MUB
iShares National Muni Bond ETFETF · Bonds$105.56−$0.31 (-0.29%)as of Aug 17, 3:55 PM ET
☾ After hours:$105.56+0.00%3:59 PM ET
MUB holdings (2026)
All 781 positions in iShares National Muni Bond ETF, ranked by portfolio weight — led by State of California at 4.5%. Positions are aggregated by issuer — all of an issuer's bonds combine into one line, weights from the fund's own SEC N-PORT filing. Not investment advice.
Weights are the May 31, 2026 SEC filing rolled forward on each holding's price move (as of market close, May 31, 2026) — an estimate of today, not the filed figure. Switch the table below to see them exactly as filed.
Holdings
781
positions in the latest filing
Largest holding
4.5%
State of California · estimated today
Top 10 weight
27%
concentration · estimated today
Filed
May 31, 2026
SEC N-PORT report date
Top 10 holdings#
IssuerWeight
1State of California
4.5%
2New York City Transitional Finance Authority Future Tax Secured
4.2%
3New York State Dormitory Authority
3.7%
4City of New York
2.9%
5Commonwealth of Massachusetts
2.2%
6New Jersey Transportation Trust Fund Authority
2.0%
7New York City Municipal Water Finance Authority
2.0%
8State of Washington
1.8%
9University of California
1.6%
10Triborough Bridge & Tunnel Authority
1.6%
MUB holdings by weight#
301–400 of 781Weightsthe May 31, 2026 filing rolled forward on price — an estimate (as of market close, May 31, 2026)
| # | Issuer | Weight |
|---|---|---|
| 301 | Long Beach Community College District | 0.06% |
| 302 | Nebraska Public Power District | 0.06% |
| 303 | South San Francisco Unified School District | 0.06% |
| 304 | Foothill-De Anza Community College District | 0.06% |
| 305 | Downtown Revitalization Public Infrastructure District | 0.06% |
| 306 | City of Philadelphia Water & Wastewater | 0.06% |
| 307 | Garland Independent School District | 0.06% |
| 308 | State of Wisconsin Environmental Improvement Fund | 0.06% |
| 309 | Hays Consolidated Independent School District | 0.05% |
| 310 | Town of Queen Creek | 0.05% |
| 311 | Board of Governors of Colorado State University System | 0.05% |
| 312 | Allegheny County Sanitary Authority | 0.05% |
| 313 | Texas Tech University System | 0.05% |
| 314 | County of Cuyahoga | 0.05% |
| 315 | Great Lakes Water Authority Sewage Disposal System | 0.05% |
| 316 | Charleston County Airport District | 0.05% |
| 317 | King County School District No. 210 Federal Way | 0.05% |
| 318 | Grand River Dam Authority | 0.05% |
| 319 | City of Jacksonville | 0.05% |
| 320 | County of Cook | 0.05% |
| 321 | Orange County Local Transportation Authority Sales Tax | 0.05% |
| 322 | State of Connecticut Clean Water Fund - State Revolving Fund | 0.05% |
| 323 | Poway Unified School District | 0.05% |
| 324 | County of Mecklenburg | 0.05% |
| 325 | San Diego County Regional Airport Authority | 0.05% |
| 326 | Horry County School District | 0.05% |
| 327 | Delaware Transportation Authority | 0.05% |
| 328 | Aldine Independent School District | 0.05% |
| 329 | Port of Seattle | 0.05% |
| 330 | Katy Independent School District | 0.05% |
| 331 | Timpanogos Special Service District | 0.05% |
| 332 | Garden State Preservation Trust | 0.05% |
| 333 | Frisco Independent School District | 0.05% |
| 334 | Newport Mesa Unified School District | 0.05% |
| 335 | City of Waco | 0.05% |
| 336 | Virginia Resources Authority Clean Water Revolving Fund | 0.05% |
| 337 | City of Memphis Light Gas & Water Division Electric System | 0.05% |
| 338 | City of Glendale | 0.05% |
| 339 | City of Greensboro Combined Water & Sewer System | 0.05% |
| 340 | South Dakota Conservancy District | 0.05% |
| 341 | New Hope Higher Education Finance Corp. | 0.05% |
| 342 | City of Indianapolis Department of Public Utilities Water System | 0.05% |
| 343 | Maine Health & Higher Educational Facilities Authority | 0.05% |
| 344 | Washington & Multnomah Counties School District No. 48J Beaverton | 0.05% |
| 345 | San Jose Unified School District | 0.05% |
| 346 | City of Alexandria | 0.05% |
| 347 | Pierce County School District No. 10 Tacoma | 0.05% |
| 348 | Augusta Water & Sewer | 0.04% |
| 349 | City of Tampa Water & Wastewater System | 0.04% |
| 350 | Richmond County Board of Education | 0.04% |
| 351 | San Diego County Regional Transportation Commission | 0.04% |
| 352 | Curators of the University of Missouri (The) | 0.04% |
| 353 | County of Harris Toll Road | 0.04% |
| 354 | County of Allegheny | 0.04% |
| 355 | Eagle Mountain & Saginaw Independent School District | 0.04% |
| 356 | City of Richmond | 0.04% |
