RE:Nil insider activity Insiders are participating through option grants. There are currently 7.5 million outstanding options that range in expiry from Oct 2021 to Apr 2025 (see financials on ACU website). Why buy in the open market when you can exercise options at an average price of 0.11? (actual exercise prices range from 0.06 - 0.265 with different quantities issued for each price, but average price is 0.11). The fact that management are not exercising options right now is a very good sign and good for shareholders. One because it'll prevent downward pressure on SP and further dilution at a time where a lot of great things are in the works, and two the fact that they are holding means that SP is likely going much higher. If they started exercising and selling in the open market right now, I'd be worried. But they aren't.
7.5 million options between the 4 main insiders (Gord Deans - who owns roughly 2.8 million common shares, John Mcnicol, Kevin Dodds, and David Toyoda). The options they have rights to obviously vary, but roughly speaking, 7.5 million divided by 4 is 1.875 million options each (again, yes I know the quantities held vary, just expressing it this way for simplicity).
So to answer your question, insiders are heavily participating. The fact that we haven't seen the exercise of the options as of yet is a great sign that SP has a lot of room to still grow here. Just my opinion.