For investors seeking low-cost U.S. stock market exposure, two Vanguard funds dominate the conversation: the Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX) and the Vanguard S&P 500 ETF (VOO). At first glance, choosing between a mutual fund and an ETF can feel confusing. Both give you broad exposure to the U.S. market, but they work differently when it comes to how you buy, trade, and manage them. Here, we compare both to help investors decide which option may be the better fit for their long-term portfolio.
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Let’s break down these funds in detail.
VTSAX or VOO: The Differences
The Vanguard S&P 500 ETF (VOO) is a popular choice for investors who want focused exposure to large U.S. companies. It tracks the S&P 500 (SPX), which is widely seen as a key benchmark for the U.S. stock market and overall economy.
On the other hand, Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX) is a mutual fund that offers broader exposure. It includes large-, mid-, and small-cap stocks by tracking the CRSP US Total Market Index, giving investors a more complete view of the U.S. market in a single fund.
There are also key structural differences. VTSAX requires a minimum investment of $3,000 when purchased directly through Vanguard, and trades once per day at its net asset value — making it better suited for long-term buy-and-hold investors. In contrast, VOO has no minimum investment beyond the price of a single share. It trades throughout the day like a stock, offering more flexibility for investors who prefer real-time buying and selling.
VOO and VTSAX: The Similarities
Both VOO and VTSAX are known for their extremely low fees. VOO has an expense ratio of 0.03%, while VTSAX is at 0.04%.
In terms of holdings, both funds look quite similar at the top, weighing heavily toward big tech names. Their top 5 holdings are Nvidia (NVDA), Apple (AAPL), Microsoft (MSFT), Amazon (AMZN), and Alphabet (GOOGL). VOO has about 36.3% of its portfolio in its top 10 holdings, while VTSAX is slightly lower at around 34.6%. Overall, VTSAX holds about 3,484 stocks with total assets of roughly $2.06 trillion. In comparison, VOO includes around 507 stocks with total assets of about $873.31 billion.
Finally, both have similar dividend yields. VTSAX has a dividend yield of about 1.12% and pays roughly $0.459 in quarterly dividends, while VOO has a very close yield of about 1.14%, also paid quarterly.
Conclusion
VTSAX covers the entire U.S. stock market, while VOO focuses only on the 500 largest companies in the S&P 500.
For investors, VTSAX is ideal if you prefer a mutual fund with automatic investments and end-of-day pricing, while VOO is better if you want ETF flexibility, intraday trading, and lower buy-in costs.