SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ------------ Under the Securities Exchange Act of 1934 SCHEDULE 13G INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Biotransplant Incorporated -------------------------- (Name of Issuer) Common Stock ------------ (Title of Class of Securities) 09066Y107 --------- (CUSIP Number) December 10, 2002 ----------------- (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) |X| Rule 13d-1(c) [ ] Rule 13d-1(d) --------- Page 1 of 13 Pages SCHEDULE 13G CUSIP No. 09066Y107 Page 2 of 13 Pages -------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Dickstein & Co., L.P. -------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) |X| See Exhibit 2 -------------------------------------------------------------------------------- 3) SEC USE ONLY -------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware -------------------------------------------------------------------------------- NUMBER 5) SOLE VOTING POWER OF SHARES 1,192,200 BENEFICIALLY ---------------------------------------------------------- OWNED BY 6) SHARED VOTING POWER EACH REPORTING Not Applicable PERSON ---------------------------------------------------------- WITH 7) SOLE DISPOSITIVE POWER 1,192,200 ---------------------------------------------------------- 8) SHARED DISPOSITIVE POWER Not Applicable -------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,192,200 -------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] -------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.7% -------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON PN -------------------------------------------------------------------------------- -2- SCHEDULE 13G CUSIP No. 09066Y107 Page 3 of 13 Pages -------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Dickstein International Limited -------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) |X| See Exhibit 2 -------------------------------------------------------------------------------- 3) SEC USE ONLY -------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION British Virgin Islands -------------------------------------------------------------------------------- NUMBER 5) SOLE VOTING POWER OF SHARES 130,000 BENEFICIALLY ---------------------------------------------------------- OWNED BY 6) SHARED VOTING POWER EACH REPORTING Not Applicable PERSON ---------------------------------------------------------- WITH 7) SOLE DISPOSITIVE POWER 130,000 ---------------------------------------------------------- 8) SHARED DISPOSITIVE POWER Not Applicable -------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 130,000 -------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] -------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.5% (see Item 4) -------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON CO -------------------------------------------------------------------------------- -3- SCHEDULE 13G CUSIP No. 09066Y107 Page 4 of 13 Pages -------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Dickstein Partners, L.P. -------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) |X| See Exhibit 2 -------------------------------------------------------------------------------- 3) SEC USE ONLY -------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware -------------------------------------------------------------------------------- NUMBER 5) SOLE VOTING POWER OF SHARES Not Applicable BENEFICIALLY ---------------------------------------------------------- OWNED BY 6) SHARED VOTING POWER EACH REPORTING 1,192,200 PERSON ---------------------------------------------------------- WITH 7) SOLE DISPOSITIVE POWER Not Applicable ---------------------------------------------------------- 8) SHARED DISPOSITIVE POWER 1,192,200 -------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,192,200 -------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] -------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.7% -------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON PN -------------------------------------------------------------------------------- -4- SCHEDULE 13G -------------------------------------------------------------------------------- CUSIP No. 09066Y107 Page 5 of 13 Pages -------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Dickstein Partners Inc. -------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ]> (b) |X| See Exhibit 2 -------------------------------------------------------------------------------- 3) SEC USE ONLY -------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware -------------------------------------------------------------------------------- NUMBER 5) SOLE VOTING POWER OF SHARES Not Applicable BENEFICIALLY ---------------------------------------------------------- OWNED BY 6) SHARED VOTING POWER EACH REPORTING 