Form 8-K

8-K — POWER SOLUTIONS INTERNATIONAL, INC.

Accession: 0001628280-26-054346

Filed: 2026-08-06

Period: 2026-08-06

CIK: 0001137091

SIC: 3510 (ENGINES & TURBINES)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — psix-20260806.htm (Primary)

EX-99.1 (psiearningsrelease-june302.htm)

GRAPHIC (imagea.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: psix-20260806.htm · Sequence: 1

psix-20260806

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

___________________________________

FORM 8-K

___________________________________

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (date of earliest event reported): August 6, 2026

___________________________________

Power Solutions International, Inc.

(Exact name of registrant as specified in its charter)

___________________________________

Delaware

(State or other jurisdiction of

incorporation)

001-35944

(Commission File Number)

33-0963637

(I.R.S. Employer

Identification No.)

201 Mittel Drive Wood Dale, Illinois 60191

(Address of principal executive offices and zip code)

Registrant's telephone number, including area code: (630) 350-9400

___________________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange

on which registered

Common Stock, par value $0.001 per share

PSIX

Nasdaq Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01 - Regulation FD Disclosure

On August 6, 2026, Power Solutions International, Inc. (the “Company”) issued a press release announcing second quarter 2026 financial results and containing its outlook for 2026.

In accordance with General Instruction B.2. of Form 8-K, the information contained under Item 2.02 in this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and will not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01 - Financial Statements and Exhibits.

(d): The following exhibits are being filed herewith:

Exhibit No.

Description

99.1

Press Release of Power Solutions International, Inc., dated August 6, 2026.

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized on this 6th day of August, 2026.

POWER SOLUTIONS INTERNATIONAL, INC.

By:

/s/ Xun Li

Xun Li

Chief Financial Officer & Interim Chief Executive Officer

EX-99.1

Filename: psiearningsrelease-june302.htm · Sequence: 2

Document

Exhibit 99.1

Power Solutions International Announces Second Quarter 2026 Financial Results

Second Quarter Net Sales of $152.5 million

Second Quarter Net Income of $16.9 million

Diluted EPS of $0.73 for the Quarter

Total Debt Reduced by Approximately $30.8 million During the Quarter

WOOD DALE, Ill., August 6, 2026 – Power Solutions International, Inc. (the “Company” or “PSI”) (Nasdaq: PSIX), a leader in the design, engineering and manufacture of emission-certified engines and power systems, today announced its financial results for the second quarter of 2026.

Financial Highlights

Quarter Ended

($ in millions, except per share amounts) June 30, 2026 June 30, 2025 Change

Net Sales $152.5 $191.9 (21)%

Gross Profit $41.4 $54.1 (24)%

Gross Margin % 27.1% 28.2% (1.1)%

Net Income $16.9 $51.2 (67)%

Diluted Earnings per Share $0.73 $2.22 $(1.49)

Kenneth Li, Interim Chief Executive Officer and Chief Financial Officer, said:

“Our second quarter results reflect continued progress as we execute our strategy and invest in the long-term growth of the business. Second quarter sales increased 18.6% from the first quarter, and gross margin improved approximately 420 basis points to 27.1%. The gross margin improvement reflected in part the early benefits of ongoing operational improvement efforts at our Wisconsin facility and was partially offset by unfavorable product mix. Strong operating cash flow also enabled us to reduce total debt by approximately $30.8 million during the quarter, strengthening our balance sheet and financial flexibility.

Compared with a strong prior-year quarter, revenue reflected the timing of certain Power Systems shipments and softer demand in our oil and gas business. Looking ahead, demand for our data center power solutions remains strong. Based on our current production schedule, we expect second-half sales to exceed first-half sales as larger Power Systems orders move into production, although shipment timing and quarterly results may vary.”

Second Quarter 2026 Results

Net sales for the second quarter of 2026 were $152.5 million, a decrease of $39.4 million, or 21%, compared with the second quarter of 2025. The decrease reflected lower sales of $34.6 million, $3.0 million and $1.7 million in the power systems, industrial and transportation end markets, respectively. Sales in the power systems end market declined primarily due to uneven order patterns and shipment timing for data center-related products, together with softness in oil and gas markets. The Company continues to see strong demand for data center power solutions. However, the timing and ultimate volume of revenue recognized from that demand remain subject to customer scheduling, manufacturing throughput, supply chain factors and other variables, and the Company is not predicting any specific level of data center revenue in any future period. Based on the current production schedule, the Company expects second-half 2026 sales to exceed first-half 2026 sales as larger Power Systems orders move into production, although shipment timing and quarterly results may continue to vary.

