In a hurry: Manoj Narang, founder and head of Tradeworx, buys and sells millions of shares every day, using algorithms that often execute thousands of trades per second. Credit: Steve Moors

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If Manoj Narang is about to bring down the markets, he's certainly relaxed about it. Narang, who wears a goatee and wire-frame glasses, is casually dressed in a brown shirt and dark gray sweatshirt. Sitting on a swivel chair with one leg tucked under the other, he seems positively composed, especially for a man who has just bought and sold 15 million shares with a total value of $600 million. For Narang, however, such volume represents just the start of a normal day. Though it's about noon on a Friday morning, he has barely begun.

Narang is the head of Tradeworx, a hedge fund and financial-technology firm that makes purely automated trades; all decisions are reached and acted on at near light speed by computers running preprogrammed algorithms. "Actually, we run two businesses," he says. "The first trades in and out of shares in about a second and holds them for an average of two or three days. That's the medium-speed fund. The high-speed fund could make thousands of trades a second and holds them for a matter of minutes."