-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, U7EPrBWOUXZB8jmBOJqd/obC4G0/d/LAUNgAyLZbQs6E910jXrbNzkPK1Ra+lRQh BeGHutSl5N0jdjZN2LNDDg== 0000927016-01-000913.txt : 20010223 0000927016-01-000913.hdr.sgml : 20010223 ACCESSION NUMBER: 0000927016-01-000913 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20010214 GROUP MEMBERS: BAB BIOVENTURES L.P. GROUP MEMBERS: BAB BIOVENTURES N.V. GROUP MEMBERS: BB BIOVENTURES L.P. GROUP MEMBERS: MEDICAL PORTFOLIO MANAGEMENT LLC GROUP MEMBERS: MPM ASSET MANAGEMENT INVESTORS 1998 LLC GROUP MEMBERS: MPM ASSET MANAGEMENT LLC GROUP MEMBERS: MPM BIOVENTURES I L.P. GROUP MEMBERS: MPM BIOVENTURES I LLC GROUP MEMBERS: MPM BIOVENTURES PARALLEL FUND GROUP MEMBERS: MPM CAPITAL L.P. GROUP MEMBERS: MPM CAPITAL LP SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: ARENA PHARMACEUTICALS INC CENTRAL INDEX KEY: 0001080709 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 232908305 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G SEC ACT: SEC FILE NUMBER: 005-59397 FILM NUMBER: 1543026 BUSINESS ADDRESS: STREET 1: 6166 NANCY RIDGE DR CITY: SAN DIEGO STATE: CA ZIP: 92121 BUSINESS PHONE: 8584537200 MAIL ADDRESS: STREET 1: 6166 NANCY RIDGE DR CITY: SAN DIEGO STATE: CA ZIP: 92121 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: MPM CAPITAL LP CENTRAL INDEX KEY: 0001134654 STANDARD INDUSTRIAL CLASSIFICATION: [] FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: ONE CAMBRIDGE CENTER CITY: CAMBRIDGE STATE: MA ZIP: 02142 BUSINESS PHONE: 6172257054 MAIL ADDRESS: STREET 1: ONE CAMBRIDGE CENTER CITY: CAMBRIDGE STATE: MA ZIP: 02142 SC 13G 1 0001.txt SCHEDULE 13G 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 13d-2(b) ARENA PHARMACEUTICALS, INC. - ------------------------------------------------------------------------------- (Name of Issuer) COMMON STOCK - ------------------------------------------------------------------------------- (Title of Class of Securities) 040047 10 2 - ------------------------------------------------------------------------------- (CUSIP Number) December 31, 2000 - ------------------------------------------------------------------------------- (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the one pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [ ] Rule 13d-1(c) [X ] Rule 13d-1(d) /1/ The remainder of this cover page shall be filled out for a reporting person's initial filing on this 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 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 (the "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. 040047 10 2 13G Page 2 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person MPM Capital L.P. - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 3 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person BB BioVentures L.P. - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 4 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person BAB BioVentures L.P. - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 5 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person MPM BioVentures Parallel Fund, L.P. - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b)X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 6 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person BAB BioVentures, N.V. - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Netherlands Antilles - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* CO - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 7 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person MPM BioVentures I, LP - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 8 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person MPM BioVentures I, LLC - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 9 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person MPM Asset Management LLC - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 10 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person Medical Portfolio Management, LLC - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! - --------------------- -------------------- CUSIP NO. 040047 10 2 13G Page 12 of 17 Pages - --------------------- -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. Identification No. Of Above Person MPM Asset Management Investors 1998 LLC - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) X - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware. - ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY OWNED 4,012,149 (1) BY EACH REPORTING PERSON WITH ---------------------------------------------------- 6 SHARED VOTING POWER None ---------------------------------------------------- 7 SOLE DISPOSITIVE POWER 4,012,149 (1) ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER None - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,012,149 (1) - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 17.69% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! STATEMENT ON SCHEDULE 13G Item 1(a). Name of Issuer: -------------- Arena Pharmaceuticals, Inc. Item 1(b). Address of Issuer's Principal Executive Offices: ----------------------------------------------- 6166 Nancy Ridge Drive, San Diego, CA 92121 Item 2(a). Names of Person Filing: ---------------------- MPM Capital L.P. BB BioVentures L.P. BAB BioVentures L.P. MPM BioVentures Parallel Fund, L.P. BAB BioVentures, N.V. MPM BioVentures I L.P. MPM BioVentures I LLC MPM Asset Management, LLC Medical Portfolio Management LLC MPM Asset Management 1998 LLC Item 2(b). Business Mailing Address for the Person Filing: ---------------------------------------------- c/o MPM Capital L.P. One Cambridge Center, 9th Floor Cambridge, MA 02142 Item 2(c). Citizenship: ----------- All entities were organized in Delaware, except BAB BioVentures, N.V., which was organized in the Netherlands Antilles. Item 2(d). Title of Class of Securities: ---------------------------- Common Stock Item 2(e). CUSIP Number: ------------ 040047 10 2 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d- -------------------------------------------------------------- 2(b), check whether the person filing is a: ------------------------------------------ Not Applicable Item 4. Ownership: --------- (a) Amount Beneficially Owned: 4,012,149 (1) (b) Percent of Class Owned: 17.69% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 4,012,149 shares of Common Stock (1) (ii) shared power to vote or to direct the vote: None (iii) sole power to dispose or to direct the disposition of: 4,012,149 shares of Common Stock (1) (iv) shared power to dispose or to direct the disposition of: None 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: --------------------------------------------------------------- Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares to which this statement relates. No one person's interest in such shares is more than five percent of the total outstanding stock of the Issuer. Item 7. Identification and Classification of the Subsidiary Which Acquired the ---------------------------------------------------------------------- Security Being Reported on By the Parent Holding Company: -------------------------------------------------------- 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. Certification: ------------- Not Applicable (1) Includes shares held through interests in MPM Capital L.P. ("MPM Capital") and in entities directly or indirectly controlled by it. MPM Capital is a direct or indirect parent and or a control person of MPM Asset Management LLC and funds managed or advised by it, and the general partners of such funds. Also includes shares held through interests in Medical Portfolio Management LLC, the general partner of MPM Capital. Among the shares included, 3,473,112 shares are held by MPM BioVentures L.P.; 497,310 shares are held by MPM BioVentures Parallel Fund, L.P.; and 41,727 shares are held by MPM Asset Management Investors 1998 LLC. Each reporting person herein disclaims beneficial ownership of shares not directly held by such reporting person. 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. Dated: February 14, 2001 MPM CAPITAL L.P. BB BIOVENTURES L.P. By: Medical Portfolio Management LLC, By: BAB BioVentures L.P., its General Partner its General Partner By: BAB BioVentures N.V., its General Partner By: /s/ Michael Steinmetz ------------------------------------------ Name: Michael Steinmetz By: /s/ Michael Steinmetz Title: Manager ------------------------- Name: Michael Steinmetz Title: Manager BAB BIOVENTURES L.P. MPM BIOVENTURES PARALLEL FUND, L.P. By: BAB BioVentures, N.V., By: MPM BioVentures I LP, its General Partner its General Partner By: /s/ Michael Steinmetz By: MPM BioVentures I LLC, ------------------------------------------ Name: Michael Steinmetz its General Partner Title: Manager By: /s/ Michael Steinmetz ------------------------- Name: Michael Steinmetz Title: Manager BAB BIOVENTURES, N.V. MPM BIOVENTURES I LP By: MPM BioVentures I LLC, its General Partner By: /s/ Michael Steinmetz ------------------------------------------ Name: Michael Steinmetz By: /s/ Michael Steinmetz Title: Manager -------------------------- Name: Michael Steinmetz Title: Manager
MPM BIOVENTURES I LLC MPM ASSET MANAGEMENT LLC By: /s/ Michael Steinmetz By: /s/ Michael Steinmetz ------------------------------------------ ------------------------- Name: Michael Steinmetz Name: Michael Steinmetz Title: Manager Title: Manager MEDICAL PORTFOLIO MANAGEMENT, LLC MPM ASSET MANAGEMENT 1998 LLC By: /s/ Michael Steinmetz By: /s/ Michael Steinmetz ------------------------------------------ --------------------------- Name: Michael Steinmetz Name: Michael Steinmetz Title: Manager Title: Manager
Signature In accordane with rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock of Arena Pharmaceuticals, Inc. and further agree that this agreement be included as an exhibit to such filing. Each party to the agreement expressly authorizes each other party to file on its behalf any and all amendments to such statement. Each party to this agreement agrees that this joint filing agreement may be signed in couterparts. For evidence whereof, the undersighed have caused this Agreement to be executed on their behalf this ___ day of February, 2001. MPM CAPITAL L.P. BB BIOVENTURES L.P. By: Medical Portfolio Management LLC, By: BAB BioVentures L.P., its General Partner its General Partner By: BAB BioVentures N.V., its General Partner By: /s/ Michael Steinmetz ------------------------------------------ Name: Michael Steinmetz By: /s/ Michael Steinmetz Title: Manager --------------------------- Name: Michael Steinmetz Title: Manager BAB BIOVENTURES L.P. MPM BIOVENTURES PARALLEL FUND, L.P. By: BAB BioVentures, N.V., By: MPM BioVentures I LP, its General Partner its General Partner By: /s/ Michael Steinmetz By: MPM BioVentures I LLC, ------------------------------------------ Name: Michael Steinmetz its General Partner Title: Manager By: /s/ Michael Steinmetz ------------------------- Name: Michael Steinmetz Title: Manager BAB BIOVENTURES, N.V. MPM BIOVENTURES I LP By: MPM BioVentures I LLC, its General Partner By: /s/ Michael Steinmetz ------------------------------------------ Name: Michael Steinmetz By: /s/ Michael Steinmetz Title: Manager -------------------------- Name: Michael Steinmetz Title: Manager
MPM BIOVENTURES I LLC MPM ASSET MANAGEMENT LLC By: /s/ Michael Steinmetz By: /s/ Michael Steinmetz ------------------------------------------ ------------------------ Name: Michael Steinmetz Name: Michael Steinmetz Title: Manager Title: Manager MEDICAL PORTFOLIO MANAGEMENT, LLC MPM ASSET MANAGEMENT 1998 LLC By: /s/ Michael Steinmetz By: /s/ Michael Steinmetz ------------------------------------------ ------------------------ Name: Michael Steinmetz Name: Michael Steinmetz Title: Manager Title: Manager
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