Investor education

Short Selling Explained

Short selling is a way to position for a fall in a security's price. Instead of buying low and selling high, a short seller sells first and aims to buy back later at a lower price. The mechanics involve borrowing shares, posting margin and paying ongoing costs, and the risk profile is very different from ordinary investing. This guide explains how shorting works in general terms and what to verify with a broker before attempting it.

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The mechanics: borrow, sell, buy back

In a conventional short sale, your broker locates and lends you shares, which you sell in the market at the current price. Later, you buy the same number of shares back, ideally at a lower price, and return them to the lender. Your gross profit or loss is the difference between the sale price and the repurchase price, before costs. Shorting requires a margin account because you owe shares rather than cash, and the broker requires collateral against the position. Availability of shares to borrow varies by security and over time; hard-to-borrow stocks can carry high borrowing fees or be unavailable to short at all.

You sell borrowed shares first and buy them back later to close the position.
A margin account and collateral are required to hold a short position.
Borrow availability and borrowing fees differ by stock and change over time.
Costs such as borrow fees and margin interest reduce any gain and add to any loss.

Why short selling risk is asymmetric

When you buy a stock, the most you can lose is what you paid. When you short a stock, losses grow as the price rises, and there is no ceiling on how high a price can go. This asymmetry is the defining risk of shorting. Sharp upward moves, sometimes amplified by many short sellers buying back at once, can force rapid losses. Brokers can issue margin calls requiring more collateral at short notice, and if you cannot meet one, positions may be closed at unfavourable prices. Lenders can also recall borrowed shares, forcing you to buy back regardless of the current price. Dividends paid while you are short are typically owed by you to the share lender.

Potential losses on a short position are not capped, unlike a long purchase.
Margin calls can force additional deposits or involuntary closing of positions.
Borrowed shares can be recalled, forcing a buy-back at an inconvenient time.
Short sellers generally owe any dividends paid on the borrowed shares.

What to verify with a broker before shorting

Rules and costs around short selling vary widely between brokers and jurisdictions, and some markets restrict or ban shorting of certain securities at certain times. Before opening a position, read the broker's margin agreement and short selling terms directly. Confirm margin requirements, how borrow fees are calculated and charged, how the broker handles recalls and forced buy-ins, and what happens during trading halts. Also check whether the account type you hold permits shorting at all. Unfamiliar terms can be checked against the Glossary at /glossary, the Education hub at /education has related guides on margin and order types, and the Find my broker workflow at /find-my-broker can help you structure this research.

Read the margin agreement and short selling terms before trading.
Confirm margin requirements, borrow fee calculation and billing frequency.
Ask how recalls, forced buy-ins and trading halts are handled.
Check local regulations, since shorting rules differ by market and can change.

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FAQ

How much can I lose on a short position?

There is no fixed ceiling. Because a stock's price can keep rising, losses on a short position can exceed the amount you initially received from the sale and can exceed your account deposit if margin terms allow. This is the key difference from buying shares, where losses are limited to the purchase amount.

Do I need a special account to short sell?

Short selling generally requires a margin account and broker approval, because you are borrowing shares and posting collateral. Requirements, eligibility and available securities differ by broker and jurisdiction, so verify the specific account terms in your broker's current documents.

What ongoing costs does a short position carry?

Typical costs include stock borrowing fees, margin interest where applicable, and payment of any dividends declared on the borrowed shares. Borrow fees vary by stock and can change while the position is open, so check how your broker calculates and charges them.