NEW YORK, June 18, 2025 /PRNewswire/ -- APi Group Corp. (NYSE:APG) will replace United States Steel Corp. (NYSE:X) in the S&P MidCap 400 effective prior to the opening of trading on Tuesday, June 24. Nippon Steel Corp. (TSE: 5401) acquired United States Steel in a deal that closed today.

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 24, 2025	S&P MidCap 400	Addition	APi Group	APG	Industrials
June 24, 2025	S&P MidCap 400	Deletion	United States Steel	X	Materials

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SOURCE S&P Dow Jones Indices

APi Group Set to Join S&P MidCap 400