Sirius XM Holdings Set to Join S&P MidCap 400
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 | Index | 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 | |
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