What Is Short Selling and How Does It Work?

Beginner-friendly Updated June 2026

What Is Short Selling?

Normally when you invest, you buy low and hope to sell high — this is called going "long." Short selling (or "shorting") flips that idea around: you try to make money when a stock's price goes down.

Here is the core idea. You borrow shares from someone who owns them (through your broker), sell them immediately at the current market price, and hold the cash. Later, you buy the same number of shares back — hopefully at a lower price — and return them to the lender. The gap between what you sold for and what you bought back for is your profit. If the price rises instead, you lose money.

If you are new to how owning shares works, start with what is a stock (share) and how the stock market works before going further.

A Simple Example

Imagine a share trades at PKR 200 and you believe the price will fall. You borrow 100 shares and sell them, receiving PKR 20,000. A week later the price drops to PKR 150. You buy 100 shares back for PKR 15,000 and return them to the lender. Your gross profit is PKR 5,000 — before fees and the cost of borrowing the shares.

But notice the catch: if instead the price had risen to PKR 250, buying back 100 shares would cost you PKR 25,000, and you would lose PKR 5,000. And the price could keep climbing with no fixed ceiling. This is the mirror image of how you normally make money from stocks — and a much riskier one.

Why Short Selling Is So Risky

When you buy a stock, the worst case is it goes to zero — you lose 100% of what you put in, and no more. Short selling is different and far more dangerous:

• Losses can be unlimited. A stock you shorted at PKR 200 can climb to PKR 400, PKR 600, or higher. There is no upper ceiling on a share price, so there is no fixed limit on your loss.
• Borrowing has a cost. You pay a fee to borrow the shares, and the lender can demand them back early (a "recall"), forcing you to close the position at a bad time.
• A "short squeeze" can wipe you out. If many short sellers rush to buy back at once, the price spikes sharply, magnifying losses for everyone still short.
• It usually relies on borrowed money (margin), which typically involves riba (interest).

For most beginners, shorting belongs in the same bucket as common beginner mistakes. Sound long-term wealth tends to come from compounding and diversification, not from betting against companies.

Can You Short Sell on the PSX or US Markets?

On the Pakistan Stock Exchange (PSX), short selling does exist but is tightly regulated by the SECP (Securities and Exchange Commission of Pakistan) and the exchange. It is restricted to eligible securities, requires margin arrangements, and is mainly used by sophisticated traders — not a tool ordinary retail investors typically reach for. The rules around eligible scrips, margin, and which short-selling mechanisms are allowed can change, so always confirm the current SECP and PSX framework with your broker. To learn how the two markets compare, see PSX vs US stock market.

In the US market, shorting is more accessible to local investors, but as a Pakistani investor your access to US stocks is itself limited. Many non-resident Pakistanis invest through a Roshan Digital Account (RDA), and others use international brokers — but these channels are generally set up for long-only investing, and short selling needs a margin account that most basic platforms do not offer to overseas retail clients. See how to invest in US stocks from Pakistan.

On taxes: any gains you realize on PSX shares are subject to capital-gains tax (CGT), generally collected through your broker and deposited with the FBR. The rate is set in each year's Finance Act and can vary by holding period and by whether you are an active taxpayer (filer), so check the current rate rather than assuming a fixed number. Read capital-gains tax on PSX stocks for details.

Is Short Selling Halal?

This is general education, not a fatwa — for your own situation, consult a qualified scholar. With that said, many contemporary scholars and Islamic finance bodies hold that conventional short selling is not permissible. The usual objections are that you sell something you do not own and have not taken possession of, that the trade typically depends on interest-based margin borrowing (riba), and that it carries excessive gharar (uncertainty) and resembles speculation. Standards from bodies such as AAOIFI are often cited in support of this view, though scholars do discuss narrow, specially structured alternatives, and opinions are not uniform.

Because of these concerns, many Muslim beginners are better served by long-term, Sharia-screened ownership rather than shorting. Explore what is halal investing, what makes a stock halal, and is day trading halal to build a strategy you are comfortable with.

Key takeaways

• Short selling means borrowing shares, selling them now, and buying them back later: you profit only if the price falls, and lose if it rises.
• Unlike normal investing (where the most you can lose is 100%), losses from shorting have no fixed limit because a share price has no upper ceiling.
• On the PSX, short selling is tightly regulated by the SECP, limited to eligible securities, and used mainly by sophisticated traders, not ordinary retail investors.
• Pakistani access to US stocks (often via a Roshan Digital Account or an international broker) is usually set up for long-only investing and rarely supports shorting.
• Many scholars and bodies such as AAOIFI hold that conventional short selling is impermissible due to selling what you don't own, riba on margin, and excessive uncertainty (gharar), but this is education, not a fatwa.

Frequently asked questions

How is short selling different from normal investing?

Normal ('long') investing means buying a share and hoping it rises. Short selling is the opposite: you borrow and sell a share you don't own, hoping to buy it back cheaper later. With long investing your loss is capped at 100% of what you put in, but a short sale's losses have no fixed limit if the price keeps rising.

Can a beginner short sell on the PSX?

In practice, it isn't a beginner tool. Short selling on the PSX is permitted only on eligible securities under strict SECP and exchange rules, requires margin arrangements, and is used mostly by sophisticated traders. Always check the current framework with your broker before assuming it is available to you.

What is a short squeeze?

A short squeeze happens when a heavily shorted stock starts rising and many short sellers rush to buy shares back at once to limit their losses. That wave of buying pushes the price up even faster, causing rapid, large losses for those still short.

Is short selling halal in Islam?

This is educational, not a fatwa. Many scholars and bodies such as AAOIFI hold that conventional short selling is impermissible, because you sell what you don't own, it usually involves interest-based margin (riba), and it carries excessive uncertainty (gharar). Opinions are not uniform, so consult a qualified scholar for your case.

Do I pay tax on short-selling gains in Pakistan?

Any realized gains on PSX shares are subject to capital-gains tax, usually collected through your broker for the FBR. The rate is set each year in the Finance Act and can depend on holding period and filer status, so verify the current rate rather than assuming a fixed number.

Keep learning

• How Do You Make Money From Stocks?
• PSX vs US Stock Market: What's the Difference?
• Is Day Trading Halal? An Islamic View for Beginners
• What Is Riba (Interest) in Islam and Why It's Forbidden
• Common Beginner Investing Mistakes to Avoid

Educational only — not financial advice.