SSMKX vs. ATGAX

Last updated Jun 4, 2026

SSMKX (State Street Small/Mid Cap Equity Index Fund) and ATGAX (Aquila Opportunity Growth Fund) are both Mid Cap Blend Equities funds. With a 1.00 correlation, they move nearly in lockstep. SSMKX charges 0.04%/yr vs 1.50%/yr for ATGAX.

Performance

SSMKX vs. ATGAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street Small/Mid Cap Equity Index Fund (SSMKX) and Aquila Opportunity Growth Fund (ATGAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

SSMKX

• 1D: 1.00%
• 1M: 5.71%
• YTD: 14.17%
• 6M: 13.00%
• 1Y: 29.82%
• 3Y*: 20.36%
• 5Y*: 7.43%
• 10Y*: 12.48%

ATGAX

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

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

SSMKX vs. ATGAX - Yearly Performance Comparison

	2026 (YTD)
SSMKX State Street Small/Mid Cap Equity Index Fund	1.26%
ATGAX Aquila Opportunity Growth Fund	2.03%

Correlation

The correlation between SSMKX 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

SSMKX vs. ATGAX — Risk / Return Rank

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

SSMKX

SSMKX Risk / Return Rank: 48
SSMKX Sharpe Ratio Rank: 42
SSMKX Sortino Ratio Rank: 40
SSMKX Omega Ratio Rank: 37
SSMKX Calmar Ratio Rank: 67
SSMKX Martin Ratio Rank: 57

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.

SSMKX vs. ATGAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Small/Mid Cap Equity Index Fund (SSMKX) 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.

	SSMKX	ATGAX	Difference
Sharpe ratio: Return per unit of total volatility	1.88	—	—
Sortino ratio: Return per unit of downside risk	2.63	—	—
Omega ratio: Gain probability vs. loss probability	1.32	—	—
Calmar ratio: Return relative to maximum drawdown	3.16	—	—
Martin ratio: Return relative to average drawdown	11.48	—	—
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

	SSMKX	ATGAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.88	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.34	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.57	58.33	-57.77

Drawdowns

SSMKX vs. ATGAX - Drawdown Comparison

The maximum SSMKX drawdown since its inception was -41.65%, which is greater than ATGAX's maximum drawdown of 0.00%. Use the drawdown chart below to compare losses from any high point for SSMKX and ATGAX.

Drawdown Indicators

	SSMKX	ATGAX	Difference
Max Drawdown Largest peak-to-trough decline	-41.65%	0.00%	-41.65%
Max Drawdown (1Y) Largest decline over 1 year	-10.03%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-26.31%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-35.19%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-41.65%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-8.70%	0.00%	-8.70%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.76%	—	—

Volatility

Volatility by Period

	SSMKX	ATGAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.70%	—	—
Volatility (6M) Calculated over the trailing 6-month period	12.35%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	16.90%	9.26%	+7.64%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.25%	9.26%	+12.99%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.26%	9.26%	+13.00%

SSMKX vs. ATGAX - Expense Ratio Comparison

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

Dividends

SSMKX vs. ATGAX - Dividend Comparison

SSMKX's dividend yield for the trailing twelve months is around 4.47%, while ATGAX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
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%
SSMKX State Street Small/Mid Cap Equity Index Fund	4.47%	5.10%	2.12%	2.56%	17.09%	9.69%	1.47%	5.75%	3.68%	5.52%	1.30%

Frequently Asked Questions

Can I hold both SSMKX and ATGAX in my portfolio?

With a correlation of 1.00, SSMKX 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.