Cathie Wood is struggling to get the balance right in her growth stock portfolios. The Ark Invest co-founder, CEO, and chief investment officer is losing to the market for the third time in the last four years. She's trying not to keep it that way.

Wood offers up the daily transactions across her half-dozen exchange-traded funds. What's she buying these days? Ark Invest added to existing positions in Ibotta (NYSE: IBTA), Roblox (NYSE: RBLX), and Guardant Health (NASDAQ: GH) on Thursday. Let's take a closer look.

There's no shortage of market debutantes this year that have faltered after the initial spark. Ibotta is the latest of the sinker stinkers. The digital marketing platform that rewards its growing user base for making purchases through its advertising partners went public at $88 in April, only to open at $117 on its first day of trading. It's all been downhill from there. The stock has gone on to shed more than half of its opening high, closing below $50 on Thursday.

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Source Fool.com