40 companies had insiders buying in open-market trades in filings dated Jun 17, 2021, about $114.1 million combined. At the top: RIG, $41.8 million bought, with Perestroika as the largest buyer.
C-suite buying: ten companies. 97 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.