Replies to post #10529 on Protagenic Therapeutics Inc (PTIX)

[soupoftheday]

Operated by OTC Markets Group Inc. is a company that runs the website that invented OTCQB.

It's just a website.

Companies pay them to be in these tiers.

It's meaningless.

What exchange does ATRN trade on?

None.

It's a pinksheet.