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Sirius XM Holdings Set to Join S&P MidCap 400

prnewswire.com
SIRI Sirius XM Holdings is set to join the S&P MidCap 400 index. This is a factual announcement with no inherent positive or negative sentiment towards the company's performance or future prospects. SPGI S&P Global Inc. is mentioned as the provider of the S&P MidCap 400 index. The article is a factual announcement about index inclusion and does not provide sentiment on S&P Global's business. MASI Masimo Corporation is mentioned in the context of potential additions to the S&P MidCap 400. The article is a factual announcement and does not offer sentiment on Masimo's performance. DHR Danaher Corporation is mentioned in the context of potential additions to the S&P MidCap 400. The article is a factual announcement and does not offer sentiment on Danaher's performance.

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

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