Is there a time limit to cover an open short position? [duplicate]
There are situations where you can be forced to cover a position, particular when "Reg SHO" ("regulation sho") is activated. Reg SHO is intended to make naked short sellers cover their position, it is to prevent abusive failure to delivers, where someone goes short without borrowing someone else's shares. Naked shorting isn't a violation of federal securities laws but it becomes an accounting problem when multiple people have claims to the same underlying assets. (I've seen companies that had 120% of their shares sold short, too funny, FWIW the market was correct as the company was worth nothing.) You can be naked short without knowing it. So there can be times when you will be forced to cover. Other people being forced to cover can result in a short squeeze. A risk. The other downside is that you have to pay interest on your borrowings. You also have to pay the dividends to the owner of the shares, if applicable. In shorter time frames these are negligible, but in longer time frames, such as closer to a year or longer, these really add up. Let alone the costs of the market going in the opposite direction, and the commissions.