The LSE is also said to be in talks with Euronext, Europe's Nasdaq-equivalent electronic exchange.
Even the New York Stock Exchange merged back in 2007 with Euronext, in Paris.
Nasdaq is under pressure to stand-out after Atlanta-based ICE said it would merge with NYSE Euronext.
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Nasdaq OMX Group competes with other exchanges like NYSE Euronext and Chicago Mercantile Exchange.
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Nasdaq indeed tried a takeover of NYSE Euronext, only to eventually drop the bid.
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He merged NYSE with Archipelago, an electronic exchange, and then last year with the Parisian Euronext.
Mr. Ryan said his firm discussed options activity in NYSE Euronext with the SEC's market-abuse unit.
Nielsson studied the effects of exchange acquisitions, particularly the Euronext merger, for his Ph.
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The decisive hurdle for the deal is a vote by Euronext's shareholders on December 19th.
Euronext also suggested that Liffe, London's independent derivatives exchange, might co-operate with the new Euronext.
The clearing house is a joint venture between NYSE EuroNext and the Depository Trust Clearing Corporation (DTCC).
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Now, no longer the belle of the ball, Clara Furse needs to clinch a deal with Euronext.
To enable that, NYSE Euronext and Startup America offer a free technology platform called Corporate Connections.
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But now there are dozens of different markets, and not just NYSE Euronext, CME Group, and Nasdaq.
Major competitors of Nasdaq OMX are NYSE Euronext, CME Group, BATS Global and Direct Edge.
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He criticised Euronext's launch last year of Alternext, a market geared to smallish firms, for increasing fragmentation.
But according to Bridgewell Securities analyst Geoff Miller, regulatory uncertainty could delay the timing of a Euronext bid.
In a related program, the New York Stock Exchange (NYSE Euronext) launched the NYSE Big StartUp.
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Markets will open on their regular schedule in New York, NYSE Euronext and Nasdaq posted on their websites.
Wall Street has been abuzz with the proposed merger between the NYSE Euronext ( NYX) and Deutsche Boerse.
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Nasdaq needs a foothold in Europe after its rival, the New York Stock Exchange, purchased Euronext earlier this year.
There has even been speculation that Euronext and Deutsche Boerse could merge with each other, leaving the LSE isolated.
Still, Euronext, a Pan-European exchange, has managed to juggle multiple regulators and thrive.
And with use cases from organizations like the NYSE Euronext, the Zend approach should get more and more attractive.
They still get about 85 percent of the liquidity that they would have on NYSE-Euronext or NASDAQ, said Fuchs.
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The most important issue, of course, will be whether the new bid provides more value to NYSE Euronext shareholders.
NYSE, now with Euronext under its belt, is seen buying a U.S. futures exchange or another foreign equity exchange.
Other competitors in the financial sector include: NYSE Euronext (NYX), IntercontinentalExchange (ICE), and CME Group (CME).
At the moment, only Euronext, the merged French, Dutch and Belgian exchange, uses a central counterparty for equity deals.
It has scorned Macquarie Bank, and received interest from Euronext, Deutsche Boerse, and most recently, Nasdaq.
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