Rosen Law Firm Investigates Monolithic Power Systems Directors Over Fiduciary Duties

Rosen Law Firm announced an investigation of potential breaches of fiduciary duties by the directors and officers of Monolithic Power Systems, Inc. (NASDAQ: MPWR), the firm said in a Business Wire announcement published on October 27, 2026. The firm invited current shareholders of the power management chipmaker to visit its website for more information and contact details.

Rosen Law Firm's Monolithic Power Investigation

Rosen Law Firm said it is examining whether Monolithic Power Systems' directors and officers breached their fiduciary duties. The firm directed current shareholders to a case page on its website and provided a toll-free line and email address for Phillip Kim, whom it named as a contact. The announcement did not state a class period, a court, or any monetary figure.

Rosen Law Firm describes itself as a global investor rights firm focused on securities class actions and shareholder derivative litigation. The firm said it was ranked No. 1 by ISS Securities Class Action Services for the number of securities class action settlements in 2017 and has been ranked in the top four each year since 2013. It said it secured over $438 million for investors in 2019 alone, and that founding partner Laurence Rosen was named by law360 as a Titan of Plaintiffs' Bar in 2020. The firm has filed securities class actions against Hyliion Holdings Corp. for alleged false statements and insider trading, against DNOW Inc. over alleged false statements about its merger with MRC Global, and against Alarum Technologies Ltd. for alleged false or misleading statements during a class period from March 20, 2025 to July 2, 2026, according to PR Newswire.

Monolithic Power's Manufacturing And Revenue Scale

Monolithic Power Systems is a fabless semiconductor company that designs power management ICs, modules and isolation products for AI data centers, automotive, industrial, consumer electronics and communications customers, according to akta.pro company records. The same records show the company increased its total manufacturing capacity target from $4 billion to $6 billion units to meet AI infrastructure demand, with the enterprise data segment contributing nearly 80% of overall revenue growth. The records list a market capitalization of $66.5 billion as of July 2026 and record Q1 2026 revenue of $804.2 million, up 26.1% year-over-year, with the enterprise data segment growing 97.7% year-over-year. Monolithic Power Systems was added to the NASDAQ-100 Index in December 2025, the same records show.

Monolithic Power's Recent Results And Deals

Monolithic Power Systems reported record Q2 fiscal 2026 revenue of $981 million, up 48% year-over-year, with earnings per share of $6.50, a 54.4% increase, Yahoo reported in October 2026. The company cited a 45% sequential rise in enterprise data revenue and over 1,500 new automotive products. In September 2026, Simply Wall St reported that Monolithic Power Systems announced a long-term manufacturing deal with GlobalFoundries in Singapore and confirmed a Q3 dividend of $2.00 per share. The company guided Q3 revenue to $1,140 million to $1,160 million, citing strength in AI infrastructure, optical modules and data center design wins, Simply Wall St reported in September 2026.

What Comes Next For Monolithic Power

Rosen Law Firm's announcement did not state a filing deadline or a court date. Monolithic Power Systems has confirmed a Q3 dividend of $2.00 per share, and its Q3 revenue guidance stands at $1,140 million to $1,160 million.