii)  copies of  all agreements with
consultants who  are individuals  obligating  the Company  to make  annual  cash
payments  in an amount exceeding  $100,000 and which are  not terminable on less
than 60  days' notice  without penalty;  (iii) copies  of all  plans,  programs,
agreements  and  other  arrangements of  the  Company  with or  relating  to its
employees which contain change in control provisions; and (iv) the various forms
of employment agreement, if any, of the Company for its non-executive employees.
 
    SECTION 3.12.  LABOR MATTERS.  (i) There are no controversies pending or, to
the knowledge of the Company or any of its subsidiaries, threatened, between the
Company or any of its subsidiaries and any of their respective employees,  which
controversies  are reasonably  likely to  have a  Material Adverse  Effect; (ii)
neither the Company nor  any of its  subsidiaries is a  party to any  collective
bargaining  agreement  or  other  labor  union  contract  applicable  to persons
employed by the Company or its subsidiaries  nor does the Company or any of  its
subsidiaries  know  of  any activities  or  proceedings  of any  labor  union to
organize any  such employees;  and (iii)  neither  the Company  nor any  of  its
subsidiaries  has  any  knowledge  of any  strikes,  slowdowns,  work stoppages,
lockouts, or threats thereof, by or with respect to any employees of the Company
or any of its subsidiaries.
 
    SECTION 3.13.    REGISTRATION  STATEMENT;  PROXY  STATEMENT.    Neither  the
Schedule  14D-9 nor  any of the  information supplied  or to be  supplied by the
Company in writing for inclusion or incorporation by reference in (i) the  Offer
Documents,  (ii) the Registration Statement on Form S-4 to be filed with the SEC
by Parent in connection with the issuance  of Parent Common Stock in the  Merger
(together  with any amendments thereof or supplements thereto, the "REGISTRATION
STATEMENT") or  (iii) the  proxy and/or  information statement  relating to  the
meeting  of the Company's stockholders  (the "COMPANY STOCKHOLDERS' MEETING") to
be held in connection with the Merger (the "PROXY STATEMENT" and, together  with
the  Registration  Statement,  the "PROXY  STATEMENT/PROSPECTUS")  will,  at the
respective times filed with the SEC or other regulatory agency and, in addition,
(A) in the case of  the Offer Documents, at the  date they or any amendments  or
supplements  thereto are mailed  to Stockholders, (B)  in the case  of the Proxy
Statement/Prospectus, at the date  it or any  amendments or supplements  thereto
are mailed to stockholders, at the time of the Company Stockholders' Meeting and
at the Effective Time and (C) in the case of the Registration Statement, when it
becomes  effective under the  Securities Act and at  the Effective Time, contain
any untrue statement  of a  material fact  or omit  to state  any material  fact
required  to be  stated therein  or necessary  in order  to make  the statements
therein,  in  light  of  the  circumstances  under  which  they  are  made,  not
misleading. The Proxy Statement and Schedule 14D-9 will comply as to form in all
material  respects with  the applicable provisions  of the Exchange  Act and the
rules and regulations thereunder. If at any time prior to the Effective Time any
event relating to the Company or  any of its respective affiliates, officers  or
directors  should be discovered by  the Company which should  be set forth in an
amendment or supplement to  the Registration Statement,  Offer Documents or  the
Proxy  Statement/Prospectus, the Company shall promptly inform Parent and Merger
Sub. Notwithstanding  the  foregoing, the  Company  makes no  representation  or
warranty  with respect to any information supplied by Parent or Merger Sub which
is contained in any of the foregoing documents.
 
    SECTION 3.14.    RESTRICTIONS  ON  BUSINESS ACTIVITIES.    Except  for  this
Agreement, there is no material agreement, judgment, injunction, order or decree
binding  upon  the  Company  or  any of  its  subsidiaries  which  has  or could
reasonably be expected to have (after  giving effect to the consummation of  the
Offer  and  the Merger)  the  effect of  prohibiting  or impairing  any material
business operations of the  Company or any of  its subsidiaries, acquisition  of
property by the Company or any of its subsidiaries or the conduct of business by
the  Company or any of its subsidiaries as currently conducted or as proposed to
be conducted by the Company.
 
                                      A-14
<PAGE>
    SECTION 3.15.  TITLE TO PROPERTY.  The Company and each of its  subsidiaries
have  good,  marketable and  defensible  title to  all  of their  properties and
assets, free and clear of all  liens, charges and encumbrances except liens  for
taxes not yet due and payable and such liens or other imperfections of title, if
any,  as  do not  materially detract  from the  value of  or interfere  with the
present use of the property affected thereby or which would not have a  Material
Adverse Effect on the Company.
 
    SECTION 3.16.   TAXES.  (a) For purposes of this Agreement, "TAX" or "TAXES"
shall  mean  taxes,  fees,  levies, duties,  tariffs,  imposts  and governmental
impositions or charges  of any  kind in  the nature  of (or  similar to)  taxes,
payable  to any federal,  state, provincial, local  or foreign taxing authority,
including (without limitation) (i)  income, franchise, profits, gross  receipts,
AD  VALOREM,  net worth,  value  added, sales,  use,  service, real  or personal
property, special  assessments, capital  stock, license,  payroll,  withholding,
employment,  social security, workers'  compensation, unemployment compensation,
utility, severance, production,  excise, stamp,  occupation, premiums,  windfall
profits, transfer and gains taxes and (ii) interest, penalties, additional taxes
and  additions to tax imposed with respect thereto; and "TAX RETURNS" shall mean
returns, reports and information statements with respect to Taxes required to be
filed with the United States Internal  Revenue Service (the "IRS") or any  other
taxing   authority,   domestic  or   foreign,  including,   without  limitation,
consolidated, combined and unitary tax returns.
 
    (b) Other than  as disclosed on  Section 3.16(b) of  the Company  Disclosure
Schedule,  the  Company  and each  of  its subsidiaries,  and  any consolidated,
combined, unitary or aggregate  group for Tax purposes  of which the Company  or
any  of its subsidiaries is  or has been a member,  have filed all United States
federal income Tax  Returns and all  other material Tax  Returns required to  be
filed  by them  or any  of them, and  have paid  and discharged  all Taxes shown
therein to be due and there are no other Taxes that would be due if asserted  by
a  taxing  authority,  except such  as  are  being contested  in  good  faith by
appropriate proceedings (to the extent  that any such proceedings are  required)
or  with respect to which the Company is maintaining reserves in accordance with
GAAP in  its  financial statements  to  the  extent currently  required  in  all
material  respects adequate for their payment,  except, in each instance, to the
extent the failure to  do so would  not have a Material  Adverse Effect. To  the
best  of the Company's knowledge, the Company  and each of its subsidiaries have
disclosed to the relevant taxing authority any position taken where the  failure
to make such disclosure would enable the taxing authority to subject such person
to  penalties or  additions to  Tax that would  have a  Material Adverse Effect.
Neither the IRS nor any other taxing authority or agency is now asserting or, to
the best of the Company's knowledge,  threatening to assert against the  Company
or  any of its subsidiaries  any deficiency or claim  for additional Taxes other
than additional Taxes with respect to which the Company is maintaining  reserves
in  accordance with GAAP in  its financial statements which  are in all material
respects adequate for their payment. There are no requests for information  from
the IRS or any other taxing authority or agency currently outstanding that could
have  a  Material Adverse  Effect imposed  on the  Company or  any subsidiaries.
Except as disclosed in  Section 3.16(b) of the  Company Disclosure Schedule,  no
material  Tax  Return  of either  the  Company  or any  of  its  subsidiaries is
currently being  audited by  any taxing  authority. No  material tax  claim  has
become a lien on any assets of the Company or any subsidiary thereof and neither
the Company nor any of its subsidiaries has granted any waiver of any statute of
limitations with respect to, or any extension of a period for the assessment of,
any  federal income tax (except  as disclosed in Section  3.16(b) of the Company
Disclosure Schedule) or material state corporate income or franchise tax (except
as the Company has  advised Parent's representatives).  Neither the Company  nor
any  of its subsidiaries is required to include in income (i) any material items
in respect of any change in  accounting principles or any deferred  intercompany
transactions,  or (ii) any installment sale  gain, where the inclusion in income
would result in a tax liability materially in excess of the reserves therefor.
 
    (c) The  Company  on  behalf  of itself  and  all  its  subsidiaries  hereby
represents  that,  other than  as disclosed  on Section  3.16(c) of  the Company
Disclosure Schedule, and  other than  with respect  to items  the inaccuracy  of
which would not have a Material Adverse Effect: (i) to the best of the Company's
knowledge,  neither the Company  nor any of  its subsidiaries is  a party to any
agreement, contract or
 
                                      A-15
<PAGE>
arrangement, or maintains or sponsors  any Employee Plans, that will  reasonably
be  expected to result,  separately or in  the aggregate, in  the payment of any
"excess parachute payment" within the meaning of Section 280G(b)(1) of the Code,
determined without regard to Section 280G(b)(4) of the Code; (ii) since  January
1,  1989, neither the Company nor any of its subsidiaries has been subject or is
likely to be subject to any accumulated earnings tax or personal holding company
tax; (iii) except  for its  subsidiaries organized  in Germany,  France and  the
Netherlands,  none of the  Company's foreign subsidiaries  have material "excess
passive assets" as  defined in  section 956A(c) of  the Code;  (iv) neither  the
Company  nor  any of  its  subsidiaries is  obligated  under any  agreement with
respect to industrial  development bonds  or other obligations  with respect  to
which  the  excludability from  gross  income of  the  holder for  United States
federal or  state income  tax purposes  could be  affected by  the  transactions
contemplated  hereunder; (v) neither the Company nor any of its subsidiaries has
entered into any deferred intercompany transaction within the meaning of section
1.1502-13(a)(2) of the United States  Treasury Regulations as to which  material
items  of deferred  gain or  loss has  not been  restored; and  (vi) no material
excess loss account  within the  meaning of section  1.1502-31T(a)(2)(v) of  the
United  States Treasury Regulations exists  with respect to the  stock of any of
its subsidiaries.
 
    (d) Except  as  set forth  in  Section  3.16(d) of  the  Company  Disclosure
Schedule,  no power of  attorney has been granted  by the Company  or any of its
subsidiaries with respect  to any  material matter  relating to  Taxes which  is
currently in force.
 
    (e)  Neither  the Company  nor any  of its  subsidiaries is  a party  to any
material agreement or arrangement (written or oral) providing for the allocation
or sharing of Taxes.
 
    (f) The Company and each of its subsidiaries have withheld from each payment
made to any of their respective past or present employees, officers or directors
the amount of all Taxes and  other deductions required to be withheld  therefrom
and  paid the same to the proper tax or other receiving officers within the time
required by law, except  where the failure  to do so would  not have a  Material
Adverse Effect.
 
    SECTION  3.17.  ENVIRONMENTAL MATTERS.  Except  as set forth in Section 3.17
of the Company Disclosure Schedule, and  except in all cases, in the  aggregate,
as  have not had and would not reasonably be expected to have a Material Adverse
Effect, the  Company  and  each  of  its  subsidiaries  (i)  have  obtained  all
applicable  permits, licenses and  other authorization which  are required under
federal, state  or  local  laws  relating to  pollution  or  protection  of  the
environment,  including  laws  relating to  emissions,  discharges,  releases or
threatened releases of pollutants, contaminants or hazardous or toxic  materials
or  wastes into ambient  air, surface water,  ground water or  land or otherwise
relating to the manufacture, processing, distribution, use, treatment,  storage,
disposal,  transport  or handling  of pollutants,  contaminants or  hazardous or
toxic materials  or  wastes  by  the  Company  or  its  subsidiaries  (or  their
respective  agents) (the "ENVIRONMENTAL LAWS"); (ii)  are in compliance with all
terms and conditions of such  required permits, licenses and authorization,  and
also  are in  compliance with  all other  limitations, restrictions, conditions,
standards, prohibitions,  requirements,  obligations, schedules  and  timetables
contained  in the Environmental Laws or contained in any regulation, code, plan,
order, decree, judgment, notice or demand letter issued, entered, promulgated or
approved thereunder; (iii)  as of the  date hereof,  are not aware  of nor  have
received  notice  of  any event,  condition,  circumstance,  activity, practice,
incident, action  or plan  which  is reasonably  likely  to interfere  with  the
Company's  operations, or  prevent continued  compliance with  the Environmental
Laws, or which  would reasonably be  likely to give  rise to any  common law  or
statutory  liability of, or otherwise form the  basis of any claim, action, suit
or proceeding against, the Company or any  of its subsidiaries (or any of  their
respective  agent's)  based on  or resulting  from the  manufacture, processing,
distribution, use, treatment, storage, disposal,  transport or handling, or  the
emission,   discharge  or  release  into  the  environment,  of  any  pollutant,
contaminant or hazardous  or toxic material  or waste; and  (iv) have taken  all
actions necessary under applicable requirements of federal, state or local laws,
rules  or  regulations to  register  any products  or  materials required  to be
registered by  the Company  or  its subsidiaries  (or  any of  their  respective
agents) thereunder.
 
                                      A-16
<PAGE>
    SECTION  3.18.  BROKERS.  No broker, finder or investment banker (other than
Salomon Brothers Inc)  is entitled to  any brokerage, finder's  or other fee  or
commission  in connection with  the transactions contemplated  by this Agreement
based upon arrangements made  by or on  behalf of the  Company. The Company  has
heretofore  furnished to  Parent a complete  and correct copy  of all agreements
between the Company and Salomon Brothers  Inc pursuant to which such firm  would
be entitled to any payment relating to the transactions contemplated hereunder.
 
    SECTION 3.19.   INTELLECTUAL PROPERTY.  (a) The Company owns, or is licensed
or   otherwise  possesses  legally  enforceable  rights  to  use,  all  patents,
trademarks,  trade  names,  service  marks,  copyrights  and  any   applications
therefor,  technology, know-how, computer software  programs or applications (in
both source code and  object code form) and  tangible or intangible  proprietary
information  or material that are used or proposed to be used in the business of
the Company, each  of which,  where applicable,  is to  the Company's  knowledge
valid  and subsisting. Section 3.19(a) of  the Company Disclosure Schedule lists
all current patents, registered and material unregistered trademarks and service
marks, registered  and material  unregistered copyrights,  trade names  and  any
applications  therefor owned by the  Company (the "COMPANY INTELLECTUAL PROPERTY
RIGHTS"),  and  specifies   the  jurisdictions  in   which  each  such   Company
Intellectual  Property  Right  has been  issued  or  registered or  in  which an
application for such  issuance and  registration has been  filed, including  the
respective  registration or application numbers and  the names of all registered
owners, together with a list of all of the Company's currently marketed software
products and an indication as to which,  if any, of such software products  have
been registered for copyright protection with the United States Copyright Office
and  any foreign offices  and by whom  such items have  been registered. Section
3.19(a) of the Company  Disclosure Schedule (as supplemented  during the 14  day
period  following  the date  hereof)  includes and  specifically  identifies all
material  third-party  patents,  trademarks  or  copyrights  (the  "THIRD  PARTY
INTELLECTUAL  PROPERTY  RIGHTS"), to  the knowledge  of  the Company,  which are
incorporated in, are, or form a part of, any Company product. Section 3.19(a) of
the Company  Disclosure  Schedule (as  supplemented  during the  14  day  period
following  the date hereof (in the case of clause (iii))) lists (i) any requests
the Company has received since December 31, 1993 to make any such  registration,
including  the  identity  of the  requestor  and  the item  requested  to  be so
registered, and the  jurisdiction for  which such  request has  been made;  (ii)
except  for object  code and  source code  license agreements  for the Company's
products executed in the ordinary course of business and in accordance with  the
Company's   past  practices,  all  material   licenses,  sublicenses  and  other
agreements as to which the Company is  a party and pursuant to which any  person
is  authorized  to use  any Company  Intellectual Property  Right, or  any trade
secret material to the Company; and (iii) all material licenses, sublicenses and
other agreements as to which  the Company is a party  and pursuant to which  the
Company  is authorized to  use any Third Party  Intellectual Property Rights, or
other trade secret  of a  third party  in or as  any product,  and includes  the
identity  of all parties thereto, a description of the nature and subject matter
thereof, the applicable royalty and the term thereof.
 
    (b) Except  as  set forth  in  Section  3.19(b) of  the  Company  Disclosure
Schedule,  the Company is not, nor  will it be as a  result of the execution and
delivery of this Agreement or the  performance of its obligations hereunder,  in
violation of any Third Party Intellectual Property Rights license, sublicense or
agreement  described in Section  3.19(a) of the  Company Disclosure Schedule. No
claims with  respect to  the  Company Intellectual  Property Rights,  any  trade
secret  material to the Company, or  Third Party Intellectual Property Rights to
the extent arising out  of any use, reproduction  or distribution of such  Third
Party  Intellectual Property  Rights by  or through  the Company,  are currently
pending or, to the knowledge of the Company, are threatened by any person,  nor,
to  the Company's knowledge, do any valid grounds for any bona fide claims exist
(i) to the effect that the manufacture, sale, licensing or use of any product as
now used, sold or licensed or proposed  for use, sale or license by the  Company
infringes  on any  copyright, patent, trademark,  service mark  or trade secret;
(ii) against  the use  by the  Company  of any  trademarks, trade  names,  trade
secrets, copyrights, patents, technology, know-how or computer software programs
and  applications used  in the Company's  business as currently  conducted or as
proposed to  be  conducted by  the  Company; (iii)  challenging  the  ownership,
validity  or effectiveness of any of the Company Intellectual Property Rights or
other trade secret material to the
 
                                      A-17
<PAGE>
Company; or (iv) challenging the Company's license or legally enforceable  right
to  use of the Third  Party Intellectual Rights. Except  as set forth in Section
3.19(b) of the Company Disclosure Schedule, to the Company's knowledge, there is
no material unauthorized  use, infringement  or misappropriation of  any of  the
Company Intellectual Property by any third party. Except as set forth in Section
3.19(b)  of the Company Disclosure Schedule, neither  the Company nor any of its
subsidiaries (i) has  been sued  or charged  in writing  as a  defendant in  any
claim,  suit, action  or proceeding  which involves  a claim  or infringement of
trade secrets, any patents, trademarks,  service marks, maskworks or  copyrights
and  which has  not been  finally terminated  prior to  the date  hereof or been
informed or notified by any third party that the Company may be engaged in  such
infringement  or (ii) has  knowledge of any  infringement liability with respect
to, or infringement  by, the Company  or any  of its subsidiaries  of any  trade
secret, patent, trademark, service mark, maskwork or copyright of another.
 
    (c)   Substantially   all  employees   of  the   Company  have   executed  a
confidentiality and invention agreement  containing terms substantially  similar
to the form previously delivered to Parent.
 
    SECTION  3.20.  VOTE  REQUIRED.  The  affirmative vote of  the holders of at
least a majority of the  outstanding shares of the  Company Common Stock is  the
only  vote of the holders of any class  or series of the Company's capital stock
necessary to approve the Merger.
 
    SECTION 3.21.  OPINION OF FINANCIAL  ADVISOR.  The Company has been  advised
by  its financial advisor, Salomon Brothers Inc,  that in its opinion, as of the
date hereof, the consideration to be  received by holders of the Company  Common
Stock in the Offer and the Merger is fair from a financial point of view to such
holders, and has delivered a written copy of such opinion to Parent.
 
