Core Viewpoint - A class action lawsuit has been filed against Power Solutions International, Inc. for alleged securities fraud and unlawful business practices [2]. Financial Performance - Power Solutions reported a gross margin of 23.9% for Q3 2025, a decrease of 5.0% year-over-year, attributed to temporary inefficiencies from an accelerated production ramp-up for key data center product lines [4]. - The company anticipated a sales growth of 45% for the full year 2025, a significant deceleration from the previous year's growth rates of 74% in Q2 and 65% in Q3 2025 [4]. - In the fourth quarter and full year 2025 results announced on March 2, 2026, gross margin declined by 8% year-over-year due to operating inefficiencies related to the production ramp-up [6]. Stock Performance - Following the Q3 2025 results announcement, Power Solutions' stock price fell by $15.55 per share, or 19.14%, closing at $65.69 on November 7, 2025 [5]. - After the Q4 and full year 2025 results, the stock price dropped by $24.84 per share, or 28.97%, closing at $60.91 on March 3, 2026 [6].