VMGIX vs. OEGYX

Last updated Jun 5, 2026

VMGIX (Vanguard Mid-Cap Growth Index Fund) and OEGYX (Invesco Discovery Mid Cap Growth Fund) are both Mid Cap Growth Equities funds. Over the past 10 years, VMGIX returned 12.04%/yr vs 13.79%/yr for OEGYX. Their correlation of 0.95 suggests significant overlap in exposure. VMGIX charges 0.19%/yr vs 0.78%/yr for OEGYX.

Performance

VMGIX vs. OEGYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Mid-Cap Growth Index Fund (VMGIX) and Invesco Discovery Mid Cap Growth Fund (OEGYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VMGIX achieves a 8.31% return, which is significantly lower than OEGYX's 26.11% return. Over the past 10 years, VMGIX has underperformed OEGYX with an annualized return of 12.04%, while OEGYX has yielded a comparatively higher 13.79% annualized return.

VMGIX

• 1D: -0.84%
• 1M: 4.40%
• YTD: 8.31%
• 6M: 6.09%
• 1Y: 11.34%
• 3Y*: 16.10%
• 5Y*: 6.76%
• 10Y*: 12.04%

OEGYX

• 1D: 0.00%
• 1M: 4.28%
• YTD: 26.11%
• 6M: 22.33%
• 1Y: 33.28%
• 3Y*: 21.12%
• 5Y*: 8.08%
• 10Y*: 13.79%

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

VMGIX vs. OEGYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VMGIX Vanguard Mid-Cap Growth Index Fund	8.31%	10.56%	15.51%	23.79%	-28.93%	20.32%	34.30%	33.69%	-5.73%	21.72%
OEGYX Invesco Discovery Mid Cap Growth Fund	26.11%	5.08%	24.38%	13.24%	-30.92%	18.76%	40.53%	39.33%	-6.50%	28.34%

Correlation

The correlation between VMGIX and OEGYX is 0.86, 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	0.86
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.94
Correlation (All Time) Calculated using the full available price history since Aug 25, 2006	0.95

The correlation between VMGIX and OEGYX has been stable across timeframes, ranging from 0.86 to 0.95 - a consistent structural relationship.

Return for Risk

VMGIX vs. OEGYX — Risk / Return Rank

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

VMGIX

VMGIX Risk / Return Rank: 8
VMGIX Sharpe Ratio Rank: 9
VMGIX Sortino Ratio Rank: 9
VMGIX Omega Ratio Rank: 8
VMGIX Calmar Ratio Rank: 8
VMGIX Martin Ratio Rank: 8

OEGYX

OEGYX Risk / Return Rank: 47
OEGYX Sharpe Ratio Rank: 35
OEGYX Sortino Ratio Rank: 31
OEGYX Omega Ratio Rank: 31
OEGYX Calmar Ratio Rank: 76
OEGYX Martin Ratio Rank: 63

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.

VMGIX vs. OEGYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Mid-Cap Growth Index Fund (VMGIX) and Invesco Discovery Mid Cap Growth Fund (OEGYX). 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.

	VMGIX	OEGYX	Difference
Sharpe ratio: Return per unit of total volatility	0.72	1.68	-0.97
Sortino ratio: Return per unit of downside risk	1.10	2.31	-1.21
Omega ratio: Gain probability vs. loss probability	1.13	1.29	-0.16
Calmar ratio: Return relative to maximum drawdown	0.71	3.37	-2.66
Martin ratio: Return relative to average drawdown	2.13	12.22	-10.09
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VMGIX vs. OEGYX - Sharpe Ratio Comparison

The current VMGIX Sharpe Ratio is 0.72, which is lower than the OEGYX Sharpe Ratio of 1.68. The chart below compares the historical Sharpe Ratios of VMGIX and OEGYX, 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

	VMGIX	OEGYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.72	1.68	-0.97
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.32	0.37	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.58	0.63	-0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.44	0.39	+0.05

Drawdowns

VMGIX vs. OEGYX - Drawdown Comparison

The maximum VMGIX drawdown since its inception was -60.20%, which is greater than OEGYX's maximum drawdown of -53.44%. Use the drawdown chart below to compare losses from any high point for VMGIX and OEGYX.

Drawdown Indicators

	VMGIX	OEGYX	Difference
Max Drawdown Largest peak-to-trough decline	-60.20%	-53.44%	-6.76%
Max Drawdown (1Y) Largest decline over 1 year	-15.99%	-10.14%	-5.85%
Max Drawdown (3Y) Largest decline over 3 years	-21.67%	-28.58%	+6.91%
Max Drawdown (5Y) Largest decline over 5 years	-37.25%	-39.25%	+2.00%
Max Drawdown (10Y) Largest decline over 10 years	-37.25%	-39.25%	+2.00%
Current Drawdown Current decline from peak	-0.84%	0.00%	-0.84%
Average Drawdown Average peak-to-trough decline	-10.01%	-12.50%	+2.49%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.33%	2.79%	+2.54%

Volatility

VMGIX vs. OEGYX - Volatility Comparison

The current volatility for Vanguard Mid-Cap Growth Index Fund (VMGIX) is 4.41%, while Invesco Discovery Mid Cap Growth Fund (OEGYX) has a volatility of 6.46%. This indicates that VMGIX experiences smaller price fluctuations and is considered to be less risky than OEGYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMGIX	OEGYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.41%	6.46%	-2.05%
Volatility (6M) Calculated over the trailing 6-month period	12.46%	16.62%	-4.16%
Volatility (1Y) Calculated over the trailing 1-year period	15.92%	20.31%	-4.39%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.42%	22.09%	-0.67%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.99%	22.04%	-1.05%

VMGIX vs. OEGYX - Expense Ratio Comparison

VMGIX has a 0.19% expense ratio, which is lower than OEGYX's 0.78% expense ratio.

Dividends

VMGIX vs. OEGYX - Dividend Comparison

VMGIX's dividend yield for the trailing twelve months is around 0.49%, less than OEGYX's 5.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OEGYX Invesco Discovery Mid Cap Growth Fund	5.91%	7.45%	4.13%	0.00%	0.00%	16.02%	3.08%	3.85%	9.31%	8.34%	0.81%	3.88%
VMGIX Vanguard Mid-Cap Growth Index Fund	0.49%	0.52%	0.56%	0.60%	0.64%	0.23%	0.46%	0.67%	0.70%	0.61%	0.70%	0.69%

Frequently Asked Questions

Can I hold both VMGIX and OEGYX in my portfolio?

VMGIX and OEGYX have a correlation of 0.86, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VMGIX or OEGYX?

OEGYX has higher volatility (6.46%) compared to VMGIX (4.41%). In terms of maximum drawdown, VMGIX dropped -60.20% vs OEGYX's -53.44%.

Which has better risk-adjusted returns?

OEGYX currently has the higher Sharpe Ratio (1.68 vs 0.72), 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.