Masimo CORP Schedule 13G passive stakes

Pentwater Capital Management LP and Matthew Halbower have filed a Schedule 13G reporting a 6.1% beneficial ownership stake in Masimo Corp.

Barclays PLC has filed a Schedule 13G reporting a 5.54% beneficial ownership stake in Masimo Corp as of March 31, 2026.

Joe Kiani, a significant shareholder in Masimo Corporation, has filed an amended Schedule 13G, asserting beneficial ownership of 3,657,039 shares, representing 6.5% of the company's stock, while disputing his termination and the cancellation of certain equity awards.

BlackRock Portfolio Management LLC reports a 0.2% beneficial ownership stake in Masimo Corp as of March 31, 2026.

The Vanguard Group has filed an amended Schedule 13G, reporting 0% beneficial ownership in Masimo Corp following an internal realignment.

FMR LLC and Abigail P. Johnson have filed an amended Schedule 13G, disclosing a 4.5% beneficial ownership stake in Masimo Corp common stock as of February 27, 2026.

Joe Kiani, Masimo Corporation's founder, has filed an amended Schedule 13G, revealing a 10.3% beneficial ownership stake, including millions of shares currently in dispute with the company following his employment termination.

BlackRock Portfolio Management LLC, on behalf of BlackRock entities, has reported an 8.2% beneficial ownership stake in Masimo Corporation as of December 31, 2025.

Joe Kiani, founder of Masimo Corporation, has filed an amended Schedule 13G disclosing an 11.1% beneficial ownership stake, including millions of shares currently in dispute with the company.

Joe Kiani, founder of Masimo Corporation, has disclosed an 11.4% beneficial ownership stake, including over 3.4 million shares currently in dispute with the company following his termination.

Former Masimo CEO Joe Kiani has filed an amended Schedule 13G, disclosing a 13.2% beneficial ownership stake in Masimo Corporation, a significant portion of which is subject to ongoing disputes with the company following his employment termination.

BlackRock Portfolio Management LLC has filed a Schedule 13G, revealing a 10.3% beneficial ownership stake in Masimo Corp's common stock as of February 28, 2025.

FMR LLC and Abigail P. Johnson have filed an amended Schedule 13G, confirming their beneficial ownership of 15.0% of Masimo Corp's common stock as of December 31, 2024.

BlackRock, Inc. has filed an amended Schedule 13G, disclosing an increased beneficial ownership of 7.9% in Masimo Corp's common stock as of January 31, 2025.