Sec Form 4 Filing - Willis Austin Chandler @ WILLIS LEASE FINANCE CORP - 2026-08-03

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 Willis Austin Chandler 2. Issuer Name and Ticker or Trading Symbol WILLIS LEASE FINANCE CORP [ WLFC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) 4700 LYONS TECHNOLOGY PARKWAY 3. Date of Earliest Transaction (MM/DD/YY) 08/03/2026 (Street) COCONUT CREEK, FL33073 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 08/03/2026 S( 2 ) 5,637 D $ 72.7705 ( 3 ) 445,251 ( 1 ) D Common Stock 08/03/2026 S( 2 ) 9,363 D $ 73.6832 ( 4 ) 435,888 D Common Stock 5,466 ( 1 ) I Son ( 5 ) Common Stock 5,466 ( 1 ) I Daughter ( 6 ) Common Stock 66,966 ( 1 ) I Brother ( 7 ) Common Stock 10,347 ( 1 ) I Austin C. Willis 2019 Irrevocable Trust ( 8 ) Common Stock 26,076 ( 1 ) I CFW V 2016 Trust ( 9 ) Common Stock 698,144 ( 1 ) I 2019 Willis Family Trust ( 10 ) ( 11 ) Common Stock 1,216,464 ( 1 ) I CFW Partners ( 12 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Willis Austin Chandler 4700 LYONS TECHNOLOGY PARKWAY COCONUT CREEK, FL33073 X X President and CEO Signatures /s/ Austin C. Willis 08/05/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These numbers have been adjusted to reflect the 3-for-1 forward stock split, which became effective on July 21, 2026 (the "Stock Split"). ( 2 )The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026. ( 3 )This transaction was executed in multiple trades at prices ranging from $72.38 to $73.3697, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4. ( 4 )This transaction was executed in multiple trades at prices ranging from $73.39 to $74.106, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4. ( 5 )Rooster A. Willis 2019 Trust, Austin Willis Trustee. ( 6 )Wilder Grace Willis 2019 Trust, Austin Willis Trustee. ( 7 )Charles F. Willis V 2019 Trust, Austin Willis Trustee. ( 8 )Austin C. Willis 2019 Irrevocable Trust, Mary Willis Trustee. ( 9 )Charles F. Willis V 2016 Trust, Austin Willis Trustee. ( 10 )2019 Willis Family Trust, Austin Willis Trustee. ( 11 )Includes 640,244 shares, as adjusted for the Stock Split, having shared voting power of CFW Partners with Charles F. Willis IV. ( 12 )Shared voting power of CFW Partners with Charles F. Willis IV.

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).

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