FXIAX vs. VOO: Which Fund Should You Choose?

When it comes to low cost mutual funds, the two names that are always in the conversation are Vanguard and Fidelity.

And when it comes to low cost index funds, the index everyone talks about is the S&P 500.

These are some of the most popular index funds at either company.

At Vanguard, it’s the Vanguard’s S&P 500 ETF (VOO).

At Fidelity, it’s the S&P 500 Index Fund (FXIAX).

But of the two, which fund should you choose for your portfolio?

The choice isn’t an easy one because the funds are nearly identical. Each one tracks the performance of the S&P 500 index and is part of a major investment fund family, offering incredibly low expense ratios. Meanwhile, the performance differences between the two are practically invisible.

Either fund is an excellent choice to represent the S&P 500 portion of your portfolio. Even so, breaking down both funds will help you identify small differences that might make one more attractive than the other.

Table of Contents
  1. Fidelity S&P 500 Fund vs Vanguard S&P 500 Fund
  2. FXIAX vs. VOO: A Head-to-Head Comparison
  3. Holdings
    1. FXIAX
    2. VOO
  4. Performance
  5. FXIAX vs. VOO: Which Is Better?
  6. Is There an FAIAX Performance Advantage?
  7. Final Thoughts

🔃UPDATED: Updated the market prices, 52-week highs/lows, and yields of both funds in the table.

Fidelity S&P 500 Fund vs Vanguard S&P 500 Fund

As stated in the introduction, both the Fidelity S&P 500 Index Fund (FXIAX) and the Vanguard S&P 500 ETF (VOO) are index funds that track the performance of the S&P 500 index. But while the VOO is an exchange-traded fund (ETF), the FXIAX is a mutual fund.

Generally speaking, mutual funds are actively traded funds in which the fund manager attempts to outperform the general market by trading securities, often frequently. That leads to higher management expense ratios (MERs) since buying and selling shares involve fees. Therefore, ETFs are generally preferable to mutual funds due to their lower operating expenses.

But this is not the case with FXIAX. Even though it’s a mutual fund, it has very low expense ratios. In fact, the MER for FXIAX is lower than it is for VOO. 

Note: While S&P 500 index funds are well diversified across the general US stock market, they are limited to the American market only. If you want to add international companies to your portfolio, you’ll need funds specializing in that market sector.

In addition, if you want more concentration on specific business sectors, like technology, healthcare, or energy, you’ll need to take positions in funds that specialize in those industries. The S&P 500 is mostly a general investment fund that avoids specialization and any one sector.

FXIAX vs. VOO: A Head-to-Head Comparison

The table below compares the basic features of FXIAX and VOO.

Not surprisingly, there are more similarities than differences between the two funds.

Fund / FeatureFXIAXVOO
Asset ClassDomestic Stock – GeneralDomestic Stock – General
CategoryLarge BlendLarge Blend
When Launched2/17/198809/07/2010
Expense Ratio0.015%0.03%
Market Price (as of 1/11/2023)$137.70$363.49
52-week High / Low Price$166.37 / $124.13$439.25 / $327.68
Total Net Assets$372.75 billion$789.6 billion
Number of Stocks505503
Dividend DistributionQuarterlyQuarterly
Dividend Yield (Trailing)1.69%1.69%

Let’s now take a closer look at the two funds to see where there may be any differences, however slight they may be.



The industry distribution of the FXIAX is as follows: information technology (26.24%), healthcare (15.30%), financials (11.37%), consumer discretionary (10.85%), and industrials (8.25%).

The ten largest holdings in the FXIAX fund, which represent 26.4% of total net assets, include:

  1. Apple Inc.
  2. Microsoft Corp
  3. Amazon.com Inc.
  4. Tesla Inc. 
  5. Alphabet Inc CL A (GOOGL)
  6. Berkshire Hathaway Inc.
  7. UnitedHealth Group Inc.
  8. Alphabet Inc CL C (GOOG)
  9. Exxon Mobil Corp
  10. Johnson & Johnson


The industry distribution of the VOO is as follows: information technology (26.4%), healthcare (15.2%), financials (11.60%), consumer discretionary (10.40%), and industrials (8.40%).

The ten largest holdings in the VOO fund, which represent 25.1% of total net assets, include:

  1. Apple Inc.
  2. Microsoft Corp.
  3. Amazon.com Inc.
  4. Alphabet Inc. CL A (GOOGL)
  5. Berkshire Hathaway Inc.
  6. Alphabet Inc. CL C (GOOG)
  7. Tesla Inc. 
  8. UnitedHealth Group Inc.
  9. Johnson & Johnson
  10. Exxon Mobil Corp. 

