Mirion Technologies to Replace GMS in S&P SmallCap 600

Mirion Technologies will replace GMS in the S&P SmallCap 600 effective September 9. Mirion Technologies is an information technology company, while GMS is in the industrials sector. The change is due to Home Depot acquiring GMS. S&P Dow Jones Indices is the largest global resource for essential index-based concepts, data, and research.

Mirion Technologies Inc. (NYSE: MIR) will replace GMS Inc. (NYSE: GMS) in the S&P SmallCap 600 effective September 9, 2025 [1]. The change is a result of Home Depot Inc. (NYSE: HD) acquiring GMS, which was announced on June 30, 2025 [3]. The acquisition will see GMS become a subsidiary of Home Depot's specialty trade distribution subsidiary, SRS Distribution Inc.

Mirion Technologies, an information technology company, will enter the S&P SmallCap 600 index, while GMS, a distributor of specialty building products including drywall, ceilings, and steel framing, will exit the index [1]. The move reflects the shift in the industrial sector and the impact of acquisitions on market indices.

Home Depot completed the acquisition of GMS for a total enterprise value of approximately $5.5 billion [3]. The acquisition was motivated by Home Depot's strategy to increase its share of business with professional contractors. The tender offer for GMS shares expired on September 3, with approximately 79.5% of outstanding shares validly tendered [3]. The Home Depot has accepted these shares for payment at $110 per share in cash.

S&P Dow Jones Indices is the largest global resource for essential index-based concepts, data, and research, providing investors with essential tools to measure and trade the markets [1]. The S&P SmallCap 600 index is a market-capitalization-weighted index of the 600 smallest companies in the S&P 1500 Composite Index.

This change in the S&P SmallCap 600 index highlights the dynamic nature of the financial markets and the impact of mergers and acquisitions on market indices. Investors should monitor the performance of both companies to understand the potential implications of this shift.

References:
[1] https://www.prnewswire.com/news-releases/mirion-technologies-set-to-join-sp-smallcap-600-302547135.html
[2] https://www.cnn.com/markets/stocks/GMS
[3] https://www.investing.com/news/company-news/home-depot-completes-55-billion-acquisition-of-gms-through-srs-93CH-4224357