Schedule of Investments (unaudited) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
Municipal Bonds — 132.2% |
| |||||||
Alabama — 0.6% |
| |||||||
Opelika Utilities Board, Refunding RB, 4.00%, 06/01/41 | $ | 960 | $ | 1,060,723 | ||||
|
| |||||||
| Arizona — 7.6% | ||||||||
Arizona Health Facilities Authority, Refunding RB, Phoenix Children’s Hospital, Series A, 5.00%, 02/01/42 | 2,200 | 2,307,888 | ||||||
Arizona IDA, Refunding RB, Odyssey Preparatory Academy Project, Series A, 5.50%, 07/01/52(a) | 130 | 131,343 | ||||||
Arizona Industrial Development Authority, Refunding RB, Basis Schools Project, Series G, 5.00%, 07/01/47(a) | 435 | 418,600 | ||||||
County of Pinal Arizona Electric District No.3, Refunding RB: | ||||||||
4.75%, 07/01/21(b) | 680 | 713,946 | ||||||
4.75%, 07/01/31 | 3,070 | 3,204,589 | ||||||
Industrial Development Authority of the County of Pima, RB, Imagine East Mesa Charter Schools Project, 5.00%, 07/01/34(a) | 400 | 381,376 | ||||||
Salt Verde Financial Corp., RB, Senior: | ||||||||
5.00%, 12/01/32 | 1,500 | 1,886,565 | ||||||
5.00%, 12/01/37 | 2,065 | 2,661,269 | ||||||
University Medical Center Corp., Refunding RB, 6.00%, 07/01/21(b) | 900 | 954,828 | ||||||
|
| |||||||
| 12,660,404 | ||||||||
| Arkansas — 2.9% | ||||||||
Arkansas Development Finance Authority, RB, Big River Steel Project, AMT, 4.50%, 09/01/49(a) | 960 | 834,173 | ||||||
City of Benton Arkansas, RB, 4.00%, 06/01/39 | 505 | 550,450 | ||||||
City of Fort Smith Arkansas Water & Sewer Revenue, Refunding RB, 4.00%, 10/01/40 | 840 | 928,771 | ||||||
City of Little Rock Arkansas, RB, 4.00%, 07/01/41 | 1,835 | 1,952,404 | ||||||
County of Pulaski Arkansas Public Facilities Board, RB, 5.00%, 12/01/42 | 465 | 504,162 | ||||||
|
| |||||||
| 4,769,960 | ||||||||
| California — 18.5% | ||||||||
California Statewide Communities Development Authority, Refunding RB, Adventist Health System, Series A, 4.00%, 03/01/48 | 1,345 | 1,441,652 | ||||||
Carlsbad California Unified School District, GO, Election of 2006, Series B, 6.00%, 05/01/34 | 1,000 | 1,215,460 | ||||||
| Security | Par (000) | Value | ||||||
| California (continued) | ||||||||
City of San Jose California, Refunding ARB, Norman Y Mineta San Jose International Airport SJC, Series A-1, AMT, 5.75%, 03/01/34 | $ | 2,000 | $ | 2,059,340 | ||||
County of Riverside Redevelopment Successor Agency, Refunding, Tax Allocation Bonds, M/F Housing, Series A, 4.00%, 10/01/39 | 1,550 | 1,701,606 | ||||||
County of San Diego Regional Airport Authority, ARB, Subordinate, Series B, AMT, 5.00%, 07/01/47 | 1,405 | 1,598,876 | ||||||
Golden State Tobacco Securitization Corp., Refunding RB, Series A-1, 5.00%, 06/01/47 | 735 | 733,155 | ||||||
Hartnell Community College District California, GO, CAB, Election of 2002, Series D, 7.00%, 08/01/34(c) | 1,650 | 2,066,014 | ||||||
Norwalk-La Mirada Unified School District, GO, Refunding, CAB, Election of 2002, Series E (AGC), 0.00%, 08/01/38(d) | 8,000 | 4,725,520 | ||||||
Palomar Community College District, GO, CAB, Election of 2006, Series B: | ||||||||
0.00%, 08/01/30(d) | 1,500 | 1,323,465 | ||||||
0.00%, 08/01/33(d) | 4,000 | 1,712,640 | ||||||
6.20%, 08/01/39(c) | 2,605 | 3,238,275 | ||||||
San Diego Community College District, GO, CAB, Election of 2002, 6.00%, 08/01/33 | 2,800 | 3,729,460 | ||||||
State of California, GO, Refunding, Various Purpose, 5.00%, 02/01/38 | 3,000 | 3,328,080 | ||||||
State of California, GO, Various Purposes, 6.00%, 03/01/33 | 170 | 170,704 | ||||||
State of Golden Tobacco Securitization Corp., Refunding RB, Series A-2, 5.00%, 06/01/47 | 525 | 523,682 | ||||||
Visalia Unified School District, COP, (AGM), 4.00%, 05/01/48 | 1,225 | 1,243,020 | ||||||
|
| |||||||
| 30,810,949 | ||||||||
| Colorado — 0.3% | ||||||||
Colorado Educational & Cultural Facilities Authority, Refunding RB, Rocky Mountain Classical Academy Project, 5.00%, 10/01/59(a) | 595 | 553,481 | ||||||
|
| |||||||
| Connecticut — 1.0% | ||||||||
Connecticut State Health & Educational Facility Authority, Refunding RB, Lawrence & Memorial Hospital, Series F, 5.00%, 07/01/21(b) | 550 | 578,974 | ||||||
| 1 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
| Connecticut (continued) | ||||||||
State of Connecticut, GO, Series E, 5.00%, 09/15/37 | $ | 970 | $ | 1,153,815 | ||||
|
| |||||||
| 1,732,789 | ||||||||
| Delaware — 2.1% | ||||||||
County of Kent Delaware, RB, CHF-Dover, LLC-Delaware State University Project, Series A: | ||||||||
5.00%, 07/01/40 | 330 | 318,034 | ||||||
5.00%, 07/01/48 | 900 | 833,751 | ||||||
County of Sussex Delaware, RB, NRG Energy, Inc., Indian River Power LLC Project, 6.00%, 10/01/40 | 1,200 | 1,215,588 | ||||||
