
Photo by N. Richie
Trading volume is down for the New York Stock Exchange (NYSE) and the Nasdaq. Both exchanges are losing market share to off-exchange trading. According to Bloomberg Businessweek (Matthew Philips, May 10, 2012):
Both exchange companies are contending with similar forces: an overall slowdown in trading, the rise of smaller public exchanges such as BATS and Direct Edge, and the increasing number of trades being executed “off exchange”—either at wholesale brokerages or on private trading venues known as dark pools. Since January 2008 the share of trades executed off public exchanges has increased, to 32 percent from 26 percent, according to market research firm Tabb Group. Nasdaq and NYSE “are getting a smaller bite of a shrinking pie,” says Sang Lee, an analyst at Aite Group.
Dark pools of liquidity are one example of “off exchange” trading that is taking market share away from traditional exchanges. According to the SEC factsheet (October 21 2009)
When investors place an order to buy or sell on an exchange, the exchange typically makes that order available for the public to view. With some dark pools, however, investors are able to signal that they have an interest in either buying or selling a security. But that so-called indication of interest (IOI) is communicated only to a subset of market participants.
That means that investors operating with the dark pool have access to information about a potential trade that other investors using public quotations do not. As a result, dark pool participants are able to have their orders filled, while those on publicly displayed markets go unfilled, even though dark pools use the information from publicly displayed markets to price the dark pool transactions. When dark pools share information about their trading interest with other dark pools, they can function like private networks that exclude the public investor.
(Read the full SEC factsheet “Strengthening the Regulation of Dark Pools” here)
For discussion:
· What is the difference between an over-the-counter (OTC) and an exchange-traded market?
· What are the benefits and limitations of each?
· What is high-frequency trading or algorithmic trading, and why is it commonly associated with dark pools?