In relation to your thinking about the offloading of shares, perhaps a few major shareholders were looking to risk manage or offload some capital gains with some capital losses - who knows? We can only work with the here and now. Or with what's coming in the future.
Speaking of which, a few of those milestones that you mention may not be up and done by the April result as you've noted (let's hope that they are to show that the company is well on track), as per the details discussed here:
A personalised tool to help users track selected stocks. Delivering real-time notifications on price updates, announcements, and performance stats on each to help make informed investment decisions.
(20min delay)