Unstoppable. That's the word that comes to mind in describing how Palantir Technologies ( PLTR -2.26%) stock performed in recent years. Since 2023, the stock has generated incredible returns of more than 2,100%. During that time frame, a $5,000 investment into the data analytics company would have grown to more than $110,000.

Palantir Technologies shares climbed to an all-time high Monday, topping Friday's record amid broader gains for U.S. stocks.

Palantir's current valuation leaves little upside and significant downside risk, despite strong operational progress and AI/defense tailwinds. See why PLTR stock is a Sell.