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Third-quarter profit more than tripled at the New York Stock Exchange, fueled by the Big Board's acquisition of electronic marketplace Archipelago.

NYSE Group

(NYX)

, the parent company of the NYSE, made $67.9 million, or 43 cents a share, compared to $22 million, or 18 cents a share, a year ago. Revenue rose 33.3%, to $602.9 million.

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Analysts were predicting the Big Board to earn 41 cents a share in the quarter, according to Thomson Financial.

The third-quarter results included $7.7 million in merger-related expenses. But that was largely offset by $7.2 million for a payment stemming from the NYSE's previously announced phase out of its service agreement with the Securities Industry Automation Corporation.

In a related move, the NYSE announced late Wednesday that it would buy out the one-third ownership stake in the SIAC held by the American Stock Exchange for $40 million. The deal is expected to close next month.

Analysts and investors will be waiting to hear what the exchange says about its anticipated $10 billion merger with Euronext, a big European exchange. Euronext and NYSE shareholders are scheduled to vote on the deal in December.

The new company, to be called NYSE Euronext, will be a US-based holding company with shares listed on the New York Stock Exchange and on Euronext in Paris.