Though technical issues with Bank of New York Mellon's fund accounting system left an estimated 10% of U.S. ETFs and some mutual fund providers unable to accurately price their products for nearly a week, the bank's custody business is expected to remain intact.

One reason why, says Morningstar analyst Erin Davis, is because BNY Mellon didn't cause the problem - the InvestOne fund accounting platform, provided by Sungard Data Systems, went down on Aug. 22 because of "an unforeseen complication resulting from an operating system change performed by SunGard," according to the technology firm.

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