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:

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