1,322,200 PERSON ---------------------------------------------------------- WITH 7) SOLE DISPOSITIVE POWER Not Applicable ---------------------------------------------------------- 8) SHARED DISPOSITIVE POWER 1,322,200 -------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,322,200 -------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] -------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% -------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON CO -------------------------------------------------------------------------------- -5- SCHEDULE 13G -------------------------------------------------------------------------------- CUSIP No. 09066Y107 Page 6 of 13 Pages -------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Mark Dickstein -------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) |X| See Exhibit 2 -------------------------------------------------------------------------------- 3) SEC USE ONLY -------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION United States -------------------------------------------------------------------------------- NUMBER 5) SOLE VOTING POWER OF SHARES 190,000 BENEFICIALLY ---------------------------------------------------------- OWNED BY 6) SHARED VOTING POWER EACH REPORTING 1,322,200 PERSON ---------------------------------------------------------- WITH 7) SOLE DISPOSITIVE POWER 190,000 ---------------------------------------------------------- 8) SHARED DISPOSITIVE POWER 1,322,200 -------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,512,200 -------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] -------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 6.0% -------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- -6- Schedule 13G ------------ Item 1(a). Name of Issuer: Biotransplant Incorporated Item 1(b). Address of Issuer's Principal Executive Offices: Charleston Navy Yard Building 75, Third Avenue Charlestown, MA 02129 Item 2(a). Name of Person Filing: Dickstein & Co., L.P. ("Dickstein & Co.") Dickstein International Limited ("Dickstein International") Dickstein Partners, L.P. ("DPLP") Dickstein Partners Inc. ("DPI") Mark Dickstein ("Dickstein") Item 2(b). Address of Principal Business Office or, if None, Residence: Dickstein & Co., DPLP, DPI and Dickstein : 660 Madison Avenue, 16th Floor, New York, NY 10021 Dickstein International: 129 Front Street, Hamilton HM 12 Bermuda Item 2(c). Citizenship: Dickstein & Co., DPLP and DPI: Delaware Dickstein International: British Virgin Islands Dickstein: United States Item 2(d). Title of Class of Securities: Common Stock Item 2(e). CUSIP Number: 09066Y107 Item 3. If this statement is filed pursuant to ss.ss.240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a: Not Applicable -7- Item 4. Ownership.(1) (See Exhibit 2) Dickstein & Co: --------------- (a) Amount beneficially owned: 1,192,200 shares (b) Percent of class: 4.7% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 1,192,200 shares (ii) Shared power to vote or to direct the vote: Not Applicable (iii) Sole power to dispose or to direct the disposition of: 1,192,200 shares (iv) Shared power to dispose or to direct the disposition of: Not Applicable Dickstein International ----------------------- (a) Amount beneficially owned: 130,000 shares (b) Percent of class: 0.5% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 130,000 shares (ii) Shared power to vote or to direct the vote: Not Applicable (iii) Sole power to dispose or to direct the disposition of: 130,000 shares (iv) Shared power to dispose or to direct the disposition of: Not Applicable DPLP ---- (a) Amount beneficially owned: 1,192,200 shares (b) Percent of class: 4.7% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: Not Applicable (ii) Shared power to vote or to direct the vote: 1,192,200 shares (iii) Sole power to dispose or to direct the disposition of: Not Applicable -------------------- (1) Percentages based upon 25,385,998 shares of Common Stock outstanding as of November 14, 2002, as reported by the Issuer in its Form 10-Q for the quarter ended September 30, 2002. -8- (iv) Shared power to dispose or to direct the disposition of: 1,192,200 DPI:(2) ----- (a) Amount beneficially owned: 1,322,200 shares (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: Not Applicable (ii) Shared power to vote or to direct the vote: 1,322,200 shares (iii) Sole power to dispose or to direct the disposition of: Not Applicable (iv) Shared power to dispose or to direct the disposition of: 1,322,200 shares Dickstein: ---------- (a) Amount beneficially owned: 1,512,200 shares (b) Percent of class: 6.0% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 190,000 shares (ii) Shared power to vote or to direct the vote: 1,322,200 shares (iii) Sole power to dispose or to direct the disposition