MUB — iShares National Muni Bond ETF
Data updated: 2026-07-24
MUB — iShares National Muni Bond ETF data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Municipal - National Bond · $44.95B AUM · 0.05% expense ratio · 6.3% 1-yr return. From SEC regulatory filings.
MUB Fund Overview
MUB — iShares National Muni Bond ETF is a US ETF managed by iSHARES TRUST, categorised as Long Municipal - National Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US ETF
- Manager: iSHARES TRUST
- Category: Long Municipal - National Bond
- Assets under management: $44.95B
- 1-year return: 6.3%
- Ticker: MUB
- SEC CIK: 0001100663
- SEC series ID: S000018861
- Share class ID: C000052220
MUB Holdings
Top 10 holdings of iShares National Muni Bond ETF by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| BlackRock Liquidity Funds | 1.28% |
| Board of Regents of the University of Texas System | 0.19% |
| New York State Thruway Authority | 0.15% |
| San Antonio Water System | 0.14% |
| Triborough Bridge & Tunnel Authority | 0.14% |
| New York City Transitional Finance Authority Future Tax Secured | 0.13% |
| New York State Dormitory Authority | 0.13% |
| Ohio State University (The) | 0.13% |
| Houston Higher Education Finance Corp. | 0.13% |
| Northwest Independent School District | 0.13% |
MUB Portfolio Allocation
Asset-class allocation of iShares National Muni Bond ETF by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 95.6% |
| Cash & Equivalents | 4.0% |
MUB Performance
Total returns for MUB (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.2% |
| 1 year | 6.3% |
| 3 years (annualised) | 3.4% |
| 5 years (annualised) | 0.9% |
MUB Risk Information
Risk metrics for MUB, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.7%
MUB Costs and Fees
MUB costs about $5 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.05%
- Gross expense ratio: 0.05%
- Portfolio turnover: 11%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
MUB Cashflows
Over the 12 months to 2026-02, iShares National Muni Bond ETF had net inflows of $1.76B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | $303.78M |
| 2026-01 | $656.89M |
| 2025-12 | $96.35M |
| 2025-11 | $525.88M |
| 2025-10 | $1.34B |
| 2025-09 | $6.58M |
MUB Debt Constituents
Largest debt holdings of iShares National Muni Bond ETF by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Board of Regents of the University of Texas System | 0.19% |
| New York State Thruway Authority | 0.15% |
| New York State Dormitory Authority | 0.13% |
| Ohio State University (The) | 0.13% |
| Houston Higher Education Finance Corp. | 0.13% |
| Northwest Independent School District | 0.13% |
| State of New Jersey | 0.13% |
| State of California | 0.12% |
| State of Washington | 0.12% |
| Chicago Transit Authority Sales Tax Receipts Fund | 0.11% |
MUB Prospectus and SEC Filings
Official iShares National Muni Bond ETF filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long Municipal - National Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.