Vanguard is a massive investment management company, offering mutual funds, exchange-traded funds (ETF), 401(k) plans, and many other financial products and tools. The company's founder, Jack Bogle, popularized low-cost passive investing through index funds.

Warren Buffett is a big fan of Bogle, famously saying, "If a statue is ever erected to honor the person who has done the most for American investors, the hands down choice should be Jack Bogle."

You may assume that the Vanguard S 500, which mirrors the performance of the S 500, is the company's largest mutual fund. And with $851 billion in assets combining standard open-end mutual fund and ETF assets, it is certainly up there. But Vanguard's largest fund is, by far, Vanguard Total Stock Market (NYSEMKT: VTI) with a staggering $1.27 trillion in net assets combining ETF and traditional mutual fund shareholders.

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Source Fool.com