FECGX vs. FMDGX

Last updated Jun 19, 2026

FECGX (Fidelity Small Cap Growth Index Fund) and FMDGX (Fidelity Mid Cap Growth Index Fund) are both mutual funds - FECGX is a Small Cap Growth Equities fund managed by Fidelity, while FMDGX is a Mid Cap Growth Equities fund tracking the Russell Midcap Growth Index. Over the past 5 years, FECGX returned 5.79%/yr vs 5.89%/yr for FMDGX. Their correlation of 0.90 suggests significant overlap in exposure. Both charge a 0.05% expense ratio.

Performance

FECGX vs. FMDGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Small Cap Growth Index Fund (FECGX) and Fidelity Mid Cap Growth Index Fund (FMDGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FECGX achieves a 17.75% return, which is significantly higher than FMDGX's 2.85% return.

FECGX

• 1D: -0.38%
• 1M: 7.60%
• YTD: 17.75%
• 6M: 17.35%
• 1Y: 38.09%
• 3Y*: 17.52%
• 5Y*: 5.79%
• 10Y*: —

FMDGX

• 1D: -1.07%
• 1M: 4.25%
• YTD: 2.85%
• 6M: 2.65%
• 1Y: 4.81%
• 3Y*: 14.47%
• 5Y*: 5.89%
• 10Y*: —

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

FECGX vs. FMDGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
FECGX Fidelity Small Cap Growth Index Fund	17.75%	13.04%	15.26%	18.90%	-26.17%	2.83%	34.41%	7.11%
FMDGX Fidelity Mid Cap Growth Index Fund	2.85%	8.60%	22.03%	25.79%	-26.67%	12.67%	34.84%	4.63%

Correlation

The correlation between FECGX and FMDGX is 0.87, 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	0.87
Correlation (3Y) Calculated over the trailing 3-year period	0.88
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (All Time) Calculated using the full available price history since Jul 17, 2019	0.90

The correlation between FECGX and FMDGX has been stable across timeframes, ranging from 0.87 to 0.91 - a consistent structural relationship.

Return for Risk

FECGX vs. FMDGX — Risk / Return Rank

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

FECGX

FECGX Risk / Return Rank: 44
FECGX Sharpe Ratio Rank: 43
FECGX Sortino Ratio Rank: 39
FECGX Omega Ratio Rank: 36
FECGX Calmar Ratio Rank: 53
FECGX Martin Ratio Rank: 49

FMDGX

FMDGX Risk / Return Rank: 5
FMDGX Sharpe Ratio Rank: 5
FMDGX Sortino Ratio Rank: 5
FMDGX Omega Ratio Rank: 5
FMDGX Calmar Ratio Rank: 5
FMDGX Martin Ratio Rank: 5

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.

FECGX vs. FMDGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Small Cap Growth Index Fund (FECGX) and Fidelity Mid Cap Growth Index Fund (FMDGX). 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.

	FECGX	FMDGX	Difference
Sharpe ratio: Return per unit of total volatility	1.77	0.31	+1.45
Sortino ratio: Return per unit of downside risk	2.42	0.56	+1.86
Omega ratio: Gain probability vs. loss probability	1.29	1.06	+0.23
Calmar ratio: Return relative to maximum drawdown	2.63	0.36	+2.27
Martin ratio: Return relative to average drawdown	9.41	1.04	+8.37

FECGX vs. FMDGX - Sharpe Ratio Comparison

The current FECGX Sharpe Ratio is 1.77, which is higher than the FMDGX Sharpe Ratio of 0.31. The chart below compares the historical Sharpe Ratios of FECGX and FMDGX, 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

FECGX vs. FMDGX - Drawdown Comparison

The maximum FECGX drawdown since its inception was -41.85%, which is greater than FMDGX's maximum drawdown of -38.59%. Use the drawdown chart below to compare losses from any high point for FECGX and FMDGX.

Drawdown Indicators

	FECGX	FMDGX	Difference
Max Drawdown Largest peak-to-trough decline	-41.85%	-38.59%	-3.26%
Max Drawdown (1Y) Largest decline over 1 year	-14.81%	-14.75%	-0.06%
Max Drawdown (3Y) Largest decline over 3 years	-28.45%	-25.30%	-3.15%
Max Drawdown (5Y) Largest decline over 5 years	-40.34%	-38.59%	-1.75%
Current Drawdown Current decline from peak	-1.56%	-3.00%	+1.44%
Average Drawdown Average peak-to-trough decline	-15.67%	-11.15%	-4.52%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.13%	5.09%	-0.96%

Volatility

FECGX vs. FMDGX - Volatility Comparison

Fidelity Small Cap Growth Index Fund (FECGX) has a higher volatility of 7.83% compared to Fidelity Mid Cap Growth Index Fund (FMDGX) at 5.93%. This indicates that FECGX's price experiences larger fluctuations and is considered to be riskier than FMDGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FECGX	FMDGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.83%	5.93%	+1.90%
Volatility (6M) Calculated over the trailing 6-month period	16.67%	13.39%	+3.28%
Volatility (1Y) Calculated over the trailing 1-year period	22.07%	17.04%	+5.03%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.68%	22.45%	+2.23%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	27.21%	24.31%	+2.90%

FECGX vs. FMDGX - Expense Ratio Comparison

Both FECGX and FMDGX have an expense ratio of 0.05%, making them cost-effective options compared to the broader market, where average expense ratios typically range from 0.3% to 0.9%.

Dividends

FECGX vs. FMDGX - Dividend Comparison

FECGX's dividend yield for the trailing twelve months is around 0.46%, less than FMDGX's 1.80% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
FECGX Fidelity Small Cap Growth Index Fund	0.46%	0.54%	1.25%	0.81%	0.80%	3.43%	1.00%	0.29%
FMDGX Fidelity Mid Cap Growth Index Fund	1.80%	1.85%	0.47%	0.63%	0.81%	6.43%	0.36%	0.29%

Frequently Asked Questions

Can I hold both FECGX and FMDGX in my portfolio?

FECGX and FMDGX have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FECGX or FMDGX?

FECGX has higher volatility (7.83%) compared to FMDGX (5.93%). In terms of maximum drawdown, FECGX dropped -41.85% vs FMDGX's -38.59%.

Which has better risk-adjusted returns?

FECGX currently has the higher Sharpe Ratio (1.76 vs 0.31), 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.