Pentwater Capital Management LP Acquires 6.1% Stake in Masimo Corp. (MASI)

On May 15, 2026, Pentwater Capital Management LP, along with Matthew Halbower, filed a Schedule 13G with the SEC, reporting a new 6.1% stake in Masimo Corp. (MASI). The reporting persons disclosed beneficial ownership of 3,176,000 shares of common stock as of the event date on March 31, 2026. This position represents a significant increase from their previously reported zero holdings, crossing the 5% beneficial ownership threshold. Pentwater Capital Management LP serves as the investment manager for various funds that directly hold the shares, while Matthew Halbower maintains shared voting and dispositive power over the securities as the sole shareholder of the investment manager's general partner. The filing indicates that the shares were acquired in the ordinary course of business and not for the purpose of influencing or changing the control of the issuer. The ownership percentage was calculated based on 52,362,808 shares outstanding as of the end of March 2026.