Commitments and Contingencies	3 Months Ended
Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Contingencies The legal matters discussed below and others could result in losses, including damages, fines, civil penalties and criminal charges, which could be substantial. The Company records accruals for these contingencies to the extent the Company concludes that a loss is both probable and reasonably estimable. Regarding the matters disclosed below, unless otherwise disclosed, the Company has determined that liabilities associated with these legal matters are reasonably possible; however, unless otherwise stated, the possible loss or range of possible loss cannot be reasonably estimated. Given the nature of the litigation and investigations and the complexities involved, the Company is unable to reasonably estimate a possible loss for all such matters until the Company knows, among other factors the following: •what claims, if any, will survive dispositive motion practice; •the extent of the claims, particularly when damages are not specified or are indeterminate; •how the discovery process will affect the litigation; •the settlement posture of the other parties to the litigation; and •any other factors that may have a material effect on the litigation or investigation. However, the Company could incur judgments, enter into settlements or revise its expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on the Company’s results of operations in the period in which the amounts are accrued and/or liquidity in the period in which the amounts are paid. Mast Powertrain v. the Company In February 2020, the Company received a demand for arbitration from Mast Powertrain, LLC (“Mast”) pursuant to a development agreement entered into in November 2011 (the “Development Agreement”). Mast claimed that it was owed more than $9.0 million in past royalties and other damages for products sold by the Company pursuant to the Development Agreement. The Company disputed Mast’s damages, denied that any royalties are owed to Mast, denied any liability, and counterclaimed for overpayment on invoices paid to Mast. Mast subsequently clarified its claim for past royalties owed to be approximately $4.5 million. In July 2021, the Company reached a settlement with Mast to resolve past claims for royalties owed for $1.5 million which the Company had previously recorded within Selling, general and administrative expenses in the Consolidated Statement of Income for the year-ended December 31, 2020. The Company fully paid the settlement and had no recognized liability as of December 31, 2025. In September 2023, Mast filed a lawsuit against the Company in the Eastern District of Texas Federal Court (“Court”), alleging, among other things, damages of approximately $6.0 million for fraudulent inducement leading to the 2021 arbitration settlement agreement and breach of said settlement agreement. Upon court order, the Company participated in separate mediations in May 2024 and December 2024, and no settlement was reached. The Company has filed a motion to stay the lawsuit and compel it to arbitration, and the Court granted that motion on January 31, 2025. As of both March 31, 2026 and December 31, 2025, the Company had recorded an estimated liability of $0.9 million, recorded within Other accrued liabilities on the Consolidated Balance Sheets related to the potential settlement of this matter. Gary Winemaster Litigation v. The Company In August 2021, the Company’s former Chairman of the Board and former Chief Executive Officer and President, Gary Winemaster (“Winemaster”), filed suit in the Court of Chancery of the State of Delaware against the Company and Travelers Casualty and Surety Company of America (“Travelers”) alleging the Company’s breach of its advancement obligations under Winemaster’s indemnification agreement and Travelers’ breach of the side A policy between Traveler’s and the Company of which Winemaster is a beneficiary. In his complaint, Winemaster was seeking reimbursement under his indemnification agreement in excess of $7.2 million of attorney’s fees plus interest incurred by Winemaster in his defense of the Department of Justice (“DOJ”) case, U.S. v. Winemaster et al. Since the filing of the complaint, the Company estimates that Travelers has paid approximately $8.8 million to Winemaster’s attorneys, Latham and Watkins, under the Company’s side A policy to settle existing outstanding attorney’s fees. Travelers is seeking reimbursement from the Company for those advances pursuant to the terms of the side A policy. In October 2021, the Company and Winemaster entered into a Stipulation and Advancement Order to handle all future attorney’s fees relating to his DOJ and SEC cases, to the extent not reimbursed by Travelers under the side A policy. In June 2024, the Company reached a settlement with Travelers for $4.5 million, resulting in a $4.3 million gain that was recorded within Selling, General and Administrative expenses on the Consolidated Statements of Income. As of both March 31, 2026 and December 31, 2025, the Company recorded the aforementioned settlement liability within Other noncurrent liabilities with the current portion within Other accrued liabilities on the Consolidated Balance Sheets. Refer to Note 8. Other Non-Current Liabilities for additional information related to this settlement. Securities Class Action On March 20, 2026, a putative securities class action complaint captioned Dishion v. Power Solutions International, Inc., et al., Case No. 1:26-cv-03149, was filed in the United States District Court for the Northern District of Illinois against Power Solutions International, Inc. and certain of its executive officers. The complaint purports to assert claims on behalf of persons and entities that purchased or otherwise acquired the Company’s common stock between May 8, 2025 and March 2, 2026, inclusive, and alleges violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder based on alleged misstatements and omissions concerning the Company’s business, operations and prospects, including matters relating to demand, manufacturing capacity and operating inefficiencies for data center product lines. The complaint seeks damages and other relief. The Company believes the claims are without merit and intends to defend the action vigorously. The matter is at an early stage, and the Company cannot reasonably estimate a possible loss or range of loss at this time. Indemnification Agreements The Company has entered into indemnification agreements with each of its directors and executive officers that, subject to the terms and conditions of such agreements and applicable law, provide for indemnification and advancement of expenses to the fullest extent permitted by Delaware law.The Company holds a directors’ and officers’ liability insurance policy, which is renewed annually and currently expires in July 2026. The insurance policy includes standard exclusions including for any previously pending litigation. Other Commitments At March 31, 2026, the Company had four outstanding letters of credit totaling $2.5 million. The letters of credit primarily serve as collateral for the Company for certain facility leases and insurance policies. As discussed in Note 1. Summary of Significant Accounting Policies and Other Information, the Company had restricted cash of $4.4 million as of March 31, 2026, related to these letters of credit and cash held in escrow due to a customer agreement.

