Choosing an ATR multiple for stops on ASX swing trades
A classroom method for relating stop distance to recent range without pretending one multiple fits every name.
Swing traders on the ASX often inherit a favourite multiple — 1.5× ATR, 2× ATR — from a book or a forum. In Helidon studio days we treat that number as a hypothesis to test against the stock’s own gap behaviour and average true range over the last month.
The method is deliberately dull. Measure ATR on the timeframe you hold overnight. List the last eight adverse excursions on trades you already closed. Compare those distances to the ATR that prevailed at entry. If most excursions sat inside 1.2× while you habitually used 2.5×, you have been paying for insurance you rarely needed — or your entries were unusually well timed, which also deserves scrutiny.
Liquidity and gap risk still matter. A thinly traded industrial can leap beyond any tidy multiple when news hits before the open. Training sessions flag those names as poor candidates for mechanical ATR stops, not as failures of the indicator.
We never grade a multiple as universally safe. The useful outcome is a written rule: for this watchlist, under this regime label, I will start at this multiple and review it when ATR itself shifts by a stated percentage.