Boston Consulting Group, Inc. (BCG) is an American global management consulting firm founded in 1963 and headquartered in Boston, Massachusetts. It is one of the Big Three along with McKinsey & Company and Bain & Company. Since 2021, the consultancy has been led by the German executive Christoph Schweizer.

McKinsey & Company is an American multinational strategy and management consulting firm that offers professional services to corporations, governments, and other organizations. Founded in 1926 by James O. McKinsey, McKinsey is the oldest and largest of the "Big Three" management consultancies (MBB). The firm mainly focuses on the finances and operations of their clients.