-----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, U6+dpKYaLq+gZu/C03OU89OPDyJ/BenKpXVti+hd4UXmM+4sq6f7oO5beTIty1ei RgUVwu097y3sL37uEzvAwA== 0001072613-02-000184.txt : 20020414 0001072613-02-000184.hdr.sgml : 20020414 ACCESSION NUMBER: 0001072613-02-000184 CONFORMED SUBMISSION TYPE: SC 13G/A PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20020211 GROUP MEMBERS: BRUCE R. EVANS GROUP MEMBERS: E. ROE STAMPS, IV GROUP MEMBERS: GREGORY M. AVIS GROUP MEMBERS: JOSEPH F. TRUSTEY GROUP MEMBERS: KEVIN P. MOHAN GROUP MEMBERS: MARTIN J. MANNION GROUP MEMBERS: PETER Y. CHUNG GROUP MEMBERS: STAMPS, WOODSUM &CO. IV GROUP MEMBERS: STEPHEN G. WOODSUM GROUP MEMBERS: SUMMIT INVESTORS III, L.P. GROUP MEMBERS: SUMMIT PARTNERS IV, L.P. GROUP MEMBERS: SUMMIT PARTNERS V, L.P. GROUP MEMBERS: SUMMIT PARTNERS, LLC GROUP MEMBERS: SUMMIT V ADVISORS FUND (QP), L.P. GROUP MEMBERS: SUMMIT V ADVISORS FUND, L.P. GROUP MEMBERS: SUMMIT V COMPANION FUND, L.P. GROUP MEMBERS: SUMMIT VENTURES V, L.P. GROUP MEMBERS: THOMAS F. FARB GROUP MEMBERS: THOMAS S. ROBERTS GROUP MEMBERS: WALTER G. KORTSCHAK SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: IBASIS INC CENTRAL INDEX KEY: 0001091756 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-BUSINESS SERVICES, NEC [7389] IRS NUMBER: 043332534 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A SEC ACT: 1934 Act SEC FILE NUMBER: 005-57187 FILM NUMBER: 02532817 BUSINESS ADDRESS: STREET 1: 20 SECOND AVE CITY: BURLINGTON STATE: MA ZIP: 01803 BUSINESS PHONE: 7815057500 MAIL ADDRESS: STREET 1: 20 SECOND AVE CITY: BURLINGTON STATE: MA ZIP: 01803 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: SUMMIT VENTURES IV LP CENTRAL INDEX KEY: 0000948001 FILING VALUES: FORM TYPE: SC 13G/A 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/A 1 sc13g_11043.txt SCHEDULE 13G/A - IBASIS, INC. UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 1)* iBASIS, Inc. - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 450732-10-2 - -------------------------------------------------------------------------------- (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) [X] Rule 13d-1(c) [ ] 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 44 Pages - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 2 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 2 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 3 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit Ventures V, 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 3 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 4 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit Investors III, 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 4 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 5 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit V Companion Fund, 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 5 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 6 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit V Advisors Fund, 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 6 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 7 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit V Advisors Fund (QP), 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 7 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 8 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit Partners V, 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 8 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 9 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Summit Partners, LLC - -------------------------------------------------------------------------------- 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 liability company - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 0 shares NUMBER OF ----------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED BY 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * CO ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 9 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 10 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 10 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 11 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * PN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 11 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 12 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 12 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 13 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 13 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 14 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 14 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 15 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 15 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 16 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 16 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 17 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 17 