Masimo to be Acquired by Danaher for $180.00 Per Share in $9.9 Billion All-Cash Transaction
MASI sits 39% above its 52-week low of $125.94.
Summary
Masimo has filed the definitive proxy statement detailing its $9.9 billion all-cash acquisition by Danaher Corporation for $180.00 per share, supported by unanimous board approval and a key shareholder voting agreement.
Key Events · M&A and Partnerships · MASI
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Definitive Merger Agreement Filed
Masimo has entered into a definitive agreement to be acquired by Danaher Corporation for $180.00 per share in cash.
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Total Transaction Value
The all-cash transaction is valued at approximately $9.9 billion.
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Unanimous Board Approval
Both Masimo's and Danaher's Boards of Directors have unanimously approved the acquisition.
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Key Shareholder Voting Agreement
Politan Capital Management LP, a significant shareholder, has entered into a voting and support agreement to vote in favor of the merger.
Analysis · MASI · Industrial Applications And Services
This DEFA14A filing provides the definitive merger agreement and related voting support agreement for Masimo's acquisition by Danaher Corporation, following the initial 8-K announcement on 2026-02-17. The all-cash offer of $180.00 per share, totaling approximately $9.9 billion, represents a significant premium over the company's recent trading levels. The unanimous board approval and a voting agreement from a major shareholder, Politan Capital Management LP, indicate strong internal support for the transaction, which is a transformative event for Masimo, positioning it as a standalone business unit within Danaher's Diagnostics segment.
How filings like this one have moved
In the 30 days to Sep 30, 2026, 41.9% of the 322 measured filings Wiseek scored 9 moved their stock by 5% or more by the next session's close. The median move was -0.38%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, MASI was trading at $175.24 on NASDAQ in the Industrial Applications And Services sector, with a market capitalization of approximately $7B. The 52-week trading range was $125.94 to $194.88. This filing was assessed with positive market sentiment and an importance score of 9 out of 10.