Insider buyers were busy on Oct 18, 2023: 29 companies, $523.7 million in open-market purchases all told. The biggest was CERE (Cerevel Therapeutics Holdings, Inc.), where Koppel Adam led about $375 million of buying.
Three of the buys came from a CEO or CFO. 50 companies had three or more insiders buying in the past 30 days. One buy doesn't make a thesis, but it's a good place to start digging.