Commitments and Contingencies	3 Months Ended
Apr. 04, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Guaymas Performance Center Fire Impact to Performance Center. In June 2020, a fire severely damaged our performance center in Guaymas, Mexico, which is part of our Structural Systems segment. There were no injuries, however, property and equipment, inventories, and tooling in this leased facility were damaged. Our Guaymas performance center, comprised of two buildings with an aggregate total of 62,000 square feet, was severely damaged. The insurance claim for damages to our operating assets and business interruption was deemed final and closed by our insurance company during the three months ended July 1, 2023. The loss of production from the Guaymas performance center was absorbed by our other existing performance centers; however, we have reestablished our operations and are in the process of certification with various customers and ramping up our manufacturing capabilities in a different leased facility with 117,000 square feet in Guaymas. Guaymas Fire Litigation. A neighboring, non-related manufacturing facility also suffered fire damage during the same time as the fire that severely damaged our Guaymas performance center, and in November 2023, the occupant of the neighboring facility filed suit against us in U.S. District Court for the Central District of California (the “District Court”) seeking unspecified amounts for damages relating to the fire (“Guaymas Fire Litigation”). Subsequent to our quarter ended September 27, 2025, on October 3, 2025, we entered into a binding settlement term sheet (the “Term Sheet”) to resolve the Guaymas Fire Litigation against us. The Term Sheet provides for, among other things, the final dismissal of the Guaymas Fire Litigation against us with prejudice and a release of claims against us in exchange for us issuing a payment of $150.0 million, $56.0 million of which we expected at that time to be funded by our insurance carriers. The Term Sheet also included a mutual release of all the plaintiff’s past, present, and future claims arising from the fire and an indemnification in favor of us from any future subrogation claims that may be brought by the plaintiff’s insurers. Thereafter, on October 17, 2025, we entered into a settlement agreement that memorialized the terms set forth in and superseded the Term Sheet. We recorded the litigation settlement costs of $150.0 million, which was included as part of the operating loss, and the related accrual which is included as part of accrued and other liabilities during the three months ended September 27, 2025 as such conditions existed as of the end of our fiscal third quarter. In addition, we recorded an insurance receivable of $56.0 million related to the Guaymas Fire Litigation and included as other current assets and on the same line as the litigation settlement costs as the determination that the insurance recovery receivable was probable of collection was based on the terms of the applicable insurance policies, settlement agreement, and communications with our insurance carriers. Our insurance carriers made payments directly to the plaintiff totaling $56.0 million, and on November 24, 2025, we made a payment to the plaintiff of $94.0 million and thus, the $150.0 million settlement liability was extinguished as of December 31,2025. Subrogation Claims. Subsequent to our quarter ended September 27, 2025, on October 9, 2025, we also settled an ancillary subrogation claim for $1.4 million. We recorded the litigation settlement costs of $1.4 million, which was included as part of the operating loss, and the related accrual which was included as part of accrued and other liabilities during the three months ended September 27, 2025 as such conditions existed as of the end of our fiscal third quarter. Thereafter, on October 24, 2025, we entered into a settlement agreement that memorialized the terms agreed to on October 9, 2025. We made the $1.4 million payment to the plaintiff during the three months ended December 31, 2025. Further, in connection with the Guaymas Fire Litigation, in July 2024, we received a subrogation demand (“Additional Subrogation Claim”) from our landlord’s insurer. Subsequent to the fiscal year ended December 31, 2025, on January 7, 2026, we entered into a binding confidential agreement, (“Settlement Agreement”) to resolve the Additional Subrogation Claim against us. The Settlement Agreement provides for, among other things, the final dismissal of the Additional Subrogation Claim and a release of all claims against us, with prejudice, in exchange for us issuing a payment of $4.0 million. We recorded this litigation settlement cost, which was included as part of operating loss, and the related accrual, which was included as part of accrued and other liabilities as of December 31, 2025 as such conditions existed as of our fiscal year ended December 31, 2025. We made a payment of $4.0 million on January 14, 2026. While we do not believe there are any remaining subrogation or other claims relating to the Guaymas fire at this time, other than by an insurer of the plaintiff in the Guaymas Fire Litigation based in Mexico for payments issued to its insured for damages allegedly incurred in the Guaymas fire, and which we believe to be time barred, it is possible that we may face additional subrogation claims associated with the Guaymas Fire Litigation in the future. Our insurance covers damage, up to a capped amount, to the facility, equipment, unfinished inventory, and other assets at replacement cost, finished goods inventory at selling price, as well as business interruption, third party property damage, and recovery related expenses caused by the fire, less our per claim deductible. The anticipated insurance recoveries related to losses and incremental costs incurred are recognized when receipt is probable. The anticipated insurance recoveries in excess of net book value of the damaged operating assets and business interruption are not recorded until all contingencies related to our claim have been resolved. Groundwater Structural Systems has been directed by California environmental agencies to investigate and take corrective action for groundwater contamination at our facilities located in El Mirage and Monrovia, California. Based on currently available information, we have established an accrual for the estimated liability for such investigation and corrective action of $1.5 million at both April 4, 2026 and December 31, 2025, which is reflected in other long-term liabilities on our unaudited condensed consolidated balance sheets. Waste Disposal Structural Systems also faces liability as a potentially responsible party for hazardous waste disposed at landfills located in Casmalia and West Covina, California. Structural Systems and other companies and government entities have entered into consent decrees with respect to these landfills with the United States Environmental Protection Agency and/or California environmental agencies under which certain investigation, remediation and maintenance activities are being performed. Based on currently available information, we preliminarily estimate that the range of our future liabilities in connection with the landfill located in West Covina, California is between $0.4 million and $3.1 million. We have established an accrual for the estimated liability in connection with the West Covina landfill, which had a balance of $0.4 million as of both April 4, 2026 and December 31, 2025, which is reflected in other long-term liabilities on our unaudited condensed consolidated balance sheets. We anticipate an updated estimate will be available over the next 12 to 24 months however, and will update our accrual for the estimated liability at that time, if needed. Our ultimate liability in connection with these matters will depend upon a number of factors, including changes in existing laws and regulations, the design and cost of construction, operation and maintenance activities related to a final remedy, and the allocation of liability among potentially responsible parties. In the normal course of business, Ducommun and its subsidiaries are defendants in certain other litigation, claims and inquiries, including matters relating to environmental laws. In addition, Ducommun makes various commitments and incurs contingent liabilities in the ordinary course of business. While it is not feasible to predict the outcome of these matters, Ducommun does not presently expect that any sum it may be required to pay in connection with these matters would have a material adverse effect on its unaudited condensed consolidated financial position, results of operations or cash flows.

