Palantir (PLTR) Stock After Hours Today (Dec. 17, 2025): Why Shares Fell, What’s Driving the Debate, and What to Watch Before Thursday’s Open
Palantir Technologies Inc. (NASDAQ: PLTR) ended Wednesday’s regular session sharply lower, then steadied in early after-hours trading as investors weighed a familiar mix: powerful AI momentum on the one hand, and persistent valuation and “multiple reversion” risk on the other.