NYSE Euronext said its previously reported program-trading percentage of 48.6% for the week of June 22 to June 26 was correct because it included trades by Goldman Sachs & Co. even though the firm was left off the list of most active firms.
The absence of Goldman Sachs on NYSE's weekly list raised eyebrows. Speculation surrounding the matter increased over the weekend after the U.S. Justice Department arrested a former Goldman Sachs employee and charged him with stealing computer codes related to the firm's high-speed trading platform.
The snafu also fueled concerns about the exchange itself, which suffered a rash of technical problems last week after implementing a new trade-execution system. On Thursday, it even extended equity-market trading by 15 minutes because of a connectivity problem.
On Tuesday, the NYSE revised its list of most active firms in program trading, placing Goldman at the top ahead of Credit Suisse Group's securities unit.
The exchange also revised volume to 1.676 million program-traded shares per day from 1.678 million. NYSE also changed the figure for program trading in all markets by member firms to 4.896 billion from 4.899 billion.
The NYSE publishes figures on program trading -- the act of using computer models to engage in purchases or sales -- of its member firms once a week. Program trading has picked up significantly this year as high-frequency trading desks have grown.
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