Short selling is borrowing shares and selling them, hoping to buy them back cheaper later. It's how traders profit from falling prices. Understanding it helps you read sentiment indicators and recognize short squeeze setups.
1. Borrow shares from your broker.
2. Sell them at current price ($100).
3. Wait for price to fall.
4. Buy them back at lower price ($80) -- 'covering' the short.
5. Return shares to broker. Profit = $20 per share.
Risk: if price rises, losses are theoretically unlimited.
When a heavily shorted stock rises sharply, short sellers are forced to buy to limit losses -- driving the price even higher. This cascading effect is a 'short squeeze.'
GameStop (GME) in 2021 is the most famous example -- rose 1,700% in weeks as short sellers were squeezed by retail traders coordinating on Reddit.
Short Interest = shares sold short / total float.
> 20%: heavily shorted -- potential squeeze candidate if bullish catalyst arrives.
< 5%: lightly shorted -- market broadly agrees with the bullish thesis.
Days to Cover = shares short / avg daily volume.
> 5 days: squeeze potential is higher if stock moves against shorts.
Related: Bull Market vs Bear Market • Volume Analysis • Breakouts & Breakdowns