Assets of all exchange-traded funds rose in May by $12.14 billion to $1.481 trillion, according to theInvestment Company Institute.

Domestic equity ETFs have gathered $222.19 billion since May 2012, and global equity ETFs assets rose $101.46 billion during the same period. At the end of May 2013, assets of bond funds were $257.12 billion and hybrid funds were $1.32 billion.

Over the past 12 months, ETF assets rose $365.27 billion, or 32.7%.