Here's what insiders bought in filings for Aug 16, 2021 — 40 companies and around $60.5 million in total. The biggest was CLYM (Eliem Therapeutics, Inc.), where RA Capital Nexus Fund II, L.P. led about $50 million of buying.
92 companies had three or more insiders buying in the past 30 days. C-suite buying: seven companies. One buy doesn't make a thesis, but it's a good place to start digging.