Schedule of Investments (unaudited)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)

Security
 
Par
(000)
Value
Municipal Bonds
Alabama — 5.3%
Black Belt Energy Gas District, RB(a)
 
Series A, 5.25%, 01/01/54
$
4,770
$ 5,195,999
Series A, 5.25%, 05/01/55
 
2,180
2,404,126
Series C-1, 5.25%, 02/01/53
 
13,790
14,846,365
Series F, 5.50%, 11/01/53
 
1,825
1,958,134
Black Belt Energy Gas District, Refunding RB, 4.00%,
06/01/51(a)
 
8,585
8,866,464
Chelsea Park Cooperative District, SAB, 5.00%,
05/01/48
 
920
902,543
County of Jefferson Alabama Sewer Revenue,
Refunding RB, 5.25%, 10/01/49
 
2,230
2,425,054
Energy Southeast A Cooperative District, RB,
Series B, 5.25%, 07/01/54(a)
 
2,065
2,284,154
Hoover Industrial Development Board, RB, AMT,
Sustainability Bonds, 6.38%, 11/01/50(a)
 
5,620
6,324,380
MidCity Improvement District, SAB
 
4.25%, 11/01/32
 
350
331,859
4.50%, 11/01/42
 
745
661,558
4.75%, 11/01/49
 
795
698,246
Mobile County Industrial Development Authority, RB,
Series A, AMT, 5.00%, 06/01/54
 
11,890
12,335,544
Southeast Alabama Gas Supply District, Refunding
RB, Series A, 5.00%, 08/01/54(a)
 
5,000
5,451,300
Southeast Energy Authority A Cooperative District,
RB, Series B-1, 5.00%, 05/01/53(a)
 
20,435
21,582,510
Sumter County Industrial Development Authority, RB,
AMT, Sustainability Bonds, 6.00%, 07/15/52(a)
 
203
103,575
Tuscaloosa County Industrial Development Authority,
Refunding RB, Series A, 5.25%, 05/01/44(b)
 
1,110
1,132,028
 
 
87,503,839
Arizona — 2.4%
Arizona Industrial Development Authority, RB
 
7.10%, 01/01/55(b)
 
4,495
4,642,513
Series A, 5.00%, 12/15/39(b)
 
150
151,303
Series A, 5.00%, 07/01/49(b)
 
1,440
1,391,162
Series A, 5.00%, 07/15/49
 
675
678,435
Series A, 5.00%, 07/01/54(b)
 
1,110
1,063,420
Series B, 5.13%, 07/01/47(b)
 
420
422,979
Series B, 5.25%, 07/01/51(b)
 
570
575,190
Sustainability Bonds, 5.00%, 07/01/45(b)
 
1,135
1,111,115
Sustainability Bonds, 5.00%, 07/01/55(b)
 
1,215
1,162,146
Arizona Industrial Development Authority, Refunding
RB(b)
 
Series A, 5.00%, 07/01/26
 
325
326,969
Series A, 5.50%, 07/01/52
 
2,970
2,985,305
Glendale Industrial Development Authority, RB,
5.00%, 05/15/56
 
275
266,667
Industrial Development Authority of the County of
Pima, RB
 
5.13%, 07/01/39
 
700
685,198
5.25%, 07/01/49
 
870
821,130
Industrial Development Authority of the County of
Pima, Refunding RB(b)
 
4.00%, 06/15/51
 
6,995
6,074,963
5.00%, 07/01/56
 
1,255
1,246,654
La Paz County Industrial Development Authority, RB,
5.88%, 06/15/48(b)
 
1,340
1,349,958
Maricopa County Industrial Development Authority,
RB
 
5.25%, 10/01/40(b)
 
1,255
1,219,689
Security
 
Par
(000)
Value
Arizona (continued)
Maricopa County Industrial Development Authority,
RB(continued)
 
5.50%, 10/01/51(b)
$
1,255
$ 1,174,019
Series A, 3.00%, 09/01/51
 
2,995
2,313,384
AMT, 4.00%, 10/15/47(b)
 
5,375
4,890,383
Sierra Vista Industrial Development Authority, RB(b)
 
06/15/34(c)
 
150
156,716
5.38%, 06/15/34
 
325
328,282
06/15/44(c)
 