    SECTION  3.22.  FULL DISCLOSURE.   No statement contained in any certificate
or schedule furnished or to be furnished  by the Company or its subsidiaries  to
Parent  or  Merger Sub  in, or  pursuant  to the  provisions of,  this Agreement
contains or shall contain any  untrue statement of a  material fact or omits  or
will   omit  to  state  any  material  fact  necessary,  in  the  light  of  the
circumstances under which it was made, to make the statements herein or  therein
not misleading.
 
                                   ARTICLE IV
            REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB
 
    Parent  and Merger Sub hereby, jointly  and severally, represent and warrant
to the Company that:
 
    SECTION 4.01.  ORGANIZATION AND QUALIFICATION.   Each of Parent and each  of
its  subsidiaries is a corporation duly  organized, validly existing and in good
standing under the  laws of the  jurisdiction of its  incorporation and has  the
requisite  corporate power and  authority and is in  possession of all Approvals
necessary to own, lease and operate  the properties it purports to own,  operate
or lease and to carry on its business as it is now being conducted, except where
the  failure to be so  organized, existing and in good  standing or to have such
power, authority and Approvals would not have a Material Adverse Effect. Each of
Parent and each of its subsidiaries is  duly qualified or licensed as a  foreign
corporation  to do business, and is in good standing, in each jurisdiction where
the character of its properties owned, leased or operated by it or the nature of
its activities makes such qualification or licensing necessary, except for  such
failures to be so duly qualified or licensed and in good standing that would not
have a Material Adverse Effect.
 
    SECTION  4.02.  AUTHORITY  RELATIVE TO THIS  AGREEMENT.  Each  of Parent and
Merger Sub  has all  necessary  corporate power  and  authority to  execute  and
deliver  this  Agreement  and  to  perform  its  obligations  hereunder  and  to
consummate the transactions contemplated hereby.  The execution and delivery  of
this  Agreement by  Parent and  Merger Sub  and the  consummation by  Parent and
Merger Sub of the  transactions contemplated hereby have  been duly and  validly
authorized  by all necessary corporate  action on the part  of Parent and Merger
Sub, and no other corporate proceedings on the part of Parent or Merger Sub  are
necessary  to  authorize this  Agreement or  to  consummate the  transactions so
contemplated. The Boards of Directors of  Parent and Merger Sub have  determined
that  it is advisable and in the  best interest of their respective stockholders
for each to enter into a business
 
                                      A-18
<PAGE>
combination with the  Company upon the  terms and subject  to the conditions  of
this  Agreement. This Agreement has been duly and validly executed and delivered
by Parent and  Merger Sub  and, assuming  the due  authorization, execution  and
delivery  by the Company,  constitutes a legal, valid  and binding obligation of
Parent and Merger Sub.
 
    SECTION 4.03.   NO CONFLICT;  REQUIRED FILINGS  AND CONSENTS.   (a)  Section
4.03(a)  of the written  disclosure schedule previously  delivered by Parent and
Merger Sub to the Company (the "PARENT DISCLOSURE SCHEDULE") includes a list  of
all contracts material to the business of Parent and its subsidiaries taken on a
whole ("PARENT MATERIAL CONTRACT").
 
    (b)  Except  as  set  forth  in Section  4.03(b)  of  the  Parent Disclosure
Schedule, the execution and delivery of this Agreement by Parent and Merger  Sub
do  not, and the  performance of this  Agreement by Parent  and Merger Sub shall
not, (i) conflict with or violate the Certificate of Incorporation or By-Laws of
Parent or the Articles of Incorporation or By-Laws of Merger Sub, (ii)  conflict
with  or violate any law, rule, regulation, order, judgment or decree applicable
to Parent  or  any of  it  subsidiaries or  by  which its  or  their  respective
properties are bound or affected, or (iii) result in any breach of or constitute
a default (or an event which with notice or lapse of time or both would become a
default)  under, or impair Parent's or any  of its subsidiaries' rights or alter
the rights or obligations of any third party under, or give to others any rights
of termination, amendment, acceleration or cancellation of, any Parent  Material
Contract  or result  in the  creation of  a lien  or encumbrance  on any  of the
properties or  assets of  Parent or  any  of it  subsidiaries pursuant  to,  any
material  note, bond, mortgage, indenture,  contract, agreement, lease, license,
permit, franchise or other  instrument or obligation to  which Parent or any  of
its subsidiaries is a party or by which Parent or any of its subsidiaries or its
or  any of their respective properties are bound or affected, except in any such
case for any such breaches, defaults or other occurrences that would not have  a
Material Adverse Effect.
 
    (c)  The execution and delivery  of this Agreement by  Parent and Merger Sub
will not require any  consent, approval, authorization or  permit of, or  filing
with  or notification to, any governmental  or regulatory authority, domestic or
foreign, except (i) for applicable requirements, if any, of the Securities  Act,
the Exchange Act, the Blue Sky Laws and the pre-merger notification requirements
of  the HSR Act, and (ii) where  the failure to obtain such consents, approvals,
authorizations or permits, or to make  such filings or notifications, would  not
prevent  or delay  consummation of  the Merger,  or otherwise  prevent Parent or
Merger Sub from  performing their respective  obligations under this  Agreement,
and would not have a Material Adverse Effect.
 
    SECTION  4.04.    CERTIFICATE  OF INCORPORATION  AND  BY-LAWS.    Parent has
heretofore furnished  to  the  Company  a  complete  and  correct  copy  of  its
Certificate  of  Incorporation  and  the  By-Laws,  as  amended  to  date.  Such
Certificate of Incorporation and By-Laws are  in full force and effect.  Neither
Parent  nor  Merger  Sub  is  in  violation of  any  of  the  provisions  of its
Certificate of Incorporation or By-Laws.
 
    SECTION 4.05.   CAPITALIZATION.   As  of January  31, 1996,  the  authorized
capital  stock of  Parent consisted of  (i) 500,000,000 shares  of Parent Common
Stock of which: 162,025,947 shares  were issued and outstanding, 342,489  shares
were  held by subsidiaries of the Company  or in its treasury, 38,459,745 shares
were reserved for issuance pursuant to option grants under Parent's stock option
plans, 1,774,574 were  reserved for  future issuance pursuant  to option  grants
under  Parent's employee stock  purchase plan, 589,266  were reserved for future
issue on exchange of shares issued by a subsidiary, 619,469 shares were reserved
for future issuance with  respect to Parent's  outstanding Series A  Convertible
Preferred  Stock, 7,402,395  shares were reserved  for issuance  with respect to
Zero Coupon Convertible Subordinated Debentures due 2013 and 49,659 shares  were
reserved  for issuance with respect to  a convertible debenture due November 11,
1997; and  (ii) 2,000,000  shares  of Preferred  Stock,  no par  value  ("PARENT
PREFERRED  STOCK"), of  which: 17,500 shares  of Series  A Convertible Preferred
Stock and one share of Series E Preferred Stock were issued and outstanding.  No
material change in such capitalization has occurred between January 31, 1996 and
the  date hereof. The authorized  capital stock of Merger  Sub consists of 1,000
shares of common stock, no par value, 100
 
                                      A-19
<PAGE>
shares of which, as of the date  hereof, are issued and outstanding. All of  the
outstanding  shares of Parent's  and Merger Sub's  respective capital stock have
been duly authorized and  validly issued and are  fully paid and  nonassessable.
The  issuance of shares  of Parent Common  Stock in connection  with the Merger,
upon exercise  of  Options  assumed  and  upon  conversion  of  the  Convertible
Debentures  have been duly  authorized, and, when issued  in connection with the
Merger or upon such exercise or  conversion, will be validly issued, fully  paid
and nonassessable.
 
    SECTION  4.06.   COMPLIANCE; PERMITS.   (a) Neither  Parent, nor  any of its
subsidiaries is in conflict with,  or in default or  violation of, (i) any  law,
rule,  regulation, order, judgment or decree applicable  to Parent or any of its
subsidiaries or by which its or any  of their respective properties is bound  or
affected  or  (ii) any  note,  bond, mortgage,  indenture,  contract, agreement,
lease, license, permit,  franchise or  other instrument or  obligation to  which
Parent  or any of its subsidiaries  is a party or by  which Parent or any of its
subsidiaries or is or any of  their respective properties is bound or  affected,
except  for any such  conflicts, defaults or  violations which would  not have a
Material Adverse Effect.
 
    (b) Parent  and  its subsidiaries  hold  all permits,  licenses,  easements,
variances,   exemptions,  consents,  certificates,  orders  and  approvals  from
governmental authorities which are material to the operation of the business  of
the  Company and its subsidiaries taken as a  whole as it is now being conducted
(collectively, the  "PARENT  PERMITS").  Parent  and  its  subsidiaries  are  in
compliance  with the terms of the Parent Permits, except where the failure to so
comply would not have a Material Adverse Effect.
 
    SECTION 4.07.  SEC FILINGS; FINANCIAL STATEMENTS.  (a) Parent has filed  all
forms,  reports and documents required  to be filed with  the SEC since June 30,
1993, and has heretofore delivered  to the Company, in  the form filed with  the
SEC,  (i) its Annual Report on Form 10-K for the fiscal year ended June 30, 1995
and its Quarterly Reports on Form  10-Q for the fiscal quarters ended  September
30,  1995 and December 31, 1995, (ii)  all proxy statements relating to Parent's
meetings of stockholders (whether annual or  special) held since June 30,  1995,
(iii)  all other reports or registration  statements (other than Reports on Form
10-Q and Reports on Form 3, 4 or 5 filed on behalf of affiliates of the  Parent)
filed  by Parent with  the SEC since June  30, 1995 and  (iv) all amendments and
supplements to all such reports and registration statements filed by Parent with
the SEC (collectively,  the "PARENT SEC  REPORTS"). The Parent  SEC Reports  (i)
were  prepared in accordance with the requirements  of the Securities Act or the
Exchange Act, as the case may be, and  (ii) did not at the time they were  filed
(or  if amended or superseded  by a filing prior to  the date of this Agreement,
then on the date of such filing) contain any untrue statement of a material fact
or omit to state a material fact  required to be stated therein or necessary  in
order  to make the statements  therein, in the light  of the circumstances under
which they were made, not misleading. None of Parent's subsidiaries is  required
to file any forms, reports or other documents with the SEC.
 
    (b)  Each of the consolidated financial statements (including, in each case,
any related notes thereto) contained in the Parent SEC Reports has been prepared
in accordance with  GAAP applied on  a consistent basis  throughout the  periods
involved  (except as  may be  indicated in  the notes  thereto) and  each fairly
presents the consolidated financial position  of Parent and its subsidiaries  as
at  the respective dates thereof and  the consolidated results of its operations
and cash flows  for the  periods indicated,  except that  the unaudited  interim
financial  statements  were  or are  subject  to normal  and  recurring year-end
adjustments which were not or are not expected to be material in amount.
 
    (c) Parent has heretofore  furnished to the Company  a complete and  correct
copy  of any amendments or modifications, which have not yet been filed with the
SEC but  which are  required to  be  filed, to  agreements, documents  or  other
instruments  which previously had been filed by  Parent with the SEC pursuant to
the Securities Act or the Exchange Act.
 
                                      A-20
<PAGE>
    SECTION 4.08.  ABSENCE OF CERTAIN CHANGES OR EVENTS.  Except as set forth on
Section 4.08 of the Parent Disclosure Schedule or the Parent SEC Reports,  since
June  30, 1995,  Parent has  conducted its business  in the  ordinary course and
there has not occurred: (i) any Material Adverse Effect; (ii) any amendments  or
changes  in the  Certificate of  Incorporation or  By-Laws of  Parent; (iii) any
damage to, destruction  or loss  of any  assets of  the Parent  (whether or  not
covered  by  insurance) that  could  have a  Material  Adverse Effect;  (iv) any
revaluation by  Parent of  any  of its  assets, including,  without  limitation,
writing down the value of capitalized software or inventory or writing off notes
or accounts receivable other than in the ordinary course of business; (v) except
as disclosed in Section 4.08 of the Parent Disclosure Schedule, any other action
or event that would have required the consent of the Company pursuant to Section
5.03 had such action or event occurred after the date of this Agreement; or (vi)
any sale of a material amount of assets of Parent, except in the ordinary course
of business.
 
    SECTION  4.09.    RESTRICTIONS  ON BUSINESS  ACTIVITIES.    Except  for this
Agreement, there is no material agreement, judgment, injunction, order or decree
binding upon Parent or any of its subsidiaries which has or could reasonably  be
expected  to have the effect of prohibiting or materially impairing any business
practice of Parent or  any of its subsidiaries,  any acquisition of property  by
Parent or any of its subsidiaries or the conduct of business by Parent or any of
its  subsidiaries  as currently  conducted  or as  proposed  to be  conducted by
Parent.
 
    SECTION 4.10.  TITLE TO PROPERTY.  Except as is disclosed in the Parent  SEC
Reports,  Parent  and  each  of  its  subsidiaries  have  good,  marketable  and
defensible title to all of  their properties and assets,  free and clear of  all
liens,  charges and encumbrances except liens for  taxes not yet due and payable
and such liens or  other imperfections of  title, if any,  as do not  materially
detract  from the  value of or  interfere with  the present use  of the property
affected thereby or which would not have a Material Adverse Effect. Except as is
disclosed in the Parent  SEC Reports, Parent owns,  or is licensed or  otherwise
possesses  legally  enforceable rights  to use,  all patents,  trademarks, trade
names, service  marks, copyrights  and  any applications  therefor,  technology,
know-how,  computer software programs  or applications (in  both source code and
object code form) and tangible or intangible proprietary information or material
that are used or proposed to be used  in the business of Parent, each of  which,
where applicable, is to Parent's knowledge valid and subsisting.
 
    SECTION  4.11.   NO  UNDISCLOSED  LIABILITIES.   Except  as is  disclosed in
Section 4.11  of the  Parent  Disclosure Schedule  or  the Parent  SEC  Reports,
neither  Parent  nor  any of  its  subsidiaries has  any  liabilities (absolute,
accrued, contingent or otherwise) which are,  in the aggregate, material to  the
business, operations or financial condition of Parent and its subsidiaries taken
as  a whole, except liabilities (a)  adequately provided for in Parent's balance
sheet (including any related notes thereto) as of June 30, 1995 included in  the
Parent  SEC Reports (the "JUNE 30 BALANCE  SHEET"), (b) incurred in the ordinary
course of business and not  required under GAAP to be  reflected on the June  30
Balance  Sheet, or (c)  incurred since June  30, 1995 in  the ordinary course of
business  and  consistent  with  past  practice,  and  liabilities  incurred  in
connection with this Agreement.
 
    SECTION  4.12.  ABSENCE OF LITIGATION.   Except as set forth in Section 4.12
of the Parent  Disclosure Schedule or  as reflected in  the Parent SEC  Reports,
there  are no claims, actions, suits,  proceedings or investigations pending or,
to  the  knowledge  of  Parent,  threatened   against  Parent  or  any  of   its
subsidiaries,  or any properties or rights of Parent or any of its subsidiaries,
before any  court,  arbitrator  or administrative,  governmental  or  regulatory
authority  or  body, domestic  or foreign,  that could  have a  Material Adverse
Effect.
 
    SECTION 4.13.  REGISTRATION STATEMENT; PROXY STATEMENT/PROSPECTUS.   Subject
to  the accuracy of the representations of  the Company in Section 3.13, neither
(i) the Offer Documents, at the time the Offer Documents are filed with the  SEC
or  are first published,  sent or given  to stockholders of  the Company, as the
case may be, nor  (ii) the Registration Statement  pursuant to which the  Parent
Common Shares to be issued in the Merger will be registered with the SEC, at the
time  the  Registration  Statement  (including  any  amendments  or  supplements
thereto) is declared effective by the SEC, shall contain any untrue statement of
a  material   fact  or   omit  to   state  any   material  fact   necessary   in
 
                                      A-21
<PAGE>
order  to make  the statements included  therein, in light  of the circumstances
under which  they were  made, not  misleading. Subject  to the  accuracy of  the
representations  of the  Company in  Section 3.13,  the information  supplied by
Parent for inclusion in the Proxy Statement/Prospectus will not, on the date the
Proxy Statement/Prospectus is first mailed to  stockholders, at the time of  the
Company  Stockholders' Meeting and at the  Effective Time, contain any statement
which, at such time and  in light of the circumstances  under which it shall  be
made,  is false or misleading with respect to any material fact, or will omit to
state any material fact  necessary in order to  make the statements therein  not
false  or  misleading. If  at any  time prior  to the  Effective Time  any event
relating to Parent, Merger Sub or  any of their respective affiliates,  officers
or  directors should be discovered  by Parent or Merger  Sub which should be set
forth in an amendment to the Registration Statement or a supplement to the Proxy
Statement/Prospectus, Parent or  Merger Sub  will promptly  inform the  Company.
Notwithstanding  the foregoing, Parent makes  no representation or warranty with
respect to any  information supplied by  the Company which  is contained in,  or
furnished in connection with the preparation of, any of the foregoing. The Offer
Documents  and the Registration Statement shall  comply in all material respects
as to form with  the requirements of  the Exchange Act  and the Securities  Act,
respectively, and the rules and regulations thereunder.
 
    SECTION  4.14.  BROKERS.  No broker, finder or investment banker (other than
Unterberg Harris L.P.) is  entitled to any brokerage,  finder's or other fee  or
commission  in connection with  the transactions contemplated  by this Agreement
based upon arrangements made by or on behalf of Parent or Merger Sub.
 
    SECTION 4.15.  NO STOCKHOLDER VOTE.   No vote of the stockholders of  Parent
is necessary to approve the Offer or the Merger or the issuance of Parent Common
Shares therein.
 
    SECTION  4.16.  FINANCING.   Parent has,  or will have,  sufficient funds to
permit Merger Sub to acquire Shares pursuant to the Offer and the Merger.
 
    SECTION 4.17.  FULL DISCLOSURE.   No statement contained in any  certificate
or  schedule furnished or to be furnished by Parent or Merger Sub to the Company
in, or pursuant to  the provisions of, this  Agreement contains or will  contain
any  untrue statement  of a material  fact or omits  or shall omit  to state any
material fact necessary, in  the light of the  circumstances under which it  was
made, to make the statements herein or therein not misleading.
 
