Key takeaways
Vanguard’s VOO took $27.54bn of net new money in August 2026 and closed the month at $1.05trn — 16.5% of the US top-20 ETF market on its own.
iShares’ IVV lost $11.18bn and State Street’s SPY $4.61bn. Two S&P 500 trackers gave back $15.8bn in the same month a third took $27.5bn.
Vanguard is now $1.4bn behind iShares in US ETF assets — $4.693trn against $4.695trn — and out-gathering it by almost three to one.
iShares holds 40.9% of European top-20 issuer assets, four times Xtrackers in second place.
Crypto is the most concentrated segment in the market. iShares accounts for 50.7% of top-20 crypto ETF assets and 76% of the segment’s net August inflows.
The world’s 20 largest ETF issuers held $18.93trn at the end of August 2026, and Vanguard led net flows with $67.22bn, ahead of iShares on $37.26bn and Invesco on $28.66bn. Beneath those three numbers, August tells four distinct stories: a three-way split in S&P 500 trackers, a US asset race that is now within rounding distance, a European market that keeps consolidating, and a crypto segment held by a single issuer.
Concentration is the backdrop to all of it. iShares, Vanguard and SPDR together hold 72.2% of global top-20 issuer assets, and the twenty largest ETF products in the world hold $6.46trn between them. In a market this top-heavy, a single product’s flow number moves the league table.
VOO, IVV and SPY track the same index. In August they went in opposite directions. VOO took $27.54bn. IVV lost $11.18bn. SPY lost $4.61bn.
Cost is the usual explanation — VOO charges 3 basis points against SPY’s 9 — but it does not account for IVV, which competes with VOO on price. What is left is distribution and habit. VOO has become the default ticker for US large-cap beta, and default tickers compound.
The rest of the US top 20 was broadly positive. QQQ added $16.94bn, VTI $7.61bn, GLD $5.42bn and SPYM $5.30bn. Only six of the twenty lost money, and outside IVV and SPY the largest outflow was XLK at $1.31bn.
The gap matters beyond the three tickers. VOO now holds $1.05trn against IVV’s $886.7bn and SPY’s $814.6bn — 16.5%, 13.9% and 12.8% of the US top-20 universe. A year of flows at August’s rate would put real daylight between first and second place in a segment the market has treated as interchangeable for a decade.
Figure 1: Net new money by ticker, US top 20 ETFs, August 2026. Source: Ultumus ETF analytics.
In the US top-20 issuer universe, iShares holds $4,694.5bn and Vanguard $4,693.1bn — a gap of $1.43bn, or 30.53% of the market against 30.52%. August flows were not close: Vanguard $58.95bn, iShares $21.13bn. On that pace the ranking changes within weeks.
Globally iShares remains comfortably ahead, $6.28trn to $5.06trn. The difference is Europe, where iShares holds $1.51trn against Vanguard’s $302.7bn.
| Issuer | Global AUM | Share | August net flow |
| iShares | $6.28trn | 33.2% | +$37.26bn |
| Vanguard | $5.06trn | 26.7% | +$67.22bn |
| SPDR | $2.32trn | 12.3% | +$4.93bn |
| Invesco | $1.21trn | 6.4% | +$28.66bn |
| Schwab | $619.8bn | 3.3% | +$9.78bn |
| Xtrackers | $410.9bn | 2.2% | +$6.20bn |
| JPMorgan | $409.5bn | 2.2% | +$7.89bn |
| Dimensional | $319.8bn | 1.7% | +$3.68bn |
| Amundi | $309.2bn | 1.6% | +$4.13bn |
Table 1: Largest ETF issuers by assets, global top-20 universe, 31 August 2026. Share is of the $18.93trn top-20 total.
Europe’s top 20 issuers held $3.68trn, and iShares took $15.57bn of August’s flows — more than Vanguard ($7.00bn) and Xtrackers ($5.42bn) combined. Invesco added $4.74bn and Amundi $4.13bn. Concentration runs to the product level too: CSP1 and IWDA between them hold 35.6% of European top-20 ETF assets. The largest single European inflow was VWRA at $3.34bn, with gold tracker SGLD adding $1.54bn.
Asia, at $673bn across its top 20 issuers, split cleanly. Korea and Taiwan gathered: Mirae Asset $1.76bn, Cathay $1.20bn, Samsung KODEX $1.10bn. Greater China paid out: CSOP lost $981m, ChinaAMC $788m and the Tracker Fund of Hong Kong $505m.
| Asset class | Top-20 AUM | Largest inflow | Most concentrated |
| Equity | $15.34trn | Vanguard +$50.13bn | iShares 30.9% |
| Fixed income | $3.03trn | iShares +$18.30bn | iShares 43.5% |
| Commodities | $457.3bn | SPDR +$5.46bn | SPDR 33.8% |
| Crypto | $138.5bn | iShares +$4.37bn | iShares 50.7% |
Table 2: Global top-20 universes by asset class, 31 August 2026.
Two points stand out. SPDR was the largest gainer in commodities on gold demand while shedding $3.67bn from its equity book — the same firm, opposite directions. And iShares now holds more than half of top-20 crypto ETF assets, a share no issuer holds in any other asset class.
Equity took the headlines, but August’s second story was bonds. The global fixed income top 20 held $3.03trn, and iShares and Vanguard took $34.97bn of the month’s flow between them — $18.30bn and $16.67bn. Behind them the field was tight: JPMorgan $3.55bn, Schwab $3.22bn, SPDR $3.16bn, PGIM $1.77bn and PIMCO $1.74bn. iShares holds 43.5% of the segment, its strongest position in any asset class outside crypto.
Gold ran through the month on both sides of the Atlantic. GLD added $5.42bn in the US and SGLD $1.54bn in Europe, and SPDR took $5.46bn of the $457.3bn global commodities segment. Invesco followed with $2.27bn, iShares $1.65bn and Amundi $1.38bn. The largest commodity outflow was Legal & General at $963m.
The 20 largest active ETF issuers held $1.73trn. Dimensional ($307.0bn) and JPMorgan ($305.3bn) hold 35.5% of it between them. August flows were led by American Century at $7.06bn, then JPMorgan $6.34bn, iShares $5.38bn and Capital Group $5.14bn.
At product level the largest active inflow was AVLV at $3.44bn — an American Century fund, which is where most of that issuer’s $7.06bn came from. The largest active ETF by assets remains DFAC at $49.4bn.