Standard & Poor's said Monday oil and gas company Range Resources Corp. will replace Tribune Co. in the S&P 500.
The change will be made on Thursday, about the same day the deal is expected to be taken private.
Standard & Poor's also said Salix Pharmaceuticals Ltd., which develops and markets prescription drugs to treat gastrointestinal diseases, will replace laser and optics products maker Coherent Inc. in the S&P SmallCap 600 after trading ends on Tuesday.
The move comes after the board of directors of Nasdaq informed Coherent that its stock is scheduled to be delisted by the exchange after the close of trading that day.
In aftermarket activity, shares of Range Resources rose $1.55, or 3.5 percent, to $46.30. Earlier, they fell 96 cents, or 2.1 percent, to end the regular trading session at $44.75.
Salix shares fell 34 cents, or 3 percent, to $11.16 Monday.
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