                                   ARTICLE V
                     CONDUCT OF BUSINESS PENDING THE MERGER
 
    SECTION   5.01.     CONDUCT  OF   BUSINESS  BY   THE  COMPANY   PENDING  THE
MERGER.  Except as may be otherwise expressly indicated as permitted in  Section
5.01 of the Company Disclosure Schedule, during the period from the date of this
Agreement  and continuing until the earlier of the termination of this Agreement
or the Effective  Time, the  Company covenants  and agrees  that, unless  Parent
shall  otherwise agree  in writing, the  Company shall conduct  its business and
shall cause the businesses of its subsidiaries to be conducted only in, and  the
Company  and its subsidiaries shall  not take any action  except in the ordinary
course of  business and  in a  manner  consistent with  past practice;  and  the
Company shall use reasonable commercial efforts to preserve substantially intact
the business organization of the Company and its subsidiaries, to keep available
the  services of the present officers,  employees and consultants of the Company
and its subsidiaries,  to take all  reasonable action necessary  to prevent  the
loss,  cancellation,  abandonment,  forfeiture  or  expiration  of  any  Company
Intellectual Property, Third  Party Intellectual Property  Rights, and  Material
Contracts  and  to preserve  the present  relationships of  the Company  and its
subsidiaries with customers, suppliers and other persons with which the  Company
or  any  of  its subsidiaries  has  significant  business relations.  By  way of
amplification and not limitation, except  as contemplated by this Agreement  and
Section  5.01 of the Company Disclosure Schedule, neither the Company nor any of
its subsidiaries shall, during the
 
                                      A-22
<PAGE>
period from the date of this Agreement  and continuing until the earlier of  the
termination  of this Agreement or the Effective Time, directly or indirectly do,
or propose to  do, any of  the following  without the prior  written consent  of
Parent:
 
        (a) amend or otherwise change the Company's Certificate of Incorporation
    or By-Laws;
 
        (b)  issue,  sell,  pledge, dispose  of  or encumber,  or  authorize the
    issuance, sale, pledge, disposition or encumbrance of, any shares of capital
    stock of  any class,  or any  options, warrants,  convertible securities  or
    other  rights of  any kind to  acquire any  shares of capital  stock, or any
    other  ownership  interest  (including,  without  limitation,  any   phantom
    interest)  of the Company, any of its subsidiaries or affiliates (except for
    the issuance of shares of the Company Common Stock issuable pursuant to  the
    exercise  of Options  under the  Stock Option  Plans (as  defined in Section
    2.06(c)) or pursuant  to rights to  purchase such shares  under the  Company
    Stock  Purchase  Plan  (as defined  in  Section 2.06(c)),  which  Options or
    rights, as the  case may  be, are  outstanding on  the date  hereof or  with
    respect to the Convertible Debentures);
 
        (c)  sell, pledge, dispose of  or encumber any assets  of the Company or
    any of its  subsidiaries (except  for (i) sales  of assets  in the  ordinary
    course  of business and in  a manner consistent with  past practice on which
    individually and  in  the  aggregate  do  not  exceed  $1,000,000  and  (ii)
    dispositions of obsolete or worthless assets);
 
        (d) amend or change the period (or permit any acceleration, amendment or
    change)  of exercisability of Options or  restricted stock granted under the
    Stock Option  Plans or  authorize cash  payments in  exchange for  any  such
    Options or restricted stock;
 
        (e)  (i)  declare,  set  aside,  make  or  pay  any  dividend  or  other
    distribution (whether in cash, stock or property or any combination thereof)
    in respect  of  any  of  its  capital stock,  except  that  a  wholly  owned
    subsidiary of the Company may declare and pay a dividend to its parent, (ii)
    split,  combine or reclassify any of its capital stock or issue or authorize
    or propose the issuance of any other securities in respect of, in lieu of or
    in substitution for shares of its capital stock or (iii) amend the terms of,
    repurchase, redeem  or  otherwise  acquire,  or  permit  any  subsidiary  to
    repurchase,  redeem  or  otherwise acquire,  any  of its  securities  or any
    securities of its subsidiaries, or propose to do any of the foregoing;
 
        (f) sell,  transfer, license,  sublicense or  otherwise dispose  of  any
    Company  Intellectual  Property  (other  than  in  the  ordinary  course  of
    business, consistent with  past practice, in  connection with systems  sales
    and software developer programs), or amend or modify any existing agreements
    with   respect  to  any   Company  Intellectual  Property   or  Third  Party
    Intellectual Property Rights;
 
        (g) (i) acquire (by  merger, consolidation, or  acquisition of stock  or
    assets)  any  corporation,  partnership or  other  business  organization or
    division thereof; (ii) incur  any indebtedness for  borrowed money or  issue
    any  debt  securities or  assume, guarantee  or endorse  or otherwise  as an
    accommodation become responsible for, the obligations of any person, or make
    any loans or advances except to employees in the ordinary course  consistent
    with  past practice;  (iii) enter  into or  amend any  contract or agreement
    other than in the  ordinary course of business;  (iv) authorize or make  any
    capital  expenditures  or  purchase  of  fixed  assets  which  are,  in  the
    aggregate, in  excess of  the amount  specified in  Section 3.08(g)  of  the
    Company Disclosure Schedule for the Company and its subsidiaries, taken as a
    whole; PROVIDED, HOWEVER, that no more than one half of such amount shall be
    made or firmly committed prior to June 30, 1996, and, PROVIDED, FURTHER that
    the  Company  will  give Parent  prior  notice  of the  making  or  the firm
    commitment of more than  $5 million of capital  expenditure in any  calendar
    quarter;  (v) terminate any  Material Contract or amend  any of its material
    terms (other than  amendments to  existing credit  arrangements designed  to
    remedy  defaults  thereunder); or  (vi) enter  into  or amend  any contract,
    agreement, commitment or arrangement to effect any of the matters prohibited
    by this Section 5.01(g);
 
                                      A-23
<PAGE>
        (h) increase  the  compensation payable  or  to become  payable  to  its
    officers  or employees,  or grant  any severance  or termination  pay to, or
    enter into any employment or severance agreement with any director,  officer
    or  other  employee of  the Company  or  any of  its subsidiaries  except in
    accordance with  the  policies  and  procedures described  in  ANNEX  B,  or
    establish,  adopt,  enter  into  or  amend  any  Employee  Plan  (other than
    amendments required pursuant to Section 6.06);
 
        (i) take  any  action,  other  than  as  required  by  GAAP,  to  change
    accounting policies or procedures or cash maintenance policies or procedures
    (including,   without  limitation,   procedures  with   respect  to  revenue
    recognition, capitalization  of  development  costs,  payments  of  accounts
    payable and collection of accounts receivable);
 
        (j)   make any material Tax election inconsistent with past practices or
    settle or  compromise any  material  federal, state,  local or  foreign  tax
    liability  or agree  to an  extension of  a statute  of limitations  for any
    assessment of  federal income  tax  or material  state corporate  income  or
    franchise  tax, except to the  extent the amount of  any such settlement has
    been reserved for on the Company's most recent SEC Report;
 
        (k) pay, discharge, settle, or satisfy any lawsuits, claims, liabilities
    or obligations  (absolute, accrued,  asserted or  unasserted, contingent  or
    otherwise),  other  than  the  payment,  discharge  or  satisfaction  in the
    ordinary course of business and consistent with past practice of liabilities
    reflected or reserved against in the financial statements of the Company  or
    incurred  in  the  ordinary  course of  business  and  consistent  with past
    practice;
 
        (l) except as may be  required by law, take  any action to terminate  or
    amend  any Employee Plan (other than amendments required pursuant to Section
    6.06);
 
        (m) permit  any increase  in  the number  of  employees of  the  Company
    employed  by  the Company  on  the date  hereof  other than  pursuant  to an
    employee plan to  be agreed  to by  the Company  and Parent  as promptly  as
    practicable after the date hereof acting reasonably and in good faith; or
 
        (n)  take, or agree in writing or  otherwise to take, any of the actions
    described in Sections 5.01(a) through (m)  above, or any action which  would
    make  any of the  representations or warranties of  the Company contained in
    this Agreement untrue or incorrect or prevent the Company from performing or
    cause the Company not to perform its covenants hereunder or result in any of
    the conditions to the Merger set forth herein not being satisfied.
 
    SECTION 5.02.   NO SOLICITATION.   (a) The  Company shall  not, directly  or
indirectly,  through any officer, director, employee, representative or agent of
the Company or any of its  subsidiaries, solicit or encourage (including by  way
of  furnishing  information)  the  initiation  of  any  inquiries  or  proposals
regarding any merger, take-over bid, sale of substantial assets, sale of  shares
of  capital stock (including without  limitation by way of  a tender or exchange
offer) or similar transactions involving the Company or any subsidiaries of  the
Company (any of the foregoing inquiries or proposals being referred to herein as
an  "ACQUISITION PROPOSAL"); PROVIDED,  HOWEVER, that nothing  contained in this
Agreement shall prevent the Board from  referring any third party that  contacts
the  Company  on  an  unsolicited  basis after  the  date  hereof  concerning an
Alternative Transaction (as defined in Section 8.03(c)) to this Section  5.02(a)
(provided  that Parent is  concurrently notified of  such contact and referral).
Nothing contained  in  this Section  5.02(a)  or  any other  provision  of  this
Agreement shall prevent the Board, after receiving an opinion of outside counsel
to the effect that the Board is required to do so in order to discharge properly
its  fiduciary duties, from considering, negotiating, approving and recommending
to the stockholders of the Company an unsolicited bona fide written  Acquisition
Proposal  which the Board of  Directors of the Company  determines in good faith
(after  consultation  with  its  financial  advisors)  (i)  would  result  in  a
transaction  more favorable to  the Company's stockholders  than the transaction
contemplated by this Agreement and (ii) is made by a person financially  capable
of  consummating such Acquisition Proposal  (any such Acquisition Proposal being
referred to herein as a "SUPERIOR PROPOSAL").
 
                                      A-24
<PAGE>
    (b) The  Company  shall  immediately  notify Parent  after  receipt  of  any
Acquisition  Proposal or any  request for nonpublic  information relating to the
Company or any of its subsidiaries in connection with an Acquisition Proposal or
for access to the properties, books or records of the Company or any  subsidiary
by any person or entity that informs the Board that it is considering making, or
has  made, an Acquisition Proposal.  Such notice to Parent  shall be made orally
and in  writing and  shall indicate  in reasonable  detail the  identity of  the
offeror and the terms and conditions of such proposal, inquiry or contact.
 
    (c)  If the Board receives a request for material nonpublic information by a
party who makes a bone fide  Acquisition Proposal and the Board determines  that
such  proposal, if  consummated pursuant  to its  terms is  a Superior Proposal,
then, and only  in such case,  the Company may,  subject to the  execution of  a
confidentiality  agreement substantially similar to  that then in effect between
the Company and Parent, provide such party with access to information  regarding
the Company.
 
    (d)  The  Company shall  immediately cease  and cause  to be  terminated any
existing discussions or  negotiations with  any parties (other  than Parent  and
Merger  Sub)  conducted heretofore  with respect  to any  of the  foregoing. The
Company agrees  not to  release  any third  party  from any  confidentiality  or
standstill agreement to which the Company is a party.
 
    (e)  The Company shall ensure that  the officers, directors and employees of
the Company and its subsidiaries and  any investment banker or other advisor  or
representative  retained by the Company are  aware of the restrictions described
in this Section; and shall be responsible for any breach of this Section 5.02 by
such bankers, advisors and representatives (PROVIDED, HOWEVER, that the  Company
shall  not  be  liable  for  any  consequential  damages  with  respect  to such
breaches).
 
    SECTION 5.03.  CONDUCT OF BUSINESS BY PARENT PENDING THE MERGER.  During the
period from the date of this Agreement  and continuing until the earlier of  the
termination of this Agreement or the Effective Time, Parent covenants and agrees
that,  unless the Company shall otherwise agree in writing, Parent shall conduct
its business, and cause the businesses  of its subsidiaries to be conducted,  in
the  ordinary course of  business and consistent with  past practice, other than
actions taken by Parent or its subsidiaries in contemplation of the Merger,  and
shall  not directly  or indirectly do,  or propose  to do, any  of the following
without the prior written consent of the Company:
 
        (a) amend  or otherwise  change  Parent's Certificate  of  Incorporation
    (other  than with respect to immaterial changes thereto), or amend the terms
    of the Parent Common Stock;
 
        (b) acquire or agree  to acquire, by merging  or consolidating with,  by
    purchasing  an equity interest in  or a portion of the  assets of, or by any
    other manner, any business or  any corporation, partnership, association  or
    other  business organization  or division  thereof, or  otherwise acquire or
    agree to acquire any assets of any other person, which, in each case,  would
    materially   delay  or   prevent  the   consummation  of   the  transactions
    contemplated by this Agreement;
 
        (c) sell,  transfer, license,  sublicense or  otherwise dispose  of  any
    material assets; or
 
        (d)  take, or agree in writing or  otherwise to take, any of the actions
    described in Section 5.03(a)  through (c) above, or  any action which  would
    make  any of the  representations or warranties of  Parent contained in this
    Agreement untrue or  incorrect or  prevent Parent from  performing or  cause
    Parent  not to perform its covenants hereunder or would result in any of the
    conditions to the Merger to be satisfied by Parent not being satisfied.
 
                                   ARTICLE VI
                             ADDITIONAL AGREEMENTS
 
    SECTION 6.01.    PROXY  STATEMENT/PROSPECTUS; REGISTRATION  STATEMENT.    As
promptly  as practicable after the execution  of this Agreement, the Company and
Parent shall prepare  and file with  the SEC preliminary  proxy materials  which
shall    constitute   the   Proxy    Statement   of   the    Company   and   the
 
                                      A-25
<PAGE>
prospectus of Parent with  respect to the  Parent Common Stock  to be issued  in
connection  with  the  Merger. As  promptly  as practicable  after  comments are
received from the SEC thereon and after the furnishing by the Company and Parent
of all information  required to  be contained  therein, the  Company and  Parent
shall  file with the SEC a combined proxy and registration statement on Form S-4
(or on such other form as shall be appropriate) relating to the approval of  the
Merger  by the stockholders of the Company  and shall use all reasonable efforts
to cause the Registration  Statement to become effective  as soon thereafter  as
practicable.  The Proxy Statement shall include  the recommendation of the Board
in favor of the Merger, subject to the second sentence of Section 5.02(a).
 
    SECTION 6.02.  STOCKHOLDERS' MEETING.  The Company shall in accordance  with
Delaware  Law and the Company's Certificate of Incorporation and Bylaws call and
hold the  Company  Stockholders' Meeting  as  promptly as  practicable  for  the
purpose  of voting upon  the approval of  the Merger, PROVIDED  that the Company
shall not be required  to call or  hold a stockholders  meeting while the  Offer
remains  outstanding. The Company shall use  its reasonable best efforts to hold
the Company Stockholders' Meeting as soon as practicable after the date on which
the Registration Statement becomes effective. Subject to the second sentence  of
Section  5.02(a), the Company  shall use its reasonable  best efforts to solicit
from its stockholders proxies in favor of the approval of the Merger, and  shall
take  all other action necessary  or advisable to secure  the vote or consent of
stockholders required by Delaware Law to obtain such approvals.
 
    SECTION 6.03.   ACCESS  TO INFORMATION;  CONFIDENTIALITY.   Upon  reasonable
notice  and subject to  restrictions contained in  confidentiality agreements to
which such party is subject, the Company and Parent shall each (and shall  cause
each  of their subsidiaries to) afford  to the officers, employees, accountants,
counsel and other representatives  of the other,  reasonable access, during  the
period  prior to  the Effective Time,  to all its  properties, books, contracts,
commitments and records  and, during such  period, the Company  and Parent  each
shall  (and shall cause each  of their subsidiaries to)  furnish promptly to the
other all information concerning its business, properties and personnel as  such
other  party may reasonably request, and each  shall make available to the other
the  appropriate  individuals  (including   attorneys,  accountants  and   other
professionals)  for discussion of the other's business, properties and personnel
as either party may reasonably request.  Each party shall keep such  information
confidential in accordance with the terms of the confidentiality agreement dated
December  15,  1996 (the  "CONFIDENTIALITY  AGREEMENT") between  Parent  and the
Company.
 
    SECTION 6.04.  CONSENTS; APPROVALS.   The Company and Parent shall each  use
their best efforts to obtain all consents, waivers, approvals, authorizations or
orders   (including,  without   limitation,  all   United  States   and  foreign
governmental and regulatory rulings and  approvals), and the Company and  Parent
shall  make all filings (including, without  limitation, all filings with United
States and foreign governmental or  regulatory agencies) required in  connection
with  the authorization, execution and delivery of this Agreement by the Company
and Parent and the consummation by them of the transactions contemplated hereby.
 
    SECTION 6.05.    STOCK  OPTIONS.   At  the  Effective  Time,  the  Company's
obligations with respect to each outstanding Option, whether vested or unvested,
shall,  by  virtue of  this  Agreement and  without  any further  action  of the
Company, Parent  or the  holder of  any  Option, be  assumed by  Parent.  Unless
otherwise  elected by Parent prior to the Effective Time, Parent shall make such
assumption in such  manner that Parent  (i) is a  corporation "assuming a  stock
option  in a transaction to which Section  424(a) applies" within the meaning of
Section 424 of the Code or (ii) to the extent that Section 424 of the Code  does
not  apply to such Option,  would be such a corporation  were Section 424 of the
Code applicable to  such Option;  and, if not  so otherwise  elected, after  the
Effective  Time, all references to the Company in the Stock Option Plans and the
applicable stock option  agreements shall be  deemed to refer  to Parent,  which
shall  have assumed the Stock Option Plans as of the Effective Time by virtue of
this Agreement and without any further action. Each Option so assumed by  Parent
under  this Agreement shall continue to have,  and be subject to, the same terms
and conditions set forth in the applicable Stock Option Plan and the  applicable
stock  option agreement  as in effect  immediately prior to  the Effective Time,
except   that    (i)    such   Option    will    be   exercisable    for    that
 
                                      A-26
<PAGE>
number  of shares of Parent  Common Stock equal to the  product of the number of
shares  of  Company  Common  Stock  that  were  purchasable  under  such  Option
immediately prior to the Effective Time multiplied by 1.0, subject to adjustment
in  the manner provided for in Section  2.06(e), rounded up to the nearest whole
number of shares of Parent Common Stock,  and (ii) the per share exercise  price
for  the shares of  Parent Common Stock  issuable upon exercise  of such assumed
Option will be equal to the  quotient determined by dividing the exercise  price
per  share  of  Company  Common  Stock  at  which  such  Option  was exercisable
immediately prior to  the Effective Time  by 1.0, subject  to adjustment in  the
manner  provided for  in Section  2.06(e), and  rounding the  resulting exercise
price up to the nearest whole cent. Parent shall use its best efforts to ensure,
that Options intended to qualify as incentive stock options under Section 422 of
the Code prior to the Effective Time continue to so qualify after the  Effective
Time.
 
    SECTION 6.06.  COMPANY STOCK PURCHASE PLAN.  (a) The Company shall take such
actions  as are necessary to cause the  "exercise date" (referred to as the last
day of the "Purchase Period", as such term is used in the Company Stock Purchase
Plan) applicable to the then current Purchase Period to be the last trading  day
on  which the  Company Common  Stock is  traded on  the New  York Stock Exchange
immediately prior to  the Effective  Time (the "FINAL  COMPANY PURCHASE  DATE");
PROVIDED, THAT, such change in the "exercise date" shall be conditioned upon the
consummation  of the  Merger. On  the Final  Company Purchase  Date, the Company
shall apply the funds credited as of such date under the Company Stock  Purchase
Plan  within each participant's payroll withholdings  account to the purchase of
whole shares of Company Common Stock in accordance with the terms of the Company
Stock Purchase Plan. The cost to each participant in the Company Stock  Purchase
Plan for shares of Company Common Stock shall be the lower of 85% of the closing
sale  price of Company Common Stock, as  reported on the New York Stock Exchange
composite tape (as published in THE WALL STREET JOURNAL) on (i) the first day of
the then current Purchase Period or (ii) the last trading day on or prior to the
Final Company Purchase Date.
 
    (b) Employees of the Company as of the Effective Time shall be permitted  to
participate  in Parent's  Employee Stock Purchase  Plan commencing  on the first
enrollment date following  the Effective  Time, subject to  compliance with  the
eligibility  provisions  of  such  plan (with  employees  receiving  credit, for
purposes of such eligibility provisions, for service with the Company).
 
    SECTION 6.07.  EMPLOYMENT MATTERS.  (a) The Surviving Corporation and Parent
shall honor the terms and provisions in the Employment Agreement, dated May  27,
1995, between J. Phillip Samper and the Company.
 
