“Building error-free trading software is impossible, and that makes today’s stock markets even more fragile.
FORTUNE — One question keeps arising in the saga of Knight Capital and its $440 million software glitch: why did Knight, one of the premier U.S. market makers that handles more than 10% of total stock trading, introduce glitchy software into the market?
CEO Thomas Joyce explained in a television interview that the company’s new software program sent thousands of erroneous trades into the market because of “a large bug.” This was software Knight introduced Wednesday in conjunction with the New York Stock Exchange’s new platform that allows market makers like Knight (KCG) to offer slightly discounted stock prices to retail investors.”
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