25% now (which to be fair is only like 1.5c) - but looking on Sentieo there's nothing to see - no new public news, press releases, announcements, broker research (RBC at least covers ALC), etc since Apr 24th - yet...
Certainly trading like a big contract will be announced, or a takeover (like we have seen with many beaten-down companies which have all been taken out at relatively attractive prices - I have been at the receiving end of a few of those over the past 6-8 months).
They'd be treading on dangerous ground to say what they said there ("no idea boss!") ...and then announce a big contract or a takeover immediately afterwards.
More likely a microcap fund building a position, or a HNW individual or two accumulating a position.