Kirkland & Ellis, Cleary Gottlieb, White & Case, Sullivan & Cromwell, and Knobbe Martens advised on Danaher’s $9.9 billion acquisition of Masimo.

Masimo will be a standalone operating company within Danaher’s Diagnostics segment along with Radiometer, Leica Biosystems, Cepheid and Beckman Coulter Diagnostics. The transaction is anticipated to close in the second half of 2026 and is subject to customary conditions, including receipt of applicable regulatory clearances and Masimo shareholder approval.

Kirkland & Ellis advised Danaher on the transaction.

The team included corporate lawyers David Klein, Brian Junquera and Daniel Wolf; technology & IP transactions lawyers Adam Petravicius and Joanna Schlingbaum; litigation lawyer Jordan Peterson; intellectual property lawyer Ellison Turner; executive compensation lawyers Scott Price, David Branham and Madison Riddick; debt finance lawyer Rachael Lichman; capital markets lawyers Josh Korff and Diahndra Burman; and tax partners Dean Shulman and Liam Murphy.

Cleary Gottlieb is representing Danaher as global antitrust and competition counsel on the acquisition.

The antitrust team includes partners Bruce Hoffman and Blair Matthews and associates Tobi Kraft and Kelton Anderson (Washington, D.C.); associates Kasey Clarke and Lara Ellenberg (New York); associates Sean Sharaf and Justin Lin (Bay Area); and partners Nick Levy and Romi Lepetska and associates Augustin Bourleaud, Jaime Castillo Botero and Renata Stefan (Brussels and London).

White & Case advised Masimo on its entry into the definitive agreement with Danaher.

The team was led by M&A partner Richard Brand and included Employment, Compensation & Benefits partner Sasha Belinkie and associate Kasey Lee; Debt Finance partners Yehuda Rubel and Justin Wagstaff; M&A partners Matthew Barnett and Erica Hogan and associate Nicholas Luciano; and Capital Markets associate Melissa Curvino. International law clerk Anurag Chadha also advised on the matter.

Sullivan & Cromwell (S&C) is also advising Masimo on the transaction, including M&A, intellectual property, antitrust and tax matters.

The team is led by Melissa Sawyer, Lauren Boehmke and Spencer Nord. Dustin Guzior and Mehdi Ansari are advising on intellectual property matters. Renata Hesse, Michael Rosenthal, and Kolja Ortmann are advising on antitrust matters. Davis Wang is advising on tax matters.

Knobbe Martens advised Masimo on aspects of the intellectual property due diligence for the transaction.

John Grover, Brian Claassen, and Harnik Shukla led the team, with support from Greg Philips and Brian Horne.