DCO

Ducommun Incorporated

A maker of high-reliability electronic gear and structural components for commercial and military aircraft, Ducommun supplies cable assemblies, printed circuit board assemblies, and lightning diversion systems for planes flown by airlines and armed forces. Its roots reach back to 1849, when Swiss-trained watchmaker Charles Louis Ducommun walked from Arkansas to Los Angeles on foot with a mule, opened a small watch-repair shop, and built a business that became the oldest continuously operating company in California.

CUSIP: 264147109IndustrialsUS3 holders

Ownership Activity Financials Filings

Schedule 13D / 13G filings

STATE STREET CORPORATION

13GPassive

% of class6.3%

Shares945.1K

FiledAug 7, 2026

FMR LLC

13GPassive

% of class5.1%

Shares776.2K

FiledAug 6, 2026

Abigail P. Johnson

13GPassive

% of class5.1%

Shares776.2K

FiledAug 6, 2026

Dimensional Fund Advisors LP

13G/APassive

% of class3.4%

Shares512.2K

FiledApr 9, 2026

The Vanguard Group

13G/APassive

% of class0%

Shares0

FiledMar 26, 2026

GAMCO Asset Management Inc.

13D/AActivist

% of class3.2%

Shares471.6K

FiledMar 10, 2026

The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.

GABELLI FUNDS LLC

13D/AActivist

% of class0.7%

Shares100.7K

FiledMar 10, 2026

Teton Advisors, LLC

13D/AActivist

% of class0.2%

Shares23.7K

FiledMar 10, 2026

GAMCO INVESTORS, INC. ET AL

13D/AActivist

% of class0%

Shares200

FiledMar 10, 2026

GABELLI FOUNDATION, INC.

13D/AActivist

% of class0%

Shares3.8K

FiledMar 10, 2026

Holder	Schedule	% of class	Shares	Filed
STATE STREET CORPORATION	13GPassive	6.3%	945.1K	Aug 7, 2026
FMR LLC	13GPassive	5.1%	776.2K	Aug 6, 2026
Abigail P. Johnson	13GPassive	5.1%	776.2K	Aug 6, 2026
Dimensional Fund Advisors LP	13G/APassive	3.4%	512.2K	Apr 9, 2026
The Vanguard Group	13G/APassive	0%	0	Mar 26, 2026
GAMCO Asset Management Inc.	13D/AActivist	3.2%	471.6K	Mar 10, 2026
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
GABELLI FUNDS LLC	13D/AActivist	0.7%	100.7K	Mar 10, 2026
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
Teton Advisors, LLC	13D/AActivist	0.2%	23.7K	Mar 10, 2026
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
GAMCO INVESTORS, INC. ET AL	13D/AActivist	0%	200	Mar 10, 2026
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.
GABELLI FOUNDATION, INC.	13D/AActivist	0%	3.8K	Mar 10, 2026
The Reporting Persons file the long form Schedule 13D pursuant to Section 13d-1 of the Securities Exchange Act of 1934 (the "Act") even though they may be technically eligible to file the short form Schedule G. Because the Reporting Persons may regularly communicate with the Issuer's management, filing the Schedule 13D ensures that these conversations are compliant with the reporting obligations under the Exchange Act.