Ducommun (DCO) SDConflict minerals disclosure

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM SD

Specialized Disclosure Report

DUCOMMUN INCORPORATED

(Exact name of registrant as specified in its charter)

Christopher D. Wampler – Vice President, Interim Chief Financial Officer and Treasurer, and Controller and

Chief Accounting Officer – (657)335-3665

(Name and telephone number, including area code, of the person to contact in connection with this report)

Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

Section 1 – Conflict Minerals Disclosure

Items 1.01 and 1.02 Conflict Minerals Disclosure and Report; Exhibit

Conflict Minerals Disclosure

Ducommun Incorporated (the “Company”) has filed a Conflict Minerals Report for the year ended December 31, 2019 (the “Report”) as Exhibit 1.01 to this Form SD. The Report is publicly available athttp://phx.corporate-ir.net/phoenix.zhtml?c=70735&p=irol-sec.

Section 2 – Exhibits

Item 2.01 Exhibits

Exhibit 1.01 – Ducommun Incorporated Conflict Minerals Report for the Year Ended December 31, 2019 as required by Items 1.01 and 1.02 of this Form.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.