Ducommun (NYSE: DCO) CFO sells shares and exercises options

Rhea-AI Filing Summary

Ducommun (DCO) senior vice president and CFO Suman B. Mookerji reported a mix of stock transactions and awards. On March 4–5, 2026, he received 14,315 performance stock units upon meeting performance goals and 3,361 additional shares as compensation, while also exercising options for 4,700 shares at $42.25 per share.

To cover tax withholding on these vestings and settlements, 7,695 shares and 3,186 shares were withheld at $139.45 per share and 1,361 shares at $130.19 per share. He also sold 14,709 shares of common stock in open-market transactions at a weighted average price of $134.21 per share. After these transactions, he continued to hold directly over 51,000 shares of Ducommun common stock.

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^*

Mookerji Suman B.

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Sr. V.P., C.F.O.

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		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

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
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

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. 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.

	Suman B. Mookerji	03/06/2026
	** Signature of Reporting Person	Date
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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FAQ

What insider transactions did Ducommun (DCO) CFO Suman B. Mookerji report?

Suman B. Mookerji reported option exercises, stock awards, tax-withholding share dispositions, and an open-market sale. The activity included exercising 4,700 options, receiving performance and compensation shares, and selling 14,709 shares in the open market at a weighted average price of $134.21 per share.

How many Ducommun (DCO) shares did the CFO sell in the open market?

The CFO sold 14,709 shares of Ducommun common stock in an open-market transaction. The sale was executed in multiple trades with a weighted average price of $134.21 per share, based on individual trade prices ranging from $127.00 to $138.50 as described in the footnotes.

What stock awards did Ducommun (DCO) grant to its CFO in this filing?

The CFO acquired 14,315 shares upon settlement of performance stock units granted May 8, 2023, after meeting performance metrics, and received an additional 3,361 shares granted as compensation for services. These awards increased his direct holdings before subsequent tax-related share withholdings and sales.

Why were some Ducommun (DCO) shares disposed of in this Form 4 filing?

Several share dispositions were for tax withholding purposes. Ducommun reduced 7,695 shares and 3,186 shares to satisfy tax obligations on performance stock unit settlements, and 1,361 shares to cover taxes on the vesting of 2,532 restricted stock units, rather than representing discretionary market sales.

What option exercise did the Ducommun (DCO) CFO report?

He exercised an option for 4,700 shares of Ducommun common stock at an exercise price of $42.25 per share. The option was granted under Ducommun’s Stock Incentive Plan, vested in one-third increments on June 17 of 2020, 2021, and 2022, and is a Rule 16b-3 plan award.

How many Ducommun (DCO) shares does the CFO hold after these transactions?

Following the reported transactions and tax-withholding dispositions, the CFO’s direct ownership stood at 51,893 shares of Ducommun common stock. This figure reflects the net result after awards, option exercises, tax-related share reductions, and the open-market sale disclosed in the Form 4.