The U.S. ETF industry enjoyed strong inflows over the course of October. Nevertheless, October 2026 delivered a sharp reminder that markets can rally and retreat for reasons far beyond the economic cycle. Geopolitical tension strained public finances and cautious central banks combined to weaken global equities while restoring the defensive appeal of high-quality government bonds.
The month’s dominant geopolitical force was the intensifying Middle East conflict. Renewed supply fears pushed Brent crude to $118 a barrel, raising inflation risks and squeezing the outlook for consumers and companies, particularly in energy-importing Europe. Energy shares benefited, but the oil shock reinforced expectations that interest rates would remain restrictive. The Russia-Ukraine war also kept energy security and defense spending high on Europe’s agenda, while trade friction between China and the European Union remained an additional threat to industrial activity.
Equity markets reflected this uneasy backdrop, as developed markets and emerging markets were falling. The correction was concentrated in technology and emerging Asia. Investors questioned whether enormous spending on artificial intelligence infrastructure would generate adequate returns, while higher financing costs exposed more leveraged companies. Korea and Taiwan suffered particularly steep losses. In contrast, energy and defensive sectors advanced, and the equal-weighted S&P 500 rose, showing that the sell-off in U.S. mega-cap technology masked broader resilience.
Fiscal policy produced another divide. Government spending on defense, infrastructure, and energy transition continued to support growth in Europe and the United States. Britain’s budget offered targeted relief from high energy costs while reaffirming fiscal rules, limiting disruption in gilts. France was the clear exception. Persistent deficits, rising debt, and political unrest widened the 10-year French bond spread over German bunds, leaving French sovereign debt outside the broader bond rally. In China, Beijing allocated unused local-government bond quotas to fourth quarter projects, seeking to offset weak investment and consumption without ignoring heavy local debt burdens.
Central banks chose caution rather than fresh tightening. The Federal Reserve held its policy range at 3.75% to 4.00% after September’s increase, as strong U.S. activity and elevated inflation argued against easing. The European Central Bank also stayed on hold, warning that expensive energy had lifted inflation even as the euro-area economy continued growing. The Bank of Japan maintained its overnight rate near 1.25%, despite declaring that underlying inflation had reached its 2% target and accelerated planned sales of its exchange-traded fund holdings.
Bonds ultimately benefited from risk aversion, as U.S., Japanese, German, and British government bonds all posted positive returns as yields retreated from September’s highs. October’s central lesson was therefore not simple risk-off trading, but discrimination: investors rewarded fiscal credibility, balance-sheet strength and defensive earnings, while punishing expensive technology, indebted issuers, and governments whose policy room looked increasingly narrow. With growth still resilient, October did not signal recession. It showed instead that geopolitics and debt sustainability had reclaimed pricing power, forcing monetary authorities and investors alike to weigh inflation protection against slowing risk appetite.
From a U.S. ETF industry perspective, the estimated net flows led, in combination with the performance of the underlying markets, to increasing assets under management (from $16,298.9 bn as of September 30, 2026, to $16,357.8 bn at the end of October). At a closer look, the increase in assets under management of $58.9 bn for October 2026 was driven by the performance of the underlying markets (-$136.2 bn), while the estimated net inflows added $195.1 bn to the increase of the assets under management.
Assets Under Management in the U.S. ETF Industry
As for the overall structure of the U.S. ETF industry, it was not surprising equity ETFs ($12,596.5 bn) held the majority of assets, followed by bond ETFs ($2,749.5 bn), alternatives ETFs ($626.2 bn), commodities ETFs ($318.7 bn), mixed-assets ETFs ($42.5 bn), and money market ETFs ($24.3 bn).
Graph 1: Market Share, Assets Under Management in the U.S. ETF Industry by Asset Type, October 31, 2026
Source: LSEG Lipper
Given the volatile and negative market environment over the course of the month, it was somewhat surprising that the overall assets under management in the U.S. ETF industry did not hit a new (month end) all-time high at the end of October 2026. When it comes to this, it is noteworthy that the assets under management for bond and mixed-assets ETFs reached a new (month end) all-time high at the end of October.
ETF Flows by Asset Type
The inflows in the U.S. ETF industry for October (+$195.1 bn overall) were driven by equity ETFs (+$104.0 bn), followed by bond ETFs (+$75.4 bn), alternatives ETFs (+$17.0 bn), mixed-assets ETFs (+$0.6 bn), and commodities ETFs (+$0.4 bn), while money market ETFs (-$2.4 bn) faced outflows.
Graph 2: Estimated Net Sales by Asset Type, October 1 – October 31, 2026 (USD Billions)
Source: LSEG Lipper
Given the market environment, it was surprising to see that equity ETFs enjoyed the highest estimated net inflows by such a wide margin over the course of October. That said, the strong inflows into bond ETFs may also be somewhat surprising, given the market environment over the course of September. When it comes to this, the fund flows by asset type may indicate that U.S. investors are in risk-on mode, as investors seem to bet on falling interest rates and a strong earnings season.
