Since their creation in 1993, exchange-traded funds reaped their greatest monthly inflows in November, taking in $25.12 billion, according to data from the Investment Company Institute. By last count, they had $288.95 billion in assets.

Equity ETFs took in the lion's share of those flows, rising by $24.49 billion in the month. Of that, $17.54 billion went to domestic equity ETFs and $6.95 billion in international equity ETFs. Bond ETFs took in $626 million.

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