Apple ordered to pay $184 million‑plus in interest on $634 million Masimo patent award

A U.S. district court ruled that Apple must add prejudgment interest to the $634 million damages jury awarded Masimo for infringing pulse‑oximetry patents used in the Apple Watch. The judge set the interest at Masimo’s borrowing cost, resulting in an additional $184.2 million and bringing the total payment to about $818.5 million. Apple also faces post‑judgment interest on the outstanding balance. The case follows Masimo’s acquisition by Danaher earlier this year.

The ruling increases Apple’s cash outflow by roughly $184 million and raises the total liability to over $818 million, which could affect its short‑term liquidity (the company disclosed the figure in the court order). Danaher’s recent purchase of Masimo means the larger parent company will benefit from the additional recovery.

  • 1Apple was ordered to pay $634 million in damages to Masimo.
  • 2A U.S. district court ordered Apple to pay $184.2 million in prejudgment interest.
  • 3The total amount Apple must pay rises to $818.5 million.
  • 4The judge set post‑judgment interest at 4 % on the total amount.
  • 5Masimo was acquired by Danaher for $9.9 billion in June 2026.
  • 6Using Masimo’s borrowing cost, the interest calculation amounted to $184,189,784.
  • Post‑judgment interest rate differs between sources: 4 % (material 4) versus 4.02 % (material 5).

Sources