PARIS: The US commodities and financial market operator InterContinentalExchange (ICE) has agreed to buy transatlantic peer NYSE Euronext for $8.2 billion (6.2 billion euros) to create the world's biggest market operator, the two companies said Thursday.

The deal, which is expected to be finalised in the second half of next year subject to regulatory approvals, was unanimously approved by the boards of both market operators, they said in a statement.

If it is completed, the New York Stock Exchange's nearly 200-year existence as an independent financial market will come to an end.

In addition, ICE then plans to sell shares in Euronext “as a Continental European-based entity” if there is support for such an operation from European policymakers and the markets, the statement added.

Euronext operates the main stock exchanges in Paris, Brussels, Amsterdam and Lisbon. NYSE Euronext includes the New York Stock Exchange and the European derivatives market Liffe.

ICE runs a specialist market on which raw materials are traded, along with financial products linked to foreign exchange and interest rates.

Under the terms of the deal, ICE is offering $33.12 for each share in NYSE Euronext, a premium of 37.7 per cent over its closing price on Wednesday of $24.05.

ICE shares are to account for 67 per cent of the transaction, with the rest to be paid in cash.

NYSE Euronext shareholders are thus expected to own around 36 per cent of ICE's equity once the deal has been completed.

The two market operators estimate cost savings from the tie-up of $450 million in the second full year of combined operations.

An increase in earnings of more than 15 per cent is forecast in the first full year.

ICE plans to maintain two headquarters, in Atlanta and in the iconic New York Stock Exchange building on Wall Street, the statement said.

It added that ICE founder Jeffrey Sprecher would continue as chairman and chief executive of the combined company, while Duncan Niederauer would be the president and chief executive of the NYSE Group.

Sprecher said the deal came in response “to the evolution of market infrastructure today and offers a range of growth opportunities, while enhancing competition in US and European markets.”

He added that the tie-up would broaden “our ability to address new markets and offer innovative products and services on a global platform.”

In addition, “With a track record of growth and returns, clearing and M&A (mergers and acquisition) integration, we are well positioned to transform our combined companies into a premier global exchange operator that remains a leader in market evolution,” Sprecher said.

In early 2012, a plan to combine NYSE Euronext with the German market operator Deutsche Boerse was rejected by the European Commission on competition grounds, since the combined company would have had a massive presence in the trading of financial derivatives in Europe.

In 2011, ICE joined forces with the high-tech Nasdaq market operator to try and buy part of NYSE Euronext, but that deal fell through under pressure from US justice officials.