The $950m acquisition was announced last month and the sale is part of Nielsen’s strategy to invest in and develop capabilities across its watch and buy segments.

At the time of the announcement, Nielsen’s CFO Brian West said: “Divesting the Expositions business allows us to focus on these core areas that provide our clients with a comprehensive understanding of consumers while providing more flexibility to return capital to our shareholders over time.”

Onex Partners III made an equity investment of approximately $350m, of which Onex’ share was $85m as a limited partner in the fund. Concurrent with the closing of the acquisition, the company was renamed Emerald Expositions.