SC 13G 1 p14916_sc13g.txt FORM SC 13G United States Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 TheraSense Inc. -------------------------------------------------------------------------------- (Name of Issuer) Common Stock -------------------------------------------------------------------------------- (Title of Class of Securities) 883381 10 5 -------------------------------------------------------------------------------- (CUSIP Number) 12-31-2001 -------------------------------------------------------------------------------- (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [ ] Rule 13d-1(c) [X] Rule 13d-1(d) *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 22 pages CUSIP No. 883381 10 5 13G Page 2 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON InterWest Partners VI, 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 California -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 3,228,290 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 0 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 3,228,290 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,228,290 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 8.2% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 2 of 22 pages CUSIP No. 883381 10 5 13G Page 3 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON InterWest Investors VI, 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 California -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 101,217 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 0 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 101,217 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 101,217 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 3 of 22 pages CUSIP No. 883381 10 5 13G Page 4 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON InterWest Management Partners VI, LLC (the general partner of InterWest Partners VI, LP and InterWest Investors VI, 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 California -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 3,329,507 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 0 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 3,329,507 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,329,507 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 8.4% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 4 of 22 pages CUSIP No. 883381 10 5 13G Page 5 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON InterWest Partners VII, 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 California -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 1,449,082 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 0 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 1,449,082 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,449,082 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.7% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 5 of 22 pages CUSIP No. 883381 10 5 13G Page 6 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON InterWest Investors VII, 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 California -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 69,396 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 0 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 69,396 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 69,396 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.2% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 6 of 22 pages CUSIP No. 883381 10 5 13G Page 7 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON InterWest Management Partners VII, LLC (the general partner of InterWest Partners VII, LP and InterWest Investors VII, 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 California -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 1,518,478 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 0 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 1,518,478 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,518,478 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.8% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 7 of 22 pages CUSIP No. 883381 10 5 13G Page 8 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Stephen C. Bowsher (a Venture Member of InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 1,518,478 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 1,518,478 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,518,478 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.8% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 8 of 22 pages CUSIP No. 883381 10 5 13G Page 9 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Harvey B. Cash (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 11,764 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 4,847,985 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 11,764 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 4,847,985 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,859,749 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 9 of 22 pages CUSIP No. 883381 10 5 13G Page 10 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Alan W. Crites (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 2,000 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 4,847,985 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 2,000 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 4,847,985 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,849,985 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 10 of 22 pages CUSIP No. 883381 10 5 13G Page 11 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Philip T. Gianos (a Managing Director of InterWest Mangement Partners VI, LLC and InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 4,847,985 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 4,847,985 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,847,985 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 11 of 22 pages CUSIP No. 883381 10 5 13G Page 12 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON W. Scott Hedrick (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 21,764 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 4,847,985 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 21,764 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 4,847,985 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,869,749 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 12 of 22 pages CUSIP No. 883381 10 5 13G Page 13 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON W. Stephen Holmes (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 4,847,985 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 4,847,985 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,847,985 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 13 of 22 pages CUSIP No. 883381 10 5 13G Page 14 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Gilbert H. Kliman (a Venture Member of InterWest Management Partners VI, LLC and a Managing Director of InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 4,847,985 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 4,847,985 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,847,985 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 14 of 22 pages CUSIP No. 883381 10 5 13G Page 15 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Robert R. Momsen (a Managing Director of InterWest Management Partners VI, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 43,814 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 3,329,507 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 43,814 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 3,329,507 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,373,321 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 8.5% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 15 of 22 pages CUSIP No. 883381 10 5 13G Page 16 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Arnold L. Oronsky (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 4,847,985 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 4,847,985 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,847,985 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 16 of 22 pages CUSIP No. 883381 10 5 13G Page 17 of 22 Pages -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Thomas L. Rosch (a Managing Director of InterWest Management Partners VII, 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 United States -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 -------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 1,518,478 OWNED BY -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 1,518,478 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,518,478 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* |_| -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.8% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 17 of 22 pages Item 1. (a) Name of Issuer: TheraSense, Inc. ("Issuer") (b) Address of Issuer's Principal Executive Offices: 1360 South Loop Road Alameda, CA 94502 Item 2. (a) Name of Person(s) Filing: InterWest Partners VI, LP ("IWP VI") InterWest Investors VI, LP ("II VI") InterWest Management Partners VI, LLC ("IMP VI") InterWest Partners VII, LP ("IWP VII") InterWest Investors VII, LP ("II VII") InterWest Management Partners VII, LLC ("IMP VII") Stephen C. Bowsher ("Bowsher") Harvey B. Cash ("Cash") Alan W. Crites ("Crites") Philip T. Gianos ("Gianos") W. Scott Hedrick ("Hedrick") W. Stephen Holmes ("Holmes") Gilbert H. Kliman ("Kliman") Robert R. Momsen ("Momsen") Arnold L. Oronsky ("Oronsky") Thomas L. Rosch ("Rosch") (b) Address of Principal Business Office or, if none, Residence: 3000 Sand Hill Road Building 3, Suite 255 Menlo Park, CA 94025 (c) Citizenship/Place of Organization: IWP VI: California II VI: California IMP VI: California IWP VII: California II VII: California IMP VII: California Bowsher: United States Cash: United States Crites: United States Gianos: United States Hedrick: United States Holmes: United States Kliman: United States Momsen: United States Oronsky: United States Rosch: United States (d) Title of Class of Securities: Common Stock (e) CUSIP Number: 883381 10 5 Page 18 of 22 pages Item 3. Not applicable. Item 4. Ownership.

