Vanguard’s S&P 500 ETF, known by the ticker VOO, became the first exchange-traded fund in history to surpass $1 trillion in assets under management on June 2, 2026. The milestone was punctuated by roughly $1.7 billion in single-day inflows, a figure that says less about one good Tuesday and more about a structural shift in how people invest.
To put $1 trillion in perspective, that’s larger than the GDP of most countries. One fund, tracking one index, charging investors 0.03% annually.
How VOO ate the ETF world
VOO launched on September 7, 2010, entering a market already dominated by State Street’s SPDR S&P 500 ETF, better known as SPY. SPY had nearly two decades of head start, having debuted in 1993 as the first US-listed ETF.
That changed in February 2025, when VOO overtook SPY as the largest ETF on the planet. The reason was elegantly simple: cost.
