NEW YORK, Sept. 24, 2012 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P 500, the S&P MidCap 400 and the S&P SmallCap 600 indices after the close of trading on Friday, September 28:

• The ADT Corp. (NYSE:ADTwi) will replace Lexmark International Inc. (NYSE:LXK) in the S&P 500, and Lexmark will replace RadioShack Corp. (NYSE:RSH) in the S&P MidCap 400. Pentair Ltd. (NYSE:PNRwi) will replace DeVry Inc. (NYSE:DV) in the S&P 500, and DeVry will replace Pentair Inc. (NYSE:PNR) in the S&P MidCap 400. S&P 500 constituent Tyco International Ltd. (NYSE:TYC) is spinning off ADT to Tyco shareholders. Tyco is simultaneously spinning off its flow control business, which will immediately merge with Pentair Inc. to form a new entity to be called Pentair Ltd. Both spin-offs are expected to be completed after the close of trading on September 28. The Tyco stub will remain in the S&P 500. Lexmark and DeVry have market capitalizations that are more representative of the mid cap market space, and RadioShack's market capitalization makes it no longer appropriate for inclusion in the S&P 1500.
• MarketAxess Holdings Inc. (NASD:MKTX) will replace Par Pharmaceutical Companies, Inc. (NYSE:PRX) in the S&P SmallCap 600. Par Pharmaceutical is being acquired by an affiliate of TPG, a private equity firm, in a transaction expected to be completed on or about September 28.

ADT is a provider of electronic security, interactive home and business automation and related monitoring services. Headquartered in Boca Raton, Florida, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Security and Alarm Services Sub-Industry index.

Pentair is a global diversified industrial company. Headquartered in Switzerland, the company will be added to the S&P 500 Industrial Machinery Sub-Industry index.

Lexmark International engages in the development, manufacture, and supply of printing, imaging, document workflow, and content management solutions. Headquartered in Lexington, KY, the company will be added to the S&P MidCap 400 Computer Storage & Peripherals Sub-Industry index.

DeVry provides educational services. Headquartered in Downers Grove, IL, the company will be added to the S&P MidCap 400 Education Services Sub-Industry index.

MarketAxess Holdings operates an electronic trading platform. Headquartered in New York, NY, the company will be added to the S&P SmallCap 600 Specialized Finance Sub-Industry index.

Following is a summary of the changes:

Additions to and deletions from S&P  Dow Jones Indices do not in any way reflect an opinion on the investment merits of the companies involved.

About S&P Dow Jones Indices

S&P Dow Jones Indices LLC, a subsidiary of The McGraw-Hill Companies is the world's largest, global resource for index-based concepts, data and research. Home to iconic financial market indicators, such as the S&P 500^® and the Dow Jones Industrial Average^SM, S&P Dow Jones Indices LLC has over 115 years of experience constructing innovative and transparent solutions that fulfill the needs of institutional and retail investors. More assets are invested in products based upon our indices than any other provider in the world. With over 830,000 indices covering a wide range of assets classes across the globe, S&P Dow Jones Indices LLC defines the way investors measure and trade the markets. To learn more about our company, please visit www.spdji.com.

It is not possible to invest directly in an index. S&P Dow Jones Indices LLC, Dow Jones, and their respective affiliates, parents, subsidiaries, directors, officers, shareholders, employees and agents (collectively "S&P Dow Jones Indices") does not sponsor, endorse, sell, or promote any investment fund or other vehicle that is offered by third parties and that seeks to provide an investment return based on the returns of any S&P Dow Jones Indices index. This document does not constitute an offer of services in jurisdictions where S&P Dow Jones Indices or its affiliates do not have the necessary licenses. S&P Dow Jones Indices receives compensation in connection with licensing its indices to third parties.

STANDARD & POOR'S and S&P are registered trademarks of Standard & Poor's Financial Services LLC.  "Dow Jones" is a registered trademark of Dow Jones Trademark Holdings LLC ("Dow Jones").

SOURCE S&P Dow Jones Indices