I talked to Mackey McFarlane from Spartan yesterday....he said they don't really have enough shares to be trading. They are trying to build up their customer base of clients holding PTEL, and he stressed several times that they were very early in the relationship.
They are still getting to know PTEL and where they want to go. He did say that they are working on an SB2 filing, but that they were a couple of months away from that.
I had also talked to him about a2a and their trading on the Plus markets. He said that it was possible fr a2a to get dual listings where they could trade on both the Plus exchange as well as the OTC market. I'd think that would be a good idea and make attracting US investors much easier.