40 companies had company insiders buying with their own money in filings dated Aug 19, 2021, about $56.2 million combined. The biggest was APMIU (AxonPrime Infrastructure Acquisition Cor), where Prime Infrastructure Sponsor LLC led about $15 million of buying.
120 companies had three or more insiders buying in the past 30 days. C-suite buying: 13 companies. One buy doesn't make a thesis, but it's a good place to start digging.