WASHINGTON — The Investment Company Institute, the mutual fund industry trade group, has begun reporting monthly net flows for exchange-traded funds.

An exchange-traded fund tracks a select number of stocks — much as an index fund does — and trades on stock exchanges at market-determined prices. The largest such fund is the Nasdaq’s $24 billion-asset QQQ Fund, an index of the exchange’s top securities, said John Jacobs, head of Nasdaq’s financial products group.

Assets held in exchange-traded funds at yearend were reported to have risen 16.1% from two months earlier, to $65.6 billion.

Broad-based domestic exchange-traded funds held $58.1 billion, and sector funds accounted for $5.3 billion of that. Global funds held $2 billion, the institute said.

The first report was issued Thursday.

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