What Is the MUB ETF? A Complete Guide to Returns, Fees, Holdings, and Alternative ETFs
The iShares National Muni Bond ETF (MUB) is a core bond holding whose strengths are federally tax-exempt interest income and monthly distributions. The fee gap versus funds such as VTEB, which track the same tax-exempt municipal bonds, and interest rate sensitivity are the key selection criteria, so reviewing the outlook is important.
SubscribeWhat Is the iShares National Muni Bond ETF?
It is a core bond ETF that tracks investment-grade, tax-exempt municipal bonds issued by state and local governments across the United States. It tracks the ICE AMT-Free US National Municipal Index one-to-one and provides diversified exposure to a broad range of municipal bonds.
It suits long-term investors who want federally tax-exempt interest income along with stable bond diversification.
It is a passively managed (index-tracking) ETF run by BlackRock (iShares).
How Does the iShares National Muni Bond ETF Invest?
| Item | Details |
|---|---|
| Tracked Index | ICE AMT-Free US National Municipal Index |
| Management Style | Passive (index tracking) |
| Rebalancing Frequency | Monthly |
| Distribution Frequency | Monthly |
| Issuer | BlackRock (iShares) |
| Total Expense Ratio | 0.05% |
The fund holds investment-grade, tax-exempt municipal bonds issued by US states and local governments in index weights, tracking the performance of the nationwide municipal bond market. Its core strategy is to lower the risk of any single issuer by diversifying across a broad set of holdings while pursuing federally tax-exempt interest income.
- Broad nationwide diversification
- Low fees
iShares National Muni Bond ETF Size and Costs (AUM and Expense Ratio)
Assets under management (AUM) stand at $54.3B, and the total expense ratio is 0.05% per year.
The fee gap versus VTEB, which is in the same tax-exempt municipal bond category, is small, so liquidity and preference for the fund provider become the selection criteria.
iShares National Muni Bond ETF Performance and Trends
1-Year Price Performance
Dividend & Yield
52-Week Price RangeMunicipal bond ETFs are sensitive to the direction of interest rates. Bond prices tend to strengthen when rates fall and weaken when rates rise. Recent trends show volatility depending on the rate environment and changes in credit spreads.
Fund flows have been fairly steady thanks to demand for tax-exempt income, though flows across the municipal bond category shift with changes in the tax environment and the interest rate outlook. Demand for core bond holdings underpins inflows.
iShares National Muni Bond ETF Pros and Cons
Tax-exempt income and broad diversification are its strengths, while interest rate sensitivity and dependence on the tax environment are its weaknesses.
💪 Key Strengths
⚠️ Points to Watch
iShares National Muni Bond ETF Alternative ETFs and Related Products
Direct substitutes such as VTEB, shown in the table, track the same tax-exempt municipal bonds, so the fee gap is the key comparison point, while funds like JMUB and CGMU use active management and take a different approach. In addition, short-term municipal bond ETFs such as SUB and SHM reduce duration to lower interest rate sensitivity, and ETFs like TFI, another alternative with broad exposure to nationwide tax-exempt municipal bonds, can also be considered.
Peer Comparison ETFs| Ticker | Name | Price | Change | AUM | Total Expense Ratio | Dividend Yield | 1Y |
|---|---|---|---|---|---|---|---|
 VTEB | Vanguard Tax-Exempt Bond ETF | $48.88 | +0.4% | $53.0B | 0.03% | 3.48% | -3.2% |
 JMUB | JPMorgan Municipal ETF | $49.09 | +0.3% | $9.0B | 0.18% | 3.49% | -3.0% |
 CGMU | Capital Group Municipal Income ETF | $26.72 | +0.0% | $7.5B | 0.27% | 3.42% | -2.7% |
 CMF | iShares California Muni Bond ETF | $55.80 | +0.3% | $5.4B | 0.08% | 3.02% | -3.0% |
 HYD | VanEck High Yield Muni ETF | $49.64 | +0.3% | $4.6B | 0.32% | 4.47% | -2.9% |
Top Holdings| Ticker | Name | Weight | Price | Change | Market Cap | P/E | Dividend Yield |
|---|---|---|---|---|---|---|---|
 NYT | New York Times Co | 0.01% | $70.17 | +1.1% | $11.3B | 29.3 | 1.28% |
 NJR | New Jersey Resources Corp | 0.00% | $53.21 | +0.2% | $5.4B | 14.7 | 3.63% |
iShares National Muni Bond ETF Investor Checkpoints
Here are the points to review before investing in MUB. It is a core bond holding that pursues tax-exempt income, but interest rate sensitivity, issuer credit, and the tax environment based on the investor's tax bracket are items that need to be confirmed before buying.
| Checkpoint | What to Check | Current Status |
|---|---|---|
| 💵 Expense Ratio | Check the cumulative impact over a long holding period | Low |
| 📉 Interest Rate Sensitivity | Check duration and the interest rate outlook | Needs review |
| 🏛️ Credit Rating | Check the share of investment-grade bonds | Mostly investment grade |
| 💱 Exchange Rate | Impact on returns converted to won | Not currency hedged |
Rising interest rates and deteriorating local government finances are the main drivers of short-term volatility. The effective value of the tax exemption can vary with the investor's tax bracket, so it should be confirmed in advance.
It is a standard choice as a long-term bond core holding that pursues tax-exempt income. If you weigh fees and liquidity together, a comparison with VTEB is recommended, and to lower interest rate sensitivity, a comparison with short-term municipal bond ETFs such as SUB and SHM is recommended.
SubscribeDisclaimer: This content is for informational purposes only and does not constitute investment advice. All investment responsibility lies with the investor.
This article reflects information as of June 21, 2026.
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