Private equity firm Onex Corp. (TSX: OCX) is buying Nielsen Expositions, a tradeshow operator and subsidiary of ratings agency Nielsen Holdings NV (NYSE: NLSN), for $950 million.

New York-based Nielsen operates business-to-business tradeshows in the U.S. for the general merchandise, sports, hospitality and retail design, jewelry and photography industries. The company has 240 employees and produces about 65 tradeshows per year.

Onex, headquartered in Toronto, has about $15 billion in assets under management. The firm’s investments include Celestica Inc. and Sitel Worldwide. In February the firm sold its 50 percent stake in RSI Home Products for $323 million. 

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