Bylaw Amendment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549     FORM 8-K     CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 28, 2024     DUCOMMUN INCORPORATED (Exact name of registrant as specified in its charter)       Delaware   001-08174   95-0693330 (State or other jurisdiction of incorporation)   (Commission File Number)   (IRS Employer Identification No.)   600 Anton Blvd. , Suite 1100 Costa Mesa , California   92626 (Address of principal executive offices)   (Zip Code) Registrant’s telephone number, including area code ( 657 ) 335-3665 200 Sandpointe Avenue , Suite 700 , Santa Ana , California 92707-5759 (Former name or former address, if changed since last report.)     Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:     ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)     ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)     ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))     ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:   Title of each class   Trading Symbol(s)   Name of each exchange on which registered Common Stock, $.01 par value per share   DCO   New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company  ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐       Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year. On June 28, 2024, the Board of Directors of Ducommun Incorporated (the “Company”) amended Article I, Section 2 of the Company’s Amended and Restated Bylaws (the “Bylaws”) to change the Company’s principal office for the transaction of business to its Costa Mesa, California corporate headquarters. This description of the amendment to the Company’s Bylaws is qualified in its entirety by reference to the text of the Amendment to Bylaws filed as Exhibit 3.1 to this report.   Item 9.01 Financial Statements and Exhibits. (d) Exhibits   Exhibit No.    Title and Description 3.1    Amendment to the Bylaws of Ducommun Incorporated dated June 28, 2024. 104    Cover Page Interactive Data File (embedded within the Inline XBRL document). 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 undersigned hereunto duly authorized.       DUCOMMUN INCORPORATED (Registrant)  Date: June 28, 2024     By:   /s/ Rajiv A. Tata       Rajiv A. Tata       Vice President, General Counsel & Corporate Secretary