X0306 4 2022-09-01 0 0001783183 Phathom Pharmaceuticals, Inc. PHAT 0001363812 Henderson Molly C/O PHATHOM PHARMACEUTICALS, INC. 100 CAMPUS DRIVE, SUITE 102 FLORHAM NJ 07932 0 1 0 0 CFO and CBO Common Stock 2022-09-01 4 A 0 7500 0.00 A 45500 D Common Stock 338.86 I By 401(k) Represents restricted stock units ("RSUs") granted on September 1, 2022. Fifty percent (50%) of the total number of RSUs granted vest on each of March 1, 2023 and June 1, 2023, subject to the Reporting Person's continued service on each applicable vesting date. Each RSU represents a contingent right to receive one share of common stock of the Issuer. Includes 338.86 shares acquired under the Phathom Pharmaceuticals, Inc. 401(k) plan. /s/ Larry Miller, Attorney-in-Fact for Molly Henderson 2022-09-02