    (b)  As contemplated  by Section 3.04(d),  the Parachute Plans  shall not be
applicable to  the Surviving  Corporation or  Parent after  consummation of  the
transactions   contemplated   hereby.  Parent   currently  intends   to  employ,
immediately after  the Offer,  a substantial  portion of  the employees  of  the
Company.  Parent,  Merger  Sub  and  the Company  agree  that  the  policies and
procedures specified  on  Annex  B  shall  apply  for  the  twelve-month  period
following the closing of the Offer.
 
    SECTION  6.08.   AGREEMENTS  OF AFFILIATES.   The  Company shall  deliver to
Parent, prior to the date the Registration Statement becomes effective under the
Securities Act, a letter  (the "AFFILIATE LETTER")  identifying all persons  who
are,  or may be deemed to be, at the time of the Company Stockholders' Meetings,
"affiliates" of the Company for purposes  of Rule 145 under the Securities  Act.
The Company shall use its best efforts to cause each person who is identified as
an  "affiliate"  in the  Affiliate Letter  to  deliver to  Parent, prior  to the
Effective Time, a written agreement (an "AFFILIATE AGREEMENT") in  substantially
the form of Annex C hereto.
 
    SECTION 6.09.  INDEMNIFICATION.  (a) The Certificate of Incorporation of the
Surviving   Corporation   shall   contain  the   provisions   with   respect  to
indemnification set forth in the Certificate of Incorporation and By-Laws of the
Company, which provisions shall not  be amended, repealed or otherwise  modified
for  a period  of six  years from the  Effective Time  in any  manner that would
adversely affect the rights thereunder of individuals who at the Effective  Time
were  directors or officers of the Company, unless such modification is required
by law.
 
                                      A-27
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    (b) The Company shall, to the fullest extent permitted under applicable  law
or under the Company's Certificate of Incorporation or By-Laws and regardless of
whether the Merger becomes effective, indemnify and hold harmless, and after the
Effective  Time,  the Surviving  Corporation and  Parent  shall, to  the fullest
extent permitted under applicable law  or under the Surviving Corporation's  and
Parent's, as the case may be, Certificate of Incorporation or By-Laws, indemnify
and  hold  harmless, each  director and  officer of  the Company  or any  of its
subsidiaries (collectively,  the "INDEMNIFIED  PARTIES")  against any  costs  or
expenses (including attorneys' fees), judgments, fines, losses, claims, damages,
liabilities and amounts paid in settlement in connection with any claim, action,
suit,  proceeding or  investigation, whether civil,  criminal, administrative or
investigative, arising out of  or pertaining to any  action or omission by  such
director or officer by virtue of their holding the office of director or officer
occurring  at or prior to the Effective Time (including, without limitation, the
transactions contemplated by this Agreement) for a period of six years after the
Effective Time. In  the event  of any such  claim, action,  suit, proceeding  or
investigation  (whether arising  before or  after the  Effective Time),  (i) any
counsel retained by the Indemnified Parties  for any period after the  Effective
Time  shall be reasonably  satisfactory to the  Surviving Corporation and Parent
and (ii) neither the  Surviving Corporation nor Parent  shall be liable for  any
settlement  effected without  its written  consent (which  consent shall  not be
unreasonably withheld).
 
    SECTION 6.10.   NOTIFICATION OF  CERTAIN MATTERS.   The  Company shall  give
prompt  notice to Parent, and Parent shall give prompt notice to the Company, of
(i)  the  occurrence,  or  non-occurrence,  of  any  event  the  occurrence,  or
non-occurrence, of which would be likely to cause any representation or warranty
contained  in this Agreement to be untrue  or inaccurate and (ii) any failure of
the Company, Parent or Merger Sub, as the case may be, materially to comply with
or satisfy any covenant, condition or agreement to be complied with or satisfied
by it hereunder; PROVIDED, HOWEVER, that the delivery of any notice pursuant  to
this  Section  shall  not  limit  or  otherwise  affect  the  remedies available
hereunder to the party receiving such notice; and PROVIDED, FURTHER that failure
to give  such notice  shall not  be  treated as  a breach  of covenant  for  the
purposes  of Sections 7.02(a) and 7.03(a) unless the failure to give such notice
results in material prejudice to the other party.
 
    SECTION 6.11.  FURTHER ACTION.  Upon the terms and subject to the conditions
hereof, each of  the parties  hereto in good  faith shall  use all  commercially
reasonable  efforts to  take, or cause  to be taken,  all actions and  to do, or
cause to be done, all other things necessary, proper or advisable to  consummate
and  make effective as promptly as  practicable the transactions contemplated by
this Agreement, to obtain in a timely manner all necessary waivers, consents and
approvals and  to  effect  all  necessary  registrations  and  filings,  and  to
otherwise  satisfy  or cause  to be  satisfied all  conditions precedent  to its
obligations under this Agreement.
 
    SECTION 6.12.  PUBLIC ANNOUNCEMENTS.   Parent and the Company shall  consult
with  each other before issuing any press release or otherwise making any public
statements with respect to the Merger or this Agreement and shall not issue  any
such  press release or make any such  public statement without the prior consent
of the other party, which shall not be unreasonably withheld; PROVIDED, HOWEVER,
that a party may, without the prior consent of the other party, issue such press
release or make  such public  statement as  may upon  the advice  of counsel  be
required  by law or  the NYSE if it  has used all  reasonable efforts to consult
with the other party.
 
    SECTION 6.13.   LISTING  OF PARENT  COMMON  SHARES.   Parent shall  use  its
reasonable  best efforts to cause the shares of Parent Common Stock to be issued
in the  Merger,  upon  exercise  of  the Options  and  upon  conversion  of  the
Convertible Debentures, to be approved for listing on the NYSE.
 
                                      A-28
<PAGE>
                                  ARTICLE VII
                            CONDITIONS TO THE MERGER
 
    SECTION  7.01.    CONDITIONS  TO  OBLIGATION OF  EACH  PARTY  TO  EFFECT THE
MERGER.  The respective obligations of each party to effect the Merger shall  be
subject  to the satisfaction at or prior  to the Effective Time of the following
conditions:
 
        (a)   EFFECTIVENESS OF  THE REGISTRATION  STATEMENT.   The  Registration
    Statement shall have been declared effective by the SEC under the Securities
    Act.  No  stop  order  suspending  the  effectiveness  of  the  Registration
    Statement shall have  been issued  by the SEC  and no  proceedings for  that
    purpose  and no similar  proceeding in respect of  the Proxy Statement shall
    have been initiated or threatened by the SEC;
 
        (b)  STOCKHOLDER  APPROVAL.  This  Agreement and the  Merger shall  have
    been  approved and adopted by the requisite  vote of the stockholders of the
    Company;
 
        (c)  HSR ACT.  The waiting period applicable to the consummation of  the
    Merger under the HSR Act shall have expired or been terminated;
 
        (d)  NO INJUNCTIONS OR RESTRAINTS; ILLEGALITY.  No temporary restraining
    order,  preliminary or  permanent injunction  or other  order issued  by any
    court of competent jurisdiction or other similar binding legal restraint  or
    prohibition  (an  "INJUNCTION") preventing  the  consummation of  the Merger
    shall be in effect, nor shall  any proceeding brought by any  administrative
    agency  or commission  or other  governmental authority  or instrumentality,
    domestic or foreign,  seeking any  of the  foregoing be  pending; and  there
    shall  not be any  action taken, or  any statute, rule,  regulation or order
    enacted, entered, enforced or deemed  applicable to the Merger, which  makes
    the consummation of the Merger illegal;
 
        (e)  NYSE LISTING.  The Parent Common Shares to be issued in the Merger,
    upon  exercise  of  the  Options  and  upon  conversion  of  the Convertible
    Debentures shall  have  been approved  for  listing, subject  to  notice  of
    issuance, on the NYSE; and
 
        (f)  OFFER.  Parent shall have made, or caused to be made, the Offer and
    shall  have purchased,  or caused  to be  purchased, Shares  pursuant to the
    Offer.
 
    SECTION 7.02.   ADDITIONAL CONDITIONS  TO OBLIGATIONS OF  PARENT AND  MERGER
SUB.   The obligations  of Parent and Merger  Sub to effect  the Merger are also
subject to the following conditions:
 
        (a)  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
    of the Company contained in this Agreement shall be true and correct in  all
    respects   on  and  as  of  the  Effective  Time,  except  for  (i)  changes
    contemplated by this  Agreement, (ii) those  representations and  warranties
    which  address matters only as of a particular date (which shall remain true
    and correct as  of such date)  and (iii) where  the failure to  be true  and
    correct  would not have a  Material Adverse Effect on  the Company, with the
    same force and effect as if made on and as of the Effective Time;
 
        (b)  AGREEMENTS  AND COVENANTS.   The  Company shall  have performed  or
    complied in all material respects with all agreements and covenants required
    by  this Agreement to be performed or complied with by it on or prior to the
    Effective Time;
 
        (c)   CONSENTS OBTAINED.   All  material consents,  waivers,  approvals,
    authorizations  or orders required to be  obtained, and all filings required
    to be made, by the Company for the authorization, execution and delivery  of
    this  Agreement and the consummation by  it of the transactions contemplated
    hereby shall have been obtained and made by the Company;
 
                                      A-29
<PAGE>
        (d)   GOVERNMENTAL  ACTIONS.   There  shall not  have  been  instituted,
    pending  or threatened  any action  or proceeding  (or any  investigation or
    other inquiry that  might result  in such an  action or  proceeding) by  any
    governmental  authority  or  administrative agency  before  any governmental
    authority, administrative  agency or  court of  competent jurisdiction,  nor
    shall  there be in effect any judgment,  decree or order of any governmental
    authority, administrative  agency or  court  of competent  jurisdiction,  in
    either  case,  seeking  to  prohibit or  limit  Parent  from  exercising all
    material rights and privileges pertaining to its ownership of the  Surviving
    Corporation  or  the  ownership  or  operation  by  Parent  or  any  of  its
    subsidiaries of  all or  a material  portion of  the business  or assets  of
    Parent or any of its subsidiaries, or seeking to compel Parent or any of its
    subsidiaries  to dispose of or hold separate  all or any material portion of
    the business or assets of Parent or any of its subsidiaries, as a result  of
    the Merger or the transactions contemplated by this Agreement;
 
        (e)   MATERIAL ADVERSE CHANGE.  Since  the date of this Agreement, there
    shall have  been no  change,  occurrence or  circumstance in  the  business,
    results  of  operations  or  financial  condition  of  the  Company  or  any
    subsidiary of the  Company having or  reasonably likely to  have a  Material
    Adverse Effect; and
 
        (f)  AFFILIATE AGREEMENTS.  Parent shall have received from each officer
    and  director  person  who  is  identified in  the  Affiliate  Letter  as an
    "affiliate" of the Company an  Affiliate Agreement, and each such  Affiliate
    Agreement shall be in full force and effect.
 
    SECTION  7.03.   ADDITIONAL CONDITIONS  TO OBLIGATION  OF THE  COMPANY.  The
obligation of the Company to effect the Merger is also subject to the  following
conditions:
 
        (a)  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
    of  Parent and  Merger Sub  contained in  this Agreement  shall be  true and
    correct in all  respects on and  as of  the Effective Time,  except for  (i)
    changes  contemplated  by  this Agreement,  (ii)  those  representations and
    warranties which address matters only as  of a particular date (which  shall
    remain  true and correct as of such date)  and (iii) failures to be true and
    correct that would not have a  Material Adverse Effect on the Company,  with
    the same force and effect as if made on and as of the Effective Time;
 
        (b)    AGREEMENTS  AND COVENANTS.    Parent  and Merger  Sub  shall have
    performed or  complied in  all  material respects  with all  agreements  and
    covenants  required by  this Agreement to  be performed or  complied with by
    them on or prior to the Effective Time;
 
        (c)   CONSENTS OBTAINED.   All  material consents,  waivers,  approvals,
    authorizations  or orders required to be  obtained, and all filings required
    to be made, by  Parent and Merger Sub  for the authorization, execution  and
    delivery  of this Agreement and the consummation by them of the transactions
    contemplated hereby shall have been obtained  and made by Parent and  Merger
    Sub; and
 
        (d)   MATERIAL ADVERSE CHANGE.  Since  the date of this Agreement, there
    shall have  been no  change,  occurrence or  circumstance in  the  business,
    results  of operations or financial condition of Parent or any subsidiary of
    Parent having or reasonably likely to have a Material Adverse Effect.
 
                                  ARTICLE VIII
                                  TERMINATION
 
    SECTION 8.01.  TERMINATION.   This Agreement may  be terminated at any  time
prior   to  the  Effective   Time,  notwithstanding  approval   thereof  by  the
stockholders of the Company:
 
        (a) by mutual written consent duly authorized by the boards of directors
    of Parent and the Company; or
 
                                      A-30
<PAGE>
        (b) by either Parent or  the Company if the  Merger shall not have  been
    consummated by September 30, 1996 (PROVIDED that the right to terminate this
    Agreement  under this  Section 8.01(b) shall  not be available  to any party
    whose failure to fulfill  any obligation under this  Agreement has been  the
    cause of or resulted in the failure of the Merger to occur on or before such
    date); or
 
        (c) by either Parent or the Company if a court of competent jurisdiction
    or  governmental, regulatory  or administrative  agency or  commission shall
    have issued a  non-appealable final  order, decree  or ruling  or taken  any
    other  action, in  each case having  the effect  of permanently restraining,
    enjoining or otherwise prohibiting the Merger; or
 
        (d) by Parent,  if the Offer  shall not have  been consummated prior  to
    June  30, 1996 (PROVIDED that Parent is not then in material breach hereof);
    or
 
        (e) by Parent,  if (i) the  Board shall withdraw,  modify or change  its
    recommendation  of  this Agreement,  the  Offer or  the  Merger in  a manner
    adverse to Parent or shall have resolved  to do so; or (ii) the Board  shall
    have  taken a "neutral" position with  respect to an Alternative Transaction
    (as defined in Section 8.03(c)); or (iii) any person or "group" (other  than
    Parent  or an affiliate of  Parent) becomes the owner of  20% or more of the
    outstanding shares of Company Common Stock; or
 
        (f) by  Parent or  the Company,  upon a  breach of  any  representation,
    warranty,  covenant or agreement  on the part  of the Company  or Parent and
    Merger  Sub,  respectively,  set   forth  in  this   Agreement  or  if   any
    representation  or  warranty  of  the  Company  or  Parent  and  Merger Sub,
    respectively, shall  have  become untrue,  in  either case,  such  that  the
    conditions  set forth in  Section 7.02(a) or 7.02(b),  or Section 7.03(a) or
    7.03(b), would not be satisfied (a "TERMINATING BREACH"), PROVIDED that,  if
    such  Terminating Breach is curable prior to  the expiration of 30 days from
    its occurrence (but in no event later than September 30, 1996) by Parent  or
    the Company, as the case may be, through the exercise of its reasonable best
    efforts  and for  so long  as Parent  or the  Company, as  the case  may be,
    continues to exercise such reasonable best efforts, neither the Company  nor
    Parent,  respectively,  may  terminate  this  Agreement  under  this Section
    8.01(f) until the expiration of such period without such Terminating  Breach
    having been cured; or
 
        (g)  by  the Company  or Parent,  if  the Board  shall have  resolved to
    accept, or accepted, a Superior Proposal.
 
    SECTION 8.02.  EFFECT OF  TERMINATION.  In the  event of the termination  of
this  Agreement pursuant to Section 8.01,  this Agreement shall forthwith become
void and there shall be no liability on  the part of any party hereto or any  of
its  affiliates, directors, officers or stockholders  except (i) as set forth in
Section 8.03 and Section 9.01 hereof, and (ii) nothing herein shall relieve  any
party from liability for any willful breach hereof.
 
    SECTION  8.03.  FEES AND EXPENSES.  (a)  Except as set forth in this Section
8.03, all fees and expenses incurred  in connection with this Agreement and  the
transactions  contemplated  hereby shall  be paid  by  the party  incurring such
expenses, whether or not the Merger is consummated.
 
    (b) The Company  shall pay  Parent a fee  of $25,000,000  (the "FEE"),  plus
actual,  documented  and reasonable  out-of-pocket  expenses of  Parent,  not in
excess  of  $2,500,000,  relating  to  the  transactions  contemplated  by  this
Agreement  (including,  but  not  limited  to,  fees  and  expenses  of Parent's
counsel), upon the earliest to occur of the following events:
 
        (i) the  termination of  this Agreement  by Parent  pursuant to  Section
    8.01(e), or by Parent or the Company pursuant to Section 8.01(g); or
 
        (ii)  the termination  of this Agreement  by Parent  pursuant to Section
    8.01(f) after a willful breach by the Company of this Agreement; or
 
                                      A-31
<PAGE>
       (iii) the termination  of this  Agreement by Parent  pursuant to  Section
    8.01(d),  if, at the  time of termination there  has been publicly announced
    and  not  withdrawn  an  Alternative  Transaction  (as  defined  in  Section
    8.03(c));
 
       (iv)  the  consummation  of an  Alternative  Transaction on  or  prior to
    December 31, 1996.
 
PROVIDED, HOWEVER,  that  no  Fee  or expense  reimbursement  shall  be  payable
pursuant  to  this Section  8.03(b) if  Parent or  Merger Sub  shall then  be in
intentional material breach of its obligations hereunder.
 
    (c) As  used  herein,  "ALTERNATIVE TRANSACTION"  means  (i)  a  transaction
pursuant  to which  any person (or  group of  persons) other than  Parent or its
affiliates (a "THIRD PARTY") acquires more  than 20% of the outstanding  Shares,
whether  from the  Company or pursuant  to a  tender offer or  exchange offer or
otherwise, (ii) a  merger or  other business combination  involving the  Company
pursuant  to which  any Third  Party acquires more  than 20%  of the outstanding
equity securities of the Company or the entity surviving such merger or business
combination or (iii)  any other transaction  pursuant to which  any Third  Party
acquires  control of assets  (including for this  purpose the outstanding equity
securities of subsidiaries of the Company,  and the entity surviving any  merger
or  business  combination  including  any  of  them)  of  the  Company  and  its
subsidiaries having a  fair market  value equal  to more  than 20%  of the  fair
market  value of all the assets of the  Company and its subsidiaries, taken as a
whole, immediately prior to such  transaction; PROVIDED, HOWEVER, that the  term
Alternative  Transaction shall  not include any  acquisition of  securities by a
broker dealer in connection with a bona fide public offering of such securities.
 
    (d) The Fee  payable pursuant to  Section 8.03(b) shall  be paid within  one
business  day  after the  first  to occur  of  the events  described  in Section
8.03(b)(i), (ii), (iii) and (iv).
 
                                   ARTICLE IX
                               GENERAL PROVISIONS
 
    SECTION  9.01.      EFFECTIVENESS   OF   REPRESENTATIONS,   WARRANTIES   AND
AGREEMENTS.     Except  as   otherwise  provided  in   this  Section  9.01,  the
representations, warranties and  agreements of  each party  hereto shall  remain
operative  and in full force and effect  regardless of any investigation made by
or on behalf of any other party hereto, any person controlling any such party or
any of their officers or directors, whether  prior to or after the execution  of
this Agreement. The representations, warranties and agreements in this Agreement
shall  terminate at the Effective Time or upon the termination of this Agreement
pursuant to Section 8.01,  as the case  may be, except  that the agreements  set
forth  in Section 6.08  shall survive the Effective  Time indefinitely and those
set  forth  in  Section  8.03   shall  survive  termination  indefinitely.   The
Confidentiality  Agreement  shall  survive  termination  of  this  Agreement  as
provided therein.
 
