Palantir has been one of the market's biggest winners the past two years.Palantir Technologies (PLTR 2.12%) has been one of the hottest stocks for each of the past two years. After more than quadrupling in price in 2024, the stock is up more than 147% this year.The question on many investors' minds is, can the stock keep the momentum going in 2026? Let's take a closer look to see if investors should be buying the stock before year-end.An AI winnerPalantir started as a data-gathering and analytics company pr ...