Dark Pool — Trading Wiki

Publisher and editorial transparency

Published by TradeHQ. Site creator: Anuga Weerasinghe. This page has no recorded editorial review date; the About page explains the site's editorial approach.

What Dark Pool means

A non-displayed trading venue where orders generally do not appear in public pre-trade quotes. Not every off-exchange trade is a dark-pool trade.

In depth

A dark pool is a trading venue whose resting orders generally are not displayed in public pre-trade quotes. It differs from other off-exchange mechanisms such as broker internalisation, which may follow other rules. Non-displayed trading can reduce immediate information exposure, but fills still depend on liquidity, venue procedures and price conditions. Reporting rules vary by jurisdiction and instrument. A transaction marked 'off exchange' does not by itself prove it took place in a dark pool. For a study exercise, specify the reporting authority, market and period before comparing venue statistics.

A large reported transaction confirms an execution, not which participant was optimistic or what price will do next. TradeHQ does not model the operation of private trading venues.

Key points

• Non-displayed venues differ from public exchanges; access and trade sizes depend on venue rules
• Current venue shares require a dated market-data source; no percentage is asserted here
• May change execution exposure but does not eliminate market impact

Why it matters when you are learning

A reported off-exchange trade does not establish why a price moved or what the participants intended. Identify the venue, timestamp and reporting context before drawing conclusions.

Worked exercise and its limits

Separate pre-trade visibility from post-trade reporting. An undisplayed order is not proof that the executed trade will never be reported. Check venue rules rather than infer an institution's intention from an off-exchange print.