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ISIN
US4642884146
CUSIP
464288414
Issuer
iShares
Inception Date
Sep 7, 2007
Region
North America (U.S.)
Leveraged
1x (No leverage)
Index Tracked
S&P National AMT-Free Municipal Bond Index
Domicile
United States
Distribution Policy
Distributing
Asset Class
Bond
Assets Under Management
$45B

Share Price Chart


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Performance

MUB Performance Chart

iShares National AMT-Free Muni Bond ETF (MUB) is up 1.5% since the beginning of the year. MUB is currently trading at $107 per share. Investors who bought $1,000 worth of MUB shares 5 years ago would now be looking at an investment worth $1,049.


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S&P 500 Index

Returns By Period

iShares National AMT-Free Muni Bond ETF (MUB) has returned 1.53% so far this year and 6.58% over the past 12 months. Over the last ten years, MUB has returned 1.90% per year, falling short of the S&P 500 Index benchmark, which averaged 13.88% annually.


iShares National AMT-Free Muni Bond ETF

1D
-0.01%
1M
1.35%
YTD
1.53%
6M
1.89%
1Y
6.58%
3Y*
3.21%
5Y*
0.96%
10Y*
1.90%

Benchmark (S&P 500 Index)

1D
-0.37%
1M
-0.01%
YTD
9.16%
6M
8.64%
1Y
25.22%
3Y*
19.78%
5Y*
11.99%
10Y*
13.88%
*Multi-year figures are annualized to reflect compound growth (CAGR)

MUB Monthly Returns History

Based on dividend-adjusted daily data since Sep 10, 2007, MUB's average daily return is +0.01%, while the average monthly return is +0.27%. At this rate, an investment would double in approximately 21.4 years.

Historically, 62% of months were positive and 38% were negative. The best month was Nov 2023 with a return of +5.7%, while the worst month was Feb 2008 at -4.6%. The longest winning streak lasted 10 consecutive months, and the longest losing streak was 5 months.

On a daily basis, MUB closed higher 54% of trading days. The best single day was Mar 25, 2020 with a return of +4.4%, while the worst single day was Mar 18, 2020 at -6.2%.


JanFebMarAprMayJunJulAugSepOctNovDecTotal
20260.69%1.25%-2.28%1.19%0.31%0.40%1.53%
2025-0.01%1.33%-1.82%-0.41%-0.57%0.87%-0.32%0.84%2.22%1.20%0.21%0.24%3.78%
20240.05%-0.21%-0.09%-0.94%-0.31%1.03%1.31%0.24%1.14%-1.22%1.67%-1.34%1.26%
20232.46%-2.27%2.41%-0.21%-0.64%0.56%0.03%-0.78%-2.55%-1.25%5.71%2.26%5.56%
2022-2.41%-0.53%-2.58%-2.52%1.46%-1.46%2.26%-2.44%-2.81%-0.85%4.84%-0.26%-7.34%
20210.34%-1.56%0.57%0.76%0.35%0.35%0.46%-0.19%-0.70%-0.05%0.73%-0.01%1.02%

Benchmark Metrics

iShares National AMT-Free Muni Bond ETF has an annualized alpha of 2.96%, beta of 0.04, and R2 of 0.02 versus S&P 500 Index. Calculated based on daily prices since September 10, 2007.

  • This ETF participates in less of S&P 500 Index's moves in both directions, but captures a larger share of gains (13.43%) than losses (7.27%) - typical of diversified or defensive assets.
  • Beta of 0.04 may look defensive, but with R2 of 0.02 this ETF is largely uncorrelated with S&P 500 Index - low beta reflects independence, not downside protection. See the Volatility section for a true picture of this ETF's risk.
  • R2 of 0.02 means this ETF moves largely independently of S&P 500 Index - capture ratios reflect limited market correlation rather than active downside protection. Consider using a more representative benchmark.

Alpha
2.96%
Beta
0.04
0.02
Upside Capture
13.43%
Downside Capture
7.27%

Expense Ratio

MUB has an expense ratio of 0.07%, which is considered low.


Return for Risk

Risk / Return Rank

MUB ranks 67 for risk / return — better than 67% of ETFs on our site. You're getting solid returns for the risk taken. A good sign, especially for investors who want growth without excessive volatility.


MUB Risk / Return Rank: 6767
Overall Rank
MUB Sharpe Ratio Rank: 7474
Sharpe Ratio Rank
MUB Sortino Ratio Rank: 7979
Sortino Ratio Rank
MUB Omega Ratio Rank: 8383
Omega Ratio Rank
MUB Calmar Ratio Rank: 4949
Calmar Ratio Rank
MUB Martin Ratio Rank: 5050
Martin Ratio Rank
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.

