Here's what insiders bought in filings for Sep 24, 2021 — 24 companies and around $13.9 million in total. The biggest was MYOV (Myovant Sciences Ltd.), where Dainippon Sumitomo Pharma Co Ltd led about $3.1 million of buying.
Four of the buys came from a CEO or CFO. 86 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.