Investors in Power Solutions International, Inc. have been alerted by several law firms regarding an upcoming securities class action. The lawsuit alleges the company made false and/or misleading statements to investors during the class period from May 8, 2025, to March 2, 2026. The core allegations involve two main points: first, that the company overstated the demand for its power system solutions; and second, that it downplayed the impact, including expected costs and related "inefficiencies," of scaling up manufacturing capacity to meet data center market demand.

The timeline of events and subsequent stock declines is central to the case. The complaint states that the truth began to emerge on November 6, 2025. The company's third-quarter report revealed a gross margin decline of 5.0% year-over-year to 23.9%, partly attributed to "temporary inefficiencies due to accelerated production of key data center product lines." Concurrently, the company forecasted full-year sales growth of 45%, a sharp deceleration compared to the 74% and 65% growth rates seen in the second and third quarters, respectively. Following this news, PSIX's stock price plummeted over 19% in a single day.

A more severe decline occurred on March 2, 2026. The company released its full-year results, disclosing an 8% year-over-year drop in gross margin, again linked to "operational inefficiencies from accelerated production of data center product lines." Its outlook for 2026 projected only "modest margin improvement." This announcement triggered a nearly 29% single-day stock price crash. As of May 2026, multiple law firms have filed securities fraud class action lawsuits on behalf of investors.

A critical deadline is approaching for investors. Under the Private Securities Litigation Reform Act, investors who purchased or acquired PSIX securities during the class period may be eligible to petition the court to be appointed as lead plaintiff by May 19, 2026. The lead plaintiff plays a pivotal role in directing the litigation. Several law firms are urging investors who have suffered significant losses to contact counsel promptly to discuss their legal rights and options.