-----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, LGHS+Lkhd1PRmhXPJ0g4VXPwctGK9bruaN8R4wfyrkZOPk8Tg5UmTntHhJqmOk3c CNeESQWvwEgqzo+6rhmDGQ== 0000950005-06-000048.txt : 20060207 0000950005-06-000048.hdr.sgml : 20060207 20060206175447 ACCESSION NUMBER: 0000950005-06-000048 CONFORMED SUBMISSION TYPE: SC 13G/A PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20060207 DATE AS OF CHANGE: 20060206 GROUP MEMBERS: EDGARSERVICE@PFP.NET SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: ARBINET THEXCHANGE INC CENTRAL INDEX KEY: 0001136655 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-BUSINESS SERVICES, NEC [7389] IRS NUMBER: 133930916 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A SEC ACT: 1934 Act SEC FILE NUMBER: 005-80439 FILM NUMBER: 06583093 BUSINESS ADDRESS: STREET 1: 120 ALBANY STREET, TOWER II STREET 2: SUITE 450 CITY: NEW BRUNSWICK STATE: NJ ZIP: 08901 BUSINESS PHONE: 7325099100 MAIL ADDRESS: STREET 1: 120 ALBANY STREET, TOWER II STREET 2: SUITE 450 CITY: NEW BRUNSWICK STATE: NJ ZIP: 08901 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: COMMUNICATIONS VENTURES III L P CENTRAL INDEX KEY: 0001073071 IRS NUMBER: 770495136 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A BUSINESS ADDRESS: STREET 1: 305 LYTTON AVE CITY: PALO ALTO STATE: CA ZIP: 94301 BUSINESS PHONE: 6503259600 MAIL ADDRESS: STREET 1: 305 LYTTON AVE CITY: PALO ALTO STATE: CA ZIP: 94301 SC 13G/A 1 p19651_13ga.txt SCHEDULE 13G/ AMENDMENT #1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1 (b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 (b) (Amendment No. 1)* Arbinet-thexchange, Inc. - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 03875P100 - -------------------------------------------------------------------------------- (CUSIP Number) December 31, 2005 - -------------------------------------------------------------------------------- (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 disclosures provided in a prior cover page. The information required on 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). (Continued on following pages) Page 1 of 17 Pages Exhibit Index Contained on Page 17 Page 2 of 17 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Communications Ventures III, L.P. ("CV III") Tax ID Number: - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER 7,026 shares, except that ComVen III, L.L.C. ("ComVen III"), the general partner of CV NUMBER OF III, may be deemed to have sole power to vote SHARES these shares, and Roland A. Van der Meer BENEFICIALLY ("Van der Meer") and Michael P. Rolnick OWNED BY EACH ("Rolnick"), the members of ComVen III, may REPORTING be deemed to have shared power to vote these PERSON shares. WITH -------- --------------------------------------------- 6 SHARED VOTING POWER See response to row 5. -------- --------------------------------------------- 7 SOLE DISPOSITIVE POWER 7,026 shares, except that ComVen III, the general partner of CV III, may be deemed to have sole power to dispose of these shares, and Van der Meer and Rolnick, the members of ComVen III, may be deemed to have shared power to dispose of these shares. -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER See response to row 7. - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,026 - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON PN - ------------ ------------------------------------------------------------------- Page 3 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Communications Ventures III CEO & Entrepreneurs' Fund, L.P. ("CE III") Tax ID Number: - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER 350 shares, except that ComVen III, the general partner of CE III, may be deemed to NUMBER OF have sole power to vote these shares, and Van SHARES der Meer and Rolnick, the members of ComVen BENEFICIALLY III, may be deemed to have shared power to OWNED BY EACH vote these shares. REPORTING -------- --------------------------------------------- PERSON 6 SHARED VOTING POWER WITH See response to row 5. -------- --------------------------------------------- 7 SOLE DISPOSITIVE POWER 350 shares, except that ComVen III, the general partner of CE III, may be deemed to have sole power to dispose of these shares, and Van der Meer and Rolnick, the members of ComVen III, may be deemed to have shared power to dispose of these shares. -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER See response to row 7. - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 350 - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON PN - ------------ ------------------------------------------------------------------- Page 4 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON ComVen III, L.L.C. ("ComVen III") Tax ID Number: - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER 7,376 shares, of which 7,026 are directly owned by CV III and 350 are directly owned by CE III. ComVen III, the general partner of NUMBER OF both CV III and CE III, may be deemed to have SHARES sole power to vote these shares, and Van der BENEFICIALLY Meer and Rolnick, the members of ComVen III, OWNED BY EACH may be deemed to have shared power to vote REPORTING these shares. PERSON -------- --------------------------------------------- WITH 6 SHARED VOTING POWER See response to row 5. -------- --------------------------------------------- 7 SOLE DISPOSITIVE POWER 7,376 shares, of which 7,026 are directly owned by CV III and 350 are directly owned by CE III. ComVen III, the general partner of both CV III and CE III, may be deemed to have sole power to dispose of these shares, and Van der Meer and Rolnick, the members of ComVen III, may be deemed to have shared power to dispose of these shares. -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER See response to row 7. - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,376 - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON OO - ------------ ------------------------------------------------------------------- Page 5 