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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-A


                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



                                 SYNOPSYS, INC.
             (Exact name of Registrant as specified in its charter)


          DELAWARE                                          56-154236
(State of incorporation or organization)    (I.R.S. Employer Identification No.)


                            700 EAST MIDDLEFIELD ROAD
                      MOUNTAIN VIEW, CALIFORNIA 94043-4033
               (Address of principal executive offices) (Zip Code)




SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

   TITLE OF EACH CLASS                      NAME OF EACH EXCHANGE ON WHICH
   TO BE SO REGISTERED                      EACH CLASS IS TO BE REGISTERED
          NONE                                            NONE

IF THIS FORM RELATES TO THE REGISTRATION OF A CLASS OF SECURITIES PURSUANT TO
SECTION 12(b) OF THE EXCHANGE ACT AND IS EFFECTIVE PURSUANT TO GENERAL
INSTRUCTION A.(c)(1), CHECK THE FOLLOWING BOX. [ ]

IF THIS FORM RELATES TO THE REGISTRATION OF A CLASS OF SECURITIES PURSUANT TO
SECTION 12(g) OF THE EXCHANGE ACT AND IS EFFECTIVE PURSUANT TO GENERAL
INSTRUCTION A.(d), CHECK THE FOLLOWING BOX. [X]

SECURITIES ACT REGISTRATION STATEMENT FILE NUMBER TO WHICH THIS FORM RELATES:
NOT APPLICABLE.

SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                         PREFERRED SHARE PURCHASE RIGHTS
                                (Title of Class)



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Item 1.  Description of Registrant's Securities to be Registered.

         On September 3, 1997, the Board of Directors of Synopsys, Inc. (the
"Company") declared a dividend of one right (a "Right") to purchase one
one-thousandth share of the Company's Series A Participating Preferred Stock
("Series A Preferred") for each outstanding share of Common Stock, $0.01 par
value per share ("Common Shares"), of the Company. Pursuant to such resolutions,
the Company has entered into a Preferred Shares Rights Agreement (the "Rights
Agreement") with BankBoston N.A., as Rights Agent (the "Rights Agent"), dated
October 24, 1997. The dividend is payable on November 10, 1997 (the "Record
Date") to stockholders of record as of the close of business on that day. Each
Right entitles the registered holder to purchase from the Company one
one-thousandth of a share of Series A Preferred at an exercise price of $175.00
(the "Purchase Price"), subject to adjustment.

         The following summary of the principal terms of the Rights Agreement is
a general description only and is subject to the detailed terms and conditions
of the Rights Agreement. A copy of the Rights Agreement is attached as Exhibit 1
to this Registration Statement and is incorporated herein by reference.

Rights Evidenced by Common Share Certificates

         The Rights will not be exercisable until the Distribution Date (defined
below). Certificates for the Rights ("Rights Certificates") will not be sent to
stockholders and the Rights will attach to and trade only together with the
Common Shares. Accordingly, Common Share certificates outstanding on the Record
Date will evidence the Rights related thereto, and Common Share certificates
issued after the Record Date will contain a notation incorporating the Rights
Agreement by reference. Until the Distribution Date (or earlier redemption or
expiration of the Rights), the surrender or transfer of any certificates for
Common Shares, outstanding as of the Record Date, even without notation or a
copy of the Summary of Rights being attached thereto, will also constitute the
transfer of the Rights associated with the Common Shares represented by such
certificate.

Distribution Date

         The Rights will separate from the Common Shares, Rights Certificates
will be issued and the Rights will become exercisable upon the earlier of: (i)
ten days following the first date of a public announcement by the Company or an
Acquiring Person (as defined below) that an Acquiring Person has become such
(the "Shares Acquisition Date") or (ii) ten business days (or such later date as
may be determined by the Board of Directors) following the commencement of, or
announcement of an intention to make, a tender offer or exchange offer, the
consummation of which would result in a person or group becoming an Acquiring
Person. The earlier of such dates is referred to as the "Distribution Date." A
person or group of affiliated or associated persons that beneficially owns, or
has the right to acquire beneficial ownership of, 15% or more of the outstanding
Common Shares is referred to as an "Acquiring Person."