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 18 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 18 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 19 OF 44 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 19 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 20 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Kevin P. Mohan - -------------------------------------------------------------------------------- 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 20 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 21 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Peter Y. Chung - -------------------------------------------------------------------------------- 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 803,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 803,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 803,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.78% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 21 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 22 OF 44 PAGES - ---------------------- ------------------- ================================================================================ 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Thomas F. Farb - -------------------------------------------------------------------------------- 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 430,462 shares EACH ----------------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON WITH 0 shares ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 430,462 shares - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 430,462 shares - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.95% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON * IN ================================================================================ *SEE INSTRUCTIONS BEFORE FILLING OUT! PAGE 22 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 23 OF 44 PAGES - ---------------------- ------------------- ITEM 1. (a) NAME OF ISSUER: iBasis, Inc. (b) Address of Issuer's Principal Executive Offices: 20 Second Avenue, Burlington, MA 01803 ITEM 2. (a) Name of Persons Filing: Summit Ventures V, L.P., Summit Partners V, L.P., Summit Partners, LLC, Summit V Companion Fund, L.P., Summit V Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P., Summit Ventures IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum & Co. IV, Summit Investors III, L.P. and Messrs. E. Roe Stamps, IV, Stephen G. Woodsum, Gregory M. Avis, Martin J. Mannion, Bruce R. Evans, Thomas S. Roberts, Walter G. Kortschak, Joseph F. Trustey, Kevin P. Mohan, Peter Y. Chung and Thomas F. Farb. Summit Partners V, L.P. is the sole general partner of each of Summit Ventures V, L.P., Summit V Companion Fund, L.P., Summit V Advisors Fund, L.P. and Summit V Advisors Fund (QP), L.P. Summit Partners, LLC is the sole general partner of Summit Partners V, L.P. 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, Mannion, Evans, Roberts, Kortschak, Trustey, Mohan, Chung are individual general partners of each of Summit Partners, LLC, Summit Investors III, L.P. and Stamps, Woodsum & Co. IV. Mr. Farb is an individual general partner of each of Summit Partners, LLC and Summit Investors III, L.P. (b) Address of Principal Business Office or, if none, Residence: The address of the principal business office of Summit Ventures V, L.P., Summit Partners V, L.P., Summit Partners, LLC, Summit V Companion Fund, L.P., Summit V Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P., Summit Ventures IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum & Co. IV, Summit Investors III, L.P. and Messrs. Stamps, Woodsum, Mannion, Evans, Roberts, Trustey, Mohan and Farb is Summit Partners, 600 Atlantic Avenue, Boston, Massachusetts 02210. The address of the principal business office of Messrs. Avis, Kortschak and Chung is Summit Partners, 499 Hamilton Avenue, Palo Alto, California 94301. (c) Citizenship: Each of Summit Ventures V, L.P., Summit Partners V, L.P., Summit V Companion Fund, L.P., Summit V Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P., Summit Ventures IV, L.P., Summit Partners IV, L.P. and Summit Investors III, L.P. is a limited partnership organized under the laws of the State of Delaware. Summit Partners, LLC is a limited liability company 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, Evans, Roberts, Kortschak, Trustey, Mohan, Chung and Farb is a United States citizen. PAGE 23 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 24 OF 44 PAGES - ---------------------- ------------------- (d) Title of Class of Securities: Common Stock, $.001 par value per share (e) CUSIP Number: 450732-10-2 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. ITEM 4. OWNERSHIP (a) Amount beneficially owned: Each of Summit Ventures V, L.P., Summit Partners V, L.P., Summit Partners, LLC, Summit V Companion Fund, L.P., Summit V Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P., Summit