Northern Trust has been appointed by Aristotle Capital Management, LLC to provide middle office outsourcing services for institutional portfolios managed by its equity affiliates. The partnership, which has already been implemented, covers portfolios representing approximately $40bn AuM. Under the mandate, Northern Trust will provide investment operations outsourcing via its middle office platform. Headquartered in Los Angeles, Aristotle is a majority employee-owned firm that employs a bottom-up, fundamental investment approach in the management of international, global, and U.S. equity portfolios.