BMN vs. MMIBX

Last updated Apr 2, 2026

Compare and contrast key facts about Blackrock 2037 Municipal Target Term Trust (BMN) and MFS Municipal Income Fund (MMIBX).

BMN is an actively managed fund by BlackRock. It was launched on Oct 28, 2022. MMIBX is managed by MFS. It was launched on Dec 28, 1986.

Performance

BMN vs. MMIBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Blackrock 2037 Municipal Target Term Trust (BMN) and MFS Municipal Income Fund (MMIBX). The values are adjusted to include any dividend payments, if applicable.

BMN vs. MMIBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
BMN Blackrock 2037 Municipal Target Term Trust	1.11%	7.05%	12.65%	1.89%	-2.55%
MMIBX MFS Municipal Income Fund	-0.62%	3.56%	2.42%	5.45%	5.03%

Returns By Period

In the year-to-date period, BMN achieves a 1.11% return, which is significantly higher than MMIBX's -0.62% return.

BMN

• 1D: 0.96%
• 1M: -4.53%
• YTD: 1.11%
• 6M: 6.76%
• 1Y: 9.12%
• 3Y*: 6.05%
• 5Y*: —
• 10Y*: —

MMIBX

• 1D: 0.25%
• 1M: -2.17%
• YTD: -0.62%
• 6M: 0.61%
• 1Y: 2.38%
• 3Y*: 2.71%
• 5Y*: -0.07%
• 10Y*: 1.42%

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

BMN vs. MMIBX - Expense Ratio Comparison

BMN has a 0.93% expense ratio, which is lower than MMIBX's 1.45% expense ratio.

MMIBX

MFS Municipal Income Fund

BMN

Blackrock 2037 Municipal Target Term Trust

Return for Risk

BMN vs. MMIBX — Risk / Return Rank

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

BMN

BMN Risk / Return Rank: 28
BMN Sharpe Ratio Rank: 25
BMN Sortino Ratio Rank: 27
BMN Omega Ratio Rank: 20
BMN Calmar Ratio Rank: 42
BMN Martin Ratio Rank: 25

MMIBX

MMIBX Risk / Return Rank: 18
MMIBX Sharpe Ratio Rank: 17
MMIBX Sortino Ratio Rank: 14
MMIBX Omega Ratio Rank: 23
MMIBX Calmar Ratio Rank: 19
MMIBX Martin Ratio Rank: 16

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.

BMN vs. MMIBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Blackrock 2037 Municipal Target Term Trust (BMN) and MFS Municipal Income Fund (MMIBX). 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.

	BMN	MMIBX	Difference
Sharpe ratio Return per unit of total volatility	0.75	0.53	+0.22
Sortino ratio Return per unit of downside risk	1.18	0.73	+0.45
Omega ratio Gain probability vs. loss probability	1.15	1.15	0.00
Calmar ratio Return relative to maximum drawdown	1.36	0.66	+0.70
Martin ratio Return relative to average drawdown	3.59	1.94	+1.64
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BMN vs. MMIBX - Sharpe Ratio Comparison

The current BMN Sharpe Ratio is 0.75, which is higher than the MMIBX Sharpe Ratio of 0.53. The chart below compares the historical Sharpe Ratios of BMN and MMIBX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	BMN	MMIBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.75	0.53	+0.22
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	-0.02	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.33	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.55	0.81	-0.26

Correlation

The correlation between BMN and MMIBX is 0.19, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

BMN vs. MMIBX - Dividend Comparison

BMN's dividend yield for the trailing twelve months is around 4.30%, more than MMIBX's 2.95% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BMN Blackrock 2037 Municipal Target Term Trust	4.30%	4.30%	4.40%	4.74%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
MMIBX MFS Municipal Income Fund	2.95%	3.81%	2.51%	2.05%	1.42%	1.45%	1.86%	2.45%	2.68%	2.67%	2.87%	2.98%

Drawdowns

BMN vs. MMIBX - Drawdown Comparison

The maximum BMN drawdown since its inception was -13.04%, smaller than the maximum MMIBX drawdown of -17.40%. Use the drawdown chart below to compare losses from any high point for BMN and MMIBX.

Drawdown Indicators

	BMN	MMIBX	Difference
Max Drawdown Largest peak-to-trough decline	-13.04%	-17.40%	+4.36%
Max Drawdown (1Y) Largest decline over 1 year	-5.92%	-5.47%	-0.45%
Max Drawdown (5Y) Largest decline over 5 years	—	-17.19%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-17.19%	—
Current Drawdown Current decline from peak	-4.53%	-3.20%	-1.33%
Average Drawdown Average peak-to-trough decline	-2.17%	-2.81%	+0.64%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.24%	1.87%	+0.37%

Volatility

BMN vs. MMIBX - Volatility Comparison

Blackrock 2037 Municipal Target Term Trust (BMN) has a higher volatility of 5.73% compared to MFS Municipal Income Fund (MMIBX) at 1.27%. This indicates that BMN's price experiences larger fluctuations and is considered to be riskier than MMIBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BMN	MMIBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.73%	1.27%	+4.46%
Volatility (6M) Calculated over the trailing 6-month period	9.49%	1.89%	+7.60%
Volatility (1Y) Calculated over the trailing 1-year period	12.24%	5.54%	+6.70%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	10.52%	4.36%	+6.16%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	10.52%	4.32%	+6.20%