FFDKX vs. FSKAX

Last updated Jun 4, 2026

FFDKX (Fidelity Fund Class K) and FSKAX (Fidelity Total Market Index Fund) are both mutual funds - FFDKX is a Large Cap Growth Equities fund managed by Fidelity, while FSKAX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 10 years, FFDKX returned 15.46%/yr vs 15.09%/yr for FSKAX. Their correlation of 0.95 suggests significant overlap in exposure. FFDKX charges 0.38%/yr vs 0.01%/yr for FSKAX.

Performance

FFDKX vs. FSKAX - Performance Comparison

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

Returns By Period

In the year-to-date period, FFDKX achieves a 3.69% return, which is significantly lower than FSKAX's 12.08% return. Both investments have delivered pretty close results over the past 10 years, with FFDKX having a 15.46% annualized return and FSKAX not far behind at 15.09%.

FFDKX

• 1D: -0.77%
• 1M: 2.04%
• YTD: 3.69%
• 6M: 4.50%
• 1Y: 23.32%
• 3Y*: 21.52%
• 5Y*: 13.37%
• 10Y*: 15.46%

FSKAX

• 1D: 0.24%
• 1M: 5.80%
• YTD: 12.08%
• 6M: 11.98%
• 1Y: 29.13%
• 3Y*: 22.42%
• 5Y*: 13.08%
• 10Y*: 15.09%

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

FFDKX vs. FSKAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FFDKX Fidelity Fund Class K	3.69%	20.13%	27.24%	31.03%	-25.81%	33.32%	26.55%	33.57%	-5.23%	23.35%
FSKAX Fidelity Total Market Index Fund	12.08%	17.06%	23.89%	26.12%	-19.53%	25.66%	20.79%	30.92%	-5.32%	20.85%

Correlation

The correlation between FFDKX and FSKAX is 0.92, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.94
Correlation (All Time) Calculated using the full available price history since Sep 9, 2011	0.95

The correlation between FFDKX and FSKAX has been stable across timeframes, ranging from 0.92 to 0.95 - a consistent structural relationship.

Return for Risk

FFDKX vs. FSKAX — Risk / Return Rank

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

FFDKX

FFDKX Risk / Return Rank: 41
FFDKX Sharpe Ratio Rank: 43
FFDKX Sortino Ratio Rank: 41
FFDKX Omega Ratio Rank: 41
FFDKX Calmar Ratio Rank: 34
FFDKX Martin Ratio Rank: 45

FSKAX

FSKAX Risk / Return Rank: 71
FSKAX Sharpe Ratio Rank: 71
FSKAX Sortino Ratio Rank: 64
FSKAX Omega Ratio Rank: 63
FSKAX Calmar Ratio Rank: 74
FSKAX Martin Ratio Rank: 82

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. FSKAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Fund Class K (FFDKX) and Fidelity Total Market Index Fund (FSKAX). 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	FSKAX	Difference
Sharpe ratio: Return per unit of total volatility	1.92	2.46	-0.54
Sortino ratio: Return per unit of downside risk	2.70	3.35	-0.64
Omega ratio: Gain probability vs. loss probability	1.34	1.44	-0.10
Calmar ratio: Return relative to maximum drawdown	2.22	3.38	-1.16
Martin ratio: Return relative to average drawdown	9.35	15.52	-6.17
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. FSKAX - Sharpe Ratio Comparison

The current FFDKX Sharpe Ratio is 1.92, which is comparable to the FSKAX Sharpe Ratio of 2.46. The chart below compares the historical Sharpe Ratios of FFDKX and FSKAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	FFDKX	FSKAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.92	2.46	-0.54
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.70	0.76	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.80	0.82	-0.02
Sharpe Ratio (All Time) Calculated using the full available price history	0.54	0.85	-0.31

Drawdowns

FFDKX vs. FSKAX - Drawdown Comparison

The maximum FFDKX drawdown since its inception was -52.66%, which is greater than FSKAX's maximum drawdown of -35.01%. Use the drawdown chart below to compare losses from any high point for FFDKX and FSKAX.

Drawdown Indicators

	FFDKX	FSKAX	Difference
Max Drawdown Largest peak-to-trough decline	-52.66%	-35.01%	-17.65%
Max Drawdown (1Y) Largest decline over 1 year	-10.86%	-8.92%	-1.94%
Max Drawdown (3Y) Largest decline over 3 years	-22.41%	-19.43%	-2.98%
Max Drawdown (5Y) Largest decline over 5 years	-30.28%	-25.39%	-4.89%
Max Drawdown (10Y) Largest decline over 10 years	-30.65%	-35.01%	+4.36%
Current Drawdown Current decline from peak	-0.77%	0.00%	-0.77%
Average Drawdown Average peak-to-trough decline	-8.20%	-4.02%	-4.18%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.56%	1.94%	+0.62%

Volatility

FFDKX vs. FSKAX - Volatility Comparison

The current volatility for Fidelity Fund Class K (FFDKX) is 2.81%, while Fidelity Total Market Index Fund (FSKAX) has a volatility of 2.97%. This indicates that FFDKX experiences smaller price fluctuations and is considered to be less risky than FSKAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FFDKX	FSKAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.81%	2.97%	-0.16%
Volatility (6M) Calculated over the trailing 6-month period	9.06%	9.23%	-0.17%
Volatility (1Y) Calculated over the trailing 1-year period	12.53%	12.26%	+0.27%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.17%	17.41%	+1.76%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.43%	18.46%	+0.97%

FFDKX vs. FSKAX - Expense Ratio Comparison

FFDKX has a 0.38% expense ratio, which is higher than FSKAX's 0.02% expense ratio.

Dividends

FFDKX vs. FSKAX - Dividend Comparison

FFDKX's dividend yield for the trailing twelve months is around 1.21%, more than FSKAX's 0.93% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FFDKX Fidelity Fund Class K	1.21%	1.25%	0.00%	2.48%	0.74%	4.67%	2.77%	5.49%	7.51%	11.18%	7.12%	5.60%
FSKAX Fidelity Total Market Index Fund	0.93%	1.01%	1.19%	1.41%	1.62%	1.15%	1.45%	1.94%	2.54%	2.07%	2.43%	0.82%

Frequently Asked Questions

Can I hold both FFDKX and FSKAX in my portfolio?

With a correlation of 0.92, FFDKX and FSKAX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, FFDKX or FSKAX?

FSKAX has higher volatility (2.97%) compared to FFDKX (2.81%). In terms of maximum drawdown, FFDKX dropped -52.66% vs FSKAX's -35.01%.

Which has better risk-adjusted returns?

FSKAX currently has the higher Sharpe Ratio (2.46 vs 1.92), 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.