A federal judge orders Apple to pay Masimo an additional $184 million in interest on top of an earlier $634 million damages award related to Apple Watch features. The total payout is therefore about $818 million, with further interest potentially accruing until the judgment is paid.
The underlying dispute centers on a Masimo patent covering low-power pulse oximetry features used in Apple Watch. In November 2025, a jury found Apple’s watch functions—reported as including heart-rate notification-related features and workout mode—violated the patent and awarded Masimo $634 million. A federal judge previously upheld that verdict, and later rejected Apple’s attempt to reduce or overturn it.
Across outlets, the main differences focus on how interest is calculated and why it is justified. Judge James Selna rejects Apple’s argument that interest would be a windfall, citing U.S. Supreme Court guidance that interest makes the patent owner whole by compensating for delayed royalty payments. Sources also report that Selna used Masimo’s borrowing rate, compounding annually from the infringement period, and did not apply the higher 7% rate Masimo sought. The patent has since expired, and the rulings relate to historical sales rather than current functionality.
