Vistra (VST), a Texas-based electric utility and power producer, will join the S&P 500 index on May 8, replacing Pioneer Natural Resources, the oil and gas company that has been purchased by Exxon Mobil (XOM).
Vistra’s inclusion in the S&P 500 index comes after the company’s share price more than doubled (up 114%) so far this year.
Through 12 months, Vistra’s share price has risen 249%, giving the company a market capitalization of $28.43 billion U.S.
Aaon (AAON), which is involved in heating, ventilation, and air conditioning, will replace Vistra in the S&P MidCap 400 index.
Bitcoin miner Marathon Digital (MARA) will replace Aaon in the S&P SmallCap 600 index.
All changes were announced by S&P Dow Jones Indices and take effect on May 8.