INTEGRATED SYSTEMS INC
SC 13D/A, 1999-11-04
PREPACKAGED SOFTWARE
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                 SCHEDULE 13D/A

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                               (AMENDMENT NO. 1)*


                             Integrated Systems, Inc.
                             ------------------------
                                (Name of Issuer)


                                  Common Stock
                                  ------------
                         (Title of Class of Securities)

                                   45812M104
                                   ---------
                                 (CUSIP Number)

                               Richard W. Kraber
                           Wind River Systems, Inc.
                    500 Wind River Way, Alameda, CA 94501
                                (510) 748-4100
                                --------------
          (Name, Address and Telephone Number of Person Authorized to
                    Receive Notices and Communications)


                               October 21, 1999
                               ----------------
           (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the following
box [_].

Note: Six copies of this statement, including all exhibits, should be filed
with the Commission. See Rule 13d-1(a) for other parties to whom copies are
to be sent.

* The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934, as amended (the "Exchange Act") or otherwise subject to the
liabilities of that section of the Exchange Act but shall be subject to all
other provisions of the Exchange Act.


<PAGE>

CUSIP No. 45812M104

1     NAME OF REPORTING PERSON

Wind River Systems, Inc.

S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

94-2873391

2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

      (a) [_]          (b) [_]

3     SEC USE ONLY

4     SOURCE OF FUNDS

OO

5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) [_]

6     CITIZENSHIP OR PLACE OF ORGANIZATION

State of Delaware

NUMBER OF                7              SOLE VOTING POWER
SHARES                                      2,383,151
BENEFICIALLY
OWNED BY                 8             SHARED VOTING POWER
EACH                                         6,267,115
REPORTING
PERSON                   9            SOLE DISPOSITIVE POWER
                                             2,383,151

                        10           SHARED DISPOSITIVE POWER
                                             6,267,115


11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

8,650,266 shares

12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES

[_]

13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

32.16%

14   TYPE OF REPORTING PERSON

CO

Neither the filing of this amendment nor any of its contents shall be deemed
to constitute an admission by Wind River Systems, Inc. that it is the
beneficial owner of any of the Common Stock referred to herein for purposes
of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for
any other purpose, and such beneficial ownership is expressly disclaimed.

<PAGE>

This Amendment No. 1 amends the Statement on Schedule 13D filed with the
Securities and Exchange Commission on November 1, 1999 by Wind River Systems,
Inc (the "Schedule 13D") with respect to shares of common stock of Integrated
Systems, Inc.  This Amendment No. 1 is being filed to correct the aggregate
number of shares of common stock of Integrated Systems beneficially owned by
each reporting person, as previously reported in Item 11 of the cover page to
the Schedule 13D.  The correct aggregate number of shares beneficially owned
by each reporting person is 8,650,266.

                                   SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete
and correct.

Date:     November 3, 1999     WIND RIVER SYSTEMS, INC.

                               By: /s/ Richard W. Kraber
                                   ---------------------

                                   Richard W. Kraber
                                   Vice President, Chief Financial Officer




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