UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Information to be Included in Statements Filed Pursuant to Rules 13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to Rule 13d-2(b) Under the Securities Exchange Act of 1934 (Amendment No. __)* Open Solutions, Inc. -------------------------------------------------------------------------------- (Name of Issuer) Common Stock -------------------------------------------------------------------------------- (Title of Class of Securities) 68371P 10 2 -------------------------------------------------------------------------------- (CUSIP Number) December 31, 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). ================================================ ======================= CUSIP NO. 68371P 10 2 13G Page 2 of 13 Pages ================================================ ======================= ============= ========================================================================================================= 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Axiom Venture Partners, L.P. 06-1392421 ------------- --------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ------------- --------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------------- --------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ================================================ ======= ============================================================== 5 SOLE VOTING POWER NUMBER OF SHARES 682,046 ------- -------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER 0 OWNED BY ------- -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER 682,046 REPORTING ------- -------------------------------------------------------------- PERSON WITH 8 SHARED DISPOSITIVE POWER 0 ============ ========================================================================================================== 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 682,046 ------------ ---------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] ------------ ---------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 4.1% ------------ ---------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN ============ ========================================================================================================== *SEE INSTRUCTIONS BEFORE FILLING OUT! ================================================ ======================= CUSIP NO. 68371P 10 2 13G Page 3 of 13 Pages ================================================ ======================= ============= ========================================================================================================= 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Axiom Venture Associates, L.P. 06-1392419 ------------- --------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ------------- --------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------------- --------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ================================================ ======= ============================================================== 5 SOLE VOTING POWER NUMBER OF SHARES 682,046 ------- -------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER 0 OWNED BY ------- -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER 682,046 REPORTING ------- -------------------------------------------------------------- PERSON WITH 8 SHARED DISPOSITIVE POWER 0 ============ ========================================================================================================== 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 682,046 ------------ ---------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] ------------ ---------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 4.1% ------------ ---------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN ============ ========================================================================================================== *SEE INSTRUCTIONS BEFORE FILLING OUT! ================================================ ======================= CUSIP NO. 68371P 10 2 13G Page 4 of 13 Pages ================================================ ======================= ============= ========================================================================================================= 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Axiom Venture Partners III, L.P. 06-1580669 ------------- --------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ------------- --------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------------- --------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ================================================ ======= ============================================================== 5 SOLE VOTING POWER NUMBER OF SHARES 235,294 ------- -------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER 0 OWNED BY ------- -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER 235,294 REPORTING ------- -------------------------------------------------------------- PERSON WITH 8 SHARED DISPOSITIVE POWER 0 ============ ========================================================================================================== 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 235,294 ------------ ---------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] ------------ ---------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.4% ------------ ---------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN ============ ========================================================================================================== *SEE INSTRUCTIONS BEFORE FILLING OUT! ================================================ ======================= CUSIP NO. 68371P 10 2 13G Page 5 of 13 Pages ================================================ ======================= ============= ========================================================================================================= 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Axiom Venture Associates III, L.P. 06-1580668 ------------- --------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ------------- --------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------------- --------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ================================================ ======= ============================================================== 5 SOLE VOTING POWER NUMBER OF SHARES 235,294 ------- -------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER 0 OWNED BY ------- -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER 235,294 REPORTING ------- -------------------------------------------------------------- PERSON WITH 8 SHARED DISPOSITIVE POWER 0 ============ ========================================================================================================== 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 235,294 ------------ ---------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] ------------ ---------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.4% ------------ ---------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN ============ ========================================================================================================== *SEE INSTRUCTIONS BEFORE FILLING OUT! ================================================ ======================= CUSIP NO. 68371P 10 2 13G Page 6 of 13 Pages ================================================ ======================= ============= ========================================================================================================= 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Axiom Venture Advisors, Inc. 06-1392417 ------------- --------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ------------- --------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------------- --------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Connecticut ================================================ ======= ============================================================== 5 SOLE VOTING POWER NUMBER OF SHARES 235,094 ------- -------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER 0 OWNED BY ------- -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER 235,094 REPORTING ------- -------------------------------------------------------------- PERSON WITH 8 SHARED DISPOSITIVE POWER 0 ============ ========================================================================================================== 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 235,094 ------------ ---------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] ------------ ---------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.4% ------------ ---------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* CO ============ ========================================================================================================== *SEE INSTRUCTIONS BEFORE FILLING OUT! ================================================ ======================= CUSIP NO. 68371P 10 2 13G Page 7 of 13 Pages ================================================ ======================= ============= ========================================================================================================= 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Alan M. Mendelson ------------- --------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ------------- --------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------------- --------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION UNITED STATES ================================================ ======= ============================================================== 5 SOLE VOTING POWER NUMBER OF SHARES 0 ------- -------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER 917,340 OWNED BY ------- -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER 0 REPORTING ------- -------------------------------------------------------------- PERSON WITH 8 SHARED DISPOSITIVE POWER 917,340 ============ ========================================================================================================== 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 917,340 ------------ ---------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] ------------ ---------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 5.5% ------------ ---------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN ============ ========================================================================================================== *SEE INSTRUCTIONS BEFORE FILLING OUT! ================================================ ======================= CUSIP NO. 68371P 10 2 13G Page 8 of 13 Pages ================================================ ======================= ============= ========================================================================================================= 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Samuel F. McKay ------------- --------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ------------- --------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------------- --------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION UNITED STATES ================================================ ======= ============================================================== 5 SOLE VOTING POWER NUMBER OF SHARES 0 ------- -------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER 917,340 OWNED BY ------- -------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER 0 REPORTING ------- -------------------------------------------------------------- PERSON WITH 8 SHARED DISPOSITIVE POWER 917,340 ============ ========================================================================================================== 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 917,340 ------------ ---------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] ------------ ---------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 5.5% ------------ ---------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN ============ ========================================================================================================== *SEE INSTRUCTIONS BEFORE FILLING OUT! Item 1(a). Name of Issuer: Open Solutions, Inc. Item 1(b). Address of Issuer's Principal Executive Offices: 300 Winding Brook Drive Glastonbury, CT 06033 Item 2(a). Name of Person Filing: Axiom Venture Partners, L.P. ("AVP") Axiom Venture Associates, L.P. ("AVA") Axiom Venture Partners III, L.P. ("AVPIII") Axiom Venture Associates III, L.P. ("AVAIII") Axiom Venture Advisors, Inc. ("AV Advisors") Alan M. Mendelson ("Mendelson") Samuel F. McKay ("McKay") Item 2(b). Address of Principal Business Office or, if None, Residence: Cityplace II - 17th Floor 185 Asylum Street Hartford, CT 06103 Item 2(c). Citizenship: Entities: AVP -- Delaware AVA -- Delaware AVPIII -- Delaware AVAIII -- Delaware AV Advisors -- Connecticut Individuals: Mendelson -- United States McKay -- United States Item 2(d). Title of Class of Securities: Common Stock Item 2(e). CUSIP Number: 68371P 10 2 Page 9 of 13 pages Item 3. If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a: NOT APPLICABLE (a) [ ] Broker or dealer registered under Section 15 of the Exchange Act. (b) [ ] Bank as defined in Section 3(a)(6) of the Exchange Act. (c) [ ] Insurance company as defined in Section 3(a)(19) of the Exchange Act. (d) [ ] Investment company registered under Section 8 of the Investment Company Act. (e) [ ] An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E). (f) [ ] An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F). (g) [ ] A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G). (h) [ ] A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act. (i) [ ] A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act. (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J). If this statement is filed pursuant to Rule 13d-1(c), check this box. [ ] 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. Page 10 of 13 pages ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- AV AVP AVA AVPIII AVAIII Advisors Mendelson McKay ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- (a) Amount 682,046 682,046 235,294 235,294 235,294 917,340 917,340 Beneficially Owned ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- (b) Percent of Class (%) 4.1 4.1 1.4 1.4 1.4 5.5 5.5 ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- (c) (i) Sole Voting 682,046 682,046 235,294 235,294 235,294 0 0 Power ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- (ii) Shared 0 0 0 0 0 917,340 917,340 Voting Power ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- (iii) Sole 682,046 682,046 235,294 235,294 235,294 0 0 Dispositive Power ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- (iv) Shared 0 0 0 0 0 917,340 917,340 Dispositive Power ----------- -------------- ---------- ----------- ---------- ----------- ----------- ------------- ---------- Item 5. Ownership of Five Percent or Less of a Class If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ]. 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 Page 11 of 13 pages Item 9. Notice of Dissolution of Group NOT APPLICABLE Item 10. Certification 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 17, 2004 AXIOM VENTURE PARTNERS, L.P. AXIOM VENTURE PARTNERS III, L.P. By: Axiom Venture Associates, L.P. By: Axiom Venture Associates III, L.P. ------------------------------ ---------------------------------- Its general partner Its general partner By: /s/ Alan M. Mendelson By: /s/ Axiom Venture Advisors, Inc. -------------------------- ---------------------------------- General Partner Its general partner By: /s/ Alan M. Mendelson ------------------------------ Chief Executive Officer AXIOM VENTURE ASSOCIATES, L.P. AXIOM VENTURE ASSOCIATES III, L.P. By: /s/ Alan M. Mendelson By: /s/ Axiom Venture Advisors, Inc. ------------------------------- ---------------------------------- General Partner Its general partner By: /s/ Alan M. Mendelson ---------------------------------- Chief Executive Officer /s/ Alan M. Mendelson AXIOM VENTURE ADVISORS, INC. ---------------------- Alan M. Mendelson By: /s/ Alan M. Mendelson ---------------------------------- Chief Executive Officer /s/ Samuel F. McKay ---------------------- Samuel F. McKay EXHIBITS A: Joint Filing Statement EXHIBIT A AGREEMENT OF JOINT FILING We, the undersigned, hereby express our agreement that the attached Schedule 13G is filed on behalf of us. Date: February 17, 2004 Page 12 of 13 pages AXIOM VENTURE PARTNERS, L.P. AXIOM VENTURE PARTNERS III, L.P. By: Axiom Venture Associates, L.P. By: Axiom Venture Associates III, L.P. ------------------------------ ---------------------------------- Its general partner Its general partner By: /s/ Alan M. Mendelson By: /s/ Axiom Venture Advisors, Inc. -------------------------- ---------------------------------- General Partner Its general partner By: /s/ Alan M. Mendelson ------------------------------ Chief Executive Officer AXIOM VENTURE ASSOCIATES, L.P. AXIOM VENTURE ASSOCIATES III, L.P. By: /s/ Alan M. Mendelson By: /s/ Axiom Venture Advisors, Inc. ------------------------------- ---------------------------------- General Partner Its general partner By: /s/ Alan M. Mendelson ---------------------------------- Chief Executive Officer /s/ Alan M. Mendelson AXIOM VENTURE ADVISORS, INC. ---------------------- Alan M. Mendelson By: /s/ Alan M. Mendelson ---------------------------------- Chief Executive Officer /s/ Samuel F. McKay ---------------------- Samuel F. McKay Page 13 of 13 pages