GameStop Stock’s Possible Return to S&P 500 in Hands of Anonymous Committee

The individual-investor darling GameStop Corp. is now three times as valuable as the smallest S&P 500 stocks, thanks to a sharp run-up in its shares in August.

Some traders are betting GameStop could take another leap higher if S&P Dow Jones Indices adds the stock to the S&P 500 when it is rebalanced later this month.