Ventures IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum & Co. IV, Summit Investors III, L.P. (individually an "Entity" and collectively the "Entities") may be deemed to own beneficially 803,462 shares of Common Stock as of December 31, 2001. Each of Messrs. Stamps, Woodsum, Avis, Mannion, Evans, Roberts, Kortschak, Trustey, Mohan and Chung may be deemed to own beneficially 803,462 shares of Common Stock as of December 31, 2001. Mr. Farb may be deemed to own beneficially 430,462 shares of Common Stock as of December 31, 2001. As of December 31, 2001, Summit Ventures V, L.P. was the record owner of 319,564 shares of Common Stock. As of December 31, 2001, Summit V Companion Fund, L.P. was the record owner of 53,435 shares of Common Stock. As of December 31, 2001, Summit V Advisors Fund, L.P. was the record owner of 6,532 shares of Common Stock. As of December 31, 2001, Summit V Advisors Fund (QP), L.P. was the record owner of 21,373 shares of Common Stock. As of December 31, 2001, Summit Ventures IV, L.P. was the record owner of 373,000 shares of Common Stock. As of December 31, 2001, Summit Investors III, L.P. was the record owner of 29,558 shares of Common Stock. The shares held of record by Summit Ventures V, L.P., Summit V Companion Fund, L.P., Summit V Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P., Summit Ventures IV, L.P. and Summit Investors III, 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 803,462 shares. In their capacities as individual general partners of Summit Partners, LLC, Summit Investors III, L.P. and Stamps, Woodsum & Co. IV, each of Messrs. Stamps, Woodsum, Avis, Mannion, Evans, Roberts, Kortschak, Trustey, Mohan, Chung may be deemed to own beneficially 803,462 shares. In his capacity as individual general partner of Summit Partners, LLC and Summit Investors III, L.P., Mr. Farb may be deemed to own beneficially 430,462 shares. PAGE 24 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 25 OF 44 PAGES - ---------------------- ------------------- Each of the reporting persons expressly disclaims beneficial ownership of any shares of Common Stock of iBasis, Inc., except in the case of Summit Ventures V, L.P. for the 319,564 shares which it holds of record, Summit V Companion Fund, L.P. for the 53,435 shares which it holds of record, Summit V Advisors Fund, L.P. for the 6,532 shares which it holds of record, Summit V Advisors Fund (QP), L.P. for the 21,373 shares which it holds of record, Summit Ventures IV, L.P. for the 373,000 shares which it holds of record and Summit Investors III, L.P. for the 29,558 shares which it holds of record. (b) Percent of class: Summit Ventures V, L.P.: 1.78% Summit Partners V, L.P.: 1.78% Summit Partners, LLC: 1.78% Summit V Companion Fund, L.P.: 1.78% Summit V Advisors Fund, L.P.: 1.78% Summit V Advisors Fund (QP), L.P.: 1.78% Summit Investors III, L.P.: 1.78% Summit Ventures IV, L.P.: 1.78% Summit Partners IV, L.P.: 1.78% Stamps, Woodsum & Co. IV: 1.78% E. Roe Stamps, IV: 1.78% Stephen G. Woodsum: 1.78% Gregory M. Avis: 1.78% Martin J. Mannion: 1.78% Bruce R. Evans: 1.78% Walter G. Kortschak: 1.78% Thomas S. Roberts: 1.78% Joseph F. Trustey: 1.78% Kevin P. Mohan: 1.78% Peter Y. Chung: 1.78% Thomas F. Farb: 0.95% The foregoing percentages were calculated based on the 45,265,034 shares of Common Stock reported to be outstanding in a Quarterly Report on form 10-Q for iBasis, Inc. filed on November 14, 2001 for the quarterly period ended September 30, 2001. (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 0 shares for each person. PAGE 25 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 26 OF 44 PAGES - ---------------------- ------------------- (ii) Shared power to vote or to direct the vote: Summit Ventures V, L.P.: 803,462 Summit Partners V, L.P.: 803,462 Summit Partners, LLC: 803,462 Summit V Companion Fund, L.P.: 803,462 Summit V Advisors Fund, L.P.: 803,462 Summit V Advisors Fund (QP), L.P.: 803,462 Summit Investors III, L.P.: 803,462 Summit Ventures IV, L.P.: 803,462 Summit Partners IV, L.P.: 803,462 Stamps, Woodsum & Co. IV: 803,462 E. Roe Stamps, IV: 803,462 Stephen G. Woodsum: 803,462 Gregory M. Avis: 803,462 Martin J. Mannion: 803,462 Bruce R. Evans: 803,462 Walter G. Kortschak: 803,462 Thomas S. Roberts: 803,462 Joseph F. Trustey: 803,462 Kevin P. Mohan: 803,462 Peter Y. Chung: 803,462 Thomas F. Farb: 430,462 (iii) Sole power to dispose or to direct the disposition of: 0 shares for each reporting person (iv) Shared power to dispose or to direct the disposition of: Summit Ventures V, L.P.: 803,462 Summit Partners V, L.P.: 803,462 Summit Partners, LLC: 803,462 Summit V Companion Fund, L.P.: 803,462 Summit V Advisors Fund, L.P.: 803,462 Summit V Advisors Fund (QP), L.P.: 803,462 Summit Investors III, L.P.: 803,462 Summit Ventures IV, L.P.: 803,462 Summit Partners IV, L.P.: 803,462 Stamps, Woodsum & Co. IV: 803,462 E. Roe Stamps, IV: 803,462 Stephen G. Woodsum: 803,462 PAGE 