Return / Risk — by metrics

The table below present risk-adjusted performance metrics for iShares National AMT-Free Muni Bond ETF (MUB) and compare them to S&P 500 Index.

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.


MUBBenchmarkDifference
Sharpe ratioReturn per unit of total volatility

+0.26

Sortino ratioReturn per unit of downside risk

+0.58

Omega ratioGain probability vs. loss probability

1.48

1.37

+0.11

Calmar ratioReturn relative to maximum drawdown

2.37

2.78

-0.41

Martin ratioReturn relative to average drawdown

8.25

12.44

-4.19

Dividends

Dividend History

iShares National AMT-Free Muni Bond ETF provided a 3.17% dividend yield over the last twelve months, with an annual payout of $3.40 per share. The fund has been increasing its distributions for 4 consecutive years.


1.80%2.00%2.20%2.40%2.60%2.80%3.00%3.20%$0.00$0.50$1.00$1.50$2.00$2.50$3.00$3.5020152016201720182019202020212022202320242025
Dividends
Dividend Yield
PeriodTTM20252024202320222021202020192018201720162015
Dividend$3.40$3.36$3.21$2.87$2.23$2.10$2.47$2.76$2.68$2.50$2.39$2.77

Dividend yield

3.17%3.14%3.01%2.65%2.11%1.81%2.11%2.42%2.46%2.26%2.21%2.51%

Monthly Dividends

The table displays the monthly dividend distributions for iShares National AMT-Free Muni Bond ETF. The dividends shown in the table have been adjusted to account for any splits that may have occurred.


JanFebMarAprMayJunJulAugSepOctNovDecTotal
2026$0.00$0.28$0.29$0.28$0.29$0.28$1.42
2025$0.00$0.27$0.28$0.28$0.28$0.28$0.28$0.28$0.28$0.29$0.28$0.57$3.36
2024$0.00$0.26$0.27$0.26$0.26$0.28$0.26$0.26$0.27$0.28$0.27$0.54$3.21
2023$0.00$0.22$0.24$0.23$0.23$0.23$0.24$0.24$0.23$0.24$0.25$0.51$2.87
2022$0.00$0.16$0.17$0.17$0.17$0.16$0.19$0.19$0.20$0.20$0.20$0.42$2.23
2021$0.00$0.18$0.20$0.18$0.18$0.18$0.18$0.17$0.17$0.17$0.16$0.33$2.10

Drawdowns

Drawdowns Chart

The Drawdowns chart displays portfolio losses from any high point along the way. Drawdowns are calculated considering price movements and all distributions paid, if any.


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Worst Drawdowns

The table below displays the maximum drawdowns of the iShares National AMT-Free Muni Bond ETF. A maximum drawdown is a measure of risk, indicating the largest reduction in portfolio value due to a series of losing trades.

The maximum drawdown for the iShares National AMT-Free Muni Bond ETF was 13.68%, occurring on Mar 19, 2020. Recovery took 92 trading sessions.

The current iShares National AMT-Free Muni Bond ETF drawdown is 0.41%.


Related event

Drawdown

Fall

Recovery

Underwater

COVID crash2020
-13.68%Mar 2020
9d4mo 13d
4mo 22dMar 2020 - Jul 2020
Financial crisis2007–2009
-12.33%Oct 2008
1mo 5d2mo 25d
4moSep 2008 - Jan 2009
Bear market2022
-11.88%Oct 2022
1y 3mo2y 1mo
3y 4moJul 2021 - Dec 2024
2013 pullback2013
-9.74%Jun 2013
6mo 23d1y 27d
1y 7moDec 2012 - Jul 2014
2011 pullback2011
-8.86%Jan 2011
4mo 21d6mo
10mo 21dAug 2010 - Jul 2011

Drawdown Indicators


MUBBenchmarkDifference

Max Drawdown

Largest peak-to-trough decline

-13.68%

-56.78%

+43.10%

Max Drawdown (1Y)

Largest decline over 1 year

-2.79%

-9.10%

+6.31%

Max Drawdown (3Y)

Largest decline over 3 years

-5.34%

-18.90%

+13.56%

Max Drawdown (5Y)

Largest decline over 5 years

-11.88%

-25.43%

+13.55%

Max Drawdown (10Y)

Largest decline over 10 years

-13.68%

-33.92%

+20.24%

Current Drawdown

Current decline from peak

-0.41%

-1.80%

+1.39%

Average Drawdown

Average peak-to-trough decline

-2.23%

-10.71%

+8.48%

Ulcer Index

Depth and duration of drawdowns from previous peaks

0.80%

2.03%

-1.23%

Volatility

Volatility Chart

The chart below shows the rolling one-month volatility.


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Portfolio Analyzer

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