-------------------------- OMB APPROVAL -------------------------- OMB Number: 3235-0145 Expires: December 31, 2005 Estimated average burden hours per response......11 -------------------------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ------------ SCHEDULE 13G (Amendment No. 5)* 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) RIGEL PHARMACEUTICALS, INC. - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 766559108 - -------------------------------------------------------------------------------- (CUSIP Number) April 29, 2003 - -------------------------------------------------------------------------------- (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) * 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 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). Page 1 of 18 pages CUSIP No. 766559108 Page 2 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta Partners - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & Footnote 1 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & Footnote 1 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 1------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* IA - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 1: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 3 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta Partners II, Inc. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A and Footnote 2 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A and Footnote 2 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 2------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* IA - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 2: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 4 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta California Partners, 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 - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & Footnote 3 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & Footnote 3 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 3------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 3: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 5 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta California Management Partners, 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 - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & Footnote 4 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & Footnote 4 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 4------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 4: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 6 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta Embarcadero Partners, 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 California - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & footnote 5 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & footnote 5 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 5------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* CO - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 5: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 7 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta BioPharma Partners II, 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 - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & Footnote 6 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & Footnote 6 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 6------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 6: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 8 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta BioPharma Management Partners II, 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 - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & footnote 7 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & footnote 7 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 7------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* CO - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 7: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 9 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alta Embarcadero BioPharma Partners II, 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 - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & footnote 8 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & footnote 8 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,210,601 - ------------------------Please see Attachment A and Footnote 8------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* CO - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 8: Includes the 1,950,184 shares of Common Stock and Warrants to purchase 260,417 shares of Common Stock held by the funds affiliated with Alta Partners and Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 10 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Farah Champsi - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 1,481,943 BENEFICIALLY Please see Attachment A & footnote 9 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 1,481,943 Please see Attachment A & footnote 9 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,481,943 - ------------------------Please see Attachment A and Footnote 9------------------ 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.3% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* IN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 9: Includes the 1,256,249 shares of Common Stock and Warrants to purchase 225,694 shares of Common Stock held by the funds affiliated with Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 11 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Jean Deleage - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER 2,779 -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 2,210,601 BENEFICIALLY Please see Attachment A & footnote 10 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 2,779 WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,210,601 Please see Attachment A & footnote 10 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,213,380 - ------------------------Please see Attachment A and Footnote 10----------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 16.8% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* IN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 10: Includes the 1,950,184 shares of Common Stock, Warrants to purchase 260,417 shares of Common Stock, and Stock Options for 2,779 shares of Common Stock. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 12 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Garrett Gruener - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 728,658 BENEFICIALLY Please see Attachment A & footnote 11 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 728,658 Please see Attachment A & footnote 11 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 728,658 - ------------------------Please see Attachment A and Footnote 11----------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.5% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* IN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 11: Includes the 693,935 shares of Common Stock and Warrants to purchase 34,723 shares of Common Stock held by the funds affiliated with Alta Partners. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 13 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Alix Marduel - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 1,481,943 BENEFICIALLY Please see Attachment A & footnote 12 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 1,481,943 Please see Attachment A & footnote 12 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,481,943 - ------------------------Please see Attachment A and Footnote 12----------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.3% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* IN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 12: Includes the 1,256,249 shares of Common Stock and Warrants to purchase 225,694 shares of Common Stock held by the funds affiliated with Alta Partners II. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. CUSIP No. 766559108 Page 14 of 18 Pages - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Guy Nohra - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- Please see Attachment A 5 SOLE VOTING POWER -0- -------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 728,658 BENEFICIALLY Please see Attachment A & footnote 13 OWNED BY -------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON -0- WITH -------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 728,658 Please see Attachment A & footnote 13 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 728,658 - ------------------------Please see Attachment A and Footnote 13----------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.5% - --------------------------Please see Attachment A------------------------------- 12 TYPE OF REPORTING PERSON* IN - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Footnote 13: Includes the 693,935 shares of Common Stock and Warrants to purchase 34,723 shares of Common Stock held by the funds affiliated with Alta Partners. These numbers reflect the 1:9 Reverse Stock Split that was effective 6/26/03. See Attachment A. Item 1. (a) Name of Issuer: Rigel Pharmaceuticals, Inc. ("Issuer") (b) Address of Issuer's Principal Executive Offices: 1180 Veterans Boulevard South San Francisco, CA 94080 Item 2. (a) Name of Person Filing: Alta Partners ("AP") Alta Partners II, Inc. ("AP II") Alta California Partners, L.P. ("ACP") Alta California Management Partners, L.P. ("ACMP") Alta Embarcadero Partners, LLC ("AEP") Alta BioPharma Partners II, L.P. ("ABP II") Alta BioPharma Management Partners II, LLC ("ABMP II") Alta Embarcadero BioPharma Partners II, LLC ("AEBP II") Farah Champsi ("FC") Jean Deleage ("JD") Garrett Gruener ("GG") Alix Marduel ("AM") Guy Nohra ("GN") (b) Address of Principal Business Office: One Embarcadero Center, Suite 4050 San Francisco, CA 94111 (c) Citizenship/Place of Organization: Entities: AP California AP II California ACP Delaware ACMP Delaware AEP California ABP II Delaware ABMP II Delaware AEBP II California Individuals: FC United States JD United States GG United States AM United States GN United States (d) Title of Class of Securities: Common Stock (e) CUSIP Number: 766559108 Item 3. Not applicable. Item 4. Ownership. Please see Attachment A