Bound losses with MAE, stops, and drawdown limits

A three-layer loss budget

Editorial: read the archive workflow as three stacked checks. First use the winner-versus-loser split in maximum adverse excursion to justify a stop. Then audit platform syntax and cost fields so that bound is the one actually filled. Finally test the same dollar figure against a cash-management cap and an account drawdown limit before the trade is allowed to go on.

Justify the stop from the winner-loser split

Maximum adverse excursion is the largest dollar move against a position after entry, plotted across trades to see where winners and losers separate before a stop is chosen.

A review of per-trade maximum losses found only one eventual winner with more than $1,000 of adverse travel from entry, so that round level was chosen as the first stop.

The first coded rule was to exit if price reached more than $1,000 from the entry in the adverse direction. Adverse direction is price travel from the fill that reduces open equity, and it is the only direction that should trigger the stop.

After the cost fields were corrected, a plot of trade count versus adverse travel still split winners from losers near $1,000, and only one winner had gone more than $700 against the position.

Audit the bound that actually fills

A stop-loss is a precommitted exit that closes the trade if price reaches a fixed adverse distance from the entry fill.

The test language rejected a same-session stop-at-price instruction and required the exit to be written for a later session, which the blotter appeared to fill at the stop price.

Commission and slippage sat in more than one contract or data-header field. An incomplete edit left the reported stop about $400 wider than the intended $1,000 bound.

Chart review marked one brief whipsaw and one short that should have been stopped. Rerunning with the stop produced the missing exit and confirmed the rule was firing.

Test the same dollars against the account

A cash-management loss limit is a per-trade dollar ceiling the account is willing to spend, and it may be tighter than a convenient round stop.

A drawdown limit is an account-level peak-to-trough loss cap used to judge whether one-contract stop risk still fits the cash the desk will commit.

Moving the stop from $1,000 to the $700 cash-management loss limit converted one winner into a loser while cutting the remaining losses.

With the $1,000 stop, the largest single-trade loss was $1,101 and the worst drawdown was $2,606 against a $2,700 one-contract margin, still above the $700 cash-management cap.

Keeping exposure inside 2% of capital would have required committing more account funds rather than relying on the stop alone.