FMCSX vs. FSMAX

Last updated Jun 23, 2026

FMCSX (Fidelity Mid-Cap Stock Fund) and FSMAX (Fidelity Extended Market Index Fund) are both Mid Cap Blend Equities funds from Fidelity. Over the past 10 years, FMCSX returned 13.10%/yr vs 12.31%/yr for FSMAX. Their correlation of 0.92 suggests significant overlap in exposure. FMCSX charges 0.85%/yr vs 0.04%/yr for FSMAX.

Performance

FMCSX vs. FSMAX - Performance Comparison

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

Returns By Period

In the year-to-date period, FMCSX achieves a 19.85% return, which is significantly higher than FSMAX's 15.56% return. Over the past 10 years, FMCSX has outperformed FSMAX with an annualized return of 13.10%, while FSMAX has yielded a comparatively lower 12.31% annualized return.

FMCSX

• 1D: 0.72%
• 1M: 4.53%
• YTD: 19.85%
• 6M: 17.25%
• 1Y: 34.40%
• 3Y*: 18.42%
• 5Y*: 11.91%
• 10Y*: 13.10%

FSMAX

• 1D: 1.67%
• 1M: 4.32%
• YTD: 15.56%
• 6M: 12.55%
• 1Y: 30.47%
• 3Y*: 19.09%
• 5Y*: 6.93%
• 10Y*: 12.31%

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

FMCSX vs. FSMAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FMCSX Fidelity Mid-Cap Stock Fund	19.85%	11.80%	14.55%	11.02%	-6.40%	28.64%	11.43%	25.39%	-6.67%	18.03%
FSMAX Fidelity Extended Market Index Fund	15.56%	11.40%	16.99%	25.36%	-26.44%	12.41%	32.28%	28.01%	-9.44%	18.04%

Correlation

The correlation between FMCSX and FSMAX is 0.91, 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	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.91
Correlation (All Time) Calculated using the full available price history since Sep 8, 2011	0.92

The correlation between FMCSX and FSMAX has been stable across timeframes, ranging from 0.91 to 0.93 - a consistent structural relationship.

Return for Risk

FMCSX vs. FSMAX — Risk / Return Rank

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

FMCSX

FMCSX Risk / Return Rank: 71
FMCSX Sharpe Ratio Rank: 63
FMCSX Sortino Ratio Rank: 60
FMCSX Omega Ratio Rank: 55
FMCSX Calmar Ratio Rank: 88
FMCSX Martin Ratio Rank: 88

FSMAX

FSMAX Risk / Return Rank: 46
FSMAX Sharpe Ratio Rank: 40
FSMAX Sortino Ratio Rank: 38
FSMAX Omega Ratio Rank: 35
FSMAX Calmar Ratio Rank: 65
FSMAX Martin Ratio Rank: 55

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.

FMCSX vs. FSMAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Mid-Cap Stock Fund (FMCSX) 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.

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.

	FMCSX	FSMAX	Difference
Sharpe ratio: Return per unit of total volatility	2.14	1.71	+0.43
Sortino ratio: Return per unit of downside risk	2.97	2.38	+0.58
Omega ratio: Gain probability vs. loss probability	1.37	1.29	+0.08
Calmar ratio: Return relative to maximum drawdown	4.05	2.96	+1.09
Martin ratio: Return relative to average drawdown	15.54	10.38	+5.16

FMCSX vs. FSMAX - Sharpe Ratio Comparison

The current FMCSX Sharpe Ratio is 2.14, which is comparable to the FSMAX Sharpe Ratio of 1.71. The chart below compares the historical Sharpe Ratios of FMCSX and FSMAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

FMCSX vs. FSMAX - Drawdown Comparison

The maximum FMCSX drawdown since its inception was -62.19%, which is greater than FSMAX's maximum drawdown of -50.55%. Use the drawdown chart below to compare losses from any high point for FMCSX and FSMAX.

Drawdown Indicators

	FMCSX	FSMAX	Difference
Max Drawdown Largest peak-to-trough decline	-62.19%	-50.55%	-11.64%
Max Drawdown (1Y) Largest decline over 1 year	-8.55%	-10.26%	+1.71%
Max Drawdown (3Y) Largest decline over 3 years	-22.33%	-26.82%	+4.49%
Max Drawdown (5Y) Largest decline over 5 years	-22.33%	-36.31%	+13.98%
Max Drawdown (10Y) Largest decline over 10 years	-40.55%	-50.55%	+10.00%
Current Drawdown Current decline from peak	-0.69%	-0.11%	-0.58%
Average Drawdown Average peak-to-trough decline	-9.34%	-12.13%	+2.79%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.22%	2.92%	-0.70%

Volatility

FMCSX vs. FSMAX - Volatility Comparison

The current volatility for Fidelity Mid-Cap Stock Fund (FMCSX) is 5.68%, while Fidelity Extended Market Index Fund (FSMAX) has a volatility of 6.36%. This indicates that FMCSX experiences smaller price fluctuations and is considered to be less risky than FSMAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FMCSX	FSMAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.68%	6.36%	-0.68%
Volatility (6M) Calculated over the trailing 6-month period	12.88%	13.32%	-0.44%
Volatility (1Y) Calculated over the trailing 1-year period	16.19%	17.80%	-1.61%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.80%	22.44%	-4.64%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.63%	30.27%	-11.64%

FMCSX vs. FSMAX - Expense Ratio Comparison

FMCSX has a 0.85% expense ratio, which is higher than FSMAX's 0.04% expense ratio.

Dividends

FMCSX vs. FSMAX - Dividend Comparison

FMCSX's dividend yield for the trailing twelve months is around 5.17%, more than FSMAX's 0.50% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FMCSX Fidelity Mid-Cap Stock Fund	5.17%	1.83%	8.94%	2.60%	5.44%	12.80%	6.72%	6.63%	18.48%	6.66%	8.25%	14.18%
FSMAX Fidelity Extended Market Index Fund	0.50%	0.57%	0.48%	1.17%	1.90%	7.49%	2.14%	4.30%	6.09%	5.44%	4.85%	6.34%

Frequently Asked Questions

Can I hold both FMCSX and FSMAX in my portfolio?

With a correlation of 0.91, FMCSX and FSMAX 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, FMCSX or FSMAX?

FSMAX has higher volatility (6.36%) compared to FMCSX (5.68%). In terms of maximum drawdown, FMCSX dropped -62.19% vs FSMAX's -50.55%.

Which has better risk-adjusted returns?

FMCSX currently has the higher Sharpe Ratio (2.14 vs 1.71), 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.