Palantir (PLTR -4.09%) stock has been one of the top performers in 2025. In the first half of the year, its stock has soared around 90%. That's fantastic news for Palantir shareholders, but they must ask the question: Has Palantir's business performed well enough to warrant that rise? Judging from its finances and stock valuation, that answer would be a resounding no. The reality is that Palantir's fundamentals don't support its current price tag, and investors need to be cautious holding onto shares at the ...