NEW YORK, April 4, 2012 /PRNewswire/ -- Cinemark Holdings, Inc.  (NYSE: CNK) will replace NSTAR (NYSE: NST) in the S&P MidCap 400 index after the close of trading on Monday, April 9. S&P 500 constituent Northeast Utilities (NYSE: NU) is acquiring NSTAR in a deal expected to be completed on or about that date, pending final approvals.

Cinemark Holdings builds, acquires and manages movie theatres. Headquartered Plano, TX, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Movies & Entertainment Sub-Industry index.

Following is a summary of the change:

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