After a dramatic bull run in recent weeks, Palantir Technologies (PLTR -5.82%) stock was finally giving up gains, as investors seemed to be taking profits after Friday's pop. That jump was driven by Palantir's announcement that it would be listing as a Nasdaq stock and that it expected to join the Nasdaq-100, which would trigger exchange-traded funds (ETFs) that track that index to buy the high-flying artificial intelligence (AI) stock.Among those selling the stock was CEO Alex Karp, who filed to sell 4.5 m ...