Masimo is providing supplemental information to its April 1, 2026, definitive proxy statement regarding the proposed merger with Danaher Corporation. The supplement addresses claims made in three separate stockholder lawsuits and various demand letters alleging that the original proxy statement was inaccurate or incomplete. The company maintains that the claims are without merit but is providing the additional disclosures to mitigate litigation risks and potential delays to the merger. The supplemental information includes additional background on the sale process, including previous outreach to potential acquirors and details on financial advisor Centerview Partners' valuation analyses. The special meeting of stockholders remains scheduled for May 1, 2026, and the board continues to recommend a vote in favor of the merger.