-----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, WTMBT+O/uOYUvEZiQq1y1xalyY/ZzKdTeRSCXJEcO+nqbCsJZCxke4pMYASnJtUL snR8cLV1N4ohpCO8Xx+ioA== 0000902664-07-001954.txt : 20070604 0000902664-07-001954.hdr.sgml : 20070604 20070604122822 ACCESSION NUMBER: 0000902664-07-001954 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20070604 DATE AS OF CHANGE: 20070604 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: International Securities Exchange Holdings, Inc. CENTRAL INDEX KEY: 0001295230 STANDARD INDUSTRIAL CLASSIFICATION: SECURITY & COMMODITY BROKERS, DEALERS, EXCHANGES & SERVICES [6200] IRS NUMBER: 205219710 FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-80618 FILM NUMBER: 07896446 BUSINESS ADDRESS: STREET 1: 60 BROAD STREET CITY: NEW YORK STATE: NY ZIP: 10004 BUSINESS PHONE: 212-943-2400 MAIL ADDRESS: STREET 1: 60 BROAD STREET CITY: NEW YORK STATE: NY ZIP: 10004 FORMER COMPANY: FORMER CONFORMED NAME: International Securities Exchange, Inc. DATE OF NAME CHANGE: 20040623 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: DAVIDSON KEMPNER PARTNERS CENTRAL INDEX KEY: 0000928549 IRS NUMBER: 133393346 FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: 885 THIRD AVENUE CITY: NEW YORK STATE: NY ZIP: 10022 BUSINESS PHONE: 2124464020 MAIL ADDRESS: STREET 1: 885 THIRD AVENUE CITY: NEW YORK STATE: NY ZIP: 10022 SC 13G 1 sc13g.txt INTERNATIONAL SECURITIES EXCHANGE HOLDINGS, INC. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ---------------- SCHEDULE 13G (Rule 13d-102) ---------------- INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 INTERNATIONAL SECURITIES EXCHANGE HOLDINGS, INC. (Name of Issuer) CLASS A COMMON STOCK, $0.01 PAR VALUE PER SHARE (Title of Class of Securities) 46031W204 (CUSIP Number) May 24, 2007 (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 (the "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). Schedule 13G CUSIP No. 46031W204 PAGE 2 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Davidson Kempner Partners - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 242,128 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 242,128 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 242,128 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.6% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON PN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 3 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Davidson Kempner Institutional Partners, L.P. - ------------------------------------------------------------------------------ (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 - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 611,271 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 611,271 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 611,271 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 1.6% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON PN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 4 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON M.H. Davidson & Co. - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 48,480 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 48,480 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 48,480 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.1% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON PN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 5 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Davidson Kempner International, Ltd. - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION British Virgin Islands - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 1,090,342 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,090,342 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,090,342 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 2.8% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON CO - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 6 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Serena Limited - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 21,079 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 21,079 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 21,079 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.1% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON CO - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 7 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON MHD Management Co. - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 242,128 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 242,128 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 242,128 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.6% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON PN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 8 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Davidson Kempner Advisers Inc. - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 611,271 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 611,271 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 611,271 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 1.6% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IA - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 9 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Davidson Kempner International Advisors, LLC - ------------------------------------------------------------------------------ (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 - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 1,111,421 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 1,111,421 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,111,421 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 2.9% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON OO - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 10 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Thomas L. Kempner, Jr. - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 11 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Marvin H. Davidson - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 12 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Stephen M. Dowicz - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 13 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Scott E. Davidson - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 14 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Michael J. Leffell - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 15 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Timothy I. Levart - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United Kingdom & United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 16 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Robert J. Brivio, Jr. - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 17 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Eric P. Epstein - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 18 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Anthony A. Yoseloff - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 19 OF 34 - ------------------------------------------------------------------------------ (1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Avram Z. Friedman - ------------------------------------------------------------------------------ (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] - ------------------------------------------------------------------------------ (3) SEC USE ONLY - ------------------------------------------------------------------------------ (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States - ------------------------------------------------------------------------------ NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------ BENEFICIALLY (6) SHARED VOTING POWER 2,013,300 OWNED BY ------------------------------------------------------ EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------ PERSON WITH (8) SHARED DISPOSITIVE POWER 2,013,300 - ------------------------------------------------------------------------------ (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,013,300 - ------------------------------------------------------------------------------ (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - ------------------------------------------------------------------------------ (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.2% - ------------------------------------------------------------------------------ (12) TYPE OF REPORTING PERSON IN - ------------------------------------------------------------------------------ Schedule 13G CUSIP No. 46031W204 PAGE 20 OF 34 - ------------------------------------------------------------------------------ ITEM 1(a). NAME OF ISSUER: International Securities Exchange Holdings, Inc. (the "Company") ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 60 Broad Street New York, NY 10004 ITEM 2(a). NAME OF PERSON FILING: This Statement is filed by each of the entities and persons listed below, all of whom together are referred to herein as the "Reporting Persons": (i) Davidson Kempner Partners, a New York limited partnership ("DKP"); (ii) Davidson Kempner Institutional Partners, L.P., a Delaware limited partnership ("DKIP"); (iii) M. H. Davidson & Co., a New York limited partnership ("CO"); (iv) Davidson Kempner International, Ltd., a British Virgin Islands corporation ("DKIL"); (v) Serena Limited, a Cayman Islands corporation ("Serena"); (vi) MHD Management Co., a New York limited partnership and the general partner of DKP ("MHD"); (vii) Davidson Kempner Advisers Inc., a New York corporation and the general partner of DKIP ("DKAI"), which is registered as an investment adviser with the U.S. Securities and Exchange Commission; (viii) Davidson Kempner International Advisors, L.L.C., a Delaware limited liability company and the manager of DKIL and Serena ("DKIA"); and (ix) Messrs. Thomas L. Kempner, Jr., Marvin H. Davidson, Stephen M. Dowicz, Scott E. Davidson, Michael J. Leffell, Timothy I. Levart, Robert J. Brivio, Jr., Anthony A. Yoseloff, Eric P. Epstein and Avram Z. Friedman (collectively, the "Principals"), who are the general partners of CO and MHD, the sole managing members of DKIA and the sole stockholders of DKAI. ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE: The address of the principal business office of each of the Reporting Persons is c/o Davidson Kempner Partners, 65 East 55th Street, 19th Floor, New York, New York 10022. Schedule 13G CUSIP No. 46031W204 PAGE 21 OF 34 ITEM 2(c). CITIZENSHIP: (i) DKP - a New York limited partnership (ii) DKIP - a Delaware limited partnership (iii) CO - a New York limited partnership (iv) DKIL - a British Virgin Islands corporation (v) Serena - a Cayman Islands corporation (vi) MHD - a New York limited partnership (vii) DKAI - a New York corporation (viii) DKIA - a Delaware limited liability company (ix) Thomas L. Kempner, Jr. - United States (x) Marvin H. Davidson - United States (xi) Stephen M. Dowicz - United States (xii) Scott E. Davidson - United States (xiii) Michael J. Leffell - United States (xiv) Timothy I. Levart - United Kingdom & United States (xv) Robert J. Brivio, Jr. - United States (xvi) Eric P. Epstein - United States (xvii) Anthony A. Yoseloff - United States (xviii) Avram Z. Friedman - United States ITEM 2(d). TITLE OF CLASS OF SECURITIES: CLASS A COMMON STOCK, $0.01 PAR VALUE PER SHARE ITEM 2(e). CUSIP NUMBER: 46031W204 Schedule 13G CUSIP No. 46031W204 PAGE 22 OF 34 ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: (a) [ ] Broker or dealer registered under Section 15 of the Act; (b) [ ] Bank as defined in Section 3(a)(6) of the Act; (c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act; (d) [ ] Investment Company registered under Section 8 of the Investment Company Act of 1940; (e) [ ] Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940: see Rule 13d-1(b)(1)(ii)(E); (f) [ ] Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F); (g) [ ] Parent Holding Company, in accordance with Rule 13d-1(b)(ii)(G); (h) [ ] Savings Associations as defined in Section 3(b) of the Federal Deposit Insurance Act; (i) [ ] Church Plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940; (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J). ITEM 4. OWNERSHIP. The Principals may be deemed to beneficially own an aggregate of 2,013,300 shares as a result of their voting and dispositive power over the 2,013,300 shares beneficially owned by DKP, DKIP, DKIL, Serena, and CO. DKIA may be deemed to beneficially own the 1,090,342 shares beneficially owned by DKIL and the 21,079 shares beneficially owned by Serena as a result of its voting and dispositive power over those shares. DKAI may be deemed to beneficially own the 611,271 shares beneficially owned by DKIP as a result of its voting and dispositive power over those shares. MHD may be deemed to beneficially own the 242,128 shares beneficially owned by DKP as a result of its voting and dispositive power over those shares. A. DKP (a) Amount beneficially owned: 242,128 (b) Percent of class: 0.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 Schedule 13G CUSIP No. 46031W204 PAGE 23 OF 34 (ii) shared power to vote or to direct the vote: 242,128 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 242,128 B. DKIP (a) Amount beneficially owned: 611,271 (b) Percent of class: 1.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 611,271 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 611,271 C. CO (a) Amount beneficially owned: 48,480 (b) Percent of class: 0.1% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 48,480 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 48,480 D. DKIL (a) Amount beneficially owned: 1,090,342 (b) Percent of class: 2.8% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 1,090,342 (iii) sole power to dispose or to direct the disposition: 0 Schedule 13G CUSIP No. 46031W204 PAGE 24 OF 34 (iv) shared power to dispose or to direct the disposition: 1,090,342 E. Serena (a) Amount beneficially owned: 21,079 (b) Percent of class: 0.1% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 21,079 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 21,079 F. MHD (a) Amount beneficially owned: 242,128 (b) Percent of class: 0.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 242,128 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 242,128 G. DKAI (a) Amount beneficially owned: 611,271 (b) Percent of class: 1.6% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 611,271 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 611,271 H. DKIA (a) Amount beneficially owned: 1,111,421 Schedule 13G CUSIP No. 46031W204 PAGE 25 OF 34 (b) Percent of class: 2.9% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 1,111,421 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 1,111,421 I. Thomas L. Kempner, Jr. (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 J. Marvin H. Davidson (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 K. Stephen M. Dowicz (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% Schedule 13G CUSIP No. 46031W204 PAGE 26 OF 34 (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 L. Scott E. Davidson (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 M. Michael J. Leffell (a) Amount beneficially owned. 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 N. Timothy I. Levart (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 Schedule 13G CUSIP No. 46031W204 PAGE 27 OF 34 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 O. Robert J. Brivio, Jr. (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 P. Eric P. Epstein (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 Q. Anthony A. Yoseloff (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 Schedule 13G CUSIP No. 46031W204 PAGE 28 OF 34 (iv) shared power to dispose or to direct the disposition: 2,013,300 R. Avram Z. Friedman (a) Amount beneficially owned: 2,013,300 (b) Percent of class: 5.2% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: 0 (ii) shared power to vote or to direct the vote: 2,013,300 (iii) sole power to dispose or to direct the disposition: 0 (iv) shared power to dispose or to direct the disposition: 2,013,300 ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. Not applicable. