Most new traders only know how to make money when price goes up — which means they sit on their hands, or force bad longs, through every downtrend. Learning to go short doubles the market you can trade: you profit when price falls, not just when it rises.
The idea sounds backwards at first, so let’s make it concrete.
Long vs short in one picture
Going long is the familiar direction: buy low, sell high, pocket the difference. You want price to rise after you enter.
Going short is the same trade run in reverse order: you sell high first, then buy back low, and pocket that difference instead. You want price to fall after you enter. The profit logic is identical — buy low and sell high — you’ve just flipped which one happens first. A short is simply a bet that the thing you’re trading is worth less soon than it is right now.
Everything else about a short trade behaves like a long in mirror image: your stop-loss sits above your entry (price rising is what proves a short wrong), and your take-profit sits below.
The mechanics of selling first
“How do I sell something I don’t own?” is the honest question, and the answer depends on what you’re trading.
In traditional stock trading, a short works by borrowing. Your broker lends you shares, you sell them at the current price, and you’re now obligated to return those shares later. To do that you buy them back — ideally cheaper than you sold. The gap between your sell price and your later buy price is your profit (or loss). Because you borrowed, you’ll typically pay a borrow fee for holding the position, and hard-to-borrow names can be expensive or unavailable.
That borrowing machinery is why shorting stocks feels fiddly. The good news for most prop traders is that the instruments they actually trade — futures and CFDs — skip the borrow entirely, which we’ll get to.
Why short risk is theoretically unlimited
Here’s the asymmetry you must respect: a long and a short do not carry the same shape of risk.
When you’re long, the worst case is that price goes to zero — you can lose your entire stake, but no more. Your downside is capped because price can’t fall below nothing.
When you’re short, the math inverts. Your profit is capped (price can only fall to zero), but your loss has no ceiling — because there’s no upper limit on how high price can climb. If you short and the market rips upward, your loss grows with it, and a violent squeeze can move against a short far faster than a normal decline moves in its favor. This is why “short risk is theoretically unlimited” is more than a textbook line: it changes how carefully you have to size and stop.
The practical defense is the same as always but non-negotiable on shorts: a hard stop-loss above your entry, and size chosen so that even a sharp adverse spike stays within your risk budget. Never short without a stop.
Shorting futures and CFDs: no borrow needed
For prop traders, shorting is usually far simpler than the stock version, because futures and CFDs are natively two-sided.
A futures contract is just an agreement to transact at a set price later — so selling one to open is exactly as ordinary as buying one to open. There’s no share to borrow, no borrow fee, no locate. Going short an index or commodity future is a single click, mechanically identical to going long. CFDs work the same way: you open a sell position directly, with no borrowing step. Whether you trade through MT5 or a futures platform, opening a short is symmetric with opening a long.
This is a big part of why futures-based prop evaluations are popular with traders who want to work both directions of a trend. Firms differ on exactly what’s allowed — some restrict certain instruments or holding windows — so confirm the specifics of any program, like E8 Markets, directly with the firm before you build a strategy around shorting.
Sizing a short so the asymmetry can’t hurt you
Because the loss on a short is open-ended, sizing discipline matters even more than it does on a long. The method doesn’t change — it just leaves zero room for improvisation:
- Set the stop first, above structure — beyond the swing high or range top that would prove your short wrong. That distance is your risk per unit.
- Size to a fixed risk, not to conviction. Feed the stop distance into a position size calculator so a normal adverse move costs a known, bounded amount no matter how far the eventual squeeze runs.
- Check the reward is worth it. A risk/reward calculator tells you whether the fall you’re targeting justifies the risk above your entry — shorts into strong uptrends often don’t.
- Respect gap and squeeze risk. Overnight and news-driven jumps hit shorts harder; keep size smaller when those events loom, and know your firm’s holding rules.
The through-line is that a short is a perfectly good trade with an unforgiving tail. The traders who short safely are the ones who’ve made their downside a fixed number before entering — and who let a hard, broker-side limit hold that number when a fast market tempts them to “give it room.” Shibiki enforces that limit and auto-journals every short with its stop and resulting R, so the asymmetry stays in the math instead of in your account.
Related: position size calculator · risk/reward calculator · MT5 integration