The lower fees have helped Vanguard attract a growing number of ETF investors, and the provider now leads ETF sales so far this year. [Vanguard Leading ETF Sales in 2013: Report]

For instance, the Vanguard Total Stock Market (NYSEArca: VTI), which now tracks the CRSP index, has attracted $3.4 billion in new inflow year-to-date, according to IndexUniverse data. Also, the switch over to FTSE has helped the Vanguard FTSE Emerging Markets (NYSEArca: VWO) stem the outflow from emerging market assets – VWO lost $3.8 billion in assets so far this year, whereas iShares MSCI Emerging Markets (NYSEArca: EEM) experienced $8.5 billion in redemptions.

For more information on ETF indexing, visit our indexing category.

Max Chen contributed to this article.