Compare/Updated Oct 26, 2026, refreshed every trading day
FDFIX vs FXAIX
Fidelity Flex 500 Index Fund against Fidelity 500 Index Fund: 4 years of returns, risk and today’s technical read, from Kavout’s own data.
FXAIX did slightly better over the period: $1,000 invested on October 28, 2022 would be worth $2,023 versus $2,014 in FDFIX, producing returns of 102.3% and 101.4%, respectively. FXAIX also led over 1 month, 6 months, YTD, 1 year, and 3 years, while the funds were tied over 3 months. The advantage was marginal: both declined 0.5% today, their daily-move correlation was 0.967, and FDFIX beat FXAIX in 25 of the last 48 months. FXAIX had slightly lower volatility over the last 12 months, 12.6% versus 12.7%. Both experienced the same worst drawdown of 19.0%, from February 19, 2025 to April 8, 2025. The results indicate nearly identical market exposure, with FXAIX delivering a small performance and volatility edge.
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Head to head
Which has returned more, FDFIX or FXAIX?
FDFIX beat FXAIX in 25 of the last 48 months; FXAIX won the other 23. The typical monthly gap was 0.02 points.
Total return by period
Which is riskier?
Both: Feb 19, 2025 to Apr 8, 2025
- 0.967
- correlation of daily moves, 4 years
- 1.01
- FDFIX move per 1% in FXAIX
- 0.989
- correlation, last 12 months
Month by month
Of the last 48 months. The typical gap was 0.02 points.
When did they diverge?
| Month | FDFIX | FXAIX | Gap |
|---|---|---|---|
| April 2025 | +4.5% | -1.0% | +5.50 pts |
| March 2025 | -10.6% | -5.6% | -4.97 pts |
| January 2026 | +1.2% | +1.4% | -0.25 pts |
| November 2025 | +0.1% | +0.2% | -0.18 pts |
Where the numbers come from. 1000 daily adjusted closes per fund from the Kavout market-data API, dividends included. Signals and indicators are Kavout’s own, refreshed nightly. Every figure is calculated from those adjusted closes.
Holdings and fees
What do you actually own with FDFIX and FXAIX?
- Price
- $32.40
- Price
- $264.99
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