There's something worth paying attention to here. Palantir's AI platform is genuinely impressive - Forrester and Morgan Stanley both rank it as a leader in enterprise AI decisioning, and the financials back it up. Revenue jumped 70% last year, margins hit 57%, and their Rule of 40 score sits at an unprecedented 127%. Customer count up 34% to 954, average spend per customer up 139%. On paper, this looks like a company firing on all cylinders.

But here's the thing that's been nagging at me: the valuation is absolutely wild. Palantir trades at 74 times sales - making it the most expensive stock in the S&P 500 by a massive margin. The second most expensive is AppLovin at 30x sales. That's not even close. Even after a 37% drop from highs, the company could lose more than half its value and still hold the title.

What makes this even more interesting is what CEO Alex Karp has been doing quietly. While he's been publicly calling out short-sellers as market manipulators - especially when figures like Michael Burry, who famously shorted the housing market before 2008, disclosed a substantial short position in Q3 2025 - Karp himself has been dumping stock. Over the last three years, he's sold $2.2 billion worth of Palantir shares. That's a lot of conviction in the opposite direction of his public stance.

He still owns 6.4 million Class A shares worth around $832 million as of November 2025, so he's hardly bailing completely. But when an insider of that caliber is systematically selling this much, it sends a signal. The company's AI leadership and execution are real. The financial results are genuinely strong. But at this valuation, even great companies have risk-reward profiles that skew the wrong way. Sometimes the smartest move is taking profits when insiders are doing the same.