ETF Flows Reach Record as Passive Share of U.S. Assets Crosses 20%

The exchange-traded fund industry reached another milestone in September, with global assets under management hitting $14.6 trillion and year-to-date inflows exceeding $1.1 trillion. At the current pace, 2026 will surpass the record set last year by a wide margin.

In the U.S., passive vehicles now hold 20.4% of domestic equity market capitalization, according to data compiled from Form 13F filings and fund reports. That is up from 15.8% five years ago and reflects both continued inflows and the market's concentration in mega-cap names that index funds must own.

"The concentration question is not new, but the numbers keep moving," said Angela Reidy, head of ETF research at Bridgeline Analytics. "When one in five dollars of the U.S. market is in funds that cannot vote with their feet, price discovery dynamics change."

Fixed-income ETFs have been the fastest-growing segment, with $287 billion of inflows year-to-date. Active fixed-income ETFs accounted for 42% of that total, up from 28% in the same period last year.

Crypto ETFs, thematic products, and single-stock leveraged funds continue to attract speculative flows. Buffered and defined-outcome ETFs have emerged as a surprising winner among advisors seeking to manage client sequence risk.

Fee compression remains a defining trend. The asset-weighted average expense ratio across U.S.-listed ETFs has fallen to 0.34%, and the largest core equity products charge as little as 0.03%.