1,340
1,353,866
6.00%, 06/15/44
 
545
552,304
06/15/54(c)
 
1,485
1,495,497
6.30%, 06/15/54
 
890
912,018
 
 
39,351,265
Arkansas — 2.7%
Arkansas Development Finance Authority, RB
 
AMT, 4.50%, 09/01/49(b)
 
14,525
14,415,201
AMT, 4.75%, 09/01/49(b)
 
14,255
14,240,155
AMT, Sustainability Bonds, 7.38%, 07/01/48(b)
 
7,700
8,568,848
AMT, Sustainability Bonds, 5.70%, 05/01/53
 
2,040
2,160,566
Series A, AMT, Sustainability Bonds, 6.88%,
07/01/48(b)
 
5,100
5,625,638
 
 
45,010,408
California — 5.3%
California Infrastructure & Economic Development
Bank, RB, Series A-4, AMT, 8.00%, 01/01/50(a)(b)
 
30,355
30,884,582
California Municipal Finance Authority, ARB, AMT,
Senior Lien, 4.00%, 12/31/47
 
2,560
2,430,343
California Municipal Finance Authority, RB(b)
 
5.50%, 08/01/34
 
250
246,211
6.00%, 08/01/44
 
655
649,997
6.13%, 08/01/49
 
570
569,928
Series A, 5.00%, 05/01/34
 
300
311,122
Series A, 5.50%, 05/01/44
 
350
359,244
Series A, 5.75%, 05/01/54
 
435
446,731
Series A, 5.88%, 05/01/59
 
190
198,045
California Municipal Finance Authority, ST
 
Series A, 5.00%, 09/01/44
 
325
335,127
Series A, 5.00%, 09/01/49
 
675
685,942
Series A, 5.00%, 09/01/54
 
345
353,336
California Statewide Financing Authority, RB,
Series L, 0.00%, 06/01/55(b)(d)
 
65,000
3,928,068
City of Los Angeles Department of Airports,
Refunding ARB, AMT, 5.25%, 05/15/47
 
8,000
8,714,945
CSCDA Community Improvement Authority, RB, M/F
Housing(b)
 
Series A, 3.00%, 09/01/56
 
5,550
4,093,177
Mezzanine Lien, 4.00%, 03/01/57
 
2,465
1,940,560
Series B, Mezzanine Lien, Sustainability Bonds,
4.00%, 12/01/59
 
4,645
3,054,016
Series B, Sub Lien, Sustainability Bonds, 4.00%,
12/01/59
 
2,380
1,632,462
Sustainability Bonds, 4.00%, 07/01/56
 
1,660
1,347,485
Sustainability Bonds, 4.00%, 07/01/58
 
1,405
1,030,421
Series B, Sustainability Bonds, 4.00%, 07/01/58
 
1,585
1,110,682
Golden State Tobacco Securitization Corp.,
Refunding RB, CAB, Series B-2, Subordinate,
0.00%, 06/01/66(d)
 
112,065
13,294,026
Hastings Campus Housing Finance Authority, RB,
CAB, Sub-Series A, Sustainability Bonds, 6.75%,
07/01/61(b)(e)
 
4,420
2,096,393
Schedule of Investments
1

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
California (continued)
Inland Empire Tobacco Securitization Corp., RB,
Series C-1, 0.00%, 06/01/36(d)
$
10,695
$ 4,931,610
Rancho Mirage Community Facilities District, ST
 
Series A, 5.00%, 09/01/49
 
1,030
1,071,569
Series A, 5.00%, 09/01/54
 
200
207,129
San Diego County Regional Airport Authority, ARB,
Series B, AMT, Subordinate, 4.00%, 07/01/56
 
1,965
1,845,299
San Francisco City & County Redevelopment Agency
Successor Agency, TA, CAB, Series D, 0.00%,
08/01/31(b)(d)
 
1,155
831,691
 
 
88,600,141
Colorado — 4.9%
9th Avenue Metropolitan District No. 2, GOL, 5.00%,
12/01/48
 
1,563
1,471,313
Aurora Crossroads Metropolitan District No. 2, GOL
 
Series A, 5.00%, 12/01/40
 
1,000
1,008,555
Series A, 5.00%, 12/01/50
 
500
491,188
Aviation Station North Metropolitan District No. 2,
GOL
 
Series A, 5.00%, 12/01/39
 
750
755,730
Series A, 5.00%, 12/01/48
 
1,350
1,311,886
Banning Lewis Ranch Metropolitan District No. 8,
GOL, 4.88%, 12/01/51(b)
 
