Global exchange-traded fund assets have increased by 13.9% from $1.35 trillion to $1.54 trillion year-to-date, through the end of July 2012, according to data from ETFGI, a London-based research shop.

The firm also revealed that last month, ETFs saw net inflows of $24 billion and $123 billion year-to-date. Vanguard gathered the largest net ETF inflows YTD with $34.3 billion, followed by iShares with US$30.8 billion and SPDR ETFs with $16 billion in net inflows.

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