FKMCX vs. VMCIX

Last updated Jun 4, 2026

FKMCX (Fidelity Mid-Cap Stock Fund Class K) and VMCIX (Vanguard Mid-Cap Index Fund Institutional Shares) are both Mid Cap Blend Equities funds. Over the past 10 years, FKMCX returned 12.42%/yr vs 11.59%/yr for VMCIX. Their correlation of 0.95 suggests significant overlap in exposure. FKMCX charges 0.76%/yr vs 0.04%/yr for VMCIX.

Performance

FKMCX vs. VMCIX - Performance Comparison

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

Returns By Period

In the year-to-date period, FKMCX achieves a 17.41% return, which is significantly higher than VMCIX's 10.56% return. Over the past 10 years, FKMCX has outperformed VMCIX with an annualized return of 12.42%, while VMCIX has yielded a comparatively lower 11.59% annualized return.

FKMCX

• 1D: 1.64%
• 1M: 3.82%
• YTD: 17.41%
• 6M: 18.76%
• 1Y: 31.44%
• 3Y*: 18.63%
• 5Y*: 10.45%
• 10Y*: 12.42%

VMCIX

• 1D: 0.90%
• 1M: 3.69%
• YTD: 10.56%
• 6M: 10.21%
• 1Y: 18.75%
• 3Y*: 16.83%
• 5Y*: 8.11%
• 10Y*: 11.59%

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

FKMCX vs. VMCIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FKMCX Fidelity Mid-Cap Stock Fund Class K	17.41%	11.87%	14.65%	11.11%	-6.30%	28.72%	11.56%	25.50%	-10.21%	18.03%
VMCIX Vanguard Mid-Cap Index Fund Institutional Shares	10.56%	11.67%	14.68%	16.54%	-18.70%	24.53%	18.20%	31.04%	-9.25%	19.30%

Correlation

The correlation between FKMCX and VMCIX is 0.89, 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	0.89
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since May 12, 2008	0.95

The correlation between FKMCX and VMCIX has been stable across timeframes, ranging from 0.89 to 0.95 - a consistent structural relationship.

Return for Risk

FKMCX vs. VMCIX — Risk / Return Rank

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

FKMCX

FKMCX Risk / Return Rank: 62
FKMCX Sharpe Ratio Rank: 51
FKMCX Sortino Ratio Rank: 49
FKMCX Omega Ratio Rank: 46
FKMCX Calmar Ratio Rank: 83
FKMCX Martin Ratio Rank: 80

VMCIX

VMCIX Risk / Return Rank: 35
VMCIX Sharpe Ratio Rank: 32
VMCIX Sortino Ratio Rank: 31
VMCIX Omega Ratio Rank: 29
VMCIX Calmar Ratio Rank: 42
VMCIX Martin Ratio Rank: 44

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. VMCIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Mid-Cap Stock Fund Class K (FKMCX) and Vanguard Mid-Cap Index Fund Institutional Shares (VMCIX). 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	VMCIX	Difference
Sharpe ratio Return per unit of total volatility	2.12	1.62	+0.50
Sortino ratio Return per unit of downside risk	2.97	2.31	+0.66
Omega ratio Gain probability vs. loss probability	1.37	1.28	+0.09
Calmar ratio Return relative to maximum drawdown	3.86	2.45	+1.42
Martin ratio Return relative to average drawdown	14.97	9.29	+5.68
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. VMCIX - Sharpe Ratio Comparison

The current FKMCX Sharpe Ratio is 2.12, which is higher than the VMCIX Sharpe Ratio of 1.62. The chart below compares the historical Sharpe Ratios of FKMCX and VMCIX, 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

	FKMCX	VMCIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.12	1.62	+0.50
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.59	0.46	+0.13
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.67	0.61	+0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.48	0.49	-0.01

Drawdowns

FKMCX vs. VMCIX - Drawdown Comparison

The maximum FKMCX drawdown since its inception was -59.55%, roughly equal to the maximum VMCIX drawdown of -58.86%. Use the drawdown chart below to compare losses from any high point for FKMCX and VMCIX.

Drawdown Indicators

	FKMCX	VMCIX	Difference
Max Drawdown Largest peak-to-trough decline	-59.55%	-58.86%	-0.69%
Max Drawdown (1Y) Largest decline over 1 year	-8.55%	-8.13%	-0.42%
Max Drawdown (3Y) Largest decline over 3 years	-22.31%	-18.93%	-3.38%
Max Drawdown (5Y) Largest decline over 5 years	-22.31%	-27.54%	+5.23%
Max Drawdown (10Y) Largest decline over 10 years	-40.56%	-39.30%	-1.26%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-7.55%	-7.97%	+0.42%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.20%	2.14%	+0.06%

Volatility

FKMCX vs. VMCIX - Volatility Comparison

Fidelity Mid-Cap Stock Fund Class K (FKMCX) has a higher volatility of 5.06% compared to Vanguard Mid-Cap Index Fund Institutional Shares (VMCIX) at 2.97%. This indicates that FKMCX's price experiences larger fluctuations and is considered to be riskier than VMCIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FKMCX	VMCIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.06%	2.97%	+2.09%
Volatility (6M) Calculated over the trailing 6-month period	12.29%	9.29%	+3.00%
Volatility (1Y) Calculated over the trailing 1-year period	15.62%	12.31%	+3.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.71%	17.63%	+0.08%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.62%	18.92%	-0.30%

FKMCX vs. VMCIX - Expense Ratio Comparison

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

Dividends

FKMCX vs. VMCIX - Dividend Comparison

FKMCX's dividend yield for the trailing twelve months is around 1.58%, more than VMCIX's 1.35% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FKMCX Fidelity Mid-Cap Stock Fund Class K	1.58%	1.85%	8.91%	2.69%	5.49%	12.87%	6.82%	6.73%	13.52%	6.66%	8.36%	14.27%
VMCIX Vanguard Mid-Cap Index Fund Institutional Shares	1.35%	1.52%	1.49%	1.51%	1.60%	1.12%	1.45%	1.48%	1.83%	1.36%	1.46%	1.48%

Frequently Asked Questions

Can I hold both FKMCX and VMCIX in my portfolio?

FKMCX and VMCIX have a correlation of 0.89, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FKMCX or VMCIX?

FKMCX has higher volatility (5.06%) compared to VMCIX (2.97%). In terms of maximum drawdown, FKMCX dropped -59.55% vs VMCIX's -58.86%.

Which has better risk-adjusted returns?

FKMCX currently has the higher Sharpe Ratio (2.12 vs 1.62), 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.