2,335
1,949,400
Baseline Metropolitan District No. 1, GO, Series B,
12/15/54(c)
 
1,780
1,815,083
Cascade Ridge Metropolitan District, GOL, 5.00%,
12/01/51
 
3,000
2,736,591
Centerra Metropolitan District No. 1, TA, 5.00%,
12/01/47(b)
 
820
807,934
City & County of Denver Colorado Airport System
Revenue, Refunding ARB
 
Series A, AMT, 4.13%, 11/15/47
 
5,875
5,777,670
Series A, AMT, 4.13%, 11/15/53
 
3,225
3,089,818
Colorado Educational & Cultural Facilities Authority,
Refunding RB, 4.00%, 12/01/30(b)
 
805
771,702
Colorado Health Facilities Authority, RB
 
5.50%, 11/01/47
 
780
876,523
5.25%, 11/01/52
 
1,630
1,770,534
Series A, 5.00%, 05/15/35
 
1,255
1,070,881
Series A, 5.00%, 05/15/44
 
1,415
1,052,345
Series A, 5.00%, 05/15/49
 
2,175
1,526,752
Constitution Heights Metropolitan District, Refunding
GOL, 5.00%, 12/01/49
 
1,260
1,219,765
Eagle Brook Meadows Metropolitan District No. 3,
GOL, Series 2021, 5.00%, 12/01/51
 
1,600
1,484,488
Fitzsimons Village Metropolitan District No. 3,
Refunding GOL
 
Series A-1, 4.00%, 12/01/26
 
800
796,852
Series A-1, 4.00%, 12/01/41
 
1,500
1,351,673
Series A-1, 4.25%, 12/01/55
 
3,095
2,580,763
Four Corners Business Improvement District, GOL,
6.00%, 12/01/52
 
2,000
2,071,454
Green Valley Ranch East Metropolitan District No. 6,
GOL, Series A, 5.88%, 12/01/50
 
2,615
2,638,863
Home Place Metropolitan District, GOL, Series A,
5.75%, 12/01/50
 
2,345
2,353,387
Horizon Metropolitan District No. 2, GOL, 4.50%,
12/01/51(b)
 
1,675
1,268,272
Jefferson Center Metropolitan District No. 1, RB
 
Series A-2, 4.13%, 12/01/40
 
580
567,432
Security
 
Par
(000)
Value
Colorado (continued)
Jefferson Center Metropolitan District No. 1,
RB(continued)
 
Series A-2, 4.38%, 12/01/47
$
1,000
$ 973,375
Karls Farm Metropolitan District No. 2, GOL(b)
 
Series A, 5.38%, 12/01/40
 
515
519,942
Series A, 5.63%, 12/01/50
 
1,350
1,350,602
Lanterns Metropolitan District No. 2, GOL, Series A,
4.50%, 12/01/50
 
1,810
1,474,836
Longs Peak Metropolitan District, GOL, 5.25%,
12/01/51(b)
 
5,000
5,041,888
Loretto Heights Community Authority, RB, 4.88%,
12/01/51
 
2,640
2,207,052
North Holly Metropolitan District, GOL, Series A,
5.50%, 12/01/48
 
760
761,863
North Range Metropolitan District No. 3, GOL,
Series A, 5.25%, 12/01/50
 
1,000
1,000,039
Palisade Metropolitan District No. 2, GOL,
Subordinate, 7.25%, 12/15/49
 
2,825
2,754,875
Pomponio Terrace Metropolitan District, GOL,
Series A, 5.00%, 12/01/49
 
1,442
1,393,833
Poudre Heights Valley Metropolitan District, GOL,
Series A, 12/01/54(c)
 
975
975,011
Prairie Farm Metropolitan District, GOL, Series A,
5.25%, 12/01/48
 
1,238
1,240,121
Pronghorn Valley Metropolitan District, GOL,
Series A, 4.00%, 12/01/51
 
1,300
1,064,757
Pueblo Urban Renewal Authority, TA, 4.75%,
12/01/45(b)
 
