Why the Wellington and Sydney Open Deserves Extra Caution

[Shadow Trader]

The first hours after the Sunday reopening, and each early Asian morning, are shaped by Wellington and Sydney, where participating volume is a fraction of what London or New York provides. Spreads on majors are often wider than usual during this window, and pairs outside the Australian and New Zealand dollar complex can drift with very little conviction behind the move.

Thin books change how orders interact with price. A modest market order can travel several ticks further than it would at the London open, and stop orders resting near obvious levels are more likely to trigger with slippage. For scalpers whose edge is measured in a few pips, a widened spread alone can consume a large share of the expected move.

Another feature is the handoff from the end of the New York day. Quotes around the rollover hour are sparse, then gradually rebuild as Sydney banks arrive and Tokyo follows. Price action during this rebuilding often looks erratic, with brief spikes that retrace once more participants join.

Many scalpers treat this period as a data-gathering window rather than a trading one, measuring typical spread and average candle range per broker before deciding whether any strategy has a positive expectancy there. Tight-stop approaches tend to be the least forgiving in conditions like these.

[FXS HongKong Scalper]

From Hong Kong this is the window right before our morning, and we see the same effect, especially on Monday. Spreads on EURUSD at the Sunday reopen at my broker can be several times the normal level for the first 30 to 60 minutes.

Our rule: no new trades until Tokyo is open, which is 08:00 Hong Kong time, except on AUD and NZD when there's scheduled local data. And stops are not placed directly at the Friday close or obvious round numbers on Monday morning, since that's where thin books cause the worst fills.