What Is a Busted Trade?
Most trades that execute are permanent the instant they fill. Every so often, though, an exchange steps in afterward and cancels one entirely, as though it never happened — an outcome traders call a busted trade.
The short answer
A busted trade is a completed trade that an exchange voids after the fact, usually because it executed at a price so far removed from the surrounding market that letting it stand would be unfair or clearly the result of an error. Once a trade is busted, it’s erased from the record: the shares and cash are unwound, and both sides of the trade are treated as if it never occurred.
What usually triggers one
Exchanges generally look at how far a trade’s price deviated from where the security was trading just before and after the execution. A trade that fills wildly outside that recent range — often the result of an order entered with a typo, a malfunctioning trading algorithm, or a very thin market with almost no buyers or sellers present — is a candidate for review. This kind of extreme, fast price move is also part of why mechanisms like market-wide circuit breakers exist, since a cluster of erroneous or panicked trades can distort a whole session, not just one order. The exact thresholds and review process for busting a trade are set by exchange rules that can be updated over time, so the specific criteria are best confirmed with current exchange guidance rather than treated as fixed.
How it differs from a trade correction
A trade correction fixes a detail of a trade that still stands, such as an incorrect share count. Busting a trade is more drastic — the entire transaction is voided, not adjusted. Exchanges tend to reserve busts for cases where the price itself was so clearly wrong that no adjustment could reasonably fix it; anything less severe is more likely handled as a correction instead.
What happens to your account
If a trade someone placed gets busted, the position and cash impact are reversed, and the account is returned to roughly where it stood before the trade executed. Any order that was pending to buy or sell based on that now-voided trade may also need to be reassessed. This can be disorienting if it happens during a fast-moving session, particularly one involving a broader trading halt or unusual volatility, since a busted trade in that environment is often one of several unusual events happening close together.
Why this exists at all
The rules around busting trades exist to protect market integrity when something has clearly gone wrong mechanically, rather than to let anyone unwind a trade simply because the price moved against them afterward. An investor who buys a stock and watches the price drop normally afterward has no claim to a bust — that’s just market risk. A bust is reserved for cases the exchange determines involved an execution error, not a bad but legitimate outcome.
The bottom line
A busted trade is a rare, exchange-driven event rather than something an individual investor can request. Recognizing the difference between an unwanted-but-valid trade and one that gets formally busted helps set realistic expectations: if a fill looks far outside where a security has been trading, it may eventually be reviewed, but a trade that executed at a normal, if disappointing, price is going to stand as-is.