Delaware Transportation Authority, RB, U.S. 301 Project, 5.00%, 06/01/55 | 950 | 1,073,700 | ||||||
|
| |||||||
| 3,441,073 | ||||||||
| Florida — 3.1% | ||||||||
County of Miami-Dade Florida, RB, AMT, Seaport Department, Series B, 6.00%, 10/01/31 | 4,135 | 4,713,073 | ||||||
Stevens Plantation Community Development District, RB, Special Assessment, Series A, 7.10%, 05/01/35(e)(f)(g) | 860 | 412,800 | ||||||
|
| |||||||
| 5,125,873 | ||||||||
| Georgia — 0.7% | ||||||||
County of Georgia Housing & Finance Authority, RB, S/F Housing, Series A: | ||||||||
3.95%, 12/01/43 | 295 | 323,503 | ||||||
4.00%, 12/01/48 | 210 | 228,978 | ||||||
Main Street Natural Gas, Inc., RB, Series A: | ||||||||
5.00%, 05/15/38 | 255 | 312,023 | ||||||
5.00%, 05/15/43 | 330 | 367,633 | ||||||
|
| |||||||
| 1,232,137 | ||||||||
| Hawaii — 0.3% | ||||||||
State of Hawaii Department of Budget & Finance, Refunding RB, Special Purpose, Senior Living, Kahala Nui, 5.25%, 11/15/37 | 400 | 426,328 | ||||||
|
| |||||||
| Idaho — 0.3% | ||||||||
Idaho Health Facilities Authority, RB, St. Lukes Health System Project, Series A, 5.00%, 03/01/39 | 500 | 541,415 | ||||||
|
| |||||||
| Illinois — 9.6% | ||||||||
Chicago Board of Education, GO, Series D: | ||||||||
Dedicated Revenues, Series H, 5.00%, 12/01/36 | 235 | 235,132 | ||||||
Project, Series C, 5.25%, 12/01/35 | 775 | 782,192 | ||||||
| Security | Par (000) | Value | ||||||
| Illinois (continued) | ||||||||
Chicago Board of Education, GO, Refunding: | ||||||||
Dedicated Revenues, Series C, 5.00%, 12/01/25 | $ | 425 | $ | 441,749 | ||||
Dedicated Revenues, Series C, 5.00%, 12/01/34 | 235 | 234,803 | ||||||
Dedicated Revenues, Series F, 5.00%, 12/01/23 | 310 | 323,972 | ||||||
Series C, 5.00%, 12/01/25 | 335 | 348,202 | ||||||
Chicago Board of Education, GO: | ||||||||
5.00%, 12/01/46 | 280 | 264,695 | ||||||
5.00%, 12/01/46 | 725 | 685,371 | ||||||
City of Chicago Illinois, Refunding ARB, O’Hare International Airport Passenger Facility Charge, Series B, AMT, 4.00%, 01/01/29 | 1,600 | 1,631,600 | ||||||
City of Chicago Illinois Midway International Airport, Refunding GARB, 2nd Lien, Series A, AMT, 5.00%, 01/01/41 | 870 | 923,044 | ||||||
City of Chicago Illinois Transit Authority, RB, Sales Tax Receipts, 5.25%, 12/01/40 | 665 | 702,798 | ||||||
County of Will Illinois, GO, 5.00%, 11/15/45 | 600 | 698,028 | ||||||
Illinois Finance Authority, RB, Chicago LLC, University of Illinois at Chicago Project, Series A: | ||||||||
5.00%, 02/15/37 | 300 | 301,023 | ||||||
5.00%, 02/15/47 | 205 | 200,656 | ||||||
5.00%, 02/15/50 | 100 | 97,796 | ||||||
Illinois Finance Authority, Refunding RB, OSF Health Care System, Series A, 5.00%, 11/15/45 | 1,205 | 1,292,748 | ||||||
Metropolitan Pier & Exposition Authority, RB, McCormick Place Expansion Project Bonds, Series A, 5.00%, 06/15/57 | 285 | 274,387 | ||||||
Metropolitan Pier & Exposition Authority, Refunding RB, McCormick Place Expansion Project, 4.00%, 06/15/50 | 220 | 184,435 | ||||||
Railsplitter Tobacco Settlement Authority, RB, 6.00%, 06/01/21(b) | 1,150 | 1,215,688 | ||||||
State of Illinois, GO: | ||||||||
5.50%, 05/01/39 | 795 | 832,365 | ||||||
Series D, 5.00%, 11/01/28 | 645 | 655,075 | ||||||
State of Illinois Toll Highway Authority, RB, Series A, 5.00%, 01/01/40 | 2,980 | 3,377,532 | ||||||
| 2 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
| Illinois (continued) | ||||||||
Upper Illinois River Valley Development Authority, Refunding RB, Prairie Crossing Charter School, 5.00%, 01/01/55(a) | $ | 390 | $ | 352,954 | ||||
|
| |||||||
| 16,056,245 | ||||||||
| Iowa — 0.1% | ||||||||
Iowa Finance Authority, Refunding RB, Iowa Fertilizer Co. Project, Series B, | 250 | 242,865 | ||||||
|
| |||||||
| Kansas — 0.5% | ||||||||
County of Seward Kansas Unified School District No. 480 Liberal, GO, Refunding, 5.00%, 09/01/39 | 720 | 795,413 | ||||||
|
| |||||||
| Kentucky — 3.9% | ||||||||
County of Boyle Kentucky, Refunding RB, Centre College of Kentucky, 5.00%, 06/01/37 | 2,500 | 2,829,500 | ||||||
Kentucky Economic Development Finance Authority, RB, Catholic Health Initiatives, Series A, 5.38%, 01/01/23(b) | 1,830 | 2,068,504 | ||||||
Kentucky Public Transportation Infrastructure Authority, RB, Downtown Crossing Project, Convertible CAB, 1st Tier, Series C(c): | ||||||||
6.45%, 07/01/34 | 500 | 495,000 | ||||||
6.60%, 07/01/39 | 830 | 815,284 | ||||||
6.75%, 07/01/43 | 270 | 267,797 | ||||||
|
| |||||||
| 6,476,085 | ||||||||
| Louisiana — 1.5% | ||||||||
City of Alexandria Louisiana Utilities, RB, 5.00%, 05/01/39 | 860 | 984,218 | ||||||
