Mirion Technologies Inc. (NYSE: MIR) will replace GMS Inc. (NYSE: GMS) in the S&P SmallCap 600 effective prior to the opening of trading on Tuesday, September 9. S&P 500 and 100 constituent Home Depot Inc. (NYSE: HD) acquired GMS in a deal that was completed today.

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 September 9, 2025 S&P SmallCap 600 Addition Mirion Technologies MIR Information Technology September 9, 2025 S&P SmallCap 600 Deletion GMS GMS Industrials

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