Filings for Sep 17, 2021 show insider purchases at 40 companies, adding up to roughly $124.7 million. TYRA topped the list with roughly $35 million, led by RA Capital Nexus Fund, L.P..
Seven of the buys came from a CEO or CFO. Cluster buying (3+ insiders) is running at 100 companies this month. One buy doesn't make a thesis, but it's a good place to start digging.