ABTYX vs. STMYX

Last updated Jun 4, 2026

ABTYX (AB High Income Municipal Portfolio) and STMYX (Sierra Tactical Municipal Fund) are both High Yield Muni funds. Over the past 5 years, ABTYX returned 0.69%/yr vs 0.94%/yr for STMYX. A 0.74 correlation means they provide meaningful diversification when combined. ABTYX charges 0.53%/yr vs 0.92%/yr for STMYX.

Performance

ABTYX vs. STMYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AB High Income Municipal Portfolio (ABTYX) and Sierra Tactical Municipal Fund (STMYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ABTYX achieves a 2.23% return, which is significantly higher than STMYX's 1.82% return.

ABTYX

• 1D: 0.29%
• 1M: 1.15%
• YTD: 2.23%
• 6M: 2.62%
• 1Y: 8.58%
• 3Y*: 5.33%
• 5Y*: 0.69%
• 10Y*: 2.89%

STMYX

• 1D: 0.25%
• 1M: 0.91%
• YTD: 1.82%
• 6M: 1.99%
• 1Y: 6.05%
• 3Y*: 2.46%
• 5Y*: 0.94%
• 10Y*: —

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

ABTYX vs. STMYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
ABTYX AB High Income Municipal Portfolio	2.23%	5.88%	4.64%	5.49%	-15.49%	5.73%	5.08%	10.81%
STMYX Sierra Tactical Municipal Fund	1.82%	-1.09%	2.00%	4.29%	-2.93%	3.35%	4.35%	7.73%

Correlation

The correlation between ABTYX and STMYX is 0.87, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.87
Correlation (3Y) Calculated over the trailing 3-year period	0.83
Correlation (5Y) Calculated over the trailing 5-year period	0.76
Correlation (All Time) Calculated using the full available price history since Jan 4, 2019	0.74

The correlation between ABTYX and STMYX shifts across timeframes, from 0.74 (all time) to 0.87 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

ABTYX vs. STMYX — Risk / Return Rank

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

ABTYX

ABTYX Risk / Return Rank: 51
ABTYX Sharpe Ratio Rank: 54
ABTYX Sortino Ratio Rank: 62
ABTYX Omega Ratio Rank: 69
ABTYX Calmar Ratio Rank: 35
ABTYX Martin Ratio Rank: 33

STMYX

STMYX Risk / Return Rank: 55
STMYX Sharpe Ratio Rank: 61
STMYX Sortino Ratio Rank: 59
STMYX Omega Ratio Rank: 82
STMYX Calmar Ratio Rank: 39
STMYX Martin Ratio Rank: 34

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.

ABTYX vs. STMYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AB High Income Municipal Portfolio (ABTYX) and Sierra Tactical Municipal Fund (STMYX). 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.

	ABTYX	STMYX	Difference
Sharpe ratio: Return per unit of total volatility	2.16	2.30	-0.14
Sortino ratio: Return per unit of downside risk	3.31	3.23	+0.08
Omega ratio: Gain probability vs. loss probability	1.46	1.55	-0.08
Calmar ratio: Return relative to maximum drawdown	2.23	2.37	-0.15
Martin ratio: Return relative to average drawdown	7.49	7.65	-0.17
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ABTYX vs. STMYX - Sharpe Ratio Comparison

The current ABTYX Sharpe Ratio is 2.16, which is comparable to the STMYX Sharpe Ratio of 2.30. The chart below compares the historical Sharpe Ratios of ABTYX and STMYX, 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

	ABTYX	STMYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.16	2.30	-0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.11	0.24	-0.13
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.51	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.98	0.70	+0.28

Drawdowns

ABTYX vs. STMYX - Drawdown Comparison

The maximum ABTYX drawdown since its inception was -21.44%, which is greater than STMYX's maximum drawdown of -9.71%. Use the drawdown chart below to compare losses from any high point for ABTYX and STMYX.

Drawdown Indicators

	ABTYX	STMYX	Difference
Max Drawdown Largest peak-to-trough decline	-21.44%	-9.71%	-11.73%
Max Drawdown (1Y) Largest decline over 1 year	-3.82%	-2.55%	-1.27%
Max Drawdown (3Y) Largest decline over 3 years	-9.37%	-7.74%	-1.63%
Max Drawdown (5Y) Largest decline over 5 years	-21.44%	-8.59%	-12.85%
Max Drawdown (10Y) Largest decline over 10 years	-21.44%	—	—
Current Drawdown Current decline from peak	-0.42%	-1.21%	+0.79%
Average Drawdown Average peak-to-trough decline	-3.96%	-3.15%	-0.81%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.13%	0.79%	+0.34%

Volatility

ABTYX vs. STMYX - Volatility Comparison

AB High Income Municipal Portfolio (ABTYX) has a higher volatility of 1.53% compared to Sierra Tactical Municipal Fund (STMYX) at 1.09%. This indicates that ABTYX's price experiences larger fluctuations and is considered to be riskier than STMYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ABTYX	STMYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.53%	1.09%	+0.44%
Volatility (6M) Calculated over the trailing 6-month period	2.94%	1.93%	+1.01%
Volatility (1Y) Calculated over the trailing 1-year period	3.95%	2.64%	+1.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.06%	3.89%	+2.17%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.63%	3.71%	+1.92%

ABTYX vs. STMYX - Expense Ratio Comparison

ABTYX has a 0.53% expense ratio, which is lower than STMYX's 0.92% expense ratio.

Dividends

ABTYX vs. STMYX - Dividend Comparison

ABTYX's dividend yield for the trailing twelve months is around 4.61%, more than STMYX's 3.61% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ABTYX AB High Income Municipal Portfolio	4.61%	5.93%	4.15%	3.10%	3.91%	2.59%	3.70%	4.27%	4.60%	4.20%	4.48%	4.69%
STMYX Sierra Tactical Municipal Fund	3.61%	3.44%	3.03%	2.46%	1.13%	4.78%	2.47%	2.67%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both ABTYX and STMYX in my portfolio?

ABTYX and STMYX have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ABTYX or STMYX?

ABTYX has higher volatility (1.53%) compared to STMYX (1.09%). In terms of maximum drawdown, ABTYX dropped -21.44% vs STMYX's -9.71%.

Which has better risk-adjusted returns?

STMYX currently has the higher Sharpe Ratio (2.30 vs 2.16), 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.