Sec Form 4 Filing - GUNDERMANN PETER J @ ASTRONICS CORP - 2026-06-15

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 GUNDERMANN PETER J 2. Issuer Name and Ticker or Trading Symbol ASTRONICS CORP [ ATRO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) PRESIDENT/CEO (Last) (First) (Middle) 130 COMMERCE WAY 3. Date of Earliest Transaction (MM/DD/YY) 06/15/2026 (Street) EAST AURORA, NY14052 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 $.01 PV Com Stk 93,967.608 D $.01 PV CL B STK 06/15/2026 J( 1 ) 168,375 A $ 0 916,286 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 Option $ 26.47 12/14/2017 12/14/2026 $.01 PV Com Stk 14,460 14,460 D Option $ 26.47 06/15/2026 J( 1 ) 3,325 12/14/2017 12/14/2026 $.01 PV CL B STK 3,325 $ 0 5,494 D Option $ 29.68 12/12/2018 12/12/2027 $.01 PV Com Stk 26,300 26,300 D Option $ 29.68 06/15/2026 J( 1 ) 6,049 12/12/2018 12/12/2027 $.01 PV CL B STK 6,049 $ 0 9,994 D Option $ 26.31 12/13/2019 12/13/2028 $.01 PV Com Stk 34,790 34,790 D Option $ 26.31 06/15/2026 J( 1 ) 6,958 12/13/2019 12/13/2028 $.01 PV CL B STK 6,958 $ 0 6,958 D Option $ 25.03 12/09/2020 12/09/2029 $.01 PV Com Stk 61,200 61,200 D Option $ 25.03 06/15/2026 J( 1 ) 12,240 12/09/2020 12/09/2029 $.01 PV CL B STK 12,240 $ 0 12,240 D Option $ 12.04 01/22/2022 01/22/2031 $.01 PV Com Stk 98,900 98,900 D Option $ 12.04 06/15/2026 J( 1 ) 19,780 01/22/2022 01/22/2031 $.01 PV CL B STK 19,780 $ 0 19,780 D Option $ 9.28 12/09/2022 12/09/2031 $.01 PV Com Stk 115,800 115,800 D Option $ 9.28 06/15/2026 J( 1 ) 23,160 12/09/2022 12/09/2031 $.01 PV CL B STK 23,160 $ 0 23,160 D Option $ 8.12 12/16/2023 12/16/2032 $.01 PV Com Stk 125,000 125,000 D Option $ 8.12 06/15/2026 J( 1 ) 25,000 12/16/2023 12/16/2032 $.01 PV CL B STK 25,000 $ 0 25,000 D Option $ 12.63 12/07/2024 12/07/2033 $.01 PV Com Stk 83,900 83,900 D Option $ 12.63 06/15/2026 J( 1 ) 16,780 12/07/2024 12/07/2033 $.01 PV CL B STK 16,780 $ 0 16,780 D Restricted Stock Unit ( 2 ) ( 3 ) ( 3 ) $.01 PV Com Stk 26,450 26,450 D Restricted Stock Unit ( 4 ) 06/15/2026 J( 1 ) 5,290 ( 3 ) ( 3 ) $.01 PV CL B STK 5,290 $ 0 5,290 D Option $ 13.79 12/05/2025 12/05/2034 $.01 PV Com Stk 75,800 75,800 D Option $ 13.79 06/15/2026 J( 1 ) 15,160 12/05/2025 12/05/2034 $.01 PV CL B STK 15,160 $ 0 15,160 D Restricted Stock Unit ( 2 ) ( 5 ) ( 5 ) $.01 PV Com Stk 25,250 25,250 D Restricted Stock Unit ( 4 ) 06/15/2026 J( 1 ) 5,050 ( 5 ) ( 5 ) $.01 PV CL B STK 5,050 $ 0 5,050 D Option $ 43.1 12/04/2026 12/04/2035 $.01 PV Com Stk 29,750 29,750 D Option $ 43.1 06/15/2026 J( 1 ) 5,950 12/04/2026 12/04/2035 $.01 PV CL B STK 5,950 $ 0 5,950 D Restricted Stock Unit ( 2 ) ( 6 ) ( 6 ) $.01 PV Com Stk 12,150 12,150 D Restricted Stock Unit ( 4 ) 06/15/2026 J( 1 ) 2,430 ( 6 ) ( 6 ) $.01 PV CL B STK 2,430 $ 0 2,430 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other GUNDERMANN PETER J 130 COMMERCE WAY EAST AURORA, NY14052 X PRESIDENT/CEO Signatures /S/JULIE DAVIS, AS POWER OF ATTORNEY FOR PETER J. GUNDERMANN 06/17/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Shares issued pursuant to a one-for-five distribution of Class B stock to holders of both Common and Class B stock on the record date of June 15, 2026. ( 2 )Each restricted stock unit represents the right to receive, at settlement, one share of common stock. ( 3 )Vesting of these restricted stock units depends on Astronics Corp.'s average annual adjusted EBITDA for the period January 1, 2024- December 31, 2026. The "target" number of restricted stock units is reported. Between 50% and 150% of the target number of units may vest on February 23, 2027, with the vesting percentage determined based on actual performance. ( 4 )Each restricted stock unit represents the right to receive, at settlement, one share of class B stock. ( 5 )Vesting of these restricted stock units depends on Astronics Corp.'s average annual adjusted EBITDA for the period January 1, 2025- December 31, 2027. The "target" number of restricted stock units is reported. Between 50% and 150% of the target number of units may vest on February 27, 2028, with the vesting percentage determined based on actual performance. ( 6 )Vesting of these restricted stock units depends on Astronics Corp.'s average annual adjusted EBITDA for the period January 1, 2026- December 31, 2028. The "target" number of restricted stock units is reported. Between 50% and 150% of the target number of units may vest on February 19, 2029, with the vesting percentage determined based on actual performance.

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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