S&P Indices Announces Change to U.S. Index

NEW YORK, Jan. 19, 2012 /PRNewswire/ -- Cloud Peak Energy Inc. in the S&P SmallCap 600 index after the close of trading on Thursday, January 26. Tekelec is being acquired by a consortium led by Siris Capital Group LLC in a deal expected to be completed on or about that date pending final approvals.

Cloud Peak Energy produces coal. Headquartered in Gillette, WY, the company will be added to the S&P SmallCap 600 GICS (Global Industry Classification Standard) Coal & Consumable Fuels Sub-Industry index.

Following is a summary of the change:

                       S&P SMALLCAP 600  INDEX  - January 26, 2012
                       -------------------------------------------
                 COMPANY                 GICS ECONOMIC SECTOR         GICS SUB-INDUSTRY
                 -------                 --------------------         -----------------
    ADDED   Cloud Peak Energy                   Energy             Coal & Consumable  Fuels
    -----   -----------------                   ------             ------------------------
    DELETED      Tekelec                Information Technology     Communications Equipment
    -------      -------                ----------------------     ------------------------

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For more information:

Dave Guarino, Communications
S&P Indices
dave_guarino@standardandpoors.com
212-438-1471

David Blitzer, Managing Director and Chairman of the Index Committee
S&P Indices
david_blitzer@standardandpoors.com
212-438-3908

S&P Indices
http://www.standardandpoors.com/indices/