Gross profit for the second quarter of 2026 was $41.4 million, a decrease of $12.7 million, or 24%, compared with the second quarter of 2025. Gross margin in the second quarter of 2026 was 27.1%, compared with 28.2% in the same period last year. Gross margin reflected a lower mix of oil and gas products, together with elevated production costs associated with capacity ramp-up activities supporting data center-related applications at the Company’s Wisconsin operations. On a sequential basis, gross margin improved by approximately 420 basis points compared with the first quarter of 2026. The improvement reflected in part the early benefits of the Company’s ongoing operational improvement efforts in Wisconsin and was partially offset by unfavorable product mix in the second quarter. The Company’s capacity ramp-up activities at its Wisconsin operations are continuing, and the Company expects related production costs to persist; the trajectory of any further sequential improvement remains subject to product mix, throughput and other operational factors.

Research and development expenses during the three months ended June 30, 2026 and 2025 were $5.1 million and $4.6 million, respectively. The increase was primarily driven by higher R&D program expenditures to support new programs in 2026 and the recovery of R&D costs from certain customers in 2025.

Selling, general and administrative expenses were $12.1 million during the second quarter of 2026, a decrease of $4.6 million, or 27%, compared to the same period in the prior year. The decrease was primarily attributable to lower compensation expense related to the revaluation of previously awarded stock appreciation rights (“SARs”), lower costs associated with employee incentive programs, partially offset by incremental selling and administrative expenses associated with MTL Manufacturing and Equipment.

Interest expense was $1.6 million in the second quarter of 2026, compared to $1.7 million in the same period in the prior year, primarily due to lower overall effective interest rates.

Income tax expense was $5.6 million in the second quarter of 2026, compared to an income tax benefit of $20.1 million in the same period of the prior year. The prior-year period included a $29.2 million, or $1.27 per diluted share, tax benefit resulting from the release of a valuation allowance on deferred tax assets.

Balance Sheet Update

The Company’s cash and cash equivalents were approximately $70.1 million, and total debt was approximately $72.6 million, as of June 30, 2026. Total debt decreased by approximately $30.8 million from March 31, 2026, when total debt was approximately $103.4 million. As of December 31, 2025, cash and cash equivalents were approximately $41.3 million and total debt was approximately $96.6 million. Total debt as of June 30, 2026 included borrowings of $65.0 million under the Company’s Revolving Credit Agreement.

MTL Update

On January 9, 2026, the Company acquired MTL Manufacturing & Equipment, Inc. MTL’s operations contributed positively to the Company’s consolidated net income in the second quarter. The acquisition expanded PSI’s vertical integration by adding in-house manufacturing capabilities for components used in power generation products, including fuel tanks and electrical enclosure panels. The Company believes that these capabilities can enhance supply chain control and manufacturing flexibility and support future growth.

Outlook for 2026

Given ongoing variability in order timing and market conditions, the Company is not providing formal full-year guidance at this time. Based on the current production schedule and information available as of the date of this release, the Company expects second-half 2026 sales to exceed first-half 2026 sales and to

be approximately in line with sales in the second half of 2025, as larger Power Systems orders move into production and are recognized as revenue. However, the timing and ultimate volume of those shipments remain subject to customer scheduling, manufacturing throughput, supply chain factors and other variables. There can be no assurance that those orders will translate to a uniformly stronger second half. Continued softness in the oil and gas end market is expected to weigh on quarterly revenue trends, and capacity ramp-up activities at the Company’s Wisconsin operations and their related cost effects on gross margin are expected to continue.

About Power Solutions International, Inc.

Power Solutions International, Inc. (PSI) is a leader in the design, engineering and manufacture of a broad range of advanced, emission-certified engines and power systems. PSI provides integrated turnkey solutions to leading global original equipment manufacturers and end-user customers within the power systems, industrial and transportation end markets. The Company’s in-house design, prototyping, engineering and testing capabilities allow PSI to customize high-performance engines using a fuel-agnostic strategy to run on a wide variety of fuels, including natural gas, propane, gasoline, diesel and biofuels.

