U.S. securities regulators have widened their inquiry into the trillion-dollar market for exchange-traded funds, according to a person familiar with the matter.

Prompted by a delay in a big trade at a popular ETF, the U.S. Securities and Exchange Commission is taking a closer look at a possible connection between high-frequency traders and hedge funds jumping in and out of ETFs, and instances where ETF trades fail to settle on time, this person said.

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