The operators of the nation’s largest stock exchanges said Tuesday afternoon their two-day storm-related nightmare is ending and they will reopen for business as normal on Halloween.

NYSE Euronext, which operates the New York Stock Exchange and the all-electronic NYSE Arca exchange, said it “will open for normal trading operations in coordination with all U.S. equities, bonds, options and derivatives markets” on Wednesday.

The New York Stock Exchange, which still uses human traders on its floor, will open at 9:30 a.m. “under normal opening procedures,’’ it said. Earlier Tuesday, the NYSE said its trading floor systems were not harmed by Hurricane Sandy, which swept through lower Manhattan Monday causing widespread damage.

“Our building and systems were not damaged and our people have been working diligently to ensure that we have a smooth opening tomorrow,’’ said NYSE Euronext chief executive Duncan Niederauer, in announcing the re-opening.

The NASDAQ OMX Group said all its exchanges as well as its trade reporting facility will open for business, as well

These include:

  • The NASDAQ Stock Market
  • NASDAQ OMX BX
  • NASDAQ OMX PSX
  • The NASDAQ Options Market
  • NASDAQ OMX PHLX
  • NASDAQ OMX BX Options
  • The NASDAQ OMX Futures Exchange
  • NASDAQ OMX Commodities Clearing Company (NOCC)
  • FINRA/NASDAQ Trade Reporting Facility (ACT)

BATS Global Markets said its BYX Exchange, BZX Exchange and BATS Options exchanges also will open on normal schedules Wednesday.
Direct Edge said its EDGA and EDGX exchanges also will open Wednesday. Its exchanges typically open for pre-market trading at 8:00 a.m. and normal trading at 9:30 am.

The exchanges conducted test sessions Tuesday. NASDAQ said it would remain open for testing until 4:30 p.m.

None of the exchanges actually operate in lower Manhattan, even though the New York Stock Exchange maintains a trading floor at 11 Wall Street.

The data centers that house their operations are all across the Hudson River, in Carteret (Nasdaq), Mahwah (NYSE), Secaucus (Direct Edge) and Weehawken (BATS), N.J.

Nasdaq’s backup facility is in Ashburn, Va. BATS’ is in Nutley, N.J. Direct Edge’s is in Clifton, N.J.

NYSE Euronext’s $250 million Mahwah data center, which opened in 2010, was unaffected, said spokesman Robert Rendine.

The facility is built to withstand hurricane weather and has back-up power generation on site that can run for a week before needing more fuel.

The exchange operator also has a backup facility in the Midwest, Rendine said.

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