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Market Structure
Opening Auction
Definition
The 10:00am AEST auction that sets ASX opening prices. Pre-open orders accumulate from 7:00am and the matching algorithm calculates a single clearing price. Short sales typically aren't permitted in the opening auction.
Related Terms
Market on Close
The 4:10pm AEST closing auction that sets official ASX closing prices. MOC orders execute only at the closing print and are widely used for benchmark trading and index rebalancing.
ASX Trade
The matching engine that runs continuous trading on the ASX and Cboe Australia (formerly Chi-X). Handles ~$5B in daily turnover during normal session hours 10:00–16:00 AEST.
See short selling in action
Explore real-time ASIC short position data for ASX stocks.