Vanguard VOO Becomes First ETF to Surpass $1 Trillion in Assets
Claire Weston
Vanguard's S&P 500 ETF — VOO — crossed $1 trillion in assets this week, becoming the first exchange-traded fund ever to reach that threshold; trillion-dollar passive money is now rewriting the rules from fee wars to IPO pricing.
How did one fund reach a trillion dollars?
VOO has nearly tripled in size since 2022 and overtook State Street's SPY (now $788 billion) in February to become the world's largest ETF.
This means → in just over three years, a single fund went from "very large" to "unprecedented" — the speed itself is a mirror of how fast passive investing is accelerating.
BlackRock's IVV ($857 billion) sits in second place, SPY in third. All three track the S&P 500; the differences come down to fees and brand.
A fee gap of a few hundredths of a percent — why does it still move hundreds of billions?
VOO charges 0.03% a year, matching IVV. SPY charges 0.0945% — a gap of less than 0.07 percentage points.
In plain terms = on $10,000, that's under $7 a year. Scale it to hundreds of billions and stretch it over a decade, and those few dollars compound into billions of lost returns.
ETFGI managing partner Deborah Fuhr noted that VOO has pulled in over $60 billion in net inflows year-to-date: "Even at very low fee levels, investor sensitivity to cost remains significant."
This reflects a passive-investing industry now in an extreme phase — competing on fractions of a basis point — where fees are the single hardest driver of asset flows.
How big is the global passive pool now?
As of end-April, global ETFs held $21.9 trillion in assets, more than tripling from $6.4 trillion at the start of 2020 — with 83 consecutive months of net inflows.
This means → for nearly seven years, not a single month saw net redemptions — regardless of whether markets rose or fell, money kept flowing one way into passive vehicles.
RBC markets strategist Mike Bell attributes this to "an almost one-directional shift of capital from active to passive over the past decade."
How does trillion-dollar passive money reshape IPO pricing?
Index-tracking funds must automatically buy index constituents. Once SpaceX, Anthropic, or OpenAI list and join the S&P 500, they will trigger tens of billions of dollars in mandatory passive buying.
SpaceX is discussing a funding round at a $1.75 trillion valuation, raising roughly $75 billion; Anthropic is preparing an IPO valued at over $1 trillion; OpenAI, recently valued at $852 billion, plans to file listing materials soon.
In plain terms = once these companies enter the S&P 500, funds like VOO must buy — regardless of price. The buying is compulsory, not discretionary.
Research Affiliates founder Rob Arnott says he plans to subscribe to the SpaceX IPO despite viewing the valuation as stretched, precisely because of this forced-buying effect: "Passive funds are forced to buy at the post-IPO price, and that price may already be inflated by anticipated index inclusion."
Are the rules for joining the S&P 500 changing too?
S&P Dow Jones Indices last week completed a consultation proposing to cut the waiting period for new stocks to enter the S&P 500 from 12 months to 6.
This means → if approved, the window between a mega-IPO listing and triggering trillions in passive buying shrinks by half — pricing distortions could arrive faster and hit harder.
Who could catch VOO?
Strategas chief ETF strategist Todd Sohn sees BlackRock's IVV as the only ETF with a realistic chance of overtaking VOO, mainly through BlackRock's larger model-portfolio business.
VOO plus its sister mutual fund together hold $1.6 trillion, making it the world's second-largest investment fund, behind only Vanguard's Total Stock Market fund ($2.2 trillion across ETF and mutual fund).
TMX VettaFi head of research Todd Rosenbluth sums it up: "ETFs have become the ultimate tool for U.S. equity exposure, and VOO is one of the largest and cheapest options available."
Content is for reference only, not financial advice.