| 357 | Sacramento City Unified School District | 0.04% |
| 358 | North Texas Municipal Water District Upper East Fork Wastewater Interceptor System | 0.04% |
| 359 | County of Santa Clara | 0.04% |
| 360 | Tampa-Hillsborough County Expressway Authority | 0.04% |
| 361 | City of Tacoma | 0.04% |
| 362 | California Municipal Finance Authority | 0.04% |
| 363 | Central Texas Regional Mobility Authority | 0.04% |
| 364 | Idaho State Building Authority | 0.04% |
| 365 | State of West Virginia | 0.04% |
| 366 | University of Utah (The) | 0.04% |
| 367 | City of Mesa Utility System | 0.04% |
| 368 | Minneapolis-St Paul Metropolitan Airports Commission | 0.04% |
| 369 | City of El Paso | 0.04% |
| 370 | East Bay Municipal Utility District Water System Revenue | 0.04% |
| 371 | County of St. Lucie | 0.04% |
| 372 | Massachusetts Port Authority | 0.04% |
| 373 | Kentucky Municipal Energy Agency | 0.04% |
| 374 | Fayette County School District | 0.04% |
| 375 | City of Los Angeles Wastewater System | 0.04% |
| 376 | San Antonio Independent School District | 0.04% |
| 377 | Miracosta Community College District | 0.04% |
| 378 | State of Connecticut Special Tax Revenue | 0.04% |
| 379 | City of San Jose | 0.04% |
| 380 | Fort Worth Independent School District | 0.04% |
| 381 | Adams & Arapahoe Counties Joint School District 28J Aurora | 0.04% |
| 382 | University of Washington | 0.04% |
| 383 | Jarrell Independent School District | 0.04% |
| 384 | County of Travis | 0.04% |
| 385 | San Juan Unified School District | 0.04% |
| 386 | Westminster School District | 0.04% |
| 387 | Medina Valley Independent School District | 0.04% |
| 388 | Arizona Water Infrastructure Finance Authority | 0.04% |
| 389 | Tri-County Regional Vocational Technical School District | 0.04% |
| 390 | Alamo Community College District | 0.04% |
| 391 | Los Angeles County Facilities 2, Inc. | 0.04% |
| 392 | Cedar Hill Independent School District | 0.04% |
| 393 | Coast Community College District | 0.04% |
| 394 | San Angelo Independent School District | 0.04% |
| 395 | Boulder Larimer & Weld Counties St Vrain Valley School District Re1J | 0.04% |
| 396 | Texas Department of Transportation State Highway Fund | 0.04% |
| 397 | San Marcos Unified School District | 0.03% |
| 398 | Rhode Island Health & Educational Building Corp | 0.03% |
| 399 | County of Pinal | 0.03% |
| 400 | South Washington County Independent School District No. 833 | 0.03% |
Methodology#
Holdings and weights are sourced from the fund's portfolio as disclosed to the SEC on Form N-PORT — a public filing. Portfolio filings are quarterly (public ~60 days after quarter end), so we anchor on the latest one and roll each weight forward daily by that holding's price move, keeping the numbers current between filings; positions in stocks ChartRow doesn't track carry their filed weight unchanged and show "—" where we have no data. Returns are total returns (dividends reinvested). One row per issuer: a bond fund holds many individual bonds from the same borrower, so we combine them — every U.S. Treasury note and bond becomes one line, as does each corporate issuer — which is how the fund's own literature presents the portfolio. Past performance does not predict future returns; not investment advice.
FAQ#
- What are the top 10 holdings of MUB?
- MUB's top 10 holdings are 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%; New Jersey Transportation Trust Fund Authority, 2.0%; New York City Municipal Water Finance Authority, 2.0%; State of Washington, 1.8%; University of California, 1.6%; Triborough Bridge & Tunnel Authority, 1.6% — together about 27% of the fund, per its May 31, 2026 SEC filing with weights rolled forward to today.
- How many holdings does MUB have?
- iShares National Muni Bond ETF (MUB) held 781 positions as of its latest SEC N-PORT filing (May 31, 2026).
- How current are MUB's holdings?
- Funds disclose their full portfolio to the SEC on Form N-PORT; the quarter-end report becomes public about 60 days later. ChartRow anchors on the latest public filing (May 31, 2026) and rolls each weight forward daily by that holding's price move, so the weights shown estimate today rather than the filing date.
- Is ChartRow affiliated with MUB or BlackRock?
- No. ChartRow is independent and is not affiliated with, sponsored by, or endorsed by BlackRock or iShares National Muni Bond ETF. Everything on this page is derived independently from the fund's public SEC filings; fund names and trademarks belong to their owners. For information only — not investment advice.