Vanguard S&P 500 ETF sees record inflows of $13B in a single week

Vanguard’s S&P 500 ETF, ticker VOO, just vacuumed up roughly $13 billion in a single week, continuing a streak that has made it the undisputed king of the US ETF market.

The numbers behind the dominance

VOO became the first ETF in history to cross $1 trillion in assets under management back in June 2026. Year-to-date inflows through mid-2026 are estimated between $75 billion and $110 billion, the highest among all US-listed ETFs by a wide margin. In late August alone, VOO pulled in approximately $11.4 billion over a five-day stretch.

Early September kept the momentum going, with multiple single-day inflows ranging from roughly $2.99 billion to $3.28 billion.

Why VOO is eating everyone’s lunch

The explanation is deceptively simple: fees. VOO charges an expense ratio of 0.03%, which means investors pay $3 per year for every $10,000 invested. Its most famous competitor, State Street’s SPY, charges 0.09%, triple the cost for essentially identical exposure to the S&P 500.

While VOO has been inhaling capital, SPY and BlackRock’s IVV have experienced combined outflows totaling nearly $20 billion during the same period. SPY still has a structural advantage in the options market, where its deep liquidity makes it the preferred vehicle for hedging and trading. But for buy-and-hold investors, the math increasingly points in one direction: Vanguard.

The broader ETF boom

Overall US ETF inflows in 2026 are projected to exceed previous records, driven primarily by demand for equity products, particularly large-cap blend funds.

What this means for the fee war

SPY, which launched in 1993 as the first US-listed ETF, has been losing ground for years but remains a massive fund due to its trading volume and options ecosystem. IVV, BlackRock’s S&P 500 offering with an expense ratio of 0.03% matching VOO’s, hasn’t been able to keep pace either, suggesting that Vanguard’s brand loyalty and distribution advantages extend beyond raw pricing.

Vanguard’s mutual ownership structure, where fund shareholders effectively own the company, allows it to operate at razor-thin margins that publicly traded competitors struggle to match.

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