SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 4) NALCO HOLDING COMPANY -------------------------------------------------------------------------------- (Name of Issuer) Common Stock, par value $0.01 per share -------------------------------------------------------------------------------- (Title of Class of Securities) 62985Q 10 1 -------------------------------------------------------------------------------- (CUSIP Number) Chinh Chu c/o The Blackstone Group 345 Park Avenue, New York, NY 10154 (212) 583-5000 -------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) Copy to: Richard A. Fenyes, Esq. Simpson Thacher & Bartlett LLP 425 Lexington Ave. New York, New York 10017 November 8, 2006 -------------------------------------------------------------------------------- (Date of Event which Requires Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Amendment No. 1, and is filing this schedule because of Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g), check the following box. [ ] CUSIP NO. 62985Q 10 1 ---------------------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITY ONLY) Blackstone Management Associates IV LLC ------- --------------------------------------------------------------------- ---------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] ------- -------------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------- -------------------------------------------------------------------------------------------------------------- 4 SOURCE OF FUNDS OO ------- -------------------------------------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------- -------------------------------------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ---------------------------------------------------------------------------------------------------------------------- 7 SOLE VOTING POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- NUMBER OF SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY EACH 238,299 shares (See Items 4 and 5) REPORTING PERSON WITH ------ ------------------------------------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 238,299 shares (See Items 4 and 5) ---------------------------------------------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,743,885 shares (See Items 4 and 5) ---------- ----------------------------------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (X) ---------- ----------------------------------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.71% ---------- ----------------------------------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON OO ---------------------------------------------------------------------------------------------------------------------- CUSIP NO. 62985Q 10 1 ---------------------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITY ONLY) Blackstone Capital Partners IV LP ------- ---------------------------------------------------------- --------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] ------- -------------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------- -------------------------------------------------------------------------------------------------------------- 4 SOURCE OF FUNDS OO ------- -------------------------------------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------- -------------------------------------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ---------------------------------------------------------------------------------------------------------------------- 7 SOLE VOTING POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- NUMBER OF SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY EACH REPORTING PERSON None WITH ------ ------------------------------------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER None ---------------------------------------------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,505,586 shares (See Items 4 and 5) ---------- ----------------------------------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (X) ---------- ----------------------------------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.55% ---------- ----------------------------------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON PN ---------------------------------------------------------------------------------------------------------------------- CUSIP NO. 62985Q 10 1 ---------------------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Blackstone Capital Partners IV-A LP ------- ---------------------------------------------------------- --------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] ------- -------------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------- -------------------------------------------------------------------------------------------------------------- 4 SOURCE OF FUNDS OO ------- -------------------------------------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------- -------------------------------------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ---------------------------------------------------------------------------------------------------------------------- 7 SOLE VOTING POWER None ------ ------------------------------------------------------------------------------------------- NUMBER OF SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY EACH REPORTING PERSON 103,421 shares (See Items 4 and 5) WITH ------ ------------------------------------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER None ------ ------------------------------------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 103,421 shares (See Items 4 and 5) ---------------------------------------------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 103,421 shares (See Items 4 and 5) ---------- ----------------------------------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (X) ---------- ----------------------------------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.07% ---------- ----------------------------------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON PN ---------------------------------------------------------------------------------------------------------------------- CUSIP NO. 62985Q 10 1 ---------------------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITY ONLY) Blackstone Family Investment Partnership IV-A LP ------- ---------------------------------------------------------- --------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] ------- -------------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------- -------------------------------------------------------------------------------------------------------------- 4 SOURCE OF FUNDS OO ------- -------------------------------------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------- -------------------------------------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ---------------------------------------------------------------------------------------------------------------------- 7 SOLE VOTING POWER None ------ ------------------------------------------------------------------------------------------- NUMBER OF SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY EACH REPORTING PERSON 134,878 shares (See Items 4 and 5) WITH ------ ------------------------------------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER None ------ ------------------------------------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 134,878 shares (See Items 4 and 5) ---------------------------------------------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 134,878 shares (See Items 4 and 5) ---------- ----------------------------------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (X) ---------- ----------------------------------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.09% ---------- ----------------------------------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON PN ---------------------------------------------------------------------------------------------------------------------- CUSIP NO. 62985Q 10 1 ---------------------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Peter G. Peterson ------- ---------------------------------------------------------- --------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] ------- -------------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY ------- -------------------------------------------------------------------------------------------------------------- 4 SOURCE OF FUNDS OO ------- -------------------------------------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------- -------------------------------------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION U.S.A. ---------------------------------------------------------------------------------------------------------------------- 7 SOLE VOTING POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- NUMBER OF SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY EACH 238,299 shares (See Items 4 and 5) REPORTING PERSON WITH ------ ------------------------------------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 238,299 shares (See Items 4 and 5) ---------------------------------------------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,743,885 shares (See Items 4 and 5) ---------- ----------------------------------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (X) ---------- ----------------------------------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.71% ---------- ----------------------------------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN ---------------------------------------------------------------------------------------------------------------------- CUSIP NO. 62985Q 10 1 ---------------------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Stephen A. Schwarzman ------- ---------------------------------------------------------- --------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] ------- ---------------------------------------------------------- --------------------------------------------------- 3 SEC USE ONLY ------- -------------------------------------------------------------------------------------------------------------- 4 SOURCE OF FUNDS OO ------- -------------------------------------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------- -------------------------------------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION U.S.A. ---------------------------------------------------------------------------------------------------------------------- 7 SOLE VOTING POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- NUMBER OF SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY EACH 238,299 shares (See Items 4 and 5) REPORTING PERSON WITH ------ ------------------------------------------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 6,505,586 ------ ------------------------------------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 238,299 shares (See Items 4 and 5) ---------------------------------------------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,743,885 shares (See Items 4 and 5) ---------- ----------------------------------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (X) ---------- ----------------------------------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.71% ---------- ----------------------------------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN ---------------------------------------------------------------------------------------------------------------------- This Amendment No. 4 supplements and amends Items 5, 6 and 7 of the Statement on Schedule 13D filed on November 24, 2004, as amended by Amendment No. 1 to the Statement on Schedule 13D filed on August 19, 2005, Amendment No. 2 to the Statement on Schedule 13D filed on August 24, 2005 and Amendment No. 3 to the Statement on Schedule 13D filed on March 23, 2006 (as so amended, the "Statement on Schedule 13D") by (i) Blackstone Management Associates IV LLC, a Delaware limited liability company ("BMA"), (ii) Blackstone Capital Partners IV LP, a Delaware limited partnership ("BCP IV"), (iii) Blackstone Capital Partners IV-A LP, a Delaware limited partnership ("BCP IV-A"), (iv) Blackstone Family Investment Partnership IV-A LP, a Delaware limited partnership ("BFIP IV" and, together with BCP IV and BCP IV-A, the "Blackstone Funds"), (v) Mr. Peter G. Peterson and (vi) Mr. Stephen A. Schwarzman (the foregoing, collectively, the "Reporting Persons"), each relating to the shares of common stock, par value $0.01 (the "Common Stock"), of Nalco Holding Company (the "Issuer"). Unless otherwise indicated, each capitalized term used but not otherwise defined herein shall have the meaning assigned to such term in the Statement on Schedule 13D. Responses to each item of this Amendment No. 4 to Statement on Schedule 13D are incorporated by reference into the response to each other item, as applicable. ITEM 5. INTEREST IN SECURITIES OF THE ISSUER Item 5 is hereby amended and supplemented by deleting it in its entirety and replacing it with the following: On December 30, 2005, Nalco LLC made a distribution of an aggregate of 38,029,261 shares of the Issuer's common stock to the members of Nalco LLC that qualified as a "venture capital operating company" (as defined in 29 C.F.R. sec. 2510.3-101(d)) in proportion to their membership interests pursuant to the terms of the previously