In a class by itself, Vanguard had ETF inflows in August

A record $17.5 billion was pulled from exchange-traded funds last month, but don't expect to see any sweat on the brows of the Vanguard crew. The Vanguard Group Inc. was the only company among the five largest ETF companies that had more money come in than go out for the month.

Investor confidence

Vanguard, the third-largest ETF company, had net inflows of $3.75 billion in August, according to IndexUniverse LLC. Investors' confidence in Vanguard shouldn't come as a surprise, given that the company has had only one month of companywide net outflows in the past 20 years. BlackRock Inc.'s iShares unit, the largest ETF company, had net outflows of $4.3 billion, mainly from investors' fleeing its bond ETFs. The $2.5 billion iShares Barclays 3-7 Year Treasury Bond ETF (IEI), for example, had $2.5 billion withdrawn for the month, the second-most withdrawals for any ETF. The $135 billion SPDR S&P 500 ETF (SPY) had a surprising $14 billion pulled from it in the month, more than reversing July's $13 billion in inflows. It led State Street Global Advisors, the second-biggest ETF company, to suffer more than $19 billion in outflows in total. The top three companies combined manage about 81% of the $1.4 trillion in ETF assets. Invesco PowerShares and WisdomTree Investments, the next-two-largest ETF companies, had net outflows of $807 million and $483 million, respectively. The $17.5 billion in net outflows from ETFs were the largest on record from the investment vehicles. The next largest, in January 2010, saw $17.1 billion withdrawn, according to BlackRock.