iShares National Muni Bond ETF

iShares National Muni Bond ETF

About

iShares National Muni Bond ETF (US4642884146) is a US-listed bond ETF tracking the ICE AMT-Free US National Municipal Index. With a expense ratio of 0.05%, it ranks among the lowest-cost options in its category, paying distributions. The fund holds 6,781 positions with 45.4B in assets.

Score Breakdown

Scores are scaled 1–10 on a logarithmic curve relative to all ETFs in the database. Last updated: Jun 22, 2026
Component Score Details
Cost (30%) 9.3 Tracking Difference: 9.0 · TD Consistency: — · Expense Ratio: 10.0
Liquidity (25%) 10.0 Assets Under Management

Data sources: provider factsheets, exchange data, and NAV history. Information for educational purposes only — not investment advice.

Ticker MUB
ISIN
Fund Size $45.4B
Issuer iShares
Distribution Pays Distributions
Replication Physical
Inception Sep 2007
Base Currency USD
Index ICE AMT-Free US National Municipal Index
Asset Class Bonds

Costs

9.3
This fund has low total costs, with competitive tracking and expense ratios.

Cost Metrics Explained

What expense ratio, tracking difference, and TD consistency measure

Expense ratio (Total Expense Ratio) is the annual fee the fund charges, deducted from assets. It’s the headline cost, but not the full picture.

Tracking Difference measures how much the fund actually lags (or leads) its benchmark index per year. This is the single best measure of true cost — it captures the expense ratio plus all other drags like sampling error and tax withholding. A lower (or negative) value is better.

TD Consistency measures how stable the tracking difference is from year to year. A low value means predictable, reliable costs; a high value means costs can vary significantly.
Expense Ratio0.00%
 
Metric Value
Expense Ratio 0.05%

Cumulative Returns

Performance across different time periods.
Year to Date+0.00%
1 Year+0.00%
3 Years+0.00%
5 Years+0.00%
Inception+0.00%
 
Period Cumulative Return
1 Month —
3 Months —
6 Months —
1 Year +6.33%
3 Years +3.39%
5 Years +0.90%
10 Years +2.00%
YTD +1.20%
Since Inception +3.17%

Holdings

This fund invests into 6,781 individual investments.
#1
BLACKROCK LIQ MUNICASH CL INS MMF
0.75%
#2
UNIVERSITY TEX UNIV REVS
0.19%
#3
NEW YORK ST TWY AUTH ST PERS I
0.15%
#4
SAN ANTONIO TEX WTR REV
0.14%
#5
NEW YORK ST DORM AUTH ST PERS
0.14%
#6
TRIBOROUGH BRDG & TUNL AUTH N
0.13%
#7
NEW YORK N Y CITY TRANSITIONAL
0.13%
#8
NORTHWEST TEX INDPT SCH DIST
0.13%
#9
HOUSTON TEX HIGHER ED FIN CORP
0.13%
#10
OHIO ST UNIV GEN RCPTS
0.13%
View all holdings (50)
# Holding Ticker Weight
1 BLACKROCK LIQ MUNICASH CL INS MMF — 74.77%
2 UNIVERSITY TEX UNIV REVS — 19.39%
3 NEW YORK ST TWY AUTH ST PERS I — 15.30%
4 SAN ANTONIO TEX WTR REV — 14.10%
5 NEW YORK ST DORM AUTH ST PERS — 13.53%
6 TRIBOROUGH BRDG & TUNL AUTH N — 13.43%
7 NEW YORK N Y CITY TRANSITIONAL — 13.09%
8 NORTHWEST TEX INDPT SCH DIST — 13.03%
9 HOUSTON TEX HIGHER ED FIN CORP — 12.78%
10 OHIO ST UNIV GEN RCPTS — 12.75%
11 CALIFORNIA ST — 12.50%
12 NEW JERSEY ST — 12.45%
13 WASHINGTON ST — 12.43%
14 PENNSYLVANIA ST TPK COMMN TPK — 11.61%
15 CHICAGO ILL TRAN AUTH SALES TA — 11.42%
16 EAST CNTY ADVANCED WTR PURIFIC — 11.19%
17 WASHOE CNTY NEV SCH DIST — 11.12%
18 NEW JERSEY ST EDL FACS AUTH RE — 11.09%
19 ORLANDO FLA UTILS COMMN UTIL S — 11.02%
20 LONG IS PWR AUTH N Y ELEC SYS — 11.02%
21 ILLINOIS ST — 10.82%
22 MASSACHUSETTS ST — 10.74%
23 CALIFORNIA ST — 10.67%
24 MASSACHUSETTS ST — 10.33%
25 DISTRICT COLUMBIA UNIV REV — 10.27%
26 NEW YORK N Y CITY MUN WTR FIN — 10.21%
27 CHICAGO ILL — 10.13%
28 NEW YORK N Y — 10.10%
29 SAN DIEGO CALIF UNI SCH DIST — 9.92%
30 COLORADO SPRINGS COLO UTILS RE — 9.71%
31 SEATTLE WASH MUN LT & PWR REV — 9.56%
32 LOS ANGELES CALIF UNI SCH DIST — 9.27%
33 TRIBOROUGH BRDG & TUNL AUTH N — 9.19%
34 PENNSYLVANIA ST — 8.99%
35 NEW JERSEY ST TRANSN TR FD AUTH — 8.93%
36 UNIVERSITY CALIF REVS — 8.93%
37 NEW YORK ST URBAN DEV CORP REV — 8.92%
38 NEW YORK N Y CITY MUN WTR FIN — 8.89%
39 CALIFORNIA EDL FACS AUTH REV — 8.87%
40 NEW YORK ST TWY AUTH ST PERS I — 8.86%
41 TRIBOROUGH BRDG & TUNL AUTH N — 8.85%
42 OHIO ST WTR DEV AUTH WTR POLLU — 8.83%
43 NEW YORK ST TWY AUTH ST PERS I — 8.70%
44 NEW JERSEY ST EDL FACS AUTH RE — 8.69%
45 HOUSTON TEX UTIL SYS REV — 8.68%
46 PENNSYLVANIA ST TPK COMMN TPK — 8.65%
47 MARYLAND ST — 8.64%
48 METROPOLITAN GOVT NASHVILLE & — 8.63%
49 NEW YORK ST TWY AUTH ST PERS I — 8.51%
50 MASSACHUSETTS BAY TRANSN AUTH — 8.48%

Sectors

Allocation by industry sector.
 
Sector Weight
Unknown 10000.00%

Regions

Geographic allocation by country of risk.
 
Country Weight
UNKNOWN 10000.00%
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