My personal thesis on the matter is that a decent size shareholder needs to raise cash. They cannot liquidate all at once (due to the obvious share drop) therefore they are selling in and around .45 with .45 the low water mark. It goes without saying that it is in thier best interest not to trail the stock down as it limits thier ability to sell further at (relatively speaking) acceptable prices to them.
This is where we are at right now. POET is a tightly held security with lower volume. One entity can have at it for a while-while we watch. I would not think too much about it. It should/will not affect the future buyout value of POET as that will be predicated on multiple purchaser competition (this is goal).
In the meantime, we just need this person(s) to run out of shares.