No link. What ever you have for a broker, should show the margin requirement. I have never known how they decide. Low priced stocks and OTC are 100% margin, meaning you can't borrow against it. NYSE stocks are usually 33% margin, so you can borrow up to 66 to 70% of it. PSFE should be 33% margin, I just don't know when.
Market Data 
Markets 
AI