Louisiana Local Government Environmental Facilities & Community Development Authority, RB, Westlake Chemical Corp. Project, Series A-1, 6.50%, 11/01/35 | 1,050 | 1,066,527 | ||||||
Louisiana Public Facilities Authority, RB, Belle Chasse Educational Foundation Project, 6.50%, 05/01/21(b) | 400 | 423,748 | ||||||
|
| |||||||
| 2,474,493 | ||||||||
| Maryland — 0.4% | ||||||||
County of Anne Arundel Maryland Consolidated, RB, Special Taxing District, Villages at Two Rivers Project: | ||||||||
5.13%, 07/01/36 | 170 | 157,627 | ||||||
5.25%, 07/01/44 | 170 | 148,444 | ||||||
| Security | Par (000) | Value | ||||||
| Maryland (continued) | ||||||||
Maryland Community Development Administration, Refunding RB, S/F Housing, Series A, 4.10%, 09/01/38 | $ | 315 | $ | 348,809 | ||||
|
| |||||||
| 654,880 | ||||||||
| Massachusetts — 3.4% | ||||||||
Massachusetts Development Finance Agency, RB: | ||||||||
Emerson College Issue, Series A, 5.00%, 01/01/47 | 630 | 679,594 | ||||||
Emerson College Issue, 5.00%, 01/01/48 | 1,115 | 1,195,704 | ||||||
Emerson College Issue, Series A, 5.25%, 01/01/42 | 565 | 609,313 | ||||||
UMass Darthmouth Student Housing Project, 5.00%, 10/01/48 | 830 | 753,997 | ||||||
Massachusetts Development Finance Agency, Refunding RB: | ||||||||
Atrius Health Issue, Series A, 4.00%, 06/01/49 | 75 | 75,071 | ||||||
Emmanuel College Issue, Series A, 5.00%, 10/01/43 | 750 | 796,050 | ||||||
International Charter School, 5.00%, 04/15/40 | 400 | 420,440 | ||||||
Western New England University, 5.00%, 09/01/43 | 750 | 807,270 | ||||||
Massachusetts HFA, RB, M/F Housing, Series A: | ||||||||
3.80%, 12/01/43 | 160 | 171,594 | ||||||
3.85%, 06/01/46 | 205 | 219,618 | ||||||
|
| |||||||
| 5,728,651 | ||||||||
| Michigan — 7.6% | ||||||||
Michigan Finance Authority, RB: | ||||||||
Beaumont Health Credit Group, Series A, 5.00%, 11/01/44 | 1,555 | 1,721,292 | ||||||
Detroit Water & Sewage Disposal System, Senior Lien, Series 2014 C-2, AMT, 5.00%, 07/01/44 | 240 | 249,948 | ||||||
Michigan Finance Authority, Refunding RB, Henry Ford Health System, 5.00%, 11/15/41 | 5,560 | 6,278,519 | ||||||
State of Michigan Hospital Finance Authority, Refunding RB: | ||||||||
Ascension Health Senior Credit Gruop, 5.00%, 11/15/47 | 215 | 267,593 | ||||||
Trinity Health Credit Group, Series C, 4.00%, 12/01/32 | 2,100 | 2,208,675 | ||||||
| 3 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
| Michigan (continued) | ||||||||
State of Michigan Housing Development Authority, RB, S/F Housing, Series A, 3.80%, 10/01/38 | $ | 1,690 | $ | 1,848,049 | ||||
|
| |||||||
| 12,574,076 | ||||||||
| Minnesota — 2.6% | ||||||||
City of Maple Grove Minnesota, Refunding RB, Maple Grove Hospital, Corp., 4.00%, 05/01/37 | 880 | 909,084 | ||||||
City of Minneapolis Minnesota, Refunding RB, Fairview Health Services, Series A, 5.00%, 11/15/49 | 560 | 630,700 | ||||||
City of Otsego Minnesota, Refunding RB, Kaleidoscope Charter School Project, Series A, 5.00%, 09/01/44 | 425 | 404,447 | ||||||
City of Spring Lake Park Michigan, RB, Academy For Higher Learning Project, 5.00%, 06/15/39 | 1,080 | 1,042,535 | ||||||
Minneapolis-St. Paul Metropolitan Airports Commission, Refunding ARB, Sub Series D, AMT, 5.00%, 01/01/41 | 290 | 332,769 | ||||||
Minnesota Higher Education Facilities Authority, RB: | ||||||||
Augsburg College, Series B, 4.25%, 05/01/40 | 660 | 573,751 | ||||||
College of St. Benedict, Series 8-K, 4.00%, 03/01/43 | 385 | 393,647 | ||||||
|
| |||||||
| 4,286,933 | ||||||||
| Mississippi — 0.8% | ||||||||
County of Warren Mississippi, RB, Gulf Opportunity Zone Bonds, International Paper Co. Project, Series A, 5.38%, 12/01/35 | 400 | 415,220 | ||||||
Mississippi Development Bank, RB, CAB, Special Obligation, Hinds Community College District (AGM), 5.00%, 04/01/21(b) | 845 | 878,039 | ||||||
|
| |||||||
| 1,293,259 | ||||||||
| Missouri — 2.5% | ||||||||
Missouri Development Finance Board, RB, Annual Appropriation Sewer System, Series B, 5.00%, 11/01/41 | 900 | 948,015 | ||||||
Missouri State Health & Educational Facilities Authority, RB: | ||||||||
A.T. Still University of Health Sciences, 5.25%, 10/01/21(b) | 500 | 533,505 | ||||||
A.T. Still University of Health Sciences, 5.00%, 10/01/23(b) | 500 | 577,840 | ||||||
Heartland Regional Medical Center, 4.13%, 02/15/43 | 300 | 304,941 | ||||||
University of Central Missouri, Series C-2, 5.00%, 10/01/34 | 1,000 | 1,104,460 | ||||||
| Security | Par (000) | Value | ||||||
| Missouri (continued) | ||||||||
Missouri State Health & Educational Facilities Authority, Refunding RB, Kansas City University of Medicine and Biosciences, Series A, 5.00%, 06/01/42 | $ | 540 | $ | 633,161 | ||||
