MUB is a Bond ETF from iShares holding 6603 positions as of May 31, 2026, with $45.3B in assets and a 0.05% net expense ratio. Its largest positions are Board of Regents of the University of Texas System, Series 2025B (0.2%), New York State Thruway Authority, Series 2022A (0.2%) and New York State Dormitory Authority, Series 2019D (0.1%); the top 10 holdings account for 1.3% of the portfolio. It yields 3.22% on a trailing-12-month basis.
- Issuer
- iShares
- Holdings
- 66034.0% cash, collateral & derivative positions excluded
- Net Assets
- $45.3BETF assets as of 2026-08-10
- Expense Ratio
- 0.05%per latest SEC prospectus filing
- TTM Yield
- 3.22%trailing 12-month distributions
Performance
- 1M
- -0.9%
- YTD
- +0.8%
- 1Y
- +5.1%
- 3Y (ann.)
- +3.3%
- 5Y (ann.)
- +0.7%
- 10Y (ann.)
- +1.9%
A $10,000 investment 10 years ago would be worth $12,012 today at the 10Y annualized rate. This is a backward-looking illustration, not a forecast. Project its future growth →
Total returns including dividends as of 2026-08-07. 3Y/5Y/10Y annualized. Past performance does not predict future results.
Top 25 Holdings
| # | Holding | Weight |
|---|---|---|
| 1 | Board of Regents of the University of Texas System, Series 2025B | 0.19% |
| 2 | New York State Thruway Authority, Series 2022A | 0.15% |
| 3 | New York State Dormitory Authority, Series 2019D | 0.13% |
| 4 | Ohio State University (The), Series 2026A | 0.13% |
| 5 | Houston Higher Education Finance Corp., Series 2024 | 0.13% |
| 6 | Northwest Independent School District, Series 2025 | 0.13% |
| 7 | State of New Jersey, Series 2020A | 0.13% |
| 8 | State of California | 0.12% |
| 9 | State of Washington, Series R-2022C | 0.12% |
| 10 | Chicago Transit Authority Sales Tax Receipts Fund, Series 2024A | 0.11% |
| 11 | East County Advanced Water Purification Joint Powers Authority | 0.11% |
| 12 | Washoe County School District, Series 2017C | 0.11% |
| 13 | New Jersey Educational Facilities Authority, Series A-1 | 0.11% |
| 14 | State of Illinois, Series 2017D | 0.11% |
| 15 | Commonwealth of Massachusetts, Series 2024B | 0.11% |
| 16 | State of California | 0.11% |
| 17 | Commonwealth of Massachusetts, Series 2022E | 0.10% |
| 18 | New York City Municipal Water Finance Authority, Series 2024BB, Sub-Series BB-2 | 0.10% |
| 19 | District of Columbia, Series 2025A | 0.10% |
| 20 | City of New York, Series 2026B, Sub-Series B-1 | 0.10% |
| 21 | City of Chicago, Series 2024A | 0.10% |
| 22 | San Diego Unified School District, Series 2020D-2 | 0.10% |
| 23 | City of Colorado Springs Utilities System, Series 2024A | 0.10% |
| 24 | Los Angeles Unified School District, Series 2020RYQ | 0.09% |
| 25 | Triborough Bridge & Tunnel Authority, Series 2024A | 0.09% |
Showing the top 25 of 6603 holdings. See the full MUB holdings list →
MUB alternatives
The closest Bond ETFs to MUB by portfolio overlap — the share of weight both funds hold in the same securities.
| Fund | Overlap | Expense | Assets | |
|---|---|---|---|---|
 VTEBVanguard Tax-exempt Bond Index Fund | 26% | 0.03%cheaper | $45.7B | Compare → |
 PZAInvesco National AMT-Free Municipal Bond ETF | 19% | 0.28%pricier | $4.2B | Compare → |
 CMFiShares California Muni Bond ETF | 9% | 0.08%pricier | $4.6B | Compare → |
 SUBiShares Short-Term National Muni Bond ETF | 7% | 0.07%pricier | $11.3B | Compare → |
Frequently Asked Questions
What is MUB's expense ratio?
MUB has a net expense ratio of 0.05%, per its latest SEC prospectus filing. That works out to about $5 a year on a $10,000 investment.
How many holdings does MUB have?
MUB held 6603 positions as of May 31, 2026, per its latest official holdings data. Cash, collateral and derivative positions (4.0% of portfolio weight) are excluded from that count.
What are MUB's top 10 holdings?
MUB's largest positions are Board of Regents of the University of Texas System, Series 2025B (0.2%), New York State Thruway Authority, Series 2022A (0.2%), New York State Dormitory Authority, Series 2019D (0.1%), Ohio State University (The), Series 2026A (0.1%), Houston Higher Education Finance Corp., Series 2024 (0.1%), Northwest Independent School District, Series 2025 (0.1%), State of New Jersey, Series 2020A (0.1%), State of California (0.1%), State of Washington, Series R-2022C (0.1%), Chicago Transit Authority Sales Tax Receipts Fund, Series 2024A (0.1%). Together they account for 1.3% of the portfolio.
What is MUB's dividend yield?
MUB yields 3.22% based on its trailing 12-month distributions, as of Aug 7, 2026.
How big is MUB?
MUB has $45.3B in assets as of Aug 10, 2026.
What are good alternatives to MUB?
By portfolio overlap, the closest Bond ETFs to MUB are VTEB (26% overlap), PZA (19% overlap), CMF (9% overlap). Overlap measures the share of portfolio weight both funds hold in the same securities.