Page 1 of 13 Pages UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities exchange Act of 1934 (AMENDMENT NO.1)* UNION PAC CORP ----------------------------------------------------- (NAME OF ISSUER) COM ----------------------------------------------------- (TITLE OF CLASS OF SECURITIES) 907818108 ----------------------------------------------------- (CUSIP NUMBER) December 31, 2001 ----------------------------------------------------- (Date of event which requires filing of this Statement) NOTE: A MAJORITY OF THE SHARES REPORTED IN THIS SCHEDULE 13G ARE HELD BY UNAFFILIATED THIRD-PARTY CLIENT ACCOUNTS MANAGED BY ALLIANCE CAPITAL MANAGEMENT L.P., AS INVESTMENT ADVISER. (ALLIANCE CAPITAL MANAGEMENT L.P. IS A MAJORITY-OWNED SUBSIDIARY OF AXA FINANCIAL, INC.) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: X Rule 13d-1(b) Rule 13d-1(c) Rule 13d-1(d) * The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be 'filed' for the purpose of Section 18 of the Securities Exchange Act of 1934 ('Act') or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). (CONTINUED ON FOLLOWING PAGE(S)) CUSIP NO. 907818108 13G Page 2 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Assurances I.A.R.D. Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 8,328,529 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 5,290,053 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 19,588,915 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 151,790 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 19,740,705 (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.9% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 907818108 13G Page 3 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Assurances Vie Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 8,328,529 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 5,290,053 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 19,588,915 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 151,790 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 19,740,705 REPORTING PERSON (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.9% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 907818108 13G Page 4 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Conseil Vie Assurance Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 8,328,529 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 5,290,053 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 19,588,915 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 151,790 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 19,740,705 REPORTING PERSON (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.9% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 907818108 13G Page 5 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Courtage Assurance Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 8,328,529 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 5,290,053 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 19,588,915 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 151,790 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 19,740,705 (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.9% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 907818108 13G Page 6 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [ ] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 8,328,529 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 5,290,053 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 19,588,915 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 151,790 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 19,740,705 (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.9% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 907818108 13G Page 7 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Financial, Inc. 13-3623351 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [ ] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION State of Delaware NUMBER OF SHARES 5. SOLE VOTING POWER 8,279,829 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 5,290,053 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 19,588,915 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 1,390 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 19,590,305 REPORTING PERSON (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.9% 12. TYPE OF REPORTING PERSON * HC * SEE INSTRUCTIONS BEFORE FILLING OUT! 13G Page 8 of 13 Pages Item 1(a) Name of Issuer: UNION PAC CORP Item 1(b) Address of Issuer's Principal Executive Offices: 1416 Dodge St Omaha, NE 68179- Item 2(a) and (b) Name of Person Filing and Address of Principal Business Office: AXA Conseil Vie Assurance Mutuelle, AXA Assurances I.A.R.D Mutuelle, and AXA Assurances Vie Mutuelle, 370, rue Saint Honore 75001 Paris, France AXA Courtage Assurance Mutuelle 26, rue Louis le Grand 75002 Paris, France as a group (collectively, the 'Mutuelles AXA'). AXA 25, avenue Matignon 75008 Paris, France AXA Financial, Inc. 1290 Avenue of the Americas New York, New York 10104 (Please contact Patrick Meehan at (212) 314-5644 with any questions.) 