STMYX vs. ABTYX

Last updated Jun 3, 2026

STMYX (Sierra Tactical Municipal Fund) and ABTYX (AB High Income Municipal Portfolio) are both High Yield Muni funds. Over the past 5 years, STMYX returned 0.91%/yr vs 0.65%/yr for ABTYX. A 0.74 correlation means they provide meaningful diversification when combined. STMYX charges 0.92%/yr vs 0.53%/yr for ABTYX.

Performance

STMYX vs. ABTYX - Performance Comparison

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

Returns By Period

In the year-to-date period, STMYX achieves a 1.57% return, which is significantly lower than ABTYX's 1.93% return.

STMYX

• 1D: 0.00%
• 1M: 0.57%
• YTD: 1.57%
• 6M: 1.78%
• 1Y: 5.74%
• 3Y*: 2.37%
• 5Y*: 0.91%
• 10Y*: —

ABTYX

• 1D: -0.10%
• 1M: 0.66%
• YTD: 1.93%
• 6M: 2.42%
• 1Y: 8.15%
• 3Y*: 5.23%
• 5Y*: 0.65%
• 10Y*: 2.86%

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

STMYX vs. ABTYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
STMYX Sierra Tactical Municipal Fund	1.57%	-1.09%	2.00%	4.29%	-2.93%	3.35%	4.35%	7.73%
ABTYX AB High Income Municipal Portfolio	1.93%	5.88%	4.64%	5.49%	-15.49%	5.73%	5.08%	10.81%

Correlation

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

Return for Risk

STMYX vs. ABTYX — Risk / Return Rank

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

STMYX

STMYX Risk / Return Rank: 46
STMYX Sharpe Ratio Rank: 51
STMYX Sortino Ratio Rank: 48
STMYX Omega Ratio Rank: 74
STMYX Calmar Ratio Rank: 30
STMYX Martin Ratio Rank: 28

ABTYX

ABTYX Risk / Return Rank: 43
ABTYX Sharpe Ratio Rank: 45
ABTYX Sortino Ratio Rank: 50
ABTYX Omega Ratio Rank: 56
ABTYX Calmar Ratio Rank: 31
ABTYX Martin Ratio Rank: 30

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.

STMYX vs. ABTYX - Risk-Adjusted Trends Comparison

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

	STMYX	ABTYX	Difference
Sharpe ratio Return per unit of total volatility	2.10	1.97	+0.13
Sortino ratio Return per unit of downside risk	2.93	2.99	-0.06
Omega ratio Gain probability vs. loss probability	1.49	1.42	+0.07
Calmar ratio Return relative to maximum drawdown	2.09	2.13	-0.04
Martin ratio Return relative to average drawdown	6.75	7.16	-0.41
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

STMYX vs. ABTYX - Sharpe Ratio Comparison

The current STMYX Sharpe Ratio is 2.10, which is comparable to the ABTYX Sharpe Ratio of 1.97. The chart below compares the historical Sharpe Ratios of STMYX and ABTYX, 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

	STMYX	ABTYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.10	1.97	+0.13
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.23	0.11	+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	0.69	0.97	-0.28

Drawdowns

STMYX vs. ABTYX - Drawdown Comparison

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

Drawdown Indicators

	STMYX	ABTYX	Difference
Max Drawdown Largest peak-to-trough decline	-9.71%	-21.44%	+11.73%
Max Drawdown (1Y) Largest decline over 1 year	-2.55%	-3.82%	+1.27%
Max Drawdown (3Y) Largest decline over 3 years	-7.74%	-9.37%	+1.63%
Max Drawdown (5Y) Largest decline over 5 years	-8.59%	-21.44%	+12.85%
Max Drawdown (10Y) Largest decline over 10 years	—	-21.44%	—
Current Drawdown Current decline from peak	-1.45%	-0.71%	-0.74%
Average Drawdown Average peak-to-trough decline	-3.15%	-3.96%	+0.81%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.79%	1.14%	-0.35%

Volatility

STMYX vs. ABTYX - Volatility Comparison

The current volatility for Sierra Tactical Municipal Fund (STMYX) is 1.07%, while AB High Income Municipal Portfolio (ABTYX) has a volatility of 1.51%. This indicates that STMYX experiences smaller price fluctuations and is considered to be less risky than ABTYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	STMYX	ABTYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.07%	1.51%	-0.44%
Volatility (6M) Calculated over the trailing 6-month period	1.92%	2.94%	-1.02%
Volatility (1Y) Calculated over the trailing 1-year period	2.64%	3.95%	-1.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.89%	6.06%	-2.17%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.71%	5.62%	-1.91%

STMYX vs. ABTYX - Expense Ratio Comparison

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

Dividends

STMYX vs. ABTYX - Dividend Comparison

STMYX's dividend yield for the trailing twelve months is around 3.61%, less than ABTYX's 4.62% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ABTYX AB High Income Municipal Portfolio	4.62%	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 STMYX and ABTYX in my portfolio?

STMYX and ABTYX 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, STMYX or ABTYX?

ABTYX has higher volatility (1.51%) compared to STMYX (1.07%). In terms of maximum drawdown, STMYX dropped -9.71% vs ABTYX's -21.44%.

Which has better risk-adjusted returns?

STMYX currently has the higher Sharpe Ratio (2.10 vs 1.97), 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.