ATGAX vs. VSPMX

Last updated Jun 3, 2026

ATGAX (Aquila Opportunity Growth Fund) and VSPMX (Vanguard S&P Mid-Cap 400 Index Fund Institutional Shares) are both Mid Cap Blend Equities funds. At a correlation of -1.00, they often move in opposite directions. ATGAX charges 1.50%/yr vs 0.08%/yr for VSPMX.

Performance

ATGAX vs. VSPMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Aquila Opportunity Growth Fund (ATGAX) and Vanguard S&P Mid-Cap 400 Index Fund Institutional Shares (VSPMX). 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*: —

VSPMX

• 1D: -0.06%
• 1M: 2.38%
• YTD: 13.19%
• 6M: 14.26%
• 1Y: 26.04%
• 3Y*: 15.67%
• 5Y*: 7.92%
• 10Y*: 11.13%

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

ATGAX vs. VSPMX - Yearly Performance Comparison

	2026 (YTD)
ATGAX Aquila Opportunity Growth Fund	0.87%
VSPMX Vanguard S&P Mid-Cap 400 Index Fund Institutional Shares	0.12%

Correlation

The correlation between ATGAX and VSPMX is -1.00, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

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

Return for Risk

ATGAX vs. VSPMX — Risk / Return Rank

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

VSPMX

VSPMX Risk / Return Rank: 41
VSPMX Sharpe Ratio Rank: 33
VSPMX Sortino Ratio Rank: 34
VSPMX Omega Ratio Rank: 31
VSPMX Calmar Ratio Rank: 56
VSPMX 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. VSPMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Aquila Opportunity Growth Fund (ATGAX) and Vanguard S&P Mid-Cap 400 Index Fund Institutional Shares (VSPMX). 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	VSPMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	1.68	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.41	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.53	—
Sharpe Ratio (All Time) Calculated using the full available price history	30.24	0.63	+29.61

Drawdowns

ATGAX vs. VSPMX - Drawdown Comparison

The maximum ATGAX drawdown since its inception was 0.00%, smaller than the maximum VSPMX drawdown of -42.04%. Use the drawdown chart below to compare losses from any high point for ATGAX and VSPMX.

Drawdown Indicators

	ATGAX	VSPMX	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	-42.04%	+42.04%
Max Drawdown (1Y) Largest decline over 1 year	—	-8.82%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-24.27%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-24.27%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-42.04%	—
Current Drawdown Current decline from peak	0.00%	-0.11%	+0.11%
Average Drawdown Average peak-to-trough decline	0.00%	-5.09%	+5.09%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	2.41%	—

Volatility

Volatility by Period

	ATGAX	VSPMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	4.37%	—
Volatility (6M) Calculated over the trailing 6-month period	—	11.28%	—
Volatility (1Y) Calculated over the trailing 1-year period	9.31%	15.45%	-6.14%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	9.31%	19.65%	-10.34%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	9.31%	21.02%	-11.71%

ATGAX vs. VSPMX - Expense Ratio Comparison

ATGAX has a 1.50% expense ratio, which is higher than VSPMX's 0.08% expense ratio.

Dividends

ATGAX vs. VSPMX - Dividend Comparison

ATGAX has not paid dividends to shareholders, while VSPMX's dividend yield for the trailing twelve months is around 1.23%.

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%
VSPMX Vanguard S&P Mid-Cap 400 Index Fund Institutional Shares	1.23%	1.07%	1.32%	1.26%	1.59%	1.15%	1.24%	1.49%	1.64%	1.27%	1.54%	1.52%

Frequently Asked Questions

Can I hold both ATGAX and VSPMX in my portfolio?

ATGAX and VSPMX have a correlation of -1.00, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.