If that is in fact true, it would be accurate to say the iShares core ETFs have been effective. Indeed, Vanguard, the third-largest U.S. ETF, has proven to be a prodigious gatherer of assets. At the end of last year, Vanguard had $333.7 billion in ETF assets under management, compared to $661.5 billion for iShares, according to ETF.com data.

As of June 10, iShares had $715.9 billion in ETF assets compared to $379.8 billion, indicating the core suite has played a part in helping iShares maintain and grow market share.

“While the new Core ETFs will indeed have lower expense ratios than many similar ETFs, investors should be mindful that they might not offer the same exposure. For example, iShares Core US Growth, which will soon trade under the ticker IUSG, is currently under iShares Russell 3000 Growth (NYSEArca: IWZ). The expense ratio will change from 0.25% to 0.09%, which is of course a good thing for investors,” added S&P Capital IQ. [Big Additions to iShares Core Lineup]

 iShares Core MSCI Emerging Markets ETF

Tom Lydon’s clients own shares of EEM and IEMG.