Statement of Changes in Beneficial Ownership (Form 4)

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) 03/04/2026 (Street) COSTA MESA, CA 92626 4. If Amendment, Date Original Filed (Month/Day/Year) 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 03/04/2026 A 14,315(1) A $ 0 (2) 56,074 D Common Stock 03/04/2026 F 7,695(3) D $139.45 48,379 D Common Stock 03/04/2026 A 3,361 A $ 0 51,740 D Common Stock 03/05/2026 F 1,361(4) D $130.19 50,379 D Common Stock 03/05/2026 M 4,700 A $42.25 55,079 D Common Stock 03/05/2026 F 3,186 D $139.45 51,893 D Common Stock 03/04/2026 S 14,709 D $134.21(5) 37,184 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 Purchase(6)

$42.25

03/05/2026

M

4,700

06/17/2022(7)

06/17/2029

Common Stock

1,514

$ 0

51,893

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		03/06/2026
**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)	Acquired upon the settlement of performance stock units granted on May 8, 2023 under the Ducommun Incorporated Stock Incentive Plan as a result of the satisfaction of performance metrics underlying the award.
(2)	Granted as compensation for services.
(3)	Represents a reduction in shares to satisfy the tax withholding obligations of the Issuer with respect to the settlement, on March 4, 2026, of 14,315 performance stock units as described in footnote (1) above.
(4)	Represents a reduction of shares to satisfy the tax withholding obligations of the Issuer with respect to the vesting, on March 5, 2026, of 2,532 restricted stock units.
(5)	This transaction was executed in multiple trades at prices ranging from $127.00 to $138.50. The price reported above 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, full information regarding the number of shares and the prices at which the transaction was effectuated.
(6)	This option represents the right to purchase common stock under Ducommun Incorporated's Stock Incentive Plan, which is a Rule 16b-3 plan.
(7)	This option vested in one-third increments on each of June 17, 2020, 2021 and 2022.

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