A short sale occurs when an investor sells a stock they don’t own to hopefully buy it back later at a reduced price. Recently, Gamestop and AMC have seen a short squeeze. When you short a stock, if the stock price increases, you must make a margin deposit, that is, make an additional deposit of cash into your account, or repurchase the stock and take the loss. In a short squeeze, a group of investors buy the stock, forcing short sellers to make more deposits or take a loss. In the past two weeks, Gamestop has gained about 1,800 percent, which in our opinion, means the stock is in a bubble.