of: 190,000 shares (iv) Shared power to dispose or to direct the disposition of: 1,322,200 shares Item 5. Ownership of Five Percent or Less of a Class. Not applicable 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. --------------------- (2) Edward Farr, a Vice President of DPI, owns 7,000 shares of Common Stock. Mr. Farr possesses the sole power to vote and dispose of the Common Stock owned by him and is not acting together with the reporting persons in the manner contemplated by Rule 13d-5b of the Securities Exchange Act of 1934. -9- Not applicable Item 8. Identification and Classification of Members of the Group. See Exhibit 1, Agreement of Joint Filing pursuant to Rule 13d(1)-f promulgated under the Securities Exchange Act of 1934. See also Exhibit 2. Item 9. Notice of Dissolution of Group. Not applicable Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect. -10- SIGNATURE After reasonable inquiry and to the best knowledge and belief of the undersigned, the undersigned certifies that the information set forth in this Statement is true, complete and correct. December 18, 2002 Date DICKSTEIN & CO., L.P. By: Leigh Waxman, as Vice President of Dickstein Partners Inc., the general partner of Dickstein Partners, L. P., the general partner of Dickstein & Co., L.P. /s/ Leigh Waxman -------------------------------- Name: Leigh Waxman DICKSTEIN INTERNATIONAL LIMITED By: Leigh Waxman, as Vice President of Dickstein Partners Inc., the agent of Dickstein International Limited /s/ Leigh Waxman ------------------------------- Name: Leigh Waxman DICKSTEIN PARTNERS, L.P. By: Leigh Waxman, as Vice President of Dickstein Partners Inc., the general partner of Dickstein Partners, L. P. /s/ Leigh Waxman ------------------------------- Name: Leigh Waxman DICKSTEIN PARTNERS INC. By: Leigh Waxman, as Vice President /s/ Leigh Waxman ------------------------------- Name: Leigh Waxman MARK DICKSTEIN /s/ Mark Dickstein ------------------ Name: Mark Dickstein -11- EXHIBIT 1 AGREEMENT OF JOINT FILING Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, the undersigned persons hereby agree to file with the Securities and Exchange Commission the Statement on Schedule 13G (the "Statement") to which this Agreement is attached as an exhibit, and agree that such Statement, as so filed, is filed on behalf of each of them. IN WITNESS WHEREOF, the undersigned have executed this agreement as of December 18, 2002. DICKSTEIN & CO., L.P. By: Leigh Waxman, as Vice President of Dickstein Partners Inc., the general partner of Dickstein Partners, L. P., the general partner of Dickstein & Co., L.P. /s/ Leigh Waxman ---------------------------------- Name: Leigh Waxman DICKSTEIN INTERNATIONAL LIMITED By: Leigh Waxman, as Vice President of Dickstein Partners Inc., the agent of Dickstein International Limited /s/ Leigh Waxman ---------------------------------- Name: Leigh Waxman DICKSTEIN PARTNERS, L.P. By: Leigh Waxman, as Vice President of Dickstein Partners Inc., the general partner of Dickstein Partners, L. P. /s/ Leigh Waxman ---------------------------------- Name: Leigh Waxman DICKSTEIN PARTNERS INC. By: Leigh Waxman, as Vice President /s/ Leigh Waxman ---------------------------------- Name: Leigh Waxman MARK DICKSTEIN /s/ Mark Dickstein ------------------ Name: Mark Dickstein -12- EXHIBIT 2 Dickstein is the President and sole shareholder and director of DPI. DPI is the general partner of DPLP and advisor to Dickstein International. DPLP is the general partner of Dickstein & Co. Consequently, the Reporting Persons may be deemed to be members of a group. By reason of its position as general partner of Dickstein & Co., DPLP may be deemed to possess the power to vote and dispose of the shares of Common Stock beneficially owned by Dickstein & Co. By reason of its position as general partner of DPLP and advisor to Dickstein International, DPI may be deemed to possess the power to vote and dispose of the shares of Common Stock beneficially owned by Dickstein & Co. and Dickstein International. By reason of his position as president and sole director of DPI, Dickstein may be deemed to possess the power to vote and dispose of the shares of Common Stock beneficially owned by Dickstein & Co. and Dickstein International. Pursuant to rule 13d-4 promulgated under the Securities Exchange Act of 1934, as amended, (i) Dickstein & Co. disclaims beneficial ownership of all shares of Common Stock beneficially owned by Dickstein International, (ii) Dickstein International disclaims beneficial ownership of all shares of Common Stock beneficially owned by Dickstein & Co. and (iii) each of DPLP, DPI and Dickstein disclaims beneficial ownership of all shares of Common Stock beneficially owned by Dickstein & Co. and Dickstein International, except to the extent of their actual economic interests. -13-