X0306 4 2022-04-05 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 2022-04-05 4 A 0 20000 0.00 A 20000 D Stock Option (Right to Buy) 15.08 2022-04-05 4 A 0 100000 0.00 A 2032-04-04 Common Stock 100000 100000 D Represents restricted stock units ("RSUs") granted on April 5, 2022. One third (1/3) of the total number of RSUs granted vest on each of the first three anniversaries of April 5, 2022, the vesting commencement date, subject to the Reporting Person's continued service on the applicable vesting date. Each RSU represents a contingent right to receive one share of common stock of the Issuer. The stock option will vest with respect to 25% of the shares of common stock on April 5, 2023, and will vest with respect to the remaining shares in equal monthly installments over the following three years, subject to the reporting person's continuous service to the Company on the applicable vesting dates. /s/ Larry Miller, Attorney-in-Fact for Molly Henderson 2022-04-06