Entegris Set to Join S&P MidCap 400

NEW YORK, Feb. 27, 2025 /PRNewswire/ -- Entegris Inc. (NASD: ENTG) will replace Arcadium Lithium plc (NYSE:ALTM) in the S&P MidCap 400 effective prior to the opening of trading on Thursday, March 6. Rio Tinto plc (ASX: RIO) is acquiring Arcadium Lithium in a deal expected to be completed soon, pending final closing conditions.

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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