Impact to Performance Center. In June 2020, a fire severely damaged our performance center in Guaymas, Mexico, which is part of our Structural Systems segment. There were no injuries, however, property and equipment, inventories, and tooling in this leased facility were damaged. Our Guaymas performance center, comprised of two buildings with an aggregate total of 62,000 square feet, was severely damaged. The insurance claim for damages to our operating assets and business interruption was deemed final and closed by our insurance company during the three months ended July 1, 2023. The loss of production from the Guaymas performance center was absorbed by our other existing performance centers; however, we have reestablished our operations and are in the process of certification with various customers and ramping up our manufacturing capabilities in a different leased facility with 117,000 square feet in Guaymas.

Guaymas Fire Litigation. A neighboring, non-related manufacturing facility also suffered fire damage during the same time as the fire that severely damaged our Guaymas performance center, and in November 2023, the occupant of the neighboring facility filed suit against us in U.S. District Court for the Central District of California (the “District Court”) seeking unspecified amounts for damages relating to the fire (“Guaymas Fire Litigation”). Subsequent to our quarter ended September 27, 2025, on October 3, 2025, we entered into a binding settlement term sheet (the “Term Sheet”) to resolve the Guaymas Fire Litigation against us. The Term Sheet provides for, among other things, the final dismissal of the Guaymas Fire Litigation against us with prejudice and a release of claims against us in exchange for us issuing a payment of $150.0 million, $56.0 million of which we expected at that time to be funded by our insurance carriers. The Term Sheet also included a mutual release of all the plaintiff’s past, present, and future claims arising from the fire and an indemnification in favor of us from any future subrogation claims that may be brought by the plaintiff’s insurers. Thereafter, on October 17, 2025, we entered into a settlement agreement that memorialized the terms set forth in and superseded the Term Sheet.

