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iShares Municipal Bond Index Fund (BIDAX)
Performance
Return for Risk
Dividends
Drawdowns
Volatility

Fund Info

ISIN
US09258N3567
CUSIP
09258N356
Issuer
BlackRock
Inception Date
Dec 17, 2000
Min. Investment
$1,000
Distribution Policy
Distributing
Asset Class
Bond

Share Price Chart


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Performance

Performance Chart

The chart shows the growth of an initial investment of $10,000 in iShares Municipal Bond Index Fund, comparing it to the performance of the S&P 500 index or another benchmark. All prices have been adjusted for splits and dividends.


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S&P 500 Index

Returns By Period

iShares Municipal Bond Index Fund (BIDAX) has returned -0.75% so far this year and 3.58% over the past 12 months.


iShares Municipal Bond Index Fund

1D
0.18%
1M
-2.77%
YTD
-0.75%
6M
0.57%
1Y
3.58%
3Y*
2.68%
5Y*
0.54%
10Y*

Benchmark (S&P 500 Index)

1D
2.91%
1M
-5.09%
YTD
-4.63%
6M
-2.39%
1Y
16.33%
3Y*
16.69%
5Y*
10.18%
10Y*
12.16%
*Multi-year figures are annualized to reflect compound growth (CAGR)

Monthly Returns

Based on dividend-adjusted daily data since Nov 16, 2018, BIDAX's average daily return is +0.01%, while the average monthly return is +0.19%. At this rate, your investment would double in approximately 30.4 years.

Historically, 58% of months were positive and 42% were negative. The best month was Nov 2023 with a return of +6.6%, while the worst month was Sep 2022 at -3.8%. The longest winning streak lasted 10 consecutive months, and the longest losing streak was 5 months.

On a daily basis, BIDAX closed higher 38% of trading days. The best single day was Mar 25, 2020 with a return of +3.8%, while the worst single day was Mar 19, 2020 at -2.8%.


JanFebMarAprMayJunJulAugSepOctNovDecTotal
20260.71%1.35%-2.77%-0.75%
20250.50%1.34%-1.66%-0.49%-0.30%0.73%-0.30%0.92%2.41%1.08%0.17%0.08%4.52%
2024-0.32%-0.04%-0.14%-1.13%-0.33%1.52%0.77%0.68%1.13%-1.46%1.94%-1.13%1.44%
20232.99%-2.47%2.34%-0.45%-0.69%0.86%0.13%-1.24%-2.92%-1.53%6.55%2.42%5.74%
2022-2.78%-0.48%-2.88%-2.88%1.56%-2.15%2.42%-2.47%-3.76%-0.92%5.06%-0.16%-9.41%
20210.67%-1.75%0.59%0.92%0.42%0.26%0.65%-0.39%-0.72%-0.15%0.76%0.14%1.38%

Benchmark Metrics

iShares Municipal Bond Index Fund has an annualized alpha of 1.84%, beta of 0.03, and R² of 0.02 versus S&P 500 Index. Calculated based on daily prices since November 19, 2018.

  • This fund participated in 22.53% of S&P 500 Index downside but only 15.17% of its upside — more exposed to losses than it benefited from rallies.
  • Beta of 0.03 may look defensive, but with R² of 0.02 this fund 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 fund's risk.
  • R² of 0.02 means this fund 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
1.84%
Beta
0.03
0.02
Upside Capture
15.17%
Downside Capture
22.53%

Expense Ratio

BIDAX has an expense ratio of 0.50%, placing it in the medium range.


Return for Risk

Risk / Return Rank

BIDAX ranks 42 for risk / return — on par with similar mutual funds. You're getting a typical balance of risk and reward. Not a standout, but not a red flag either — a reasonable choice if other factors align with your goals.


BIDAX Risk / Return Rank: 4242
Overall Rank
BIDAX Sharpe Ratio Rank: 4242
Sharpe Ratio Rank
BIDAX Sortino Ratio Rank: 3535
Sortino Ratio Rank
BIDAX Omega Ratio Rank: 6666
Omega Ratio Rank
BIDAX Calmar Ratio Rank: 3535
Calmar Ratio Rank
BIDAX Martin Ratio Rank: 3030
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 Municipal Bond Index Fund (BIDAX) and compare them to a chosen benchmark (S&P 500 Index).


BIDAXBenchmarkDifference

Sharpe ratio

Return per unit of total volatility

0.90

0.90

0.00

Sortino ratio

Return per unit of downside risk

1.22

1.39

-0.17

Omega ratio

Gain probability vs. loss probability

1.26

1.21

+0.05

Calmar ratio

Return relative to maximum drawdown

0.97

1.40

-0.43

Martin ratio

Return relative to average drawdown

3.38

6.61

-3.23

Explore BIDAX risk-adjusted metrics in detail

Dive deeper into individual metrics with historical trends, benchmark comparisons, and performance across different time periods.

Dividends

Dividend History

iShares Municipal Bond Index Fund provided a 3.14% dividend yield over the last twelve months, with an annual payout of $0.34 per share. The fund has been increasing its distributions for 3 consecutive years.


0.00%1.00%2.00%3.00%4.00%$0.00$0.10$0.20$0.30$0.40$0.5020182019202020212022202320242025
Dividends
Dividend Yield
PeriodTTM20252024202320222021202020192018
Dividend$0.34$0.45$0.36$0.24$0.21$0.29$0.29$0.44$0.06

Dividend yield

3.14%4.09%3.25%2.16%1.92%2.36%2.35%3.64%0.48%

Monthly Dividends

The table displays the monthly dividend distributions for iShares Municipal Bond Index Fund. The dividends shown in the table have been adjusted to account for any splits that may have occurred.


JanFebMarAprMayJunJulAugSepOctNovDecTotal
2026$0.03$0.03$0.00$0.06
2025$0.05$0.06$0.06$0.06$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.45
2024$0.02$0.03$0.02$0.03$0.02$0.03$0.03$0.03$0.03$0.03$0.05$0.05$0.36
2023$0.02$0.03$0.02$0.00$0.02$0.02$0.02$0.02$0.02$0.00$0.03$0.03$0.24
2022$0.02$0.02$0.02$0.02$0.02$0.00$0.00$0.02$0.00$0.02$0.02$0.02$0.21
2021$0.02$0.02$0.02$0.02$0.02$0.02$0.03$0.02$0.02$0.02$0.02$0.04$0.29

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 Municipal Bond Index Fund. 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 Municipal Bond Index Fund was 14.39%, occurring on Oct 25, 2022. Recovery took 725 trading sessions.

The current iShares Municipal Bond Index Fund drawdown is 2.77%.


Depth

Start

To Bottom

Bottom

To Recover

End

Total

-14.39%Aug 6, 2021309Oct 25, 2022725Sep 17, 20251034
-11.43%Mar 10, 20209Mar 20, 202096Aug 6, 2020105
-2.95%Mar 2, 202620Mar 27, 2026
-2.18%Feb 16, 20218Feb 25, 202168Jun 3, 202176
-1.72%Sep 5, 20199Sep 17, 201974Jan 2, 202083

Volatility

Volatility Chart

The chart below shows the rolling one-month volatility.


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