Meanwhile, ARK Invest has made an even bigger investment in genetics specialist Twist Bioscience (NASDAQ: TWST). The company weighs in at No. 5 among holdings of the ARK Genomic Revolution Multi-Sector ETF (NYSEMKT: ARKG), and the nearly $420 million ARK Invest has invested in Twist amounts to about 7% of Twist's outstanding shares. Twist's stock has been extremely volatile lately, having risen as much as eightfold from its lows last year before falling back by about a third since mid-January.