Onex Corp., a Toronto-based private equity firm, has acquired Nielsen Expositions for $950 million.

In 2012, Nielsen’s expo division had revenue of approximately $183 million with adjusted EBITDA of $97 million. Those earnings account for about 3 percent of Nielsen Holdings’ total, according to the company’s annual report.  Organizing more than 65 tradeshows and events each year, the unit’s major holdings include ASD, the Hospitality Design Expo (HD Expo), the Kitchen & Bath Industry Show (KBIS), the Outdoor Retailer Summer and Winter Markets and Interbike. According to its annual report, Nielsen Expositions has more than 40 events spread across 20 industries and connects 300,000 buyers and sellers each year.

Nielsen Expositions suffered a 7-percent decline in revenues, according its recent first quarter earnings report.

Onex, with offices in Toronto, London and New York, has about $15 billion of assessments under its management.  Its shares are traded on the Toronto Stock Exchange.