|
| |||||||
| 4,101,922 | ||||||||
| Nebraska — 1.1% | ||||||||
Central Plains Energy Project, RB, Gas Project No. 3, 5.00%, 09/01/42 | 600 | 642,186 | ||||||
County of Douglas Nebraska Hospital Authority No. 3, Refunding RB, Health Facilities Nebraska Methodist Health System, 5.00%, 11/01/45 | 400 | 437,260 | ||||||
Nebraska Public Power District, Refunding RB, Series A: | ||||||||
5.00%, 01/01/32 | 250 | 266,960 | ||||||
4.00%, 01/01/44 | 400 | 417,848 | ||||||
|
| |||||||
| 1,764,254 | ||||||||
| Nevada — 0.9% | ||||||||
City of Las Vegas Nevada, RB, Special Assessment, No. 809 Summerlin Area, 5.65%, 06/01/23 | 420 | 431,235 | ||||||
County of Clark Nevada, Refunding ARB, Department of Aviation, Subordinate Lien, Series A-2, 4.25%, 07/01/36 | 1,000 | 1,058,340 | ||||||
|
| |||||||
| 1,489,575 | ||||||||
| New Hampshire — 0.2% | ||||||||
New Hampshire Business Finance Authority, Refunding RB, Resource Recovery, Covanta Project(a): | ||||||||
Series B, 4.63%, 11/01/42 | 255 | 245,409 | ||||||
Series C, AMT, 4.88%, 11/01/42 | 145 | 139,824 | ||||||
|
| |||||||
| 385,233 | ||||||||
| New Jersey — 13.3% | ||||||||
New Jersey Economic Development Authority, RB, School Facilities Construction Bonds, Series UU: | ||||||||
5.00%, 06/15/24(b) | 80 | 95,256 | ||||||
5.00%, 06/15/40 | 345 | 348,653 | ||||||
New Jersey EDA, RB, AMT: | ||||||||
Continental Airlines, Inc. Project, Series B, 5.63%, 11/15/30 | 660 | 633,666 | ||||||
Goethals Bridge Replacement Project (AGM), 5.13%, 07/01/42 | 200 | 214,458 | ||||||
New Jersey EDA, Refunding RB, Special Assessment, Kapkowski Road Landfill Project, 6.50%, 04/01/28 | 7,500 | 8,153,625 | ||||||
| 4 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
| New Jersey (continued) | ||||||||
New Jersey Health Care Facilities Financing Authority, Refunding RB: | ||||||||
Hospital Asset Transfer Program, 5.00%, 10/01/37 | $ | 685 | $ | 692,268 | ||||
St. Barnabas Health Care System, Series A, 4.63%, 07/01/21(b) | 510 | 534,393 | ||||||
St. Barnabas Health Care System, Series A, 5.63%, 07/01/21(b) | 1,700 | 1,799,654 | ||||||
St. Barnabas Health Care System, Series A, 5.00%, 07/01/25 | 500 | 539,015 | ||||||
New Jersey State Turnpike Authority, RB, Series E, 5.00%, 01/01/45 | 1,860 | 2,081,824 | ||||||
New Jersey Transportation Trust Fund Authority, RB: | ||||||||
Transportation Program Bonds, Series S, 5.25%, 06/15/43 | 1,070 | 1,111,751 | ||||||
CAB, Transportation System, Series A, 0.00%, 12/15/35(d) | 1,000 | 485,110 | ||||||
Transportation Program, Series AA, 5.00%, 06/15/45 | 900 | 912,114 | ||||||
Transportation Program, Series AA, 5.00%, 06/15/46 | 400 | 404,912 | ||||||
New Jersey Transportation Trust Fund Authority, Refunding RB, Transportation System, Series A, 5.00%, 12/15/36 | 140 | 143,373 | ||||||
South Jersey Port Corp., RB, Marine Terminal, Series B, AMT, 5.00%, 01/01/35 | 625 | 635,694 | ||||||
Tobacco Settlement Financing Corp., Refunding RB: | ||||||||
Series A, 5.00%, 06/01/35 | 760 | 890,781 | ||||||
Series A, 5.25%, 06/01/46 | 1,810 | 2,007,471 | ||||||
Sub-Series B, 5.00%, 06/01/46 | 490 | 511,486 | ||||||
|
| |||||||
| 22,195,504 | ||||||||
| New Mexico — 0.3% | ||||||||
New Mexico Hospital Equipment Loan Council, Refunding RB, Presbyterian Healthcare Services, 5.00%, 08/01/44 | 450 | 495,599 | ||||||
|
| |||||||
| New York — 4.3% | ||||||||
City of New York Industrial Development Agency, RB, PILOT (AMBAC), 5.00%, 01/01/39 | 925 | 925,990 | ||||||
City of New York Water & Sewer System, Refunding RB, 2nd Generation, Fiscal 2013, 5.00%, 06/15/47 | 1,000 | 1,113,990 | ||||||
Counties of New York Tobacco Trust IV, Refunding RB, Settlement Pass-Through Turbo, Series A, 6.25%, 06/01/41(a) | 900 | 900,234 | ||||||
| Security | Par (000) | Value | ||||||
| New York (continued) | ||||||||
Counties of New York Tobacco Trust VI, Refunding RB, Tobacco Settlement Pass-Through, Series A-2B, 5.00%, 06/01/45 | $ | 500 | $ | 500,010 | ||||
Erie Tobacco Asset Securitization Corp., Refunding RB, Asset-Backed, Series A, 5.00%, 06/01/45 | 1,160 | 1,135,327 | ||||||
Metropolitan Transportation Authority, Refunding RB, Series C-1: | ||||||||
Green Bond, 5.25%, 11/15/55 | 490 | 538,966 | ||||||
5.00%, 11/15/56 | 320 | 337,757 | ||||||
New York Liberty Development Corp., Refunding RB, 3 World Trade Center Project, Class 2, 5.38%, 11/15/40(a) | 405 | 382,903 | ||||||
State of New York Mortgage Agency, Refunding RB, S/F Housing, Series 211, 3.75%, 10/01/43 | 1,190 | 1,310,475 | ||||||
|
| |||||||
| 7,145,652 | ||||||||
| North Dakota — 0.3% | ||||||||
