The exchange grew out of the loosely organized curb market of curbstone brokers on Broad Street in Manhattan. Efforts to organize and standardize the market started early in the 20th century under Emanuel S. Mendels and Carl H. Pforzheimer. The curb brokers had been kicked out of the Mills Building front by 1907, and had moved to the pavement outside the Blair Building where cabbies lined up. There they were given a "little domain of asphalt" fenced off by the police on Broad Street between Exchange Place and Beaver Street. As of 1907, the curb market operated starting at 10 AM, each day except Sundays, until a gong at 3 PM. Orders for the purchase and sale of securities were shouted down from the windows of nearby brokerages, with the execution of the sale then shouted back up to the brokerage.

Trade volume: $608.091 billion (2005). Listing: 814 companies (2006). Capitalization: $82.66 billion (2006). Profit: $89 million (2004).