Power Solutions International, Inc. (PSIX) SEC Filing 10-Q Quarterly report for the period ending Tuesday, March 31, 2020

Exhibit 99.1

Power Solutions International Announces Fourth Quarter and Full Year 2019

Financial Results and the Filing of its Form 10-K

Significant gross margin and profitability improvement for full year of 2019; Full year 2019 net

sales of $546 million and earnings per share of $0.38

WOOD DALE, Ill., May 4, 2020 — Power Solutions International, Inc. (“the Company”) (OTC Pink: PSIX), a leader in the design, engineering and manufacture of emission-certified engines and power systems, announced fourth quarter and full year 2019 financial results and the filing of its Annual Report on Form

Fourth Quarter 2019 Results

Sales for the fourth quarter of 2019 were $153.1 million, an increase of $14.9 million, or 11%, versus the comparable period last year, the result of sales increases of $18.1 million and $13.9 million within the transportation and energy end markets, respectively, partly offset by a sales decrease of $17.2 million within the industrial end market. Higher transportation end market sales were primarily attributable to increased demand for products used in the medium-duty truck market and included approximately $30 million of sales associated with the shipment of certain engines at the request of one of the Company’s customers in the fourth quarter of 2019 that were originally scheduled for the first half of 2020, partly offset by lower demand for products used in the school bus market. Higher sales within the energy end market were attributable to stronger demand for demand response products, partly offset by lower demand for other power generation products, including those used within the oil and gas market. Lower sales in the industrial end market were mostly caused by lower demand for products used in the material handling/forklift market. Gross margin in the fourth quarter of 2019 was 19.4%, a significant improvement of 10.7 percentage points versus the same period last year. Gross profit was $29.7 million, an increase of $17.7 million versus the fourth quarter of 2018 primarily due to higher sales, improved mix, a $3.8 million decline in warranty costs, strategic price increases and operational productivity improvements. Operating expenses decreased by $8.4 million, as compared to the comparable period in 2018, in part attributable to lower selling, general and administrative expenses (SG&A), mostly due to a reduced amount of incremental financial reporting and government investigation expenses given the completion of the restatement of the Company’s financial statements in May 2019, and the absence of asset impairment charges, among other factors. Net income was $8.1 million, or $0.35 per share, versus a net loss of $9.9