FXAIX: How the Fidelity 500 Index Fund Fits in a Portfolio

"FXAIX exists to be a core holding. It replicates the S&P 500, meaning you own roughly proportional slices of the 500 largest U.S. companies, weighted by market cap. The return engine is simple: capital appreciation from those underlying companies, plus reinvested dividends from the index, minus a sliver for fund expenses. There are no options overlays, no factor tilts, no manager picking winners. The fund's published expense ratio of 0.015% sits among the lowest in the industry, which means almost every dollar of index return flows through to shareholders."

"For a Fidelity brokerage or 401(k) participant, FXAIX is often the path of least resistance to S&P 500 exposure. It trades at NAV once a day, has no bid/ask spread, and accepts dollar-based purchases down to the penny, which makes it well suited for automated payroll contributions and dividend reinvestment."

"The strategy is only useful if the tracking is tight. By that test, FXAIX delivers. Over the past year, the fund returned about 30%, while SPDR S&P 500 ETF Trust ( NYSEARCA:SPY | SPY Price Prediction) returned about 28% over the same window. Five-year total return for FXAIX came in around 86%, and the ten-year figure landed near 318%."

"The gap versus SPY's 252% ten-year price return is largely explained by FXAIX's adjusted figures including reinvested dividends, while SPY's price-only series strips them out. FXAIX has hugged the index almo"

FXAIX is a Fidelity mutual fund designed to serve as a core holding by tracking the S&P 500. It provides diversified large-cap U.S. equity exposure by owning proportional slices of the 500 largest companies, weighted by market capitalization. Returns come from capital appreciation of those companies and reinvested dividends from the index, reduced by fund expenses. The fund has a very low published expense ratio of 0.015%, with no options overlays, factor tilts, or manager stock selection. It trades at NAV once per day, has no bid/ask spread, and supports dollar-based purchases down to the penny, fitting automated contributions and dividend reinvestment. Performance shows close alignment with S&P 500 benchmarks, with differences explained by dividend reinvestment and return calculation methods.

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