SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

SCHEDULE 13G/A

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO RULE 13d-2(b)

(Amendment No. 1)

AMERISOURCEBERGEN CORP.
_____________________________________________________________________________
(Name of Issuer)

Common Stock
_____________________________________________________________________________
(Title of Class of Securities)

03071P102
_____________________________________________________________________________
(CUSIP Number)

December 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)
    p     Rule 13d-1(c)
    p     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 disclosures provided in a prior cover page.

The information required on 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).

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CUSIP No. 03071P102

13G/A

1	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Maverick Capital, Ltd. - 75-2482446
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*			(a) p (b) p
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Texas
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*			p
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0%
12	TYPE OF REPORTING PERSON* IA

*SEE INSTRUCTIONS BEFORE FILLING OUT

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SCHEDULE 13G/A

The Schedule 13G (the "Schedule 13G") relating to shares of common stock of AmerisourceBergen Corp. (the "Issuer") filed with the Securities and Exchange Commission on February 23, 2000, by Maverick Capital, Ltd., is hereby amended as set forth below.

Item 4	Ownership .
	(a)	Amount beneficially owned: 0
	(b)	Percent of class: 0%
	(c)	Number of shares as to which the person has:
		(i) Sole power to vote or to direct the vote: 0
		(ii) Shared power to vote or to direct the vote: 0
		(iii) Sole power to dispose or to direct the disposition of: 0
		(iv) Shared power to dispose or to direct the disposition of: 0
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 [X].
Item 10	Certification.
	Not applicable.

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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: March 12, 2002

	MAVERICK CAPITAL, LTD.


	By:	/s/ Sharyl Robertson __________________________________ Sharyl Robertson Chief Financial Officer

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AMERISOURCE HEALTH CORP SC 13G/A