---
title: "Apple ordered to pay $184 million more in Masimo patent case, total reaches $818 million"
description: "U.S. District Judge James Selna rejected Apple's windfall argument and applied Masimo's borrowing rate rather than the 7 per cent rate Masimo sought."
url: https://mactoreality.com/apple-ordered-to-pay-184-million-more-in-masimo-patent-case-total-reaches-818-million
published: 2026-10-06T14:43:12Z
updated: 2026-10-06T14:43:12Z
author: "Mac to Reality Newsdesk"
category: Rumours
tags: ["Apple Watch","Business & leadership","Regulation & legal"]
publisher: Mac to Reality
ai_assisted: true
apple_heat_impact: -3
---

# Apple ordered to pay $184 million more in Masimo patent case, total reaches $818 million

*U.S. District Judge James Selna rejected Apple's windfall argument and applied Masimo's borrowing rate rather than the 7 per cent rate Masimo sought.*

**Key points**

- Judge James Selna ordered Apple to pay an extra $184 million in prejudgment interest, raising the Masimo patent case total to about $818 million.
- The court turned down Apple's claim that interest would be a windfall and also denied Masimo's request for a 7 per cent rate, using Masimo's own borrowing cost instead.
- Because the patent expired in June 2022, the award covers only past Apple Watch sales and does not affect current models.

A federal judge has added $184 million in prejudgment interest to the $634 million damages award Masimo won against Apple last year, lifting the total to roughly $818 million.

U.S. District Judge James Selna ruled that interest is required to make the patent holder whole, dismissing Apple’s contention that it would constitute a windfall. He also declined Masimo’s push for a 7 per cent rate — which would have yielded about $243 million — and instead applied Masimo’s actual borrowing rate compounded annually, according to coverage from [MacRumors](https://www.macrumors.com/2026/10/06/apple-watch-patent-bill-just-got-bigger/), [9to5Mac](https://9to5mac.com/2026/10/06/apple-must-pay-masimo-an-extra-184m-for-apple-watch-patent-infringement/), and [AppleInsider](https://appleinsider.com/articles/26/10/06/interest-is-making-apples-payout-to-masimo-much-larger?utm_source=rss). “Interest from the time that the royalty payments would have been received merely serves to make the patent owner whole,” Selna wrote.

The underlying verdict, first reported by [Reuters](https://www.reuters.com/business/us-jury-says-apple-must-pay-masimo-634-million-smartwatch-patent-case-2025-11-15/), came in November 2025 when a jury found Apple infringed a Masimo patent covering low-power pulse oximetry in the Apple Watch. That patent expired in June 2022, so the judgment applies only to historical sales. Apple disabled blood-oxygen readings on U.S. models after an International Trade Commission ban and later rolled out a redesigned version of the feature.

## Sources

- [Reuters: Reuters report](https://www.reuters.com/business/us-jury-says-apple-must-pay-masimo-634-million-smartwatch-patent-case-2025-11-15/)
- [MacRumors: Apple's $634 Million Apple Watch Patent Bill Just Got Even Bigger](https://www.macrumors.com/2026/10/06/apple-watch-patent-bill-just-got-bigger/)
- [9to5Mac: Apple must pay Masimo an extra $184M for Apple Watch patent infringement](https://9to5mac.com/2026/10/06/apple-must-pay-masimo-an-extra-184m-for-apple-watch-patent-infringement/)
- [AppleInsider: Interest is making Apple's payout to Masimo much larger](https://appleinsider.com/articles/26/10/06/interest-is-making-apples-payout-to-masimo-much-larger?utm_source=rss)

*This report was written by the Mac to Reality newsdesk with AI assistance from the sources listed above, under the editorial policy at https://mactoreality.com/editorial-policy.*