BlackRock, Inc. is an American multinational investment company. It is the world's largest asset manager, with $10 trillion in assets under management as of December 31, 2023. Headquartered in New York City, BlackRock has 78 offices in 38 countries, and clients in 100 countries. BlackRock is the manager of the iShares group of exchange-traded funds, and along with The Vanguard Group and State Street, it is considered to be one of the Big Three index fund managers. Its Aladdin software keeps track of investment portfolios for many major financial institutions and its BlackRock Solutions division provides financial risk management services. The head of Aladdin is Sudhir Nair. As of 2023, BlackRock was ranked 229th on the Fortune 500 list of the largest United States corporations by revenue.