26 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 27 OF 44 PAGES - ---------------------- ------------------- Gregory M. Avis: 803,462 Martin J. Mannion: 803,462 Bruce R. Evans: 803,462 Walter G. Kortschak: 803,462 Thomas S. Roberts: 803,462 Joseph F. Trustey: 803,462 Kevin P. Mohan: 803,462 Peter Y. Chung: 803,462 Thomas F. Farb: 430,462 ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS This statement is being filed to report that as of the date hereof each reporting person has ceased to be the beneficial owner of more than five percent of the outstanding Common Stock of iBasis, Inc. ALL OTHER ITEMS REPORTED ON THE SCHEDULE 13G FILED ON MARCH 14, 2001 ON BEHALF OF THE REPORTING PERSONS WITH RESPECT TO THE COMMON STOCK OF IBASIS, INC. REMAIN UNCHANGED. PAGE 27 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 28 OF 44 PAGES - ---------------------- ------------------- 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 7, 2002 SUMMIT VENTURES V, L.P. SUMMIT V COMPANION FUND, L.P. By: Summit Partners V, L.P. By: Summit Partners V, L.P. By: Summit Partners, LLC By: Summit Partners, LLC By: * By: * --------------------------------- --------------------------------- General Partner General Partner SUMMIT V ADVISORS FUND (QP), L.P. SUMMIT V ADVISORS FUND, L.P. By: Summit Partners V, L.P. By: Summit Partners V, L.P. By: Summit Partners, LLC By: Summit Partners, LLC By: * By: * --------------------------------- --------------------------------- General Partner General Partner SUMMIT PARTNERS V, L.P. SUMMIT INVESTORS III, L.P. By: Summit Partners, LLC By: * --------------------------------- General Partner By: * --------------------------------- General Partner SUMMIT VENTURES IV, L.P. SUMMIT PARTNERS, LLC By: Summit Partners IV, L.P. By: Stamps, Woodsum & Co. IV By: * By: * --------------------------------- --------------------------------- General Partner E. Roe Stamps, IV General Partner PAGE 28 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 29 OF 44 PAGES - ---------------------- ------------------- SUMMIT PARTNERS IV, L.P. STAMPS, WOODSUM & CO. IV By: Stamps, Woodsum & Co. IV By: * --------------------------------- E. Roe Stamps, IV General Partner By: * --------------------------------- E. Roe Stamps, IV General Partner * * - ------------------------------------ ------------------------------------ E. Roe Stamps, IV Stephen G. Woodsum * * - ------------------------------------ ------------------------------------ Martin J. Mannion Gregory M. Avis * * - ------------------------------------ ------------------------------------ Bruce R. Evans Walter G. Kortschak * * - ------------------------------------ ------------------------------------ Thomas S. Roberts Joseph F. Trustey * * - ------------------------------------ ------------------------------------ Kevin P. Mohan Peter Y. Chung *By: /s/ Thomas F. Farb -------------------------------- Thomas F. Farb Individually and as 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 29 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 30 OF 44 PAGES - ---------------------- ------------------- Exhibit 1 --------- AGREEMENT Pursuant to Rule 13d-1(k)(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 iBasis, Inc. This agreement may be executed in any number of counterparts, each of which shall be deemed an original. EXECUTED this 7th day of February, 2002 SUMMIT VENTURES V, L.P. SUMMIT V COMPANION FUND, L.P. By: Summit Partners V, L.P. By: Summit Partners V, L.P. By: Summit Partners, LLC By: Summit Partners, LLC By: * By: * --------------------------------- --------------------------------- General Partner General Partner SUMMIT V ADVISORS FUND (QP), L.P. SUMMIT V ADVISORS FUND, L.P. By: Summit Partners V, L.P. By: Summit Partners V, L.P. By: Summit Partners, LLC By: Summit Partners, LLC By: * By: * --------------------------------- --------------------------------- General Partner General Partner SUMMIT PARTNERS V, L.P. SUMMIT INVESTORS III, L.P. By: Summit Partners, LLC By: * --------------------------------- General Partner By: * --------------------------------- General Partner PAGE 30 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 31 OF 44 PAGES - ---------------------- ------------------- SUMMIT PARTNERS, LLC SUMMIT VENTURES IV, L.P. By: Summit Partners IV, L.P. By: * --------------------------------- General Partner By: Stamps, Woodsum & Co. IV By: * --------------------------------- SUMMIT PARTNERS IV, L.P. STAMPS, WOODSUM & CO. IV By: Stamps, Woodsum & Co. IV By: * --------------------------------- E. Roe Stamps, IV General Partner By: * --------------------------------- E. Roe Stamps, IV General Partner * * - ------------------------------------ ------------------------------------ E. Roe Stamps, IV Stephen G. Woodsum * * - ------------------------------------ ------------------------------------ Martin J. Mannion Gregory M. Avis * * - ------------------------------------ ------------------------------------ Bruce R. Evans Walter G. Kortschak * * - ------------------------------------ ------------------------------------ Thomas S. Roberts Joseph F. Trustey * * - ------------------------------------ ------------------------------------ Kevin P. Mohan Peter Y. Chung PAGE 31 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 32 OF 44 PAGES - ---------------------- ------------------- *By: /s/ Thomas F. Farb ------------------------------- Thomas F. Farb Individually and as 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 32 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 33 OF 44 PAGES - ---------------------- ------------------- 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, Gregory M. Avis, Walter G. Kortschak and Thomas F. Farb 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., SP (1984), L.P. (f/k/a 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., Summit Investors, L.P., Summit Investors II, L.P., Summit Investors III, 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., Summit E-Tek Holdings, LLC, SW Management Corp., Summit Partners, L.P., Summit Master Company, LLC, Summit Subordinated Debt Fund II, L.P., Summit Partners SD II, LLC, Summit Ventures V, L.P., Summit Partners V, L.P., Summit Partners, LLC, Summit V Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P. and Summit V Companion Fund, L.P., 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 33 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 34 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ E. Roe Stamps, IV --------------------------- E. Roe Stamps, IV Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 34 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 35 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ Stephen G. Woodsum --------------------------- Stephen G. Woodsum Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 35 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 36 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ Martin J. Mannion --------------------------- Martin J. Mannion Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 36 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 37 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 8th day of February, 2000. /s/ Gregory M. Avis --------------------------- Gregory M. Avis State of California ) ) ss: County of Santa Clara ) On this 8th day of February, 2000, before me personally came Gregory M. Avis, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 37 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 38 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ Thomas S. Roberts --------------------------- Thomas S. Roberts Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 38 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 39 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ Bruce R. Evans --------------------------- Bruce R. Evans Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 39 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 40 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 8th day of February, 2000. /s/ Walter G. Kortschak --------------------------- Walter G. Kortschak State of California ) ) ss: County of Santa Clara ) On this 8th day of February, 2000, 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/ Cynthia R. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 40 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 41 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ Joseph F. Trustey --------------------------- Joseph F. Trustey Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 41 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 42 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ Kevin P. Mohan --------------------------- Kevin P. Mohan Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, before me personally came Kevin P. Mohan, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 42 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 43 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 8th day of February, 2000. /s/ Peter Y. Chung --------------------------- Peter Y. Chung Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 8th day of February, 2000, before me personally came Peter Y. Chung, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 43 OF 44 PAGES - ---------------------- ------------------- CUSIP NO. 450732-10-2 13G PAGE 44 OF 44 PAGES - ---------------------- ------------------- IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th day of February, 2000. /s/ Thomas F. Farb --------------------------- Thomas F. Farb Commonwealth of Massachusetts ) ) ss: County of Suffolk ) On this 7th day of February, 2000, before me personally came Thomas S. Farb, 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. Freedman --------------------------- Notary Public My Commission Expires: October 20, 2000 PAGE 44 OF 44 PAGES -----END PRIVACY-ENHANCED MESSAGE-----