County of Burleigh North Dakota, Refunding RB, St. Alexius Medical Center Project, Series A, 5.00%, 07/01/21(b) | 480 | 501,610 | ||||||
|
| |||||||
| Ohio — 5.3% | ||||||||
Buckeye Tobacco Settlement Financing Authority, Refunding RB, Senior: | ||||||||
Class 2, Series B-2, 5.00%, 06/01/55 | 2,255 | 2,273,649 | ||||||
Series A-2, 3.00%, 06/01/48 | 1,505 | 1,373,779 | ||||||
City of Dayton Ohio Airport Revenue, Refunding ARB, James M. Cox Dayton International Airport, Series A (AGM), AMT, 4.00%, 12/01/32 | 2,000 | 2,081,660 | ||||||
Northwest Local School District/Hamilton & Butler Counties, GO, School Improvements, 4.00%, 12/01/50 | 1,135 | 1,214,427 | ||||||
Ohio Air Quality Development Authority, RB, AMG Vanadium Project, AMT, 5.00%, 07/01/49(a) | 395 | 377,284 | ||||||
State of Ohio, Refunding RB, University Hospitals Health System, Series A, 5.00%, 01/15/41 | 1,500 | 1,568,685 | ||||||
|
| |||||||
| 8,889,484 | ||||||||
| Oklahoma — 0.9% | ||||||||
City of Oklahoma Public Property Authority, Refunding RB, 5.00%, 10/01/39 | 720 | 826,560 | ||||||
| 5 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
| Oklahoma (continued) | ||||||||
Oklahoma Development Finance Authority, RB, OU Medicine Project, Series B, 5.25%, 08/15/48 | $ | 605 | $ | 651,053 | ||||
|
| |||||||
| 1,477,613 | ||||||||
| Oregon — 1.4% | ||||||||
Oregon Health & Science University, RB, Series A, 4.00%, 07/01/37 | 675 | 766,294 | ||||||
State of Oregon State Facilities Authority, Refunding RB, University of Portland Project, Series A, 5.00%, 04/01/45 | 1,475 | 1,587,940 | ||||||
|
| |||||||
| 2,354,234 | ||||||||
| Pennsylvania — 4.3% | ||||||||
Commonwealth Financing Authority, RB, Tobacco Master Settlement Payment: | ||||||||
5.00%, 06/01/33 | 335 | 399,625 | ||||||
5.00%, 06/01/34 | 750 | 888,683 | ||||||
(AGM), 4.00%, 06/01/39 | 1,365 | 1,489,611 | ||||||
County of Montgomery Higher Education & Health Authority, Refunding RB, Thomas Jefferson University: | ||||||||
Series A, 4.00%, 09/01/49 | 495 | 512,127 | ||||||
Project, 4.00%, 09/01/49 | 715 | 745,745 | ||||||
Delaware River Port Authority, RB, 4.50%, 01/01/32 | 1,500 | 1,690,335 | ||||||
Pottsville Hospital Authority, Refunding RB, Lehigh Valley Health Network, Series B, 5.00%, 07/01/45 | 1,250 | 1,383,587 | ||||||
|
| |||||||
| 7,109,713 | ||||||||
| Puerto Rico — 6.3% | ||||||||
Children’s Trust Fund, Refunding RB, Tobacco Settlement Asset-Backed Bonds: | ||||||||
5.50%, 05/15/39 | 315 | 315,775 | ||||||
5.63%, 05/15/43 | 345 | 345,831 | ||||||
Commonwealth of Puerto Rico Aqueduct & Sewer Authority, RB, Senior Lien, Series A: | ||||||||
5.00%, 07/01/33 | 1,305 | 1,275,677 | ||||||
5.13%, 07/01/37 | 375 | 371,362 | ||||||
Commonwealth of Puerto Rico Aqueduct & Sewer Authority, Refunding RB, Senior Lien, Series A: | ||||||||
6.00%, 07/01/38 | 385 | 385,142 | ||||||
6.00%, 07/01/44 | 700 | 700,105 | ||||||
Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue, RB, Restructured: | ||||||||
CAB, Series A-1, 0.00%, 07/01/46(d) | 5,318 | 1,355,452 | ||||||
| Security | Par (000) | Value | ||||||
| Puerto Rico (continued) | ||||||||
Series A-1, 4.75%, 07/01/53 | $ | 838 | $ | 809,106 | ||||
Series A-1, 5.00%, 07/01/58 | 3,553 | 3,544,402 | ||||||
Series A-2, 4.33%, 07/01/40 | 552 | 528,319 | ||||||
Series A-2, 4.78%, 07/01/58 | 896 | 863,744 | ||||||
|
| |||||||
| 10,494,915 | ||||||||
| Rhode Island — 3.4% | ||||||||
Rhode Island Health & Educational Building Corp., Refunding RB, Series A (AGM), 3.75%, 05/15/32 | 1,155 | 1,282,882 | ||||||
Rhode Island Housing & Mortgage Finance Corp., RB, (FHA), S/F Housing, Series 3-B, 4.13%, 10/01/49 | 480 | 501,264 | ||||||
Tobacco Settlement Financing Corp., Refunding RB: | ||||||||
Series A, 5.00%, 06/01/40 | 1,000 | 1,069,160 | ||||||
Series B, 4.50%, 06/01/45 | 2,730 | 2,835,951 | ||||||
|
| |||||||
| 5,689,257 | ||||||||
| South Carolina — 1.4% | ||||||||
South Carolina Jobs EDA, RB, Hilton Head Christian Academy, 5.00%, 01/01/55(a) | 470 | 381,424 | ||||||
South Carolina Jobs-Economic Development Authority, RB, Bishop Gadsden Episcopal Retirement Community: | ||||||||
5.00%, 04/01/44 | 100 | 104,269 | ||||||
4.00%, 04/01/49 | 100 | 89,694 | ||||||
5.00%, 04/01/49 | 135 | 139,702 | ||||||
4.00%, 04/01/54 | 105 | 90,425 | ||||||
5.00%, 04/01/54 | 245 | 250,130 | ||||||
State of South Carolina Public Service Authority, RB, Series E, 5.50%, 12/01/53 | 1,000 | 1,074,170 | ||||||
State of South Carolina Public Service Authority, Refunding RB, Series A, 5.00%, 12/01/36 | 175 | 192,764 | ||||||
|
| |||||||
| 2,322,578 | ||||||||
| South Dakota — 0.5% | ||||||||
City of Rapid City South Dakota, RB, 4.00%, 12/01/48 | 740 | 794,494 | ||||||
