Question: Where can I find a list of the amount shares traded on margin per company? 

Answer: I don't think you will find shares traded on margin as a category. \n\nShort sales are listed in Barron's, which is an excellent source for data and ideas. Stock is shorted only in a margin account.\n\nFutures on stocks are also traded only in a margin account. \n\nYour question doesn't make a lot of sense, and you don't say why you're asking it. \n\n"Margin per company?"  Do you mean per brokerage? Do you mean per stock? Do you mean per exchange?\n\nI can't imagine, even if you were able to obtain this info, how this would be beneficial to you, or to anyone to answer it for you.\n\nYou have to ask a valid question before you get an answer
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