State Street’s SPDR S&P 500 (NYSEArca: SPY) is the largest ETF in the world with about $155.5 billion. It has hauled in about $8.6 billion so far in 2013 as of July 31, according to IndexUniverse data.
BlackRock’s iShares is the largest U.S. ETF provider with assets of $607.5 billion, according to XTF. Through July, it saw net inflows of $20.6 billion so far in 2013.
Overall, the U.S. exchange traded product business stood at roughly $1.5 trillion at the end of July, with year-to-date inflows of $115 billion.
Full disclosure: Tom Lydon’s clients own GLD and SPY.