The legal matters discussed below and others could result in losses, including damages, fines, civil penalties and criminal charges, which could be substantial. The Company records accruals for these contingencies to the extent the Company concludes that a loss is both probable and reasonably estimable. Regarding the matters disclosed below, unless otherwise disclosed, the Company has determined that liabilities associated with these legal matters are reasonably possible; however, unless otherwise stated, the possible loss or range of possible loss cannot be reasonably estimated. Given the nature of the litigation and investigations and the complexities involved, the Company is unable to reasonably estimate a possible loss for all such matters until the Company knows, among other factors the following:

In February 2020, the Company received a demand for arbitration from Mast Powertrain, LLC (“Mast”) pursuant to a development agreement entered into in November 2011 (the “Development Agreement”). Mast claimed that it was owed more than $9.0 million in past royalties and other damages for products sold by the Company pursuant to the Development Agreement. The Company disputed Mast’s damages, denied that any royalties are owed to Mast, denied any liability, and counterclaimed for overpayment on invoices paid to Mast. Mast subsequently clarified its claim for past royalties owed to be approximately $4.5 million. In July 2021, the Company reached a settlement with Mast to resolve past claims for royalties owed for $1.5 million which the Company had previously recorded within Selling, general and administrative expenses in the Consolidated Statement of Income for the year-ended December 31, 2020. The Company fully paid the settlement and had no recognized liability as of December 31, 2025. In September 2023, Mast filed a lawsuit against the Company in the Eastern District of Texas Federal Court (“Court”), alleging, among other things, damages of approximately $6.0 million for fraudulent inducement leading to the 2021 arbitration settlement agreement and breach of said settlement agreement. Upon court order, the Company participated in separate mediations in May 2024 and December 2024, and no settlement was reached. The Company has filed a motion to stay the lawsuit and compel it to arbitration, and the Court granted that motion on January 31, 2025. As of both March 31, 2026 and December 31, 2025, the Company had recorded an estimated liability of $0.9 million, recorded within Other accrued liabilities on the Consolidated Balance Sheets related to the potential settlement of this matter.

In August 2021, the Company’s former Chairman of the Board and former Chief Executive Officer and President, Gary Winemaster (“Winemaster”), filed suit in the Court of Chancery of the State of Delaware against the Company and Travelers Casualty and Surety Company of America (“Travelers”) alleging the Company’s breach of its advancement obligations under Winemaster’s indemnification agreement and Travelers’ breach of the side A policy between Traveler’s and the Company of which Winemaster is a beneficiary. In his complaint, Winemaster was seeking reimbursement under his indemnification agreement in excess of $7.2 million of attorney’s fees plus interest incurred by Winemaster in his defense of the Department of Justice (“DOJ”) case, U.S. v. Winemaster et al. Since the filing of the complaint, the Company estimates that Travelers has paid approximately $8.8 million to Winemaster’s attorneys, Latham and Watkins, under the Company’s side A policy to settle existing outstanding attorney’s fees. Travelers is seeking reimbursement from the Company for those advances pursuant to the terms of the side A policy. In October 2021, the Company and Winemaster entered into a Stipulation and Advancement Order to handle all future attorney’s fees relating to his DOJ and SEC cases, to the extent not reimbursed by Travelers under the side A policy. In June 2024, the Company reached a settlement with Travelers for $4.5 million, resulting in a $4.3 million gain that was recorded within Selling, General and Administrative expenses on the Consolidated Statements of Income. As of both March 31, 2026 and December 31, 2025, the Company recorded the aforementioned settlement liability within Other noncurrent liabilities with the current portion within Other accrued liabilities on the Consolidated Balance Sheets. Refer to Note 8. Other Non-Current Liabilities for additional information related to this settlement.

On March 20, 2026, a putative securities class action complaint captioned Dishion v. Power Solutions International, Inc., et al., Case No. 1:26-cv-03149, was filed in the United States District Court for the Northern District of Illinois against Power Solutions International, Inc. and certain of its executive officers. The complaint purports to assert claims on behalf of persons and entities that purchased or otherwise acquired the Company’s common stock between May 8, 2025 and March 2, 2026, inclusive, and alleges violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder based on alleged misstatements and omissions concerning the Company’s business, operations and prospects, including matters relating to demand, manufacturing capacity and operating inefficiencies for data center product lines. The complaint seeks damages and other relief. The Company believes the claims are without merit and intends to defend the action vigorously. The matter is at an early stage, and the Company cannot reasonably estimate a possible loss or range of loss at this time.

The Company has entered into indemnification agreements with each of its directors and executive officers that, subject to the terms and conditions of such agreements and applicable law, provide for indemnification and advancement of expenses to the fullest extent permitted by Delaware law.The Company holds a directors’ and officers’ liability insurance policy, which is renewed annually and currently expires in July 2026. The insurance policy includes standard exclusions including for any previously pending litigation.