    SECTION 9.02.  NOTICES.  All notices and other communications given or  made
pursuant  hereto shall be in writing and shall be deemed to have been duly given
or made as of the date delivered or mailed if delivered personally or mailed  by
registered  or certified mail (postage prepaid, return receipt requested) to the
parties at the  following addresses (or  at such  other address for  a party  as
shall  be specified by like changes of  address shall be effective upon receipt)
or sent by electronic transmission, with confirmation received, to the  telecopy
number specified below:
 
       (a) If to Parent or Merger Sub:
          Silicon Graphics, Inc.
          2011 North Shoreline Boulevard
          Mail Stop 710
          Mountain View, California 94043-1389
          Telecopier No.: (415) 965-1586
          Attention: Legal Services
 
                                      A-32
<PAGE>
       With a copy to:
          Shearman & Sterling
          555 California Street, Suite 2000
          San Francisco, CA 94104
          Telecopier No.: (415) 616-1199
          Attention: Michael J. Kennedy, Esq.
 
       (b) If to the Company:
          Cray Research, Inc.
          Cray Research Park
          665A Lone Oak Drive
          Eagan, Minnesota 55121
          Telecopier No.: (612) 683-7199
          Attention: General Counsel
 
       With a copy to:
          Proskauer Rose Goetz & Mendelsohn LLP
          1585 Broadway
          New York, NY 10036
          Telecopier No.: (212) 969-2900
          Attention: Daniel R. Kaplan, Esq.
 
    SECTION  9.03.   CERTAIN DEFINITIONS.   For purposes of  this Agreement, the
term:
 
        (a)  "AFFILIATES"  means a  person that directly or indirectly,  through
    one  or more intermediaries, controls, is  controlled by, or is under common
    control with, the first mentioned person; including, without limitation, any
    partnership or joint  venture in  which the first  mentioned person  (either
    alone,  or through or  together with any other  subsidiary) has, directly or
    indirectly, an interest of 10 percent or more;
 
        (b)  "BENEFICIAL  OWNER" with respect  to any shares  of Company  Common
    Stock, means a person who shall be deemed to be the beneficial owner of such
    shares  (i)  which  such  person  or any  of  its  affiliates  or associates
    beneficially owns, directly or indirectly, (ii) which such person or any  of
    its  affiliates or associates (as such term  is defined in Rule 12b-2 of the
    Exchange Act) has, directly or indirectly, (A) the right to acquire (whether
    such right is  exercisable immediately  or subject  only to  the passage  of
    time),  pursuant to any agreement, arrangement  or understanding or upon the
    exercise of consideration rights, exchange  rights, warrants or options,  or
    otherwise,  or (B) the right to  vote pursuant to any agreement, arrangement
    or  understanding  or  (iii)  which  are  beneficially  owned,  directly  or
    indirectly,  by  any other  persons  with whom  such  person or  any  of its
    affiliates or  person with  whom such  person or  any of  its affiliates  or
    associates  has any agreement, arrangement  or understanding for the purpose
    of acquiring, holding, voting or disposing of any shares;
 
        (c)  "BUSINESS DAY" means any day other than a day on which banks in San
    Francisco are required or authorized to be closed;
 
        (d)  "CONTROL" (including  the terms "CONTROLLED  BY" and "UNDER  COMMON
    CONTROL WITH") means the possession, directly or indirectly or as trustee or
    executor, of the power to direct or cause the direction of the management or
    policies  of a person, whether through the ownership of stock, as trustee or
    executor, by contract or credit arrangement or otherwise;
 
        (e)       when used  in  connection  with  the Company  or  any  of  its
    subsidiaries,  or Parent or any of its subsidiaries, as the case may be, the
    term "MATERIAL ADVERSE EFFECT" means any change or effect that, individually
    or when taken  together with  all other such  changes or  effects that  have
 
                                      A-33
<PAGE>
    occurred  prior  to  the date  of  determination  of the  occurrence  of the
    Material Adverse Effect, is or is reasonably likely to be materially adverse
    to the  business, operations,  condition  (financial or  otherwise),  assets
    (including intangible assets) or liabilities (including, without limitation,
    contingent  liabilities) or prospects of the Company and its subsidiaries or
    Parent and its subsidiaries,  as the case  may be, in each  case taken as  a
    whole;
 
        (f)      "PERSON"   means  an   individual,   corporation,  partnership,
    association, trust, unincorporated organization,  other entity or group  (as
    defined in Section 13(d)(3) of the Exchange Act); and
 
        (g)    "SUBSIDIARY"  or  "SUBSIDIARIES" of  the  Company,  the Surviving
    Corporation, Parent or any other person means any corporation,  partnership,
    joint  venture or  other legal  entity of  which the  Company, the Surviving
    Corporation, Parent or such other person,  as the case may be (either  alone
    or  through  or  together  with any  other  subsidiary),  owns,  directly or
    indirectly, more than 50% of the stock or other equity interests the holders
    of which are generally  entitled to vote  for the election  of the board  of
    directors or other governing body of such corporation or other legal entity.
 
    SECTION  9.04.   AMENDMENT.   This Agreement may  be amended  by the parties
hereto by action taken by or on  behalf of their respective boards of  directors
at any time prior to the Effective Time; PROVIDED, HOWEVER, that, after approval
of the Merger by the stockholders of the Company, no amendment may be made which
by  law  requires further  approval by  such  stockholders without  such further
approval. This Agreement may not be  amended except by an instrument in  writing
signed by the parties hereto.
 
    SECTION  9.05.  WAIVER.  At any time  prior to the Effective Time, any party
hereto may with respect to  any other party hereto (a)  extend the time for  the
performance  of any of the obligations or other acts, (b) waive any inaccuracies
in the  representations  and warranties  contained  herein or  in  any  document
delivered pursuant hereto and (c) waive compliance with any of the agreements or
conditions  contained herein. Any such extension or waiver shall be valid if set
forth in an instrument  in writing signed  by the party or  parties to be  bound
thereby.
 
    SECTION  9.06.  HEADINGS.  The headings  contained in this Agreement are for
reference purposes  only  and  shall  not  affect in  any  way  the  meaning  or
interpretation of this Agreement.
 
    SECTION  9.07.   SEVERABILITY.    If any  term  or other  provision  of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law,
or public policy, all  other conditions and provisions  of this Agreement  shall
nevertheless  remain in full force  and effect so long  as the economic or legal
substance of the transactions contemplated hereby is not affected in any  manner
adverse  to any party. Upon such determination  that any term or other provision
is invalid, illegal  or incapable of  being enforced, the  parties hereto  shall
negotiate  in good faith to  modify this Agreement so  as to effect the original
intent of the parties as closely as possible in an acceptable manner to the  end
that transactions contemplated hereby are fulfilled to the extent possible.
 
    SECTION  9.08.   ENTIRE AGREEMENT.   This  Agreement constitutes  the entire
agreement and supersedes all prior  agreements and undertakings (other than  the
Confidentiality  Agreement), both written and oral, among the parties, or any of
them, with  respect  to the  subject  matter  hereof and,  except  as  otherwise
expressly  provided herein, are not intended to confer upon any other person any
rights or remedies hereunder.
 
    SECTION 9.09.  ASSIGNMENT, MERGER SUB.  This Agreement shall not be assigned
by operation of law or otherwise, except  that Parent and Merger Sub may  assign
all  or any  of their rights  hereunder to  any affiliate provided  that no such
assignment shall relieve the assigning party of its obligations hereunder.
 
    SECTION 9.10.  PARTIES  IN INTEREST.  This  Agreement shall be binding  upon
and  inure  solely to  the benefit  of each  party hereto,  and nothing  in this
Agreement, express  or  implied  (including, without  limitation,  Section  6.07
hereof), is intended to or shall confer upon any other person any right, benefit
 
                                      A-34
<PAGE>
or  remedy of any nature whatsoever under  or by reason of this Agreement, other
than Section 6.08 (which is  intended to be for  the benefit of the  Indemnified
Parties and may be enforced by such Indemnified Parties).
 
    SECTION  9.11.  FAILURE  OR INDULGENCE NOT WAIVER;  REMEDIES CUMULATIVE.  No
failure or delay on the  part of any party hereto  in the exercise of any  right
hereunder  shall  impair  such right  or  be construed  to  be a  waiver  of, or
acquiescence in, any breach of any representation, warranty or agreement herein,
nor shall any single  or partial exercise  of any such  right preclude other  or
further exercise thereof or of any other right. All rights and remedies existing
under  this Agreement  are cumulative  to, and not  exclusive of,  any rights or
remedies otherwise available.
 
    SECTION 9.12.   GOVERNING LAW.   THIS AGREEMENT  SHALL BE  GOVERNED BY,  AND
CONSTRUED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF DELAWARE.
 
    SECTION  9.13.  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts, and by the different parties hereto in separate counterparts, each
of which when executed shall be deemed to be an original but all of which  taken
together shall constitute one and the same agreement.
 
    SECTION  9.14.  WAIVER  OF JURY TRIAL.   EACH OF PARENT,  MERGER SUB AND THE
COMPANY HEREBY IRREVOCABLY WAIVES, TO THE  FULLEST EXTENT PERMITTED BY LAW,  ALL
RIGHTS TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED
UPON  CONTRACT, TORT OR OTHERWISE) ARISING OUT  OF OR RELATING TO THIS AGREEMENT
OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREBY.
 
    IN WITNESS WHEREOF,  Parent, Merger  Sub and  the Company  have caused  this
Agreement  to be executed as of the date first written above by their respective
officers thereunto duly authorized.
 
                                          SILICON GRAPHICS, INC.
                                          By        /S/ THOMAS A. JERMOLUK
 
                                             -----------------------------------
                                             Name: Thomas A. Jermoluk
                                             Title:  President and Chief
                                             Operating Officer
 
                                          C ACQUISITION CORPORATION
                                          By        /S/ THOMAS A. JERMOLUK
 
                                             -----------------------------------
                                             Name: Thomas A. Jermoluk
                                             Title:  President
 
                                          CRAY RESEARCH, INC.
                                          By        /S/ J. PHILLIP SAMPER
 
                                             -----------------------------------
                                             Name: J. Phillip Samper
                                             Title:  Chairman and Chief
                                             Executive Officer
 
                                      A-35
<PAGE>
                                                                         ANNEX A
 
                            CONDITIONS TO THE OFFER
 
    Notwithstanding any other provision  of the Offer, subject  to the terms  of
the  Merger Agreement, Merger Sub shall not be required to accept for payment or
pay for any Shares tendered  pursuant to the Offer,  and may terminate or  amend
the  Offer and may postpone the acceptance for payment of and payment for Shares
tendered, if (i) the Minimum Condition  shall not have been satisfied, (ii)  any
applicable  waiting period  under the  HSR Act  shall not  have expired  or been
terminated prior to  the expiration of  the Offer, or  (iii) at any  time on  or
after  the date of  this Agreement, and  prior to the  acceptance for payment of
Shares, any of the following conditions shall exist:
 
        (a) there shall  have been instituted  or be pending  or threatened  any
    action  or proceeding by any governmental or quasi-governmental authority or
    agency,  domestic   or   foreign,   before  any   court   or   governmental,
    administrative or regulatory authority or agency, of competent jurisdiction,
    domestic  or foreign, (i) challenging or seeking to make illegal, materially
    delay or  otherwise directly  or  indirectly restrain  or prohibit  or  make
    materially  more costly the making of  the Offer, the acceptance for payment
    of, or payment for, any Shares by Parent, Merger Sub or any other  affiliate
    of  Parent,  or the  consummation of  any other  Transaction, or  seeking to
    obtain material damages in connection with any Transaction; (ii) seeking  to
    prohibit  or limit  materially the  ownership or  operation by  the Company,
    Parent or any of their  subsidiaries of all or  any material portion of  the
    business  or assets of the Company, Parent  or any of their subsidiaries, or
    to compel the Company, Parent or any of their subsidiaries to dispose of  or
    hold  separate all or any material portion  of the business or assets of the
    Company,  Parent  or  any  of  their  subsidiaries,  as  a  result  of   the
    Transactions; (iii) seeking to impose or confirm material limitations on the
    ability  of Parent, Merger Sub or any  other affiliate of Parent to exercise
    effectively full  rights  of ownership  of  any Shares,  including,  without
    limitation,  the right to vote any Shares acquired by Merger Sub pursuant to
    the Offer or otherwise  on all matters properly  presented to the  Company's
    stockholders,  including, without  limitation, the approval  and adoption of
    this Agreement and  the transactions  contemplated hereby;  (iv) seeking  to
    require  divestiture by Parent, Merger Sub  or any other affiliate of Parent
    of any Shares; or (v) which otherwise has a Material Adverse Effect or which
    is  reasonably  likely   to  materially  adversely   affect  the   business,
    operations,  properties,  condition  (financial  or  otherwise),  assets  or
    liabilities  (including,  without  limitation,  contingent  liabilities)  or
    prospects of the Company or Parent;
 
        (b)  there  shall have  been  any action  taken,  or any  statute, rule,
    regulation,  legislation,  interpretation,  judgment,  order  or  injunction
    enacted,   entered,  enforced,   promulgated,  amended,   issued  or  deemed
    applicable to (i)  Parent, the  Company or  any subsidiary  or affiliate  of
    Parent  or the  Company or  (ii) any  Transaction, by  any legislative body,
    court, government or governmental, administrative or regulatory authority or
    agency, domestic  or foreign,  other  than the  routine application  of  the
    waiting  period provisions of the HSR Act  to the Offer or the Merger, which
    is reasonably likely  in the good  faith judgment of  the Parent to  result,
    directly  or indirectly, in  any of the consequences  referred to in clauses
    (i) through (v) of paragraph (a) above;
 
        (c) after  February 25,  1996,  there shall  have occurred  any  change,
    condition,  event or development  that has a Material  Adverse Effect on the
    Company;
 
        (d) there  shall  have  occurred  (i)  any  general  suspension  of,  or
    limitation  on  prices  for,  trading  in securities  on  the  NYSE,  (ii) a
    declaration of a banking moratorium or any suspension of payments in respect
    of banks  in the  United States,  (iii) a  commencement of  a war  or  armed
    hostilities or other national or international crisis directly or indirectly
    involving  the United  States or (iv)  in the  case of any  of the foregoing
    existing on the  date hereof, in  the good  faith judgment of  the Parent  a
    material acceleration or worsening thereof;
 
                                      A-36
<PAGE>
        (e)  (i) it shall have been publicly  disclosed or Merger Sub shall have
    otherwise learned that beneficial ownership (determined for the purposes  of
    this  paragraph as  set forth in  Rule 13d-3 promulgated  under the Exchange
    Act) of 20% or more of the then outstanding Shares has been acquired by  any
    person,  other than Parent or any of its affiliates or (ii) (A) the Board or
    any committee thereof shall have withdrawn  or modified in a manner  adverse
    to  Parent or Merger  Sub the approval  or recommendation of  the Offer, the
    Merger or  the Merger  Agreement, or  approved or  recommended any  takeover
    proposal  or any other  acquisition of Shares  other than the  Offer and the
    Merger or (B) the Board or any  committee thereof shall have resolved to  do
    any of the foregoing;
 
        (f)  any  representation  or  warranty  of  the  Company  in  the Merger
    Agreement which is qualified as to materiality shall not be true and correct
    or any such representation or warranty that is not so qualified shall not be
    true and  correct  in  any  material  respect,  in  each  case  as  if  such
    representation  or warranty was made as of such time on or after the date of
    the Merger  Agreement, except  for (i)  changes contemplated  by the  Merger
    Agreement,  (ii) those representations and  warranties which address matters
    only as of a particular date (which shall remain true and correct as of such
    date) and (iii) where the  failure to be true and  correct would not have  a
    Material Adverse Effect on the Company;
 
        (g) the Company shall have failed to perform in any material respect any
    obligation  or  to comply  in  any material  respect  with any  agreement or
    covenant of the Company  to be performed  or complied with  by it under  the
    Merger Agreement;
 
        (h) the Merger Agreement shall have been terminated; or
 
        (i)  Merger Sub and the Company shall  have agreed that Merger Sub shall
    terminate the Offer or postpone the acceptance for payment of or payment for
    Shares thereunder;
 
which, in the reasonable good faith judgment of Merger Sub in any such case, and
regardless of the circumstances (including any  action or inaction by Parent  or
any  of its affiliates) giving rise to  any such condition, makes it inadvisable
to proceed with such acceptance for payment or payment.
 
    The foregoing conditions are for the  sole benefit of Merger Sub and  Parent
and  may be  asserted by  Merger Sub or  Parent regardless  of the circumstances
giving rise to any such  condition or may be waived  by Merger Sub or Parent  in
whole or in part at any time and from time to time in their sole discretion. The
failure  by Parent or  Merger Sub at any  time to exercise  any of the foregoing
rights shall not be deemed  a waiver of any such  right; the waiver of any  such
right  with respect  to particular  facts and  other circumstances  shall not be
deemed a waiver with respect to any other facts and circumstances; and each such
right shall be deemed an ongoing right that may be asserted at any time and from
time to time.
 
                                      A-37
<PAGE>
                                                                         ANNEX B
 
                            CERTAIN EMPLOYEE MATTERS
                            POLICIES AND PROCEDURES
 
<TABLE>
<S>        <C>                      <C>
I.         GENERAL:                 In  general, the  Surviving Corporation  shall offer severance
                                    benefits as provided in the  Cray Research, Inc. 1995  Amended
                                    and  Restated Severance Pay Plan  for Cray Research, Inc. (the
                                    "EXISTING PLAN").
 
II.        BASE PAYMENTS:           Employees whose  employment  is  terminated  for  one  of  the
                                    reasons  described in Section III (ii) below shall be entitled
                                    to the following payments:
 
                                     (i)  EXECUTIVE OFFICERS (defined as Robert H. Ewald, Laurence
                                         L. Betterley, Irene M. Qualters and Michael R. Dungworth)
                                         shall be entitled to a lump sum cash payment equal to two
                                         times such Executive Officer's Base Pay;
 
                                     (ii)  OFFICERS  AND OFFICER  EQUIVALENTS (defined  consistent
                                         with   the   Company's   existing   internal  designation
                                         consisting of approximately 50 people) shall be  entitled
                                         to  a  lump  sum cash  payment  equal to  one  times such
                                         Officer's and Officer Equivalent's Base Pay; and
 
                                    (iii)   ALL OTHER  EMPLOYEES (including  part-time  employees)
                                         shall  be entitled to a  lump sum cash payment calculated
                                         and payable pursuant  to Section C  of the Existing  Plan
                                         plus,  to the  extent consistent with  the Company's most
                                         recent reduction in force,  an additional per  individual
                                         payment not to exceed two months' Base Pay agreed upon by
                                         Parent  and  the Company  acting  reasonably and  in good
                                         faith.
 
III.       OTHER BENEFITS:          Other severance benefits shall be  offered as provided in  the
                                    Existing  Plan  (including,  without  limitation,  payment for
                                    accrued and unused personal time), subject to the following:
 
                                     (i)  in all  cases where relevant,  the provision of  health,
                                         life,  disability and COBRA  benefits (provided that, for
                                         the purposes of COBRA, Parent shall pay for three  months
                                         of  the employee's portion of the cost of such terminated
                                         employee's medical insurance  prior to the  date of  such
                                         employee's  termination)  as  offered  by  Parent  to its
                                         employees shall be deemed to satisfy the requirements  of
                                         the Existing Plan; and
 
                                     (ii)   termination shall mean  elimination of a person's job,
                                         termination  without  cause  and  resignation  for  "good
                                         reason,"  which shall include only the following: (i) 15%
                                         or  more  reduction  in  a  person's  Base  Pay  or  (ii)
                                         relocation  more  than  35  miles  from  a  person's then
                                         current work location.
 
