Standard & Poor's will move
, a hospital operator that's being acquired by an investor group.
, already a member of the S&P 500, will take HCA's place in the S&P 100.
Dick's Sporting Goods
will become a member of the S&P 400, replacing Peabody in that index.
Shares of Peabody were gaining 3.7% to $43 in premarket trading Thursday. Stocks that are added to the S&P 500 usually rise because fund managers who track the index have to purchase the shares for their portfolios.