X0508 4 2026-01-02 0001783183 Phathom Pharmaceuticals, Inc. PHAT 0001820590 Narula Sanjeev C/O PHATHOM PHARMACEUTICALS, INC. 100 CAMPUS DRIVE, SUITE 102 FLORHAM PARK NJ 07932 false true false false Chief Financial & Bus. Officer false Common Stock 2026-01-02 4 A false 82715 0 A 226715 D Stock Option (Right to Buy) 15.71 2026-01-02 4 A false 42848 0 A 2036-01-01 Common Stock 42848 42848 D Represents restricted stock units ("RSUs") granted on January 2, 2026. 1/3 of the total number of RSUs granted vest on each of the first three anniversaries of January 2, 2026, the vesting commencement date (the "Vesting Commencement Date"), subject to the Reporting Person's continued service through each vesting date. Each RSU represents a contingent right to receive one share of common stock of the Issuer. 1/48th of the total number of shares of common stock subject to the option vest monthly following the Vesting Commencement Date, subject to the Reporting Person's continuous service to the Issuer through each vesting date. /s/ Anne Marie Cook, Attorney-in-Fact for Sanjeev Narula 2026-01-02