Notice that while there are slight differences in the rank of each company in each portfolio, as well as small differences in the sector percentages held in each, these funds have essentially the same composition.

Perhaps the biggest difference between the two is that while the VOO holds 503 stocks – matching the S&P 500 index – the FXIAX includes 505.


Below are screenshots of the 1-year, 3-year, 5-year, 10-year, and since inception performances of both funds (through November 30, 2022), according to Fidelity and Vanguard.



Now let’s look at the performances side-by-side to better compare the returns on each through 11/30/2022.

Fund / Performance PeriodFXIAXVOO
Since Inception
(inception date)
(since 2/17/1988)
(since 09/07/2010)

Once again, the performance between the two funds is very nearly identical. But while VOO has a slightly better one-year performance, FXIAX outperformed VOO over the three-, five-, and 10-year timeframes. This could be more significant than VOO’s superior one-year performance because funds represent a longer-term investment. By that count, FXIAX looks to be the better-performing fund.

The better long-term performance can be partially explained by the lower expense ratio of FXIAX. It’s 0.015% per year, vs. 0.03% for the VOO. Though that small difference in the expense ratios may seem insignificant, it can add up over time, especially when your investment time horizon stretches over several decades.  

VOO does stand out as the better performer since inception, and by a wide margin – more than 3% per year. But that difference is mainly explained by the more recent start date of the fund. Since the VOO began in 2010 – shortly after the 2008 Financial Meltdown – it avoided that market’s negative impact. The FXIAX, by contrast, experienced the total weight of that bear market – in addition to the 2000 – 2002 Dot-com bust.

Related Post: VOO vs. SPY

FXIAX vs. VOO: Which Is Better?

As you can see from the side-by-side comparison, the difference between the FXIAX and the VOO is minimal. Both are index funds tracking the same index and performing well against that index. Either will represent a worthy allocation of the S&P 500 index.

FXIAX shows a consistent pattern of slightly higher returns over the longer term, or at least through the most recent ten years. But VOO has been weathering the 2022 downturn a little better, which can’t be ignored either.

Is There an FAIAX Performance Advantage?

What should we make of the better performance of the FXIAX fund over three and 10-year periods? Someone who invests based mostly on the numbers might declare the slightly better performance of the FXIAX – especially in light of its lower annual expense ratio – to be the obvious choice. After all, even though the difference is minimal, it does add up as the years’ pass.

But as is usually the case, that slightly better performance and lower expense ratio isn’t the whole story.

The distinction that FXIAX is a mutual fund and VOO is an ETF is more critical than it seems on the surface.

It all has to do with investment brokerage commission fee structures. The best online brokers today offer commission-free buying and selling of ETFs. The same is not true for mutual funds. Most brokers charge between $10 and $50 per trade on mutual funds.

That may not matter much if you’re purchasing a substantial position in a mutual fund like FXIAX. But in smaller amounts, it can be significant. For example, a $30 purchase commission equals 3% of a $1,000 mutual fund investment. That fee will not apply to an ETF.

The situation becomes even more pronounced if you intend to trade funds, even infrequently. If you do, ETFs – like VOO – are the clear winner. Depending on the platform, you’ll pay no commissions to buy and no commissions to sell.

Final Thoughts

I can think of one workaround that places FXIAX on more equal footing with VOO.

Fidelity Investments is not only the provider of the FXIAX (and many other funds) but is also a popular investment brokerage firm. If you purchase FXIAX or any Fidelity-sponsored mutual fund, you can trade the fund commission-free by opening a brokerage account with that firm. 

In that case, the FXIAX fund may be an equal choice.

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About Kevin Mercadante

Since 2009, Kevin Mercadante has been sharing his journey from a washed-up mortgage loan officer emerging from the Financial Meltdown as a contract/self-employed "slash worker" – accountant/blogger/freelance blog writer – on OutofYourRut.com. He offers career strategies, from dealing with under-employment to transitioning into self-employment, and provides "Alt-retirement strategies" for the vast majority who won’t retire to the beach as millionaires.

He also frequently discusses the big-picture trends that are putting the squeeze on the bottom 90%, offering workarounds and expense cutting tips to help readers carve out more money to save in their budgets – a.k.a., breaking the "savings barrier" and transitioning from debtor to saver.

Kevin has a B.S. in Accounting and Finance from Montclair State University.

Opinions expressed here are the author's alone, not those of any bank or financial institution. This content has not been reviewed, approved or otherwise endorsed by any of these entities.

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