Corebridge Financial Set to Join S&P MidCap 400

Rhea-AI Summary

Corebridge Financial (NYSE:CRBG) will be added to the S&P MidCap 400 prior to the open on Dec 17, 2025, replacing Allete (NYSE:ALE), which will be deleted on the same date.

The change follows an announced acquisition of Allete by Canada Pension Plan Investment Board and Global Infrastructure Partners, which is expected to close soon pending final conditions.

Positive

• Corebridge (CRBG) added to S&P MidCap 400 effective Dec 17, 2025
• Index inclusion may increase passive demand for CRBG shares

Negative

• Allete (ALE) removed from S&P MidCap 400 effective Dec 17, 2025
• Allete pending acquisition—transaction completion conditional on closing conditions

News Market Reaction – SPGI

-0.28%

1 alert

-0.28% News Effect

On the day this news was published, SPGI declined 0.28%, reflecting a mild negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

NEW YORK, Dec. 12, 2025 /PRNewswire/ -- Corebridge Financial Inc. (NYSE: CRBG) will replace Allete Inc. (NYSE: ALE) in the S&P MidCap 400 effective prior to the open of trading on Wednesday, December 17. Canada Pension Plan Investment Board and Global Infrastructure Partners are acquiring Allete in a deal expected to close soon, pending final closing conditions.

Following is a summary of the change that will take place prior to the open of trading on the effective date:

Effective Date	Index Name	Action	Company Name	Ticker	GICS Sector
Dec 17, 2025	S&P MidCap 400	Addition	Corebridge Financial	CRBG	Financials
Dec 17, 2025	S&P MidCap 400	Deletion	Allete	ALE	Utilities

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
index_services@spglobal.com

Media Inquiries
spdji.comms@spglobal.com

View original content:https://www.prnewswire.com/news-releases/corebridge-financial-set-to-join-sp-midcap-400-302640515.html

SOURCE S&P Dow Jones Indices

FAQ

When will Corebridge (CRBG) join the S&P MidCap 400?

Corebridge will be added to the S&P MidCap 400 prior to the open on Dec 17, 2025.

Why is Allete (ALE) being removed from the S&P MidCap 400 on Dec 17, 2025?

Allete is being deleted from the index because it is the target of a pending acquisition by Canada Pension Plan Investment Board and Global Infrastructure Partners.

What does the Dec 17, 2025 index change mean for CRBG shareholders?

Index addition typically increases passive fund demand for CRBG shares around the effective date.

Is the Allete acquisition final and how does it affect ALE shares?

The acquisition is expected to close soon but remains subject to final closing conditions.

Which tickers and sectors are affected by the Dec 17, 2025 change?

CRBG (Financials) will be added and ALE (Utilities) will be deleted from the S&P MidCap 400 on Dec 17, 2025.