3,045
2,062,987
Reunion Metropolitan District, RB, Series A, 3.63%,
12/01/44
 
1,484
1,149,245
Riverpark Metropolitan District/Arapahoe County,
GOL
 
6.00%, 12/01/42
 
650
671,139
6.38%, 12/01/54
 
1,000
1,036,022
Sky Ranch Community Authority Board, RB, Series A,
5.75%, 12/01/52
 
1,500
1,533,298
St. Vrain Lakes Metropolitan District No. 4, GOL,
Series A, 6.75%, 09/20/54(b)(e)
 
2,700
1,952,953
Sterling Ranch Community Authority Board, RB,
Series B, Subordinate, 7.13%, 12/15/50
 
708
715,428
Thompson Crossing Metropolitan District No. 4,
Refunding GOL, 5.00%, 12/01/49
 
1,480
1,457,209
Timberleaf Metropolitan District, GOL, Series A,
5.75%, 12/01/50
 
1,730
1,667,548
Waters Edge Metropolitan District No. 2, GOL,
5.00%, 12/01/51
 
2,595
2,452,695
Westcreek Metropolitan District No. 2, GOL, Series A,
5.38%, 12/01/48
 
800
804,784
Wild Plum Metropolitan District, GOL, Series A,
5.00%, 12/01/24(f)
 
595
614,808
 
 
81,493,164
Connecticut — 0.9%
Connecticut State Health & Educational Facilities
Authority, RB
 
Series A, 5.00%, 01/01/45(b)
 
845
792,642
Series A, 5.00%, 01/01/55(b)
 
1,500
1,332,359
Series A, Sustainability Bonds, 5.38%, 07/01/54
 
2,915
3,010,012
Mohegan Tribal Finance Authority, RB, 7.00%,
02/01/45(b)
 
10,290
10,291,327
 
 
15,426,340
2

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Delaware — 0.4%
Affordable Housing Opportunities Trust, RB,
Series AH-01, Class B, 6.88%, 05/01/39(b)
$
3,619
$ 3,584,167
County of Kent Delaware, RB, Series A, 5.00%,
07/01/53
 
1,000
1,011,169
Town of Bridgeville Delaware, ST(b)
 
5.25%, 07/01/44
 
135
145,383
5.63%, 07/01/53
 
315
342,565
Town of Milton Delaware, ST(b)
 
5.70%, 09/01/44
 
600
621,968
5.95%, 09/01/53
 
1,000
1,043,949
 
 
6,749,201
District of Columbia — 1.7%
District of Columbia Tobacco Settlement Financing
Corp., RB(d)
 
Series A, 0.00%, 06/15/46
 
15,740
3,590,466
Series B, 0.00%, 06/15/46
 
43,620
9,744,032
Series C, 0.00%, 06/15/55
 
57,200
6,125,182
District of Columbia Tobacco Settlement Financing
Corp., Refunding RB, 6.75%, 05/15/40
 
325
335,375
District of Columbia, RB, Series A, AMT, Sustainability
Bonds, 5.50%, 02/28/37
 
880
1,035,599
District of Columbia, Refunding RB, 5.00%, 06/01/46
 
2,205
2,219,131
Metropolitan Washington Airports Authority Dulles Toll
Road Revenue, Refunding RB
 
Series B, 2nd Lien, (AGC), 0.00%, 10/01/30(d)
 
3,005
2,487,017
Series B, Subordinate, 4.00%, 10/01/49
 
2,170
2,094,050
 
 
27,630,852
Florida — 14.5%
Antillia Community Development District, SAB
 
5.00%, 05/01/31
 
250
255,434
5.60%, 05/01/44
 
570
602,387
Artisan Lakes East Community Development District,
SAB, Series 2021-1, 4.00%, 05/01/51
 
450
382,576
Avenir Community Development District, SAB, 4.75%,
11/01/50(b)
 
4,384
4,348,361
Babcock Ranch Community Independent Special
District, SAB
 
Series 2022, 5.00%, 05/01/42
 
1,570
1,592,218
Series 2022, 5.00%, 05/01/53
 
1,175
1,169,275
Bella Collina Community Development District, SAB
 
5.00%, 05/01/44
 
180
180,404
5.30%, 05/01/55
 
550
551,618
Berry Bay II Community Development District, SAB
 
Series 2024, 5.20%, 05/01/44
 
550
553,688
Series 2024, 5.45%, 05/01/54
 
255
256,580
Boggy Branch Community Development District,
SAB, 4.00%, 05/01/51
 
1,360
1,156,268
Boggy Creek Improvement District, Refunding SAB,
Series 2013, 5.13%, 05/01/43
 
