ETFs continue to grow so rapidly that they could overtake hedge funds in total assets under management by the end of the year, even though some people think of the US ETF market as having already matured. US ETF market growing at 15% annually “US ETF assets represent more than 70% of the global total,” writes Ernst and Young ETF leader and EMEIA asset manager Lisa Kealy. “But while annual growth may have slowed from its ten year average of more than 25%, the US market is still expected to expand by more than 15% annually – hardly a sign…