Kiani has just under 4 million Masimo shares, or around 7.5% of the company, according to FactSet data.
Masimo shares are up 15% this year, lifting the company's market cap past $7 billion.
Politan controls 8.9% of Masimo shares.
Kiani, 59, pledged 2.97 million Masimo shares as of April, valued at $397 million, as collateral against "personal loans."
"Rather than sell his pledged shares, Mr. Kiani increased his pledge to maintain his stock ownership."
Persons:
Joe Kiani, Joe Biden, Quentin Koffey's, Kiani, Masimo, Politan
Organizations:
Apple, Capital Management, CNBC