Other Trading Platforms
In the last 30 years, brokers have created two additional systems for trading securities. The alternative trading system, or ATS, is a quasi exchange where stocks are commonly purchased and sold through a smaller, private network of brokers, dealers, and other market participants. The ATS is distinguished from exchanges and associations in that the volumes for ATS trades are comparatively low, and the trades tend to be controlled by a small number of brokers or dealers. ATS acts as a niche market, a private pool of liquidity. Reg ATS, an SEC regulation issued in the late 1990s, requires these small markets to 1) register as a broker with the NASD, 2) register as an exchange, or 3) operate as an unregulated ATS, staying under low trading caps.
A specialized form of ATS, the Electronic Communications Network (or ECN), has been described as the "black box" of securities trading. The ECN is a completely automated network, anonymously matching buy and sell orders. Many traders use one or more trading mechanisms (the exchanges, NASDAQ, and an ECN or ATS) to effect large buy or sell orders -- conscious of the fact that overreliance on one market for a large trade is likely to unfavorably alter the trading price of the target security.
Read more about this topic: Securities Exchange Act Of 1934
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