Amendment to Schedule 13D Filing for Ducommun Inc.

This filing is an amendment to a Schedule 13D, reporting changes in beneficial ownership of Ducommun Inc. (DCO) common stock. Several reporting persons, including GAMCO Investors, Inc. et al., Gabelli Funds LLC, and GAMCO Asset Management Inc., have made transactions in the securities within the past sixty days. These transactions include both purchases and sales of shares, with prices ranging from approximately $108.21 to $138.50. As of March 9, 2026, the reporting persons collectively beneficially own 599,956 shares, representing 4.00% of the outstanding common stock. Notably, the reporting persons state they ceased to be the beneficial owner of more than five percent of the Issuer on March 9, 2026. The filing also details the principal business activities and addresses of the various reporting entities, which are primarily investment advisors and related entities managed by Mario Gabelli.