SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 --------- SCHEDULE 13D Amendment No. 4 (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) Medarex, Inc. ------------------------------------------------------------------------------ (Name of Issuer) COMMON STOCK, par value $0.01 ------------------------------------------------------------------------------ (Title of Class of Securities) 583916-10-1 -------------------------------------------------------------------------------- CUSIP Number BCC Acquisition I LLC c/o Bay City Capital LLC 750 Battery Street Suite 600 San Francisco, California 94111 (415) 676-3830 with a copy to: Timothy G. Hoxie, Esq. Heller Ehrman White & McAuliffe LLP 333 Bush Street San Francisco, California 94104 (415) 772-6052 -------------------------------------------------------------------------------- (Name, address and telephone number of person authorized to receive notices and communications) November 7, 2001 ---------------- (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 that is the subject of this Schedule 13D, and is filing this statement because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box: [_] (Continued on following pages) (Page 1 of 9 Pages) SCHEDULE 13D CUSIP NO. 583916-10-1 PAGE 2 OF 9 PAGES ----------- Amendment No. 4 ------------------------------------------------------------------------------ 1 NAME OF REPORTING PERSONS BCC Acquisition I LLC ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 2 (a) [_] (b) [X] ------------------------------------------------------------------------------ SEC USE ONLY 3 ------------------------------------------------------------------------------ SOURCE OF FUNDS 4 WC, AF ------------------------------------------------------------------------------ CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [_] 5 ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 6 Delaware ------------------------------------------------------------------------------ SOLE VOTING POWER 7 NUMBER OF 0 SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 8 3,791,346 shares OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 9 REPORTING 0 PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 10 3,791,346 shares ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11 3,791,346 shares ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 12 [_] ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 13 5.21% ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON 14 OO ------------------------------------------------------------------------------ SCHEDULE 13D CUSIP NO. 583916-10-1 PAGE 3 OF 9 PAGES ----------- Amendment No. 4 ------------------------------------------------------------------------------ 1 NAME OF REPORTING PERSONS The Bay City Capital Fund I, L.P. ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 2 (a) [_] (b) [X] ------------------------------------------------------------------------------ SEC USE ONLY 3 ------------------------------------------------------------------------------ SOURCE OF FUNDS 4 WC, AF ------------------------------------------------------------------------------ CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [_] 5 ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 6 Delaware ------------------------------------------------------------------------------ SOLE VOTING POWER 7 NUMBER OF 0 SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 8 3,791,346 shares OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 9 REPORTING 0 PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 10 3,791,346 shares ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11 3,791,346 shares ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 12 [_] ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 13 5.21% ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON 14 OO ------------------------------------------------------------------------------ SCHEDULE 13D CUSIP NO. 583916-10-1 PAGE 4 OF 9 PAGES ----------- Amendment No. 4 ------------------------------------------------------------------------------ 1 NAME OF REPORTING PERSONS Bay City Capital Management LLC ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 2 (a) [_] (b) [X] ------------------------------------------------------------------------------ SEC USE ONLY 3 ------------------------------------------------------------------------------ SOURCE OF FUNDS 4 WC, AF ------------------------------------------------------------------------------ CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [_] 5 ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 6 Delaware ------------------------------------------------------------------------------ SOLE VOTING POWER 7 NUMBER OF 0 SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 8 3,791,346 shares OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 9 REPORTING 0 PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 10 3,791,346 shares ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11 3,791,346 shares ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 12 [_] ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 13 5.21% ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON 14 OO ------------------------------------------------------------------------------ SCHEDULE 13D CUSIP NO. 583916-10-1 PAGE 5 OF 9 PAGES ----------- Amendment No. 4 ------------------------------------------------------------------------------ 1 NAME OF REPORTING PERSONS Bay City Capital LLC ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 2 (a) [_] (b) [X] ------------------------------------------------------------------------------ SEC USE ONLY 3 ------------------------------------------------------------------------------ SOURCE OF FUNDS 4 WC, AF ------------------------------------------------------------------------------ CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [_] 5 ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 6 Delaware ------------------------------------------------------------------------------ SOLE VOTING POWER 7 NUMBER OF 0 SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 8 3,791,346 shares OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 9 REPORTING 0 PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 10 3,791,346 shares ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11 3,791,346 shares ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 12 [_] ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 13 5.21% ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON 14 OO ------------------------------------------------------------------------------ CUSIP NO. 583916-10-1 SCHEDULE 13D PAGE 6 OF 9 PAGES ----------- Amendment No. 4 INTRODUCTION BCC Acquisition I LLC, a Delaware limited liability company ("BCC Acquisition"), hereby files this Amendment No. 4 (the "Amendment") to the Statement on Schedule 13D (the "Statement") on behalf of the Reporting Persons (as defined under Item 2 of the Statement) identified herein pursuant to the Agreement