Antero Resources Set to Join S&P MidCap 400

NEW YORK, Oct. 17, 2022 /PRNewswire/ -- Antero Resources Corp. (NYSE: AR) will replace Alleghany Corp. (NYSE: Y) in the S&P MidCap 400 effective prior to the opening of trading on Thursday, October 20. S&P 500 constituent Berkshire Hathaway Inc. (NYSE: BRK.A; BRK.B) is acquiring Alleghany in a deal expected to be completed soon, pending final closing conditions.

Following is a summary of the changes that will take place prior to the open of trading on the effective date:

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