Trading term
What is Short selling?
Short selling means borrowing shares you don't own, selling them at today's price, and buying them back later to return to the lender. If the price falls, you buy back cheaper and keep the difference. If it rises, you still have to buy back, and the loss has no ceiling, because the share price has no ceiling.
The order is what makes it strange: sell first, buy back later. Your broker borrows shares from another investor and lends them to you, you sell them at today's price, and the cash lands in your account as collateral, not spending money. Later — a day, a month, whenever — you buy the same number of shares back and return them to the lender. If the price dropped in between, buying back costs less than you sold for, and you keep the gap. It's not a derivative — there's no contract standing in for the stock. You're borrowing and selling the actual shares.
That's also why the risk is lopsided in a way buying isn't. Buy a stock and the most you can lose is what you paid, because a share price stops at zero. Short a stock and there's no equivalent floor on the other side — the price you'll eventually pay to buy back has no upper limit. You also need a margin account to do it, since the broker wants collateral beyond your sale proceeds, and a margin call can force you out before your view on the company ever gets the chance to play out.
For example
You borrow 100 shares trading at $80 and sell them for $8,000. The stock falls to $60, so buying 100 shares back costs $6,000. You return them and keep the $2,000 left over. Had the stock risen to $120 instead, buying the 100 shares back would have cost $12,000 — a $4,000 loss, on a trade where you never touched more than $8,000 of stock.
Go hands-on in Premium
That's Short selling in theory — it clicks when you read it on a live chart. Practise it hands-on in the TradeWize Premium Futures & Derivatives track.
Explore Premium →Why it matters to you
Short selling is the direct way to profit from a falling price, rather than doing it through an option or a futures contract. It's also how short sellers get paid for finding problems in a company before anyone else does — several large frauds were exposed by short sellers first. But the uncapped loss, the borrow fee, and the margin call that can end the trade early make it a fundamentally different risk than buying shares.
⚠ The loss isn't just bigger — it grows as it goes wrong
A losing long position shrinks: the money at risk falls as the price falls. A losing short grows: as the price rises, the shares you owe cost more to replace, so your exposure gets bigger exactly when it's going against you. Nobody increased your position for that to happen — the mechanics of owing shares instead of owning them did it automatically.