(DCO)

Reporting relationship: Chairman, President & CEO, Director
Issuer ticker: DCO
Reported as of: 17 Aug 2026
Net transaction value: -$509,875
SEC form: 4
Accepted by SEC: 19 Aug 2026, 16:49:25 UTC
Prior SEC filing: 13 Aug 2026
Source filing: View source filing
Reporting owner signature: Stephen G. Oswald

Key filing fact

Stephen G. Oswald filed Form 4 for DUCOMMUN INC /DE/ (DCO) on 19 Aug 2026.

Key facts

This page summarizes Stephen G. Oswald's Form 4 filing for DUCOMMUN INC /DE/ (DCO).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 19 Aug 2026, 16:49.

Change

Previous filing in this sequence was filed on 13 Aug 2026.
Current net transaction value: -$509,875.

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 disclosures.

View source filing

Reporting Owners (1)

CIK 0001695904 Primary reporting owner

Oswald Stephen G

Relationship: Chairman, President & CEO, Director
Address: 600 ANTON BLVD., SUITE 1100, COSTA MESA
Signature: Stephen G. Oswald
Signature date: 19 Aug 2026

Reported non-derivative transactions

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

DCO transaction

Common Stock

Options Exercise

Transaction value
Shares: +10,000
Change %: +2.6%
Price: $32.90^*
Shares after: 392,475
Date: 17 Aug 2026
Ownership: Direct

DCO transaction

Common Stock

Tax liability

Transaction value
Shares: -6,111
Change %: -1.6%
Price: $206.98^*
Shares after: 386,364
Date: 17 Aug 2026
Ownership: Direct

DCO transaction

Common Stock

Sale

Transaction value: $509,875
Shares: -2,500
Change %: -0.65%
Price: $203.95
Shares after: 383,864
Date: 18 Aug 2026
Ownership: Direct
Footnotes: F1

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: -10,000
Change %: -57%
Price: $0.000000^*
Shares after: 7,500
Date: 17 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 10,000
Exercise price: $32.90
Footnotes: F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

This transaction was executed in multiple trades at prices ranging from $202.49 to $204.80. 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 prices at which the transaction was effectuated.

Footnote F2

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

Footnote F3

This option vested in one-third increments on each of May 14, 2019, 2020 and 2021.