Standard & Poor's Announces Changes to U.S. Indices

NEW YORK, Jan. 17 /PRNewswire/ -- S&P 500 constituent UnitedHealth Group Inc. will replace Harrah's Entertainment Inc. in the S&P 100, S&P MidCap 400 constituent Cameron International Corp. will replace Harrah's Entertainment in the S&P 500, and Corrections Corporation of America will replace Cameron International in the S&P MidCap 400 after the close of trading on Monday, January 28. Harrah's Entertainment is being taken private in a deal expected to close on or about that date, pending final approvals.

Standard & Poor's will monitor this transaction, and post any relevant updates on its website: http://www.standardandpoors.com/.

UnitedHealth Group, which owns and manages organized health systems, is headquartered in Minnetonka, MN.

Cameron International provides flow equipment products, systems, and services to oil, gas, and process industries worldwide. Headquartered in Houston, TX, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Oil & Gas Equipment & Services Sub-Industry index.

Corrections Corporation of America owns and operates privatized correctional and detention facilities in the United States. Headquartered in Nashville, TN, the company will be added to the S&P MidCap 400 GICS Diversified Commercial & Professional Services Sub-Industry index.

Following is a summary of the changes: S&P 100 INDEX - January 28, 2008 COMPANY GICS ECONOMIC GICS SUB-INDUSTRY SECTOR ADDED UnitedHealth Health Care Managed Health Group Care DELETED Harrah's Consumer Casinos & Gaming Entertainment Discretionary S&P 500 INDEX - January 28, 2008 COMPANY GICS ECONOMIC GICS SUB-INDUSTRY SECTOR ADDED Cameron Energy Oil & Gas International Equipment & Services DELETED Harrah's Consumer Casinos & Gaming Entertainment Discretionary S&P MIDCAP 400 INDEX - January 28, 2008 COMPANY GICS ECONOMIC GICS SUB-INDUSTRY SECTOR ADDED Corrections Industrials Diversified Corporation of Commercial & America Professional Services DELETED Cameron Energy Oil & Gas International Equipment & Services

Additions to and deletions from an S&P equity index do not in any way reflect an opinion on the investment merits of the companies concerned.

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