Page 1 of 13 Pages UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities exchange Act of 1934 ()* QUANTUM CORP ----------------------------------------------------- (NAME OF ISSUER) COM DSSG ----------------------------------------------------- (TITLE OF CLASS OF SECURITIES) 747906204 ----------------------------------------------------- (CUSIP NUMBER) October 31, 2000 ----------------------------------------------------- (Date of Event Which Requires Filing of this Statement) 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. 747906204 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) [ ] (B) [X] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 10,537,665 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 2,146,162 October 31, 2000 BY EACH 7. SOLE DISPOSITIVE POWER 18,208,280 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,208,280 (Not to be construed as an admission of beneficial ownership) (On October 2, 2000, Alliance Capital Management L.P. ("Alliance") acquired beneficial ownership of 17,799,680 shares through its acquisition of the investment advisory assets of Sanford C. Bernstein & Co., Inc. ("Bernstein"), formerly a federally registered investment adviser. Pursuant to this acquisition, Bernstein assigned its investment management agreements to Alliance. Contact names and numbers for those persons formally with Bernstein remain the same as part of Alliance.) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 12.2% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 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) [ ] (B) [X] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 10,537,665 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 2,146,162 October 31, 2000 BY EACH 7. SOLE DISPOSITIVE POWER 18,208,280 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,208,280 (Not to be construed as an admission of beneficial ownership) (On October 2, 2000, Alliance Capital Management L.P. ("Alliance") acquired beneficial ownership of 17,799,680 shares through its acquisition of the investment advisory assets of Sanford C. Bernstein & Co., Inc. ("Bernstein"), formerly a federally registered investment adviser. Pursuant to this acquisition, Bernstein assigned its investment management agreements to Alliance. Contact names and numbers for those persons formally with Bernstein remain the same as part of Alliance.) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 12.2% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 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) [ ] (B) [X] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 10,537,665 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 2,146,162 October 31, 2000 BY EACH 7. SOLE DISPOSITIVE POWER 18,208,280 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,208,280 (Not to be construed as an admission of beneficial ownership) (On October 2, 2000, Alliance Capital Management L.P. ("Alliance") acquired beneficial ownership of 17,799,680 shares through its acquisition of the investment advisory assets of Sanford C. Bernstein & Co., Inc. ("Bernstein"), formerly a federally registered investment adviser. Pursuant to this acquisition, Bernstein assigned its investment management agreements to Alliance. Contact names and numbers for those persons formally with Bernstein remain the same as part of Alliance.) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 12.2% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 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) [ ] (B) [X] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 10,537,665 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 2,146,162 October 31, 2000 BY EACH 7. SOLE DISPOSITIVE POWER 18,208,280 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,208,280 (Not to be construed as an admission of beneficial ownership) (On October 2, 2000, Alliance Capital Management L.P. ("Alliance") acquired beneficial ownership of 17,799,680 shares through its acquisition of the investment advisory assets of Sanford C. Bernstein & Co., Inc. ("Bernstein"), formerly a federally registered investment adviser. Pursuant to this acquisition, Bernstein assigned its investment management agreements to Alliance. Contact names and numbers for those persons formally with Bernstein remain the same as part of Alliance.) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 12.2% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 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) [X] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 10,537,665 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 2,146,162 October 31, 2000 BY EACH 7. SOLE DISPOSITIVE POWER 18,208,280 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,208,280 (Not to be construed as an admission of beneficial ownership) (On October 2, 2000, Alliance Capital Management L.P. ("Alliance") acquired beneficial ownership of 17,799,680 shares through its acquisition of the investment advisory assets of Sanford C. Bernstein & Co., Inc. ("Bernstein"), formerly a federally registered investment adviser. Pursuant to this acquisition, Bernstein assigned its investment management agreements to Alliance. Contact names and numbers for those persons formally with Bernstein remain the same as part of Alliance.) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 12.2% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 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) [X] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION State of Delaware NUMBER OF SHARES 5. SOLE VOTING POWER 10,537,665 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 2,146,162 October 31, 2000 BY EACH 7. SOLE DISPOSITIVE POWER 18,208,280 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,208,280 (Not to be construed as an admission of beneficial ownership) (On October 2, 2000, Alliance Capital Management L.P. ("Alliance") acquired beneficial ownership of 17,799,680 shares through its acquisition of the investment advisory assets of Sanford C. Bernstein & Co., Inc. ("Bernstein"), formerly a federally registered investment adviser. Pursuant to this acquisition, Bernstein assigned its investment management agreements to Alliance. Contact names and numbers for those persons formally with Bernstein remain the same as part of Alliance.) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 12.2% 12. TYPE OF REPORTING PERSON * HC * SEE INSTRUCTIONS BEFORE FILLING OUT! Item 1(a) Name of Issuer: Page 8 of 13 Pages QUANTUM CORP Item 1(b) Address of Issuer's Principal Executive Offices: 500 MCCARTHY BLVD Milpitas, CA 95035 Item 2(a) and (b) Name of Person Filing and Address of Principal Business Office: AXA Conseil Vie Assurance Mutuelle, 100-101 Terrasse Boieldieu 92042 Paris La Defense France AXA Assurances I.A.R.D Mutuelle, and AXA Assurances Vie Mutuelle, 21, rue de Chateaudun 75009 Paris France AXA Courtage Assurance Mutuelle, 26, rue Louis le Grand 75002 Paris France as a group (collectively, the 'Mutuelles AXA'). AXA 9 Place Vendome 75001 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.) 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 DSSG Item 2(e) CUSIP Number: 747906204 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. Page 10 of 13 Pages Item 4. Ownership as of October 31, 2000: (a) Amount Beneficially Owned: 18,208,280 shares of common stock beneficially owned including:
No. of Shares --------------------- The Mutuelles AXA, as a group 0 AXA 0 AXA Entity or Entities: 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 18,202,280 18,202,280 ---------- Donaldson, Lufkin & Jenrette Securities Corporation held for investment purposes: Common Stock 6,000 6,000 (1) ---------- ----------- Total 18,208,280 =========== (1) On November 3, 2000, AXA, AXA Financial, Inc. ("AXA Financial"), The Equitable Life Assurance Society of the United States ("Equitable Life") and AXA Participations Belgium (collectively, the "AXA Sellers") sold all of their holdings of common stock of Donaldson, Lufkin & Jenrette, Inc. ("DLJ") to Credit Suisse Group ("CSG") and its designee Credit Suisse First Boston, Inc. pursuant to a Stock Purchase Agreement among the AXA Sellers and CSG dated as of August 30, 2000. Accordingly, AXA Financial, AXA, and the Mutuelles AXA (collectively, the "AXA Filers") disclaim beneficial ownership only respect to those securities reported in Item 4 of this Schedule 13G as beneficially owned by DLJ's subsidiaries Donaldson, Lufkin & Jenrette Securities Corporation and/or DLJ Asset Management Group, Inc. Further, this report shall not be deemed an admission that the AXA Filers are, as the date of this report, beneficial owners of or reporting persons concerning such securities for purposes of Section 13 or otherwise. 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: 12.2% ===========
ITEM 4. Ownership as of 10/31/2000(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: NONE AXA Financial, Inc. 0 0 0 0 Subsidiaries: - ------------ Alliance Capital Management L.P. 10,537,665 2,146,162 18,202,280 0 Donaldson, Lufkin & Jenrette Securities Corporation 0 0 6,000 0 ------------ ------------ ------------ ------------ TOTAL 10,537,665 2,146,162 18,208,280 0 ============ ============ ============ ============ 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 beneficially owns a majority interest in AXA Financial, Inc.; and the Mutuelles AXA, which as a group control AXA: ( ) 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; ( ) in AXA's capacity as a parent holding company with respect to the holdings of the following AXA entity or entities: (X) in AXA Financial, Inc.'s capacity as a parent holding company with respect to the holdings of its 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) Donaldson, Lufkin & Jenrette Securities Corporation (1) (13-2741729), a broker-dealer registered under Section 15 of the Securities and Exchange Act of 1934 and an investment adviser registered under Section 203 of the Investment Advisers Act of 1940. (1) On November 3, 2000, AXA, AXA Financial, Inc. ("AXA Financial"), The Equitable Life Assurance Society of the United States ("Equitable Life") and AXA Participations Belgium (collectively, the "AXA Sellers") sold all of their holdings of common stock of Donaldson, Lufkin & Jenrette, Inc. ("DLJ") to Credit Suisse Group ("CSG") and its designee Credit Suisse First Boston, Inc. pursuant to a Stock Purchase Agreement among the AXA Sellers and CSG dated as of August 30, 2000. Accordingly, AXA Financial, AXA, and the Mutuelles AXA (collectively, the "AXA Filers") disclaim beneficial ownership only respect to those securities reported in Item 4 of this Schedule 13G as beneficially owned by DLJ's subsidiaries Donaldson, Lufkin & Jenrette Securities Corporation and/or DLJ Asset Management Group, Inc. Further, this report shall not be deemed an admission that the AXA Filers are, as the date of this report, beneficial owners of or reporting persons concerning such securities for purposes of Section 13 or otherwise. 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: November 13, 2000 AXA FINANCIAL, INC.* 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.