RE:Tilray insiders buying Irwin bought only 50k shares, and this marks his first purchase ever. The 2 million shares he owns is the remaining balance of the millions of shares he was previously awarded (RSU's, PSU's & Synergy PSU's).
Mrs. Merton bought 10k shares in the hope of easing Carl's night terrors.
I am not short because the Tilray gurus think they can defy gravity if they all jump at once. They might be right, for a second or two.