Ducommun (NYSE: DCO) CEO reports performance share grants and tax withholding

Rhea-AI Filing Summary

Ducommun Chairman, President and CEO Stephen G. Oswald reported several equity compensation transactions in company common stock. On March 4, 2026, he acquired 75,503 shares upon settlement of performance stock units and 23,649 shares from vesting of performance restricted stock units, both tied to meeting performance criteria on awards granted May 8, 2023. To cover related tax withholding obligations, the issuer reduced his holdings by 40,583 shares and 12,712 shares on March 4, and by 2,409 shares on March 5, 2026. After these transactions, he directly held 419,384 shares of Ducommun common stock, including 279 shares acquired through the employee stock purchase plan.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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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^*

Oswald Stephen G

(Last) (First) (Middle)

600 ANTON BLVD.

SUITE 1100

(Street)

COSTA MESA CA 92626

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
DUCOMMUN INC /DE/ [ DCO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman, President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

4. If Amendment, Date of 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

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		75,503(1)	A	$0(2)	451,439(3)	D
Common Stock	03/04/2026		F		40,583(4)	D	$139.45	410,856	D
Common Stock	03/04/2026		A		23,649(5)	A	$0(2)	434,505	D
Common Stock	03/04/2026		F		12,712(6)	D	$139.45	421,793	D
Common Stock	03/05/2026		F		2,409(7)	D	$130.19	419,384	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 (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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

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. The total amount of securities listed includes 279 shares of common stock acquired on January 30, 2026 through the Ducommun Incorporated Employee Stock Purchase Plan.

4. Represents a reduction in shares to satisfy the tax withholding obligations of the Issuer with respect to the settlement, on March 4, 2026, of 75,503 performance stock units described in footnote (1) above.

5. Represents the vesting of 23,649 performance restricted stock units (n/k/a revenue performance stock units) granted on May 8, 2023 as a result of the satisfaction of performance criteria underlying the award.

6. Represents a reduction in shares to satisfy the tax withholding obligations of the Issuer with respect to the settlement, on March 4, 2026 of 23,640 performance restricted stock units (n/k/a revenue performance stock units) as described in footnote (5) above.

7. Represents a reduction in shares to satisfy the tax withholding obligations of the Issuer with respect to the vesting, on March 5, 2026, of 4,480 restricted stock units.

	Stephen G. Oswald	03/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did Ducommun (DCO) CEO Stephen Oswald report in this Form 4?

Stephen G. Oswald reported equity compensation activity in Ducommun common stock. He received performance-based share awards that vested after meeting performance criteria, and shares were withheld by the issuer to satisfy related tax obligations.

How many Ducommun (DCO) shares did the CEO acquire through awards?

Oswald acquired 75,503 shares from settling performance stock units and 23,649 shares from vesting performance restricted stock units. Both awards were originally granted on May 8, 2023 and became deliverable after the underlying performance metrics were satisfied.

Why were some Ducommun (DCO) shares disposed of in this filing?

The dispositions reflect shares withheld to pay tax withholding obligations. Ducommun reduced Oswald’s share delivery by 40,583 and 12,712 shares on March 4, 2026 and 2,409 shares on March 5, 2026, instead of separate open-market sales.

What is Stephen Oswald’s Ducommun (DCO) share ownership after these transactions?

After the reported transactions, Oswald directly held 419,384 shares of Ducommun common stock. This total includes 279 shares previously acquired through the Ducommun Incorporated Employee Stock Purchase Plan on January 30, 2026.

Were the Ducommun (DCO) stock acquisitions part of compensation?

Yes. The filing notes shares were acquired upon settlement or vesting of performance-based stock units granted on May 8, 2023, and an additional grant is described as compensation for services, reflecting equity incentive compensation rather than open-market purchases.

Did the Ducommun (DCO) CEO make any open-market stock purchases or sales?

The filing describes grant and vesting-related acquisitions and tax-withholding dispositions. Transactions coded as “F” represent shares withheld by the issuer to cover tax obligations, rather than discretionary open-market buys or sells by the CEO.