There's no clear reason for the drop, but that doesn't mean investors should blindly buy the stock.Palantir Technologies (PLTR -0.92%) has been the best-performing stock in the S&P 500 this year. On Aug. 12, it touched an intraday high of $190 per share, 151% above where it started 2025.Since then, however, shares have slipped significantly, dropping as much as 25% within a few days before recovering slightly. They still trade 18% below their all-time high.Some investors may see the pullback as an opportuni ...