BMSLX vs. ATGAX

Last updated Jun 5, 2026

BMSLX (MFS Blended Research Mid Cap Equity Fund) and ATGAX (Aquila Opportunity Growth Fund) are both Mid Cap Blend Equities funds. Their correlation of 0.80 suggests significant overlap in exposure. BMSLX charges 0.59%/yr vs 1.50%/yr for ATGAX.

Performance

BMSLX vs. ATGAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Blended Research Mid Cap Equity Fund (BMSLX) and Aquila Opportunity Growth Fund (ATGAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

BMSLX

• 1D: -0.24%
• 1M: 4.15%
• YTD: 13.64%
• 6M: 13.28%
• 1Y: 21.45%
• 3Y*: 18.87%
• 5Y*: 10.49%
• 10Y*: —

ATGAX

• 1D: -0.36%
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

BMSLX vs. ATGAX - Yearly Performance Comparison

	2026 (YTD)
BMSLX MFS Blended Research Mid Cap Equity Fund	1.51%
ATGAX Aquila Opportunity Growth Fund	1.66%

Correlation

The correlation between BMSLX and ATGAX is 0.80, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (All Time) Calculated using the full available price history since May 29, 2026	0.80

Return for Risk

BMSLX vs. ATGAX — Risk / Return Rank

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

BMSLX

BMSLX Risk / Return Rank: 32
BMSLX Sharpe Ratio Rank: 28
BMSLX Sortino Ratio Rank: 29
BMSLX Omega Ratio Rank: 27
BMSLX Calmar Ratio Rank: 39
BMSLX Martin Ratio Rank: 37

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.

BMSLX vs. ATGAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Blended Research Mid Cap Equity Fund (BMSLX) 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.

	BMSLX	ATGAX	Difference
Sharpe ratio: Return per unit of total volatility	1.50	—	—
Sortino ratio: Return per unit of downside risk	2.24	—	—
Omega ratio: Gain probability vs. loss probability	1.27	—	—
Calmar ratio: Return relative to maximum drawdown	2.34	—	—
Martin ratio: Return relative to average drawdown	8.00	—	—
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

	BMSLX	ATGAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.50	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.57	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.60	18.80	-18.20

Drawdowns

BMSLX vs. ATGAX - Drawdown Comparison

The maximum BMSLX drawdown since its inception was -41.06%, which is greater than ATGAX's maximum drawdown of -0.36%. Use the drawdown chart below to compare losses from any high point for BMSLX and ATGAX.

Drawdown Indicators

	BMSLX	ATGAX	Difference
Max Drawdown Largest peak-to-trough decline	-41.06%	-0.36%	-40.70%
Max Drawdown (1Y) Largest decline over 1 year	-9.17%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-22.28%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-22.28%	—	—
Current Drawdown Current decline from peak	-0.24%	-0.36%	+0.12%
Average Drawdown Average peak-to-trough decline	-5.05%	-0.09%	-4.96%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.68%	—	—

Volatility

Volatility by Period

	BMSLX	ATGAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.71%	—	—
Volatility (6M) Calculated over the trailing 6-month period	10.72%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	14.31%	11.18%	+3.13%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.43%	11.18%	+7.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.72%	11.18%	+8.54%

BMSLX vs. ATGAX - Expense Ratio Comparison

BMSLX has a 0.59% expense ratio, which is lower than ATGAX's 1.50% expense ratio.

Dividends

BMSLX vs. ATGAX - Dividend Comparison

BMSLX's dividend yield for the trailing twelve months is around 2.71%, 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%
BMSLX MFS Blended Research Mid Cap Equity Fund	2.71%	3.08%	10.98%	2.32%	5.15%	23.06%	0.94%	4.90%	8.27%	2.63%	0.47%

Frequently Asked Questions

Can I hold both BMSLX and ATGAX in my portfolio?

BMSLX and ATGAX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.