Australia: ASX trading psychology

The ASX trades 10:00am to 4:00pm AEST, a session that's fully closed by the time European and US markets open. That means Australian traders routinely open into a gap reflecting a full overnight global news cycle they didn't get to react to gradually.

What tends to move it: Mining, energy, and banking dominate the index, so iron ore, gold, and oil prices, along with Chinese demand data, tend to move the ASX more than domestic headlines alone.

1. Overreacting to the opening gap. A resource-heavy index sitting closed while commodities move overnight means the ASX often gaps meaningfully at the open. The instinct to immediately close that gap with a large trade, rather than letting the first hour settle, is a common discipline break here specifically.
2. Ignoring Chinese economic data. China is Australia's largest trading partner for resources, and Chinese demand data or policy announcements can move ASX mining names more than any local news release.
3. Trading bank stocks without accounting for dividend timing. Australian banks are popular income holdings, and stocks often move mechanically around ex-dividend dates in ways that have nothing to do with the business itself.
4. Misjudging thin end-of-day liquidity. The ASX's relatively small market cap concentration in the top 20 names means liquidity can thin out meaningfully in smaller names near the close, amplifying normal-sized orders into outsized price moves.
5. Assuming Monday follows Friday's US close cleanly. Since the ASX closes before the US session and reopens after a weekend where US markets also moved, Monday's ASX open reflects two full sessions of unaddressed global news, not one.

• Check overnight commodity prices and the US close before trading the first hour of the ASX session.
• Track Chinese economic releases separately from Australian domestic data, they often matter more for resource names.
• Be extra deliberate about position sizing in smaller-cap ASX names during the last 30 minutes of the session.