Ark Invest's purchase of Circle (CRCL) shares came as the stablecoin firm reported Q2 revenue of $701 million, up 7% year-over-year, with USDC in circulation rising 19% to $73.3 billion. Meanwhile, Ark bought SpaceX (SPCX) shares after they plunged 13.61% to $108.27, despite a 92% revenue jump to $7.8 billion in Q2, with investors concerned about a sixfold increase in capital expenditure to $18.4 billion.