FASNX vs. AFB

Last updated Jun 23, 2026

FASNX (Fidelity Advisor Sustainable Intermediate Municipal Income Fund Class C) and AFB (AllianceBernstein National Municipal Income Fund) are both Municipal Bonds funds. Over the past 3 years, FASNX returned 2.93%/yr vs 6.85%/yr for AFB. At a 0.46 correlation, their price movements are largely independent. FASNX charges 1.37%/yr vs 1.56%/yr for AFB.

Performance

FASNX vs. AFB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Advisor Sustainable Intermediate Municipal Income Fund Class C (FASNX) 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, FASNX achieves a 0.45% return, which is significantly lower than AFB's 7.53% return.

FASNX

• 1D: 0.00%
• 1M: 1.26%
• YTD: 0.45%
• 6M: 0.79%
• 1Y: 4.78%
• 3Y*: 2.93%
• 5Y*: —
• 10Y*: —

AFB

• 1D: -0.53%
• 1M: 3.84%
• YTD: 7.53%
• 6M: 8.03%
• 1Y: 17.26%
• 3Y*: 6.85%
• 5Y*: -1.45%
• 10Y*: 1.53%

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

FASNX vs. AFB - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
FASNX Fidelity Advisor Sustainable Intermediate Municipal Income Fund Class C	0.45%	4.37%	0.28%	5.03%	-0.29%
AFB AllianceBernstein National Municipal Income Fund	7.53%	4.41%	4.10%	7.41%	-7.17%

Correlation

The correlation between FASNX and AFB is 0.38, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.38
Correlation (3Y) Calculated over the trailing 3-year period	0.50
Correlation (All Time) Calculated using the full available price history since Apr 27, 2022	0.46

The correlation between FASNX and AFB shifts across timeframes, from 0.38 (1 year) to 0.50 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

FASNX vs. AFB — Risk / Return Rank

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

FASNX

FASNX Risk / Return Rank: 50
FASNX Sharpe Ratio Rank: 59
FASNX Sortino Ratio Rank: 66
FASNX Omega Ratio Rank: 85
FASNX Calmar Ratio Rank: 21
FASNX Martin Ratio Rank: 20

AFB

AFB Risk / Return Rank: 67
AFB Sharpe Ratio Rank: 64
AFB Sortino Ratio Rank: 79
AFB Omega Ratio Rank: 69
AFB Calmar Ratio Rank: 63
AFB Martin Ratio Rank: 58

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.

FASNX vs. AFB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Advisor Sustainable Intermediate Municipal Income Fund Class C (FASNX) 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	FASNX	AFB	Difference
Sharpe ratio: Return per unit of total volatility	2.08	2.15	-0.07
Sortino ratio: Return per unit of downside risk	3.09	3.45	-0.37
Omega ratio: Gain probability vs. loss probability	1.53	1.42	+0.11
Calmar ratio: Return relative to maximum drawdown	1.57	2.91	-1.34
Martin ratio: Return relative to average drawdown	4.65	10.95	-6.30

FASNX vs. AFB - Sharpe Ratio Comparison

The current FASNX Sharpe Ratio is 2.08, which is comparable to the AFB Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of FASNX 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.

Drawdowns

FASNX vs. AFB - Drawdown Comparison

The maximum FASNX drawdown since its inception was -6.12%, smaller than the maximum AFB drawdown of -50.98%. Use the drawdown chart below to compare losses from any high point for FASNX and AFB.

Drawdown Indicators

	FASNX	AFB	Difference
Max Drawdown Largest peak-to-trough decline	-6.12%	-50.98%	+44.86%
Max Drawdown (1Y) Largest decline over 1 year	-3.06%	-5.96%	+2.90%
Max Drawdown (3Y) Largest decline over 3 years	-4.51%	-16.32%	+11.81%
Max Drawdown (5Y) Largest decline over 5 years	—	-35.17%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-35.17%	—
Current Drawdown Current decline from peak	-1.27%	-8.44%	+7.17%
Average Drawdown Average peak-to-trough decline	-1.47%	-8.98%	+7.51%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.03%	1.58%	-0.55%

Volatility

FASNX vs. AFB - Volatility Comparison

The current volatility for Fidelity Advisor Sustainable Intermediate Municipal Income Fund Class C (FASNX) is 0.59%, while AllianceBernstein National Municipal Income Fund (AFB) has a volatility of 2.72%. This indicates that FASNX 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

	FASNX	AFB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.59%	2.72%	-2.13%
Volatility (6M) Calculated over the trailing 6-month period	1.82%	6.05%	-4.23%
Volatility (1Y) Calculated over the trailing 1-year period	2.31%	8.08%	-5.77%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.46%	10.97%	-7.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.46%	11.26%	-7.80%

FASNX vs. AFB - Expense Ratio Comparison

FASNX has a 1.37% expense ratio, which is lower than AFB's 1.56% expense ratio.

Dividends

FASNX vs. AFB - Dividend Comparison

FASNX's dividend yield for the trailing twelve months is around 2.83%, less than AFB's 5.07% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AFB AllianceBernstein National Municipal Income Fund	5.07%	4.72%	3.83%	3.62%	5.26%	4.32%	4.18%	3.93%	4.53%	4.71%	5.34%	5.80%
FASNX Fidelity Advisor Sustainable Intermediate Municipal Income Fund Class C	2.83%	2.83%	2.80%	2.35%	1.01%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FASNX and AFB in my portfolio?

FASNX and AFB have a correlation of 0.38, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FASNX or AFB?

AFB has higher volatility (2.72%) compared to FASNX (0.59%). In terms of maximum drawdown, FASNX dropped -6.12% vs AFB's -50.98%.

Which has better risk-adjusted returns?

AFB currently has the higher Sharpe Ratio (2.15 vs 2.08), 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.