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As of August 15, 2025, the largest mutual fund in the world was the Vanguard Total Stock Market Index Fund, listed under the ticker VTSAX, which had an astonishing **** trillion U.S. dollars of net assets under management (AUM). However, it should be noted that this investment fund has been divided into multiple distinct products, not all of which are sold as mutual funds. Some shares in the fund are sold as an exchange traded, meaning it could be argued that, strictly speaking, the Vanguard Total Stock Market Index Fund in its totality cannot be classed as a mutual fund. A similar situation holds for several other investment funds included in this statistic. 

An ETF is a basket of shares (or other financial assets) which generally tracks an underlying index. They are similar to mutual funds, with the fundamental difference that ETFs are listed on stock exchanges, with ETF shares being traded just like regular stock.