There will be buy backs on loans from borrowed shares! This means loans on borrowed shares need to be bought back at a premium since banks are at positive catalyst, which means buy backs on premiums with shorted shares have an influx and now hedgies cant stall no more, their time is up! Thats when the margin call happens and Hedgies need to cover the margin when the shares drop 30%. In addition, your stock borrow will be subject to interest rates set by the brokerage. Interest rates typically vary depending on the volatility and scarcity of the stock being borrowed, as discussed above. Finally, you are also responsible for paying back any dividends that are paid out while you are holding the shares. The brokerage will then pay these dividends out to the original owner of the stock from whom the shares were borrowed.