The Vanguard S&P 500 Index ETF Just Became the Second ETF to Surpass $1 Trillion in Assets

2026-06-04 09:13:36 ET

The headline news is that Vanguard S&P 500 Index ETF (NYSEMKT:VOO) has surpassed $1 trillion in assets. That's a big number, but what does it really mean for the exchange-traded fund (ETF)? Here's a look at how Vanguard S&P 500 Index ETF got so big and what investors really need to care about when looking at this ETF. (Hint: The size of the ETF isn't what's most important.)

Before getting to Vanguard S&P 500 Index ETF, you need to know about the S&P 500 index (SNPINDEX:^GSPC) . The S&P 500 index is meant to track the broader U.S. economy. It contains roughly 500 stocks selected by a committee. The selected companies are generally large and economically important. A market-cap-weighted system is used, so the largest companies have the greatest impact on the index's performance, both on the upside and the downside.

Generally speaking, the S&P 500 has become the de facto representation of "the market." It is actually a fairly well-constructed index, though the market-cap-weighted approach often leads to unbalanced sector weightings. For example, today's strong technology sector has pushed this single sector to 35% of the index, nearly three times the size of the next closest sector (financials at 12%). The lofty valuations in the tech sector, meanwhile, have pushed the S&P 500's average price-to-earnings ratio to a fairly high 27.4x.

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