These are the stocks helping to tank the high-flying ARK Innovation ETF over the past week By: MarketWatch February 23, 2021 at 11:57 AM EST The actively managed ETF's largest holding is Tesla, accounting for 8.3% of assets. Read More >> Related Stocks: Ark Innovation ETF Baidu.com SP ADR Block Inc NDX Nasdaq Composite Nasdaq ETF Roku Inc Teladoc Health Inc Tesla, Inc.