Doesn't mean Pinetree has no more POET shares, because according to http://www.pinetreecapital.com/investments/disclosure_criteria/ they are listing only those investments where they are reporting insider.
Please also note that the date of http://www.pinetreecapital.com/investments/investees_name/ is June 30th, not July 31th. Pinetree ceased to be a reporting insider on April 16th, so this is no surprise.
We don't know how many POET shares Pinetree has left, but for sure this selling is temporary and does not affect the company POET Technologies at all.