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The New York Stock Exchange said it will pay $5 million to resolve U.S. regulatory charges that it gave certain customers “an improper head start” on trading information.

The exchange operators extended the deadline for completing their planned tie-up to March 31 while European competition authorities continue an in-depth probe of the deal.

Viacom said it is voluntarily transferring its stock-exchange listing to the Nasdaq Global Market, from the New York Stock Exchange, as Nasdaq successfully lured away one of the biggest media companies from the Big Board.

The New York Stock Exchange's website experienced slowness for a brief period of time Monday afternoon, on the same day that the hacker group "Anonymous" called for an attack against the Big Board operator's site.

Nasdaq OMX has stepped up its opposition to the planned merger between NYSE Euronext and Deutsche Börse and said the deal would "irrevocably destroy" competition in Europe's listed-derivatives markets, just as the European Commission nears a decision on the tie-up.

Main stock exchanges Nasdaq, NYSE and BATS expect to open trading on Monday as usual despite Hurricane Irene, although a final decision, especially on opening the Big Board floor, is yet to come.

The top executive of NYSE Euronext said a critical European Union review of the company's agreed-upon tie-up with Deutsche Börse will likely result in conditions being placed on the combined company, rather than an outright block of the deal.

The New York Stock Exchange, an icon of American capitalism, is expected to take a crucial step toward ceding control to a German company on Thursday, with little opposition expected from investors.

Nasdaq and IntercontinentalExchange are withdrawing their proposed $11 billion bid for the parent of the New York Stock Exchange after recognizing they would not receive regulatory approval for the transaction.

Nasdaq OMX and IntercontinentalExchange said they will take their bid for NYSE Euronext directly to shareholders after being rebuffed twice by the exchange.