The business of ETFs is dominated by three big players: BlackRock’s iShares, Vanguard Group, and State Street, which collectively control 82% of the roughly $2 trillion invested in ETFs. Other firms are fighting to gain market share, and several have made their way into Bloomberg Markets’ annual ranking of the fastest-growing funds over the three years ended on Dec. 31.

Charles Schwab  has two of the funds on this year’s list: Schwab U.S. Large-Cap and Schwab U.S. Broad Market. “Those ETFs are boring as dirt,” says Dave Nadig, chief investment officer at research firm, pointing out that the Schwab ETFs track common market indexes. They’re also very cheap, which is their main appeal, he says.

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