Regional Exchanges

The remaining 6 percent of annual share volume takes place on several regional exchanges in the United States. These exchanges list about 100 to 500 securities of firms located in their area. Regional exchange membership rules are much less strict than for the NYSE. The top regional exchanges are the Boston, Chicago, Philadelphia, and National (formerly the Cincinnati) exchanges. An electronic network linking the NYSE and many of the regional exchanges allows brokers to make securities transactions at the best prices.

The regional exchanges, which have struggled to compete, benefited from the passage of the Securities and Exchange Commission's (SEC's) Regulation NMS (National Market System), which became fully effective in 2007. Regulation NMS makes price the most important factor in making securities trades, and all orders must go to the trading venue with the best price.