FFDKX vs. FXAIX
FFDKX (Fidelity Fund Class K) and FXAIX (Fidelity 500 Index Fund) are both mutual funds - FFDKX is a Large Cap Growth Equities fund managed by Fidelity, while FXAIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, FFDKX returned 15.58%/yr vs 15.18%/yr for FXAIX. Their 0.95 correlation means they have historically moved very closely together. FFDKX charges 0.38%/yr vs 0.02%/yr for FXAIX.
Performance
FFDKX vs. FXAIX - Performance Comparison
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Returns By Period
In the year-to-date period, FFDKX achieves a 7.70% return, which is significantly lower than FXAIX's 11.76% return. Both investments have delivered pretty close results over the past 10 years, with FFDKX having a 15.58% annualized return and FXAIX not far behind at 15.18%.
FFDKX
- 1D
- 2.04%
- 1M
- 4.06%
- 6M
- 6.89%
- YTD
- 7.70%
- 1Y
- 17.27%
- 3Y*
- 21.47%
- 5Y*
- 11.88%
- 10Y*
- 15.58%
- ALL TIME*
- 11.24%
FXAIX
- 1D
- 1.48%
- 1M
- 1.63%
- 6M
- 10.50%
- YTD
- 11.76%
- 1Y
- 21.49%
- 3Y*
- 20.87%
- 5Y*
- 13.14%
- 10Y*
- 15.18%
- ALL TIME*
- 14.04%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
FFDKX vs. FXAIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
FFDKX Fidelity Fund Class K | 7.70% | 20.13% | 27.24% | 31.03% | -25.81% | 33.32% | 26.55% | 33.57% | -5.23% | 23.35% |
FXAIX Fidelity 500 Index Fund | 11.76% | 17.84% | 25.01% | 26.29% | -18.14% | 28.71% | 18.42% | 31.48% | -4.43% | 21.82% |
Correlation
The correlation between FFDKX and FXAIX is 0.90, meaning they have usually moved in the same direction, including during past declines.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.90 |
Correlation (3Y) Balances recent behavior with more history. | 0.93 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.95 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.95 |
Correlation (All Time) Calculated using the full available price history since May 4, 2011 | 0.95 |
The correlation between FFDKX and FXAIX has been stable across timeframes, ranging from 0.90 to 0.95 - a consistent structural relationship.
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Return for Risk
FFDKX vs. FXAIX — Risk / Return Rank
FFDKX
FXAIX
FFDKX vs. FXAIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Fidelity Fund Class K (FFDKX) and Fidelity 500 Index Fund (FXAIX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| FFDKX | FXAIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.34 | ||
| Sortino ratioReturn per unit of downside risk | -0.39 | ||
| Omega ratioGain probability vs. loss probability | 1.26 | 1.33 | -0.07 |
| Calmar ratioReturn relative to maximum drawdown | 1.79 | 2.63 | -0.84 |
| Martin ratioReturn relative to average drawdown | 7.12 | 11.30 | -4.17 |
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Drawdowns
FFDKX vs. FXAIX - Drawdown Comparison
The maximum FFDKX drawdown since its inception was -52.66%, which is greater than FXAIX's maximum drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for FFDKX and FXAIX.
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Drawdown Indicators
| FFDKX | FXAIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -52.66% | -33.79% | -18.87% |
Max Drawdown (1Y)Largest decline over 1 year | -10.86% | -8.89% | -1.97% |
Max Drawdown (3Y)Largest decline over 3 years | -22.41% | -18.76% | -3.65% |
Max Drawdown (5Y)Largest decline over 5 years | -30.28% | -24.50% | -5.78% |
Max Drawdown (10Y)Largest decline over 10 years | -30.65% | -33.79% | +3.14% |
Current DrawdownCurrent decline from peak | 0.00% | 0.00% | 0.00% |
Average DrawdownAverage peak-to-trough decline | -8.14% | -3.77% | -4.37% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.72% | 2.07% | +0.65% |
Volatility
FFDKX vs. FXAIX - Volatility Comparison
Fidelity Fund Class K (FFDKX) and Fidelity 500 Index Fund (FXAIX) have volatilities of 3.94% and 3.81%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| FFDKX | FXAIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 3.94% | 3.81% | +0.13% |
Volatility (6M)Calculated over the trailing 6-month period | 10.08% | 10.20% | -0.12% |
Volatility (1Y)Calculated over the trailing 1-year period | 13.09% | 12.86% | +0.23% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 19.24% | 17.04% | +2.20% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 19.44% | 18.09% | +1.35% |
FFDKX vs. FXAIX - Expense Ratio Comparison
FFDKX has a 0.38% expense ratio, which is higher than FXAIX's 0.02% expense ratio.
Dividends
FFDKX vs. FXAIX - Dividend Comparison
FFDKX's dividend yield for the trailing twelve months is around 1.16%, more than FXAIX's 1.04% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FFDKX Fidelity Fund Class K | 1.16% | 1.25% | 0.00% | 2.48% | 0.74% | 4.67% | 2.77% | 5.49% | 7.51% | 11.18% | 7.12% | 5.60% |
FXAIX Fidelity 500 Index Fund | 1.04% | 1.11% | 1.25% | 1.45% | 1.69% | 1.22% | 1.60% | 2.06% | 2.72% | 1.97% | 2.52% | 2.83% |
Frequently Asked Questions
FFDKX and FXAIX have a correlation of 0.90, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
FFDKX has higher volatility (3.94%) compared to FXAIX (3.81%). In terms of maximum drawdown, FFDKX dropped -52.66% vs FXAIX's -33.79%.
FXAIX currently has the higher Sharpe Ratio (1.82 vs 1.49), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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