FKMCX vs. FSMAX

Last updated Apr 1, 2026

Compare and contrast key facts about Fidelity Mid-Cap Stock Fund Class K (FKMCX) and Fidelity Extended Market Index Fund (FSMAX).

FKMCX is managed by Fidelity. It was launched on May 9, 2008. FSMAX is managed by Fidelity.

Performance

FKMCX vs. FSMAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Mid-Cap Stock Fund Class K (FKMCX) and Fidelity Extended Market Index Fund (FSMAX). The values are adjusted to include any dividend payments, if applicable.

FKMCX vs. FSMAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FKMCX Fidelity Mid-Cap Stock Fund Class K	1.48%	11.87%	14.65%	11.11%	-6.30%	28.72%	11.56%	25.50%	-10.21%	18.03%
FSMAX Fidelity Extended Market Index Fund	-4.54%	11.40%	16.99%	25.36%	-26.44%	12.41%	32.28%	28.01%	-9.44%	18.04%

Returns By Period

In the year-to-date period, FKMCX achieves a 1.48% return, which is significantly higher than FSMAX's -4.54% return. Over the past 10 years, FKMCX has outperformed FSMAX with an annualized return of 11.29%, while FSMAX has yielded a comparatively lower 10.54% annualized return.

FKMCX

• 1D: -1.38%
• 1M: -7.64%
• YTD: 1.48%
• 6M: 4.69%
• 1Y: 20.51%
• 3Y*: 12.61%
• 5Y*: 8.71%
• 10Y*: 11.29%

FSMAX

• 1D: -1.03%
• 1M: -7.76%
• YTD: -4.54%
• 6M: -4.39%
• 1Y: 16.77%
• 3Y*: 13.78%
• 5Y*: 3.66%
• 10Y*: 10.54%

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

FKMCX vs. FSMAX - Expense Ratio Comparison

FKMCX has a 0.76% expense ratio, which is higher than FSMAX's 0.04% expense ratio.

FKMCX

Fidelity Mid-Cap Stock Fund Class K

FSMAX

Fidelity Extended Market Index Fund

Return for Risk

FKMCX vs. FSMAX — Risk / Return Rank

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

FKMCX

FKMCX Risk / Return Rank: 60
FKMCX Sharpe Ratio Rank: 59
FKMCX Sortino Ratio Rank: 61
FKMCX Omega Ratio Rank: 56
FKMCX Calmar Ratio Rank: 58
FKMCX Martin Ratio Rank: 65

FSMAX

FSMAX Risk / Return Rank: 35
FSMAX Sharpe Ratio Rank: 33
FSMAX Sortino Ratio Rank: 36
FSMAX Omega Ratio Rank: 33
FSMAX Calmar Ratio Rank: 36
FSMAX Martin Ratio Rank: 38

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.

FKMCX vs. FSMAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Mid-Cap Stock Fund Class K (FKMCX) and Fidelity Extended Market Index Fund (FSMAX). 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.

	FKMCX	FSMAX	Difference
Sharpe ratio Return per unit of total volatility	1.06	0.72	+0.33
Sortino ratio Return per unit of downside risk	1.56	1.16	+0.40
Omega ratio Gain probability vs. loss probability	1.22	1.16	+0.06
Calmar ratio Return relative to maximum drawdown	1.36	0.95	+0.41
Martin ratio Return relative to average drawdown	6.14	3.91	+2.24
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FKMCX vs. FSMAX - Sharpe Ratio Comparison

The current FKMCX Sharpe Ratio is 1.06, which is higher than the FSMAX Sharpe Ratio of 0.72. The chart below compares the historical Sharpe Ratios of FKMCX and FSMAX, 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

	FKMCX	FSMAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.06	0.72	+0.33
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.50	0.16	+0.33
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.61	0.35	+0.26
Sharpe Ratio (All Time) Calculated using the full available price history	0.44	0.41	+0.03

Correlation

The correlation between FKMCX and FSMAX is 0.92, 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

FKMCX vs. FSMAX - Dividend Comparison

FKMCX's dividend yield for the trailing twelve months is around 1.83%, more than FSMAX's 0.60% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FKMCX Fidelity Mid-Cap Stock Fund Class K	1.83%	1.85%	8.91%	2.69%	5.49%	12.87%	6.82%	6.73%	13.52%	6.66%	8.36%	14.27%
FSMAX Fidelity Extended Market Index Fund	0.60%	0.57%	0.48%	1.17%	1.90%	7.49%	2.14%	4.30%	6.09%	5.44%	4.85%	6.34%

Drawdowns

FKMCX vs. FSMAX - Drawdown Comparison

The maximum FKMCX drawdown since its inception was -59.55%, which is greater than FSMAX's maximum drawdown of -50.55%. Use the drawdown chart below to compare losses from any high point for FKMCX and FSMAX.

Drawdown Indicators

	FKMCX	FSMAX	Difference
Max Drawdown Largest peak-to-trough decline	-59.55%	-50.55%	-9.00%
Max Drawdown (1Y) Largest decline over 1 year	-13.27%	-14.64%	+1.37%
Max Drawdown (5Y) Largest decline over 5 years	-22.31%	-36.31%	+14.00%
Max Drawdown (10Y) Largest decline over 10 years	-40.56%	-50.55%	+9.99%
Current Drawdown Current decline from peak	-8.55%	-10.26%	+1.71%
Average Drawdown Average peak-to-trough decline	-7.61%	-12.29%	+4.68%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.93%	3.54%	-0.61%

Volatility

FKMCX vs. FSMAX - Volatility Comparison

Fidelity Mid-Cap Stock Fund Class K (FKMCX) has a higher volatility of 6.50% compared to Fidelity Extended Market Index Fund (FSMAX) at 6.01%. This indicates that FKMCX's price experiences larger fluctuations and is considered to be riskier than FSMAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FKMCX	FSMAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.50%	6.01%	+0.49%
Volatility (6M) Calculated over the trailing 6-month period	11.94%	13.07%	-1.13%
Volatility (1Y) Calculated over the trailing 1-year period	19.92%	22.79%	-2.87%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.58%	22.32%	-4.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.52%	30.19%	-11.67%