Congress Asset Management Trims Stake in Monolithic Power Systems

The investment firm reduced its holdings in the semiconductor company by 16.2% in the fourth quarter.

Mar. 24, 2026 at 8:38am

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Congress Asset Management Co. trimmed its holdings in Monolithic Power Systems, Inc. (NASDAQ:MPWR) by 16.2% during the fourth quarter, according to a recent 13F filing with the Securities and Exchange Commission (SEC). The firm owned 90,686 shares of the semiconductor company's stock after selling 17,585 shares during the quarter.

Why it matters

Monolithic Power Systems is a major player in the semiconductor industry, providing power management solutions for a variety of electronic systems. Changes in institutional ownership of the company's stock can provide insights into market sentiment and potential future performance.

The details

Congress Asset Management Co. sold 17,585 shares of Monolithic Power Systems in the fourth quarter, reducing its total stake to 90,686 shares. The firm now owns about 0.19% of the semiconductor company's outstanding stock. Other institutional investors and hedge funds also made changes to their Monolithic Power Systems positions during the quarter, with some increasing their holdings and others decreasing them.

  • Congress Asset Management Co. filed its 13F report for the fourth quarter on March 24, 2026.

The players

Congress Asset Management Co.

An investment management firm that owns shares in Monolithic Power Systems.

Monolithic Power Systems, Inc.

A fabless semiconductor company that designs and supplies high-performance power management solutions for electronic systems.

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The takeaway

This transaction highlights the ongoing changes in institutional ownership of Monolithic Power Systems, a leading semiconductor company. Investors will likely continue to monitor shifts in major shareholders as they assess the company's long-term prospects.