Insider buyers were busy on Jan 15, 2021: 21 companies, $646.2 million in open-market purchases all told. The biggest was ARMT (Ameri Metro, Inc. (formerly Yellowwood)), where HSR LOGISTICS INC led about $629.1 million of buying.
Cluster buying (3+ insiders) is running at 72 companies this month. Nine 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.