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NEW YORK, Sept. 27 /PRNewswire/ -- S&P will make the following changes to the S&P MidCap 400 and SmallCap 600 Indices:

• Rackspace Hosting Inc. (NYSE: RAX) will replace AmeriCredit Corp. (NYSE: ACF) in the S&P MidCap 400 after the close of trading on Thursday, September 30. AmeriCredit is being acquired by General Motors Holdings LLC in a deal expected to close on or about that date pending final approvals.

• S&P SmallCap 600 constituent Watsco Inc. (NYSE: WSO) will replace Hewitt Associates Inc. (NYSE: HEW) in the S&P MidCap 400, and Super Micro Computer Inc. (NASD: SMCI) will replace Watsco in the S&P SmallCap 600 after the close of trading on Friday, October 1. Hewitt Associates is being acquired by S&P 500 constituent Aon Corp. (NYSE: AON) in a deal expected to close on or about that date pending final approvals.

• Riverbed Technology Inc. (NASD: RVBD) will replace NBTY Inc. (NYSE: NTY) in the S&P MidCap 400 after the close of trading on a date to be announced. NBTY is being acquired by affiliates of The Carlyle Group in a deal expected to close soon, pending the completion of a marketing period.

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

Rackspace Hosting operates in the hosting and cloud computing industry. Headquartered in San Antonio, TX, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Internet Software & Services Sub-Industry index.  

Watsco distributes air conditioning, heating, and refrigeration equipment and related parts and supplies. Headquartered in Coconut Grove, FL, the company will be added to the S&P MidCap 400 GICS Trading Companies & Distributors Sub-Industry index.

Super Micro Computer Inc. designs, develops, manufactures, and sells server solutions. Headquartered in San Jose, CA, the company will be added to the S&P SmallCap 600 GICS Computer Hardware Sub-Industry index.  

Riverbed Technology provides solutions to the fundamental problems of wide-area distributed computing. Headquartered in San Francisco, CA, the company will be added to the S&P MidCap 400 GICS Communications Equipment Sub-Industry index.

Following is a summary of the changes:

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SOURCE Standard & Poor's