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. The partners, members or stockholders of each of the Reporting Persons, including the Principals, have the right to participate in the receipt of dividends from, or proceeds from the sale of, the securities held for the account of such Reporting Person in accordance with their ownership interests in such Reporting Person. The Reporting Persons disclaim all beneficial ownership as affiliates of a registered investment adviser, and, in any case, disclaim beneficial ownership except as to the extent of their pecuniary interest in the shares. The Reporting Persons have elected to file Schedule 13G although such filing may not be required under the Act. ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY. Not applicable. ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. See Item 4. ITEM 9. NOTICE OF DISSOLUTION OF GROUP. Not applicable. Schedule 13G CUSIP No. 46031W204 PAGE 29 OF 34 ITEM 10. CERTIFICATION. (if filing pursuant to Rule 13d-1(c)) Each of the Reporting Persons hereby makes the following certification: By signing below we certify that, to the best of our knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. Schedule 13G CUSIP No. 46031W204 PAGE 30 OF 34 SIGNATURES After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct. DATED: June 4, 2007 DAVIDSON KEMPNER PARTNERS By: MHD Management Co., its General Partner /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Managing Partner DAVIDSON KEMPNER INSTITUTIONAL PARTNERS, L.P. By: Davidson Kempner Advisers Inc., its General Partner /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: President M.H. DAVIDSON & CO. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Managing Partner DAVIDSON KEMPNER INTERNATIONAL, LTD. By: Davidson Kempner International Advisors, L.L.C., its Investment Manager /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Executive Managing Member SERENA LIMITED By: Davidson Kempner International Advisors, L.L.C., its Investment Manager /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Executive Managing Member Schedule 13G CUSIP No. 46031W204 PAGE 31 OF 34 MHD MANAGEMENT CO. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Managing Partner DAVIDSON KEMPNER ADVISERS INC. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: President DAVIDSON KEMPNER INTERNATIONAL ADVISORS, L.L.C. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Executive Managing Member /s/ Thomas L. Kempner, Jr. ---------------------------------- Thomas L. Kempner, Jr. /s/ Marvin H. Davidson ---------------------------------- Marvin H. Davidson /s/ Stephen M. Dowicz ---------------------------------- Stephen M. Dowicz /s/ Scott E. Davidson ---------------------------------- Scott E. Davidson /s/ Michael J. Leffell ---------------------------------- Michael J. Leffell /s/ Timothy I. Levart ---------------------------------- Timothy I. Levart /s/ Robert J. Brivio, Jr. ------------------------- Robert J. Brivio, Jr. /s/ Eric P. Epstein ---------------------------------- Eric P. Epstein /s/ Anthony A. Yoseloff ---------------------------------- Anthony A. Yoseloff /s/ Avram Z. Friedman ---------------------------------- Avram Z. Friedman Schedule 13G CUSIP No. 46031W204 PAGE 32 OF 34 EXHIBIT 1 JOINT ACQUISITION STATEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G, shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate. DATED: June 4, 2007 DAVIDSON KEMPNER PARTNERS By: MHD Management Co., its General Partner /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Managing Partner DAVIDSON KEMPNER INSTITUTIONAL PARTNERS, L.P. By: Davidson Kempner Advisers Inc., its General Partner /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: President M.H. DAVIDSON & CO. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Managing Partner DAVIDSON KEMPNER INTERNATIONAL, LTD. By: Davidson Kempner International Advisors, L.L.C., its Investment Manager /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Executive Managing Member Schedule 13G CUSIP No. 46031W204 PAGE 33 OF 34 SERENA LIMITED By: Davidson Kempner International Advisors, L.L.C., its Investment Manager /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Executive Managing Member MHD MANAGEMENT CO. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Managing Partner DAVIDSON KEMPNER ADVISERS INC. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: President DAVIDSON KEMPNER INTERNATIONAL ADVISORS, L.L.C. /s/ Thomas L. Kempner, Jr. ---------------------------------- Name: Thomas L. Kempner, Jr. Title: Executive Managing Member /s/ Thomas L. Kempner, Jr. ---------------------------------- Thomas L. Kempner, Jr. /s/ Marvin H. Davidson ---------------------------------- Marvin H. Davidson /s/ Stephen M. Dowicz ---------------------------------- Stephen M. Dowicz /s/ Scott E. Davidson ---------------------------------- Scott E. Davidson /s/ Michael J. Leffell ---------------------------------- Michael J. Leffell /s/ Timothy I. Levart ---------------------------------- Timothy I. Levart /s/ Robert J. Brivio, Jr. ------------------------- Robert J. Brivio, Jr. Schedule 13G CUSIP No. 46031W204 PAGE 34 OF 34 /s/ Eric P. Epstein ---------------------------------- Eric P. Epstein /s/ Anthony A. Yoseloff ---------------------------------- Anthony A. Yoseloff /s/ Avram Z. Friedman ---------------------------------- Avram Z. Friedman -----END PRIVACY-ENHANCED MESSAGE-----