NEW YORK, July 2, 2012 /PRNewswire/ -- Rosetta Resources Inc. (NASD: ROSE) will replace Catalyst Health Solutions Inc. (NASD: CHSI) in the S&P MidCap 400 index after the close of trading on Thursday, July 5. SXC Health Solutions Corp. (NASD: SXCI) is acquiring Catalyst Health Solutions in a deal expected to be completed tonight pending final approvals.

Rosetta Resources engages in the acquisition, exploration, development, and production of onshore oil and gas resources. Headquartered in Houston, TX, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Oil & Gas Exploration & Production Sub-Industry index.

Following is a summary of the change:

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