The Vanguard S&P 500 ETF (VOO) has become the first exchange-traded fund in history to surpass $1 trillion in assets under management, a milestone reached this week that underscores the enduring appeal of low-cost passive investing. The fund, which tracks the S&P 500 index, has attracted $69 billion in net inflows since the start of 2026, including a single session where it pulled in $1.7 billion, according to Bloomberg data.
VOO charges an expense ratio of 0.03%, or $3 per $10,000 invested, a fee structure that has made it a staple for financial advisors and retail investors seeking broad U.S. equity exposure. This low-cost advantage has been a key driver, as noted by Todd Rosenbluth, head of research at VettaFi, who told Reuters that investors continue to turn to such products for efficient market access.
The fund overtook State Street Global Advisors' SPDR S&P 500 ETF Trust (SPY), which launched the U.S. ETF industry in January 1993, less than 18 months before hitting the trillion-dollar mark. As of the milestone, BlackRock's iShares Core S&P 500 ETF (IVV) held approximately $860 billion, while SPY stood at roughly $786 billion. VOO's rise has been dramatic: it quadrupled in size since 2022, driven by sustained demand for index-tracking products and exposure to large-cap U.S. stocks buoyed by the artificial intelligence boom.
The S&P 500 index has posted a cumulative gain of about 11% year-to-date, repeatedly setting fresh all-time highs. Market appreciation has contributed significantly, but analysts also highlight strong inflows. Morningstar analyst Daniel Sotiroff noted that VOO stood at third place among the big three S&P 500 ETFs three years ago, with just $225 billion in assets. Since then, it has overtaken SPY and IVV, with investors adding more than $400 billion of new money to VOO between June 2021 and May 2026, compared to $250 billion for IVV and $88 billion for SPY.
Industry-wide, 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 start of 2020. The sector has experienced over six consecutive years of monthly net inflows, largely at the expense of mutual funds. Vanguard's unique ownership structure—owned by its funds and, by extension, its investors—allows it to operate without the pressure to maximize shareholder profit, enabling it to keep reducing costs in ways that publicly traded rivals like BlackRock and State Street 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 globally. This growth has implications for advisors managing retirement assets, as discussed in IRA Assets Hit $18 Trillion as Rollovers Drive 39% Share of U.S. Retirement Market, highlighting the shift toward passive strategies in retirement planning.
Some market participants argue that the growing concentration of assets in passive index funds could distort market dynamics, particularly as mega-cap technology companies dominate the S&P 500. Upcoming initial public offerings from firms like 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, with active ETFs worldwide holding nearly $1.8 trillion in assets at the end of 2025 and delivering an organic growth rate of 53% that year, according to Morningstar and Goldman Sachs Asset Management data.
For advisors, the milestone reinforces the importance of low-cost index strategies in portfolio construction, as highlighted in Vanguard Research: Retirees Need Income Strategy, Not Just Savings Target. The trend also aligns with broader market developments, such as the Cerebras IPO Surges 68% on Nasdaq, Valuing AI Chipmaker at $95 Billion; SK Hynix Nears $1 Trillion, which underscores the AI-driven market gains that have boosted VOO's performance.
