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

NEW YORK, April 25, 2011 /PRNewswire/ -- S&P SmallCap 600 constituent Catalyst Health Solutions Inc. (NASD: CHSI) will replace AirTran Holdings Inc. (NYSE: AAI) in the S&P MidCap 400 index, and Calamos Asset Management Inc. (NASD: CLMS) will replace Catalyst Health Solutions in the S&P SmallCap 600 index after the close of trading on Monday, May 2, 2011. S&P 500 constituent Southwest Airlines Co (NYSE: LUV) is acquiring AirTran Holdings in a deal expected to be completed on or about that date pending final approvals.

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

Catalyst Health Solutions operates as a pharmacy benefit management company.  Headquartered in Rockville, MD, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Health Care Services Sub-Industry index.

Calamos Asset Management is a publicly owned investment manager. Headquartered in Naperville, IL, the company will be added to the S&P SmallCap 600 GICS Asset Management & Custody Banks Sub-Industry index.

Following is a summary of the changes:


S&P MIDCAP 400 INDEX  – May 2, 2011


COMPANY

GICS ECONOMIC SECTOR

GICS SUB-INDUSTRY

ADDED

Catalyst Health Solutions

Health Care

Health Care Services

DELETED

AirTran Holdings

Industrials

Airlines





S&P SMALLCAP 600 INDEX  – May 2, 2011


COMPANY

GICS ECONOMIC SECTOR

GICS SUB-INDUSTRY

ADDED

Calamos Asset Management

Financials

Asset Management & Custody Banks

DELETED

Catalyst Health Solutions

Health Care

Health Care Services




For more information about S&P Indices, please visit www.standardandpoors.com/indices.

About S&P Indices

S&P Indices, the world's leading index provider, maintains a wide variety of investable and benchmark indices to meet an array of investor needs. Over $1.25 trillion is directly indexed to Standard & Poor's family of indices, which includes the S&P 500, the world's most followed stock market index, the S&P/Case-Shiller Home Price Indices, the leading measure of U.S. home prices, the S&P Global BMI, an index with approximately 11,000 constituents, the S&P GSCI, the industry's most closely watched commodities index, and the S&P National AMT-Free Municipal Bond Index, the premier investable index for U.S. municipal bonds. For more information, please visit www.standardandpoors.com/indices.

For more information contact:
David M. Blitzer, Ph.D.
Managing Director & Chairman of the Index Committee
(212) 438-3907

SOURCE Standard & Poor's

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