Fidelity Index Funds: List, Differences & How to Choose

Fidelity Index Funds: What You Are Comparing

Fidelity index funds include mutual funds that follow broad stock-market indexes and other benchmarks. They sit alongside Fidelity's actively managed mutual funds and its separate ETF lineup.

The format and the strategy are separate decisions. A mutual fund can follow an index. An ETF can use an active strategy. That distinction matters because investors sometimes use “index fund” and “ETF” as though they mean the same thing.

FXAIX, FSKAX, and FZROX are mutual funds. They do not trade intraday like ETFs.

Choose the account and portfolio role before the ticker. A Roth IRA is an account with tax rules; an index mutual fund is an investment that can potentially be held inside it. The fund issuer manages the investment, while the brokerage provides account access.

Fidelity Index Funds: Selected Funds and Research Categories

Use the searchable table to narrow the research list by format or exposure. Named tickers are examples, not recommendations. This is a selected educational list rather than Fidelity's complete catalog. Check the official Fidelity fund page and current prospectus before making an investment decision.

FXAIX vs. FSKAX: Large Companies or the Broader Market?

FXAIX follows the S&P 500. Its portfolio focuses on large U.S. companies.

FSKAX is designed to provide broader U.S. stock-market coverage, including companies outside the S&P 500.

The two funds therefore answer slightly different portfolio questions. Holding both can repeat much of the large-company allocation because the biggest U.S. stocks make up substantial portions of both.

Compare the benchmark, company-size exposure, holdings, and existing portfolio before deciding whether both are necessary. The useful question is not which ticker performed better last year. It is whether you want large-cap U.S. exposure or broader U.S. market exposure.

Fidelity ZERO Funds: Check Access and Portability

Fidelity's ZERO funds attract attention because of their zero expense ratios. That is a legitimate cost advantage, but an expense ratio is only one part of fund selection.

FZROX, for example, is a Fidelity mutual fund designed for broad U.S. stock exposure. Before buying it, especially in a taxable brokerage account, review what happens if you later move your account to another brokerage.

If a receiving brokerage cannot hold a particular proprietary mutual fund, a transfer may require the investor to sell it first. In a taxable account, selling an appreciated position can create a capital-gain tax consequence.

Fidelity ETFs Are a Separate Comparison

Fidelity's ETF lineup includes equity, bond, sector, factor, and actively managed strategies.

An ETF issued by Fidelity should not automatically be treated as the ETF version of one of Fidelity's index mutual funds. Compare the actual investment mandate and holdings.

FBND, for example, is a Fidelity bond ETF with an active investment approach. Its portfolio role should be compared with other bond strategies, not treated as an ETF equivalent of FXAIX, FSKAX, or FZROX.

A Fidelity brokerage account can also hold ETFs issued by other companies. Choosing Fidelity as the brokerage therefore does not require using only Fidelity-managed ETFs.

A Practical Fidelity Index Fund Comparison

Suppose a household wants broad U.S. stock exposure, plans to invest $200 each month, and values simple automatic investing.

FSKAX and FZROX could both become research candidates for that particular role.

The household should compare: market coverage, fund methodology, current expenses, automation, account access, and whether a future brokerage transfer is likely.

FXAIX would answer a somewhat different question because it focuses on companies in the S&P 500 rather than trying to represent the broader U.S. stock market.

If the investor expects to remain at Fidelity indefinitely, portability may be less important. If brokerage flexibility matters, it deserves more weight in the decision.

Compare Costs Without Changing the Investment Question

Compare funds with similar exposures before allowing the expense ratio to determine the choice.

The expense ratio is an annual percentage charged inside the fund. It is not generally a separate monthly bill.

For a hypothetical $10,000 balance, a 0.05% annual expense ratio is about $5, while a 0.50% expense ratio is about $50, before changes in the investment balance.

These are educational examples rather than quoted expenses for the Fidelity funds discussed on this page.

Also consider: transaction costs, account-level fees, advisory fees, tax consequences, transfer restrictions, and ETF bid-ask spreads where applicable.

A zero fund expense ratio does not eliminate market risk, tax consequences, or every other potential cost.

Fidelity Mistakes Worth Catching

• Calling Fidelity ZERO funds ETFs when they are mutual funds.
• Adding FXAIX to a total-market fund merely to own another ticker.
• Assuming a zero expense ratio automatically makes FZROX the best choice for every investor.
• Ignoring portability before buying a proprietary fund in a taxable account.
• Assuming Fidelity ETFs use the same investment strategy as Fidelity index mutual funds.
• Confusing the Fidelity brokerage platform with Fidelity-managed investments.

Your Fidelity Fund Research Checklist

1. Define the portfolio role before choosing the fund.
2. Record the exact fund name and ticker.
3. Confirm whether it is a mutual fund or ETF.
4. Review the index or investment mandate.
5. Compare company-size and geographic coverage.
6. Review holdings and overlap with funds already owned.
7. Compare current fund expenses.
8. Check minimums and recurring-investment options.
9. Review transfer and portability rules.
10. Consider taxes before selling or transferring taxable holdings.

Keep the checklist with your account notes so future reviews use the same criteria. Diversification can reduce concentration risk, but it cannot guarantee a profit or prevent market losses.

Build the Allocation Before Picking the Brand

Fidelity, Vanguard, Schwab, and other fund companies provide investment products. The brand itself is not a complete portfolio.

Decide the amount of U.S. stocks, international stocks, bonds, and other exposure that fits the goal first. Then compare funds designed to fill those roles.

Use asset allocation for beginners to define the mix, the diversification guide to check concentration, and the investment fee calculator to test recurring cost assumptions.

Compare other ETF and mutual fund companies when you want to research another provider for the same portfolio role.

When the Broader Fidelity Guide Is More Useful

This page focuses specifically on Fidelity index funds, including FXAIX, FSKAX, Fidelity ZERO funds, portability, and the distinction between those mutual funds and Fidelity ETFs.

Use the Fidelity mutual funds and ETFs guide when you want the broader existing Fidelity overview across multiple fund types.