Palantir’s (NYSE: PLTR) surging stock price to new highs may not last long after investment banking giant Jefferies downgraded the equity due to concerns over growth prospects.Jefferies’ analyst Brent Thill downgraded the stock from ‘Hold’ to ‘Underperform,’ warning that the firm might not meet the growth expectations implied by its current valuation, he said in an investor note on November 7.Thill maintained his price target of $28, emphasizing that Palantir faces a significant challenge justifying its hig ...