|
| |||||||
| Tennessee — 2.8% | ||||||||
Chattanooga Health Educational & Housing Facility Board, RB, Catholic Health Initiatives, Series A, 5.25%, 01/01/23(b) | 1,950 | 2,194,549 | ||||||
| 6 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
| Tennessee (continued) | ||||||||
City of Johnson Health & Educational Facilities Board, RB, Mountain States Health, Series A, 5.00%, 08/15/42 | $ | 800 | $ | 824,464 | ||||
County of Chattanooga-Hamilton Tennessee Hospital Authority, Refunding RB, Series A, 5.00%, 10/01/44 | 875 | 900,051 | ||||||
County of Nashville & Davidson Metropolitan Government Health & Educational Facilities Board, RB, Vanderbilt University Medical Center, Series A, 5.00%, 07/01/40 | 675 | 754,657 | ||||||
|
| |||||||
| 4,673,721 | ||||||||
| Texas — 9.6% | ||||||||
County of Harris Texas Houston Sports Authority, Refunding RB, CAB, Senior Lien, Series G (NPFGC), 0.00%, 11/15/41(d) | 11,690 | 4,401,285 | ||||||
County of Midland Texas Fresh Water Supply District No. 1, RB, CAB, City of Midland Project, Series A, 0.00%, 09/15/38(d) | 10,760 | 5,432,832 | ||||||
El Paso Independent School District, GO, (PSF-GTD), 4.00%, 08/15/43 | 890 | 1,036,628 | ||||||
Leander ISD, GO, Refunding CAB, Series D (PSF-GTD)(d): | ||||||||
0.00%, 08/15/24(b) | 370 | 216,010 | ||||||
0.00%, 08/15/35 | 3,630 | 2,060,932 | ||||||
Red River Texas Education Financing Corp., RB, Texas Christian University Project, 5.25%, 03/15/23(b) | 760 | 866,278 | ||||||
San Antonio Public Facilities Corp., Refunding RB, Convention Center Refinancing and Expansion Project, 4.00%, 09/15/42 | 1,355 | 1,424,904 | ||||||
Texas Private Activity Bond Surface Transportation Corp., RB, Senior Lien, LBJ Infrastructure Group LLC, 7.00%, 06/30/40 | 500 | 501,995 | ||||||
|
| |||||||
| 15,940,864 | ||||||||
| Utah — 0.9% | ||||||||
Salt Lake City Corp. Airport Revenue, ARB, Series A, AMT, 5.00%, 07/01/43 | 530 | 591,051 | ||||||
State of Utah Charter School Finance Authority, RB, Utah Charter Academies Project, 5.00%, 10/15/48 | 360 | 432,021 | ||||||
| Security | Par (000) | Value | ||||||
| Utah (continued) | ||||||||
State of Utah Charter School Finance Authority, Refunding RB, Mountainville Academy, 4.00%, 04/15/42 | $ | 400 | $ | 424,716 | ||||
|
| |||||||
| 1,447,788 | ||||||||
| Vermont — 0.5% | ||||||||
University of Vermont & State Agricultural College, Refunding RB, 4.00%, 10/01/37 | 500 | 544,675 | ||||||
Vermont Student Assistance Corp., RB, Series A, 4.13%, 06/15/30 | 350 | 364,780 | ||||||
|
| |||||||
| 909,455 | ||||||||
| Virginia — 1.8% | ||||||||
Ballston Quarter Community Development Authority, Tax Allocation Bonds, Series A, 5.38%, 03/01/36 | 490 | 449,021 | ||||||
Virginia Beach Development Authority, Refunding RB, Westminster-Canterbury on Chesapeake Bay: | ||||||||
5.00%, 09/01/44 | 585 | 619,772 | ||||||
4.00%, 09/01/48 | 375 | 356,468 | ||||||
Virginia HDA, RB, M/F Housing, Rental Housing, Series B, 4.00%, 06/01/53 | 385 | 416,709 | ||||||
Virginia Small Business Financing Authority, RB, AMT: | ||||||||
Covanta Project, 5.00%, 01/01/48(a)(h) | 470 | 447,999 | ||||||
Senior Lien, Elizabeth River Crossings OpCo LLC Project, 6.00%, 01/01/37 | 725 | 759,111 | ||||||
|
| |||||||
| 3,049,080 | ||||||||
| Washington — 0.4% | ||||||||
State of Washington Housing Finance Commission, Refunding RB, Horizon House Project, 5.00%, 01/01/38(a) | 600 | 621,852 | ||||||
|
| |||||||
| West Virginia — 0.8% | ||||||||
West Virginia Hospital Finance Authority, RB, Improvement, West Virginia University Health System Obligated Group, Series A, 4.00%, 06/01/51 | 1,305 | 1,391,861 | ||||||
|
| |||||||
| Wisconsin — 1.2% | ||||||||
Public Finance Authority, Refunding RB, National Gypsum Co., AMT, 4.00%, 08/01/35 | 280 | 241,142 | ||||||
Wisconsin Health & Educational Facilities Authority, Refunding RB, Milwaukee Regional Medical Center Thermal Service, 5.00%, 04/01/44 | 800 | 1,006,432 | ||||||
| 7 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Par (000) | Value | ||||||
| Wisconsin (continued) | ||||||||
WPPI Energy Power Supply Systems, Refunding RB, Series A, 5.00%, 07/01/37 | $ | 665 | $ | 752,587 | ||||
|
| |||||||
| 2,000,161 | ||||||||
|
| |||||||
Total Municipal Bonds — 132.2% |
| 220,184,451 | ||||||
|
| |||||||
Municipal Bonds Transferred to Tender Option Bond Trusts(i) — 34.7% |
| |||||||
| California — 1.1% | ||||||||
Los Angeles California Unified School District, GO, Election of 2008, Series B-1, 5.25%, 07/01/42(j) | 1,451 | 1,792,962 | ||||||
|
| |||||||
| Colorado — 1.3% | ||||||||
State of Colorado Health Facilities Authority, Refunding RB, Commonspirit Health, Series A, 5.00%, 08/01/44(j) | 1,950 | 2,174,581 | ||||||
