X0306 4 2021-08-25 0 0001828522 eFFECTOR Therapeutics, Inc. EFTR 0001828561 Locust Walk Sponsor, LLC C/O LEDGEWOOD PC, TWO COMMERCE SQUARE 2001 MARKET STREET, SUITE 3400 PHILADELPHIA PA 19103 0 0 1 0 Common Stock 2021-08-25 4 C 0 3511250 0.00 A 4056250 D Class B Common Stock 2021-08-25 4 D 0 1000000 0.00 D Common Stock 1000000 3511250 D Class B Common Stock 2021-08-25 4 C 0 3511250 D Common Stock 3511250 0 D On August 25, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of May 26, 2021 (the "Merger Agreement"), by and among the Issuer (f/k/a Locust Walk Acquisition Corp.), Locust Walk Merger Sub, Inc. ("Merger Sub"), and eFFECTOR Therapeutics, Inc. ("Old eFFECTOR"), Merger Sub merged with and into Old eFFECTOR with Old eFFECTOR surviving as a wholly owned subsidiary of the Issuer (the "Merger"). In connection with and upon consummation of the Merger, each of the Issuer's outstanding shares of Class B Common Stock automatically converted into one share of Class A Common Stock and such shares of Class A Common Stock were automatically reclassified in shares of common stock. Pursuant to an agreement by and between the Issuer and the reporting person, concurrent with the consummation of the Merger, these shares of Class B Common Stock were forfeited to the Issuer immediately prior to the Merger. /s/ Chris Ehrlich, Chief Executive Officer 2021-08-27