SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ___________________ SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. ___)/1/ Integrated Circuit Systems, Inc. -------------------------------------------------------------------------------- (Name of Issuer) Common Stock, par value $0.01 per share -------------------------------------------------------------------------------- (Title of Class of Securities) 45811K 20 8 -------------------------------------------------------------------------------- (CUSIP Number) December 31, 2000 -------------------------------------------------------------------------------- (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [_] Rule 13d-1(b) ----------------- [_] Rule 13d-1(c) ----------------- [X] Rule 13d-1(d) ----------------- _________________ Page 1 of 9 Pages _______________ /1/ 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 disclosures provided in a prior cover page. The information required in 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 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). CUSIP NO. 4581 13G Page 2 of 9 Pages ------------------------------------------------------------------------------ NAMES OF REPORTING PERSONS. 1 BEAR STEARNS MB 1998-1999 PRE-FUND, LLC I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) 2 (a) [_] (b) [x] ------------------------------------------------------------------------------ SEC USE ONLY 3 ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 4 Delaware ------------------------------------------------------------------------------ SOLE VOTING POWER 5 NUMBER OF 9,095,265 (see Item 4) SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 6 OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 7 REPORTING 9,095,265 (see Item 4) PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 8 ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9 9,095,265 (see Item 4) ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 10 (SEE INSTRUCTIONS) [_] ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 11 14.2% ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) 12 00 ------------------------------------------------------------------------------ CUSIP NO. 4581 13G Page 2 of 9 Pages ------------------------------------------------------------------------------ NAMES OF REPORTING PERSONS. 1 THE BEAR STEARNS COMPANIES INC. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) 2 (a) [_] (b) [x] ------------------------------------------------------------------------------ SEC USE ONLY 3 ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 4 Delaware ------------------------------------------------------------------------------ SOLE VOTING POWER 5 NUMBER OF 9,095,265 (see Item 4) SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 6 OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 7 REPORTING 9,095,265 (see Item 4) PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 8 ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9 9,095,265 (see Item 4) ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 10 (SEE INSTRUCTIONS) [_] ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 11 14.2% ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) 12 HC ------------------------------------------------------------------------------ SCHEDULE 13G ITEM 1(A). NAME OF ISSUER: Integrated Circuit Systems, Inc. ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 2435 Boulevard of the Generals Norristown, PA 19403 ITEM 2(A). NAME OF PERSON FILING: This Statement is being jointly filed by each of the following persons pursuant to Rule 13d-1(f) promulgated by the Securities and Exchange Commission pursuant to Section 13 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"): (i) Bear Stearns MB 1998-1999 Pre-Fund, LLC (the "Pre-Fund"), a Delaware limited liability company, by virtue of its direct beneficial ownership of shares of common stock, par value $0.01 per share (the "Common Stock"), of the Issuer; and (ii) The Bear Stearns Companies Inc. ("BSC"), a Delaware corporation, as the managing member of the Pre-Fund. The Pre-Fund and BSC are collectively referred herein as the "Reporting Persons." The Reporting Persons have entered into a Joint Filing Agreement, a copy of which is filed with this statement as Exhibit A (which is incorporated herein by reference), pursuant to which the Reporting Persons have agreed to file this statement jointly in accordance with the provisions of Rule 13d-1(f)(1) under the Exchange Act. The Reporting Persons may be deemed to constitute a "group" for purposes of Section 13(d)(3) of the Exchange Act. The Reporting Persons expressly disclaim that they have agreed to act as a group other than as described in this Statement. ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: The address of the principal business office of each of the Reporting Persons is The Bear Stearns Companies Inc., 245 Park Avenue, New York, New York 10167. ITEM 2(C). CITIZENSHIP: The Pre-Fund is a limited liability company organized under the laws of the State of Delaware, and BSC is a corporation organized under the laws of the State of Delaware. ITEM 2(D). TITLE OF CLASS OF SECURITIES: Common Stock, par value $0.01 per share. ITEM 2(E). CUSIP NO.: 45811K 20 8 ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS: (a) [_] a broker or dealer registered under section 15 of the Act (15 U.S.C. 78o); (b) [_] a bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c); (c) [_] an insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c); (d) [_] an investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8); (e) [_] an investment adviser in accordance with (S)240.13d-1(b)(1)(ii)(E); (f) [_] an employee benefit plan or endowment fund in accordance with (S)240.13d-1(b)(1)(ii)(F); (g) [_] a parent holding company or control person in accordance with (S) 240.13d-1(b)(1)(ii)(G); (h) [_] a savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) [_] a church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3); or (j) [_] a Group, in accordance with (S)240.13d- 1(b)(1)(ii)(J). Not applicable. ITEM 4. OWNERSHIP. (A)-(C). Each Reporting Person named in response to Item 2 hereof has, as of December 31, 2000, sole or shared power to vote or to direct the vote and sole or shared power to dispose or to direct the disposition of the Common Stock as follows: (i) As of the date hereof, the Pre-Fund has the sole power to vote and to dispose of 9,095,265 shares of Common Stock currently held by the Pre-Fund, constituting approximately 14.2% of the outstanding Common Stock issued and outstanding as of January ., 2001, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2000 (the "Quarterly Report"). (ii) BSC, as the managing member of the Pre-Fund, may be deemed to share voting and dispositive power with respect to 9,095,265 shares of Common Stock currently held by the Pre-Fund, representing approximately 14.2% of the total number of outstanding shares of Common Stock as reported in the Quarterly Report. The filing of this Statement by BSC shall not be construed as an admission that BSC is, for the purpose of Section 13(d) of the Exchange Act, the beneficial owner of such shares held by the Pre-Fund. ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. If this statement is being filed to report the fact that as of the date hereof each of the Reporting Persons has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [_]. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. Not applicable. ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY OR CONTROL PERSON. Not applicable. ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. Not applicable. ITEM 9. NOTICE OF DISSOLUTION OF GROUP. Not applicable. ITEM 10. CERTIFICATIONS. Not applicable. SIGNATURE After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct. Date: February 12, 2001 BEAR STEARNS MB 1998-1999 PRE-FUND, LLC By: The Bear Stearns Companies Inc. By: /s/ Mark E. Lehman __________________________________ Name: Mark E. Lehman Title: Executive Vice President THE BEAR STEARNS COMPANIES INC. By: /s/ Mark E. Lehman __________________________________ Name: Mark E. Lehman Title: Executive Vice President EXHIBIT A AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G _____________________ The undersigned hereby agree as follows: (i) Each of them is individually eligible to use the Schedule 13G to which this Exhibit is attached, and such Schedule 13G is filed on behalf of each of them; and (ii) each of them is responsible for the timely filing of such Schedule 13G and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate. Date: February 12, 2001 BEAR STEARNS MB 1998-1999 PRE-FUND, LLC By: The Bear Stearns Companies Inc. By: /s/ Mark E. Lehman ------------------------------------ Name: Mark E. Lehman Title: Executive Vice President THE BEAR STEARNS COMPANIES INC. By: /s/ Mark E. Lehman ------------------------------------ Name: Mark E. Lehman Title: Executive Vice President