Palantir was the most expensive stock ever for a company of its size — until the selloff

1. Palantir’s stock recently peaked at a $493 billion market cap. 2. It had a valuation of 255.3 times forward earnings before a big selloff. 3. Analysts caution that its high valuation could result in valuation reversion. 4. Retail investors significantly boosted Palantir's share price over the years. 5. CEO defends valuation amidst skepticism from analysts and short sellers.