This article was first published in the Financial Post on January 13, 2008.
In the old days, stock exchanges had a monopoly on trading listed stocks. Not any more. These days, electronic platforms known as “alternative trading systems” (ATSs) provide investors with a variety of trading forums. Some of these, like BlockBook, Liquidnet and MATCH Now, exist solely to cross large (mostly institutional) blocks of stock. But others, like Pure Trading, Alpha, Chi-X Canada and Omega, serve the entire investment community — trading some or all of the TSX and TSX-V listed stocks.
By introducing competition to stock trading, ATSs have already lowered the cost and increased the speed and efficiency with which stocks are traded. Nonetheless, the ATS phenomenon is still in its infancy in Canada — and so is the regulatory framework. While the regulatory apparatus mostly works very well, some recent trading practices have arisen that materially compromise the fundamental principles of price discovery and liquidity that lie at the very core of a modern trading system.
Price discovery involves the determination of a suitable trading price for a given security. Liquidity occurs when investors can easily (and at reasonable cost) find a counterparty with whom to trade.