Cathie Wood's Ark Invest's three ETFs added a combined 83,157 Coinbase shares, or about $13.40 million, during Friday's U.S. stock slump. The increase comes as Coinbase's stock price has fallen about 5% over the past week and its market value has fallen below $30 billion for the first time since September 2024. This is Ark Invest's another bargain buying since March, after adding more than $16 million in a single month.