The rise and continued growth of BlackRock, the world's largest asset management firm. : With $6.28 trillion in assets under management, BlackRock, Inc. (BLK) is, at least by that measure, the largest investment management company in the world, publicly traded or otherwise. Boasting a market capitalization of over $86 billion, the firm sells mutual funds, exchange-traded funds, and closed-end funds, in addition to other vehicles that focus on objectives ranging from retirement income (the firm’s own branded CoRI funds) to college saving plans.