Exhibit 99.1 Masimo Announces Preliminary Second Quarter 2024 Revenue and Select Financial Results Irvine, California, July 9, 2024 - Masimo Corporation (Nasdaq: MASI) today announced preliminary revenue and select financial results for the second quarter ended June 29, 2024. Preliminary Second Quarter 2024 Revenue and Select Financial Results: • Consolidated revenue is expected to be approximately $496 million, representing 9% growth on a reported basis and 10% growth on a constant currency basis; • Health ...