|
| |||||||
| Connecticut — 1.8% | ||||||||
State of Connecticut Health & Educational Facility Authority, Refunding RB, Trinity Health Credit Group, 5.00%, 12/01/45 | 2,611 | 2,935,261 | ||||||
|
| |||||||
| Michigan — 3.7% | ||||||||
State of Michigan Housing Development Authority, RB, S/F Housing, Series C, 3.90%, 12/01/33 | 5,385 | 6,074,603 | ||||||
|
| |||||||
| New Jersey — 0.8% | ||||||||
New Jersey Transportation Trust Fund Authority, RB, Transportation System, Series B, 5.25%, 06/15/36 | 1,400 | 1,409,187 | ||||||
|
| |||||||
| New York — 13.1% | ||||||||
City of New York, GO, Refunding, Fiscal 2015, Series B, 4.00%, 08/01/32 | 3,990 | 4,349,140 | ||||||
City of New York Water & Sewer System, Refunding RB, 2nd General Resolution, Fiscal 2013: | ||||||||
Series BB, 4.00%, 06/15/47 | 3,660 | 3,865,948 | ||||||
Series CC, 5.00%, 06/15/47 | 6,000 | 6,765,987 | ||||||
Hudson Yards Infrastructure Corp., RB, Senior-Fiscal 2012: | ||||||||
5.75%, 02/15/21(b)(j) | 1,548 | 1,603,327 | ||||||
5.75%, 02/15/47 | 952 | 986,318 | ||||||
New York Liberty Development Corp., ARB, 1 World Trade Center Port Authority Consolidated Bonds, 5.25%, 12/15/43 | 2,505 | 2,640,070 | ||||||
| Security | Par (000) | Value | ||||||
| New York (continued) | ||||||||
State of New York Thruway Authority, Refunding RB, Transportation, Personal Income Tax, Series A, 5.00%, 03/15/31 | $ | 1,560 | $ | 1,644,022 | ||||
|
| |||||||
| 21,854,812 | ||||||||
| Texas — 6.2% | ||||||||
City of Houston Texas Community College, GO, Limited Tax, 4.00%, 02/15/43 | 2,998 | 3,212,353 | ||||||
City of San Antonio Texas Electric & Gas Systems Revenue, RB, Junior Lien, 5.00%, 02/01/43 | 1,580 | 1,739,027 | ||||||
City of San Antonio Texas Water System, Refunding RB, Water System, Junior Lien, Series C, 5.00%, 05/15/46 | 1,515 | 1,828,272 | ||||||
El Paso Independent School District, GO, (PSF-GTD), 4.00%, 08/15/48 | 2,999 | 3,551,454 | ||||||
|
| |||||||
| 10,331,106 | ||||||||
| Virginia — 2.7% | ||||||||
Hampton Roads Transportation Accountability Commission, RB, Transportation Fund, Senior Lien, Series A, 5.00%, 07/01/48 | 1,996 | 2,461,917 | ||||||
Virginia Small Business Financing Authority, Refunding RB, Bon Secours Health System, Series A, 4.00%, 12/01/49 | 1,860 | 2,032,310 | ||||||
|
| |||||||
| 4,494,227 | ||||||||
| Washington — 4.0% | ||||||||
Washington Metropolitan Area Transit Authority, RB, Series B, 5.00%, 07/01/42 | 2,992 | 3,501,974 | ||||||
Washington State Convention Center Public Facilities District, RB, 5.00%, 07/01/58 | 3,000 | 3,204,240 | ||||||
|
| |||||||
| 6,706,214 | ||||||||
|
| |||||||
Total Municipal Bonds Transferred to Tender Option Bond Trusts — 34.7% |
| 57,772,953 | ||||||
|
| |||||||
Total Long-Term Investments — 166.9% |
| 277,957,404 | ||||||
|
| |||||||
| 8 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) (Percentages shown are based on Net Assets) |
| Security | Value | |||
Other Assets Less Liabilities — 2.0% | 3,327,487 | |||
Liability for TOB Trust Certificates, Including Interest Expense and Fees Payable — (20.9)% | (34,849,803 | ) | ||
VMTP Shares, at Liquidation Value — (48.0)% | (79,900,000 | ) | ||
|
| |||
Net Assets Applicable to Common Shares — 100.0% | $ | 166,535,088 | ||
|
| |||
| (a) | Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration to qualified institutional investors. |
| (b) | U.S. Government securities held in escrow, are used to pay interest on this security as well as to retire the bond in full at the date indicated, typically at a premium to par. |
| (c) | Step-up bond that pays an initial coupon rate for the first period and then a higher coupon rate for the following periods. Rate as of period end. |
| (d) | Zero-coupon bond. |
| (e) | Security is valued using significant unobservable inputs and is classified as Level 3 in the fair value hierarchy. |
| (f) | Non-income producing security. |
| (g) | Issuer filed for bankruptcy and/or is in default. |
| (h) | Variable or floating rate security, which interest rate adjusts periodically based on changes in current interest rates and prepayments on the underlying pool of assets. Rate shown is the rate in effect as of period end. |
| (i) | Represent bonds transferred to a TOB Trust in exchange of cash and residual certificates received by the Trust. These bonds serve as collateral in a secured borrowing. |
| (j) | All or a portion of the security is subject to a recourse agreement. The aggregate maximum potential amount the Trust could ultimately be required to pay under the agreements, which expire between August 15, 2020 to August 1, 2027, is $3,678,118. |
