Mirion Stock Dives 1.31% as Trading Volume Soars 238% to $0.82 Billion Ranking 127th Amid S&P SmallCap 600 Inclusion

On September 8, 2025, , , . , reflecting heightened market engagement.

Mirion’s inclusion in the S&P SmallCap 600 index, announced by S&P Dow Jones Indices, is expected to enhance its visibility and liquidity. The index review process, aligned with IOSCO principles, underscores the company’s recognition as a key player in the small-cap sector. Analysts suggest this inclusion may attract passive investment flows and improve market depth for the stock.

To evaluate potential strategies, a backtest framework was proposed. It involves selecting the top 500 U.S. stocks by volume, equally weighting them, and trading at next-day open/close prices. The results would be benchmarked against SPY for performance comparison. Transaction costs and liquidity assumptions remain to be finalized before execution.