PSI develops and delivers complete power systems that are used worldwide in stationary and mobile power generation applications supporting standby, prime, demand response, and microgrid solutions, as well as products and packages supporting the growing data center markets. PSI’s industrial end market provides engine and battery powertrain solutions to serve applications such as forklifts, agricultural and turf, arbor care, industrial sweepers, aerial lifts, irrigation pumps, ground support, and construction equipment. PSI’s transportation end market provides engine powertrain solutions to specialized applications such as terminal tractors, port equipment, military vehicles, and other non-road vocational vehicles. For more information on PSI, visit www.psiengines.com.

Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements reflect the Company’s current expectations and assumptions regarding future events. Words such as “anticipate,” “believe,” “budget,” “contemplate,” “continue,” “estimate,” “expect,” “forecast,” “guidance,” “intend,” “may,” “outlook,” “plan,” “position,” “project,” “prospect,” “should,” “target,” “will,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain such identifying words. Forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and assumptions that could cause actual results to differ materially from those expressed in or implied by such statements.

Important factors that could cause actual results to differ materially include, without limitation: the timing and ultimate conversion of Power Systems orders into revenue, including data-center-related orders, and the volume and timing of related shipments; quarterly variability in product mix and the corresponding effect on gross profit and gross margin; the cost, pace, throughput and operational outcomes of capacity ramp-up activities at the Company’s Wisconsin operations, including the duration and magnitude of related production costs; the Company’s ability to execute operational improvement initiatives on the anticipated timetable; the level and persistence of customer demand in the power systems, industrial and transportation end markets; volatility in oil and gas prices and corresponding demand for related products; supply-chain disruptions, component availability and supplier performance; macroeconomic, regulatory and trade conditions, including U.S. tariffs and trade restrictions; integration of recent and future acquisitions, including the acquisition of MTL Manufacturing and Equipment; the outcome of pending or threatened litigation and regulatory inquiries, including the previously disclosed putative federal securities class action; changes in management or other personnel, including the timing of any related disclosures; the ability to recruit and retain key employees; the impact of changes in our effective

tax rate or applicable tax legislation; and the other risks and uncertainties described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025 and in the Company’s subsequent filings with the U.S. Securities and Exchange Commission, all of which are incorporated by reference into this press release.

The Company’s forward-looking statements speak only as of the date of this release. Except as required by law, the Company expressly disclaims any intention or obligation to revise or update any forward-looking statement, whether as a result of new information, future events or otherwise. Investors are cautioned not to place undue reliance on any forward-looking statements.

Contact

Power Solutions International, Inc.

Kenneth Li

Chief Financial Officer

630-284-9719

kli@psiengines.com

Results of operations for the three and six months ended June 30, 2026, compared with the three and six months ended June 30, 2025 (UNAUDITED):

(in thousands, except per share amounts) For the Three Months Ended June 30, For the Six Months Ended June 30,

2026 2025 Change % Change 2026 2025 Change % Change

Net sales

(to related parties $10 and $402 for the three months ended June 30, 2026 and 2025, respectively, $19 and $865 for the six months ended June 30, 2026 and 2025, respectively)

$ 152,544 $ 191,907 $ (39,363) (21) % $ 281,136 $ 327,353 $ (46,217) (14) %

Cost of sales

(derived from related party net sales $3 and $271 for the three months ended June 30, 2026 and 2025, respectively, and $8 and $587 for the six months ended June 30, 2026 and 2025, respectively)

111,176 137,824 (26,648) (19) % 210,344 232,976 (22,632) (10) %

Gross profit 41,368 54,083 (12,715) (24) % 70,792 94,377 (23,585) (25) %

Gross margin % 27.1 % 28.2 % (1.1) % 25.2 % 28.8 % (3.6) %

Operating expenses:

Research and development expenses 5,051 4,615 436 9 % 9,856 8,859 997 11 %

Research and development expenses as a % of sales 3.3 % 2.4 % 0.9 % 3.5 % 2.7 % 0.8 %

Selling, general and administrative expenses 12,117 16,680 (4,563) (27) % 25,095 27,789 (2,694) (10) %

Selling, general and administrative expenses as a % of sales 7.9 % 8.7 % (0.8) % 8.9 % 8.5 % 0.4 %

Amortization of intangible assets 280 306 (26) (8) % 529 613 (84) (14) %

Total operating expenses 17,448 21,601 (4,153) (19) % 35,480 37,261 (1,781) (5) %

