Pricing Information Provided Orally by Underwriters Price and other terms of the offering conveyed orally (and included in a Rule 134 compliant pricing notice). Exhibit A FORM OF LOCK-UP AGREEMENT LOCK-UP AGREEMENT August 3, 2023 Gxxxxxx Sxxxx & Co. LLC 200 Xxxx Xxxxxx New York, NY 10282 Re: AmerisourceBergen Corporation — Public Offering Ladies and Gentlemen: The undersigned understands that the Underwriter (“you”) and the Dealers (in each case as defined in the Underwriting Agreement) propose to enter into an underwriting agreement (the “Underwriting Agreement”) with Walgreens Boots Alliance Holdings LLC, a Delaware limited liability company (the “Counterparty”), and AmerisourceBergen Corporation, a Delaware corporation (the “Issuer”), in connection with prepaid variable share forward transactions (each, a “VPF Transaction” and, together, the “VPF Transactions”) covering an aggregate of 10,500,000 shares of common stock of the Issuer (the “Common Stock”) and the public offering (the “Public Offering”) by the Underwriter of 7,293,548 shares of Common Stock. In connection with hedging their exposure under the VPF Transactions, on or prior to the Closing Date, the Dealers will borrow and sell Common Stock, directly or through affiliates, to the Underwriter. Capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Underwriting Agreement. In order to induce you to enter into the Underwriting Agreement and for other good and valuable consideration receipt of which is hereby acknowledged, the undersigned hereby agrees that, without the prior written consent of the Underwriter, the undersigned will not, during the period beginning on the date of this letter agreement (this “Letter Agreement”) and ending 30 days after the date of the Prospectus for the Offered Securities (such period, the “Restricted Period”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock (including, without limitation, Common Stock or such other securities which may be deemed to be beneficially owned by the undersigned in accordance with the rules and regulations of the Securities and Exchange Commission and securities which may be issued upon exercise of a stock option or warrant), or publicly disclose the intention to make any offer, sale, pledge or disposition, (2) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of the Common Stock or such other securities, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise or (3) cause to be filed or confidentially submitted any registration statement for, the registration of any shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock, in each case other than (A) pursuant to the VPF Transactions and the shares of Common Stock to be sold or transferred by or on behalf of the Dealers to the Underwriter pursuant to the Underwriting Agreement; (B) transfers as a bona fide gift or gifts, or for bona fide estate planning purposes; (C) distributions, transfers or exchanges of shares of Common Stock or any security, directly or indirectly, convertible into or exercisable or exchangeable for Common Stock to or with limited or general partners, members, stockholders or affiliates (as defined under Rule 12b-2 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) of the undersigned; (D) transfers to immediate family members of the undersigned, trusts for the benefit of the undersigned or immediate family members of the undersigned, or partnerships, limited liability companies or other entities the only partners, members or equity holders of which are the undersigned and/or immediate family members of the undersigned; (E) transfers by will or intestacy upon the death of the undersigned, or by operation of law or pursuant to an order of a court or regulatory authority, such as pursuant to a qualified domestic order, divorce settlement or decree or separation agreement; (F) transfers to, or exchanges with, any investment fund controlled or managed by the undersigned; (G) transfers of shares of Common Stock purchased by the undersigned on the open market following the Public Offering; (H) transfers to conduct a “net” or “cashless” settlement, via a disposition to the Issuer, of any equity awards issued pursuant to an employee benefit plan maintained by the Issuer or any of its subsidiaries, including for the payment of exercise price and tax and remittance payments due, provided that (i) any Common Stock received upon such exercise shall be subject to the restrictions contained herein and (ii) if the undersigned is required to file a report under the Exchange Act reporting a reduction in beneficial ownership of shares of Common Stock during the Restricted Period related to such an exercise by the undersigned, the undersigned shall include a statement in such report to the effect that the filing relates to the satisfaction of net share settlement or tax withholding obligations of the undersigned in connection with such settlement; (I) to the Issuer from an employee of or service provider of the Issuer upon death, disability or termination of employment, in each case, of such employee or service provider and (J) transfers of shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock pursuant to a Change of Control (defined below) of the Issuer approved by the Issuer’s board of directors, provided that in the event that the Change of Control is not completed, the Common Stock owned by the undersigned shall remain subject to the restrictions contained herein; provided that in the case of any transfer or distribution pursuant to clause (B), (C), (D), (E) or (F), each donee, distributee or transferee shall execute and deliver to the Underwriter a lock-up letter in the form of this paragraph; and provided, further, that in the case of any transfer or distribution pursuant to clause (B), (C), (D), (E), (F) or (G), no filing by any party (donor, donee, transferor or transferee) under the Exchange Act showing a reduction in beneficial ownership or other public announcement shall be required or shall be made voluntarily in connection with such transfer or distribution (other than a filing on a Form 5 made after the expiration of the Restricted Period referred to above). The undersigned acknowledges and agrees that the foregoing precludes the undersigned from engaging in any hedging or other transaction designed or intended, or which could reasonably be expected to lead to or result in, a sale or disposition of any shares of Common Stock, or any securities convertible into or exercisable or exchangeable for Common Stock, even if any such sale or disposition transaction or transactions would be made or executed by or on behalf of someone other than the undersigned.
