DUCOMMUN INC /DE/

On August 6, 2025, the Board of Directors approved and adopted an updated and revised Code of Business Conduct and Ethics (the “Code”). This Code applies to all employees, officers, and directors of the Company and its subsidiaries.

The revisions reflect the Company’s commitment to honest and ethical conduct by, among other things, (i) designating a “Purpose” section, which outlines the Company’s unwavering commitment to moral integrity, (ii) updating the provisions related to bribery and corruption and fraudulent activity, (iii) adding detailed descriptions and guidelines to explain conflicts of interests and added a point of contact, (iv) reinforcing that all employees must comply with the Company’s Insider Trading Policy, and (v) describing “whistleblower” programs and other protected communications and adding reference to the Company’s Ethics Hotline number and internal audit department.

Additionally, the updated Code includes various clarifying, stylistic and non-substantive changes. The revisions do not materially alter the responsibilities and obligations outlined in the previous Code, nor do they imply any waiver of its provisions.