# EDGAR Filing Document

**Accession Number:** 0001182854
**File Stem:** 0001628280-26-043887
**Filing Date:** 2026-6
**Character Count:** 10541
**Document Hash:** a6dcc451f0d3efd620e394c06f7418b0
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-26-043887.hdr.sgml**: 20260617

**ACCESSION NUMBER**: 0001628280-26-043887

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260615

**FILED AS OF DATE**: 20260617

**DATE AS OF CHANGE**: 20260617

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** GUNDERMANN PETER J
- **CENTRAL INDEX KEY:** 0001182854

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-07087
- **FILM NUMBER:** 261098566

**MAIL ADDRESS:**
- **STREET 1:** 130 COMMERCE WAY
- **CITY:** EAST AURORA
- **STATE:** NY
- **ZIP:** 14052
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ASTRONICS CORP
- **CENTRAL INDEX KEY:** 0000008063
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIRCRAFT PART & AUXILIARY EQUIPMENT, NEC [3728]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 160959303
- **STATE OF INCORPORATION:** NY
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 130 COMMERCE WAY
- **STREET 2:** -
- **CITY:** EAST AURORA
- **STATE:** NY
- **ZIP:** 14052-2164
- **BUSINESS PHONE:** 716-805-1599

**MAIL ADDRESS:**
- **STREET 1:** 130 COMMERCE WAY
- **STREET 2:** -
- **CITY:** EAST AURORA
- **STATE:** NY
- **ZIP:** 14052-2164

