ATGAX vs. VEMPX

Last updated Jun 3, 2026

ATGAX (Aquila Opportunity Growth Fund) and VEMPX (Vanguard Extended Market Index Fund Institutional Plus Shares) are both Mid Cap Blend Equities funds. With a 1.00 correlation, they move nearly in lockstep. ATGAX charges 1.50%/yr vs 0.04%/yr for VEMPX.

Performance

ATGAX vs. VEMPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Aquila Opportunity Growth Fund (ATGAX) and Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

ATGAX

• 1D: 0.85%
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

VEMPX

• 1D: 0.27%
• 1M: 4.32%
• YTD: 13.72%
• 6M: 14.02%
• 1Y: 30.59%
• 3Y*: 19.74%
• 5Y*: 6.49%
• 10Y*: 12.09%

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

ATGAX vs. VEMPX - Yearly Performance Comparison

	2026 (YTD)
ATGAX Aquila Opportunity Growth Fund	0.87%
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	0.38%

Correlation

The correlation between ATGAX and VEMPX 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

ATGAX vs. VEMPX — Risk / Return Rank

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

VEMPX

VEMPX Risk / Return Rank: 44
VEMPX Sharpe Ratio Rank: 38
VEMPX Sortino Ratio Rank: 36
VEMPX Omega Ratio Rank: 33
VEMPX Calmar Ratio Rank: 60
VEMPX Martin Ratio Rank: 51

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.

ATGAX vs. VEMPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Aquila Opportunity Growth Fund (ATGAX) and Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX). 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	ATGAX	VEMPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	1.80	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.29	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.54	—
Sharpe Ratio (All Time) Calculated using the full available price history	30.24	0.54	+29.69

Drawdowns

ATGAX vs. VEMPX - Drawdown Comparison

The maximum ATGAX drawdown since its inception was 0.00%, smaller than the maximum VEMPX drawdown of -41.62%. Use the drawdown chart below to compare losses from any high point for ATGAX and VEMPX.

Drawdown Indicators

	ATGAX	VEMPX	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	-41.62%	+41.62%
Max Drawdown (1Y) Largest decline over 1 year	—	-10.25%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-26.83%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-36.32%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-41.62%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	0.00%	-7.97%	+7.97%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	2.89%	—

Volatility

Volatility by Period

	ATGAX	VEMPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	4.62%	—
Volatility (6M) Calculated over the trailing 6-month period	—	12.44%	—
Volatility (1Y) Calculated over the trailing 1-year period	9.31%	17.18%	-7.87%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	9.31%	22.34%	-13.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	9.31%	22.36%	-13.05%

ATGAX vs. VEMPX - Expense Ratio Comparison

ATGAX has a 1.50% expense ratio, which is higher than VEMPX's 0.04% expense ratio.

Dividends

ATGAX vs. VEMPX - Dividend Comparison

ATGAX has not paid dividends to shareholders, while VEMPX's dividend yield for the trailing twelve months is around 1.03%.

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%
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	1.03%	1.15%	1.11%	1.27%	1.17%	1.15%	1.09%	1.32%	1.68%	1.27%	1.46%	1.39%

Frequently Asked Questions

Can I hold both ATGAX and VEMPX in my portfolio?

With a correlation of 1.00, ATGAX and VEMPX 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.