IMIDX vs. FMDGX

Last updated Jun 5, 2026

IMIDX (Congress Mid Cap Growth Fund) and FMDGX (Fidelity Mid Cap Growth Index Fund) are both Mid Cap Growth Equities funds. Over the past 5 years, IMIDX returned 5.24%/yr vs 6.73%/yr for FMDGX. Their correlation of 0.93 suggests significant overlap in exposure. IMIDX charges 0.79%/yr vs 0.05%/yr for FMDGX.

Performance

IMIDX vs. FMDGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Congress Mid Cap Growth Fund (IMIDX) 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, IMIDX achieves a 16.43% return, which is significantly higher than FMDGX's 3.79% return.

IMIDX

• 1D: 0.86%
• 1M: 0.50%
• YTD: 16.43%
• 6M: 13.29%
• 1Y: 15.31%
• 3Y*: 12.67%
• 5Y*: 5.24%
• 10Y*: 12.02%

FMDGX

• 1D: -1.03%
• 1M: 3.26%
• YTD: 3.79%
• 6M: 2.25%
• 1Y: 5.68%
• 3Y*: 16.02%
• 5Y*: 6.73%
• 10Y*: —

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

IMIDX vs. FMDGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
IMIDX Congress Mid Cap Growth Fund	16.43%	-4.88%	18.11%	16.29%	-26.94%	29.42%	30.57%	15.00%
FMDGX Fidelity Mid Cap Growth Index Fund	3.79%	8.60%	22.03%	25.79%	-26.67%	12.67%	34.84%	4.63%

Correlation

The correlation between IMIDX and FMDGX is 0.85, 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	0.85
Correlation (3Y) Calculated over the trailing 3-year period	0.89
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (All Time) Calculated using the full available price history since Jul 18, 2019	0.93

The correlation between IMIDX and FMDGX has been stable across timeframes, ranging from 0.85 to 0.93 - a consistent structural relationship.

Return for Risk

IMIDX vs. FMDGX — Risk / Return Rank

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

IMIDX

IMIDX Risk / Return Rank: 12
IMIDX Sharpe Ratio Rank: 11
IMIDX Sortino Ratio Rank: 12
IMIDX Omega Ratio Rank: 11
IMIDX Calmar Ratio Rank: 15
IMIDX Martin Ratio Rank: 13

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.

IMIDX vs. FMDGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Congress Mid Cap Growth Fund (IMIDX) 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.

	IMIDX	FMDGX	Difference
Sharpe ratio: Return per unit of total volatility	0.88	0.35	+0.53
Sortino ratio: Return per unit of downside risk	1.36	0.61	+0.75
Omega ratio: Gain probability vs. loss probability	1.16	1.07	+0.09
Calmar ratio: Return relative to maximum drawdown	1.32	0.39	+0.94
Martin ratio: Return relative to average drawdown	3.51	1.13	+2.38
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IMIDX vs. FMDGX - Sharpe Ratio Comparison

The current IMIDX Sharpe Ratio is 0.88, which is higher than the FMDGX Sharpe Ratio of 0.35. The chart below compares the historical Sharpe Ratios of IMIDX 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.

Sharpe Ratios by Period

	IMIDX	FMDGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.88	0.35	+0.53
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.25	0.30	-0.06
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.57	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.66	0.44	+0.22

Drawdowns

IMIDX vs. FMDGX - Drawdown Comparison

The maximum IMIDX drawdown since its inception was -35.15%, smaller than the maximum FMDGX drawdown of -38.59%. Use the drawdown chart below to compare losses from any high point for IMIDX and FMDGX.

Drawdown Indicators

	IMIDX	FMDGX	Difference
Max Drawdown Largest peak-to-trough decline	-35.15%	-38.59%	+3.44%
Max Drawdown (1Y) Largest decline over 1 year	-12.10%	-14.75%	+2.65%
Max Drawdown (3Y) Largest decline over 3 years	-23.49%	-25.30%	+1.81%
Max Drawdown (5Y) Largest decline over 5 years	-34.88%	-38.59%	+3.71%
Max Drawdown (10Y) Largest decline over 10 years	-35.15%	—	—
Current Drawdown Current decline from peak	-1.55%	-2.11%	+0.56%
Average Drawdown Average peak-to-trough decline	-7.20%	-11.20%	+4.00%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.55%	5.05%	-0.50%

Volatility

IMIDX vs. FMDGX - Volatility Comparison

Congress Mid Cap Growth Fund (IMIDX) has a higher volatility of 6.07% compared to Fidelity Mid Cap Growth Index Fund (FMDGX) at 3.75%. This indicates that IMIDX'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

	IMIDX	FMDGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.07%	3.75%	+2.32%
Volatility (6M) Calculated over the trailing 6-month period	14.93%	12.66%	+2.27%
Volatility (1Y) Calculated over the trailing 1-year period	18.29%	16.49%	+1.80%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.39%	22.37%	-0.98%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.11%	24.32%	-3.21%

IMIDX vs. FMDGX - Expense Ratio Comparison

IMIDX has a 0.79% expense ratio, which is higher than FMDGX's 0.05% expense ratio.

Dividends

IMIDX vs. FMDGX - Dividend Comparison

IMIDX's dividend yield for the trailing twelve months is around 11.40%, more than FMDGX's 1.79% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FMDGX Fidelity Mid Cap Growth Index Fund	1.79%	1.85%	0.47%	0.63%	0.81%	6.43%	0.36%	0.29%	0.00%	0.00%	0.00%	0.00%
IMIDX Congress Mid Cap Growth Fund	11.40%	13.27%	27.75%	6.27%	5.80%	12.29%	2.06%	10.80%	2.99%	0.04%	1.11%	0.80%

Frequently Asked Questions

Can I hold both IMIDX and FMDGX in my portfolio?

IMIDX and FMDGX have a correlation of 0.85, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IMIDX or FMDGX?

IMIDX has higher volatility (6.07%) compared to FMDGX (3.75%). In terms of maximum drawdown, IMIDX dropped -35.15% vs FMDGX's -38.59%.

Which has better risk-adjusted returns?

IMIDX currently has the higher Sharpe Ratio (0.88 vs 0.35), 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.