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON ComVentures IV, L.P. ("CV IV") Tax ID Number: - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER - 0 - NUMBER OF -------- --------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY - 0 - OWNED BY EACH -------- --------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON - 0 - WITH -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER - 0 - - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 0 - - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON PN - ------------ ------------------------------------------------------------------- Page 6 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON ComVentures IV CEO Fund, L.P. ("CF IV") Tax ID Number: - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER - 0 - NUMBER OF -------- --------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY - 0 - OWNED BY EACH -------- --------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON - 0 - WITH -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER - 0 - - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 0 - - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON PN - ------------ ------------------------------------------------------------------- Page 7 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Comventures IV Entrepreneurs' Fund, L.P. ("EF IV") Tax ID Number: - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER - 0 - NUMBER OF -------- --------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY - 0 - OWNED BY EACH -------- --------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON - 0 - WITH -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER - 0 - - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 0 - - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON PN - ------------ ------------------------------------------------------------------- Page 8 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON ComVen IV, L.L.C. ("ComVen IV") Tax ID Number: - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER - 0 - NUMBER OF -------- --------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY - 0 - OWNED BY EACH -------- --------------------------------------------- REPORTING 7 SOLE DISPOSITIVE POWER PERSON - 0 - WITH -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER - 0 - - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 0 - - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ----------- -------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON OO - ------------ ------------------------------------------------------------------- Page 9 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Roland A. Van der Meer ("Van der Meer") - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Citizen of the Netherlands - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER 0 shares. -------- --------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 7,376 shares, of which 7,026 are directly BENEFICIALLY owned by CV III and 350 are directly owned by OWNED BY EACH CE III. Van der Meer is a member of ComVen REPORTING III, the general partner of CV III and CE PERSON III, and may be deemed to have shared power WITH to vote these shares. -------- --------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER 7,376 shares, of which 7,026 are directly owned by CV III and 350 are directly owned by CE III. Van der Meer is a member of ComVen III, the general partner of CV III and CE III, and may be deemed to have shared power to dispose of these shares. - ------------ ------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,376 - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON IN - ------------ ------------------------------------------------------------------- Page 10 of 17 Pages - ------------ ------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Michael P. Rolnick ("Rolnick") - ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) [X] - ------------ ------------------------------------------------------------------- 3 SEC USE ONLY - ------------ ------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ------------ ------------------------------------------------------------------- 5 SOLE VOTING POWER 0 shares. -------- --------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES 7,376 shares, of which 7,026 are directly BENEFICIALLY owned by CV III and 350 are directly owned by OWNED BY EACH CE III. Rolnick is a member of ComVen III, REPORTING the general partner of CV III and CE III, and PERSON may be deemed to have shared power to vote WITH these shares. -------- --------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- --------------------------------------------- 8 SHARED DISPOSITIVE POWER 7,376 shares, of which 7,026 are directly owned by CV III and 350 are directly owned by CE III. Rolnick is a member of ComVen III, the general partner of CV III and CE III, and may be deemed to have shared power to dispose of these shares. - ------------------------------------ -------- ---------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,376 - ------------ ------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------ ------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0% - ------------ ------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON IN - ------------ ------------------------------------------------------------------- Page 11 of 17 Pages This statement amends the Statement on Schedule 13G previously filed by Communications Ventures III, L.P. ("CV III"), Communications Ventures III CEO & Entrepreneurs' Fund, L.P. ("CE III"), ComVen III, L.L.C. ("ComVen III"), ComVentures IV, L.P. ("CV IV"), ComVentures IV CEO Fund, L.P. ("CF IV") Comventures IV Entrepreneurs' Fund, L.P. ("EF IV"), ComVen IV, L.L.C. ("ComVen IV"), Michael P. Rolnick ("Rolnick") and Roland A. Van der Meer ("Van der Meer"). The foregoing entities and individuals are collectively referred to as the "Reporting Persons." Only those items as to which there have been changes are included in