SEC 1745 (6-01) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. OMB APPROVAL OMB Number: 3235-0145 Expires: October 31, 2002 Estimated average burden hours per response . . . 14.9 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. __________)* THERASENSE, INC. --------------------------------------------------------------------------- (Name of Issuer) COMMON STOCK --------------------------------------------------------------------------- (Title of Class of Securities) 883381105 --------------------------------------------------------------------------- (CUSIP Number) December 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). CUSIP No. 883381105 --------------------------------------------------------------------------- 1. Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). E. HELLER & CO. 74-2612486 --------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) [ ] (b) [ ] --------------------------------------------------------------------------- 3. SEC Use Only --------------------------------------------------------------------------- 4. Citizenship or Place of Organization TEXAS --------------------------------------------------------------------------- 5. Sole Voting Power 3,129,375 -------------------------------------------------------- Number of 6. Shared Voting Power Shares 0 Beneficially Owned by -------------------------------------------------------- Each 7. Sole Dispositive Power Reporting 3,129,375 Person With -------------------------------------------------------- 8. Shared Dispositive Power 0 --------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 3,129,375 --------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] --------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (11) 7.9% --------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) CO --------------------------------------------------------------------------- SEE INSTRUCTIONS FOR SCHEDULE 13G Item 1. (a) Name of Issuer THERASENSE, INC. (b) Address of Issuer's Principal Executive Offices 1360 South Loop Road Alameda, CA 94502 Item 2. (a) Name of Person Filing E. HELLER & COMPANY (b) Address of Principal Business Office or, if none, Residence 6114 LaSalle Avenue #427 Oakland, CA 94611 (c) Citizenship TEXAS (d) Title of Class of Securities COMMON STOCK (e) CUSIP Number 883381105 Item 3. NOT APPLICABLE Item 4. Ownership Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. (a) Amount beneficially owned: SEE ITEM 9 OF THE COVER PAGE. (b) Percent of class: SEE ITEM 11 OF COVER PAGE. (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote (ii) Shared power to vote or to direct the vote (iii) Sole power to dispose or to direct the disposition of (iv) Shared power to dispose or to direct the disposition of SEE ITEMS 5, 6, 7 AND 8 OF THE COVER PAGE. Item 5. Ownership of Five Percent or Less of a Class NOT APPLICABLE Item 6. Ownership of More than Five Percent on Behalf of Another Person. NOT APPLICABLE Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company 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 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. February 14, 2002 Date /s/ EPHRAIM HELLER Signature EPHRAIM HELLER, PRESIDENT Name/Title