*Individuals included in this column are Gianos, Holmes, and Oronsky all of whom are Managing Directors of IMP VI and IMP VII. Also included in this column is Kliman who is a Venture Member of IMP VI and a Managing Director of IMP VII. **Momsen includes options exercisable through 3/1/02 representing 14,167 shares of common stock. 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 Under certain circumstances set forth in the partnership agreements of IMP VI and IMP VII, the general partners and/or limited partners of such partnerships have the right to receive dividends from, or the proceeds from the sale of, the Common Stock of Issuer beneficially owned by such Partnerships. Page 19 of 22 pages 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 No reporting person is a member of a group as defined in section 240.13d-1(b)(1)(iii)(H) of the Act. Item 9. Notice of Dissolution of Group Not applicable. Item 10. Certification Not applicable EXHIBITS A. Joint Filing Statement Page 20 of 22 pages 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. Date: February ____, 2002 INTERWEST PARTNERS VI, LP By: InterWest Management Partners VI, LLC -------------------------- Stephen C. Bowsher By: ----------------------------------- Managing Director -------------------------- Harvey B. Cash INTERWEST INVESTORS VI, LP -------------------------- By: InterWest Management Partners VI, LLC Alan W. Crites By: ----------------------------------- -------------------------- Managing Director Philip T. Gianos INTERWEST MANAGEMENT PARTNERS VI, LLC -------------------------- W. Scott Hedrick By: --------------------------------------- Managing Director -------------------------- W. Stephen Holmes -------------------------- Gilbert H. Kliman -------------------------- Robert R. Momsen INTERWEST PARTNERS VII, LP By: InterWest Management Partners VII, LLC -------------------------- Arnold L. Oronsky By: ---------------------------------- Managing Director -------------------------- Thomas L. Rosch INTERWEST INVESTORS VII, LP By: InterWest Management Partners VII, LLC By: ---------------------------------- Managing Director INTERWEST MANAGEMENT PARTNERS VII, LLC By: -------------------------------------- Managing Director Page 21 of 22 pages EXHIBIT A We, the undersigned, hereby express our agreement that the attached Schedule 13G is filed on behalf of each of us. Date: February ____, 2002 INTERWEST PARTNERS VI, LP By: InterWest Management Partners VI, LLC -------------------------- Stephen C. Bowsher By: ----------------------------------- Managing Director -------------------------- Harvey B. Cash INTERWEST INVESTORS VI, LP -------------------------- By: InterWest Management Partners VI, LLC Alan W. Crites By: ----------------------------------- -------------------------- Managing Director Philip T. Gianos INTERWEST MANAGEMENT PARTNERS VI, LLC -------------------------- W. Scott Hedrick By: --------------------------------------- Managing Director -------------------------- W. Stephen Holmes -------------------------- Gilbert H. Kliman -------------------------- Robert R. Momsen INTERWEST PARTNERS VII, LP By: InterWest Management Partners VII, LLC -------------------------- Arnold L. Oronsky By: ---------------------------------- Managing Director -------------------------- Thomas L. Rosch INTERWEST INVESTORS VII, LP By: InterWest Management Partners VII, LLC By: ---------------------------------- Managing Director INTERWEST MANAGEMENT PARTNERS VII, LLC By: -------------------------------------- Managing Director Page 22 of 22 pages

INTERWEST PARTNERS VI L P SC 13G