Derivatives and advanced market conceptsModule 2, lesson 9 of 21
Short selling
Selling first and buying later, intraday shorts, securities lending and short futures, why short sellers' losses are not capped, and how short squeezes happen.
In this lesson
- Explain how a short sale makes money when prices fall.
- Describe the main ways to take a short position in Indian markets.
- Calculate a short seller's loss when the price rises, and explain why it has no fixed limit.
- Explain how a short squeeze happens.
Builds on
- Leverage and marginShort positions are usually leveraged and need margin.
On this page
In simple terms
Normally investors buy first and sell later, hoping the price rises. Short selling reverses the order: sell first, then buy back later, hoping the price falls. The profit is the difference between the sale price and the lower buy-back price.
Short sellers play a useful role in markets: they can bring negative information into prices and sometimes expose fraud. But for individuals, short selling carries special risks.
How it works
Worked example: A made-up short sale
A trader sells 100 shares at ₹500, without owning them, and later buys them back.
| Buy-back price | Result |
|---|---|
| ₹400 | +₹10,000 |
| ₹500 | ₹0 |
| ₹600 | −₹10,000 |
| ₹1,000 | −₹50,000 |
| ₹1,500 | −₹1,00,000 |
| Sale value: 100 × 500 | ₹50,000 |
|---|---|
| Loss if bought back at ₹1,500: 100 × (500 − 1,500) | −₹1,00,000 |
| Loss as a share of sale value | 200% |
Ways to go short in India
- Intraday in the cash market: sell shares you do not own and buy them back the same day. If the position is not closed, settlement problems and penalties can follow, under exchange rules.
- Short futures: sell a futures contract, which gains when the price falls, as the futures lesson explains.
- Securities lending and borrowing: borrow shares from a lender for a period, paying a fee, then sell them and return them later.
- Buying puts: gains when prices fall, with the loss limited to the premium, as the calls and puts lesson explains.
Which methods are available, for which shares and on what terms, is set by SEBI and the exchanges and changes over time.
Why losses have no fixed limit
| Long position | Short position | |
|---|---|---|
| Best case | Price rises without limit | Price falls to zero |
| Maximum gain | No fixed limit | 100% of the sale value |
| Maximum loss | 100% if the price falls to zero | No fixed limit as the price rises |
A share can only fall to zero, but it can rise much more than 100%. Combined with leverage, a short position can lose many times the margin put up, as the leverage lesson explains.
Short squeezes
When a heavily shorted share starts to rise, short sellers face growing losses and margin calls. Many buy back to limit losses, and their buying pushes the price higher, forcing more short sellers to buy back. This feedback loop is a short squeeze. Prices can rise far beyond any business reason in days, as the herding lesson's discussion of crowd behaviour suggests.
Other costs and risks
- Borrowing fees for borrowed shares.
- Dividends and corporate actions: the short seller usually has to compensate the lender.
- Recall risk: the lender may want shares back at an inconvenient time.
- Gaps: good news overnight can open the price far higher, as the gaps lesson explains.
- Timing: a short seller can be right about a company's problems but lose money if the price rises first.
Why it matters
Short selling shows clearly why the shape of a position's risk matters: limited gains with unlimited losses is a dangerous combination, especially with leverage. Understanding it also helps make sense of market events such as squeezes.
Limitations
The examples ignore costs, fees and margin details, which are set by exchanges and brokers and change over time. Regulatory rules on short selling differ between markets and can change, especially during crises.
Common mistakes
- Thinking a short's loss is capped like a long's.
- Shorting popular, heavily shorted shares without considering a squeeze.
- Ignoring borrowing costs and dividends.
- Being right too early, with too much leverage to wait.
Try it yourself
- For a made-up short of 200 shares at ₹250, calculate the result at buy-back prices of ₹200, ₹300, ₹500 and ₹750.
- Compare the maximum gain with the loss at ₹750.
- Explain in your own words why a short squeeze feeds on itself.
Key takeaways
- Short selling means selling first and buying back later, hoping to buy back at a lower price.
- In India, shorts can be taken within a day in the cash market, through short futures, or by borrowing shares through a securities lending and borrowing system. Rules for each are set by SEBI and the exchanges.
- A long position can lose at most 100% when a price falls to zero. A short position's loss grows as the price rises, with no fixed limit.
- A short squeeze happens when rising prices force short sellers to buy back, pushing prices higher still.
- Short positions also face margin calls, borrowing costs, and the risk that dividends or corporate actions must be paid to the lender.
Check your understanding
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Terms used in this lesson
- Short selling
- Selling first and buying back later, aiming to profit from a fall in price.
- Short squeeze
- A rapid price rise driven by short sellers buying back to limit their losses, which pushes the price higher still.
- Securities lending and borrowing
- A system for borrowing shares from their owners for a period, for a fee, often used to sell short.
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This lesson is general education, not investment advice. Examples use made-up or clearly dated figures to explain ideas; they are not recommendations. Read the disclaimer.