NEW YORK , June 8, 2026 /PRNewswire/ -- Sirius XM Holdings Inc. (NASD: SIRI) will replace Masimo Corp. (NASD: MASI) in the S&P MidCap 400 effective prior to the opening of trading on Thursday, June 11. S&P 500 & 100 constituent Danaher Corp. (NYSE: DHR ) is acquiring Masimo in a deal expected to be completed soon pending final conditions. Following is a summary of the changes that will take place prior to the open of trading on the effective date: Effective Date Index Name Action Company Name Ticker GICS Sector June 11, 2026 S&P MidCap 400 Addition Sirius XM Holdings SIRI Communication Services June 11, 2026 S&P MidCap 400 Deletion Masimo MASI Health Care ABOUT S&P DOW JONES INDICES S&P Dow Jones Indices is the largest global resource for essential index-based concepts, data and research, and home to iconic financial market indicators, such as the S&P 500® and the Dow Jones Industrial Average®. More assets are invested in products based on our indices than products based on indices from any other provider in the world. Since Charles Dow invented the first index in 1884, S&P DJI has been innovating and developing indices across the spectrum of asset classes helping to define the way investors measure and trade the markets. S&P Dow Jones Indices is a division of S&P Global (NYSE: SPGI ), which provides essential intelligence for individuals, companies, and governments to make decisions with confidence. For more information, visit www.spglobal.com/spdji/en/ . FOR MORE INFORMATION: S&P Dow Jones Indices [email protected] Media Inquiries [email protected] SOURCE S&P Dow Jones Indices 21 % more press release views with Request a Demo
