Vanguard Group's Standard & Poor's 500 ETF is on the edge of finally seizing the title of the world's largest exchange-traded fund from rival State Street Global Advisors' product, the SPDR S&P 500 Trust ,

The oldest exchange-traded fund listed in the U.S. has just been surpassed in assets under management by a Vanguard ETF that more cheaply tracks the S&P 500 index.

Vanguard has unseated State Street for the title of the world’s biggest exchange-traded fund, ushering in a new world order for the $11 trillion industry.