A substantial part of all stock trading in the United States takes place in a warehouse in a nondescript business park just off the New Jersey Turnpike.
Few humans are present in this vast technological sanctum, known as New York Four. Instead, the building, nearly the size of three football fields, is filled with long avenues of computer servers illuminated by energy-efficient blue phosphorescent light.
Countless metal cages contain racks of computers that perform all kinds of trades for Wall Street banks, hedge funds, brokerage firms and other institutions. And within just one of these cages — a tight space measuring 40 feet by 45 feet and festooned with blue and white wires — is an array of servers that together form the mechanized heart of one of the top four stock exchanges in the United States.
From The New York Times
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