POET Technologies Inc.

Checking the daily Vancouver Sun in the morning, about a week ago, showed Poet Tech as part of the listing. This week, the listing for Poet dropped/was missing. Considering it gained a fair amount, percentage-wise, was expecting to see it in the "winners circle" of stocks that performed extremely well that day/week. No listing.

I know they haven't changed their name/listing. What reason would there be to drop a listing off the TSX list/Venture list?