IV.        PERFORMANCE              These policies and procedures shall not apply to  terminations
           EVALUATIONS:             in connection with normal cause performance evaluations.
 
V.         BASE PAY:                Means all regular straight time earnings, exclusive of payment
                                    for   overtime,   shift   premiums,   incentive  compensation,
                                    incentive   payments,    bonuses,   commissions    or    other
                                    compensation.
</TABLE>
 
                                      A-38
<PAGE>
<TABLE>
<S>        <C>                      <C>
VI.        COMMUNICATIONS:          Between  the date hereof and consummation of the Offer, Parent
                                    and Company shall  co-ordinate communications regarding  these
                                    policies and procedures to Company employees
</TABLE>
 
                                      A-39
<PAGE>
                                                                         ANNEX C
 
                          FORM OF AFFILIATE AGREEMENT
 
                                                                          , 1996
 
Silicon Graphics, Inc.
2011 N. Shoreline Blvd.
Mail Stop 710
Mountain View, CA 94043-1389
Attention: Legal Services
Ladies and Gentlemen:
 
    Pursuant  to  the terms  of the  Agreement and  Plan of  Merger dated  as of
February 25, 1996 (the  "AGREEMENT"), among Silicon  Graphics, Inc., a  Delaware
corporation  ("PARENT"), C  Acquisition Corporation, a  Delaware corporation and
wholly owned subsidiary  of Parent ("MERGER  SUB"), and Cray  Research, Inc.,  a
Delaware  corporation (the "COMPANY"),  Parent will acquire  the Company through
the merger of Merger Sub  with and into the  Company (the "MERGER"). Subject  to
the  terms and conditions of the Agreement, at the Effective Time (as defined in
the Agreement), outstanding  shares of  the common  stock, par  value $1.00  per
share,  of the Company ("COMPANY COMMON STOCK") will be converted into the right
to receive shares of  the common stock,  par value $0.001  per share, of  Parent
("PARENT  COMMON STOCK"), and, in certain events, cash on the basis described in
the Agreement.
 
    The undersigned has been advised  that as of the date  hereof he, she or  it
may  be deemed to be  an "affiliate" of the Company,  as the term "affiliate" is
defined for purposes  of paragraphs (c)  and (d) of  Rule 145 of  the Rules  and
Regulations  (the  "RULES  AND  REGULATIONS")  of  the  Securities  and Exchange
Commission (the "COMMISSION") under the Securities Act of 1933, as amended  (the
"ACT").
 
    The   undersigned  understands  that  the  representations,  warranties  and
covenants set  forth herein  will  be relied  upon  by Parent,  stockholders  of
Parent,  the Company,  other stockholders  of the  Company and  their respective
counsel and accountants.
 
    The undersigned represents and warrants to and agrees with Parent that:
 
     1. The undersigned  has full power  to execute and  deliver this  Affiliate
Agreement  and to make the representations  and warranties herein and to perform
its obligations hereunder.
 
     2. The undersigned  has carefully read  this letter and  the Agreement  and
discussed its requirements and other applicable limitations upon his, her or its
ability  to sell, transfer  or otherwise dispose  of Parent Common  Stock to the
extent the undersigned felt necessary, with  his, her or its counsel or  counsel
for the Company.
 
     3.  The undersigned shall not make  any sale, transfer or other disposition
of Parent Common Stock in violation of the Act or the Rules and Regulations.
 
     4. The undersigned has been advised  that the issuance of shares of  Parent
Common  Stock to the undersigned in connection  with the Merger has been or will
be registered with the Commission under  the Act on a Registration Statement  on
Form S-4. However, the undersigned has also been advised that, since at the time
the  Merger was  or will  be submitted  for a  vote of  the stockholders  of the
Company the undersigned may be deemed to  have been an affiliate of the  Company
and  the distribution by the undersigned of any Parent Common Stock has not been
registered under the Act,  the undersigned may not  sell, transfer or  otherwise
dispose  of Parent Common Stock  issued to the undersigned  in the Merger unless
(i) such sale, transfer or other disposition has been registered under the  Act,
(ii)  such sale, transfer  or other disposition  is made in  conformity with the
requirements of
 
                                      A-40
<PAGE>
Rule 145 promulgated by the Commission under the Act, or (iii) in the opinion of
counsel  reasonably  acceptable  to  Parent,   such  sale,  transfer  or   other
disposition is otherwise exempt from registration under the Act.
 
     5.  Parent is under no  obligation to register the  sale, transfer or other
disposition of Parent  Common Stock by  the undersigned  or on his,  her or  its
behalf  under the  Act or to  take any other  action necessary in  order to make
compliance with an exemption from such registration available.
 
     6. Stop transfer instructions will be given to Parent's transfer agent with
respect to  the  Parent Common  Stock  and that  there  will be  placed  on  the
certificates  for  the Parent  Common Stock  issued to  the undersigned,  or any
substitutions therefor, a legend stating in substance:
 
        "THE SHARES REPRESENTED BY THIS CERTIFICATE WERE ISSUED IN A TRANSACTION
    TO WHICH RULE 145 PROMULGATED UNDER THE SECURITIES ACT OF 1933 APPLIES.  THE
    SHARES REPRESENTED BY THIS CERTIFICATE MAY ONLY BE TRANSFERRED IN ACCORDANCE
    WITH  THE  TERMS  OF  AN  AGREEMENT  DATED  FEBRUARY  25,  1996  BETWEEN THE
    REGISTERED HOLDER  HEREOF  AND  SILICON  GRAPHICS, INC.,  A  COPY  OF  WHICH
    AGREEMENT IS ON FILE AT THE PRINCIPAL OFFICES OF SILICON GRAPHICS, INC."
 
     7.  Unless the transfer by the undersigned of his, her or its Parent Common
Stock has been registered under the Act or is a sale made in conformity with the
provisions of Rule 145, Parent reserves the right to put the following legend on
the certificates issued to any transferee of the undersigned:
 
        "THE SHARES REPRESENTED  BY THIS  CERTIFICATE HAVE  NOT BEEN  REGISTERED
    UNDER  THE  SECURITIES ACT  OF  1933 AND  WERE  ACQUIRED FROM  A  PERSON WHO
    RECEIVED SUCH SHARES IN  A TRANSACTION TO WHICH  RULE 145 PROMULGATED  UNDER
    THE  SECURITIES ACT OF  1933 APPLIES. THE  SHARES HAVE BEEN  ACQUIRED BY THE
    HOLDER  NOT  WITH  A  VIEW  TO,  OR  FOR  RESALE  IN  CONNECTION  WITH,  ANY
    DISTRIBUTION  THEREOF WITHIN THE  MEANING OF THE SECURITIES  ACT OF 1933 AND
    MAY NOT BE  SOLD, PLEDGED  OR OTHERWISE  TRANSFERRED EXCEPT  PURSUANT TO  AN
    EFFECTIVE REGISTRATION STATEMENT OR IN ACCORDANCE WITH AN EXEMPTION FROM THE
    REGISTRATION REQUIREMENTS OF THE SECURITIES ACT OF 1933."
 
     8.  The legends set forth  in paragraphs 6 and 7  above shall be removed by
delivery of substitute certificates without such legend if the undersigned shall
have delivered to Parent a copy of a letter from the staff of the Commission, or
an opinion of counsel in form  and substance reasonably satisfactory to  Parent,
to the effect that such legend is not required for purposes of the Act.
 
     9.  The undersigned is  the beneficial owner  of (i.e., has  sole or shared
voting or investment  power with respect  to) all the  shares of Company  Common
Stock  and options to purchase  Company Common Stock indicated  on the last page
hereof (the  "Company  Securities").  Except for  the  Company  Securities,  the
undersigned  does not beneficially own any shares of Company Common Stock or any
other equity securities of the Company or any options, warrants or other  rights
to acquire any equity securities of the Company.
 
    10.  The undersigned intends to vote all Company Common Stock held by him or
her on the record date for the stockholders' meeting to be held to consider  the
Merger in favor of the Merger.
 
    11.  The undersigned will not exercise dissenters' rights in connection with
the Merger.
 
                                      A-41
<PAGE>
                    NUMBER OF SHARES OF COMPANY COMMON STOCK
                     BENEFICIALLY OWNED BY THE UNDERSIGNED:
 
                            ------------------------
 
                    NUMBER OF SHARES OF COMPANY COMMON STOCK
               SUBJECT TO OPTIONS, OR ISSUABLE UPON CONVERSION OF
         CONVERTIBLE DEBENTURES, BENEFICIALLY OWNED BY THE UNDERSIGNED:
 
                            ------------------------
 
                                          Very truly yours,
                                          --------------------------------------
                                          (print name of stockholder)
 
                                          By:
                                          --------------------------------------
                                              Name:
                                             Title:
                                             (if applicable)
 
Accepted this     day of
               , 1996, by
SILICON GRAPHICS, INC.
 
By:
- ------------------------------------------
Name:
Title:
 
                                      A-42
<PAGE>
                         [SALOMON BROTHERS LETTERHEAD]
 
                                                                         ANNEX B
 
February 25, 1996
 
Board of Directors
Cray Research, Inc.
655A Lone Oak Drive
Eagan, MN 55121
 
Members of the Board:
 
    You  have requested  our opinion as  investment bankers as  to the fairness,
from a financial point of  view, to the holders of  shares of common stock,  par
value  $1.00 per share (the "Company Common Stock"), of Cray Research, Inc. (the
"Company") of the consideration to be  received by such holders in the  proposed
acquisition  of the Company  by Silicon Graphics,  Inc. ("Acquiror") pursuant to
the Agreement and  Plan of Merger  (the "Agreement") by  and among the  Company,
Acquiror  and C Acquisition  Corporation, a wholly  owned subsidiary of Acquiror
("Subco").
 
    As more  specifically set  forth in  the Agreement,  Subco will  commence  a
tender  offer  (the  "Proposed Tender  Offer")  to purchase  up  to seventy-five
percent (75%) of the outstanding shares  of Company Common Stock for $30.00  per
share  in  cash,  subject to  the  condition that  at  least a  majority  of the
outstanding shares of Company Common Stock be tendered and purchased.  Following
consummation  of the Proposed Tender  Offer, Subco will be  merged with and into
the Company (the "Proposed Merger" and, together with the Proposed Tender Offer,
the "Proposed Transaction") and  each then outstanding  share of Company  Common
Stock (other than shares held by Acquiror, Subco or any of their subsidiaries or
shares  as  to  which  appraisal  rights  have  been  properly  exercised  under
applicable law)  will be  converted in  the Proposed  Merger into  the right  to
receive  one share  of common stock  of Acquiror (the  "Acquiror Common Stock"),
subject to adjustment  in the  event less than  75% of  the outstanding  Company
Common  Stock is purchased pursuant to the  Proposed Tender Offer such that each
such share of Company Common Stock will be converted into the right to receive a
fraction of  a  share  of Acquiror  Common  Stock  plus cash,  each  in  amounts
calculated  so that the aggregate number of  shares of Acquiror Common Stock and
the aggregate cash  paid in the  Proposed Tender Offer  and the Proposed  Merger
shall  be the same  as would have been  paid had 75%  of the outstanding Company
Common Stock been purchased in the Proposed Tender Offer.
 
    As you are aware, Salomon Brothers Inc has acted as financial advisor to the
Company in connection with the Proposed  Transaction and will receive a fee  for
our  services, a substantial portion of which is contingent upon consummation of
the Proposed Transaction. In addition, in  the ordinary course of our  business,
we  may actively trade  the debt and  equity securities of  both the Company and
Acquiror for our own account and for the accounts of customers and, accordingly,
may at any time hold a long or short position in such securities.
 
                                      B-1
<PAGE>
                                                         [SALOMON BROTHERS LOGO]
 
    In connection with  rendering our  opinion, we have  reviewed and  analyzed,
among  other things, the following:  (i) the final draft  of the Agreement; (ii)
certain publicly  available information  concerning the  Company, including  the
Annual  Reports on Form 10-K of  the Company for each of  the years in the three
year period ended December 31,  1994 and the Quarterly  Reports on Form 10-Q  of
the  Company for the quarters  ended September 30, June  30, and March 31, 1995,
respectively; (iii) certain other  internal information, primarily financial  in
nature,  including projections,  concerning the  business and  operations of the
Company furnished  to us  by the  Company  for purposes  of our  analysis;  (iv)
certain  publicly  available  information  concerning the  trading  of,  and the
trading market for,  the Company  Common Stock; (v)  certain publicly  available
information  concerning Acquiror, including  the Annual Reports  on Form 10-K of
Acquiror for each of the years in the three year period ended June 30, 1995  and
the  Quarterly Reports on Form 10-Q of  Acquiror for the quarters ended December
31,  and  September  30,  1995,   respectively;  (vi)  certain  other   internal
information,  primarily financial  in nature,  including projections, concerning
the business and operations of Acquiror furnished to us by Acquiror for purposes
of our analysis;  (vii) certain  publicly available  information concerning  the
trading  of,  and the  trading  market for,  the  Acquiror Common  Stock; (viii)
certain publicly available information with  respect to certain other  companies
that  we believe  to be comparable  to the  Company or Acquiror  and the trading
markets for  certain  of such  other  companies' securities;  and  (ix)  certain
publicly  available information concerning the nature and terms of certain other
transactions that we consider relevant to  our inquiry. We have also  considered
such   other  information,  financial   studies,  analyses,  investigations  and
financial, economic and market  criteria that we deemed  relevant. We have  also
met  with certain officers and employees of the Company and Acquiror, to discuss
the foregoing as well as other matters we believe relevant to our inquiry.
 
    In our review and analysis and in  arriving at our opinion, we have  assumed
and  relied upon the accuracy and completeness of all of the financial and other
information provided  us  or  publicly  available  and  have  neither  attempted
independently  to verify  nor assumed responsibility  for verifying  any of such
information. We  have  not  conducted  a  physical  inspection  of  any  of  the
properties  or  facilities of  the  Company or  Acquiror,  nor have  we  made or
obtained or assumed any responsibility  for making or obtaining any  independent
evaluations  or appraisals of any such properties or facilities. With respect to
projections, we have assumed  that they have been  reasonably prepared on  bases
reflecting  the  best  currently  available  estimates  and  judgements  of  the
managements of the Company and Acquiror as to the future financial  performances
of  the  Company  and Acquiror  and  we express  no  view with  respect  to such
projections or the assumptions on which they were based.
 
    In conducting our analysis and arriving at our opinion as expressed  herein,
we  have  considered  such  financial  and  other  factors  as  we  have  deemed
appropriate under the circumstances including, among others, the following:  (i)
the  historical and current financial position  and results of operations of the
Company and Acquiror; (ii) the business  prospects of the Company and  Acquiror;
(iii)  the historical and current  market for the Company  Common Stock, for the
Acquiror Common Stock and for the  equity securities of certain other  companies
that we believe to be comparable to the Company or Acquiror; and (iv) the nature
and  terms  of certain  other  acquisition transactions  that  we believe  to be
relevant. We have also  taken into account our  assessment of general  economic,
market  and financial  conditions as well  as our experience  in connection with
similar transactions and securities valuation generally. We have also considered
the process  that  resulted in  the  negotiation of  the  Proposed  Transaction,
including discussions with other potential acquirors. Our opinion necessarily is
based  upon conditions as they exist and can be evaluated on the date hereof and
we assume  no  responsibility  to  update  or  revise  our  opinion  based  upon
circumstances or events occurring after the
 
                                      B-2
<PAGE>
                                                         [SALOMON BROTHERS LOGO]
 
date  hereof. Our opinion as  expressed below does not  constitute an opinion or
imply any conclusion  as to  the likely trading  range for  the Acquiror  Common
Stock following consummation of the Proposed Transaction. Our opinion is, in any
event,  limited  to  the  fairness,  from a  financial  point  of  view,  of the
consideration to be received by the holders  of the Company Common Stock in  the
Proposed  Transaction  and does  not address  the Company's  underlying business
decision to effect the  Proposed Transaction or  constitute a recommendation  to
any  holder of  Company Common  Stock as  to whether  such holder  should tender
shares of the Company  Common Stock in  the Proposed Tender Offer  or as to  how
such holder should vote with respect to the Proposed Merger.
 
    Based upon and subject to the foregoing, we are of the opinion as investment
bankers  that the  consideration to  be received by  the holders  of the Company
Common Stock in  the Proposed  Transaction is fair,  from a  financial point  of
view, to such holders.
 
                                          Sincerely,
 
                                          /s/ Salomon Brothers Inc
 
                                            [SALOMON BROTHERS SIGNATURE]
 
                                      B-3
<PAGE>
                                                                         ANNEX C
 
                              CRAY RESEARCH, INC.
                              AMENDED AND RESTATED
                        1989 EMPLOYEE BENEFIT STOCK PLAN
 
1.  PURPOSE.
 
    This  Plan  is intended  to provide  a  means for  Cray Research,  Inc. (the
"Company"), by granting  shares of  Company stock in  the form  of stock  grants
("Stock Grants"), grants of restricted stock ("Restricted Stock") and options to
purchase  Company  stock  ("Options")  to  selected  management  and  other  key
employees, to attract and retain persons of ability and motivate them to advance
the interests of the Company. An employee eligible to participate under the Plan
is hereinafter referred to as an "Employee."
 
    It is intended that  the Plan be interpreted  in accordance with Rule  16b-3
under  the Securities Exchange Act of 1934,  as amended (the "Exchange Act"). It
is also intended that, except as otherwise  limited by paragraph 2, some or  all
of  the Options  granted to Employees  under the Plan  may constitute "incentive
stock options" within the meaning of Section 422 of the Internal Revenue Code of
1986, as amended (the  "Code"), and some  or all of  the Options may  constitute
"nonstatutory  options", i.e., options not qualifying under Section 422 or other
similar provisions  of  the Code.  Unless  otherwise indicated,  the  terms  and
conditions  of  the Plan  shall apply  equally  to all  Stock Grants,  grants of
Restricted Stock  and  Options  hereunder,  regardless  of  whether  Options  be
incentive stock options or nonstatutory options.
 
2.  ADDITIONAL DEFINITIONS.
 
    As used herein, the following definitions apply:
 
    (a)  "Continuous Status  as an Employee"  means that the  relationship as an
       Employee is  not interrupted  or terminated  by the  Company.  Continuous
       Status as an Employee shall not be considered interrupted in the case of:
       (i)  any leave of absence approved  by the Company, including sick leave,
       military leave, or any other personal leave; provided, however, that  for
       purposes  of qualifying  an Option as  an incentive stock  option, in the
       event any such leave exceeds ninety (90) days, the Employee's  Continuous
       Status  as  an  Employee  will  be  deemed  to  have  terminated  on  the
       ninety-first (91st)  day after  the commencement  of such  leave,  unless
       re-employment upon the expiration of such leave is guaranteed by contract
       (including  certain  Company  policies)  or  statute;  or  (ii) transfers
       between  locations  of  the  Company  or  between  the  Company  and  its
       subsidiaries.
 
    (b)  "Disability" means total and permanent disability as defined in Section
       22(e)(3) of the Code.
 
