X0508 4 2026-03-06 0001745916 PennyMac Financial Services, Inc. PFSI 0001275713 SPECTOR DAVID C/O PENNYMAC FINANCIAL SERVICES, INC. 3043 TOWNSGATE ROAD WESTLAKE VILLAGE CA 91361 1 1 Chairman & CEO 1 Common Stock 2026-03-06 4 S 0 729 85.26 D 89875 I ST Family Investment Company LLC Common Stock 2026-03-06 4 S 0 8251 86.42 D 81624 I ST Family Investment Company LLC Common Stock 2026-03-06 4 S 0 1020 86.93 D 80604 I ST Family Investment Company LLC Common Stock 2026-03-06 4 S 0 917 85.26 D 540920 D Common Stock 2026-03-06 4 S 0 10210 86.42 D 530710 D Common Stock 2026-03-06 4 S 0 1309 86.93 D 529401 D The sales reported in the Form 4 occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 8, 2025. The price reported is the weighted average price of multiple transactions ranging from $84.735 to $85.70. The reporting person hereby undertakes to provide upon request to the SEC, the Issuer or a security holder of the Issuer the number of Common Stock and the prices at which the transactions were effected. The price reported is the weighted average price of multiple transactions ranging from $85.78 to $86.775. The reporting person hereby undertakes to provide upon request to the SEC, the Issuer or a security holder of the Issuer the number of Common Stock and the prices at which the transactions were effected. The price reported is the weighted average price of multiple transactions ranging from $86.78 to $87.21. The reporting person hereby undertakes to provide upon request to the SEC, the Issuer or a security holder of the Issuer the number of Common Stock and the prices at which the transactions were effected. The reported amount consists of 37,841 restricted stock units and 491,560 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 W. Stark, attorney-in-fact for Mr. Spector 2026-03-09