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A twilight pool is a liquidity venue that is essentially dark, but which illuminates certain elements of information regarding market activity for periods at certain times of day or under specific circumstances, generally for the purpose of attracting more liquidity at those times and matching buyers and sellers. Think of it as speed dating for market participants, but only under semi-lit conditions.
The great thing about twilight pools is that they maintain the advantages of dark pools while still offering some of the benefits of lit venues.
Dark pools of liquidity serve an important purpose in that they enable investment firms to shift large quantities without “showing their hand” and opening themselves up to the possibility of adverse price movements, which is often what happens when they try to execute large transactions on a fully lit venue.
However, the disadvantage of dark pools is that firms generally have no idea what might be in the pool before they go in. They cannot see existing bids or offers, or event the amount of trading that is occurring. There is no visible indication of liquidity at any particular point in time. Whereas a twilight pool allows all of the anonymity of dark pools to be maintained, while illuminating aspects of the market during key periods, in effect offering the best of both worlds.
By controlling the levels of transparency or opacity that market operators are applying to the market at any point in time and being able to focus trading activity at specific times of day, dark pools offering this kind of “speed dating by candlelight” capability are attracting liquidity from previously untapped sources. And in the new world of fragmented markets, the ability to attract and keep liquidity is essential for any trading venue.