We recorded the litigation settlement costs of $150.0 million, which was included as part of the operating loss, and the related accrual which is included as part of accrued and other liabilities during the three months ended September 27, 2025 as such conditions existed as of the end of our fiscal third quarter. In addition, we recorded an insurance receivable of $56.0 million related to the Guaymas Fire Litigation and included as other current assets and on the same line as the litigation settlement costs as the determination that the insurance recovery receivable was probable of collection was based on the terms of the applicable insurance policies, settlement agreement, and communications with our insurance carriers. Our insurance carriers made payments directly to the plaintiff totaling $56.0 million, and on November 24, 2025, we made a payment to the plaintiff of $94.0 million and thus, the $150.0 million settlement liability was extinguished as of December 31,2025.

Subrogation Claims. Subsequent to our quarter ended September 27, 2025, on October 9, 2025, we also settled an ancillary subrogation claim for $1.4 million. We recorded the litigation settlement costs of $1.4 million, which was included as part of the operating loss, and the related accrual which was included as part of accrued and other liabilities during the three months ended September 27, 2025 as such conditions existed as of the end of our fiscal third quarter. Thereafter, on October 24, 2025, we entered into a settlement agreement that memorialized the terms agreed to on October 9, 2025. We made the $1.4 million payment to the plaintiff during the three months ended December 31, 2025. Further, in connection with the Guaymas Fire Litigation, in July 2024, we received a subrogation demand (“Additional Subrogation Claim”) from our landlord’s insurer. Subsequent to the fiscal year ended December 31, 2025, on January 7, 2026, we entered into a binding confidential agreement, (“Settlement Agreement”) to resolve the Additional Subrogation Claim against us. The Settlement Agreement provides for, among other things, the final dismissal of the Additional Subrogation Claim and a release of all claims against us, with prejudice, in exchange for us issuing a payment of $4.0 million. We recorded this litigation settlement cost, which was included as part of operating loss, and the related accrual, which was included as part of accrued and other liabilities as of December 31, 2025 as such conditions existed as of our fiscal year ended December 31, 2025. We made a payment of $4.0 million on January 14, 2026. While we do not believe there are any remaining subrogation or other claims relating to the Guaymas fire at this time, other than by an insurer of the plaintiff in the Guaymas Fire Litigation based in Mexico for payments issued to its insured for damages allegedly incurred in the Guaymas fire, and which we believe to be time barred, it is possible that we may face additional subrogation claims associated with the Guaymas Fire Litigation in the future.

Structural Systems has been directed by California environmental agencies to investigate and take corrective action for groundwater contamination at our facilities located in El Mirage and Monrovia, California. Based on currently available information, we have established an accrual for the estimated liability for such investigation and corrective action of $1.5 million at both April 4, 2026 and December 31, 2025, which is reflected in other long-term liabilities on our unaudited condensed consolidated balance sheets.

Structural Systems also faces liability as a potentially responsible party for hazardous waste disposed at landfills located in Casmalia and West Covina, California. Structural Systems and other companies and government entities have entered into consent decrees with respect to these landfills with the United States Environmental Protection Agency and/or California environmental agencies under which certain investigation, remediation and maintenance activities are being performed. Based on currently available information, we preliminarily estimate that the range of our future liabilities in connection with the landfill located in West Covina, California is between $0.4 million and $3.1 million. We have established an accrual for the estimated liability in connection with the West Covina landfill, which had a balance of $0.4 million as of both April 4, 2026 and December 31, 2025, which is reflected in other long-term liabilities on our unaudited condensed consolidated balance sheets. We anticipate an updated estimate will be available over the next 12 to 24 months however, and will update our accrual for the estimated liability at that time, if needed. Our ultimate liability in connection with these matters will depend upon a number of factors, including changes in existing laws and regulations, the design and cost of construction, operation and maintenance activities related to a final remedy, and the allocation of liability among potentially responsible parties.

In the normal course of business, Ducommun and its subsidiaries are defendants in certain other litigation, claims and inquiries, including matters relating to environmental laws. In addition, Ducommun makes various commitments and incurs contingent liabilities in the ordinary course of business. While it is not feasible to predict the outcome of these matters, Ducommun does not presently expect that any sum it may be required to pay in connection with these matters would have a material adverse effect on its unaudited condensed consolidated financial position, results of operations or cash flows.