Short-selling is a way to try to profit from a price falling. You borrow an asset, sell it now, then aim to buy it back later at a lower price and return it to the lender.
In market slang this is taking a short position. It shows up across shares, indices, commodities, crypto and forex, either in the underlying market or through derivatives that mimic the payoff.
How a share short works, step by step
The classic example uses shares. The broker finds stock to lend, often from another client or a fund that is happy to earn a lending fee. The process typically runs like this:
- You ask your broker to short 100 shares of Company A. They locate the shares and confirm borrow is available.
- You sell 100 borrowed shares into the market at, say, £50. Cash from the sale sits in your account but is usually restricted as collateral.
- Days or weeks later, you buy 100 shares back. If you pay £42, you have a £8 per share trading gain before costs.
- You return the shares to the lender, closing the borrow.
Brokers hold margin against the position, since losses can grow if the price rises. If the price moves up far enough, you may be asked to post more cash or close the trade.
Costs, fees and what you owe while short
Shorts are not free to run. Common costs include:
- Borrow fee: a daily or annualised rate charged for the stock loan. Hard-to-borrow shares can be expensive.
- Financing: with margin or leveraged products you may pay overnight funding. Terms vary by provider and product.
- Dividends: if the company pays a dividend while you are short, you typically owe an equivalent amount to the lender or your broker, called a payment in lieu of dividend.
- Corporate actions: stock splits, rights issues and spin-offs are adjusted through the short. The economics aim to keep you flat to the action, but the mechanics differ by broker and clearing firm.
- Commission and spread: the usual trading costs on the opening sale and the closing purchase.
These charges mean the breakeven on a short drifts higher over time. A trade that looks profitable on price alone can turn into a small loss once fees and dividend obligations are included.
Where traders short in practice: cash, CFDs and futures
There are several routes to a short-selling payoff:
- Shorting the underlying shares: as described above, by borrowing and selling stock. This usually requires a margin account and access to a stock loan desk. Availability depends on borrow supply.
- Contracts for difference and spread bets: you enter a leveraged contract that mirrors the share price. No physical borrow is needed by you, but the provider will roll the economics through overnight funding and any borrow fees they face. Exact behaviour varies by provider.
- Futures: going short a futures contract gives a clean, centrally cleared short exposure without borrowing the underlying. Pricing embeds carry and expected dividends for equity index futures.
- Options: buying a put option can cap downside risk to the premium paid while still benefiting from a drop. Writing call options is another form of negative exposure but introduces its own margin and assignment risks.
In fast-moving assets like crypto, most retail shorting happens through derivatives rather than borrowing coins. Funding rates, collateral and liquidation rules vary by platform and can change.
What can go wrong: squeezes, recalls and margin calls
Short-selling carries risks that are different from buying:
- Price can rise without limit: a long can only fall to zero, but a short can, in theory, lose more than the initial stake. Strong risk controls are essential.
- Short squeeze: rapid rallies can force shorts to buy back shares to cut losses, pushing the price even higher and squeezing remaining shorts.
- Borrow recall or buy-in: the lender can ask for their shares back. If your broker cannot find a replacement, they may force you to close, sometimes at an awkward time.
- Hard-to-borrow premiums: fees can jump if demand for borrow spikes or supply dries up, eroding expected profits.
- Corporate news risk: takeovers, surprise earnings or regulatory approvals can gap a share price higher before you can react.
- Operational frictions: halts, suspensions and wide spreads can make covering difficult.
Rules on short-selling differ by country and can change, including locate requirements, reporting thresholds and temporary restrictions. Know the rulebook in your market and the specific policies of your broker. Crypto Daily does not provide brokerage or execution services.
Calculating P&L on a short position
The trading part is simple: sell high, buy back lower. Your gross trading result is the sale price minus the buyback price, multiplied by the number of units. Net profit and loss then subtracts fees and any payments in lieu of dividends.
Example:
- Short 100 shares at £50, later cover at £42. Gross trading gain is £8 per share, or £800.
- Borrow fee totals £60 for the holding period. Commission and spread costs add £20.
- The company pays a 50p dividend while you are short, so you owe £50.
Net P&L is £800 minus £60 minus £20 minus £50, which equals £670. If the cover price had been £55 instead, the gross trading loss would be £500 and costs would push the net loss beyond that.
Leverage makes percentage returns look larger, in either direction. Margin magnifies both gains and losses, and losses can exceed the cash you initially post if the price moves sharply higher.
Short-selling vs using alternatives
Shorting shares directly offers precise exposure and, when borrow is cheap and liquid, can be cost effective. The trade-off is uncapped risk, potential recalls and sensitivity to squeezes. A few common alternatives are worth weighing:
- Buying puts: puts rise in value as the underlying falls, with risk limited to the option premium. You face time decay and need the move before expiry, but you avoid borrow recalls.
- Short futures: clean linear exposure with central clearing and no dividend payments in lieu. You must manage margin and roll expiring contracts.
- Inverse or short ETPs: exchange traded products that deliver the opposite of an index’s daily return. These are convenient but the daily reset can cause path dependency, so long holding periods may diverge from a simple short.
- CFDs and spread bets: accessible for many retail traders in permitted jurisdictions, with simple trade tickets for long or short. Funding and spreads vary by provider, and losses can exceed deposits.
No route is universally best. Choice depends on availability, costs, time horizon and your tolerance for gap risk. For tax and regulatory treatment, rules vary by jurisdiction and can change.
Where you encounter short-selling day to day
You will see short interest data in company coverage, hear about shorts around earnings, and notice it in price action when crowded shorts rush to cover. In everyday trading, it appears as the sell side of your ticket when your platform offers a simple long or short selector. In more traditional set-ups you will request a borrow or receive an indication that the stock is easy or hard to borrow, with an estimated fee.
Shorts are also used as hedges. An investor long the sector might short an index future to trim exposure ahead of a binary event. A fund long one company can short a close peer to focus on the spread between them rather than the market’s overall direction.
Whatever the motive, the discipline is the same: know your entry, plan exits for both success and failure, track borrow and funding costs, and stay alert to news that could move the price against you.