The Vanguard Emerging Markets Stock Index Fund began tracking the FTSE Emerging Index on Jan. 10, 2013. Because of the index change, the name of the fund's exchange-traded fund will  change to the Vanguard FTSE Emerging Markets ETF. The ETF's ticker symbol will not change.

The Emerging Markets Stock Index Fund has $76 billion in assets, making it the largest fund in its category. VWO, a share class of the fund, has $60 billion in assets and was the top-selling emerging markets ETF in the United States in 2012, according to IndexUniverse.

The FTSE Emerging Index is a market capitalization-weighted index that provides comprehensive coverage of emerging markets. The index was developed by FTSE, a leading provider of indexes used by asset managers and investors worldwide. Vanguard has entered into long-term agreements with FTSE that are expected to provide cost certainty and savings over time for investors.