Filings for Mar 23, 2023 show insider purchases at 39 companies, adding up to roughly $70.4 million. The biggest was SWX (Southwest Gas Holdings, Inc.), where ICAHN CARL C led about $31.6 million of buying.
C-suite buying: 14 companies. 132 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.