The S 500 is up 16% this year, and the market is now in bull market territory, at least by some definitions. But some stocks may have climbed to valuations that are simply too high to sustain, at least in the short term.

Two stocks that Cathie Wood holds in the Ark Innovation fund that analysts think could have limited upside at this point are Palantir Technologies (NYSE: PLTR) and Roku (NASDAQ: ROKU). With that said, here's a closer look at what investors might expect from each of these stocks moving forward.

Data analytics company Palantir has been surging in value this year. Up around 140%, the stock has been a big benefactor of the emergence of artificial intelligence (AI) as Palantir has launched an AI-based platform to capitalize on new growth opportunities. 

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Source Fool.com