Vanguard’s Total World Stock ETF (VT) began trading today.

The fund, which carries an expense ratio of 0.25%, tracks an index of 2,900 stocks in 47 countries.

FTSE All-World Index is a market-capitalization-weighted index designed to measure the performance of large- and mid-capitalization stocks worldwide. Stocks of companies domiciled in developed and emerging international markets represent approximately 59% of the index; the remaining 41% are U.S. stocks.