this Amendment No. 1. ITEM 2(A). NAME OF PERSONS FILING ---------------------- This statement is filed by Communications Ventures III, L.P. ("CV III"), Communications Ventures III CEO & Entrepreneurs' Fund, L.P. ("CE III"), ComVen III, L.L.C. ("ComVen III"), ComVentures IV, L.P. ("CV IV"), ComVentures IV CEO Fund, L.P. ("CF IV") Comventures IV Entrepreneurs' Fund, L.P. ("EF IV"), ComVen IV, L.L.C. ("ComVen IV"), Michael P. Rolnick ("Rolnick") and Roland A. Van der Meer ("Van der Meer"). The foregoing entities and individuals are collectively referred to as the "Reporting Persons." ComVen III, the general partner of CV III and CE III, may be deemed to have sole power to vote and sole power to dispose of shares of the issuer directly owned by CV III and CE III. ComVen IV, the general partner of CV IV, CF IV and EF IV, may be deemed to have sole power to vote and sole power to dispose of shares of the issuer directly owned by CV IV, CF IV and EF IV. Rolnick and Van der Meer are members of ComVen III and ComVen IV and may be deemed to have shared power to vote and shared power to dispose of shares of the issuer directly owned by CV III, CE III, CV IV, CF IV and EF IV. ITEM 2(C) CITIZENSHIP ----------- CV III, CE III, CV IV, CF IV and EF IV are Delaware limited partnerships. ComVen III and ComVen IV are Delaware limited liability companies. Rolnick is a United States citizen. Van der Meer is a citizen of the Netherlands. Page 12 of 17 Pages ITEM 4. OWNERSHIP --------- Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. (a) Amount beneficially owned: -------------------------- See Row 9 of cover page for each Reporting Person. (b) Percent of Class: ----------------- See Row 11 of cover page for each Reporting Person. (c) Number of shares as to which such person has: --------------------------------------------- (i) Sole power to vote or to direct the vote: ----------------------------------------- See Row 5 of cover page for each Reporting Person. (ii) Shared power to vote or to direct the vote: ------------------------------------------- See Row 6 of cover page for each Reporting Person. (iii) Sole power to dispose or to direct the disposition of: ---------------------------------------- See Row 7 of cover page for each Reporting Person. (iv) Shared power to dispose or to direct the disposition of: -------------------------------------------- See Row 8 of cover page for each Reporting Person. ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS -------------------------------------------- If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: Yes Page 13 of 17 Pages SIGNATURES ---------- After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: February ___, 2006 COMMUNICATIONS VENTURES III, L.P. By: /s/ Roland A. Van der Meer By ComVen III, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMMUNICATIONS VENTURES III CEO & ENTREPRENEURS' FUND, L.P. By: /s/ Roland A. Van der Meer By ComVen III, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMVEN III, L.L.C. By: /s/ Roland A. Van der Meer ------------------------------ Roland A. Van der Meer, Member COMVENTURES IV, L.P. By: /s/ Roland A. Van der Meer By ComVen IV, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMVENTURES IV CEO FUND, L.P. By: /s/ Roland A. Van der Meer By ComVen IV, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMVENTURES IV ENTREPRENEURS' FUND, L.P. By: /s/ Roland A. Van der Meer By ComVen IV, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member Page 14 of 17 Pages COMVEN IV, L.L.C. By: /s/ Roland A. Van der Meer ------------------------------ Roland A. Van der Meer, Member ROLAND A. VAN DER MEER By: /s/ Roland A. Van der Meer ------------------------------ Roland A. Van der Meer MICHAEL P. ROLNICK By: /s/ Michael P. Rolnick ------------------------------ Michael P. Rolnick The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative other than an executive officer or general partner of the filing person, evidence of the representative's authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature. NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See ss.240.13d-7 for other parties for whom copies are to be sent. Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001) http://www.sec.gov/divisions/corpfin/forms/13g.htm Last update: 01/05/2002 Page 15 of 17 Pages EXHIBIT INDEX ------------- Found on Sequentially Exhibit Numbered Page - ------- ------------- Exhibit A: Agreement of Joint Filing 16 Page 16 of 17 Pages EXHIBIT A Agreement of Joint Filing The undersigned hereby agree that a single Schedule 13G (or any amendment thereto) relating to the Common Stock of Arbinet-thexchange, Inc. shall be filed on behalf of each of the undersigned and that this Agreement shall be filed as an exhibit to such Schedule 13G. Date: February ___, 2006 COMMUNICATIONS VENTURES III, L.P. By: /s/ Roland A. Van der Meer By ComVen III, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMMUNICATIONS VENTURES III CEO & ENTREPRENEURS' FUND, L.P. By: /s/ Roland A. Van der Meer By ComVen III, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMVEN III, L.L.C. By: /s/ Roland A. Van der Meer ------------------------------ Roland A. Van der Meer, Member COMVENTURES IV, L.P. By: /s/ Roland A. Van der Meer By ComVen IV, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMVENTURES IV CEO FUND, L.P. By: /s/ Roland A. Van der Meer By ComVen IV, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member COMVENTURES IV ENTREPRENEURS' FUND, L.P. By: /s/ Roland A. Van der Meer By ComVen IV, L.L.C., its general partner ------------------------------ Roland A. Van der Meer, Member Page 17 of 17 Pages COMVEN IV, L.L.C. By: /s/ Roland A. Van der Meer ------------------------------ Roland A. Van der Meer, Member ROLAND A. VAN DER MEER By: /s/ Roland A. Van der Meer ------------------------------ Roland A. Van der Meer MICHAEL P. ROLNICK By: /s/ Michael P. Rolnick ------------------------------ Michael P. Rolnick -----END PRIVACY-ENHANCED MESSAGE-----