Both PLTR and DELL have built sizable year-to-date gains, and could soon add to themTwo tech stocks are making moves on the charts today. On Friday after the close, it was announced Palantir Technologies Inc (NYSE:PLTR) and Dell Technologies Inc (NYSE:DELL) would join the S&P 500 Index (SPX) starting Sept. 23. Palantir is replacing American Airlines (AAL), while Dell is replacing e-tailer Etsy (ETSY). PLTR and DELL are both ripping higher in response to the news.Palantir stock was last seen up 12.1% to trad ...