Commitments and Contingencies	6 Months Ended
Jun. 28, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies California’s Wage and Hour Laws Complaint In December 2020, a representative action under California’s Private Attorneys General Act was filed against us in the Superior Court for the State of California, County of San Bernardino. We received service of process of this complaint in January 2021. The complaint alleged violations of California’s wage and hour laws relating to our current and former employees and sought attorney’s fees and penalties. We vigorously refuted and defended these claims, and reached a tentative settlement of $0.8 million during the fourth quarter 2021, which was subject to court approval. Thus, we recorded accrued liabilities of $0.8 million as of December 31, 2021. During the second quarter of 2022, additional factual information was identified resulting in an increase in the amount of the tentative settlement to $0.9 million. Therefore, we recorded an additional accrued liabilities of $0.1 million for a total accrued liabilities amount of $0.9 million as of the end of the second quarter of 2022, which amount remained unchanged as of December 31, 2022 as we were awaiting final court approval of this settlement. Subsequent to final court approval and payment of the $0.9 million in January 2023, during the third quarter of 2023 and upon plaintiff’s motion, the court re-opened the settlement agreement to determine whether the class list captured all affected employees. While we appealed that determination, the appellate court upheld the trial court’s decision, and the case was returned to the trial court for the parties to re-examine the class list. Subsequent to our quarter ended June 28, 2025, and as a result of the re-examination of the class list, additional affected employees were identified and a tentative settlement was reached that will result in an additional net payment of $0.3 million, subject to court approval and which is estimated to be payable in late 2025 or early 2026. Thus, we recorded accrued liabilities of $0.3 million during the second quarter of 2025. 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 June 28, 2025 and December 31, 2024, which is reflected in other long-term liabilities on our 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 June 28, 2025 and December 31, 2024, which is reflected in other long-term liabilities on our 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. 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”). Discovery was completed in July 2025. Subsequent to our quarter ended June 28, 2025, the parties participated in a mediation session held on August 4, 2025. Additionally, a hearing was held on August 5, 2025 in District Court on summary judgment motions and for a determination on the applicability of Mexican law to the case, which is expected to impact the amount of damages the plaintiff may be able to recover from us if we are ultimately held responsible. Rulings on both issues are expected later this year. Subrogation Claims. In connection with the Guaymas Fire Litigation, in July 2024, we received a subrogation demand from our landlord’s insurer, who also serves as one of our excess carriers, and with whom we have since entered into an informed consent and conflict of waiver agreement. Furthermore, during the second quarter of 2025, one of the plaintiff’s insurers intervened in the case asserting a subrogation claim against us for amounts paid to our former neighbor for damages incurred from the fire. It is possible that we may face additional subrogation claims associated with the Guaymas Fire Litigation in the future. While ultimate responsibility for the fire and damages to our former neighbor’s facility are still undetermined, we continue to defend these matters vigorously. As there are numerous legal issues yet to be resolved in connection with these matters, no amount of loss is reasonably estimable at this time. If we are ultimately deemed to be responsible or partly responsible, it is possible we could incur a loss in excess of our insurance coverage limits, which could be material to our cash flow, liquidity, or financial results. 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. 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 condensed consolidated financial position, results of operations or cash flows.

In December 2020, a representative action under California’s Private Attorneys General Act was filed against us in the Superior Court for the State of California, County of San Bernardino. We received service of process of this complaint in January 2021. The complaint alleged violations of California’s wage and hour laws relating to our current and former employees and sought attorney’s fees and penalties. We vigorously refuted and defended these claims, and reached a tentative settlement of $0.8 million during the fourth quarter 2021, which was subject to court approval. Thus, we recorded accrued liabilities of $0.8 million as of December 31, 2021. During the second quarter of 2022, additional factual information was identified resulting in an increase in the amount of the tentative settlement to $0.9 million. Therefore, we recorded an additional accrued

liabilities of $0.1 million for a total accrued liabilities amount of $0.9 million as of the end of the second quarter of 2022, which amount remained unchanged as of December 31, 2022 as we were awaiting final court approval of this settlement. Subsequent to final court approval and payment of the $0.9 million in January 2023, during the third quarter of 2023 and upon plaintiff’s motion, the court re-opened the settlement agreement to determine whether the class list captured all affected employees. While we appealed that determination, the appellate court upheld the trial court’s decision, and the case was returned to the trial court for the parties to re-examine the class list. Subsequent to our quarter ended June 28, 2025, and as a result of the re-examination of the class list, additional affected employees were identified and a tentative settlement was reached that will result in an additional net payment of $0.3 million, subject to court approval and which is estimated to be payable in late 2025 or early 2026. Thus, we recorded accrued liabilities of $0.3 million during the second quarter of 2025.

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 June 28, 2025 and December 31, 2024, which is reflected in other long-term liabilities on our 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 June 28, 2025 and December 31, 2024, which is reflected in other long-term liabilities on our 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.

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”). Discovery was completed in July 2025. Subsequent to our quarter ended June 28, 2025, the parties participated in a mediation session held on August 4, 2025. Additionally, a hearing was held on August 5, 2025 in District Court on summary judgment motions and for a determination on the applicability of Mexican law to the case, which is expected to impact the amount of damages the plaintiff may be able to recover from us if we are ultimately held responsible. Rulings on both issues are expected later this year.

Subrogation Claims. In connection with the Guaymas Fire Litigation, in July 2024, we received a subrogation demand from our landlord’s insurer, who also serves as one of our excess carriers, and with whom we have since entered into an informed consent and conflict of waiver agreement. Furthermore, during the second quarter of 2025, one of the plaintiff’s insurers intervened in the case asserting a subrogation claim against us for amounts paid to our former neighbor for damages incurred from the fire. It is possible that we may face additional subrogation claims associated with the Guaymas Fire Litigation in the future.

While ultimate responsibility for the fire and damages to our former neighbor’s facility are still undetermined, we continue to defend these matters vigorously. As there are numerous legal issues yet to be resolved in connection with these matters, no amount of loss is reasonably estimable at this time. If we are ultimately deemed to be responsible or partly responsible, it is

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.

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 condensed consolidated financial position, results of operations or cash flows.