Assets Under Management by Lipper Global Classifications
In order to examine the U.S. ETF markets in further detail, a review of the Lipper global classifications will lead to more insights on the structure and concentration of assets within the U.S. ETF industry. At the end of October 2026, the U.S. ETF market was split into 136 different Lipper global classifications. The highest assets under management at the end of October were held by funds classified as Equity U.S. ($6,926.5 bn), followed by Equity Global ex U.S. ($1,316.3 bn), Equity U.S. Small & Mid Cap ($1,190.1 bn), Bond USD Medium Term ($720.6 bn), and Equity Sector Information Technology ($630.9 bn). These five classifications accounted for $10,784.4 bn, or 65.93%, of the overall assets under management in the U.S. ETF segment, while the 10-top classifications by assets under management accounted for $12,750.5 bn, or 77.95%.
Overall, 15 of the 136 peer groups each accounted for more than 1% of assets under management. In total, these 15 peer groups accounted for $13,790.6 bn, or 84.31%, of the overall assets under management.
Graph 3: Ten Largest Lipper Global Classifications by Assets Under Management, October 31, 2026 (USD Billions)
Source: LSEG Lipper
In addition, it was noteworthy that the rankings of the largest classifications saw some movement in single positions over the last few years. As the positions of the classifications had been quite stable in the past, this indicates that U.S. investors use ETFs to trade according to their market views. Even as some of these positions might be core holdings, once investors got into risk-off mode they also reduced their exposure to core asset classes.
Despite the fact that the rankings at the top of the table show some changes from time to time, these numbers show that the assets under management by Lipper global classifications continued to be highly concentrated in the U.S. ETF industry.
The peer groups on the other side of the table showed some ETFs in the U.S. ETF market are quite low in assets and their constituents may face the risk of being closed in the near future. They are obviously lacking investor interest and might, therefore, not be profitable for their respective ETF promoters.
Graph 4: Ten Smallest Lipper Global Classifications by Assets Under Management, October 31, 2026 (USD Billions)
Source: LSEG Lipper
ETF Flows by Lipper Global Classifications
The net inflows of the 10 best-selling Lipper classifications accounted for $149.5 bn. In line with the overall sales trend for October, equity peer groups (+$84.5 bn) led the flows by asset type on the table of the 10 best-selling Lipper global classifications by estimated net inflows. That said, it was somewhat surprising to see that the table of the 10 best-selling classifications for the month was equally split between bond and equity classifications (four each), while there were also two alternatives classifications on the table. When it comes to this, it was not surprising that Equity U.S. (+$55.8 bn) was the best-selling Lipper global classification for October, which might be seen as a sign that U.S. investors preferred U.S. equities in October, even as they were looking for diversification over the course of September. Bond USD Medium Term (+$17.2 bn) was the second best-selling classification, followed by Bond USD Municipal (+$16.2 bn), Equity Global ex U.S. (+$14.5 bn), and Bond USD Government Short Term (+$9.2 bn).
Graph 5: Ten Best- and Worst-Lipper Global Classifications by Estimated Net Sales, October 1 – October 31, 2026 (USD Billions)
Source: LSEG Lipper
More generally, these numbers showed the U.S. ETF segment is also highly concentrated when it comes to fund flows by classification—one would expect the flows into ETFs to be concentrated since investors often use ETFs to implement their market views and short-term asset allocation decisions. These products are made and, therefore, are easy to use for these purposes.
On the other side of the table, the 10 peer groups with the highest estimated net outflows for October 2026 accounted for $9.7 bn in outflows. These outflows were much lower than the outflow numbers for September (-$15.3 bn).
Money Market USD (-$2.4 bn) was the Lipper classification with the highest outflows for the month. It was bettered by Alternative Cryptocurrency (-$1.7 bn), Equity Sector Industrials (-$1.2 bn), Equity Sector Financials (-$1.1 bn), and Bond USD Mortgages (-$0.7 bn).
A view of the list of the 10 Lipper global classifications with the highest estimated net outflows indicates that U.S. investors may have reduced specific non-core risk in their portfolios, as they sold ETFs from non-core asset classes.
Assets Under Management by Promoters
A closer look at assets under management by promoters in the U.S. ETF industry also showed high concentration, with only 143 of the 521 ETF promoters in the U.S. holding assets at or above $1.0 bn, accounting for $16,281.3 bn, or 99.53%, of the overall assets under management in the U.S. ETF industry.
