-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, CCZncHAHT3sjMW5uE4a2jn5b98+YcD/iau05CFX9me/7dho6T8/yGSBgSFUCM+KO 6G1Qa4hafxEMtoBoh6Wl3Q== 0000950135-99-000714.txt : 19990215 0000950135-99-000714.hdr.sgml : 19990215 ACCESSION NUMBER: 0000950135-99-000714 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 3 FILED AS OF DATE: 19990212 GROUP MEMBERS: BRUCE R. EVANS GROUP MEMBERS: E. ROE STAMPS, IV GROUP MEMBERS: GREGORY M. AVIS GROUP MEMBERS: JOHN A. GENEST GROUP MEMBERS: JOSEPH F. TRUSTEY GROUP MEMBERS: MARTIN J. MANNION GROUP MEMBERS: STAMPS, WOODSUM & CO. IV GROUP MEMBERS: STEPHEN G. WOODSUM GROUP MEMBERS: SUMMIT INVESTORS II, L.P. GROUP MEMBERS: SUMMIT PARTNERS IV, L.P. GROUP MEMBERS: SUMMIT VENTURES IV LP GROUP MEMBERS: THOMAS S. ROBERTS GROUP MEMBERS: WALTER G. KORTSCHAK SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: AMERICAN DENTAL PARTNERS INC CENTRAL INDEX KEY: 0001028087 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-MISC HEALTH & ALLIED SERVICES, NEC [8090] IRS NUMBER: 043297858 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G SEC ACT: SEC FILE NUMBER: 005-55325 FILM NUMBER: 99535344 BUSINESS ADDRESS: STREET 1: 301 EDGEWATER PLACE STREET 2: SUITE 320 CITY: WAKEFIELD STATE: MA ZIP: 01880-1249 BUSINESS PHONE: 6172240880 MAIL ADDRESS: STREET 1: 301 EDGEWATER PLACE STREET 2: SUITE 320 CITY: WAKEFIELD STATE: MA ZIP: 01880 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: SUMMIT VENTURES IV LP CENTRAL INDEX KEY: 0000948001 STANDARD INDUSTRIAL CLASSIFICATION: [] FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: C/O SUMMIT PARTNERS STREET 2: 600 ATLANTIC AVE CITY: BOSTON STATE: MA ZIP: 02210 BUSINESS PHONE: 6178241000 MAIL ADDRESS: STREET 1: C/O SUMMIT PARTNERS STREET 2: 600 ATLANTIC AVE CITY: BOSTON STATE: MA ZIP: 02210 SC 13G 1 SCHEDULE 13G 1 OMB APPROVAL OMB Number: 3235-0145 Expires: August 31, 1999 Estimated average burden hours per response... 14.90 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. )* American Dental Partners, Inc. (Name of Issuer) Common Stock, par value $.01 (Title of Class of Securities) 025353103 (CUSIP Number) December 31, 1998 (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 32 Pages 2 CUSIP NO. 025353103 13G PAGE 2 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit Ventures IV, L.P. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) / / - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware limited partnership - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 2 of 32 Pages 3 CUSIP NO. 025353103 13G PAGE 3 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit Partners IV, L.P. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) / / - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware limited partnership - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 3 of 32 Pages 4 CUSIP NO. 025353103 13G PAGE 4 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit Investors II, L.P. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) / / - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware limited partnership - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 4 of 32 Pages 5 CUSIP NO. 025353103 13G PAGE 5 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Stamps, Woodsum & Co. IV - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) / / - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Massachusetts general partnership - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 5 of 32 Pages 6 CUSIP NO. 025353103 13G PAGE 6 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) E. Roe Stamps, IV - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 6 of 32 Pages 7 CUSIP NO. 025353103 13G PAGE 7 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Stephen G. Woodsum - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 7 of 32 Pages 8 CUSIP NO. 025353103 13G PAGE 8 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Gregory M. Avis - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 8 of 32 Pages 9 CUSIP NO. 025353103 13G PAGE 9 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) John A. Genest - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 9 of 32 Pages 10 CUSIP NO. 025353103 13G PAGE 10 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Martin J. Mannion - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 10 of 32 Pages 11 CUSIP NO. 025353103 13G PAGE 11 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Bruce R. Evans - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 11 of 32 Pages 12 CUSIP NO. 025353103 13G PAGE 12 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Thomas S. Roberts - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 12 of 32 Pages 13 CUSIP NO. 025353103 13G PAGE 13 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Walter G. Kortschak - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,376,162 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,376,162 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,376,162 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 31.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 13 of 32 Pages 14 CUSIP NO. 025353103 13G PAGE 14 OF 32 PAGES - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Joseph F. Trustey - -------------------------------------------------------------------------------- 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 0 shares NUMBER OF ------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 2,285,869 shares EACH REPORTING ------------------------------------------------------ PERSON 7 SOLE DISPOSITIVE POWER WITH 0 shares ------------------------------------------------------ 8 SHARED DISPOSITIVE POWER 2,285,869 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,286,869 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / / - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 30.74% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! Page 14 of 32 Pages 15 Schedule 13G Item 1(a). Name of Issuer: American Dental Partners, Inc. Item 1(b). Address of Issuer's Principal Executive Offices: 301 Edgewater Place, Suite 320, Wakefield, MA 01880. Item 2(a). Names of Persons Filing: Summit Ventures IV, L.P., Summit Partners IV, L.P., Summit Investors II, L.P., Stamps, Woodsum & Co. IV and Messrs. E. Roe Stamps, IV, Stephen G. Woodsum, Gregory M. Avis, John A. Genest, Martin J. Mannion, Bruce R. Evans, Thomas S. Roberts, Walter G. Kortschak and Joseph F. Trustey. Summit Partners IV, L.P. is the sole general partner of Summit Ventures IV, L.P. Stamps, Woodsum & Co. IV is the sole general partner of Summit Partners IV, L.P. Messrs. Stamps, Woodsum, Avis, Genest, Mannion, Evans, Roberts, and Kortschak, are individual general partners of Stamps, Woodsum & Co. IV and Summit Investors II, L.P. Mr. Trustey is an individual general partner of Stamps, Woodsum & Co. IV. Item 2(b). Address of Principal Business Office or, if None, Residence: The address of the principal business office of Summit Ventures IV, L.P., Summit Partners IV, L.P., Summit Investors II, L.P., Stamps, Woodsum & Co. IV and Messrs. Stamps, Woodsum, Mannion, Genest, Evans, Roberts and Trustey is Summit Partners, 600 Atlantic Avenue, Boston, Massachusetts 02210. The address of the principal business office of Messrs. Avis and Kortschak is Summit Partners, 499 Hamilton Avenue, Palo Alto, California 94301. Item 2(c). Citizenship: Each of Summit Ventures IV, L.P., Summit Partners IV, L.P. and Summit Investors II, L.P. is a limited partnership organized under the laws of the State of Delaware. Stamps, Woodsum & Co. IV is a general partnership organized under the laws of the Commonwealth of Massachusetts. Each of Messrs. Stamps, Woodsum, Avis, Mannion, Genest, Evans, Roberts, Kortschak and Trustey is a United States citizen. Item 2(d). Title of Class of Securities: Common Stock, par value $.01 Item 2(e). CUSIP Number: 025353103 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a: Page 15 of 32 Pages 16 Not Applicable. Item 4. Ownership. (a) Amount Beneficially Owned: Each of Summit Ventures IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum & Co. IV, and Summit Investors II, L.P. (individually an "Entity" and collectively the "Entities") may be deemed to own beneficially 2,376,162 shares of Common Stock as of December 31, 1998. Each of Messrs. Stamps, Woodsum, Avis, Mannion, Genest, Evans, Roberts, and Kortschak may be deemed to own beneficially 2,376,162 shares of Common Stock as of December 31, 1998. Mr. Trustey may be deemed to own beneficially 2,285,869 shares of Common Stock as