The market rally in growth stocks is changing the way that Cathie Wood approaches her portfolio moves as the co-founder and CEO of Ark Invest. She has spent most of the past couple of years adding to existing stakes on dips. Now she isn't afraid to buy into the upswing.

Wood bought shares of Palantir Technologies (NYSE: PLTR), Toast (NYSE: TOST), and (NASDAQ: ROKU) on Thursday, building up some of her largest positions. Roku has been sinking lately, but Palantir and Toast hit new recent highs on Thursday. Let's take a closer look at these three purchases.

Shares of Palantir hit another two-year high on Thursday. The software developer for the intelligence community has seen its stock more than quadruple since the start of last year.

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Source Fool.com