At the end of October, Vanguard ($4,663.9 bn) took the position as the largest ETF promoter in the U.S. from iShares ($4,632.4 bn). This was no surprise, as the two rivals were battling for the top spot since early 2026 and Vanguard enjoyed higher inflows over the course of the year so far. The two leaders had a comfortable lead as largest ETF promoters since they enjoy a wide margin over the third-largest ETF promoter in the U.S.—State Street SPDR ($2,126.0 bn).
Graph 6: The 10 Largest ETF Promoters by Assets Under Management, October 31, 2026 (USD Billions)
Source: LSEG Lipper
When it comes to this, it is noteworthy that Vanguard had overtaken iShares as leading ETF promoter by assets under management during June, but was unable to maintain that position until the end of the month. This shows that even the positions of the largest ETF promoters can become a subject of change over time.
The assets under management of the 10-top promoters accounted for $14,416.0 bn, or 88.13%, of the overall assets under management in the U.S. ETF industry. This meant, in turn, the other 511 ETF promoters registering at least one ETF for sale in the U.S. accounted for only 11.87% of the overall assets under management.
ETF Flows by Promoters
Since the U.S. ETF market is highly concentrated when it comes to assets under management by promoter, it was not surprising that seven of the 10 largest promoters by assets under management were among the 10-top selling ETF promoters for October. Vanguard (+$58.7 bn) was the best-selling ETF promoter in the U.S. for the month, ahead of iShares (+$38.6 bn) and State Street SPDR (+$18.8 bn).
Graph 7: Ten Best-Selling ETF Promoters, October 1 – October 31, 2026 (USD Billions)
Source: LSEG Lipper
The flows of the 10-top promoters accounted for estimated net inflows of $160.7 bn. As for the overall flow trend in October, it was clear that some of the 521 promoters (151) faced estimated net outflows (-$8.4 bn in total) over the course of the month.
Assets Under Management by ETFs
There were 5,808 instruments (primary share classes [5,709] and convenience share classes [99]) listed as ETFs registered for sales in the U.S. in the Lipper database at the end of October. Regarding the overall market pattern, it was not surprising assets under management at the ETF level were also highly concentrated. Only 1,061 of the 5,709 ETFs (primary share classes = portfolios) held assets more than $1.0 bn each. These ETFs accounted for $15,658.4 bn, or 95.72%, of the overall assets in the U.S. ETF industry. The 10 largest ETFs in the U.S. accounted for $4,879.8 bn, or 29.83%, of the overall assets under management.
Graph 8: The 10 Largest ETFs by Assets Under Management, October 31, 2026 (USD Billions)
Source: LSEG Lipper
With regard to assets under management at the ETF level, it is noteworthy that the Vanguard S&P 500 ETF (VOO) has passed the $1.0 trn milestone for the first time at the beginning of June 2026, but the ETF could not hold that level over the course of the month, as the ETF faced outflows over the course of the month. Nevertheless, VOO reached and maintained the level above $1.0 trn from July onwards and held $1,043.9 bn in assets under management at the end of October. To learn more about this, please read: Vanguard S&P 500 ETF (VOO) – The First ETF With More Than $1.0 trn in Assets Under Management.
Estimated Net Flows at ETF Level
A total of 4,278 of the 5,709 ETFs (primary share classes = portfolios) analyzed in this report showed net inflows of more than $10,000 each for October, accounting for inflows of $271.6 bn. This meant the other 1,431 instruments faced no flows, or net outflows, for the month. Upon closer inspection, 1,231 of the 4,278 ETFs posting net inflows enjoyed inflows of more than $100 m over the course of October—for a total of $266.8 bn. The best-selling ETF for October in the U.S. was Vanguard S&P 500 ETF, which enjoyed estimated net inflows of $23.3 bn. It was followed by State Street SPDR Portfolio S&P 500 ETF (+$9.7 bn) and iShares National Muni Bond ETF (+$6.3 bn).
Graph 9: The 10 Best-Selling ETFs, October 1 – October 31, 2026 (Euro Billions)
Source: LSEG Lipper
The flow pattern at the fund level indicated there was a lot of turnover and rotation during the month, but it also showed the concentration of the U.S. ETF industry even better than the statistics at the promoter or classification levels since the 10 best-selling ETFs account for $69.0 bn, or 35.38%, of the overall inflows.
Given its size and the overall trend for net sales at the promoter level, it was somewhat surprising that only two of the 10 best-selling ETFs for October were issued by Vanguard. These two ETFs were accounting for estimated net inflows of $28.0 bn. Meanwhile, iShares, the main competitor of Vanguard, issued four of the 10 best-selling ETFs in the U.S., which accounted for estimated net inflows of $17.5 bn.
This article is for information purposes only and does not constitute any investment advice.
The views expressed are the views of the author, not necessarily those of Lipper or LSEG.
