SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC 20549

                                 _____________

                                  FORM 8-K/A

                                CURRENT REPORT

                    PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                                 _____________

       Date of Report (Date of earliest event reported): August 29, 2001

                         AmerisourceBergen Corporation
            (Exact name of Registrant as specified in its charter)


                                                                                     
                Delaware                                   333-61440                           23-3079390
     (State or Other Jurisdiction                  (Commission File Number)                 (I.R.S. Employer
   of Incorporation or Organization)                                                       Identification No.)


                                 _____________

                         1300 Morris Drive, Suite 100
                     Chesterbrook, Pennsylvania 19087-5594
  (Address, Including Zip Code, and Telephone Number, Including Area Code, of
                   Registrant's Principal Executive Offices)

                                 _____________

         (Former name or former address, if changed since last report)

                                 _____________


Item 2.  Acquisition and Disposition of Assets.
         -------------------------------------

         Effective August 29, 2001, pursuant to the Agreement and Plan of
Merger, dated as of March 16, 2001, among AmerisourceBergen Corporation,
formerly known as AABB Corporation ("AmerisourceBergen"), AmeriSource Health
Corporation ("AmeriSource"), Bergen Brunswig Corporation ("Bergen"), A-Sub
Acquisition Corp. and B-Sub Acquisition Corp., AmeriSource and Bergen combined
their businesses by merging with acquisition subsidiaries of AmerisourceBergen
(the "Merger"). AmerisourceBergen reported the Merger in a Form 8-K dated August
29, 2001 (filed August 30, 2001). By this amendment, AmerisourceBergen is filing
the unaudited pro forma financial information required by Item 7(b).

Item 7.  Financial Statements and Exhibits
         ---------------------------------

         (b)      AmerisourceBergen incorporates by reference herein the section
                  entitled "AmerisourceBergen Corporation Unaudited Pro Forma
                  Consolidated Condensed Financial Information" in its
                  Registration Statement on Form S-4 (No. 333-71942) filed with
                  the Securities and Exchange Commission on October 19, 2001 and
                  effective as of October 26, 2001. This section, which includes
                  an introduction and the following unaudited pro forma
                  financial information, is included as Exhibit 99.3 hereto:

                  (i)     Unaudited Pro Forma Consolidated Condensed Balance
                          Sheet as of June 30, 2001;
                  (ii)    Unaudited Pro Forma Consolidated Condensed Statement
                          of Operations for the year ended September 30, 2000;
                  (iii)   Unaudited Pro Forma Consolidated Condensed Statement
                          of Operations for the nine months ended June 30,
                          2001;
                  (iv)    Notes to Unaudited Pro Forma Consolidated Condensed
                          Financial Information.

         (c)      Exhibits

                  99.3    AmerisourceBergen Corporation Unaudited Pro Forma
                          Consolidated Condensed Financial Information,
                          including the Unaudited Pro Forma Consolidated
                          Condensed Balance Sheet as of June 30, 2001, Unaudited
                          Pro Forma Consolidated Condensed Statement of
                          Operations for the year ended September 30, 2000,
                          Unaudited Pro Forma Consolidated Condensed Statement
                          of Operations for the nine months ended June 30, 2001,
                          and Notes to Unaudited Pro Forma Consolidated
                          Condensed Financial Information (incorporated by
                          reference to AmerisourceBergen's Registration
                          Statement on Form S-4 (No. 333-71942) filed with the
                          Securities and Exchange Commission on October 19, 2001
                          and effective as of October 26, 2001).


     Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended, the Registrant has duly caused this report to be signed on its behalf
by the undersigned hereunto duly authorized.

                                       AMERISOURCEBERGEN CORPORATION



Date:  October 29, 2001                By:     /s/  Neil F. Dimick
                                           -------------------------------------
                                           Name:  Neil F. Dimick
                                           Title: Executive Vice President and
                                                  Chief Financial Officer


                                 EXHIBIT INDEX


Number      Exhibit

99.3        AmerisourceBergen Corporation Unaudited Pro Forma Consolidated
            Condensed Financial Information, including the Unaudited Pro Forma
            Consolidated Condensed Balance Sheet as of June 30, 2001, Unaudited
            Pro Forma Consolidated Condensed Statement of Operations for the
            year ended September 30, 2000, Unaudited Pro Forma Consolidated
            Condensed Statement of Operations for the nine months ended June 30,
            2001, and Notes to Unaudited Pro Forma Consolidated Condensed
            Financial Information (incorporated by reference to
            AmerisourceBergen's Registration Statement on Form S-4 (No. 333-
            71942) filed with the Securities and Exchange Commission on October
            19, 2001 and effective as of October 26, 2001).