Top entities: S&P 400, SiriusXM, Masimo, S&P Dow Jones Indices, Danaher Corporation.

What category does this event fall under?

Business — classified as index rebalancing.

What is the sentiment of coverage?

Aggregate sentiment score: 10 on a -100 to +100 scale (negative = critical coverage, positive = favorable coverage).

What were the key actions taken?

S&P Dow Jones Indices announced changes S&P 400 · S&P 400 added SiriusXM · S&P 400 removed Masimo

Is this event still developing?

This is an active story, last updated Jun 08, 2026. Coverage continues to evolve.

Business index rebalancing

Sirius XM joins S&P MidCap 400

Q: When did this event occur?

First reported Jun 08, 2026; last updated Jun 08, 2026.

Q: What is the market impact?

Direct. The market is impacted by the rebalancing of the S&P 400 as funds tracking the index will adjust their portfolios, leading to buying pressure for SiriusXM and selling pressure for Masimo.

Analysis based on 6 articles · First reported Jun 08, 2026 · Last updated Jun 08, 2026

Sentiment

Attention

Articles

Market Impact

Direct

Live prominence charts, article sentiment distribution, and event development timeline available on the NewsDesk Dashboard

Market Impact

The market is impacted by the rebalancing of the S&P 400 as funds tracking the index will adjust their portfolios, leading to buying pressure for SiriusXM and selling pressure for Masimo. This event directly affects the stock prices of the involved companies and the composition of the index.

Media Healthcare Financial Services

Event Summary

SiriusXM Inc. is set to join the S&P 400 index, replacing Masimo Corp. The change will be effective prior to the opening of trading on Thursday, June 11, 2026. Masimo is being removed from the index because Danaher Corporation is acquiring it in a deal expected to be completed soon. S&P Dow Jones Indices, a division of WSP Global, announced these changes, which are part of the regular rebalancing process for financial market indicators.

Key Actions

100 S&P Dow Jones Indices announced changes S&P 400

95 S&P 400 added SiriusXM

90 S&P 400 removed Masimo

85 Danaher Corporation acquiring Masimo

Entities Involved

index

S&P 400

The S&P 400 is undergoing a rebalancing with the addition of SiriusXM and the removal of Masimo, reflecting changes in its constituent companies.

Importance 100 Sentiment 0

stock

SiriusXM

SiriusXM will be added to the S&P 400 index, which is generally seen as a positive development for the company's stock due to increased visibility and potential for institutional investment.

Importance 90 Sentiment 20

stock

Masimo

Masimo will be removed from the S&P 400 index due to its acquisition by Danaher Corp., which is a neutral event for the company as its stock will no longer trade independently.

Importance 80 Sentiment 0

index

S&P Dow Jones Indices

S&P Dow Jones Indices is the entity that announced the changes to the S&P 400 index, reflecting its role as a major provider of financial market indicators.

Importance 70 Sentiment 0

stock

Danaher Corporation

Danaher Corporation is acquiring Masimo, which is the reason for Masimo's removal from the S&P 400. This acquisition is a significant corporate action for Danaher Corporation.

Importance 60 Sentiment 0

stock

WSP Global

WSP Global, through its division S&P Dow Jones Indices, is responsible for managing the S&P 400 and announcing these index changes.

Importance 50 Sentiment 0

NEWSDESK

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