    (c) "Fair Market Value" means, as of any date, the closing price for a share
       of Common Stock as reported daily in THE WALL STREET JOURNAL or a similar
       readily available public source  (or if no sales  of shares were made  on
       such  date, the closing  price of a  share as reported  for the preceding
       day), unless  the Committee  shall determine  that such  method does  not
       reflect,  due to  circumstances prevailing  at that  time, the  true fair
       market value of the Company's Common Stock. In that event, the  Committee
       shall  determine fair market value through  such alternative method as it
       may in good faith determine to be then appropriate.
 
3.  SHARES SUBJECT TO THE PLAN.
 
    Subject to adjustment as provided in Section 11, a total of 7,888,000 shares
of authorized  but  unissued  or  reacquired Common  Stock  of  the  Company  is
authorized  and reserved for issuance to Employees under the Plan in the form of
Stock Grants or  grants of  Restricted Stock or  upon the  exercise of  Options;
provided,  however, that  no more  than 7,888,000  shares shall  be cumulatively
available for the grant of incentive stock options under the Plan. If any Option
expires or terminates
 
                                      C-1
<PAGE>
without having been exercised in  full, the unacquired shares (including  shares
forfeited  on  the  termination  of  any grant  of  Restricted  Stock)  shall be
available for the grant  of future Stock Grants,  grants of Restricted Stock  or
Options under the Plan.
 
4.  ADMINISTRATION.
 
    The  Plan shall be administered by a  Committee of the Board of Directors of
the Company, consisting of at least  two (2) disinterested persons not  eligible
to  participate under this Plan  or under any other stock  or option plan of the
Company or its subsidiaries except as  may be permitted in accordance with  Rule
16b-3 under the Exchange Act (the "Committee").
 
5.  ELIGIBILITY.
 
    The  Committee  shall determine  the Employees  to whom,  and the  number of
shares for which, Stock Grants, grants of Restricted Stock and/or Options  shall
be   granted,   taking   into   consideration   such   factors,   including  any
recommendations of  the Chief  Executive Officer  of the  Company, as  it  deems
relevant to select and motivate employees of ability to advance the interests of
the  Company.  Employees so  selected shall  be either  management or  other key
employees of the Company or its subsidiaries, who the Committee determines  have
contributed  materially to the  success of the  Company or are  in a position to
contribute materially to the future success of the Company. Except as  hereafter
limited,  an Employee from time to time  may be granted any combination of Stock
Grants, grants of Restricted  Stock and Options  (incentive or nonstatutory)  as
the Committee shall determine.
 
    An  employee shall not be  eligible to receive an  incentive stock option if
immediately before the Option is to  be granted the employee owns (directly  and
through  application of  the constructive  stock ownership  attribution rules of
Section 424(d) of the Code) more than  ten percent of the total combined  voting
power  of all classes of  stock of the Company  or any subsidiary. The aggregate
Fair Market Value (determined at the time  an Option is granted) of shares  with
respect  to which incentive stock options are  exercisable for the first time by
an Employee during any calendar year (under this Plan and all other plans of the
Company and its  subsidiaries pursuant  to Section 422  of the  Code) shall  not
exceed $100,000.
 
6.  STOCK OPTIONS.
 
    All  Options granted  hereunder shall  be evidenced  by an  Option Agreement
executed as of the date of grant by the Company and the Employee, on such  terms
as may be determined by the Committee, including the following:
 
    (a)  The Option Agreement  shall specify whether the  Option is an incentive
       stock option or a nonstatutory option.
 
    (b) The "date  of grant"  for any  Option granted  under the  Plan shall  be
       specified in the Option Agreement.
 
    (c)  The Option exercise  price per share  shall be specified  in the Option
       Agreement and shall be equal to 100% of the Fair Market Value of a  share
       of Company Common Stock on the date of grant.
 
    (d)  The Option exercise  price shall be  paid at the  time of exercise. The
       consideration to be paid for the shares to be issued upon exercise of  an
       Option,  including  the method  of payment,  shall  be determined  by the
       Committee (and,  in the  case  of an  incentive  stock option,  shall  be
       determined  at the time of grant) and  may consist entirely of: (1) cash;
       (2) check; (3) promissory note; (4) other shares which (i) in the case of
       shares acquired  upon exercise  of  an option,  have  been owned  by  the
       Employee  for more than six months on the date of surrender and (ii) have
       an aggregate Fair Market Value on the date of surrender not greater  than
       the  aggregate exercise price of the shares as to which said Option shall
       be exercised;  (5)  delivery  of  a  properly  executed  exercise  notice
       together  with such other documentation as  the Committee and the broker,
       if applicable, shall  require to  effect an  exercise of  the Option  and
       delivery  to the Company of the sale or loan proceeds required to pay the
       exercise price; (6) any
 
                                      C-2
<PAGE>
       combination of  the  foregoing methods  of  payment; or  (7)  such  other
       consideration  and method  of payment for  the issuance of  shares as the
       Committee  determines  are  consistent   with  the  Plan's  purpose   and
       applicable  law. Any  fractional share  not required  for payment  of the
       Option exercise price shall  be paid for  by the Company  in cash on  the
       basis of the same value utilized for such exercise.
 
    (e)  At the  time an  Option is granted,  the Committee  shall determine the
       terms and  conditions to  be satisfied  before shares  may be  purchased,
       including  the dates on which  shares subject to the  Option may first be
       purchased. The Committee may specify that an Option may not be  exercised
       until  the completion of a service period specified at the time of grant.
       (Any such period is referred to  herein as the "waiting period.") At  the
       time  an Option  is granted,  the Committee  shall fix  the period within
       which the Option may  be exercised, which shall  not be earlier than  the
       end of the waiting period, if any, nor, in the case of an Incentive Stock
       Option, later than ten (10) years from the date of grant.
 
    (f)  An incentive stock option hereunder shall not contain terms pursuant to
       which the exercise  of the Option  would affect the  Employee's right  to
       exercise  a nonstatutory option  hereunder, or vice  versa, such that the
       incentive stock option would be deemed a prohibited "tandem stock option"
       within the  meaning  of Section  422  of  the Code  and  the  regulations
       thereunder.
 
    (g)  Unless  the issuance  of  the shares  upon  the exercise  of  an Option
       hereunder is  registered or  exempt under  federal and  state  securities
       laws, the Employee shall be required to give an investment representation
       at   the  time  of  exercise,  and   transfer  of  the  shares  shall  be
       appropriately restricted.
 
    (h) During the lifetime of an Employee, Options held by such Employee may be
       exercised only by the Employee and only while an Employee of the  Company
       or  of a parent or a subsidiary of  the Company and only if such Employee
       has maintained his or her Continuous Status as an Employee since the date
       such Options were granted; provided, however, that:
 
        (1) In  the  event  an  Employee's  Continuous  Status  as  an  Employee
           terminates  (other than  upon his  or her  death or  Disability), the
           Option holder may exercise  his or her Option,  but only within  such
           period  of time from the date of such termination as is determined by
           the Committee,  not to  exceed three  (3) months  in the  case of  an
           Option that is intended to qualify as an incentive stock option, and,
           unless determined otherwise by the Committee, only to the extent that
           the  Employee  was  entitled  to  exercise it  at  the  date  of such
           termination (but in no event later than the expiration of the term of
           such Option as set forth in the Option Agreement). To the extent that
           the Employee was not  entitled to exercise an  Option at the date  of
           such  termination, and to the extent that he or she does not exercise
           such Option (to  the extent  otherwise so entitled)  within the  time
           specified herein, the Option shall terminate.
 
        (2)  In  the  event  an  Employee's  Continuous  Status  as  an Employee
           terminates as a result  of his or her  Disability, the Option  holder
           may  exercise his or  her Option, but only  within twelve (12) months
           from the date of such  termination, and, unless determined  otherwise
           by  the Committee, only to the  extent that the Employee was entitled
           to exercise it at the date of such termination (but in no event later
           than the expiration of the  term of such Option  as set forth in  the
           Option  Agreement). To the extent that  the Employee was not entitled
           to exercise an  Option at the  date of such  termination, and to  the
           extent  that he or she  does not exercise such  Option (to the extent
           otherwise so entitled) within the  time specified herein, the  Option
           shall terminate.
 
        (3)  In the  event of  an Employee's death,  the Employee's  estate or a
           person who acquired  the right  to exercise  the deceased  Employee's
           Option  by bequest or  inheritance may exercise  the Option, but only
           within twelve (12) months  following the date  of death, and,  unless
           determined  otherwise by the  Committee, only to  the extent that the
           Employee was
 
                                      C-3
<PAGE>
           entitled to exercise it at the date  of death (but in no event  later
           than  the expiration of the  term of such Option  as set forth in the
           Option Agreement). To the extent  that the Employee was not  entitled
           to  exercise an Option at  the date of death,  and to the extent that
           the Employee's estate or a person who acquired the right to  exercise
           such Option does not exercise such Option (to the extent otherwise so
           entitled)   within  the  time  specified  herein,  the  Option  shall
           terminate.
 
        (4) Except  as otherwise  provided,  in no  event  shall any  Option  be
           exercisable at any time after its expiration date.
 
        (5)  On a case-by-case basis, the Committee may, in its sole discretion,
           accelerate the schedule of the time  or times when an Option  granted
           under this Plan may be exercised or extend the period for exercise to
           a  time after the expiration date. Unless otherwise determined by the
           Committee at the time of grant, each Option shall provide that in the
           event of a  change in  control of the  Company (as  specified by  the
           Committee),  any Employee's  Options will become  exercisable in full
           if, within twenty-four (24) months after  a change in control of  the
           Company (as specified by the Committee), the Employee's employment is
           terminated  without  cause or  the  Employee resigns  due  to certain
           involuntary relocations or reductions  in compensation, as  specified
           by the Committee. Each Option granted under the Plan may contain such
           other terms, provisions and conditions not inconsistent with the Plan
           as may be determined by the Committee.
 
    (i)  The  Options  granted hereunder  may  not be  sold,  pledged, assigned,
       hypothecated, transferred or disposed of in any manner other than by will
       or by the laws  of descent or distribution  and may be exercised,  during
       the  lifetime of the Employee, only by  the Employee and only during such
       person's  continuous  status  as  an  Employee,  except  as  provided  in
       subparagraph (h) above.
 
    (j)    If the  Employee  sells, exchanges  or  otherwise disposes  of shares
       acquired upon exercise of an incentive stock option within two (2)  years
       of  the date of  grant, or one (1)  year after the  date of exercise, the
       Employee shall be required to notify the Company promptly in writing  and
       disclose  the amount of gain or loss resulting from the sale, exchange or
       other disposition of his or her stock.
 
7.  STOCK GRANTS.
 
    The Committee may, in its discretion, award a Stock Grant to an Employee  in
furtherance of the Plan's purposes; provided, however, that no Employee shall be
eligible  to receive a  Stock Grant for  more than fifty  (50) shares of Company
Common Stock in any calendar year. An Employee receiving a Stock Grant shall  be
entitled  to all of the rights and privileges  in the Common Stock awarded as of
the date on which the award is made. Unless the issuance of shares pursuant to a
Stock Grant is registered or exempt under federal or state securities laws,  the
Employee  shall be required to give an  investment representation at the time of
grant, and transfer of the shares shall be appropriately restricted.
 
8.  GRANTS OF RESTRICTED STOCK.
 
    (a) The Committee may, in its discretion and in furtherance of the  purposes
       of  the  Plan, grant  Restricted Stock  to an  Employee. With  respect to
       awards of Restricted Stock, the Committee shall:
 
        (i) Select  the   Employees   to  whom   grants   will  be   made   (the
            "Participants");
 
        (ii) Determine the number of shares to be awarded;
 
        (iii) Determine  the length  of the restricted  period, if  any, and the
              performance and employment conditions  under which the  Restricted
              Stock may be forfeited to the Company, if any;
 
                                      C-4
<PAGE>
        (iv) Determine the purchase price, if any, to be paid by the Participant
             for such Restricted Stock; and
 
        (v) Determine  any  restrictions  other  than those  set  forth  in this
            Section 8.
 
    (b) The terms  of each award  of Restricted Stock  shall be set  forth in  a
       written  award  agreement  (the  "Award  Agreement")  and  a  certificate
       representing the number of shares of Common Stock granted shall be issued
       to the Participant as the registered owner. The certificate  representing
       such shares shall be legended as to sale, transfer, assignment, pledge or
       other encumbrances during the restricted period and shall be deposited by
       the  Participant, together with a stock power endorsed in blank, with the
       Company. Such certificates shall  be held in the  custody of the  Company
       until  the restricted  period expires  or until  all restrictions thereon
       otherwise lapse.
 
    (c) Subject to the restrictions set forth in this Section 8 or in the  Award
       Agreement,  each Participant who receives Restricted Stock shall have all
       rights as a stockholder with respect to such shares, including the  right
       to vote the shares and receive dividends and other distributions.
 
    (d)  The  Award Agreement  may provide,  or  the Committee  may subsequently
       determine in its discretion,  that, in the case  of death, Disability  or
       other special circumstances, any or all restrictions then applicable to a
       Participant's Restricted Stock be waived.
 
    (e)  The Committee  may, in  its sole  discretion, declare  the restrictions
       applicable to  shares of  Restricted Stock  to lapse  in the  event of  a
       change  in control  of the  Company (as  specified by  the Committee), in
       which case the  Company shall  remove all restrictive  legends and  stop-
       transfer orders applicable to the Restricted Stock as of the date of said
       change  in  control and  certificates representing  such shares  shall be
       delivered to the Participants.
 
    (f) Except  as  otherwise  provided  in  this Section  8  or  in  the  Award
       Agreement,  no  shares  of  Restricted Stock  shall  be  sold, exchanged,
       transferred, pledged  or  otherwise  disposed of  during  the  restricted
       period.
 
    (g) With respect to any number of shares of Restricted Stock as to which the
       restrictions  imposed hereunder shall have lapsed, the restrictive legend
       shall be removed and a new  certificate representing the shares shall  be
       delivered  to the Participant. The Committee may, in its sole discretion,
       modify  or  cancel  the  restrictions  imposed  on  Restricted  Stock  or
       otherwise accelerate the vesting of shares of Restricted Stock.
 
9.  TERMINATION.
 
    Unless sooner terminated by action of the Board of Directors of the Company,
the  Plan  shall  terminate ten  (10)  years  from its  effective  date. Options
outstanding under the  Plan at the  time of termination  shall remain in  effect
until exercise or expiration. Restricted Stock outstanding under the Plan at the
time of termination shall remain subject to the restrictions imposed at the time
of  grant  until the  restricted  period expires  or  until all  conditions with
respect thereto otherwise lapse or are satisfied.
 
10.  EFFECTIVE DATE; SHAREHOLDER APPROVAL.
 
    The Plan became effective on September 7, 1988, the date of its adoption  by
the  Board  of Directors  of  the Company,  and  was approved  by  the Company's
stockholders on May 16, 1989. The effective  date of each amendment to the  Plan
shall be the date of adoption of such amendment by the Board of Directors of the
Company;  provided, however, that  in the event the  shareholders of the Company
shall not approve any amendment to the Plan which is determined by the Board  of
Directors to require approval by the shareholders, such amendment shall be of no
effect  and  no Stock  Grant,  grant of  Restricted  Stock or  Option previously
granted shall be effective if the authorization of the
 
                                      C-5
<PAGE>
grant thereof was  contingent on the  effectiveness of such  amendment or  shall
otherwise  be benefited or altered by such  amendment. No Stock Grants or grants
of Restricted Stock shall be made  under the Plan until shareholder approval  of
the Plan amendments authorizing such grants is obtained.
 
11.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION, MERGER OR ASSET
SALE.
 
    (a)  CHANGES  IN  CAPITALIZATION.  Subject to  any  required  action  by the
       stockholders of the Company, the number of shares of Common Stock covered
       by each  outstanding Option,  and each  outstanding grant  of  Restricted
       Stock,  and  the  number  of  shares  of  Common  Stock  which  have been
       authorized for issuance under the Plan but as to which no awards have yet
       to be granted or which have  been returned to the Plan upon  cancellation
       or  expiration of an  award, as well  as the exercise  price per share of
       Common Stock covered by each outstanding Option, shall be proportionately
       adjusted for any increase or decrease  in the number of issued shares  of
       Common  Stock resulting  from a stock  split, reverse  stock split, stock
       dividend, combination or  reclassification of  the Common  Stock, or  any
       other increase or decrease in the number of issued shares of Common Stock
       effected  without  receipt  of consideration  by  the  Company; provided,
       however, that conversion  of any  convertible securities  of the  Company
       shall   not  be  deemed  to  have   been  "effected  without  receipt  of
       consideration." Such adjustment shall be  made by the Company's Board  of
       Directors,  whose determination in  that respect shall  be final, binding
       and conclusive. Except as expressly  provided herein, no issuance by  the
       Company  of shares of stock of  any class, or securities convertible into
       shares of stock of any class,  shall affect, and no adjustment by  reason
       thereof  shall be made with respect to,  the number or price of shares of
       Common Stock subject to an Option.
 
    (b) DISSOLUTION OR LIQUIDATION. In the event of the proposed dissolution  or
       liquidation  of the Company,  to the extent  that an Option  has not been
       previously  exercised,  it  will  terminate  immediately  prior  to   the
       consummation  of such proposed action. The Committee may, in the exercise
       of its sole discretion in such  instances, declare that any Option  shall
       terminate  as of a date  fixed by the Committee  and give each holder the
       right to  exercise his  or  her Option  as  to all  or  any part  of  the
       underlying  Common Stock prior to such expiration, including shares as to
       which the Option would not otherwise be exercisable.
 
    (c) MERGER OR ASSET SALE.  In the event of a  merger of the Company with  or
       into  another corporation, or the sale of substantially all of the assets
       of the Company, each outstanding Option shall be assumed or an equivalent
       Option substituted by the successor corporation or a parent or subsidiary
       of the successor corporation. In the event that the successor corporation
       does not  agree to  assume  the Option  or  to substitute  an  equivalent
       option,  the Committee may,  in lieu of  such assumption or substitution,
       provide for the Option holder to have the right to exercise the Option as
       to all or a portion of  the underlying Common Stock, including shares  as
       to which it would not otherwise be exercisable. If the Committee makes an
       Option  exercisable in lieu of assumption or substitution in the event of
       a merger or sale  of assets, the Committee  shall notify the holder  that
       the  Option shall  be exercisable  for such  period as  the Committee may
       designate, and  the Option  will terminate  upon the  expiration of  such
       period.  For  the purposes  of this  Section 11(c),  the Option  shall be
       considered assumed  if,  immediately  following the  merger  or  sale  of
       assets, the Option confers the right to receive, for each share of Common
       Stock  subject to the Option  immediately prior to the  merger or sale of
       assets, the consideration  (whether stock, cash,  or other securities  or
       property)  received in the merger or sale  of assets by holders of Common
       Stock for each share held on  the effective date of the transaction  (and
       if   holders  were  offered  a  choice  of  consideration,  the  type  of
       consideration chosen by the holders of a majority of outstanding shares);
       provided, however, that if such  consideration received in the merger  or
       sale  of assets was not solely  common stock of the successor corporation
       or its  parent, the  Committee may,  with the  consent of  the  successor
       corporation  and the Option  holder, provide for  the consideration to be
       received upon the
 
                                      C-6
<PAGE>
       exercise of the  Option, for each  share of Common  Stock subject to  the
       Option,  to be  solely common stock  of the successor  corporation or its
       parent equal in Fair Market Value to the per share consideration received
       by holders of Common Stock in the merger or sale of assets.
 
