Power Solutions International, Inc. [PSIX] Securities Class Action Lawsuit Update

• Case Name: Dishion v. Power Solutions International, Inc., et al.
• Case No.: 1:26-cv-03149
• Jurisdiction: U.S. District Court, Northern District of Illinois
• Filed on: March 20, 2026
• Class Period: May 8, 2025 – March 2, 2026

Introduction

Power Solutions International, Inc. promoted its pivot toward data-center-related power systems as a driver of growth and profitability, while allegedly understating the operational and margin impact of rapidly expanding manufacturing capacity to meet that demand. According to the newly filed federal complaint, investors claim the company overstated its ability to capitalize on booming data-center demand while understating the operational and margin damage caused by rapidly expanding production capacity.

The case is filed in the Northern District of Illinois, Case No. 1:26-cv-03149, on behalf of investors who purchased PSIX securities between May 8, 2025 and March 2, 2026.

“Most PSIX shareholders never file or join the class action, which means they miss out on potential recovery funds,” said Attorney Joseph Levi.

Backdrop and Business Context

Power Solutions designs and manufactures engines and power systems used in industrial equipment, transportation fleets, and micro-power applications. During the first half of 2025, as transportation demand softened, the company leaned heavily into the data-center market, presenting onsite power generation as a major growth engine amid AI-related infrastructure expansion.

That strategic pivot became the centerpiece of management’s public narrative. The company repeatedly described data-center products as part of a deliberate shift toward higher-growth, higher-margin markets. In SEC filings and earnings materials, executives said manufacturing capacity was being expanded to meet customer demand and that this expansion was already driving revenue growth and profitability.

The complaint states that the company’s data-center expansion and related manufacturing ramp were central to the alleged misstatements and omissions.

Promises Made vs. Reality

Throughout the class period, CEO Dino Xykis and CFO Xun Li allegedly reassured investors that the company’s pivot was both scalable and margin-accretive. In the May 2025 quarter, PSIX described first-quarter performance as its best ever and tied 42% year-over-year sales growth to growing demand in power systems, especially data centers.

By August, the company was still attributing margin pressure only to lower-margin product mix and “temporary inefficiencies related to our accelerated production ramp-up.” That framing persisted through the September 5, 2025 investor presentation, which highlighted “margin expansion opportunities” and the company’s ability to leverage existing infrastructure for future growth.

The alleged reality, according to the complaint, was materially different: the company had overstated its ability to capture demand and understated both the cost and severity of manufacturing inefficiencies required to support the data-center buildout.

Timeline of Alleged Misconduct and Disclosures

The timeline in the complaint unfolds in escalating stages.

The class period opens on May 8, 2025, when PSIX reported strong first-quarter results and linked profitability to the strategic shift into data centers. Similar themes were repeated in the August 7, 2025 second-quarter release and September 5, 2025 investor presentation, where management continued to emphasize demand strength and margin expansion opportunities.

The first crack appeared on November 6, 2025, when third-quarter gross margin fell to 23.9%, down 500 basis points year over year, with the company citing production inefficiencies tied to key data-center product lines. Full-year sales growth guidance also decelerated to 45%, signaling that the ramp was not translating into the expected operating leverage. Shares fell $15.55, or 19.14%, the next day.

The final disclosure came on March 2, 2026, when fourth-quarter margin dropped to 21.9%, an 800 basis-point year-over-year decline. The company disclosed that it was only then beginning to see measurable improvements in supply chain performance and manufacturing costs. On March 3, 2026, PSIX lost $24.84 per share, or 28.97%.

Investor Harm and Market Reaction

According to the complaint, investor losses were tied to the November 6, 2025 and March 2, 2026 disclosures, after which PSIX shares fell 19.14% and 28.97%, respectively. The complaint alleges that, before those disclosures, the market price of PSIX securities was artificially inflated by statements about demand, manufacturing expansion, and profitability tied to the company’s data-center business.

Litigation and Procedural Posture

The lawsuit asserts claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5, naming the company, CEO Dino Xykis, and CFO Xun Li as defendants.

Scienter allegations focus on the executives’ access to internal sales, manufacturing, and financial data while they continued to sign SEC filings and issue public statements emphasizing strong demand, margin expansion, and supposedly temporary inefficiencies. The complaint also invokes the fraud-on-the-market presumption, alleging PSIX traded in an efficient NASDAQ market throughout the class period.

At this stage, these remain allegations only. No court has ruled on the merits.

Shareholder Sentiment

Retail sentiment around PSIX appears to have been broadly bullish during its data-center-driven run, with Reddit discussion framing the company as a growth play tied to AI and data-center buildout. After the later margin-pressure disclosures, retail-facing discussion turned more cautious, with greater focus on execution risk, margin durability, and whether manufacturing issues would weigh on the story going forward.

Analyst Commentary

Before the alleged corrective disclosures, PSIX’s public story centered on strong data-center demand, expanding manufacturing capacity, and continued growth, and the company’s investor-relations page showed active sell-side coverage.

After the November 2025 and March 2026 disclosures, financial commentary shifted toward margin compression, ramp-up inefficiencies, and execution risk, even where the longer-term data-center demand thesis remained intact.

SEC Filings & Risk Factors

The complaint leans heavily on PSIX’s Forms 10-Q for Q1, Q2, and Q3 2025, each of which repeated the same core themes: higher-growth, higher-margin end markets, enhanced manufacturing capacity, and current profitability driven by the pivot toward data centers.

Those same filings also repeatedly described the margin pressure as caused by “temporary inefficiencies,” which investors now allege materially understated the true scale and duration of the cost problem. This SEC-filing contrast is central to the omission theory: the risk was not that ramp-up might pressure margins, but that it allegedly already was doing so more severely than disclosed.

Conclusion: Implications for Investors

For investors, the complaint centers on whether the company’s statements about demand, manufacturing expansion, and profitability in the data-center business adequately reflected the operational costs and inefficiencies later disclosed. At this stage, those remain allegations, and no court has ruled on the merits.

How to Join the Power Solutions International (PSIX) Class Action

• Confirm you purchased PSIX shares between May 8, 2025 and March 2, 2026
• Review the complaint allegations and class-period disclosures
• Click here to check eligibility

Disclaimer: This shareholder alert is for informational purposes only and does not constitute legal advice. Consult a qualified attorney for personalized guidance. No specific outcomes are guaranteed.