Operating income 23,920 32,482 (8,562) (26) % 35,312 57,116 (21,804) (38) %

Other expense (income), net:

Interest expense (from related parties of $0 and $219 for the three months ended June 30, 2026 and 2025, respectively, and $0 and $634 for the six months ended June 30, 2026 and 2025, respectively)

1,570 1,700 (130) (8) % 3,315 3,466 (151) (4) %

Other expense (income) (122) (295) 173 NM (208) (295) 87 NM

Total other expense, net 1,448 1,405 43 3 % 3,107 3,171 (64) (2) %

Income before income taxes 22,472 31,077 (8,605) (28) % 32,205 53,945 (21,740) (40) %

Income tax expense (benefit) 5,611 (20,135) 25,746 NM 8,044 (16,349) 24,393 NM

Net income $ 16,861 $ 51,212 $ (34,351) (67) % $ 24,161 $ 70,294 $ (46,133) (66) %

Earnings per common share:

Basic $ 0.73 $ 2.23 $ (1.50) (67) % $ 1.05 $ 3.06 $ (2.01) (66) %

Diluted $ 0.73 $ 2.22 $ (1.49) (67) % $ 1.05 $ 3.05 $ (2.00) (66) %

Non-GAAP Financial Measures:

Adjusted net income * $ 17,971 $ 51,769 $ (33,798) (65) % $ 25,976 $ 71,004 $ (45,028) (63) %

Adjusted net income per share – diluted* $ 0.78 $ 2.24 $ (1.46) (65) % $ 1.13 $ 3.07 $ (1.94) (63) %

EBITDA * $ 25,723 $ 34,108 $ (8,385) (25) % $ 38,893 $ 60,024 $ (21,131) (35) %

Adjusted EBITDA * $ 26,833 $ 34,665 $ (7,832) (23) % $ 40,708 $ 60,734 $ (20,026) (33) %

NM Not meaningful

* See reconciliation of non-GAAP financial measures to GAAP results below

POWER SOLUTIONS INTERNATIONAL, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except par values) As of June 30, 2026 (unaudited) As of December 31, 2025

ASSETS

Current assets:

Cash and cash equivalents $ 70,062 $ 41,250

Restricted cash 4,461 3,698

Accounts receivable, net of allowances of $1,734 and $967 as of June 30, 2026 and December 31, 2025, respectively; (from related parties $200 and $415 as of June 30, 2026 and December 31, 2025, respectively)

80,180 90,446

Income tax receivable 2,879 6,442

Inventories, net 127,582 127,363

Prepaid expenses 3,859 4,500

Contract assets 12,507 15,965

Other current assets 1,004 1,256

Total current assets 302,534 290,920

Property, plant and equipment, net 31,908 23,014

Operating lease right-of-use assets, net 59,267 52,911

Intangible assets, net 1,327 1,236

Goodwill 34,921 29,835

Deferred tax assets 9,517 13,322

Customs-related deposits 13,424 12,893

Other noncurrent assets 419 614

TOTAL ASSETS $ 453,317 $ 424,745

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current liabilities:

Accounts payable (to related parties $8,700 and $4,126 as of June 30, 2026 and December 31, 2025, respectively)

$ 49,508 $ 48,196

Tariff refund liability 22,687 —

Current maturities of long-term debt 935 28

Finance lease liability, current 397 355

Operating lease liability, current 7,561 6,346

Other short-term financing 250 —

Other accrued liabilities (to related parties $53 and $60 as of June 30, 2026 and December 31, 2025, respectively)

36,247 37,353

Total current liabilities 117,585 92,278

Long-term debt, net of current maturities 4,848 10

Revolving line of credit, long-term 65,000 95,000

Finance lease liability, long-term 1,219 1,224

Operating lease liability, long-term 53,676 49,397

Noncurrent contract liabilities 1,649 1,699

Other noncurrent liabilities 6,272 6,528

TOTAL LIABILITIES $ 250,249 $ 246,136

STOCKHOLDERS’ EQUITY

Common stock – $0.001 par value; 50,000 shares authorized; 23,117 shares issued; 23,050 and 23,041 shares outstanding at June 30, 2026 and December 31, 2025, respectively

23 23

Additional paid-in capital 158,308 157,602

Retained earnings 46,637 22,476

Treasury stock, at cost, 67 and 76 shares at June 30, 2026 and December 31, 2025, respectively

