NEW YORK (AP) ¿ Standard & Poor's said Tuesday that Comfort Systems USA Inc. will replace Charlotte Russe Holding Inc. in its S&P SmallCap 600 index after the close of trading Sept. 29.

Advent CR Holdings is planning to acquire Charlotte Russe in a deal expected to close on or about that date.

Houston-based Comfort Systems provides heating, ventilation and air conditioning installation, maintenance, repair and replacement services. It will be added to the S&P SmallCap 600 GICS (Global Industry Classification Standard) Construction & Engineering Sub-Industry index.

Its shares slipped 17 cents, or 1.4 percent, to close at $11.63 on Tuesday before the S&P announcement. In after-hours trading, they gained 96 cents, or 8.3 percent, to $12.59.

Stocks often rise after they are added to major indexes as they are bought by managers of investment funds that mirror the indexes.

Charlotte Russe shares gained a penny to close at $17.47.
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