BlackRock’s (BLK) new iShares Core Series of exchange traded funds has gathered $2 billion in a month, according to a report.

“I would say, so far, very happy with the successes,” said BlackRock President Rob Kapito in a Reuters report.

Last month, BlackRock announced expense ratio cuts at several of its existing ETFs as it launched the iShares Core Series targeting buy-and-hold investors. [BlackRock Hits Back in ETF Fee War]

The series is comprised of six rebranded ETFs and four recently launched iShares.

In October, BlackRock rolled out iShares Core MSCI Total International Stock ETF (NYSEArca: IXUS), iShares Core MSCI Emerging Markets ETF (NYSEArca: IEMG), iShares Core MSCI EAFE ETF (NYSEArca: IEFA) and iShares Core Short-Term U.S. Bond ETF (NYSEArca: ISTB). [BlackRock Lists Four ‘Core’ iShares ETFs]

These ETFs round out the lineup: iShares Core S&P 500 ETF (NYSEArca IVV), iShares Core S&P Total U.S. Stock Market ETF (NYSEArca: ISI), iShares Core S&P Mid-Cap ETF (NYSEArca: IJH), iShares Core S&P Small-Cap ETF (NYSEArca: IJH), iShares Core Long-Term U.S. Bond ETF (NYSEArca: GLJ) and iShares Core Total U.S. Bond Market ETF (NYSEArca: AGG).

“Our goal is to continue to be the leading ETF provider in every region around the world. But being the global leader requires that we constantly adapt to meet changing client needs and to expand into new client segments,” BlackRock’s Kapito said during the firm’s most recent earnings call.

“So to be the leader in all development segments, we need to tailor products and services to different clients’ needs. Because investors that seek core portfolio products to buy and hold for the long term value price over other attributes, we have created a suite of products tailored just for them,” he added. [BlackRock ETF Fee Cuts Target Buy-and-Hold Investors]