NEW YORK, May 21, 2015 /PRNewswire/ -- Talen Energy Corp. (NYSE: TLNwi) will replace Windstream Holdings Inc. (NASD: WIN) in the S&P MidCap 400 after the close of trading on Monday, June 1. S&P 500 constituent PPL Corp. (NYSE: PPL) is spinning off Talen Energy in a transaction expected to be completed on or about that date pending final approvals. Windstream is ranked at the bottom of  the S&P MidCap 400 as measured by total market capitalization.

Talen Energy is primarily engaged in the generation and marketing of electricity. Headquartered in Allentown, PA, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Independent Power Producers & Energy Traders Sub-Industry index.

Following is a summary of the change:

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