X0609 4 2026-08-17 0001018164 WILLIS LEASE FINANCE CORP WLFC 0001033309 WILLIS CHARLES F IV false 4700 LYONS TECHNOLOGY COCONUT CREEK FL 33073 true true true false Executive Chairman true Common Stock 2026-08-17 4 S false 16032 57.4485 D 2627811 D Common Stock 2026-08-17 4 S false 13590 58.3824 D 2614221 D Common Stock 2026-08-17 4 S false 1778 58.8532 D 2612443 D Common Stock 2026-08-18 4 S false 6485 56.61 D 2605958 D Common Stock 2026-08-18 4 S false 12480 57.4576 D 2593478 D Common Stock 2026-08-18 4 S false 8535 58.1920 D 2584943 D Common Stock 2026-08-19 4 S false 11357 55.1137 D 2573586 D Common Stock 2026-08-19 4 S false 3133 56.4812 D 2570453 D Common Stock 2026-08-19 4 S false 4810 57.2701 D 2565643 D Common Stock 40680 I Spouse Common Stock 6402445 I CFW Partners Common Stock 1752 I Granddaughter These numbers have been adjusted to reflect the 3-for-1 forward stock split, which became effective on July 21, 2026 (the "Stock Split"). The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026. This transaction was executed in multiple trades at prices ranging from $56.80 to $57.75, 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. This transaction was executed in multiple trades at prices ranging from $57.81 to $58.80, 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. This transaction was executed in multiple trades at prices ranging from $58.81 to $58.90, 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 (5) of this Form 4. This transaction was executed in multiple trades at prices ranging from $56.01 to $57.00, 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 (6) of this Form 4. This transaction was executed in multiple trades at prices ranging from $57.015 to $57.99, 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 (7) of this Form 4. This transaction was executed in multiple trades at prices ranging from $58.04 to $58.48, 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 (8) of this Form 4. This transaction was executed in multiple trades at prices ranging from $54.87 to $55.37, 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 (9) of this Form 4. This transaction was executed in multiple trades at prices ranging from $56.00 to $56.99, 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 (10) of this Form 4. This transaction was executed in multiple trades at prices ranging from $57.03 to $57.95, 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 (11) of this Form 4. Charlotte Montressor Willis. Wilder Grace Willis 2016 Trust. /s/ Charles F. Willis IV 2026-08-19