Dark liquidity describes liquidity that resides in venues where orders are not publicly visible prior to trade. In these venues, orders are hidden from the public quote book and executions can occur against other hidden orders. After execution, details may be partially disclosed, but pre-trade transparency is limited compared with lit markets.
Market participants, including institutions and broker-dealers, route portions of large orders to dark liquidity venues to access liquidity without revealing size or intent in the lit book. This can affect fill pricing and the visibility of trading activity, as some information remains confidential until after trade.
Dark liquidity is one component of market microstructure and can contribute to lower market impact for large orders but may also lead to fragmentation of liquidity and reduced price discovery at the public best bid and offer. Regulators monitor dark pools to balance pre-trade transparency with the need for efficient execution.
Common metrics include the share of total trading volume executed in dark venues and the percentage of trades that occur away from the lit order book. These figures can vary by asset class and market conditions.
In practice, a large institutional order might be routed to a dark pool to access non-displayed liquidity while other portions trade on lit venues.
Dark pool · Lit liquidity · Order book · Execution venue · Market microstructure · Pre-trade transparency