Cathie Wood's firm ARK Invest staked a large position in Elon Musk's SpaceX on Friday. The firm already has a huge chunk of Tesla stock.

Cathie Wood's firm ARK Invest sold stock 10 million shares of stock in 20 different companies this week

Cathie Wood's ARK Invest purchased 3.29 million SpaceX shares, boosting its largest fund holding ahead of a potential $1.75 trillion IPO on Nasdaq.