Shares of Palantir Technologies Inc. PLTR sank 0.19% to $36.38 Wednesday, on what proved to be an all-around dismal trading session for the stock market, with the S&P 500 Index SPX falling 0.29% to 5,618.26 and Dow Jones Industrial Average DJIA falling 0.25% to 41,503.10. The stock's fall snapped an eight-day winning streak.

The Palantir Technologies logo is displayed on a shipping container at the companys booth during the ... [+] Consumer Electronics Show (CES) in Las Vegas, Nevada on January 5, 202

Now that Palantir is bound for the S&P 500, what does that mean for investors today? The stock price has already risen more than 127% over the past year. Should you buy Palantir stock now? Here is what you need to know.

Shares of Palantir Technologies Inc. PLTR inched 0.39% higher to $36.45 Tuesday, on what proved to be an all-around mixed trading session for the stock market, with the S&P 500 Index SPX rising 0.03% to 5,634.58 and the Dow Jones Industrial Average DJIA falling 0.04% to 41,606.18.

Palantir Technologies (PLTR) stock has been rising, well over analysts' targets. Those targets keep moving higher as well. Is PLTR stock a bargain here? One key is its free cash flow and FCF margin. These metrics could surprise the market in the next several quarters.