Here's what insiders bought in filings for May 4, 2021 — 40 companies and around $71.1 million in total. The biggest was HOWL (Werewolf Therapeutics, Inc.), where Flynn James E led about $47.2 million of buying.
Ten of the buys came from a CEO or CFO. Cluster buying (3+ insiders) is running at 50 companies this month. Each filing is linked below if you want to check the details yourself.