of December 31, 1998. As of December 31, 1998, Summit Ventures IV, L.P. was the record holder of 2,285,869 shares of Common Stock. As of December 31, 1998 Summit Investors II, L.P. was the record holder of 90,293 shares of Common Stock. The shares held of record by Summit Ventures IV, L.P. and Summit Investors II, L.P. are referred to herein collectively as the "Record Shares." By virtue of the affiliate relationships among the Entities, each Entity may be deemed to own beneficially all of the Record Shares. Hence, each Entity may be deemed to own beneficially 2,376,162 shares of Common Stock. In their capacities as individual general partners of Stamps, Woodsum & Co. IV and Summit Investors II, L.P. each of Messrs. Stamps, Woodsum, Avis, Mannion, Genest, Evans, Roberts, and Kortschak may be deemed to own beneficially 2,376,162 shares of Common Stock. Mr. Trustey may be deemed to own beneficially 2,285,869 shares of Common Stock. Each of the reporting persons expressly disclaims beneficial ownership of any shares of Common Stock of American Dental Partners, Inc. except in the case of Summit Ventures IV, L.P., for the 2,285,869 shares which it holds of record, and in the case of Summit Investors II, L.P., for the 90,293 shares which it holds of record. (b) Percent of Class: Summit Ventures IV, L.P.: 31.95% Summit Partners IV, L.P.: 31.95% Stamps, Woodsum & Co. IV: 31.95% Summit Investors II, L.P.: 31.95% E. Roe Stamps, IV: 31.95% Stephen G. Woodsum: 31.95% Page 16 of 32 Pages 17 Martin J. Mannion: 31.95% John A. Genest: 31.95% Gregory M. Avis: 31.95% Bruce R. Evans: 31.95% Walter G. Kortschak: 31.95% Thomas S. Roberts: 31.95% Joseph F. Trustey: 30.74% The foregoing percentages are calculated based on the 7,436,066 shares of Common Stock reported to be outstanding in a Form 10-Q for the quarterly period ended September 30, 1998. (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 shares for each reporting person (ii) shared power to vote or to direct the vote: Summit Ventures IV, L.P.: 2,376,162 shares Summit Partners IV, L.P.: 2,376,162 shares Stamps, Woodsum & Co. IV: 2,376,162 shares Summit Investors II, L.P.: 2,376,162 shares E. Roe Stamps, IV: 2,376,162 shares Stephen G. Woodsum: 2,376,162 shares Martin J. Mannion: 2,376,162 shares John A. Genest: 2,376,162 shares Gregory M. Avis: 2,376,162 shares Bruce R. Evans: 2,376,162 shares Walter G. Kortschak: 2,376,162 shares Thomas S. Roberts: 2,376,162 shares Joseph F. Trustey: 2,285,869 shares (iii) sole power to dispose or direct the disposition of: 0 shares for each reporting person (iv) shared power to dispose or direct the disposition of: Summit Ventures IV, L.P.: 2,376,162 shares Summit Partners IV, L.P.: 2,376,162 shares Stamps, Woodsum & Co. IV: 2,376,162 shares Summit Investors II, L.P.: 2,376,162 shares E. Roe Stamps, IV: 2,376,162 shares Page 17 of 32 Pages 18 Stephen G. Woodsum: 2,376,162 shares Martin J. Mannion: 2,376,162 shares John A. Genest: 2,376,162 shares Gregory M. Avis: 2,376,162 shares Bruce R. Evans: 2,376,162 shares Walter G. Kortschak: 2,376,162 shares Thomas S. Roberts: 2,376,162 shares Joseph F. Trustey: 2,285,869 shares 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. The reporting persons expressly disclaim membership in a "group" as defined in Rule 13d-1(b)(ii)(H). Item 9. Notice of Dissolution of Group. Not Applicable. Item 10. Certification. Not Applicable. This statement on Schedule 13G is not filed pursuant to Rule 13d-1(b). Page 18 of 32 Pages 19 SIGNATURES After reasonable inquiry and to the best of our knowledge and belief, we certify that the information set forth in this statement is true, complete and correct. We also hereby agree to file this statement jointly pursuant to the Agreement listed on Exhibit 1 hereto. Dated: February 11, 1999 SUMMIT VENTURES IV, L.P. * ----------------------------- E. Roe Stamps, IV By: Summit Partners IV, L.P. By: Stamps, Woodsum & Co. IV * ----------------------------- Stephen G. Woodsum By: * --------------------------------- E. Roe Stamps, IV * General Partner ----------------------------- Gregory M. Avis SUMMIT INVESTORS II, L.P. * ----------------------------- Martin J. Mannion By: /s/ John A. Genest ------------------------------- General Partner /s/ John A. Genest ----------------------------- John A. Genest SUMMIT PARTNERS IV, L.P. * ----------------------------- Bruce R. Evans By: Stamps, Woodsum & Co. IV * ----------------------------- Walter G. Kortschak By: * --------------------------------- E. Roe Stamps General Partner * ----------------------------- Thomas S. Roberts STAMPS, WOODSUM & CO. IV * ----------------------------- Joseph F. Trustey By: * ------------------------------ E. Roe Stamps General Partner Page 19 of 32 Pages 20 *By: /s/ John A. Genest --------------------------- John A. Genest, Attorney-in-Fact - -------------------------------------------------------------------------------- * Pursuant to Powers of Attorney on file with the Commission, which Powers of Attorney are incorporated herein by reference. Copies of such Powers of Attorney are attached hereto as Exhibit 2. Page 20 of 32 Pages EX-99.1 2 AGREEMENT 1 Exhibit 1 AGREEMENT Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of shares of Common Stock of American Dental Partners, Inc. This agreement may be executed in any number of counterparts, each of which shall be deemed an original. EXECUTED this 10th day of February, 1999. SUMMIT VENTURES IV, L.P. * ------------------------------- E. Roe Stamps, IV By: Summit Partners IV, L.P. By: Stamps, Woodsum & Co. IV * ------------------------------- Stephen G. Woodsum By: * -------------------------- E. Roe Stamps, IV * General Partner ------------------------------- Gregory M. Avis SUMMIT INVESTORS II, L.P. * ------------------------------- Martin J. Mannion By: /s/ John A. Genest ------------------------------ General Partner /s/ John A. Genest ------------------------------- SUMMIT PARTNERS IV, L.P. John A. Genest By: Stamps, Woodsum & Co. IV * ------------------------------- Bruce R. Evans By: * ------------------------- E. Roe Stamps, IV General Partner * ------------------------------- Walter G. Kortschak STAMPS, WOODSUM & CO. IV By: * ------------------------ E. Roe Stamps, IV General Partner Page 21 of 32 Pages 2 * ------------------------------- Thomas S. Roberts * ------------------------------- Joseph F. Trustey *By: /s/ John A. Genest ------------------------------- John A. Genest, Attorney-in-Fact - -------------------------------------------------------------------------------- * Pursuant to Powers of Attorney on file with the Commission, which Powers of Attorney are incorporated herein by reference. Copies of such Powers of Attorney are attached hereto as Exhibit 2. Page 22 of 32 Pages EX-99.2 3 POWER OF ATTORNEY 1 Exhibit 2 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints each and any of E. Roe Stamps, IV, Stephen G. Woodsum and John A. Genest his true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities (until revoked in writing) to sign any and all instruments, certificates and documents required to be executed on behalf of himself individually or on behalf of each or any of Summit Ventures, L.P., Summit Partners, L.P., Stamps, Woodsum & Co., Summit Partners' Holdings, L.P., Summit Ventures II, L.P., Summit Partners II, L.P., Stamps, Woodsum & Co. II, SV Eurofund C.V., SV International, L.P., Stamps, Woodsum International & Co., Summit Investors, L.P., Summit Investors II, L.P., Summit Investors II, L.P., Summit Ventures III, L.P., Summit Partners III, L.P., Stamps, Woodsum & Co. III, Summit Ventures IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum & Co., IV, Summit Subordinated Debt Fund, L.P., Summit Partners SD, L.P., SW Management Corp., Summit Management Co., Summit Subordinated Debt Fund II, L.P., and Summit Partners SD II, LLC, pursuant to sections 13 and 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and any and all regulations promulgated thereunder, and to file the same, with all exhibits thereto, and any other documents in connection therewith, with the Securities and Exchange Commission, and with any other entity when and if such is mandated by the Exchange Act or by the By-laws of the National Association of Securities Dealers, granting unto said attorney-in-fact and agent full power and authority to do and perform each and every act and thing requisite and necessary fully to all intents and purposes as she might or could do in person thereby ratifying and confirming all that