Berkshire Hathaway Inc. (BRKA, BRKB) and CME Group Inc. (CME) eyed deals for different pieces of NYSE Euronext (NYX) ahead of the Big Board parent's agreement to be acquired by IntercontinentalExchange Inc. (ICE), people with knowledge of the discussions said.

In late November, Berkshire outlined a proposal to acquire NYSE Euronext that would have first required the sale of the exchange group's prized European derivatives business, while CME months earlier approached its exchange rival about pieces of that same division, the people said.

The focus on NYSE's London-based Liffe futures unit, disclosed partially Monday in a regulatory filing, underscores its importance in the agreed $8.2 billion takeover by ICE, disclosed Dec. 20. ICE aims to fuse the division with its own U.K. energy markets while adding NYSE's U.S. stocks and options franchise to the commodities-market portfolio of the Atlanta-based exchange group.

A spokeswoman for CME declined comment Monday. Berkshire Chairman Warren Buffett declined to comment.

The deal options weighed by NYSE were disclosed in a filing that also outlined the regulatory hurdles faced by the ICE plan, challenges that have torpedoed several major exchange tie-ups in recent years.

As discussions with ICE proceeded last autumn, NYSE Euronext advisers Perella Weinberg Partners LP on Nov. 25 reached out to "a large industrial and financial-holding company" to explore interest in a possible acquisition of NYSE's business, the filing said. A person familiar with the matter confirmed that this company was Berkshire Hathaway. CNBC earlier reported Berkshire Hathaway's involvement.

On Nov. 28, NYSE Euronext received the proposal conditioned on the sale of NYSE's European derivatives business at a minimum sale price specified by the bidder, according to the filing. NYSE said in the filing that the proposal carried a lower value than a deal outlined by ICE, and that the company couldn't commit to a time frame for completing due diligence on such a deal.

NYSE separately disclosed in the filing that it had been approached by "a large U.S.-based derivatives exchange" about a "potential but non-specific interest in components of NYSE Euronext's derivatives business." That exchange was Chicago-based CME, according to people close to the discussions.

At an October 25 board meeting, NYSE directors authorized executives to continue weighing a possible sale of the European derivatives division, as well as exploring a deal with ICE and remaining independent, according to the filing.

CME already controls the vast majority of trading on listed U.S. futures markets, such as Treasury yields, stock indexes and grains, and is developing its own London-based U.K. exchange to expand in Europe. Securing NYSE's London-based derivatives business, with a focus on European interest rates, would have earned CME the region's second-largest futures platform measured by trading activity, after Germany's Deutsche Boerse AG (DB1.XE, DBOEF).

On Dec. 13, NYSE's board of directors determined to move ahead with the ICE proposal, according to the filing.

ICE and NYSE plan to submit their deal for formal review by the European Commission by July 2013, according to the filing. Putting the deal up for review by the regional body would streamline a process that otherwise would require the individual sign-off of antitrust regulators in the U.K., Spain and Portugal, though those agencies would have to allow the European Commission to take up the review.

In the U.S., approval must be secured from the Federal Trade Commission and the Department of Justice, according to the filing.

About a dozen financial-regulatory authorities in the U.S. and Europe will also need to green-light the deal, according to the filing. Regulators in other jurisdictions, including Japan, Brazil, Hong Kong and Singapore, will be formally notified with respect to the exchanges' business in those places, according to the filing.

--Jason Zweig contributed to this article.

Write to Jacob Bunge at jacob.bunge@dowjones.com and Anupreeta Das at anupreeta.das@wsj.com.

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