OPTAX vs. ACSTX

Last updated Jun 5, 2026

OPTAX (Invesco AMT-Free Municipal Fund) and ACSTX (Invesco Comstock Fund) are both mutual funds - OPTAX is a Municipal Bonds fund managed by Invesco, while ACSTX is a Large Cap Value Equities fund managed by Invesco. Over the past 10 years, OPTAX returned 3.54%/yr vs 12.54%/yr for ACSTX. At a 0.02 correlation, their price movements are largely independent. OPTAX charges 0.75%/yr vs 0.80%/yr for ACSTX.

Performance

OPTAX vs. ACSTX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco AMT-Free Municipal Fund (OPTAX) and Invesco Comstock Fund (ACSTX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OPTAX achieves a 1.51% return, which is significantly lower than ACSTX's 8.97% return. Over the past 10 years, OPTAX has underperformed ACSTX with an annualized return of 3.54%, while ACSTX has yielded a comparatively higher 12.54% annualized return.

OPTAX

• 1D: 0.00%
• 1M: 0.80%
• YTD: 1.51%
• 6M: 1.71%
• 1Y: 6.07%
• 3Y*: 3.19%
• 5Y*: 0.19%
• 10Y*: 3.54%

ACSTX

• 1D: -0.15%
• 1M: 2.11%
• YTD: 8.97%
• 6M: 10.49%
• 1Y: 23.48%
• 3Y*: 18.00%
• 5Y*: 11.58%
• 10Y*: 12.54%

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

OPTAX vs. ACSTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OPTAX Invesco AMT-Free Municipal Fund	1.51%	2.70%	2.13%	6.64%	-12.15%	4.16%	7.57%	12.33%	7.43%	5.98%
ACSTX Invesco Comstock Fund	8.97%	17.22%	15.00%	12.37%	0.74%	33.33%	-0.78%	24.35%	-12.34%	17.75%

Correlation

The correlation between OPTAX and ACSTX is 0.18, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.18
Correlation (3Y) Calculated over the trailing 3-year period	0.13
Correlation (5Y) Calculated over the trailing 5-year period	0.05
Correlation (10Y) Calculated over the trailing 10-year period	-0.04
Correlation (All Time) Calculated using the full available price history since Jan 3, 1980	0.02

The correlation between OPTAX and ACSTX shifts across timeframes, from -0.04 (10 years) to 0.18 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

OPTAX vs. ACSTX — Risk / Return Rank

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

OPTAX

OPTAX Risk / Return Rank: 48
OPTAX Sharpe Ratio Rank: 45
OPTAX Sortino Ratio Rank: 52
OPTAX Omega Ratio Rank: 67
OPTAX Calmar Ratio Rank: 41
OPTAX Martin Ratio Rank: 35

ACSTX

ACSTX Risk / Return Rank: 55
ACSTX Sharpe Ratio Rank: 54
ACSTX Sortino Ratio Rank: 56
ACSTX Omega Ratio Rank: 51
ACSTX Calmar Ratio Rank: 59
ACSTX Martin Ratio Rank: 56

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.

OPTAX vs. ACSTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco AMT-Free Municipal Fund (OPTAX) and Invesco Comstock Fund (ACSTX). 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.

	OPTAX	ACSTX	Difference
Sharpe ratio: Return per unit of total volatility	1.96	2.18	-0.22
Sortino ratio: Return per unit of downside risk	3.02	3.16	-0.14
Omega ratio: Gain probability vs. loss probability	1.45	1.39	+0.06
Calmar ratio: Return relative to maximum drawdown	2.42	2.95	-0.53
Martin ratio: Return relative to average drawdown	7.80	11.21	-3.41
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OPTAX vs. ACSTX - Sharpe Ratio Comparison

The current OPTAX Sharpe Ratio is 1.96, which is comparable to the ACSTX Sharpe Ratio of 2.18. The chart below compares the historical Sharpe Ratios of OPTAX and ACSTX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	OPTAX	ACSTX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.96	2.18	-0.22
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.04	0.76	-0.72
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.74	0.65	+0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.77	0.51	+0.26

Drawdowns

OPTAX vs. ACSTX - Drawdown Comparison

The maximum OPTAX drawdown since its inception was -48.56%, smaller than the maximum ACSTX drawdown of -58.61%. Use the drawdown chart below to compare losses from any high point for OPTAX and ACSTX.

Drawdown Indicators

	OPTAX	ACSTX	Difference
Max Drawdown Largest peak-to-trough decline	-48.56%	-58.61%	+10.05%
Max Drawdown (1Y) Largest decline over 1 year	-2.93%	-8.02%	+5.09%
Max Drawdown (3Y) Largest decline over 3 years	-7.93%	-15.61%	+7.68%
Max Drawdown (5Y) Largest decline over 5 years	-17.30%	-17.25%	-0.05%
Max Drawdown (10Y) Largest decline over 10 years	-17.30%	-44.80%	+27.50%
Current Drawdown Current decline from peak	-0.37%	-0.39%	+0.02%
Average Drawdown Average peak-to-trough decline	-6.37%	-9.35%	+2.98%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.96%	2.10%	-1.14%

Volatility

OPTAX vs. ACSTX - Volatility Comparison

The current volatility for Invesco AMT-Free Municipal Fund (OPTAX) is 1.41%, while Invesco Comstock Fund (ACSTX) has a volatility of 2.30%. This indicates that OPTAX experiences smaller price fluctuations and is considered to be less risky than ACSTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OPTAX	ACSTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.41%	2.30%	-0.89%
Volatility (6M) Calculated over the trailing 6-month period	2.54%	8.00%	-5.46%
Volatility (1Y) Calculated over the trailing 1-year period	3.62%	10.84%	-7.22%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.03%	15.41%	-10.38%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.87%	19.45%	-14.58%

OPTAX vs. ACSTX - Expense Ratio Comparison

OPTAX has a 0.75% expense ratio, which is lower than ACSTX's 0.80% expense ratio.

Dividends

OPTAX vs. ACSTX - Dividend Comparison

OPTAX's dividend yield for the trailing twelve months is around 2.68%, less than ACSTX's 8.11% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACSTX Invesco Comstock Fund	8.11%	8.79%	10.17%	8.44%	13.00%	8.66%	2.05%	6.66%	10.03%	3.60%	6.98%	1.10%
OPTAX Invesco AMT-Free Municipal Fund	2.68%	4.23%	4.16%	3.02%	2.99%	3.43%	3.80%	3.75%	3.82%	4.71%	5.77%	6.05%

Frequently Asked Questions

Can I hold both OPTAX and ACSTX in my portfolio?

OPTAX and ACSTX have a correlation of 0.18, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OPTAX or ACSTX?

ACSTX has higher volatility (2.30%) compared to OPTAX (1.41%). In terms of maximum drawdown, OPTAX dropped -48.56% vs ACSTX's -58.61%.

Which has better risk-adjusted returns?

ACSTX currently has the higher Sharpe Ratio (2.18 vs 1.96), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.