A federal judge has ordered Apple to pay Masimo an additional $184 million in prejudgment interest on a $634 million patent verdict, according to Bloomberg Law. We did not open the court order itself; the facts below come from Bloomberg Law's report (October 5, 2026) as repeated by MacRumors and 9to5Mac on October 6.
What is reported:
- Judge James V. Selna ruled on Monday, October 5, that Apple owes the interest on the jury's $634 million award to Masimo. The verdict covers Apple Watch features including heart-rate notifications, which a jury found infringed a Masimo pulse-oximetry patent in November 2025.
- Selna rejected Apple's argument that interest would be a windfall for Masimo. He cited US Supreme Court guidance that interest from the time royalties would have been received "merely serves to make the patent owner whole."
- Masimo asked for a 7 percent rate, which MacRumors says would have meant $243 million. The judge denied that and used Masimo's own borrowing rate, compounded annually from when the infringement began.
- MacRumors puts Apple's total at about $818 million, before any post-judgment interest that keeps accruing until the judgment is paid.
Context reported by MacRumors: Selna upheld the verdict in July after Apple tried to overturn or reduce it. The patent expired in June 2022, so the ruling concerns past Apple Watch sales and does not affect heart-rate features in current models. It is separate from the Masimo dispute that led to the US import ban and Apple's redesigned blood oxygen feature.
What we could not confirm: the court order, and whether Apple plans to appeal. None of the outlets we read reported an Apple response.
Sources: Bloomberg Law, "Apple Owes $184 Million in Interest on $634 Million Patent Loss" (October 5, 2026); MacRumors and 9to5Mac, October 6, 2026.