said attorney-in-fact and agent, or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof. Page 23 of 32 Pages 2 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ E. Roe Stamps, IV ---------------------------------------- E. Roe Stamps, IV Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 10th day of February, 1997, before me personally came E. Roe Stamps, IV, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Cynthia R. Freidman ---------------------------------------- Notary Public My Commission expires: October 20, 2000 Page 24 of 32 Pages 3 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ Stephen G. Woodsum ---------------------------------------- Stephen G. Woodsum Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 10th day of February, 1997, before me personally came Stephen G. Woodsum, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Cynthia R. Freidman ---------------------------------------- Notary Public My Commission expires: October 20, 2000 Page 25 of 32 Pages 4 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ Martin J. Mannion ---------------------------------------- Martin J. Mannion Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 10th day of February, 1997, before me personally came Martin J. Mannion, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Cynthia R. Freidman ---------------------------------------- Notary Public My Commission expires: October 20, 2000 Page 26 of 32 Pages 5 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ John A. Genest ---------------------------------------- John A. Genest Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 10th day of February, 1997, before me personally came John A. Genest, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Cynthia R. Freidman ---------------------------------------- Notary Public My Commission expires: October 20, 2000 Page 27 of 32 Pages 6 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ Gregory M. Avis ---------------------------------------- Gregory M. Avis State of California ) ) ss: County of Santa Clara ) On this 3rd day of February, 1997, before me personally came Stephen G. Woodsum, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Katherine C. Ely ---------------------------------------- Notary Public My Commission expires: May 28, 2000 Page 28 of 32 Pages 7 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ Thomas S. Roberts ---------------------------------------- Thomas S. Roberts Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 10th day of February, 1997, before me personally came Thomas S. Roberts, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Cynthia R. Freidman ---------------------------------------- Notary Public My Commission expires: October 20, 2000 Page 29 of 32 Pages 8 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ Bruce R. Evans ---------------------------------------- Bruce R. Evans Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 10th day of February, 1997, before me personally came Bruce R. Evans, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Cynthia R. Freidman ---------------------------------------- Notary Public My Commission expires: October 20, 2000 Page 30 of 32 Pages 9 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ Walter G. Kortschak ---------------------------------------- Walter G. Kortschak State of California ) ) ss: County of Santa Clara ) On this 3rd day of February, 1997, before me personally came Walter G. Kortschak, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Katherine C. Ely ---------------------------------------- Notary Public My Commission expires: May 28, 2000 Page 31 of 32 Pages 10 IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 10th day of February, 1997. /s/ Joseph F. Trustey ---------------------------------------- Joseph F. Trustey Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 10th day of February, 1997, before me personally came Joseph F. Trustey, known to me to be the person described and who executed the foregoing instrument that he acknowledged that he executed the same. [Notary Seal] /s/ Cynthia R. Freidman ---------------------------------------- Notary Public My Commission expires: October 20, 2000 Page 32 of 32 Pages -----END PRIVACY-ENHANCED MESSAGE-----