By Katy Burne and Ian Walker 

Part of the London Stock Exchange Group has agreed to acquire upstart bond platform operator Bonds.com Group Inc. for $15 million, according to company officials, as part of its push to enter the U.S. market for bond trading.

The all-cash acquisition of Bonds.com by a unit of the London Stock Exchange's MTS Group constitutes the latest exchange, following NYSE Euronext and Deutsche Borse AG, to position itself for the gradual shift by U.S. investors into trading corporate bonds on electronic screens rather than over the telephone.

For decades, trading in the $9.6 trillion U.S. corporate bond market has been done primarily over the phone, and shielded from the public spotlight on stock markets. But, recent gyrations in the bond markets and a pullback by large bond dealers has jarred trading in the aftermarket, where bonds trade following their initial offering. That has lured more dealers and investors to use more open, electronic platforms.

The deal, which is set to close in the second quarter of this year, will see existing shareholders in Bonds.com-private equity firm Oak Investment Partners, broker GFI Group Inc.'s subsidiary GFInet Inc., Mida Holdings, and Daher Bonds Investment Company-exit their investments. Also set to exit are Jefferies Group, now owned by Leucadia National Corp., and UBS AG, which held smaller stakes in Bonds.com. Representatives at these companies either didn't immediately return messages or declined to comment.

"We are taking advantage of a few clear trends [including] the trend toward electronic trading and the trend toward globalization," said Mark Monahan, chief executive of MTS Markets International Inc.

MTS Markets International already trades bonds electronically in Europe. The European venue sees about $100 billion of trades a day on average.

Bonds.com, which caters to corporate bonds and emerging market bonds, has about 600 investor and dealer participants on its New York platform, and is known for offering a range of trading methods to investors, including live streaming prices in an exchange-like format.

Last month, Deutsche Borse AG agreed to buy another bond trading platform owned by start Bondcube Ltd, for "a low sum in the single digit millions" of British pounds.

Bonds.com spent four months looking for a buyer or strategic partner after incurring debt and losing money.

"The combination of the MTS footprint in Europe and the growing Bonds.com brand in the U.S. creates a potentially significant player in the market," said Anthony Perrotta, CEO of fixed-income consultancy Cornerstone Resources, LLC.

Write to Katy Burne at katy.burne@wsj.com and Ian Walker at ian.walker@wsj.com

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