Sec Form 4 Filing - Chang William Herbert @ PennyMac Financial Services, Inc. - 2024-02-29

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Chang William Herbert 2. Issuer Name and Ticker or Trading Symbol PennyMac Financial Services, Inc. [ PFSI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Capital Markets Officer (Last) (First) (Middle) C/O PENNYMAC FINANCIAL SERVICES, INC., 3043 TOWNSGATE ROAD 3. Date of Earliest Transaction (MM/DD/YY) 02/29/2024 (Street) WESTLAKE VILLAGE, CA91361 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/29/2024 A 3,164 ( 1 ) A $ 0 39,622 D Common Stock 02/29/2024 M 6,795 ( 2 ) A $ 0 36,458 D Common Stock 02/29/2024 F 2,425 ( 3 ) D $ 83.87 37,197 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Nonstatutory Stock Option (Right to Buy) $ 84.93 02/29/2024 A 7,910 03/01/2025( 4 ) 02/28/2034 Common Stock 7,910 $ 0 7,910 D Performance-Based Restricted Stock Units ( 2 ) 02/29/2024 A 6,795 ( 2 ) ( 2 ) Common Stock 6,795 $ 0 6,795 D Performance-Based Restricted Stock Units ( 2 ) 02/29/2024 M 6,795 ( 2 ) ( 2 ) Common Stock 6,795 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Chang William Herbert C/O PENNYMAC FINANCIAL SERVICES, INC. 3043 TOWNSGATE ROAD WESTLAKE VILLAGE, CA91361 Chief Capital Markets Officer Signatures /s/ Derek W. Stark, attorney-in-fact for Mr. Chang 03/04/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Reporting Person was granted restricted stock units, which will vest in three equal installments beginning on the first anniversary of the date of grant, are to be settled in an equal number of shares of Common Stock upon vesting. ( 2 )This performance-based restricted stock unit (PSU) award was granted to the Reporting Person on February 25, 2021 and vested on February 29, 2024, as determined by the Compensation Committee of the Board of Directors. The payout of shares of Common Stock pursuant to the PSU award was determined base on return of equity and leverage ratio performance for the period of January 1, 2021 through December 31, 2023 resulting in a payout percentage for the award of 114.3%. ( 3 )Represents shares withheld for taxes upon vesting of performance-based restricted stock units. ( 4 )This nonstatutory stock option to purchase 7,910 shares of Common Stock of the Issuer will vest as to one-third of the optioned shares on each of March 1, 2025, 2026 and 2027, subject to the Reporting Person's continued service through each date.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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