Cathie Wood’s ARK Invest was a poster child for success in 2020.Between the March 2020 “COVID Crash” lows and February 2021, its top exchange-traded fund, ARK Innovation ETF (NYSEARCA: ARKK) gained more than 313%.This made ARKK one of the top-performing ETFs, and thrust ARK honcho Cathie Wood into the spotlight as a top stock picker.