VIMAX vs. ATGAX

Last updated Jun 4, 2026

VIMAX (Vanguard Mid-Cap Index Fund Admiral Shares) and ATGAX (Aquila Opportunity Growth Fund) are both Mid Cap Blend Equities funds. With a 1.00 correlation, they move nearly in lockstep. VIMAX charges 0.05%/yr vs 1.50%/yr for ATGAX.

Performance

VIMAX vs. ATGAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Mid-Cap Index Fund Admiral Shares (VIMAX) and Aquila Opportunity Growth Fund (ATGAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

VIMAX

• 1D: 0.90%
• 1M: 3.68%
• YTD: 10.54%
• 6M: 10.20%
• 1Y: 18.73%
• 3Y*: 16.82%
• 5Y*: 8.10%
• 10Y*: 11.58%

ATGAX

• 1D: 1.15%
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

VIMAX vs. ATGAX - Yearly Performance Comparison

	2026 (YTD)
VIMAX Vanguard Mid-Cap Index Fund Admiral Shares	1.40%
ATGAX Aquila Opportunity Growth Fund	2.03%

Correlation

The correlation between VIMAX and ATGAX is 1.00 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (All Time) Calculated using the full available price history since May 29, 2026	1.00

Return for Risk

VIMAX vs. ATGAX — Risk / Return Rank

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

VIMAX

VIMAX Risk / Return Rank: 35
VIMAX Sharpe Ratio Rank: 32
VIMAX Sortino Ratio Rank: 31
VIMAX Omega Ratio Rank: 29
VIMAX Calmar Ratio Rank: 41
VIMAX 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.

VIMAX vs. ATGAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Mid-Cap Index Fund Admiral Shares (VIMAX) and Aquila Opportunity Growth Fund (ATGAX). 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.

	VIMAX	ATGAX	Difference
Sharpe ratio: Return per unit of total volatility	1.61	—	—
Sortino ratio: Return per unit of downside risk	2.31	—	—
Omega ratio: Gain probability vs. loss probability	1.28	—	—
Calmar ratio: Return relative to maximum drawdown	2.44	—	—
Martin ratio: Return relative to average drawdown	9.28	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	VIMAX	ATGAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.61	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.46	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.61	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.50	58.33	-57.83

Drawdowns

VIMAX vs. ATGAX - Drawdown Comparison

The maximum VIMAX drawdown since its inception was -58.88%, which is greater than ATGAX's maximum drawdown of 0.00%. Use the drawdown chart below to compare losses from any high point for VIMAX and ATGAX.

Drawdown Indicators

	VIMAX	ATGAX	Difference
Max Drawdown Largest peak-to-trough decline	-58.88%	0.00%	-58.88%
Max Drawdown (1Y) Largest decline over 1 year	-8.13%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-18.93%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-27.55%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-39.30%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-8.12%	0.00%	-8.12%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.14%	—	—

Volatility

Volatility by Period

	VIMAX	ATGAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.97%	—	—
Volatility (6M) Calculated over the trailing 6-month period	9.28%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	12.30%	9.26%	+3.04%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.63%	9.26%	+8.37%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.92%	9.26%	+9.66%

VIMAX vs. ATGAX - Expense Ratio Comparison

VIMAX has a 0.05% expense ratio, which is lower than ATGAX's 1.50% expense ratio.

Dividends

VIMAX vs. ATGAX - Dividend Comparison

VIMAX's dividend yield for the trailing twelve months is around 1.34%, while ATGAX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ATGAX Aquila Opportunity Growth Fund	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
VIMAX Vanguard Mid-Cap Index Fund Admiral Shares	1.34%	1.51%	1.48%	1.50%	1.59%	1.11%	1.44%	1.47%	1.82%	1.35%	1.45%	1.47%

Frequently Asked Questions

Can I hold both VIMAX and ATGAX in my portfolio?

With a correlation of 1.00, VIMAX and ATGAX 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.