XTO Xto Energy, Inc.

NEW YORK, June 22 /PRNewswire/ -- S&P will make the following changes to the S&P 500, S&P MidCap 400 and  S&P SmallCap 600 Indices after the close of trading on Friday, June 25, 2010:

• S&P MidCap 400 constituent CarMax Inc. (NYSE: KMX) will replace XTO Energy Inc. (NYSE: XTO) in the S&P 500, S&P SmallCap 600 constituent Acuity Brands Inc. (NYSE: AYI) will replace CarMax in the S&P MidCap 400, and Medifast Inc. (NYSE: MED) will replace Acuity Brands in the S&P SmallCap 600 index. S&P 100 & 500 constituent Exxon Mobil Inc. (NYSE: XOM) is acquiring XTO Energy in a deal expected to be completed on or about that date, pending final approvals.

• S&P SmallCap 600 constituent Gardner Denver Inc. (NYSE: GDI) will replace Palm Inc. (Nasdaq: PALM) in the S&P MidCap 400 index, and Cogent Inc. (Nasdaq: COGT) will replace Gardner Denver in the S&P SmallCap 600 index.  S&P 100 & 500 constituent Hewlett-Packard Co. (NYSE: HPQ) is acquiring Palm in a deal expected to be completed soon, pending final approvals.

Standard & Poor's will monitor these transactions, and post any relevant updates on its website: www.standardandpoors.com.

CarMax operates as a retailer of used cars. Headquartered in Richmond, VA, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Automotive Retail Sub-Industry index.  

Acuity Brands designs, produces, and distributes indoor and outdoor lighting fixtures and related products. Headquartered in Atlanta, GA, the company will be added to the S&P MidCap 400 GICS Electrical Components & Equipment Sub-Industry index.  

Medifast engages in the production, distribution, and sale of weight management and disease management products. Headquartered in Owings Mills, MD, the company will be added to the S&P SmallCap 600 GICS Personal Products Sub-Industry index.  

Gardner Denver designs, manufactures, and markets engineered industrial machinery and related parts and services. Headquartered in Quincy, IL, the company will be added to the S&P MidCap 400 GICS Industrial Machinery Sub-Industry index.

Cogent provides automated fingerprint identification systems and other fingerprint biometrics solutions to governments, law enforcement agencies, and other organizations. Headquartered in Pasadena, CA, the company will be added to the S&P SmallCap 600 GICS Electronic Equipment & Instruments Sub-Industry index.

Following is a summary of the changes:

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SOURCE Standard & Poor's