Let's not try to jinx things by calling attention to this, but Cathie Wood's on a roll this year. The largest of the exchange-traded funds she runs at Ark Investment Management is up nearly 23% this month. Momentum is back after a punishing last two years. 

Ark publishes its daily buys and sells, and it did a little shopping on Thursday. Wood added to her existing stakes in Pinterest (NYSE: PINS), CareDx (NASDAQ: CDNA), and Teladoc Health (NYSE: TDOC) yesterday. Let's take a closer look.

Pinterest went from initial pandemic hero to a reopening play zero, but it's clawing its way back these days. The visual search engine that helped users with recipes and room design tips as they hunkered down in 2020 is now trading closer to its 52-week high than its low. 

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Source Fool.com