SCHEDULE 13G/A 0001510940 XXXXXXXX LIVE 2 Common Stock 09/30/2025 0000008063 ASTRONICS CORP 046433108 130 COMMERCE WAY - EAST AURORA NY 14052-2164 Rule 13d-1(b) ACK Asset Management LLC b DE 1230000.00 1230000.00 1230000.00 4.0 IA Richard Meisenberg b X1 0.00 1230000.00 1230000.00 1230000.00 4.0 HC John Reilly b X1 0.00 1230000.00 1230000.00 1230000.00 4.0 HC ASTRONICS CORP 130 COMMERCE WAY, -, EAST AURORA, NEW YORK, 14052-2164. This statement is filed by: (i) ACK Asset Management LLC (ACK) with respect to shares of Common Stock, par value $0.01 (Shares), of the Issuer beneficially owned by certain funds and managed accounts advised by ACK and through ACK's managing members, (ii) Richard Meisenberg and (iii) John Reilly. The address of the principal business office of ACK, Richard Meisenberg and John Reilly is 777 West Putnam Ave., Stark Office Suites, Greenwich, CT 06830 ACK is a Delaware limited liability company. Mr. Meisenberg and Mr. Reilly are United States citizens. N IA HC The percentages used herein are calculated based upon the Shares of common stock issued and outstanding as of December 31, 2024 as reported on the Issuer's annual report on Form 10-K filed with the Securities and Exchange Commission by the Issuer for the annual period ended December 31, 2024. As of September 30,2025: 1. ACK Asset Management LLC Amount beneficially owned: 1,230,000 2. Richard Meisenberg Amount beneficially owned: 1,230,000 3. John Reilly Amount beneficially owned: 1,230,000 ACK owns no Shares directly. ACK maintains investment and/or voting power with respect to certain funds and managed accounts advised by it. Mr. Meisenberg and Mr. Reilly are the managing members of ACK and control ACK. By reason of the provisions of Rule 13d-3 of the Securities Exchange Act of 1934, as amended, each of ACK, Mr. Meisenberg and Mr. Reilly may be deemed to beneficially own 1,230,000 Shares (constituting approximately 4.96% of the Shares outstanding). Each of ACK, Mr. Meisenberg and Mr.Reilly disclaims beneficial ownership of any of the securities covered by this statement. 1. ACK Asset Management LLC Percent of class: 3.96% 2. Richard Meisenberg Percent of class: 3.96% 3. John Reilly Percent of class: 3.96% 1. ACK Asset Management LLC Sole power to vote or direct the vote: -0- 2. Richard Meisenberg Sole power to vote or direct the vote: -0- 3. John Reilly Sole power to vote or direct the vote: -0- 1. ACK Asset Management LLC Shared power to vote: 1,230,000 2. Richard Meisenberg Shared power to vote: 1,230,000 3. John Reilly Shared power to vote: 1,230,000 1. ACK Asset Management LLC Sole power to dispose or direct the disposition: -0- 2. Richard Meisenberg Sole power to dispose or direct the disposition: -0- 3. John Reilly Sole power to dispose or direct the disposition: -0- 1. ACK Asset Management LLC Shared power to dispose or direct the disposition: 1,230,000 2. Richard Meisenberg Shared power to dispose or direct the disposition: 1,230,000 3. John Reilly Shared power to dispose or direct the disposition: 1,230,000 Y Y N See Correspondence. N Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. ACK Asset Management LLC Andres Aguirre 11/18/2025 Richard Meisenberg Richard Meisenberg 11/18/2025 John Reilly John Reilly 11/18/2025