FFDKX vs. FNILX

Last updated Apr 1, 2026

Compare and contrast key facts about Fidelity Fund Class K (FFDKX) and Fidelity ZERO Large Cap Index Fund (FNILX).

FFDKX is managed by Fidelity. It was launched on May 9, 2008. FNILX is managed by Fidelity.

Performance

FFDKX vs. FNILX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Fund Class K (FFDKX) and Fidelity ZERO Large Cap Index Fund (FNILX). The values are adjusted to include any dividend payments, if applicable.

FFDKX vs. FNILX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
FFDKX Fidelity Fund Class K	-9.34%	20.13%	27.24%	31.03%	-25.81%	33.32%	26.55%	33.57%	-15.07%
FNILX Fidelity ZERO Large Cap Index Fund	-7.30%	17.81%	25.47%	27.45%	-19.37%	26.67%	21.13%	31.79%	-13.60%

Returns By Period

In the year-to-date period, FFDKX achieves a -9.34% return, which is significantly lower than FNILX's -7.30% return.

FFDKX

• 1D: -0.04%
• 1M: -7.66%
• YTD: -9.34%
• 6M: -5.59%
• 1Y: 18.35%
• 3Y*: 18.39%
• 5Y*: 11.62%
• 10Y*: 14.18%

FNILX

• 1D: -0.35%
• 1M: -7.60%
• YTD: -7.30%
• 6M: -5.00%
• 1Y: 14.41%
• 3Y*: 17.43%
• 5Y*: 11.17%
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

FFDKX vs. FNILX - Expense Ratio Comparison

FFDKX has a 0.38% expense ratio, which is higher than FNILX's 0.00% expense ratio.

FFDKX

Fidelity Fund Class K

FNILX

Fidelity ZERO Large Cap Index Fund

Return for Risk

FFDKX vs. FNILX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FFDKX

FFDKX Risk / Return Rank: 52
FFDKX Sharpe Ratio Rank: 50
FFDKX Sortino Ratio Rank: 56
FFDKX Omega Ratio Rank: 58
FFDKX Calmar Ratio Rank: 46
FFDKX Martin Ratio Rank: 49

FNILX

FNILX Risk / Return Rank: 45
FNILX Sharpe Ratio Rank: 40
FNILX Sortino Ratio Rank: 44
FNILX Omega Ratio Rank: 49
FNILX Calmar Ratio Rank: 41
FNILX Martin Ratio Rank: 52

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

FFDKX vs. FNILX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Fund Class K (FFDKX) and Fidelity ZERO Large Cap Index Fund (FNILX). 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.

	FFDKX	FNILX	Difference
Sharpe ratio Return per unit of total volatility	0.96	0.83	+0.14
Sortino ratio Return per unit of downside risk	1.49	1.28	+0.21
Omega ratio Gain probability vs. loss probability	1.22	1.20	+0.03
Calmar ratio Return relative to maximum drawdown	1.14	1.04	+0.10
Martin ratio Return relative to average drawdown	4.83	5.01	-0.19
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FFDKX vs. FNILX - Sharpe Ratio Comparison

The current FFDKX Sharpe Ratio is 0.96, which is comparable to the FNILX Sharpe Ratio of 0.83. The chart below compares the historical Sharpe Ratios of FFDKX and FNILX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	FFDKX	FNILX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.96	0.83	+0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.65	-0.04
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.73	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.50	0.64	-0.13

Correlation

The correlation between FFDKX and FNILX is 0.95, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

FFDKX vs. FNILX - Dividend Comparison

FFDKX's dividend yield for the trailing twelve months is around 1.38%, more than FNILX's 1.09% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FFDKX Fidelity Fund Class K	1.38%	1.25%	0.00%	2.48%	0.74%	4.67%	2.77%	5.49%	7.51%	11.18%	7.12%	5.60%
FNILX Fidelity ZERO Large Cap Index Fund	1.09%	1.01%	1.09%	1.34%	1.53%	0.95%	1.20%	1.17%	0.53%	0.00%	0.00%	0.00%

Drawdowns

FFDKX vs. FNILX - Drawdown Comparison

The maximum FFDKX drawdown since its inception was -52.66%, which is greater than FNILX's maximum drawdown of -33.76%. Use the drawdown chart below to compare losses from any high point for FFDKX and FNILX.

Drawdown Indicators

	FFDKX	FNILX	Difference
Max Drawdown Largest peak-to-trough decline	-52.66%	-33.76%	-18.90%
Max Drawdown (1Y) Largest decline over 1 year	-12.00%	-12.18%	+0.18%
Max Drawdown (5Y) Largest decline over 5 years	-30.28%	-25.40%	-4.88%
Max Drawdown (10Y) Largest decline over 10 years	-30.65%	—	—
Current Drawdown Current decline from peak	-10.86%	-9.01%	-1.85%
Average Drawdown Average peak-to-trough decline	-8.27%	-5.47%	-2.80%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.04%	2.54%	+0.50%

Volatility

FFDKX vs. FNILX - Volatility Comparison

Fidelity Fund Class K (FFDKX) and Fidelity ZERO Large Cap Index Fund (FNILX) have volatilities of 4.37% and 4.23%, 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.

Volatility by Period

	FFDKX	FNILX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.37%	4.23%	+0.14%
Volatility (6M) Calculated over the trailing 6-month period	9.23%	9.14%	+0.09%
Volatility (1Y) Calculated over the trailing 1-year period	19.32%	18.26%	+1.06%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.20%	17.22%	+1.98%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.39%	20.17%	-0.78%