----------------------------- OMB APPROVAL ----------------------------- OMB Number: 3235-0145 Expires: December 31, 2005 Estimated average burden hours per response........ 11 ----------------------------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (RULE 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (AMENDMENT NO. 1)* Encore Acquisition Company -------------------------------------------------------------------------------- (Name of Issuer) Common Stock -------------------------------------------------------------------------------- (Title of Class of Securities) 29255W100 ------------------------------------------------- (CUSIP Number) January 1, 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) [ ] 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). 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. SEC 1745 (3-98) SCHEDULE 13G ISSUER: Encore Acquisition Company CUSIP NO.: 29255W100 -------------------------------------------------------------------------------- 1. Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). J.P. Morgan Partners (SBIC), LLC (formerly known as Chase Venture Capital Associates, L.L.C.) 13-337-6808 ------------------------------------------------------------------------ -------------------------------------------------------------------------------- 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 Delaware --------------------------------- -------------------------------------------------------------------------------- 5. Sole Voting Power 6,866,643 ----------------------------- -------------------------------------------------------- 6. Shared Voting Power Not applicable. Number of Shares --------------------------- Beneficially -------------------------------------------------------- Owned by Each 7. Sole Dispositive Power 6,866,643 Reporting Person ------------------------ With: -------------------------------------------------------- 8. Shared Dispositive Power Not applicable. ---------------------- -------------------------------------------------------- -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 6,866,643 --------- -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ---------------------------------------------------------- -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 22.9% --------------------- -------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) -------------------------------------------------------------------------------- CO -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- SEC 1745 (3-98) SCHEDULE 13G ISSUER: Encore Acquisition Company CUSIP NO.: 29255W100 PRELIMINARY NOTE This amendment is being filed to reflect a change in the controlling persons of the Reporting Person. ITEM 1. (a) NAME OF ISSUER: Encore Acquisition Company (b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 777 Main Street Suite 1400 Fort Worth, Texas 76102 ITEM 2. (a) NAME OF PERSON FILING: J.P. Morgan Partners (SBIC), LLC Supplemental information relating to the ownership and control of the person filing this statement is included in Exhibit 2(a) attached hereto. (b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: 1221 Avenue of the Americas New York, New York 10020 (c) CITIZENSHIP: Delaware (d) TITLE OF CLASS OF SECURITIES (OF ISSUER): Common Stock (e) CUSIP NUMBER: 29255W100 ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SS. SS. 240. 13d-1(b) OR 240. 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: Not applicable. ITEM 4. OWNERSHIP (a) AMOUNT BENEFICIALLY OWNED: 6,866,643 (as of December 31, 2002) (b) PERCENT OF CLASS: 22.9% (as of December 31, 2002) SEC 1745 (3-98) SCHEDULE 13G ISSUER: Encore Acquisition Company CUSIP NO.: 29255W100 (C) NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS: (i) 6,866,643 (ii) Not applicable. (iii) 6,866,643 (iv) Not applicable. 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 SEC 1745 (3-98) SCHEDULE 13G ISSUER: Encore Acquisition Company CUSIP NO.: 29255W100 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 13, 2003 J.P. MORGAN PARTNERS (SBIC), LLC By: /s/ Jeffrey C. Walker ------------------------------ Name: Jeffrey C. Walker Title: President SEC 1745 (3-98)