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Issuance of Rights Certificates; Expiration of Rights

        As soon as practicable following the Distribution Date, separate Rights
Certificates will be mailed to holders of record of the Common Shares as of the
close of business on the Distribution Date and such separate Rights Certificates
alone will evidence the Rights from and after the Distribution Date. The Rights
will expire on the earliest of (i) October 24, 2007 (the "Final Expiration
Date") or (ii) redemption or exchange of the Rights as described below.

Initial Exercise of the Rights

        Following the Distribution Date, and until one of the further events
described below, holders of the Rights will be entitled to receive, upon
exercise and the payment of the Purchase Price, one one-thousandth of a share of
the Series A Preferred.

Right to Buy Company Common Shares

        Unless the Rights are earlier redeemed, in the event that a person
becomes an Acquiring Person (a "Triggering Event"), then proper provision will
be made so that each holder of a Right which has not theretofore been exercised
(other than Rights beneficially owned by the Acquiring Person or any affiliate
of the Acquiring Person, which will thereafter be void) will thereafter have the
right to receive, upon exercise, Common Shares having a value equal to two times
the Purchase Price. In the event that the Company does not have sufficient
Common Shares available for all Rights to be exercised, or the Board decides
that such action is necessary and not contrary to the interests of Rights
holders, the Company may instead substitute cash, assets or other securities for
the Common Shares for which the Rights would have been exercisable.

Right to Buy Acquiring Company Stock

        Similarly, unless the Rights are earlier redeemed, in the event that,
after a Triggering Event, (i) the Company is acquired in a merger or other
business combination transaction, or (ii) 50% or more of the Company's
consolidated assets or earning power are sold (other than in transactions in the
ordinary course of business), proper provision must be made so that each holder
of a Right which has not theretofore been exercised (other than Rights
beneficially owned by the Acquiring Person or any affiliate of the Acquiring
Person, which will thereafter be void) will thereafter have the right to
receive, upon exercise, shares of common stock of the acquiring company having a
value equal to two times the Purchase Price.

Exchange Provision

        At any time after a Triggering Event and prior to the acquisition by any
person or entity of beneficial ownership of 50% or more of the Company's
outstanding Common Shares, the Board of Directors of the Company may exchange
the Rights (other than Rights owned by the Acquiring Person), in whole or in
part, at an exchange ratio of one Common Share per Right.



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Redemption

        At any time on or prior to the close of business on the earlier of (i)
the Shares Acquisition Date and (ii) the Final Expiration Date of the Rights,
the Company may redeem the Rights in whole, but not in part, at a price of $0.01
per Right.

Adjustments to Prevent Dilution

        The Purchase Price payable, the number of Rights, and the number of
Series A Preferred or Common Shares or other securities or property issuable
upon exercise of the Rights are subject to adjustment from time to time in
connection with the dilutive issuances by the Company as set forth in the Rights
Agreement. With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price.

Cash Paid Instead of Issuing Fractional Shares

        No fractional portion less than integral multiples of one Common Share
or one one-thousandth of a share of Series A Preferred will be issued upon
exercise of a Right and, in lieu thereof, an adjustment in cash will be made
based on the market price of the security to be so issued on the last trading
date prior to the date of exercise.

No Stockholders' Rights Prior to Exercise

        Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company (other than any rights resulting from
such holder's ownership of Common Shares), including, without limitation, the
right to vote or to receive dividends.

Amendment of Rights Agreement

        The provisions of the Rights Agreement may be supplemented or amended by
the Board of Directors in any manner prior to the Distribution Date. After such
date, the provisions of the Rights Agreement may be amended by the Board in
order to cure any ambiguity, defect or inconsistency, to make changes which do
not adversely affect the interests of holders of Rights (excluding the interests
of any Acquiring Person), or to shorten or lengthen any time period under the
Rights Agreement; provided, however, that no amendment to adjust the time period
governing redemption shall be made at such time as the Rights are not
redeemable.

Rights and Preferences of the Series A Preferred

        Series A Preferred purchasable upon exercise of the Rights will not be
redeemable. Each share of Series A Preferred will be entitled to an aggregate
dividend of 1,000 times the dividend declared per Common Share. In the event of
liquidation, the holders of the Series A Preferred will be entitled to 1,000
times the amount paid per Common Share plus an amount equal to accrued and
unpaid dividends



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and distributions thereon, whether or not declared, to the date of such payment.
Each share of Series A Preferred will have 1,000 votes, voting together with the
Common Shares. These rights are protected by customary anti-dilution provisions.

