THNYX vs. AFB

Last updated Jun 4, 2026

THNYX (Thornburg New York Intermediate Municipal Bond Fund) and AFB (AllianceBernstein National Municipal Income Fund) are both Municipal Bonds funds. Over the past 10 years, THNYX returned 1.47%/yr vs 1.60%/yr for AFB. At a 0.27 correlation, their price movements are largely independent. THNYX charges 0.99%/yr vs 1.56%/yr for AFB.

Performance

THNYX vs. AFB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thornburg New York Intermediate Municipal Bond Fund (THNYX) and AllianceBernstein National Municipal Income Fund (AFB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, THNYX achieves a 1.63% return, which is significantly lower than AFB's 6.20% return. Over the past 10 years, THNYX has underperformed AFB with an annualized return of 1.47%, while AFB has yielded a comparatively higher 1.60% annualized return.

THNYX

• 1D: 0.17%
• 1M: 0.59%
• YTD: 1.63%
• 6M: 1.80%
• 1Y: 6.25%
• 3Y*: 3.75%
• 5Y*: 1.24%
• 10Y*: 1.47%

AFB

• 1D: -0.09%
• 1M: 1.72%
• YTD: 6.20%
• 6M: 5.81%
• 1Y: 15.69%
• 3Y*: 7.29%
• 5Y*: -1.26%
• 10Y*: 1.60%

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

THNYX vs. AFB - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
THNYX Thornburg New York Intermediate Municipal Bond Fund	1.63%	4.91%	1.55%	4.29%	-5.82%	0.33%	2.99%	4.76%	0.30%	2.67%
AFB AllianceBernstein National Municipal Income Fund	6.20%	4.41%	4.10%	7.41%	-25.93%	7.25%	7.80%	20.13%	-5.43%	6.15%

Correlation

The correlation between THNYX and AFB is 0.40, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.40
Correlation (3Y) Calculated over the trailing 3-year period	0.48
Correlation (5Y) Calculated over the trailing 5-year period	0.42
Correlation (10Y) Calculated over the trailing 10-year period	0.35
Correlation (All Time) Calculated using the full available price history since Jan 30, 2002	0.27

The correlation between THNYX and AFB shifts across timeframes, from 0.27 (all time) to 0.48 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

THNYX vs. AFB — Risk / Return Rank

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

THNYX

THNYX Risk / Return Rank: 76
THNYX Sharpe Ratio Rank: 87
THNYX Sortino Ratio Rank: 92
THNYX Omega Ratio Rank: 94
THNYX Calmar Ratio Rank: 57
THNYX Martin Ratio Rank: 49

AFB

AFB Risk / Return Rank: 50
AFB Sharpe Ratio Rank: 46
AFB Sortino Ratio Rank: 59
AFB Omega Ratio Rank: 50
AFB Calmar Ratio Rank: 48
AFB Martin Ratio Rank: 48

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.

THNYX vs. AFB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thornburg New York Intermediate Municipal Bond Fund (THNYX) and AllianceBernstein National Municipal Income Fund (AFB). 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.

	THNYX	AFB	Difference
Sharpe ratio Return per unit of total volatility	2.87	2.01	+0.86
Sortino ratio Return per unit of downside risk	4.65	3.26	+1.39
Omega ratio Gain probability vs. loss probability	1.74	1.39	+0.35
Calmar ratio Return relative to maximum drawdown	2.89	2.64	+0.25
Martin ratio Return relative to average drawdown	10.17	9.98	+0.19
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

THNYX vs. AFB - Sharpe Ratio Comparison

The current THNYX Sharpe Ratio is 2.87, which is higher than the AFB Sharpe Ratio of 2.01. The chart below compares the historical Sharpe Ratios of THNYX and AFB, 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

	THNYX	AFB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.87	2.01	+0.86
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.42	-0.12	+0.53
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.47	0.14	+0.33
Sharpe Ratio (All Time) Calculated using the full available price history	1.13	0.33	+0.81

Drawdowns

THNYX vs. AFB - Drawdown Comparison

The maximum THNYX drawdown since its inception was -9.88%, smaller than the maximum AFB drawdown of -50.98%. Use the drawdown chart below to compare losses from any high point for THNYX and AFB.

Drawdown Indicators

	THNYX	AFB	Difference
Max Drawdown Largest peak-to-trough decline	-9.88%	-50.98%	+41.10%
Max Drawdown (1Y) Largest decline over 1 year	-2.14%	-5.96%	+3.82%
Max Drawdown (3Y) Largest decline over 3 years	-4.10%	-16.32%	+12.22%
Max Drawdown (5Y) Largest decline over 5 years	-9.21%	-35.17%	+25.96%
Max Drawdown (10Y) Largest decline over 10 years	-9.88%	-35.17%	+25.29%
Current Drawdown Current decline from peak	-0.22%	-9.57%	+9.35%
Average Drawdown Average peak-to-trough decline	-1.32%	-8.98%	+7.66%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.61%	1.58%	-0.97%

Volatility

THNYX vs. AFB - Volatility Comparison

The current volatility for Thornburg New York Intermediate Municipal Bond Fund (THNYX) is 0.74%, while AllianceBernstein National Municipal Income Fund (AFB) has a volatility of 2.64%. This indicates that THNYX experiences smaller price fluctuations and is considered to be less risky than AFB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	THNYX	AFB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.74%	2.64%	-1.90%
Volatility (6M) Calculated over the trailing 6-month period	1.51%	5.73%	-4.22%
Volatility (1Y) Calculated over the trailing 1-year period	2.16%	7.88%	-5.72%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.97%	10.94%	-7.97%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.12%	11.24%	-8.12%

THNYX vs. AFB - Expense Ratio Comparison

THNYX has a 0.99% expense ratio, which is lower than AFB's 1.56% expense ratio.

Dividends

THNYX vs. AFB - Dividend Comparison

THNYX's dividend yield for the trailing twelve months is around 3.08%, less than AFB's 5.02% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AFB AllianceBernstein National Municipal Income Fund	5.02%	4.72%	3.83%	3.62%	5.26%	4.32%	4.18%	3.93%	4.53%	4.71%	5.34%	5.80%
THNYX Thornburg New York Intermediate Municipal Bond Fund	3.08%	4.06%	3.39%	2.00%	1.95%	1.80%	1.94%	2.45%	2.57%	2.49%	2.31%	2.15%

Frequently Asked Questions

Can I hold both THNYX and AFB in my portfolio?

THNYX and AFB have a correlation of 0.40, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, THNYX or AFB?

AFB has higher volatility (2.64%) compared to THNYX (0.74%). In terms of maximum drawdown, THNYX dropped -9.88% vs AFB's -50.98%.

Which has better risk-adjusted returns?

THNYX currently has the higher Sharpe Ratio (2.87 vs 2.01), 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.