The ARK Innovation exchange-traded fund (ticker: ARKK) went from a somewhat drowsy actively managed fund that returned 36% in 2019, to the top performer in 2020, returning 153% and making its manager, ARK Investment founder Cathie Wood, a family name. ARK Innovation is having a rough 2021: After increasing another 26% by mid-February, the $22 billion ETF has actually tumbled over the previous six weeks, and is now down 9% year to date.