Masimo Sues Apple for Stealing Trade Secrets for Health Monitoring Functions in Apple Watch

Masimo, a medical technology company that designs pulse oximetry devices, has filed a lawsuit against Apple accusing the Cupertino company of stealing trade secrets and improperly using Masimo inventions related to health monitoring in the Apple Watch.

According to Bloomberg, Masimo claims that Apple stole secret information by pretending to have a working relationship with Masimo, and then hiring Masimo employees. Masimo also believes the Apple Watch is infringing on 10 Masimo patents.

applewatchseries5
Masimo, and its spinoff company Cercacor, claim that Masimo's technology for non-invasive health monitoring helped Apple overcome performance issues with the Apple Watch. Apple allegedly relied on Masimo tech when developing the light-based heart rate sensor used in the Apple Watch, among other technologies.

According to Masimo, Apple first contacted the company in 2013 and asked to meet for a potential collaboration, with Apple asking to "understand more" about Masimo's products to potentially integrate Masimo technology into future Apple devices. After what Masimo considered productive meetings, Apple began hiring away important employees.

Ahead of when the Apple Watch was released, Apple hired Michael O'Reilly, who had served as the Chief Medical Officer and EVP of Medical Affairs at Masimo. He has been working on Health Special Projects at Apple, and had a hand in the development of the Apple Watch.

O'Reilly wasn't the only hire from Masimo, as Apple also took on other former Masimo employees along with employees from other health-related companies during the time the Apple Watch was being designed. Marcelo Lamego, who served as CTO of Cercacor, for example, joined Apple not long after O'Reilly.

Masimo says Apple received confidential information from its hires, and launched a targeted effort to obtain "information and expertise."

Masimo and Cercacor are aiming to block further use of their patented inventions and are asking for unspecified damages. The two companies also want to add their engineers to four patents that were granted to Lamego after leaving the Cercacor.

Popular Stories

iOS 26 Feature

iOS 26.1 to iOS 26.4 Will Add These New Features to Your iPhone

Saturday October 18, 2025 11:00 am PDT by
iOS 26 was released last month, but the software train never stops, and iOS 26.1 beta testing is already underway. So far, iOS 26.1 makes both Apple Intelligence and Live Translation on compatible AirPods available in additional languages, and it includes some other minor changes across the Apple Music, Calendar, Photos, Clock, and Safari apps. More features and changes will follow in future ...
ios 26 1 liquid glass opaque

iOS 26.1 Beta 4 Lets Users Control Liquid Glass Transparency with New Toggle

Monday October 20, 2025 10:57 am PDT by
With the fourth betas of iOS 26.1, iPadOS 26.1, and macOS 26.1, Apple has introduced a new setting that's designed to allow users to customize the look of Liquid Glass. The toggle lets users select from a clear look for Liquid Glass, or a tinted look. Clear is the current Liquid Glass design, which is more transparent and shows the background underneath buttons, bars, and menus, while tinted ...
iphone air thickness

Apple Said to Cut iPhone Air Production Amid Underwhelming Sales

Friday October 17, 2025 8:29 am PDT by
Apple plans to cut production of the iPhone Air amid underwhelming sales performance, Japan's Mizuho Securities believes (via The Elec). The Japanese investment banking and securities firm claims that the iPhone 17 Pro and iPhone 17 Pro Max are seeing higher sales than their predecessors during the same period last year, while the standard iPhone 17 is a major success, performing...
iOS 26

iOS 26.0.2 Update for iPhones Coming Soon

Friday October 17, 2025 7:35 am PDT by
Apple's software engineers continue to internally test iOS 26.0.2, according to MacRumors logs, which have been a reliable indicator of upcoming iOS versions. iOS 26.0.2 will be a minor update that addresses bugs and/or security vulnerabilities, but we do not know any specific details yet. The update will likely be released by the end of next week. Last month, Apple released iOS 26.0.1,...
Apple iPad Pro hero M5

New iPad Pro Has Six Key Upgrades Beyond M5 Chip

Saturday October 18, 2025 10:57 am PDT by
While the new iPad Pro's headline feature is the M5 chip, the device has some other changes, including N1 and C1X chips, faster storage speeds, and more. With the M5 chip, the new iPad Pro has up to a 20% faster CPU and up to a 40% faster GPU compared to the previous model with the M4 chip, according to Geekbench 6 results. Keep in mind that 256GB and 512GB configurations have a 9-core CPU,...
iPhone Siri Glow