(1,900) (1,492)

TOTAL STOCKHOLDERS’ EQUITY 203,068 178,609

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 453,317 $ 424,745

POWER SOLUTIONS INTERNATIONAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

(in thousands) For the Three Months Ended June 30, For the Six Months Ended June 30,

2026 2025 2026 2025

Cash flows from operating activities

Net income $ 16,861 $ 51,212 $ 24,161 $ 70,294

Adjustments to reconcile net income to net cash provided by operating activities:

Amortization of intangible assets 280 306 529 613

Depreciation 1,401 1,025 2,844 2,000

Noncash lease expense 1,897 1,026 3,336 2,974

Stock-based compensation expense 430 154 854 307

Amortization of financing fees 151 166 302 331

Deferred income taxes 2,671 (26,925) 3,805 (26,925)

Provision (credit) for losses in accounts receivable 335 (20) 767 (57)

Increase (decrease) in allowance for inventory obsolescence, net 579 (131) 984 75

Other adjustments, net 48 23 159 56

Changes in operating assets and liabilities, net of effects of business combinations:

Accounts receivable (4,543) (462) 12,594 (13,081)

Inventories 3,653 (30,233) 3,992 (49,527)

Prepaid expenses 434 (3,020) 641 2,177

Contract assets (939) 6,700 3,459 290

Other assets (152) 78 (285) 3,208

Accounts payable 4,267 23,993 (49) 31,007

Tariff refund liability 22,687 — 22,687 —

Income taxes receivable 2,470 — 3,564 986

Accrued expenses and other current liabilities 5,906 (3,307) (4,528) 5,965

Other noncurrent liabilities (1,842) (422) (4,092) (5,219)

Net cash provided by operating activities 56,594 20,163 75,724 25,474

Cash flows from investing activities

Capital expenditures (846) (2,036) (2,736) (5,439)

Proceeds from disposal of assets — 11 — 11

Business acquisitions — — (11,911) —

Net cash used in investing activities (846) (2,025) (14,647) (5,428)

Cash from financing activities

Repayment of long-term debt and lease liabilities (30,758) (121) (30,938) (219)

Repayment of short-term financings — (15,000) — (25,000)

Repurchases to settle tax withholding obligations for stock-based compensation awards — (58) (556) (200)

Other financing activities, net (4) — (8) —

Net cash used in financing activities (30,762) (15,179) (31,502) (25,419)

Net increase (decrease) in cash, cash equivalents, and restricted cash 24,986 (541) 29,575 (5,373)

Cash, cash equivalents, and restricted cash at beginning of the period 49,537 53,659 44,948 58,491

Cash, cash equivalents, and restricted cash at end of the period $ 74,523 $ 53,118 $ 74,523 $ 53,118

Non-GAAP Financial Measures

In addition to the results provided in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) above, this press release also includes non-GAAP (adjusted) financial measures. Non-GAAP financial measures provide insight into selected financial information and should be evaluated in the context in which they are presented. These non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation from, or as a substitute for, financial information presented in compliance with U.S. GAAP, and non-GAAP financial measures as reported by the Company may not be comparable to similarly titled amounts reported by other companies. The non-GAAP financial measures should be considered in conjunction with the consolidated financial statements, including the related notes, and Management’s Discussion and Analysis of Financial Condition and Results of Operations within the Company’s Form 10-Q for the quarter ended June 30, 2026. Management does not use these non-GAAP financial measures for any purpose other than the reasons stated below.

Non-GAAP Financial Measure Comparable GAAP Financial Measure

Adjusted net income Net income

Adjusted net income per share – diluted Net income per share – diluted

EBITDA Net income

Adjusted EBITDA Net income

The Company believes that Adjusted net income, Adjusted net income per share – diluted, EBITDA, and Adjusted EBITDA provide relevant and useful information, which is widely used by analysts, investors and competitors in its industry as well as by the Company’s management in assessing the performance of the Company. Adjusted net income is defined as net income as adjusted for certain items that the Company believes are not indicative of its ongoing operating performance. Adjusted net income per share – diluted is a measure of the Company’s diluted earnings per common share adjusted for the impact of special items. EBITDA provides the Company with an understanding of earnings before the impact of investing and financing charges and income taxes. Adjusted EBITDA further excludes the effects of other non-cash charges and certain other items that do not reflect the ordinary earnings of the Company’s operations.

