40 companies had the people running the company buying in open-market trades in filings dated May 12, 2022, about $238.3 million combined. The biggest was OXY (OCCIDENTAL PETROLEUM CORP /DE/), where BERKSHIRE HATHAWAY INC led about $51.7 million of buying.
111 companies had three or more insiders buying in the past 30 days. Six of the buys came from a CEO or CFO. One buy doesn't make a thesis, but it's a good place to start digging.