X0508 4 2025-10-06 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 2025-10-06 4 S 0 1355 116.89 D 124249 I ST Family Investment Company LLC Common Stock 2025-10-06 4 S 0 1811 118.19 D 122438 I ST Family Investment Company LLC Common Stock 2025-10-06 4 S 0 711 119.13 D 121727 I ST Family Investment Company LLC Common Stock 2025-10-06 4 S 0 862 119.98 D 120865 I ST Family Investment Company LLC Common Stock 2025-10-06 4 S 0 261 120.89 D 120604 I ST Family Investment Company LLC Common Stock 577859 D The sales reported in the Form 4 occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 2, 2024. The price reported is the weighted average price of multiple transactions ranging from $116.50 to $117.48. 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 $117.60 to $118.585. 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 $118.60 to $119.585. 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 $119.605 to $120.58. 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 $120.70 to $121.19. 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 36,299 restricted stock units and 541,560 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 2025-10-07