X0508 4 2024-05-03 0001745916 PennyMac Financial Services, Inc. PFSI 0001196045 MAZZELLA JOSEPH F C/O PENNYMAC FINANCIAL SERVICES, INC. 3043 TOWNSGATE ROAD WESTLAKE VILLAGE CA 91361 1 0 Common Stock 2024-05-03 4 S 0 16465 90.7335 D 116546 D Common Stock 165031 I Mazzella Family Irrevocable Trust The price reported is the weighted average price of multiple transactions ranging from 90.35 to $91.27. The reporting person hereby undertakes to provide upon request to the SEC, the Issuer or a security holder of the Issuer the number of shares of Common Stock and the prices at which the transactions were effected. The reported amount consists of 1,854 restricted stock units and 114,692 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. Mazzella 2024-05-06