One of 2025's most popular stocks has simply soared too high. Palantir (PLTR -0.10%) stock seems unstoppable. After rising 340% in 2024, shares have already more than doubled in 2025. This puts the company's market capitalization at about $372 billion as of this writing. For context, that's just shy of the combined size of Nike, Walt Disney, and Target. Viewed another way, it's about 36% of the size of Warren Buffett's Berkshire Hathaway -- a diversified conglomerate with a massive insurance operation, abou ...