Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
COLLIS STEVEN H
  2. Issuer Name and Ticker or Trading Symbol
AMERISOURCEBERGEN CORP [ABC]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive Vice President
(Last)
(First)
(Middle)
1300 MORRIS DRIVE
3. Date of Earliest Transaction (Month/Day/Year)
01/29/2010
(Street)

CHESTERBROOK, PA 19087
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 01/29/2010   M   3,000 A $ 13.3183 42,092 D  
Common Stock 01/29/2010   M   2 A $ 13.3197 42,094 D  
Common Stock 01/29/2010   M   124,099 A $ 17.2496 166,193 D  
Common Stock 01/29/2010   S   124,099 D $ 27.474 42,094 D  
Common Stock 02/01/2010   M   18,967 A $ 17.2496 61,061 D  
Common Stock 02/01/2010   S   18,969 D $ 27.435 44,648 (1) D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Nonqualified Stock Option (right to buy) $ 13.3183 01/29/2010   M     3,000 08/08/2002 08/08/2011 Common Stock 3,000 $ 13.3183 0 D  
Nonqualified Stock Option (right to buy) $ 13.3197 01/29/2010   M     2 08/08/2002 08/08/2012 Common Stock 2 $ 13.3197 0 D  
Nonqualified Stock Option (right to buy) $ 17.2496 01/29/2010   M     124,099 04/23/2003 04/23/2012 Common Stock 124,099 $ 17.2496 18,967 D  
Nonqualified Stock Option (right to buy) $ 17.2496 02/01/2010   M     18,967 04/23/2003 04/23/2012 Common Stock 18,967 $ 17.2496 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
COLLIS STEVEN H
1300 MORRIS DRIVE
CHESTERBROOK, PA 19087
      Executive Vice President  

Signatures

 John G. Chou for Steven H. Collis   02/02/2010
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Iincludes 2,556 shares acquired under the issuer's employee stock purchase plan.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.