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 Index Action Company Name Ticker GICS Sector Date Name June 11, 2026 S&P MidCap 400 Addition Sirius XM SIRI Communication Holdings Services June 11, 2026 S&P MidCap 400 Deletion Masimo MASI Health Care

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