The Vanguard S&P 500 ETF officially crossed $1 trillion in assets under management this week, becoming the first exchange-traded fund in history to reach that threshold.
The ETF, trading under the ticker VOO, pulled in $69 billion in net inflows since the start of 2026. That includes a single trading session in which it attracted $1.7 billion in a single trading session, according to data compiled by Bloomberg.
In line with Vanguard's low-cost calling card, the fund charges an expense ratio of just 0.03%, or $3 for every $10,000 invested — a fee structure that has made it the go-to vehicle for advisors and retail investors seeking broad, low-cost exposure to US equities.
"This is a key milestone," Todd Rosenbluth, head of research at VettaFi, said in comments reported by Reuters. "Investors continue to turn to low-cost broad-market exposure to gain access to the S&P 500 using VOO."
The Vanguard S&P 500 ETF overtook State Street Global Advisors' SPDR S&P 500 ETF Trust (SPY) – the fund that effectively launched the US ETF industry when it debuted in January 1993 – less than 18 months before hitting the trillion-dollar mark, according to Vanguard. BlackRock's iShares Core S&P 500 ETF (IVV) held approximately $860 billion in assets, while SPY stood at roughly $786 billion at the time of the milestone.
VOO's rise is less a story about one fund and more a story about how people have come to invest. The fund tracks the S&P 500, following a passive strategy first popularized by Vanguard founder Jack Bogle over three decades ago.
VOO crossed the threshold having quadrupled in size since 2022, driven by sustained investor demand for low-cost index-tracking products and exposure to large-cap US stocks that have benefited from the artificial intelligence boom.
The S&P 500 index has posted a cumulative gain of approximately 11% year-to-date, repeatedly setting fresh all-time highs along the way. Stock market appreciation has done a lot of the heavy lifting, but analysts have also pointed to strong inflows boosting the fund's asset base.
According to Morningstar analyst Daniel Sotiroff, VOO at one point stood at third place among the big three S&P 500 ETF, with just $225 billion in assets three years ago. Since then, it has overtaken SPY and IVV, breaking the tape in the race to become the first-ever trillion-dollar ETF.
"Investors added more than $400 billion of new money to Vanguard S&P 500 ETF between June 2021 and May 2026, while the iShares and State Street ETFs took in an estimated $250 billion and $88 billion, respectively," Sotiroff said in a note breaking down the achievement.
Exchange-traded funds worldwide held nearly $22 trillion in assets as of the end of April, more than tripling from approximately $6.4 trillion at the beginning of 2020. The industry has also experienced more than six consecutive years of monthly net inflows, mostly if not entirely at the expense of mutual funds.
Vanguard's unique ownership structure – the firm is owned by its funds and, by extension, its investors – has long allowed it to operate without the pressure to maximize shareholder profit that constrains publicly traded rivals such as BlackRock and State Street. That structure enables Vanguard to keep reducing costs in ways that publicly traded competitors find structurally difficult to match.
Together, the VOO ETF and its companion mutual fund share class now hold approximately $1.6 trillion in assets, making it one of the largest investment vehicles in the world.
Some market participants argue that the growing concentration of assets in passive index funds could distort broader market dynamics, particularly as mega-cap technology companies continue to dominate the S&P 500.
Industry observers also note that upcoming initial public offerings from companies such as SpaceX and Anthropic, combined with potential changes to accelerated index inclusion rules, could attract substantial passive capital and benefit funds like VOO.
Meanwhile, the active ETF segment continues to expand rapidly. Active ETFs worldwide held nearly $1.8 trillion in assets at the end of 2025 and delivered an organic growth rate of 53% that year, according to data from Morningstar and Goldman Sachs Asset Management.
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