UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No.     )

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AmerisourceBergen Corporation
(Name of Registrant as Specified In Its Charter)
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  *** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on March 11, 2021. AMERISOURCEBERGEN CORPORATION Meeting Information Meeting Type: Annual Meeting For holders as of: January 11, 2021 Date: March 11, 2021 Time: 3:00 PM EST Location: Meeting live via the Internet-please visit www.virtualshareholdermeeting.com/ABC2021. The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/ABC2021 and be sure to have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page). AMERISOURCEBERGEN CORPORATION 227 WASHINGTON STREET CONSHOHOCKEN, PA 19428 CAROLYN TRACZYKIEWICZ You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. D30092-P47495-Z78929 See the reverse side of this notice to obtain proxy materials and voting instructions.

  D30093-P47495-Z78929 How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENTLETTER TO STOCKHOLDERSANNUAL REPORT ON FORM 10-K How to View Online: Have the information that is printed in the box marked by the arrowXXXX XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET:www.proxyvote.com 2) BY TELEPHONE:1-800-579-1639 3) BY E-MAIL*:sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrowXXXX XXXX XXXX XXXX (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before February 25, 2021 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote By Internet: Before The Meeting: Go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. During The Meeting: Go to www.virtualshareholdermeeting.com/ABC2021. Have the information that is printed in the box marked by the arrowXXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

  Voting Items The Board of Directors recommends you vote FOR all of the listed nominees and FOR proposals 2 and 3. 1.Election of Ten Directors. Nominees: 1a. Ornella Barra 1b. Steven H. Collis 1c. D. Mark Durcan 2. Ratification of Er nst & Young LLP as the Company's independent registered public accounting firm for fiscal year 2021. 3.Advisory vote to approve the compensation of named executive officers. The Board of Directors recommends you vote AGAINST proposal 4. 4.Stockholder proposal, if properly presented, to adopt a policy that the Chair of the Board be an Independent Director. 1d. Richard W. Gochnauer 1e. Lon R. Greenberg NOTE: In their discretion, the proxy holders may vote on such other business as may properly come before the meeting or any adjournment thereof. 1f. Jane E. Henney, M.D. 1g. Kathleen W. Hyle 1h. Michael J. Long 1i.Henry W. McGee D30094-P47495-Z78929

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