The U.S. ETF industry enjoyed very strong inflows over the course of August. These inflows occurred in an environment in which global equities advanced, although the rally became less assured as the month progressed. Strong corporate earnings and continued spending on artificial intelligence infrastructure supported risk appetite, while renewed Middle East tensions, higher energy prices, and hawkish central bank signals kept bond markets unsettled.
Geopolitics remained a source of uncertainty. Fighting involving the United States and Iran kept Brent crude near $90 a barrel and raised fresh concerns about supplies passing through the Strait of Hormuz. European natural gas prices also reached their highest level of the year amid low inventories and damage to energy infrastructure in Russia and the Middle East. These pressures supported energy shares but complicated the inflation outlook for oil importing economies.
In the United States, monetary policy produced the month’s sharpest change in sentiment. The Federal Reserve did not hold a policy meeting in August, leaving its target range at 3.50% to 3.75%. At the Jackson Hole symposium, however, Chair Kevin Warsh stressed the importance of price stability and questioned the usefulness of extensive forward guidance. Investors interpreted his remarks as reducing the likelihood of rate cuts and increasing the risk of another rate increase. Short-term Treasury yields moved higher and the yield curve flattened.
Fiscal policy also influenced U.S. bonds. The U.S. Treasury announced plans to expand buybacks of longer-dated government debt to support market liquidity. The purchases provided some technical support but did not remove concerns about heavy issuance and rising debt-servicing costs. The 10-year Treasury yield ended August at about 4.75%, leaving most fixed-income sectors under pressure.
The European Central Bank (ECB) also had no rate setting meeting during August. Minutes from its July meeting showed that policymakers remained concerned about the persistence of the energy shock. Longer-dated oil and gas prices stayed above pre-conflict levels, while inflation expectations rose when crude rebounded. Defense and infrastructure spending supported eurozone activity but also strengthened the argument for keeping monetary policy restrictive. Euro-area inflation reached 3.3% in August.
The Bank of Japan (BoJ) maintained the policy stance adopted in July, targeting an overnight rate of around 1%. Expectations of further policy normalization restrained demand for Japanese government bonds as officials monitored the effects of higher imported energy costs and the weaker yen. Government measures designed to reduce household energy bills helped limit immediate inflation pressures.
Equity investors were more willing than bondholders to look beyond these risks. Healthy earnings revived demand for semiconductor, software, and cloud-computing companies after July’s selloff. Gains also extended beyond technology, with energy and materials benefiting from higher commodity prices. Emerging market equities slightly outperformed developed markets, supported by Asian technology companies and a softer dollar.
August ended with contrasting signals. Equity prices reflected confidence in profits, AI investment, and economic resilience. Bond yields pointed to a less comfortable combination of persistent inflation, geopolitical risk, substantial government borrowing, and central banks unwilling to ease policy quickly.
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 $15,786.0 bn as of July 31, 2026, to $16,394.9 bn at the end of August). At a closer look, the increase in assets under management of $608.9 bn for August 2026 was driven by the performance of the underlying markets (+$432.7 bn), while the estimated net inflows added another $176.3 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 ($12,687.4 bn) held the majority of assets, followed by bond ETFs ($2,645.0 bn), alternatives ETFs ($629.9 bn), commodities ETFs ($366.5 bn), mixed-assets ETFs ($39.8 bn), and money market ETFs ($26.4 bn).
Graph 1: Market Share, Assets Under Management in the U.S. ETF Industry by Asset Type, August 31, 2026
Source: LSEG Lipper
Given the volatile but positive market environment over the course of the month, it is not surprising that the overall assets under management in the U.S. ETF industry hit a new (month end) all-time high at the end of August 2026. When it comes to this, it is noteworthy that the assets under management for alternatives, bond, equities, and mixed-assets ETFs reached a new (month end) all-time high at the end of August.
ETF Flows by Asset Type
The inflows in the U.S. ETF industry for August (+$176.3 bn overall) were driven by equity ETFs (+$94.0 bn), followed by bond ETFs (+$55.8 bn), alternatives ETFs (+$12.3 bn), commodities ETFs (+$11.0 bn), money market ETFs (+$2.1 bn), and mixed-assets ETFs (+$0.9 bn).
Graph 2: Estimated Net Sales by Asset Type, August 1 – August 31, 2026 (USD Billions)
Source: LSEG Lipper
Given the market environment, it was in line with expectations to see that equity ETFs enjoyed the highest estimated net inflows over the course of August. That said, it was not surprising to see that U.S. investors bought money market ETFs in this market environment, since money market is considered a safe haven investment which might be used to replace (short-term) bond funds.
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 August 2026, the U.S. ETF market was split into 137 different Lipper global classifications. The highest assets under management at the end of August were held by funds classified as Equity U.S. ($6,930.4 bn), followed by Equity Global ex U.S. ($1,333.8 bn), Equity U.S. Small & Mid Cap ($1,182.9 bn), Bond USD Medium Term ($658.3 bn), and Equity Sector Information Technology ($654.2 bn). These five classifications accounted for 65.63% of the overall assets under management in the U.S. ETF segment, while the 10-top classifications by assets under management accounted for 78.02%.