reported Stockholders Agreement, which included the distribution of 19,068,658 shares to BCP IV, which was formerly a member of Nalco LLC. Following such distribution, BCP IV, and BCP IV-A and BFIP IV (which continued as members of Nalco LLC), beneficially held an aggregate of 19,767,140 shares of the Issuer's common stock, consisting of (i) 19,068,658 shares of which BCP IV was the record holder and (ii) 698,482 shares in which BCP IV-A and BFIP IV held an indirect beneficial economic interest based on the membership interests in Nalco LLC held by such funds. On March 21, 2006, Nalco LLC, Apollo Investment Fund V, L.P., BCP IV and GS Capital Partners 2000, L.P. (collectively, the "Selling Stockholders") sold an aggregate of 15,000,000 shares of Common Stock in connection with an underwritten offering registered on the registration statement on Form S-3 (File No. 333-130715) filed by the Issuer with the Securities and Exchange Commission on December 27, 2005, as supplemented by the prospectus supplement dated March 15, 2006 (the "Prospectus"). Following such sale, (i) BCP IV was the record holder of 13,684,684 shares of Common Stock and (ii) BFIP IV and BCP IV-A may have been deemed to beneficially hold an economic interest in 501,261 shares of Common Stock held of record by Nalco LLC, which collectively represented in the aggregate approximately 9.9% of the outstanding Common Stock of the Issuer. On November 8, 2006, Nalco LLC, Apollo Investment Fund V, L.P., BCP IV and GS Capital Partners 2000, L.P. (collectively, the "Selling Stockholders") sold an aggregate of 20,000,000 shares of Common Stock in connection with an underwritten offering registered on the registration statement on Form S-3 (File No. 333-130715) filed by the Issuer with the Securities and Exchange Commission on December 27, 2005, as supplemented by the prospectus supplement dated November 2, 2006 (the "Prospectus"). Following such sale, (i) BCP IV is the record holder of 6,505,586 shares of Common Stock and (ii) BFIP IV and BCP IV-A may be deemed to beneficially hold an economic interest in 238,299 shares of Common Stock held of record by Nalco LLC, which collectively represents in the aggregate approximately 4.71% of the outstanding Common Stock of the Issuer. The 6,743,885 shares of Common Stock shown as beneficially owned by the Blackstone Funds in this Amendment No. 4 to Schedule 13D reflect (i) the direct ownership of 6,505,586 shares of Common Stock by BCP IV and (ii) the percentage interest of BCP IV-A and BFIP IV in the 5,184,444 shares of Common Stock held of record by Nalco LLC, based on the combined percentage economic interest of BCP IV-A and BFIP IV in Nalco LLC, and excludes the balance of such shares which represent the other Sponsors' and management members' percentage interest in Nalco LLC. The shares of Common Stock shown as beneficially owned by BMA and the Founding Members include the shares of Common Stock shown as beneficially owned by the Blackstone Funds. Because voting and dispositive decisions of Nalco LLC with respect to the Common Stock require the approval of at least two of the Sponsors, the Blackstone Funds, BMA and the Founding Members each disclaim beneficial ownership of the Common Stock reported as beneficially owned by Nalco LLC or any of the other Sponsors, and the filing of this Amendment No. 4 to Schedule 13D shall not be construed as an admission that any such person is the beneficial owner of any such securities. (a) See the information contained on the cover pages to this Amendment No. 4 to Schedule 13D, which is incorporated herein by reference. The percentage of the class beneficially owned by each Reporting Person is based on 143,040,860 issued and outstanding shares of Common Stock, as reported by the Issuer in the Prospectus. (b) See the information contained on the cover pages to this Amendment No. 4 to Schedule 13D, which is incorporated herein by reference. (c) Except for the information set forth herein, or incorporated by reference herein, none of the Reporting Persons has effected any transaction relating to the Common Stock during the past 60 days. (d) In accordance with the terms of the Nalco LLC Limited Liability Company Operating Agreement and, if approved by the board of directors of Nalco LLC, the members of Nalco LLC have the right to receive dividends from and the proceeds from any sale of Common Stock in accordance with their membership interests in Nalco LLC. (e) November 8, 2006. ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER Item 6 is hereby amended and supplemented as follows: Underwriting Agreement On November 2, 2006, the Selling Stockholders entered into an Underwriting Agreement with the Issuer and Citigroup Global Markets Inc. (the "Underwriter") for the sale by the Selling Stockholders of an aggregate of 20,000,000 shares of Common Stock. Closing of the sale occurred on November 8, 2006. Pursuant to the terms of the Underwriting Agreement, each of the Issuer and the Selling Stockholders agreed, subject to certain exceptions, not to dispose of or hedge any of their Common Stock or securities convertible into or exchangeable for shares of Common Stock during the period that is 60 days from November 2, 2006, subject to an extension of up to 18 additional days under certain circumstances, except with the prior written consent of the Underwriter, with certain exceptions. References to, and descriptions of, the Underwriting Agreement as set forth in this Item 6 are qualified in their entirety by reference to the Underwriting Agreement filed herewith. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS Exhibit Title ------- ----- 1. Underwriting Agreement, dated as of November 2, 2006, among Nalco Holding Company, the Selling Stockholders and the Underwriter (incorporated herein by reference to Exhibit 99.1 to the Nalco Holding Company Current Report on Form 8-K filed with the SEC on November 6, 2006 (File No. 001-32342)). SIGNATURE After reasonable inquiry and to the best knowledge and belief of each of the undersigned, each of the undersigned certifies that the information set forth in this statement with respect to such person is true, complete and correct. Dated: November 16, 2006 BLACKSTONE MANAGEMENT ASSOCIATES IV LLC By: /s/ Chinh Chu --------------- Name: Chinh Chu Title: Member BLACKSTONE CAPITAL PARTNERS IV LP BLACKSTONE CAPITAL PARTNERS IV-A LP BLACKSTONE FAMILY INVESTMENT PARTNERSHIP IV-A LP By: Blackstone Management Associates IV LLC, its General Partner By: /s/ Chinh Chu ----------------- Name: Chinh Chu Title: Member /s/ Peter G. Peterson ------------------------ PETER G. PETERSON /s/ Stephen A. Schwarzman ---------------------------- STEPHEN A. SCHWARZMAN