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ASTRONICS LUMINESCENT INC
- **DATE OF NAME CHANGE:** 19711209

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>GUNDERMANN PETER J<br><sub>(Last) (First) (Middle)</sub><br>130 COMMERCE WAY<br><sub>(Street)</sub><br>EAST AURORA, NY 14052<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-06-15 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_PRESIDENT/CEO_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>ASTRONICS CORP [ ATRO ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| $.01 PV Com Stk |  |  |  |  |  |  |  | 93967.608 | D |  |
| $.01 PV CL B STK | 2026-06-15 |  | J<sup>(1)</sup> |  | 168375 | A | $0 | 916286 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Option | $26.47 |  |  |  |  |  |  | 2017-12-14 | 2026-12-14 | $.01 PV Com Stk | 14460 |  | 14460 | D |  |
| Option | $26.47 | 2026-06-15 |  | J<sup>(1)</sup> |  | 3325 |  | 2017-12-14 | 2026-12-14 | $.01 PV CL B STK | 3325 | $0 | 5494 | D |  |
| Option | $29.68 |  |  |  |  |  |  | 2018-12-12 | 2027-12-12 | $.01 PV Com Stk | 26300 |  | 26300 | D |  |
| Option | $29.68 | 2026-06-15 |  | J<sup>(1)</sup> |  | 6049 |  | 2018-12-12 | 2027-12-12 | $.01 PV CL B STK | 6049 | $0 | 9994 | D |  |
| Option | $26.31 |  |  |  |  |  |  | 2019-12-13 | 2028-12-13 | $.01 PV Com Stk | 34790 |  | 34790 | D |  |
| Option | $26.31 | 2026-06-15 |  | J<sup>(1)</sup> |  | 6958 |  | 2019-12-13 | 2028-12-13 | $.01 PV CL B STK | 6958 | $0 | 6958 | D |  |
| Option | $25.03 |  |  |  |  |  |  | 2020-12-09 | 2029-12-09 | $.01 PV Com Stk | 61200 |  | 61200 | D |  |
| Option | $25.03 | 2026-06-15 |  | J<sup>(1)</sup> |  | 12240 |  | 2020-12-09 | 2029-12-09 | $.01 PV CL B STK | 12240 | $0 | 12240 | D |  |
| Option | $12.04 |  |  |  |  |  |  | 2022-01-22 | 2031-01-22 | $.01 PV Com Stk | 98900 |  | 98900 | D |  |
| Option | $12.04 | 2026-06-15 |  | J<sup>(1)</sup> |  | 19780 |  | 2022-01-22 | 2031-01-22 | $.01 PV CL B STK | 19780 | $0 | 19780 | D |  |
| Option | $9.28 |  |  |  |  |  |  | 2022-12-09 | 2031-12-09 | $.01 PV Com Stk | 115800 |  | 115800 | D |  |
| Option | $9.28 | 2026-06-15 |  | J<sup>(1)</sup> |  | 23160 |  | 2022-12-09 | 2031-12-09 | $.01 PV CL B STK | 23160 | $0 | 23160 | D |  |
| Option | $8.12 |  |  |  |  |  |  | 2023-12-16 | 2032-12-16 | $.01 PV Com Stk | 125000 |  | 125000 | D |  |
| Option | $8.12 | 2026-06-15 |  | J<sup>(1)</sup> |  | 25000 |  | 2023-12-16 | 2032-12-16 | $.01 PV CL B STK | 25000 | $0 | 25000 | D |  |
| Option | $12.63 |  |  |  |  |  |  | 2024-12-07 | 2033-12-07 | $.01 PV Com Stk | 83900 |  | 83900 | D |  |
| Option | $12.63 | 2026-06-15 |  | J<sup>(1)</sup> |  | 16780 |  | 2024-12-07 | 2033-12-07 | $.01 PV CL B STK | 16780 | $0 | 16780 | D |  |
| Restricted Stock Unit | <sup>(2)</sup> |  |  |  |  |  |  | <sup>(3)</sup> | <sup>(3)</sup> | $.01 PV Com Stk | 26450 |  | 26450 | D |  |
| Restricted Stock Unit | <sup>(4)</sup> | 2026-06-15 |  | J<sup>(1)</sup> |  | 5290 |  | <sup>(3)</sup> | <sup>(3)</sup> | $.01 PV CL B STK | 5290 | $0 | 5290 | D |  |
| Option | $13.79 |  |  |  |  |  |  | 2025-12-05 | 2034-12-05 | $.01 PV Com Stk | 75800 |  | 75800 | D |  |
| Option | $13.79 | 2026-06-15 |  | J<sup>(1)</sup> |  | 15160 |  | 2025-12-05 | 2034-12-05 | $.01 PV CL B STK | 15160 | $0 | 15160 | D |  |
| Restricted Stock Unit | <sup>(2)</sup> |  |  |  |  |  |  | <sup>(5)</sup> | <sup>(5)</sup> | $.01 PV Com Stk | 25250 |  | 25250 | D |  |
| Restricted Stock Unit | <sup>(4)</sup> | 2026-06-15 |  | J<sup>(1)</sup> |  | 5050 |  | <sup>(5)</sup> | <sup>(5)</sup> | $.01 PV CL B STK | 5050 | $0 | 5050 | D |  |
| Option | $43.10 |  |  |  |  |  |  | 2026-12-04 | 2035-12-04 | $.01 PV Com Stk | 29750 |  | 29750 | D |  |
| Option | $43.10 | 2026-06-15 |  | J<sup>(1)</sup> |  | 5950 |  | 2026-12-04 | 2035-12-04 | $.01 PV CL B STK | 5950 | $0 | 5950 | D |  |
| Restricted Stock Unit | <sup>(2)</sup> |  |  |  |  |  |  | <sup>(6)</sup> | <sup>(6)</sup> | $.01 PV Com Stk | 12150 |  | 12150 | D |  |
| Restricted Stock Unit | <sup>(4)</sup> | 2026-06-15 |  | J<sup>(1)</sup> |  | 2430 |  | <sup>(6)</sup> | <sup>(6)</sup> | $.01 PV CL B STK | 2430 | $0 | 2430 | D |  |

---

### Footnotes:

(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.

**Signature:** /S/JULIE DAVIS, AS POWER OF ATTORNEY FOR PETER J. GUNDERMANN  
**Date:** 2026-06-17

### Remarks:

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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**