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#
501–600 of 781Weightsthe May 31, 2026 filing rolled forward on price — an estimate (as of market close, May 31, 2026)
| # | Issuer | Weight |
|---|---|---|
| 501 | North Orange County Community College District | 0.02% |
| 502 | City of Baltimore | 0.02% |
| 503 | Wyandotte County-Kansas City Unified Government Utility System | 0.02% |
| 504 | Maine Municipal Bond Bank | 0.02% |
| 505 | Board of Water Commissioners City & County of Denver (The) | 0.02% |
| 506 | Maricopa County High School District No. 214 Tolleson Union High School | 0.02% |
| 507 | City of Corpus Christi Utility System | 0.02% |
| 508 | City of Santa Rosa | 0.02% |
| 509 | Duval County Public Schools | 0.02% |
| 510 | Hayward Area Recreation & Park District | 0.02% |
| 511 | City of Chattanooga | 0.02% |
| 512 | Eastern Municipal Water District Financing Authority | 0.02% |
| 513 | City of Gainesville Utilities System | 0.02% |
| 514 | West Virginia Parkways Authority | 0.02% |
| 515 | Frenship Independent School District | 0.02% |
| 516 | County of Miami-Dade Transit System | 0.02% |
| 517 | City of Irvine | 0.02% |
| 518 | Gilbert Water Resource Municipal Property Corp. | 0.02% |
| 519 | San Jose Evergreen Community College District | 0.02% |
| 520 | Salem-Keizer School District No. 24J | 0.02% |
| 521 | Canutillo Independent School District | 0.02% |
| 522 | Corona-Norco Unified School District | 0.02% |
| 523 | New Orleans Aviation Board | 0.02% |
| 524 | Town of Brookline | 0.02% |
| 525 | Simi Valley Unified School District | 0.02% |
| 526 | City of El Paso TX Water & Sewer Revenue | 0.02% |
| 527 | City & County of San Francisco | 0.02% |
| 528 | Irving Independent School District | 0.02% |
| 529 | San Mateo Union High School District | 0.02% |
| 530 | City of Georgetown | 0.02% |
| 531 | Desert Community College District | 0.02% |
| 532 | University of Virginia | 0.02% |
| 533 | Melissa Independent School District | 0.02% |
| 534 | Miami University | 0.02% |
| 535 | City of Kansas City | 0.02% |
| 536 | Colorado Bridge & Tunnel Enterprise | 0.02% |
| 537 | Grossmont-Cuyamaca Community College District | 0.02% |
| 538 | City of Pflugerville | 0.02% |
| 539 | City of Tacoma Electric System | 0.02% |
| 540 | County of Sacramento Airport System | 0.02% |
| 541 | County of Franklin | 0.02% |
| 542 | Elk Grove Unified School District | 0.02% |
| 543 | Grayson County Junior College District | 0.02% |
| 544 | Pennsylvania Economic Development Financing Authority | 0.02% |
| 545 | East Baton Rouge Sewerage Commission | 0.02% |
| 546 | Richardson Independent School District | 0.02% |
| 547 | Alameda County Transportation Commission | 0.02% |
| 548 | Morgan Hill Unified School District | 0.02% |
| 549 | Chambers County Justice Center Public Facilities Corp. | 0.02% |
| 550 | University of Oregon | 0.02% |
| 551 | Arapahoe County School District No. 5 Cherry Creek | 0.02% |
| 552 | City of St. Louis | 0.02% |
| 553 | Upper Merion Area School District | 0.02% |
| 554 | Douglas County School District | 0.02% |
| 555 | City of Riverside | 0.02% |
| 556 | San Joaquin Hills Transportation Corridor Agency | 0.02% |
| 557 | Spring Independent School District | 0.02% |
| 558 | Antelope Valley Community College District | 0.02% |
| 559 | City of Manchester Sewer | 0.02% |
| 560 | County of Frederick | 0.02% |
| 561 | Greenville Independent School District | 0.02% |
| 562 | State of Florida Department of Transportation Turnpike System Revenue | 0.02% |
| 563 | Sacramento Transportation Authority Sales Tax | 0.02% |
| 564 | Santa Clarita Community College District | 0.02% |
| 565 | City of Raleigh | 0.02% |
| 566 | Douglas County School District No. Re-1 Douglas & Elbert Counties | 0.01% |
| 567 | Central Puget Sound Regional Transit Authority | 0.01% |
| 568 | North Carolina Municipal Power Agency No. 1 | 0.01% |
| 569 | City of Austin TX Water & Wastewater System Revenue | 0.01% |
| 570 | San Antonio Public Facilities Corp. | 0.01% |
| 571 | San Mateo Foster City School District | 0.01% |
| 572 | Downey Unified School District | 0.01% |
| 573 | County of Chester | 0.01% |
| 574 | Sonoma County Junior College District | 0.01% |
| 575 | University of Nebraska Facilities Corp. (The) | 0.01% |
| 576 | Pierce County School District No. 3 Puyallup | 0.01% |
| 577 | Clackamas County School District No. 7J Lake Oswego | 0.01% |
| 578 | Northampton County General Purpose Authority | 0.01% |
| 579 | Antelope Valley-East Kern Water Agency Financing Authority | 0.01% |
| 580 | Delaware River Joint Toll Bridge Commission | 0.01% |
| 581 | Metropolitan St. Louis Sewer District | 0.01% |
| 582 | Northside Independent School District | 0.01% |
| 583 | King County School District No. 414 Lake Washington | 0.01% |
| 584 | Tarrant Regional Water District Water Supply System | 0.01% |
| 585 | Columbia County School District | 0.01% |
| 586 | King County School District No. 405 Bellevue | 0.01% |
| 587 | Grant County Public Utility District No. 2 Priest Rapids Hydroelectric Project | 0.01% |
| 588 | County of Broward Water & Sewer Utility | 0.01% |
| 589 | Local Building Authority of Alpine School District | 0.01% |
| 590 | County of Fulton | 0.01% |
| 591 | State of Tennessee | 0.01% |
| 592 | Maricopa County Union High School District No. 210-Phoenix | 0.01% |
| 593 | Mt. San Antonio Community College District | 0.01% |
| 594 | City of Long Beach | 0.01% |
| 595 | City of Tampa | 0.01% |
| 596 | Virginia Port Authority Commonwealth Port Fund | 0.01% |
| 597 | City of Greensboro | 0.01% |
| 598 | Sequoia Union High School District | 0.01% |
| 599 | Philadelphia Gas Works Co. | 0.01% |
| 600 | City of Cartersville GA Water & Sewer Revenue | 0.01% |
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.