NYSE Euronext, which runs the New York Stock Exchange, had previously said that electronic trading would remain open and that only the exchange's trading floor would close.

In a statement, the company said that "the dangerous conditions developing as a result of Hurricane Sandy will make it extremely difficult to ensure the safety of our people and communities, and safety must be our first priority."

(Reporting By John McCrank, Writing by Dan Wilchins; Editing by Ken Wills)

By John McCrank

Stocks treated in this article : NASDAQ OMX Group, Inc., NYSE Euronext