NEW YORK, May 25, 2017 /PRNewswire/ -- Matador Resources Company (NYSE: MTDR) will replace Western Refining, Inc. (NYSE: WNR) in the S&P MidCap 400 effective prior to the open on Friday, June 2. S&P 500 constituent Tesoro Corp. (NYSE: TSO) is acquiring Western Refining in a deal expected to be completed on or about that date, pending final conditions.

Matador Resources engages in the exploration, development, production, and acquisition of oil and natural gas resources. Headquartered in Dallas, 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 changes:

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