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Total Market Index Funds Explained
Total market index funds track the entire US stock market — including large, mid, and small-cap companies — offering broader diversification than an S&P 500-only fund in a single investment.
Total Market vs. S&P 500
| Factor | Total Market Fund | S&P 500 Fund |
|---|---|---|
| Coverage | ~3,500-4,000 companies | 500 largest companies |
| Includes small/mid-cap | Yes | No |
| Historical performance | Very similar to S&P 500 | Very similar to total market |
Popular Total Market Funds
Vanguard Total Stock Market ETF (VTI) and Fidelity ZERO Total Market Index (FZROX) are among the most widely held total market options, both offering extremely low costs.
Simplicity as a Feature
A single total market fund can serve as the entire US equity portion of a portfolio, simplifying investment decisions while still capturing the full breadth of the US stock market in one holding.
Common Mistakes
Assuming total market and S&P 500 funds perform dramatically differently — historically, their returns have been quite similar given the S&P 500's dominant weight within the total market.
Frequently Asked Questions
Neither is definitively "better" — total market funds offer marginally broader diversification, but historical performance between the two has been quite similar.
Yes — a total market fund alone provides comprehensive US stock exposure across company sizes, though you'd still want to consider international and bond exposure for full portfolio diversification.