Palantir shares closed slightly higher Thursday, ending a six-day slide that raised concerns over whether the AI stock rally is cooling, according to Investor's Business Daily. The stock edged up to $156.18, though it remains down about 18% from its all-time high of $190. Palantir plunged 9% Tuesday and dipped 1% Wednesday, but still trades above its 50-day moving average. The pullback comes as broader sentiment shifts on artificial intelligence investments. OpenAI’s CEO recently warned of a potential AI bubble, while an MIT study found disappointing returns on AI projects. Short seller Citron Research also said it is betting against Palantir’s lofty valuation.