(DCO)

Reporting relationship: Sr. V.P., C.F.O.
Issuer ticker: DCO
Reported as of: 14 May 2026
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 18 May 2026, 20:08:35 UTC
Original report date: 15 May 2026
Prior SEC filing: 12 May 2026
Next SEC filing: 22 May 2026
Source filing: View source filing
Reporting owner signature: Suman B. Mookerji

Key filing fact

Suman B. Mookerji filed Form 4/A - Amendment for DUCOMMUN INC /DE/ (DCO) on 18 May 2026.

Key facts

This page summarizes Suman B. Mookerji's Form 4/A - Amendment filing for DUCOMMUN INC /DE/ (DCO).
5 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 18 May 2026, 20:08.

Change

Previous filing in this sequence was filed on 12 May 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001975924 Primary reporting owner

Mookerji Suman B.

Relationship: Sr. V.P., C.F.O.
Address: 600 ANTON BLVD., SUITE 1100, COSTA MESA
Signature: Suman B. Mookerji
Signature date: 18 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DCO transaction

Common Stock

Tax liability

Transaction value
Shares: -1,239
Change %: -4.6%
Price: $15159.00^*
Shares after: 25,825
Date: 14 May 2026
Ownership: Direct
Footnotes: F1

DCO transaction

Common Stock

Disposed to Issuer

Transaction value
Shares: -1,259
Change %: -4.9%
Price
Shares after: 24,566
Date: 14 May 2026
Ownership: Direct
Footnotes: F2

DCO transaction

Common Stock

Options Exercise

Transaction value
Shares: +7,500
Change %: +31%
Price: $40.44^*
Shares after: 32,066
Date: 15 May 2026
Ownership: Direct

DCO transaction

Common Stock

Tax liability

Transaction value
Shares: -4,783
Change %: -15%
Price: $151.59^*
Shares after: 27,283
Date: 15 May 2026
Ownership: Direct
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

DCO transaction Derivative

Option - Right to Buy

Options Exercise

Transaction value
Shares: +7,500
Change %
Price: $0.000000^*
Shares after: 0
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,500
Exercise price: $40.44
Footnotes: F4, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

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.

Footnote F2

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.

Footnote F3

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.

Footnote F4

This option represents the right to purchase common stock under Ducommun Incorporated's Stock Incentive Plan, which is a Rule 16b-3 plan.

Footnote F5

This option vested as to 2,500 shares on each of October 10, 2020, 2021 and 2022.