        Because of the nature of the dividend, liquidation and voting rights of
the shares of Series A Preferred, the value of the one one-thousandth interest
in a share of Series A Preferred purchasable upon exercise of each Right should
approximate the value of one Common Share.

Certain Anti-takeover Effects

        The Rights approved by the Company's Board of Directors are designed to
protect and maximize the value of the outstanding equity interests in the
Company in the event of an unsolicited attempt by an acquiror to take over the
Company, in a manner or on terms not approved by the Company's Board of
Directors. Takeover attempts frequently include coercive tactics to deprive the
Company's Board of Directors and its stockholders of any real opportunity to
determine the destiny of the Company. The Rights dividend has been declared by
the Company's Board of Directors 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 unfairly pressure stockholders,
squeeze them out of their investment without giving them any real choice and
deprive them of the full value of their shares.

        The Rights are not intended to prevent a takeover of the Company and
will not do so. The Rights may be redeemed by the Company at $0.01 per Right
within ten days after the accumulation of 15% or more of the Company's shares by
a single acquiror or group. Accordingly, the Rights should not interfere with
any merger or business combination approved by the Company's Board of Directors.

        Issuance of the Rights does not in any way weaken the financial strength
of the Company or interfere with its business plans. The issuance of the Rights
themselves has no dilutive effect, will not affect reported earnings per share,
should not be taxable to the Company or to its stockholders, and will not change
the way in which the Company's shares are presently traded. The Company's Board
of Directors believes that the Rights represent a sound and reasonable means of
addressing the complex issues of corporate policy created by the current
takeover environment.

        However, the Rights may have the effect of rendering more difficult or
discouraging an acquisition of the Company deemed undesirable by its Board of
Directors. The Rights may cause substantial dilution to a person or group that
attempts to acquire the Company on terms or in a manner not approved by the
Company's Board of Directors, except pursuant to an offer conditioned upon the
negation, purchase or redemption of the Rights.



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Item 2.  Exhibits.

         1.       Preferred Shares Rights Agreement, dated as of October 24,
                  1997 between Synopsys, Inc. and BankBoston, N.A., including
                  the form of Certificate of Designation, the form of Rights
                  Certificate and the Summary of Rights attached thereto as
                  Exhibits A, B and C, respectively.

         2.       Third Amended and Restated Certificate of Incorporation of
                  Synopsys, Inc.(1)

         3.       Certificate of Amendment of Restated Certificate of
                  Incorporation of Synopsys, Inc.(2)

         4.       Bylaws of Synopsys, Inc., as amended.(3)

(1)   Incorporated by reference to Exhibit 3.1 to the Company's Registration
      Statement on Form S-4 filed on February 5, 1997.

(2)   Incorporated by reference to Exhibit 3.2 to the Company's Registration
      Statement on Form S-4 filed on February 5, 1997.

(3)   Incorporated by reference to Exhibit 3.3 to the Company's Registration
      Statement on Form S-4 filed on February 5, 1997.



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                                    SIGNATURE

        Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934, the registrant has duly caused this registration statement to be
signed on its behalf by the undersigned, thereto duly authorized.

                                       SYNOPSYS, INC.


Date: October 29, 1997
                                       By: _______________________________
                                           Steven K. Shevick


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                                   EXHIBIT INDEX



      EXHIBIT
         NO.                           EXHIBIT
      -------                          -------
               
         1        Preferred Shares Rights Agreement, dated as of October 24,
                  1997 between Synopsys, Inc. and BankBoston, N.A., including
                  the Certificate of Determination, the form of Rights
                  Certificate and the Summary of Rights attached thereto as
                  Exhibits A, B and C, respectively.

         2.       Third Amended and Restated Certificate of Incorporation of
                  Synopsys, Inc.(1)

         3.       Certificate of Amendment of Restated Certificate of
                  Incorporation of Synopsys, Inc.(2)

         4.       Bylaws of Synopsys, Inc., as amended.(3)



(1)   Incorporated by reference to Exhibit 3.1 to the Company's Registration
      Statement on Form S-4 filed on February 5, 1997.

(2)   Incorporated by reference to Exhibit 3.2 to the Company's Registration
      Statement on Form S-4 filed on February 5, 1997.

(3)   Incorporated by reference to Exhibit 3.3 to the Company's Registration
      Statement on Form S-4 filed on February 5, 1997.



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