MM's shorting this at 2.40 now so I suspect this has further to fall. I've seen this on a couple of stocks I hold recently with reasonable liquidity after good news, most notably GDR. AIM is no longer investor friendly. Its a traders market.
It appears that someone is hoovering up shares. Almost 1m shares were bought this week in multiples of 25k. It could be multiple buyers and a simple coincidence or again maybe not.