The artificial intelligence (AI) specialist will be joining a major stock market index.Shares of Palantir Technologies (PLTR 13.35%) charged out of the gate on Monday, surging as much as 12.8%. As of 11:58 a.m. ET, the stock was still up 12.4%.The catalyst that sent the artificial intelligence (AI) software and data mining specialist higher was an announcement the company would be joining one of the premier stock market indexes.Meet the newest member of the S&P 500An announcement that dropped after the mark ...