VOO holds the exact same portfolio as VFIAX but skips the $3,000 minimum and the ~$75 fee Fidelity charges to buy it.
NVDA and AAPL top both funds' identical holdings, with one-year returns differing by just 0.03% between VOO and VFIAX.
Vanguard allows a one-way, tax-free conversion from VFIAX to VOO in taxable accounts, but selling elsewhere triggers capital gains on any appreciation.
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Owning Vanguard 500 Index Fund Admiral Shares (NASDAQ:VFIAX) is one of the most common ways American investors hold the S&P 500. The Admiral share class delivers low-cost index exposure, and Vanguard's brand loyalty runs deep enough that many holders have never questioned whether the mutual fund wrapper still makes sense. But for readers who already own VFIAX or are about to buy it, there is a cheaper share class of the exact same portfolio sitting one ticker away, removing two frictions the Admiral share class imposes.
That alternative is Vanguard S&P 500 ETF (NYSEARCA:VOO), the same fund in ETF form.
At rock-bottom cost, VFIAX tracks the S&P 500, with top holdings that read like the index itself: NVIDIA, Apple, Alphabet, Microsoft, Amazon, Broadcom, Meta, Tesla, Berkshire Hathaway, and JPMorgan Chase. The Admiral share class carries a stated expense ratio of 0.04%, pays quarterly dividends, and offers the operational convenience of mutual fund mechanics: you buy in dollar amounts, dividends are reinvested automatically at NAV, and there is no bid-ask spread to contend with. For investors making regular contributions inside a Vanguard account, that workflow proves particularly useful.
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The first is the entry ticket. VFIAX carries a $3,000 minimum initial investment. For a new investor or someone opening a second account, that is a real barrier. It also means that partial rollovers or small IRA contributions cannot be credited to VFIAX until the balance exceeds the threshold.
The second is where you hold it. Vanguard mutual funds are not always free to trade at competing brokerages. Fidelity, for instance, charges roughly $75 to buy non-Fidelity mutual funds like VFIAX. On a $10,000 purchase, that is a 0.75% upfront hit before the fund earns a cent. Schwab and other platforms apply similar transaction fees on Vanguard mutual funds. If you do not custody at Vanguard, VFIAX is meaningfully more expensive to accumulate than the sticker expense ratio suggests.
The same underlying Vanguard 500 Index Fund sits behind both VOO and VFIAX, with identical holdings, the same index, and identical portfolio management. What differs is the wrapper, and with that difference come three things a holder actually feels in practice.
The expense ratio on VOO is 0.03% versus VFIAX's 0.04%. A single basis point sounds trivial, and on $10,000, it is about a dollar a year. On a $500,000 balance held for 20 years, the compound effect is worth noticing. On the minimum investment side, VOO has none beyond the price of one share, currently $707.38. Fractional-share brokers cut that further. The $3,000 gate disappears.
On brokerage costs, ETFs trade commission-free at essentially every major U.S. broker. The ~$75 Fidelity transaction fee that applies to VFIAX does not apply to VOO. That is the largest and most immediate savings for anyone who does not custody at Vanguard.
The performance numbers confirm the equivalence. Year to date through August 6, VOO returned 13.33% while VFIAX returned 13.36%. Over one year, VOO delivered 22.89% against VFIAX's 22.92%. Trailing dividends are effectively identical as well, with VOO paying $7.3456 per share over the past 12 months and VFIAX paying $7.3376 per share.
ETFs trade at market price, not NAV, so intraday spreads exist. On VOO, with average daily volume well into the millions of shares, spreads are typically a penny or two, immaterial for a buy-and-hold investor. Automatic dollar-based contributions are cleaner in a mutual fund, though fractional ETF trading has narrowed that gap.