Mellon Financial Corp. will buy Unifi Network, a human resources consulting and outsourcing unit of PriceWaterhouseCoopers. The $275 million deal is expected to close early in the first quarter of next year. Other terms were not disclosed, the company said in a statement.

Mellon plans to combine Unifi with Buck Consultants and Mellon Employee Benefit Solutions (MEBS), part of the human resources and consulting arm of Mellon’s Global Investment Services division. As a result, Mellon will be the fourth-largest provider of HR consulting and administration services worldwide, according to the company.

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