When opening an account for margin financing and securities lending, you can use your own securities account to find a securities company. However, it should be noted that many securities companies do not have the source of securities lending, and you cannot short an account without the source of securities lending. Only one margin account can be opened under an individual's name, so be cautious.

Personally, if you want to short, you can open a financial futures account to do stock index futures. This is a two-way transaction, and you can also hedge your stock.