Here is Rainer's excellent post from today:
Remaining warrants/options
Remaining in September are now at most 4,427,000 warrants und 3,971,300 options – and likely considerably less than that. 850,000 of these options are out of the money at present. They will be exercised only if the share price rises above 1.21/1.24 CAD until 2015-09-30.
After that the overhang will be gone for some time. The next important date is 2016-02-12 when 6,734,577 warrants will come due. At a strike price of 0.91 CAD they'll bring 6,128,465.07 CAD into POET's coffer.