Some Apple Employees Have 'Concerns' About iOS 26.4's Revamped Siri

Sunday October 19, 2025 7:39 am PDT by
iOS 26.4 is expected to introduce a revamped version of Siri powered by Apple Intelligence, but not everyone is satisfied with how well it works. In his Power On newsletter today, Bloomberg's Mark Gurman said some of Apple's software engineers have "concerns" about the overhauled Siri's performance. However, he did not provide any specific details about the shortcomings. iOS 26.4 will...
HomePod mini and Apple TV

Apple's Next Rumored Products: New HomePod Mini, Apple TV, and More

Thursday October 16, 2025 9:13 am PDT by
Apple on Wednesday updated the 14-inch MacBook Pro, iPad Pro, and Vision Pro with its next-generation M5 chip, but previous rumors have indicated that the company still plans to announce at least a few additional products before the end of the year. The following Apple products have at one point been rumored to be updated in 2025, although it is unclear if the timeframe for any of them has...
maxresdefault

Here's How the iOS 26.1 Transparency Toggle Changes Liquid Glass

Monday October 20, 2025 1:55 pm PDT by
With the fourth beta of iOS 26.1, Apple added a toggle that makes Liquid Glass more opaque and reduces transparency. We tested the beta to see where the toggle works and what it looks like. Subscribe to the MacRumors YouTube channel for more videos. If you have the latest iOS 26.1 beta, you can go to Settings > Display and Brightness to get to the new option. Tap on Liquid Glass, then...
m4 macbook air blue

M5 MacBook Air Coming Spring 2026 With M5 Mac Studio and Mac Mini in Development

Thursday October 16, 2025 3:57 pm PDT by
Apple plans to launch MacBook Air models equipped with the new M5 chip in spring 2026, according to Bloomberg's Mark Gurman. Apple is also working on M5 Pro and M5 Max MacBook Pro models that will come early in the year. Neither the MacBook Pro models nor the MacBook Air models are expected to get design changes, with Apple focusing on simple chip upgrades. In the case of the MacBook Pro, a m...

Top Rated Comments

swingerofbirch Avatar
76 months ago
Masimo is not at all a fly by night company. They're one of the gold standards if not the gold standard for oximetry in hospital settings, along with various other parameters.

And interestingly, their consumer product, the MightySat, had been an Apple Store exclusive for a while. It's still sold in their online store, possibly the retail stores as well. I assumed they had a good relationship with Apple due to that, also the fact that they have almost non-existent Android support for the MightySat.
Score: 13 Votes (Like | Disagree)
coolfactor Avatar
76 months ago
If Apple did (a) meet with the company, and then (b) hired the employees for their knowledge and skills, then I side with Masimo on this. While I love my Apple Watch, I don't want to see them trample over smaller inventive talent in the marketplace, and especially claim that they came up with the ideas entirely in-house.
Score: 11 Votes (Like | Disagree)
cmaier Avatar
76 months ago

If Apple did (a) meet with the company, and then (b) hired the employees for their knowledge and skills, then I side with Masimo on this. While I love my Apple Watch, I don't want to see them trample over smaller inventive talent in the marketplace, and especially claim that they came up with the ideas entirely in-house.
Hiring someone for their knowledge and skills is the main reason you hire someone.
Hiring someone without knowledge and skills is dumb.
Score: 9 Votes (Like | Disagree)
cmaier Avatar
76 months ago

Did Apple claim that this tech is their innovation? If they did then with this development it feels awkward :)
Why does everyone read a news article citing the PR department at a company which is suing Apple and assume that everything that is said is true?
Score: 8 Votes (Like | Disagree)
Mikey44 Avatar
76 months ago

Many have been in the race to achieve non-invasive glucose readings for a long time. It is the holy grail of non-invasive monitoring and will be a major breakthrough in medical technology when announced. There are some companies closer to achieving this than others and I would strongly doubt Apple would start from scratch considering non-invasive monitoring companies have already begun working towards this achievement. I may be biased because I work at Masimo Corporation, however I wouldn't put it past Apple to try and license the best monitoring technology already in the market rather than start from scratch. I for one would certainly love to see Masimo technology in a wearable Apple device...I think that would be awesome!
Well... This may have occurred, just not the way that LightSpectrum expected or wanted it to.
Score: 7 Votes (Like | Disagree)
mannyvel Avatar
76 months ago
Well, they bring up a couple of issues, but really the only thing that's important is the patent infringement; all the rest of it is sort of BS. Non-competes are invalid in California, so the "hiring away employees" is irrelevant.

And in any case does the information in the employee's head belong to the company or the employee?
Score: 5 Votes (Like | Disagree)