The world's largest mutual fund company pulled in more than 90% of the more than $15 billion that investors poured into U.S.-listed ETFs in Q1, adding fuel to the fire of fund managers and providers who fear Vanguard becoming too big.

According to new data from Analytics, between those flows and the S&P 500 Index's 1.81% increase in the quarter, ETF assets rose to $1.736 trillion. That was up 2% from the end of the last year and up almost 20% from the end of 2013's first quarter, according to data compiled by The analysis also showed that Vanguard - with $2.4 trillion in assets under management and roughly half of those in indexed products - is close to moving up one notch to the No. 2 spot on's ranking of issuer flows (see below). It has total ETF assets of $351 billion, compared with $379 billion for State Street Global Advisors, which is currently the second biggest ETF company in the world. According to, Vanguard's continued success at marketing its "pure beta" capitalization-weighted index strategies will no doubt create additional pressures on an ETF industry that is already intensely focused on keeping costs low, says.

"I think it is remarkable that Vanguard is on the verge of passing State Street in terms of total ETF assets under management," says Brian Bush of Stephens Inc. Capital Management. "State Street and Barclays, now BlackRock, were the early leaders in the ETF industry, and as a late arrival, Vanguard made a name for itself by offering significantly lower management fees in its ETFs." Bush explains that other providers have since lowered their fees in response, but Vanguard has secured its position as the 'low cost provider' in the market and continues to reap the benefits.

The three most popular ETFs in the first quarter were all from Vanguard. As outlined by, they were: 1) Vanguard FTSE Europe ETF, with inflows of $2.3 billion 2) Vanguard REIT ETF, with inflows of $1.90 billion 3) Vanguard FTSE Developed Markets ETF, with inflows of $1.86 billion

"Vanguard will continue to gain market share but the fund industry will remain a fragmented industry for some time to come - it will not be like Apple and Samsung dominating the smart phone market," financial planner Allan Roth tells me. "For now, though, Vanguard is taking advantage of investors getting the fact that costs matter."

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