Over 80 percent of American securities are traded on the NYSE, the oldest and largest of all United States stock exchanges. In 1991, over 10, 000 institutions managing $3.5 trillion in securities had access to and used the NYSE market. Outside the Exchange grows a tree that resonates symbolically to the buttonwood tree where the first traders gathered to exchange stock. A visitors gallery and self-guided tours. Tickets are needed for guided tours and are limited, so arrive early. No cameras.