Dark Pool
Quick Definition
A private exchange where large block trades are executed anonymously, away from public order books.
Key Takeaways
- Dark pools let institutions trade large blocks anonymously to reduce market impact.
- They lack pre-trade transparency but must report trades after execution.
- Critics worry about fragmented liquidity and reduced price discovery on public exchanges.
What Is Dark Pool?
A dark pool is an alternative trading system (ATS) that allows institutional investors to trade large blocks of shares without displaying orders on public exchanges. The name "dark" refers to the lack of pre-trade transparency—order sizes and prices are hidden until after execution. Dark pools were created to minimize market impact: if a pension fund wants to sell 5 million shares on a lit exchange, the visible sell order could push the price down before the trade completes. By matching orders privately, dark pools reduce information leakage. However, critics argue that dark pools fragment liquidity, reduce price discovery on public exchanges, and can create conflicts of interest when broker-dealers run their own pools. The SEC requires dark pools to report trades post-execution, and regulations like Reg ATS govern their operations. Major dark pools include Crossfinder (Credit Suisse), Sigma X (Goldman Sachs), and POSIT (Virtu Financial).
Dark Pool Example
- 1A mutual fund used a dark pool to sell 2 million shares of Microsoft without moving the public price.
- 2Approximately 40% of U.S. equity volume trades off-exchange, including dark pools and wholesalers.
Related Terms
Block Trade
A privately negotiated, large-volume securities transaction that is executed outside the open market to minimize price impact.
Liquidity
The ease and speed with which an asset can be converted to cash without significantly affecting its market price.
Market Maker
A firm or individual that continuously quotes both buy and sell prices for a security, providing liquidity to the market.
Stock
A security representing ownership in a corporation, entitling the holder to a share of profits and voting rights.
Initial Public Offering (IPO)
The first sale of a company's stock to the public, transitioning it from private to publicly traded.
NASDAQ
The National Association of Securities Dealers Automated Quotations — the second-largest stock exchange globally, known for its concentration of technology and growth companies.
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