UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

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

Date of Report (Date of earliest event reported): December 22, 2004

AmerisourceBergen Corporation

(Exact name of Registrant as specified in its charter)

Delaware	1-16671	23-3079390
(State or Other Jurisdiction of Incorporation or Organization)	Commission File Number	(I.R.S. Employer Identification Number)

1300 Morris Drive Chesterbrook, PA	19087
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (610) 727-7000

N/A

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

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01. Other Events.

On December 22, 2004, AmerisourceBergen Corporation (the “Registrant”) issued a news release reducing its estimate of earnings for the fiscal year ending September 30, 2005, disclosing an estimate of earnings for the fiscal quarter ending December 31, 2004 and announcing a conference call to discuss the foregoing matters. A copy of the news release is filed as Exhibit 99.1 to this report and incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(c) Exhibits.

99.1 News Release dated December 22, 2004

SIGNATURES

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

	AMERISOURCEBERGEN CORPORATION
Date: December 22, 2004	By:	/s/ Michael D. DiCandilo
	Name:	Michael D. DiCandilo
	Title:	Senior Vice President
		and Chief Financial Officer