Standard & Poor's Announces Change to U.S. Index

NEW YORK, Sept. 11  /PRNewswire/ -- Psychiatric Solutions Inc. (NASDAQ:PSYS) will replace RSA Security Inc. (NASDAQ:RSAS) in the S&P MidCap 400 after the close of trading on Thursday, September 14.  RSA Security is being acquired by S&P 500 constituent EMC Corp. (NYSE:EMC) 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/.

Psychiatric Solutions owns and operates psychiatric inpatient facilities, and manages psychiatric inpatient facilities and psychiatric units in hospitals owned by others.  Headquartered in Franklin, TN, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Health Care Facilities Sub-Industry index.

  Following is a summary of the change:

                S&P MIDCAP 400 INDEX - September 14, 2006

                  COMPANY        GICS ECONOMIC SECTOR    GICS SUB-INDUSTRY
  ADDED    Psychiatric Solutions     Health Care      Health Care Facilities
  DELETED      RSA Security     Information Technology   Systems Software



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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DATASOURCE: Standard & Poor's



CONTACT:  David M. Blitzer, Ph.D.

Managing Director & Chairman of the Index Committee

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