The New York Stock Exchange halted trading in all securities as it addressed a computer malfunction and said it canceled all outstanding orders.

"We're currently experiencing a technical issue that we're working to resolve as quickly as possible," Marissa Arnold, an NYSE spokeswoman, said in an e-mailed statement. "We will be providing further updates as soon as we can, and are doing our utmost to produce a swift resolution, communicate thoroughly and transparently, and ensure a timely and orderly market re-open."

Stocks stopped trading on the exchange's platform at about 11:32 a.m. in New York. They continued to change hands on other venues such as the Nasdaq Stock Market and Bats Global Markets.

Kevin Callahan, a spokesman for the Securities and Exchange Commission, declined to comment.

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