Adjusted net income, Adjusted net income per share – diluted, EBITDA, and Adjusted EBITDA are used by management for various purposes, including as a measure of performance of the Company’s operations and as a basis for strategic planning and forecasting. Adjusted net income, Adjusted net income per share – diluted, and Adjusted EBITDA may be useful to an investor because these measures are widely used to evaluate companies’ operating performance without regard to items excluded from the calculation of such measures, which can vary substantially from company to company depending on the accounting methods, the book value of assets, the capital structure and the method by which the assets were acquired, among other factors. They are not, however, intended as alternative measures of operating results or cash flow from operations as determined in accordance with U.S. GAAP.

The following table presents a reconciliation from Net income to Adjusted net income for the three and six months ended June 30, 2026 and 2025 (UNAUDITED):

(in thousands) For the Three Months Ended June 30, For the Six Months Ended June 30,

2026 2025 2026 2025

Net income $ 16,861 $ 51,212 $ 24,161 $ 70,294

Stock-based compensation 1

430 154 854 307

Severance and executive recruiting 2

366 403 500 403

Other legal matters 3

314 — 461 —

Adjusted net income $ 17,971 $ 51,769 $ 25,976 $ 71,004

The following table presents a reconciliation from Net income per share – diluted to Adjusted net income per share – diluted for the three and six months ended June 30, 2026 and 2025 (UNAUDITED):

For the Three Months Ended June 30, For the Six Months Ended June 30,

2026 2025 2026 2025

Net income per share – diluted $ 0.73 $ 2.22 $ 1.05 $ 3.05

Stock-based compensation 1

0.02 — 0.04 —

Severance and executive recruiting 2

0.02 0.02 0.02 0.02

Other legal matters 3

0.01 — 0.02 —

Adjusted net income per share – diluted $ 0.78 $ 2.24 $ 1.13 $ 3.07

Diluted shares (in thousands) 23,072 23,067 23,067 23,064

The following table presents a reconciliation from Net income to EBITDA and Adjusted EBITDA for the three and six months ended June 30, 2026 and 2025 (UNAUDITED):

(in thousands) For the Three Months Ended June 30, For the Six Months Ended June 30,

2026 2025 2026 2025

Net income $ 16,861 $ 51,212 $ 24,161 $ 70,294

Interest expense 1,570 1,700 3,315 3,466

Income tax expense (benefit) 5,611 (20,135) 8,044 (16,349)

Depreciation 1,401 1,025 2,844 2,000

Amortization of intangible assets 280 306 529 613

EBITDA 25,723 34,108 38,893 60,024

Stock-based compensation 1

430 154 854 307

Severance and executive recruiting 2

366 403 500 403

Other legal matters 3

314 — 461 —

Adjusted EBITDA $ 26,833 $ 34,665 $ 40,708 $ 60,734

1.Amounts reflect non-cash stock-based compensation expense for the three and six months ended June 30, 2026 and 2025.

2.Amounts include severance expense of less than $0.1 million and $0.1 million for the three and six months ended June 30, 2026 and 2025, respectively, as well as executive recruiting expense of $0.4 million for each period presented.

3.Amounts include legal settlements for the three and six months ended June 30, 2026.

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Cover

Aug. 06, 2026

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Document Type

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Document Period End Date

Aug. 06, 2026

Entity Registrant Name

Power Solutions International, Inc.

Entity Incorporation, State or Country Code

Entity File Number

001-35944

Entity Tax Identification Number

33-0963637

Entity Address, Address Line One

201 Mittel Drive

Entity Address, City or Town

Wood Dale

Entity Address, State or Province

Entity Address, Postal Zip Code

60191

Local Phone Number

350-9400

City Area Code

630

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Area code of city

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Cover page.

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Address Line 1 such as Attn, Building Name, Street Name

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Name of the City or Town

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Code for the postal or zip code

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Name of the state or province.

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

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Indicate if registrant meets the emerging growth company criteria.

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-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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No definition available.

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Two-character EDGAR code representing the state or country of incorporation.

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The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

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-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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-Publisher SEC

-Name Exchange Act

-Number 240

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Local phone number for entity.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

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Title of a 12(b) registered security.

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-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

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Name of the Exchange on which a security is registered.

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-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 240

-Section 14a

-Subsection 12

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Trading symbol of an instrument as listed on an exchange.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

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-Publisher SEC

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-Section 425

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