After four decades of steady growth, the Vanguard Group is now the nation's largest fund company, with $1.6 trillion under management. Its three core strengths: a solid reputation for putting investors first, its emphasis on giving broad exposure to the stock market through index funds and its low fees.

Now, Vanguard hopes to keep its crown-and build on it-with a microsite celebrating 35 years of indexing, said Amy Chain, a public relations associate at Vanguard.

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