Jan 26 (Reuters) - S&P DOW JONES INDICES:

* S&P DOW JONES INDICES SAYS CONSTELLATION ENERGY CORP. WILL REPLACE THE GAP INC. IN THE S&P 500

* S&P DOW JONES INDICES SAYS WATTS WATER TECHNOLOGIES INC. WILL REPLACE STERLING BANCORP/DE IN THE S&P MIDCAP 400 EFFECTIVE PRIOR TO THE MARKET OPEN ON FEBRUARY 1

* S&P DOW JONES INDICES SAYS COMPASS MINERALS INTERNATIONAL WILL REPLACE GREAT WESTERN BANCORP INC. IN THE S&P SMALLCAP 600 EFFECTIVE PRIOR TO THE MARKET OPEN ON FEBRUARY 1

* S&P DOW JONES INDICES SAYS EURONET WORLDWIDE INC. WILL REPLACE COMPASS MINERALS INTERNATIONAL INC. IN THE S&P MIDCAP 400 EFFECTIVE PRIOR TO THE MARKET OPEN ON FEBRUARY 1

* S&P DOW JONES INDICES SAYS JACK IN THE BOX WILL REPLACE SPECTRUM PHARMACEUTICALS INC. IN THE S&P SMALLCAP 600

* S&P DOW JONES INDICES SAYS HOSTESS BRANDS INC. WILL REPLACE WATTS IN THE S&P SMALLCAP 600 EFFECTIVE PRIOR TO THE MARKET OPEN ON FEBRUARY 1

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((Reuters.Briefs@thomsonreuters.com;))