12.  AMENDMENT.
 
    The Board of Directors may amend the Plan at any time as determined to be in
the best interests of  the Company. The Board  of Directors shall not,  however,
without  shareholder approval, increase the maximum  number of shares subject to
the Plan or restrict the class of management and other key employees eligible to
be awarded Stock Grants, Restricted Stock or Options under the Plan.
 
                                      C-7
<PAGE>
                              CRAY RESEARCH, INC.
 
           PROXY FOR SPECIAL MEETING OF STOCKHOLDERS -- JUNE 26, 1996
 
                      THIS PROXY IS SOLICITED ON BEHALF OF
                  THE BOARD OF DIRECTORS OF CRAY RESEARCH INC.
 
    The  undersigned hereby appoints  Robert H. Ewald and  John L. Sullivan, and
each of them, as proxy or proxies of the undersigned (the "Proxies"), each  with
full  power of substitution,  to represent the  undersigned and to  vote all the
shares of common  stock, par value  $1.00 per  share, of Cray  Research Inc.,  a
corporation  organized under the laws of  the State of Delaware (the "Company"),
which the undersigned is entitled in any capacity to vote if personally  present
at the special meeting (the "Special Meeting") of stockholders of the Company to
be  held at  the Company's  headquarters, 655  Lone Oak  Drive, Eagan, Minnesota
55121, at 10:00 a.m., local  time, on Wednesday, June 26,  1996, and at any  and
all adjournments or postponements thereof, with respect to all matters set forth
in  the Proxy Statement dated  May 14, 1996, and  all supplements and amendments
thereto and, in their  discretion, upon all matters  incident to the conduct  of
such  Special Meeting and all matters presented at the Special Meeting but which
are not known to the board of directors of the Company (the "Board") at the time
of the solicitation of this proxy.  The undersigned hereby revokes any proxy  or
proxies  heretofore given by the  undersigned to vote at  the Special Meeting or
any adjournment or postponement thereof.
 
THE BOARD RECOMMENDS A VOTE FOR PROPOSAL 1.
 
1.  Proposal to approve and adopt the Agreement and Plan of Merger, dated as  of
    February   25,  1996,  among  the  Company,  C  Acquisition  Corporation,  a
    corporation organized under the laws of  the State of Delaware and a  direct
    wholly  owned subsidiary of  Silicon Graphics Inc.,  a corporation organized
    under the laws of the State of Delaware ("Parent"), and Parent.
 
    FOR / /                ABSTAIN / /                AGAINST / /
 
THE BOARD RECOMMENDS A VOTE FOR PROPOSAL 2.
 
2.   Proposal to  approve and  ratify amendments  to and  a restatement  of  the
    Company's 1989 Employee Benefit Stock Plan.
 
    FOR / /                ABSTAIN / /                AGAINST / /
 
           [CONTINUED, AND TO BE SIGNED AND DATED, ON THE OTHER SIDE]
<PAGE>
                          [CONTINUED FROM OTHER SIDE]
 
    If   properly  executed,  this  proxy  will  be  voted  in  accordance  with
instructions appearing hereon and, at the  discretion of the Proxies, as to  any
other  matter that may properly come before  the Special Meeting. IN THE ABSENCE
OF SPECIFIC INSTRUCTIONS, THIS PROXY WILL BE VOTED FOR PROPOSAL 1 (THE  APPROVAL
AND  ADOPTION  OF  THE  MERGER  AGREEMENT), FOR  PROPOSAL  2  (THE  APPROVAL AND
RATIFICATION OF THE AMENDMENTS TO AND RESTATEMENT OF THE COMPANY'S 1989 EMPLOYEE
BENEFIT STOCK PLAN)  AND, AT  THE DISCRETION  OF THE  PROXIES, AS  TO ANY  OTHER
MATTER THAT MAY PROPERLY COME BEFORE THE SPECIAL MEETING.
 
    The undersigned hereby acknowledges receipt of the Notice of Special Meeting
of  Stockholders and Proxy Statement (with all enclosures and attachments) dated
May 14, 1996, relating to the Special Meeting.
 
<TABLE>
<S>        <C>                                   <C>         <C>
                                                 Name(s) of
   Dated:  ------------------------------------  Holder(s):  ------------------------------------------------------
 
                                                             ------------------------------------------------------
                                                                                 (Please Print)
                                                             ------------------------------------------------------
                                                                               (Signature(s))(1)
                                                             ------------------------------------------------------
                                                      (By:)                      (Please Print)
                                                             (Name:) ----------------------------------------------
 
                                                                                    (Title:)
                                                                -----------------------------------------------
</TABLE>
 
                                    (1)PLEASE SIGN  THIS PROXY  EXACTLY AS  YOUR
                                          NAME(S)  APPEARS HEREON.  JOINT OWNERS
                                          SHOULD  EACH   SIGN   PERSONALLY.   AN
                                          ATTORNEY,    ADMINISTRATOR,   TRUSTEE,
                                          EXECUTOR,  GUARDIAN  OR  OTHER  PERSON
                                          SIGNING  IN A  REPRESENTATIVE CAPACITY
                                          SHOULD  INDICATE  SUCH  CAPACITY.   AN
                                          AUTHORIZED  OFFICER SIGNING  ON BEHALF
                                          OF A CORPORATION  SHOULD INDICATE  THE
                                          NAME   OF  THE  CORPORATION  AND  SUCH
                                          OFFICER'S CAPACITY.
 
   PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY IN THE ENCLOSED POSTAGE-PAID
 ENVELOPE AS SOON AS POSSIBLE, EVEN IF YOU PLAN TO ATTEND THE SPECIAL MEETING.
<PAGE>
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    Section  145 of the  Delaware General Corporation Law  authorizes a court to
award, or a corporation's  board of directors to  grant, indemnity to  directors
and  officers in terms  sufficiently broad to  permit such indemnification under
certain circumstances  for  liabilities (including  reimbursement  for  expenses
incurred)  arising under the  Securities Act of  1933. The Registrant's Restated
Certificate of  Incorporation  and  Amended  and  Restated  Bylaws  provide  for
indemnification  of its directors,  officers, employees and  other agents to the
maximum extent permitted by the  Delaware General Corporation Law. In  addition,
the  Registrant has entered  into Indemnification Agreements  with its executive
officers  and  directors.  The  Registrant  has  also  purchased  and  maintains
insurance  for its officers, directors,  employees or agents against liabilities
which an officer, a director, an employee or an agent may incur in his  capacity
as such.
 
ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
(A)  EXHIBITS
 
    The  following  exhibits  are  filed  herewith  or  incorporated  herein  by
reference.
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                                  DESCRIPTION
- ----------  --------------------------------------------------------------------------------------------------------
<C>         <S>
      2.1   Agreement and Plan of Merger, dated as of February 25, 1996, by and among the Registrant, C Acquisition
            Corporation and Cray Research, Inc. (incorporated by reference to Annex A to the Proxy
            Statement/Prospectus included as part of this Registration Statement).
 
      5.1*  Opinion of Shearman & Sterling as to the legality of the Registrant's Common Stock being registered
            hereby.
 
     23.1*  Consent of Shearman & Sterling with respect to the legality of securities being registered (contained in
            Exhibit 5.1).
 
     23.2*  Consent of Ernst & Young LLP, independent auditors, with respect to financial statements of the
            Registrant.
 
     23.3*  Consent of KPMG Peat Marwick LLP, independent auditors, with respect to financial statements of Cray
            Research, Inc.
 
     23.4*  Consent of Salomon Brothers Inc with respect to its fairness opinion.
 
     24.1*  Power of Attorney (included on pages II-4 and II-5).
</TABLE>
 
- ------------------------
*  Filed herewith.
 
(B)  FINANCIAL STATEMENT SCHEDULES
 
    The following schedule is  incorporated by reference to  Item 14 of  Silicon
Graphics' Annual Report on Form 10-K for the fiscal year ended June 30, 1995:
 
<TABLE>
<CAPTION>
SCHEDULE                                  DESCRIPTION
- ---------  --------------------------------------------------------------------------
<C>        <S>
   II      Valuations and Qualifying Accounts
</TABLE>
 
    Other  financial statement schedules have been omitted since they are either
not required,  not applicable,  or  the required  information  is shown  in  the
consolidated financial statements or notes thereto.
 
                                      II-1
<PAGE>
(C)  REPORTS, OPINIONS AND APPRAISALS
 
    The  opinion  of Salomon  Brothers Inc  (attached  as Annex  B to  the Proxy
Statement/Prospectus filed as a part of this Registration Statement).
 
ITEM 22.  UNDERTAKINGS
 
    (a) 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;
 
           (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. Notwithstanding  the foregoing, any increase
       or decrease in volume of securities offered (if the total dollar value of
       securities offered would not  exceed that which  was registered) and  any
       deviation  from the  low or  high and  of the  estimated maximum offering
       range may  be  reflected  in  the  form  of  prospectus  filed  with  the
       Commission  pursuant to Rule 424(b) if,  in the aggregate, the changes in
       volume and price represent no more than 20 percent change in the  maximum
       aggregate  offering price set  forth in the  "Calculation of Registration
       Fee" table in the effective Registration Statement; and
 
           (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  (i)  and (ii)  do  not  apply  if the
    Registration Statement  is  on Form  S-3,  Form S-8  or  Form F-3,  and  the
    information  required to be included in  a post-effective amendment by those
    paragraphs is contained in periodic reports  filed with or furnished to  the
    Commission  by  the  Registrant  pursuant  to Section  13  or  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  which  remain  unsold  at  the
    termination of the offering.
 
    (b) 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 15(d) of the  Securities
Exchange  Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to 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)  The undersigned Registrant hereby undertakes  as follows: that prior to
any public reoffering of  the securities registered hereunder  through use of  a
prospectus which is a part of the Registration Statement, by any person or party
who is deemed to be an underwriter within the meaning of Rule 145(c), the issuer
undertakes  that such reoffering prospectus  will contain the information called
for by the applicable registration form  with respect to reofferings by  persons
who may be deemed underwriters, in addition to the information called for by the
other items of the applicable form.
 
                                      II-2
<PAGE>
    (d)  The  Registrant undertakes  that every  prospectus:  (i) that  is filed
pursuant to paragraph (c)  immediately preceding or (ii)  that purports to  meet
the  requirements of Section 10(a)(3) of the  Act and is used in connection with
an offering of securities  subject to Rule 415,  will be filed as  a part of  an
amendment  to  the  Registration  Statement  and will  not  be  used  until such
amendment is  effective, and  that, for  purposes 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.
 
    (e) 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  such  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.
 
    (f) The undersigned Registrant hereby undertakes to respond to requests  for
information  that is incorporated  by reference into  the prospectus pursuant to
Items 4, 10(b), 11  or 13 of this  form, within one business  day of receipt  of
such  request, and  to send  the incorporated documents  by first  class mail or
other equally prompt  means. This  includes information  contained in  documents
filed subsequent to the effective date of the Registration Statement through the
date of responding to the request.
 
    (g)  The undersigned  Registrant hereby undertakes  to supply by  means of a
post-effective amendment  all  information  concerning a  transaction,  and  the
company  being  acquired  involved therein,  that  was  not the  subject  of and
included in the Registration Statement when it became effective.
 
                                      II-3
<PAGE>
                                   SIGNATURES
 
    PURSUANT  TO THE REQUIREMENTS OF THE  SECURITIES ACT OF 1933, THE REGISTRANT
HAS DULY CAUSED THIS REGISTRATION  STATEMENT TO BE SIGNED  ON ITS BEHALF BY  THE
UNDERSIGNED,  THEREUNTO DULY AUTHORIZED, IN THE  CITY OF MOUNTAIN VIEW, STATE OF
CALIFORNIA, ON THE 10TH DAY OF MAY, 1996.
 
                                          SILICON GRAPHICS, INC.
 
                                          By       /s/ EDWARD R. MCCRACKEN
                                          --------------------------------------
                                                     Edward R. McCracken
                                                CHAIRMAN AND CHIEF EXECUTIVE
                                                         OFFICER
 
                               POWER OF ATTORNEY
 
    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes  and appoints  Edward R.  McCracken, Stanley  J. Meresman  and
William M. Kelly, jointly and severally, his or her attorneys-in-fact, each with
the  power of substitution, for him or her in any and all capacities to sign any
amendments to the Registration  Statement, and to file  the same, with  exhibits
thereto  and other  documents in connection  therewith, with  the Securities and
Exchange Commission,  hereby ratifying  and  confirming all  that each  of  said
attorneys-in-fact,  or his substitute or substitutes, may do or cause to be done
by virtue hereof.
 
    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/ EDWARD R. MCCRACKEN
    ---------------------------------       Chairman of the Board, and Chief Executive Officer       May 10, 1996
           Edward R. McCracken               (Principal Executive Officer)
 
            /s/ THOMAS A. JERMOLUK
    ---------------------------------       President, Chief Operating Officer and Director          May 10, 1996
            Thomas A. Jermoluk
 
              /s/ ROBERT R. BISHOP
    ---------------------------------       Chairman of the Board, Silicon Graphics World Trade      May 10, 1996
             Robert R. Bishop                Corporation and Director
 
           /s/ STANLEY J. MERESMAN
    ---------------------------------       Senior Vice President, Finance and Chief Financial       May 10, 1996
           Stanley J. Meresman               Officer (Principal Financial Officer)
 
             /s/ DENNIS P. MCBRIDE
    ---------------------------------       Vice President, Controller (Principal Accounting         May 10, 1996
            Dennis P. McBride                Officer)
</TABLE>
 
                                      II-4
<PAGE>
<TABLE>
<CAPTION>
                SIGNATURE                                          TITLE                               DATE
- ------------------------------------------  ---------------------------------------------------  ----------------
 
<C>                                         <S>                                                  <C>
             /s/ ALLEN F. JACOBSON
    ---------------------------------       Director                                                 May 10, 1996
            Allen F. Jacobson
 
            /s/ C. RICHARD KRAMLICH
    ---------------------------------       Director                                                 May 10, 1996
           C. Richard Kramlich
 
               /s/ ROBERT A. LUTZ
    ---------------------------------       Director                                                 May 10, 1996
              Robert A. Lutz
 
             /s/ JAMES A. MCDIVITT
    ---------------------------------       Director                                                 May 10, 1996
            James A. McDivitt
 
               /s/ LUCILLE SHAPIRO
    ---------------------------------       Director                                                 May 10, 1996
             Lucille Shapiro
 
    ---------------------------------       Director
            Robert B. Shapiro
 
              /s/ JAMES G. TREYBIG
    ---------------------------------       Director                                                 May 10, 1996
             James G. Treybig
</TABLE>
 
                                      II-5

<PAGE>
                                                                     EXHIBIT 5.1
 
                        [SHEARMAN & STERLING LETTERHEAD]
 
                                  May 9, 1996
 
SILICON GRAPHICS, INC.
2011 N. Shoreline Boulevard
Mountain View, California 94043-1389
 
Silicon Graphics, Inc.
Registration Statement on Form S-4
 
Ladies and Gentlemen:
 
As counsel to Silicon Graphics, Inc., a Delaware corporation (the "Company"), we
are  rendering this opinion  in connection with the  registration by the Company
pursuant to  the  above-referenced  Registration  Statement  on  Form  S-4  (the
"Registration  Statement") under the Securities Act  of 1933, as amended, of the
shares of the  Company's Common  Stock, $.001 par  value (the  "Shares"), to  be
issued  in connection with  the merger of C  Acquisition Corporation, a Delaware
corporation ("Merger  Sub"),  with and  into  Cray Research,  Inc.,  a  Delaware
corporation  ("Cray"), pursuant to an Agreement  and Plan of Merger (the "Merger
Agreement"), among the Company,  Merger Sub and Cray,  dated as of February  25,
1996.
 
As  such counsel  and in  connection with the  opinion expressed  below, we have
examined copies of the Registration  Statement, the Company's Restated  Articles
of  Incorporation dated November 7, 1994,  as amended, the Company's Amended and
Restated By-Laws, the  Merger Agreement,  certificates of  public officials  and
officers of the Company, and such other documents, instruments and records as we
have deemed necessary or appropriate as a basis for the opinion expressed below.
In  such examination,  we have  assumed the  genuineness of  all signatures, the
authenticity of all documents submitted to us as originals and the conformity to
original documents of all documents submitted to us as copies.
 
Based upon  the foregoing,  we are  of the  opinion that  the Shares  have  been
validly  authorized  and,  when  issued  pursuant to  the  terms  of  the Merger
Agreement, will be validly issued, fully paid and non-assessable.
 
We hereby consent to the use of  this opinion as an exhibit to the  Registration
Statement  and to the  reference to our  firm under the  caption "Legal Matters"
therein.
 
                                          Very truly yours,
 
                                          SHEARMAN & STERLING
 
MJK/SLC/LMM

<PAGE>
                                                                    EXHIBIT 23.2
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
    We  consent to the reference to our  firm under the caption "Experts" in the
Proxy Statement of Cray  Research, Inc. which is  made part of the  Registration
Statement (Form S-4) of Silicon Graphics, Inc. for the issuance of shares of its
common  stock and to the use of our  report dated July 19, 1995, with respect to
the consolidated financial statements of Silicon Graphics, Inc. incorporated  by
reference  in its Annual Report (Form 10-K) for the year ended June 30, 1995 and
the related  financial  statement  schedule  included  therein  filed  with  the
Securities and Exchange Commission.
 
                                          ERNST & YOUNG LLP
 
Palo Alto, California
May 9, 1996

<PAGE>
                                                                    EXHIBIT 23.3
 
                         INDEPENDENT AUDITORS' CONSENT
 
The Board of Directors
Cray Research, Inc.:
 
    We  consent to the  use in this Registration  Statement of Silicon Graphics,
Inc. on Form S-4 of  the report of our firm  dated January 24, 1996 relating  to
the consolidated financial statements of Cray Research, Inc. and subsidiaries as
of  December 31,  1995 and 1994,  and for  each of the  years in  the three year
period ended  December  31,  1995,  incorporated  by  reference  in  this  Proxy
Statement/  Prospectus  and  to the  reference  to  our firm  under  the heading
"Experts"  in  this  Proxy  Statement/   Prospectus,  which  is  part  of   this
Registration Statement.
 
                                          KPMG PEAT MARWICK LLP
 
Minneapolis, Minnesota
May 9, 1996

<PAGE>
                                                                    EXHIBIT 23.4
 
                        CONSENT OF SALOMON BROTHERS INC
 
    We  hereby consent to the inclusion of our opinion letter dated February 25,
1996 to the Board of Directors of Cray Research, Inc. ("Cray") as Annex B to the
Proxy Statement/Prospectus  relating to  the proposed  merger of  C  Acquisition
Corporation,  a wholly owned subsidiary of Silicon Graphics, Inc., with and into
Cray, and to the references to  such opinion in such Proxy  Statement/Prospectus
under the captions "Summary -- Recommendation; Fairness Opinion," "The Merger --
Background  of  the  Merger," "The  Merger  --  Cray's Reasons  for  the Merger;
Recommendation of the Cray Board" and "The Merger -- Opinion of Cray's Financial
Advisor." In giving such consent,  we do not admit and  we disclaim that we  are
experts  with  respect to  any part  of such  Registration Statement  within the
meaning of the term "expert" as used in, or that we come within the category  of
persons whose consent is required under Section 7 of the Securities Act of 1933,
as  amended, or the rules and regulations  issued by the Securities and Exchange
Commission thereunder.
 
                                          SALOMON BROTHERS INC
 
                                          By:          /s/ MICHAEL CARR
                                          --------------------------------------
                                                      Managing Director
 
                                          Date:           May 8, 1996
                                          --------------------------------------


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