Apple owes Masimo even more than the headline $634 million verdict said.
A federal judge has ordered Apple to pay an extra $184 million in interest on its patent loss to Masimo, pushing the total bill to roughly $818 million. Judge James Selna rejected Apple's claim that prejudgment interest would hand Masimo a windfall, pointing to Supreme Court precedent that such interest simply makes a patent owner whole for royalties it was denied during the infringement period. Masimo didn't get everything it wanted either: the court turned down its request for a 7 percent interest rate, which would have added $243 million, and instead used Masimo's own borrowing rate, compounded annually from when the infringement began. That $818 million figure also excludes post-judgment interest still piling up until Apple actually pays.
This is the unglamorous back half of a fight that already reshaped a real product. The original case triggered a U.S. import ban on certain Apple Watch models and forced Apple to disable blood oxygen monitoring on new units sold in the U.S., a feature it only reintroduced in redesigned form in 2025. The interest ruling doesn't change any of that, but it is a reminder that patent damages keep compounding long after the verdict makes headlines.
Companies love to treat a big jury number as the final cost of losing. Masimo's case shows the meter keeps running until the check clears.