Following Palantir Technologies' (PLTR 2.53%) recent customer event, Jefferies analyst Brent Hill maintained an underperform (sell) rating on the shares with a $60 price target, implying potential downside of 29% from the current share price.Palantir stock has had an incredible run over the past two years, climbing 971%. The company's artificial intelligence (AI) platform has been in strong demand, but more analysts on Wall Street are starting to sound the alarm on the stock's high valuation.Should investor ...