DAVOS, Switzerland--NYSE Euronext (NYX) has no intention of selling its European unit to a rival after its takeover by IntercontinentalExchange Inc. (ICE), according to NYSE Euronext's chief executive.

Duncan Niederauer told The Wall Street Journal that the combined company would instead press on with a spin-off of Euronext, the European electronic stock-exchange business that includes markets in Paris, Amsterdam, Brussels and Lisbon.

The Euronext spinoff plan was first outlined last month when NYSE Euronext unveiled its $8.2 billion takeover by ICE, partly to allay potential nationalistic concerns that exchanges managed from afar could diminish the influence of European financial hubs, hurting their ability to control jobs and other aspects of the businesses.

However, the proposed separation of Euronext, a top exchange operator in the competitive European market, sparked interest from rivals, according to people familiar with the situation.

Mr. Niederauer's comments are the clearest indication to date of NYSE's determination to list Euronext separately in spite of that interest.

Both Nasdaq OMX Group Inc. (NDAQ) and the London Stock Exchange Group PLC (LSE.LN) have made informal inquiries about buying Euronext, people familiar with the discussions said.

Nasdaq Chief Executive Robert Greifeld has told colleagues and others outside the company that he would want to take a look at Euronext if it were to become available, according to people familiar with the discussions. A Nasdaq spokesman said Wednesday that that remains the company's view, noting that Nasdaq's interest wouldn't necessarily mean it would pursue a deal. An LSE spokeswoman declined to comment on any potential deal interest.

Mr. Niederauer, in Davos for the annual meeting of the World Economic Forum, declined to comment on the identity of potential suitors.

But he said it "would not be in the interests" of the combined company's shareholders to pursue a sale of Euronext.

Some regulators have also made clear to NYSE that the spin-off was their preferred option, Mr. Niederauer said.

"What regulators want is stability," said Dominique Cerutti, NYSE Euronext's deputy chief executive and a likely choice as CEO of an independent Euronext. "I am not sure they are ready to discuss whether they want consolidation" among exchange providers in Europe.

NYSE Euronext has not disclosed Euronext's likely valuation in a spin-off. The business carries relatively low profit margins, and faces potential challenges from new European taxes on financial transactions and increased regulation of automated trading.

NYSE Euronext has estimated that its European stocks and derivatives business generated $560 million in revenue during the 12 months that ended Sept. 30. Sandler O'Neill + Partners estimated a pre-tax operating margin of 25% for the business, compared with ICE's profit margin of 60% for a company that is devoted nearly entirely to derivatives trading and clearing.

An IPO of Euronext could value the unit at $1.39 billion, according to an estimate from Equity Research Desk.

--Jacob Bunge contributed to this article.

Write to Francesco Guerrera at francesco.guerrera@wsj.com and Jenny Strasburg at jenny.strasburg@wsj.com

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