Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on August 6, 2026 in the form attached hereto as Exhibit 99.1.

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on May 12, 2026 in the form attached hereto as Exhibit 99.1.

Non-Reliance on Previously Issued Financial Statements or a Related Audit Report or Completed Interim Review. While preparing the first quarter 2026 consolidated financial statements of Ducommun Incorporated (the “Company” or “Ducommun”), management identified an error in the Company’s historical consolidated financial statements relating to the timing of stock-based compensation expense recognition (the “Error”). In particular, the Company did not apply the proper accounting for changes made…

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on February 26, 2026 in the form attached hereto as Exhibit 99.1.

Regulation FD Disclosure. On January 7, 2026, Ducommun Incorporated (the “Company”) entered into a binding confidential settlement agreement (the “Settlement Agreement”) to resolve a previously disclosed subrogation claim for damages allegedly incurred from a June 2020 fire (the “Fire”) at our performance center in Guaymas, Mexico (the “Performance Center”). The subrogation claim was asserted by the insurer of the entity that provides the labor and facilities for the Performance Center for am…

Creation of a Direct Financial Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant. See

Entry into a Material Definitive Agreement. On November 24, 2025 (the “Closing Date”) Ducommun Incorporated, a Delaware corporation (“Ducommun”) and certain of its subsidiaries entered into a First Amendment to Credit Agreement, Security Agreement and Pledge Agreement with Bank of America, N.A., as administrative agent, swingline lender and an L/C issuer, and the lender parties thereto (the “Amendment”). The Amendment, among other things, made certain amendments to that certain Credit Agreeme…

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on November 6, 2025 in the form attached hereto as Exhibit 99.1.

Entry into a Material Definitive Agreement. On October 3, 2025, Ducommun Incorporated (the “Company”) and certain of its wholly-owned subsidiaries entered into a binding settlement term sheet (the “Term Sheet”) to resolve the previously disclosed action captioned Williams International Co., LLC v. Ducommun Incorporated, et al. (No. 2:23-CV-9403-MEMF-AJR) filed in the U.S. District Court for the Central District of California (the “Litigation”) following a mediation held on that date. For addi…

Regulation FD Disclosure. The Company does not expect the settlement associated with the Litigation to affect the ongoing operations of the Company including its ability to execute on the ramp-up in commercial aerospace production rates, continue to scale its defense business, complete the transition of product lines under its facility consolidation plan and drive cost synergies, and drive its value-based pricing strategy given the one-time nature of the incident and the related settlement am…

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on August 7, 2025 in the form attached hereto as Exhibit 99.1.

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on May 6, 2025 in the form attached hereto as Exhibit 99.1.

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on February 27, 2025 in the form attached hereto as Exhibit 99.1.

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on November 7, 2024 in the form attached hereto as Exhibit 99.1.

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on August 8, 2024 in the form attached hereto as Exhibit 99.1.

Termination of a Material Definitive Agreement (a) On May 9, 2024, Company terminated a key executive severance agreement (each, a “Prior Key Executive Severance Agreement”) with each of the following executive officers: Name Position Date of Agreement Stephen G. Oswald Chairman, President and Chief Executive Officer January 23, 2017 Suman B. Mookerji Senior Vice President, Chief Financial Officer May 2, 2018 Jerry L. Redondo Senior Vice President, Senior Vice President, Electronics and Struc…

Entry into a Material Definitive Agreement (a) On May 9, 2024 Ducommun Incorporated (the “Company”) entered into a key executive severance agreement (each, a “Key Executive Severance Agreement”) with each of the following executive officers (collectively, the “Executives”): Name Position Stephen G. Oswald Chairman, President and Chief Executive Officer Suman B. Mookerji Senior Vice President, Chief Financial Officer Jerry L. Redondo Senior Vice President, Senior Vice President, Electronics an…

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on May 8, 2024 in the form attached hereto as Exhibit 99.1.

Approval of a new stock incentive plan.

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on February 15, 2024 in the form attached hereto as Exhibit 99.1.

Other Events. As previously disclosed on November 18, 2022, Ducommun Incorporated (the “Company”) intended to optimize and consolidate its footprint by closing its Monrovia, California performance center under its 2022 Restructuring Plan and was evaluating options to divest the underlying real estate. Due to the current unfavorable market conditions and other factors, the Company at this time will not divest the real estate underlying its Monrovia, California performance center and will re-ev…

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on November 8, 2023 in the form attached hereto as Exhibit 99.1.

Results of Operations and Financial Condition. Ducommun Incorporated issued a press release on August 3, 2023 in the form attached hereto as Exhibit 99.1.

Vice President, Chief Financial Officer, Controller and Treasurer — Christopher D. Wampler: Mr. Wampler ceased to serve in his executive role but will continue as an advisor with a transition agreement.

Entry Into a Material Definitive Agreement. On May 15, 2023, Ducommun Incorporated (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with Goldman Sachs & Co. LLC, Citigroup Global Markets Inc., RBC Capital Markets, LLC and B. Riley Securities, Inc., as representatives of the underwriters named therein (collectively, the “Underwriters”), pursuant to which the Company agreed to sell 2,000,000 shares of the Company’s common stock, par value $.01 per share, at…