NYSE to Test Trading System in Preparation for Twitter IPO

The New York Stock Exchange will allow trading firms to test their systems in preparation for Twitter Inc.’s initial public offering, as market participants seek to prevent technical failures like those that marred Facebook Inc.’s debut last year.

The exchange, run by NYSE Euronext, will let firms test their trading systems in a mock opening auction of Twitter’s stock, it said in a notice to traders Friday. The dry run is set for Saturday, Oct. 26.

Earlier this week, Twitter revealed in a regulatory filing it would list its shares on the NYSE with the ticker symbol TWTR.

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