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.

Subscribe Now

Access to authoritative analysis and perspective and our data-driven report series.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.