Maximum Adverse Excursion (MAE) is the maximum unrealized loss (drawdown) that a trade suffers between its entry and its exit. Tracked within trading journals, MAE reveals how far price moved against a position during its lifetime, providing crucial empirical data to determine whether stop-loss boundaries are set too loose or entries are timed prematurely.
How it works
Peak drawdown measurement: For a long trade, MAE is calculated as the entry price minus the lowest price reached while the position remained open.
Stop placement audit: Plotting MAE across winning trades shows whether winners routinely retrace close to your stop or bounce immediately, highlighting potential stop-loss optimizations.
Entry timing diagnostics: Consistently large MAE across trades indicates chronic early entries and poor trade location.
Why it matters
Separates clean, immediate momentum entries from trades that endured agonizing, near-fatal drawdowns before reaching profit targets.
Provides mathematical evidence to calibrate stop distances based on actual market movement rather than arbitrary guesswork.
Helps traders avoid setting unnecessarily wide stops that ruin position sizing and risk-to-reward ratios.
A simple market example
You enter a long trade at $100 with an initial invalidation stop at $94 and eventually exit at your target of $112. While the position was active, price dipped to a low of $97.50 before reversing upward. The MAE for this trade was $2.50 ($100 - $97.50). Because price never breached $94, the position survived, and the MAE confirms your entry had comfortable buffer.
Common mistakes
Tightening stops strictly based on the smallest historical MAE, which creates curve-fitting and causes subsequent trades to be prematurely stopped out by routine noise.
Ignoring MAE on winning trades, falsely assuming that any trade that ended in profit must have featured flawless execution.
Failing to record the intraday low (or high for shorts) during the trade, which prevents accurate MAE calculation.
Frequently asked questions
What is the difference between MAE and Maximum Favorable Excursion (MFE)?
MAE measures the worst point of the trade (maximum open loss), while MFE measures the best point of the trade (maximum open profit before exit).
Can a stopped-out losing trade have an MAE larger than the initial stop?
Yes, if the trade experienced adverse slippage or an overnight gap past the stop price upon execution.
Why is MAE valuable for beginner journals?
It provides objective feedback on entry patience: if your winners routinely drop 2R into the red before recovering, you are entering too early and taking unnecessary stress.
Educational content only. Definitions describe common market usage and may vary by jurisdiction, instrument, or institution.