Vanguard Capital Management Discloses New 7.25% Stake in Monolithic Power Systems Inc (MPWR)

On April 30, 2026, Vanguard Capital Management LLC filed a Schedule 13G with the SEC, reporting a new 7.25% stake in Monolithic Power Systems Inc (MPWR). The filing indicates that as of the event date on March 31, 2026, Vanguard beneficially owns 3,561,866 shares of common stock. This position represents a significant increase from a previously reported 0% ownership, marking a new substantial holding for the investment adviser. Vanguard reported sole dispositive power over all 3,561,866 shares, while maintaining sole voting power over 478,417 shares. The filing includes holdings from various affiliates, including Vanguard Asset Management Limited and Vanguard Global Advisers, LLC. The securities were acquired in the ordinary course of business and not for the purpose of influencing or changing the control of the issuer. Monolithic Power Systems, headquartered in Kirkland, Washington, is the issuer of the common stock. The total value of the position is estimated at approximately $5.64 billion based on the filing data.