Investments in issuers considered to be an affiliate/affiliates of the Trust during the period ended May 31, 2020 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, and/or related parties of the were as follows:
| Affiliated Issuer | Shares Held at 08/31/19 | Shares Purchased | Shares Sold | Shares Held at 05/31/20 | Value at 05/31/20 | Income | Net Realized Gain (Loss) (a) | Change in Unrealized Appreciation (Depreciation) | ||||||||||||||||||||||||
BlackRock Liquidity Funds, MuniCash, Institutional Class(b) | 7,802 | — | (7,802 | )(c) | — | $ | — | $ | 8,979 | $ | 2,153 | $ | — | |||||||||||||||||||
|
|
|
|
|
|
|
| |||||||||||||||||||||||||
| (a) | Includes net capital gain distributions, if applicable. |
| (b) | As of period end, the entity is no longer held by the Trust. |
| (c) | Represents net shares purchased (sold). |
| Portfolio Abbreviations | ||
| AGC | Assured Guarantee Corp. | |
| AGM | Assured Guaranty Municipal Corp. | |
| AMBAC | American Municipal Bond Assurance Corp. | |
| AMT | Alternative Minimum Tax (subject to) | |
| ARB | Airport Revenue Bonds | |
| CAB | Capital Appreciation Bonds | |
| COP | Certificates of Participation | |
| EDA | Economic Development Authority | |
| FHA | Federal Housing Administration | |
| GARB | General Airport Revenue Bonds | |
| GO | General Obligation Bonds | |
| HDA | Housing Development Authority | |
| HFA | Housing Finance Agency | |
| IDA | Industrial Development Authority | |
| 9 |
Schedule of Investments (unaudited) (continued) May 31, 2020 | BlackRock Municipal Bond Trust (BBK) |
| Portfolio Abbreviations (continued) | ||
| ISD | Independent School District | |
| M/F | Multi-Family | |
| NPFGC | National Public Finance Guarantee Corp. | |
| PILOT | Payment in Lieu of Taxes | |
| PSF-GTD | Permanent School Fund Guaranteed | |
| RB | Revenue Bonds | |
| S/F | Single-Family | |
Fair Value Hierarchy as of Period End
Various inputs are used in determining the fair value of investments. These inputs to valuation techniques are categorized into a fair value hierarchy consisting of three broad levels for financial reporting purposes as follows:
| • | Level 1 — Unadjusted price quotations in active markets/exchanges for identical assets or liabilities that the Trust has the ability to access |
| • | Level 2 — Other observable inputs (including, but not limited to, quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market-corroborated inputs) |
| • | Level 3 — Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the BlackRock Global Valuation Methodologies Committee’s (the “Global Valuation Committee’s”) assumptions used in determining the fair value of investments) |
The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the fair value hierarchy classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Investments classified within Level 3 have significant unobservable inputs used by the Global Valuation Committee in determining the price for Fair Valued Investments. Level 3 investments include equity or debt issued by privately held companies or funds. There may not be a secondary market, and/or there are a limited number of investors. The categorization of a value determined for investments is based on the pricing transparency of the investments and is not necessarily an indication of the risks associated with investing in those securities. For information about the Trust’s policy regarding valuation of investments, refer to the Trust’s most recent financial statements as contained in its semi-annual report.
The following tables summarize the Trust’s investments categorized in the disclosure hierarchy:
| Level 1 | Level 2 | Level 3 | Total | |||||||||||||
Assets: |
| |||||||||||||||
Investments: |
| |||||||||||||||
Long-Term Investments(a) | $ | — | $ | 277,544,604 | $ | 412,800 | $ | 277,957,404 | ||||||||
|
|
|
|
|
|
|
| |||||||||
| (a) | See above Schedule of Investments for values in each state or political subdivision. |
The Trust may hold assets and/or liabilities in which the fair value approximates the carrying amount for financial reporting purposes. As of period end, such assets and/or liabilities are categorized within the disclosure hierarchy as follows:
| Level 1 | Level 2 | Level 3 | Total | |||||||||||||
Liabilities: |
| |||||||||||||||
TOB Trust Certificates | $ | — | $ | (34,682,724 | ) | $ | — | $ | (34,682,724 | ) | ||||||
VMTP Shares at Liquidation Value | — | (79,900,000 | ) | — | (79,900,000 | ) | ||||||||||
|
|
|
|
|
|
|
| |||||||||
| $ | — | $ | (114,582,724 | ) | $ | — | $ | (114,582,724 | ) | |||||||
|
|
|
|
|
|
|
| |||||||||
| 10 |
