The New York Stock Exchange NYX +0.32% said its trading floor would be closed starting Monday, as New York City braced for Hurricane Sandy and a shutdown of the city’s transit system.

Trading in all securities listed on the Big Board will be moved to Arca, an electronic trading platform operated by New York Stock Exchange parent NYSE Euronext, according to a statement by the company. The market operator said activity will also be suspended on its NYSE MKT exchange, formerly known as the Amex.

“We are open for business and at the same time acting in accordance with actions taken by the city and state of New York,” said Duncan L. Niederauer, chief executive of NYSE Euronext, in a statement.

The exchange last closed its trading floor for the Sept. 11, 2001, terror attacks.