Amendment to Statement of Changes in Beneficial Ownership (Form 4/A)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Mookerji Suman B. 2. Issuer Name and Ticker or Trading Symbol DUCOMMUN INC /DE/ [DCO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Sr. V.P., C.F.O. (Last) (First) (Middle) 600 ANTON BLVD., SUITE 1100 3. Date of Earliest Transaction (Month/Day/Year) 05/14/2026 (Street) COSTA MESA, CA 92626 4. If Amendment, Date Original Filed (Month/Day/Year) 05/15/2026 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 05/14/2026 05/14/2026 F 1,239(1) D $15,159 25,825 D Common Stock 05/14/2026 05/14/2026 D 1,259(2) D (2) 24,566 D Common Stock 05/15/2026 05/15/2026 M 7,500 A $40.44 32,066 D Common Stock 05/15/2026 05/15/2026 F 4,783(3) D $151.59 27,283 D

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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 - Right to Buy(4)

$40.44

05/15/2026

05/15/2026

M

7,500

10/10/2022(5)

10/10/2029

Common Stock

7,500

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mookerji Suman B. 600 ANTON BLVD. SUITE 1100 COSTA MESA, CA 92626			Sr. V.P., C.F.O.

Signatures

Suman B. Mookerji		05/18/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Represents a reduction in shares to satisfy the tax withholding obligations of the Issuer with respect to the settlement, on May 14, 2026 of 2,498 restricted stock units.
(2)	In connection with the operation of the Issuer's Second Amended and Restated Clawback Policy (the "Clawback Policy") with respect to the restatement and revision of the Issuer's previously issued financialstatements, as reported in the Issuer's Form 8-K filed on May 1, 2026, the Issuer determined that the Reporting Person would not have earned certain compensation had such compensation been determined basedon the restated financial statements. As a result, 2,498 restricted stock units that vested on May 14, 2026 were not delivered to the Reporting Person and 1,259 shares of the Issuer's common stock were returnedto the Issuer in accordance with the Issuer's Clawback Policy.
(3)	The number of shares withheld to satisfy the tax withholding obligations of the Issuer with respect to the exercise of 7,500 stock options on May 15, 2026 was inadvertently identified as 4,728 shares, which has been corrected above.
(4)	This option represents the right to purchase common stock under Ducommun Incorporated's Stock Incentive Plan, which is a Rule 16b-3 plan.
(5)	This option vested as to 2,500 shares on each of October 10, 2020, 2021 and 2022.

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