with Respect to Schedule 13D attached to the Statement as Exhibit 7(1). Defined terms not otherwise defined herein are deemed to have the same definition as ascribed thereto in the Statement. Only those Items amended are reported herein. Item 4. Purpose of Transaction. ---------------------- Item 4 is amended by adding the following paragraph at the end thereof: In a series of open market transactions on the NASDAQ occurring on October 31, 2000 through December 19, 2000, BCC Acquisition disposed of an aggregate of 462,000 shares of the Common Stock of the Issuer at an average sales price of approximately $54.75 per share. The total funds received by BCC Acquisition in these transactions was $25,294,754.80 (before broker commissions). In a series of open market transactions occurring October 16, 2001 through November 8, 2001, BCC Acquisition disposed of an aggregate of 1,000,000 shares of the Common Stock of the Issuer at an average sales price of approximately $20.73 per share. The total funds received by BCC Acquisition in these transactions was $20,731,941.51 (before broker commissions). A table identifying the sales occurring within the last sixty days is included in Item 5(c) of this Amendment. BCC Acquisition presently intends to hold its remaining shares for investment, but reserves the right to sell additional shares, or acquire additional shares, from time to time. CUSIP NO. 583916-10-1 SCHEDULE 13D PAGE 7 of 9 PAGES ----------- Amendment No. 4 Item 5. Interest in Securities of the Issuer. ------------------------------------- Item 5, paragraphs (a) and (b), is amended to read as follows: (a) and (b) The aggregate number of Shares and percentage of Common Stock of the Issuer (based upon Issuer's report on Form 10-Q for the quarter ending June 30, 2001, that it had 72,740,966 shares of Common Stock outstanding as of August 3, 2001) beneficially owned by each person named in Item 2, as well as the number of Shares of Common Stock as to which such person is deemed to have sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or direct the disposition, in each case after giving effect to the transactions described in Item 4 of this Amendment, is set forth in the following table. ========================================================================================================= Reporting Person No. of Shares Percentage Power to Vote Power to Dispose Beneficially of Class Owned Shared Sole Shared Sole --------------------------------------------------------------------------------------------------------- BCC Acquisition I 3,791,346 5.21% 3,791,346 3,791,346 -------------------------------------------------------------------------------------------------------- BCC Fund I, L.P. 3,791,346 5.21% 3,791,346 3,791,346 -------------------------------------------------------------------------------------------------------- BCC Management LLC 3,791,346 5.21% 3,791,346 3,791,346 -------------------------------------------------------------------------------------------------------- BCC LLC 3,791,346 5.21% 3,791,346 3,791,346 -------------------------------------------------------------------------------------------------------- The information required by Item 5 with respect to persons with whom voting or dispositive power is shared is set forth in Item 2 of the Statement. CUSIP NO. 583916-10-1 SCHEDULE 13D PAGE 8 of 9 PAGES ----------- Amendment No. 4 (c) To the best knowledge of the Reporting Persons, no person described in paragraph (a) of this Item 5 has effected any transaction in the Common Stock of the Issuer during the past 60 days other than as set forth in the table below: Date Seller # Shares Price Total Funds Received ----------------------------------------------------------------------------------------------------- 10/16/01 BCC Acquisition 185,000 $20.1314 $ 3,724,299.94 ----------------------------------------------------------------------------------------------------- 10/17/01 BCC Acquisition 2,500 20.5 51,250.00 ----------------------------------------------------------------------------------------------------- 10/23/01 BCC Acquisition 20,000 20.0875 401,750.00 ----------------------------------------------------------------------------------------------------- 10/25/01 BCC Acquisition 70,600 20.7837 1,467,329.22 ----------------------------------------------------------------------------------------------------- 10/26/01 BCC Acquisition 80,800 21.6624 1,750,321.92 ----------------------------------------------------------------------------------------------------- 10/29/01 BCC Acquisition 21,000 21.1592 444,343.20 ----------------------------------------------------------------------------------------------------- 10/30/01 BCC Acquisition 47,400 20.1899 957,001.26 ----------------------------------------------------------------------------------------------------- 10/31/01 BCC Acquisition 98,300 20.3622 2,001,604.26 ----------------------------------------------------------------------------------------------------- 11/1/01 BCC Acquisition 53,000 20.2332 1,072,359.60 ----------------------------------------------------------------------------------------------------- 11/2/01 BCC Acquisition 12,000 20.4442 245,330.40 ----------------------------------------------------------------------------------------------------- 11/5/01 BCC Acquisition 42,500 20.2861 862,159.25 ----------------------------------------------------------------------------------------------------- 11/6/01 BCC Acquisition 37,500 20.3324 762,465.00 ----------------------------------------------------------------------------------------------------- 11/7/01 BCC Acquisition 240,800 20.8217 5,013,865.36 ----------------------------------------------------------------------------------------------------- 11/8/01 BCC Acquisition 88,600 22.3235 1,977,862.10 ----------------------------------------------------------------------------------------------------- TOTAL 1,000,000 $20,731,941.51 --------- -------------- ----------------------------------------------------------------------------------------------------- (d) To the best knowledge of the Reporting Persons, no persons other than the Reporting Persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Stock of the Issuer held by the Reporting Persons. A response to Item 5(c) is added as follows: Other than the transactions described in Item 4 of this Amendment, there have been no transactions by the Reporting Persons in the Issuer's Common Stock since the date of filing of Amendment No. 3 to the Statement, dated October 4, 2000. CUSIP NO. 583916-10-1 SCHEDULE 13D PAGE 9 OF 9 PAGES ----------- Amendment No. 4 SIGNATURE After reasonable inquiry and to the best of the undersigned's knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct. DATED: November 9, 2001 BCC Acquisition I LLC By: Its Manager The Bay City Capital Fund I, L.P. By: Its General Partner Bay City Capital Management LLC By: /s/ Fred B. Craves --------------------- Name: Fred B. Craves Its: Manager and Managing Director