Here's what insiders bought in filings for Aug 3, 2021 — 40 companies and around $193.4 million in total. The biggest was RANI (Rani Therapeutics Holdings, Inc.), where Quiroga Moreno Isidoro led about $71.1 million of buying.
Six of the buys came from a CEO or CFO. Cluster buying (3+ insiders) is running at 69 companies this month. One buy doesn't make a thesis, but it's a good place to start digging.