Overall, 15 of the 137 peer groups each accounted for more than 1% of assets under management. In total, these 15 peer groups accounted for $13,803.4 bn, or 84.19%, of the overall assets under management.
Graph 3: Ten Largest Lipper Global Classifications by Assets Under Management, August 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 funds 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, August 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 $142.8 bn. In line with the overall sales trend for August, equity peer groups (+$89.0 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 split between four equity, three bond, two alternatives, and one commodities classifications. When it comes to this, it was not surprising that Equity U.S. (+$62.0 bn) was the best-selling Lipper global classification for August, which might be an additional sign that U.S. investors are further in risk-on mode despite some market volatility. Bond USD Government Short Term (+$16.0 bn) was the second best-selling classification, followed by Equity Global ex U.S. (+$13.9 bn), Commodities Precious Metals (+$9.2 bn), and Bond USD Medium Term (+$8.1 bn).
Graph 5: Ten Best- and Worst-Lipper Global Classifications by Estimated Net Sales, August 1 – August 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 August 2026 accounted for $14.3 bn in outflows. These outflows were higher than the outflow numbers for July (-$10.4 bn).
Equity Sector Financials (-$4.7 bn) was the Lipper classification with the highest outflows for the month. It was bettered by Equity Sector Information Technology (-$3.2 bn), Alternative Equity Leveraged (-$2.4 bn), Equity Theme Natural Resources (-$1.0 bn), and Equity Brazil (-$0.9 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 the overall risk in their portfolios, as they sold alternative assets and non-core equities.
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 142 of the 512 ETF promoters in the U.S. holding assets at or above $1.0 bn, accounting for $16,318.8 bn. The largest ETF promoter in the U.S.—iShares ($4,689.3 bn)—accounted for 28.60% of the overall assets under management. Despite a comfortable lead as largest ETF promoter globally, iShares is closely followed by Vanguard ($4,682.9 bn), the number-two ETF promoter in the U.S. That said, the two largest ETF promoters in the U.S. have a comfortable lead over the number-three promoter—State Street SPDR ($2,155.3 bn).
Graph 6: The 10 Largest ETF Promoters by Assets Under Management, August 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 not able 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 $14,454.7 bn, or 88.71%, of the overall assets under management in the U.S. ETF industry. This meant, in turn, the other 502 ETF promoters registering at least one ETF for sale in the U.S. accounted for only 11.83% 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 nine of the 10 largest promoters by assets under management were among the 10-top selling ETF promoters for August. Vanguard (+$52.2 bn) was the best-selling ETF promoter in the U.S. for the month, ahead of Invesco (+$24.0 bn) and iShares (+$20.7 bn).
Graph 7: Ten Best-Selling ETF Promoters, August 1 – August 31, 2026 (USD Billions)
Source: LSEG Lipper
The flows of the 10-top promoters accounted for estimated net inflows of $136.1 bn. As for the overall flow trend in August, it was clear that some of the 512 promoters (96) faced estimated net outflows (-$1.4 bn in total) over the course of the month.
Assets Under Management by ETFs
There were 5,682 instruments (primary share classes [5,598] and convenience share classes [84]) listed as ETFs registered for sales in the U.S. in the Lipper database at the end of August. Regarding the overall market pattern, it was not surprising assets under management at the ETF level were also highly concentrated. Only 1,051 of the 5,598 ETFs (primary share classes = portfolios) held assets more than $1.0 bn each. These ETFs accounted for $15,700.2 bn, or 95.76%, of the overall assets in the U.S. ETF industry. The 10 largest ETFs in the U.S. accounted for $4,946.8 bn, or 30.17%, of the overall assets under management.
Graph 8: The 10 Largest ETFs by Assets Under Management, August 31, 2026 (USD Billions)
Source: LSEG Lipper
With regard to assets under management at the ETF level it is noteworthy that the Vanguard 500 Index Fund; 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. 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 2,959 of the 5,598 ETFs (primary share classes = portfolios) analyzed in this report showed net inflows of more than $10,000 each for August, accounting for inflows of $255.8 bn. This meant the other 2,639 instruments faced no flows, or net outflows, for the month. Upon closer inspection, 370 of the 2,959 ETFs posting net inflows enjoyed inflows of more than $100 m over the course of August—for a total of $218.4 bn. The best-selling ETF for August in the U.S. was Vanguard S&P 500 ETF, which enjoyed estimated net inflows of $24.3 bn. It was followed by Invesco QQQ Trust, Series 1 (+$17.1 bn) and iShares 0-3 Month Treasury Bond ETF (+$6.0 bn).
Graph 9: The 10 Best-Selling ETFs, August 1 – August 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 $79.9 bn, or 45.35%, of the overall inflows.
Given its size and the overall trend for net sales at the promoter level, it was surprising that only two of the 10 best-selling funds for August were issued by iShares, accounting for estimated net inflows of $11.4 bn. Meanwhile, iShares’ main competitor Vanguard issued three of the 10 best-selling ETFs in the U.S., which accounted for estimated net inflows of $34.3 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 LSEG.
