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.
Overall, Vanguard is known for its low-cost and broadly diversified funds, offering several ETFs that analysts believe could benefit from favorable market trends in the year ahead. Investors can use the TipRanks Best Vanguard ETFs tool to explore other popular options.
Let’s break down these funds in detail.
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.
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.
