The Vanguard S&P 500 ETF (VOO) officially eclipsed $1 trillion in net asset value on June 2, 2026, making it the first exchange-traded fund in history to reach that milestone. The achievement underscores the immense success of passive index investing and Vanguard’s dominant role in reshaping how Americans invest in stocks.
The milestone is largely symbolic—ETFs don’t win prizes for reaching a particular size—but it reflects a seismic shift in the investment landscape. VOO has become the world’s largest ETF, surpassing rivals iShares Core S&P 500 ETF (IVV), which held just under $861 billion, and State Street SPDR S&P 500 ETF (SPY), which had almost $786 billion as of the same date, according to Morningstar.
VOO’s rise to dominance was swift and driven by a single factor: relentless inflows of new investor money. Between June 2021 and May 2026, the fund took in more than $400 billion in net new capital, according to Morningstar. By comparison, IVV attracted an estimated $250 billion and SPY received roughly $88 billion over the same period. In 2026 alone, through early June, VOO pulled in between $69 billion and $75 billion in inflows—more than any other ETF that year.
The fund’s explosive growth is rooted in its ultralow expense ratio. VOO charges just 0.03% annually, making it one of the cheapest ways to own the broad U.S. stock market. That fee advantage compounds over decades, giving investors a powerful reason to consolidate their holdings in a single fund. As the fund grew, its scale and popularity created a self-reinforcing cycle: more inflows brought lower costs, which attracted even more investors.
Five years earlier, the outcome would have seemed unlikely. In 2021, VOO held roughly $225 billion in assets and ranked third among the big three S&P 500 ETFs. SPY was the giant at the time with around $360 billion. The shift reflects a broader trend toward passive index investing and away from higher-cost competitors. Vanguard’s client-owned structure, which returns profits to its funds as lower fees, has become an increasingly attractive proposition for cost-conscious investors.
The fund’s parent mutual fund, the Vanguard 500 Index Fund, has deeper roots. Vanguard launched it on August 31, 1976, making it the first and oldest index-tracking mutual fund available to retail investors. The ETF is a share class of that original fund, which has now become a cornerstone of American investing. The $1 trillion milestone marks a generational achievement for an investment vehicle that revolutionized the industry by proving that investors could build wealth by simply tracking the market rather than trying to beat it.
Sources
- Morningstar — Confirmed VOO crossed $1 trillion on June 2, 2026; provided asset figures for IVV and SPY; detailed inflows from June 2021 to May 2026; confirmed 0.03% expense ratio
- InvestmentNews — Reported $69 billion in net inflows to VOO in 2026
- ETF Trends — Reported $75.69 billion in VOO inflows as of early June 2026
- Reuters — Confirmed VOO became the first ETF to top $1 trillion in assets
- Bloomberg — Reported a $1.7 billion single-day inflow that pushed VOO past the $1 trillion threshold
- Yahoo Finance — Confirmed VOO’s status as the largest ETF globally and first to reach $1 trillion