13G Page 9 of 13 Pages Item 2(c) Citizenship: Mutuelles AXA and AXA - France AXA Financial, Inc. - Delaware Item 2(d) Title of Class of Securities: COM Item 2(e) Cusip Number: 907818108 Item 3. Type of Reporting Person: AXA Financial, Inc. as a parent holding company, in accordance with 240.13d-1(b)(ii)(G). The Mutuelles AXA, as a group, acting as a parent holding company. AXA as a parent holding company. 13G Page 10 of 13 Pages Item 4. Ownership as of December 31, 2001 (a) Amount Beneficially Owned: 19,740,705 shares of common stock beneficially owned including: No. of Shares --------------------- The Mutuelles AXA, as a group 0 AXA 0 AXA Entity or Entities acquired solely for investment purposes: Common Stock AXA Rosenberg Investment Management LLC 150,400 AXA Financial, Inc. 0 Subsidiaries: Alliance Capital Management L.P. acquired solely for investment purposes on behalf of client discretionary investment advisory accounts: Common Stock 19,566,105 The Equitable Life Assurance Society of the United States acquired solely for investment purposes: Common Stock 24,200 ------------- Total 19,740,705 ============= Each of the Mutuelles AXA, as a group, and AXA expressly declares that the filing of this Schedule 13G shall not be construed as an admission that it is, for purposes of Section 13(d) of the Exchange Act, the beneficial owner of any securities covered by this Schedule 13G. Each of the above subsidiaries of AXA Financial, Inc. operates under independent management and makes independent decisions. (b) Percent of Class: 7.9% ============= Page 11 of 13 Pages ITEM 4. Ownership as of December 31, 2001 (CONT.) (c) Deemed Voting Power and Disposition Power: (i) (ii) (iii) (iv) Deemed Deemed Deemed Deemed to have to have to have to have Sole Power Shared Power Sole Power Shared Power to Vote to Vote to Dispose to Dispose or to or to or to or to Direct Direct Direct the Direct the the Vote the Vote Disposition Disposition ------------ ------------ ------------ ------------ The Mutuelles AXA, as a group 0 0 0 0 AXA 0 0 0 0 AXA Entity or Entities: AXA Rosenberg 48,700 0 0 150,400 Investment Management LLC AXA Financial, Inc. 0 0 0 0 Subsidiaries: ------------ Alliance Capital 8,279,829 5,290,053 19,564,715 1,390 Management L.P. The Equitable Life 0 0 24,200 0 Assurance Society of the United States ------------ ------------ ------------ ------------ 8,328,529 5,290,053 19,588,915 151,790 ============ ============ ============ ============ Each of the above subsidiaries of AXA Financial, Inc. operates under independent management and makes independent voting and investment decisions. Page 12 of 13 Pages 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. ( ) Item 6. Ownership of More than Five Percent on behalf of Another Person. N/A Item 7. Identification and Classification of the Subsidiary which Acquired the Security Being Reporting on by the Parent Holding Company: This Schedule 13G is being filed by AXA Financial, Inc.; AXA, which owns AXA Financial, Inc.; and the Mutuelles AXA, which as a group control AXA: (X) in the Mutuelles AXAs' capacity, as a group, acting as a parent holding company with respect to the holdings of the following AXA entity or entities: (X) in AXA's capacity as a parent holding company with respect to the holdings of the following AXA entity or entities: AXA Rosenberg Investment Management LLC (X) in AXA Financial, Inc.'s capacity as a parent holding company with respect to the holdings of the following subsidiaries: (X) Alliance Capital Management L.P. (13-3434400), an investment adviser registered under Section 203 of the Investment Advisers Act of 1940. (X) The Equitable Life Assurance Society of the United States (13-5570651), an insurance company and an investment adviser registered under Section 203 of the Investment Advisers Act of 1940. Page 13 of 13 Pages Item 8. Identification and Classification of Members of the Group. N/A Item 9. Notice of Dissolution of Group: N/A Item 10. Certification: By signing below I certify that to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect. Signature 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 11, 2002 AXA FINANCIAL, INC.* /s/ Alvin H. Fenichel Alvin H. Fenichel Senior Vice President and Controller *Pursuant to the Joint Filing Agreement with respect to Schedule 13G attached hereto as Exhibit I, among AXA Financial, Inc., AXA Conseil Vie Assurance Mutuelle, AXA Assurances I.A.R.D Mutuelle, AXA Assurances Vie Mutuelle, AXA Courtage Assurance Mutuelle, and AXA, this statement Schedule 13G is filed on behalf of each of them.