iShares National Muni Bond ETF holds 6,654 positions and $45.0B in net assets as of May 31, 2026. The largest: State of California 4.5%, New York City Transitional Finance Authority Future Tax Secured 4.2%, New York State Dormitory Authority 3.7%, City of New York 2.9%, Commonwealth of Massachusetts 2.2%.

What is the expense ratio of MUB?

MUB costs 0.05% a year, from its prospectus.

MUBiShares National Muni Bond ETF

ETF · iSHARES TRUST

$104.98close Nov 9, 2026

The fund

Holdings as of May 31, 2026, filed with the SEC.

$45.0B

net assets, all share classes

0.05%

yearly cost, from the prospectus

6,654

positions on file

Growth of $100

Total return with dividends reinvested, month by month since September 2019.

$100$110

20192026

+6.3%

last 12 months

+3.4%

a year, over 3 years

+0.9%

a year, over 5 years

Largest holdings

The top 10 issuers of 6,654 positions, by share of the fund.

State of CaliforniaBonds: 4.5%
New York City Transitional Finance Authority Future Tax SecuredCash and short-term: 4.2%
New York State Dormitory AuthorityBonds: 3.7%
City of New YorkBonds: 2.9%
Commonwealth of MassachusettsBonds: 2.2%
New Jersey Transportation Trust Fund AuthorityBonds: 2.0%
New York City Municipal Water Finance AuthorityBonds: 2.0%
State of WashingtonBonds: 1.8%
University of CaliforniaBonds: 1.6%
Triborough Bridge & Tunnel AuthorityCash and short-term: 1.6%

Countries

Where the holdings are, by share of the fund.

United States99.5%

What it holds

By kind of asset.

Bonds95.6%
Cash and short-term4.0%

From the fund’s Form N-PORT for May 2026 (filed Jul 24, 2026) and its prospectus, via the SEC’s public data sets. Shares of net assets can sum above 100% where a fund holds cash collateral or derivatives.