Seeking to maintain its preeminent position among the stock markets of the world, the New York Stock Exchange is nearing completion of a $125 million overhaul of its trading operations.

The massive retooling of the exchange's frenetic trading floor in the heart of Wall Street represents the culmination of three years of planning and testing by the exchange, its brokerage firm members, and its wholly owned technology subsidiary, the Securities Industry Automation Corp.

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