X0508 4 2026-02-28 0001745916 PennyMac Financial Services, Inc. PFSI 0001198631 STARK DEREK C/O PENNYMAC FINANCIAL SERVICES, INC. 3043 TOWNSGATE ROAD WESTLAKE VILLAGE CA 91361 1 Chief Legal Officer 1 Common Stock 2026-02-28 4 F 0 467 91.93 D 22010 D Common Stock 2026-03-03 4 S 0 1066 87.66 D 20944 D Represents shares withheld for taxes upon vesting of restricted stock units. The sale reported on this Form 4 occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 23, 2025. The reported amount consists of 5,944 restricted stock units and 15,000 shares of Common Stock. The restricted stock units are to be settled in an equal number of shares of Common Stock upon vesting. /s/ Derek Stark 2026-03-03