1,090
1,090,183
Brevard County Health Facilities Authority, Refunding
RB(b)
 
4.00%, 11/15/45
 
4,040
3,338,131
4.00%, 11/15/55
 
5,960
4,599,075
Buckhead Trails Community Development District,
SAB
 
5.60%, 05/01/44
 
400
408,961
5.88%, 05/01/54
 
975
995,828
Series 2022, 5.63%, 05/01/42
 
740
788,798
Series 2022, 5.75%, 05/01/52
 
495
519,749
Security
 
Par
(000)
Value
Florida (continued)
Cabot Citrus Farms Community Development District,
SAB, 5.25%, 03/01/29
$
2,755
$ 2,801,797
Capital Projects Finance Authority, RB(b)
 
6.13%, 06/15/44
 
210
213,617
6.50%, 06/15/54
 
275
284,852
Capital Region Community Development District,
Refunding SAB, Series A-1, 5.13%, 05/01/39
 
2,120
2,151,491
Capital Trust Agency, Inc., RB
 
4.50%, 01/01/35(b)
 
2,250
2,272,076
4.88%, 06/15/56(b)
 
6,670
5,234,746
Series A, 5.00%, 06/15/49(b)
 
500
481,125
Series A, 5.00%, 12/15/49
 
975
975,917
Series A, 5.75%, 06/01/54(b)
 
1,925
1,662,687
Series A, 5.00%, 12/15/54
 
1,050
1,050,152
Series B, 0.00%, 01/01/35(d)
 
3,135
1,718,135
Series B, 0.00%, 01/01/60(d)
 
64,500
5,360,272
Capital Trust Agency, Inc., RB, CAB, 0.00%,
07/01/61(b)(d)
 
41,470
3,191,559
Capital Trust Authority, RB(b)(c)
 
07/01/44
 
680
685,689
07/01/54
 
1,190
1,193,902
Celebration Pointe Community Development District
No. 1, SAB, 5.00%, 05/01/34
 
1,180
1,180,288
Central Parc Community Development District, SAB
 
5.70%, 05/01/44
 
750
798,311
6.00%, 05/01/54
 
650
694,665
Charles Cove Community Development District, SAB
 
3.75%, 05/01/30
 
360
351,069
4.25%, 05/01/40
 
975
911,841
4.38%, 05/01/50
 
1,505
1,339,119
Charlotte County Industrial Development Authority,
RB, 5.00%, 10/01/49(b)
 
3,040
3,049,063
Collier County Industrial Development Authority,
Refunding RB, Series A, 8.13%, 05/15/44(b)(g)(h)
 
370
6,882
Coral Creek Community Development District, SAB,
5.75%, 05/01/54
 
545
572,221
County of Lake Florida, RB, 5.00%, 01/15/49(b)
 
825
789,010
County of Osceola Florida Transportation Revenue,
Refunding RB, CAB(d)
 
Series A-2, 0.00%, 10/01/48
 
5,125
1,678,870
Series A-2, 0.00%, 10/01/49
 
1,770
549,687
Crossings Community Development District, SAB,
5.60%, 05/01/54
 
530
541,547
Crosswinds East Community Development District,
SAB, 5.75%, 05/01/54
 
380
398,980
Darby Community Development District, SAB,
Series A-2, 5.88%, 05/01/35
 
4,325
4,497,718
Elevation Pointe Community Development District,
SAB
 
Series A-1, 4.40%, 05/01/42
 
700
669,001
Series A-1, 4.60%, 05/01/52
 
1,090
1,017,266
Series A-2, 4.40%, 05/01/32
 
2,200
2,149,258
Escambia County Health Facilities Authority,
Refunding RB
 
(AGM), 3.00%, 08/15/50
 
10,000
7,657,732
4.00%, 08/15/50
 
6,530
5,858,132
Florida Development Finance Corp., RB
 
5.25%, 06/01/55(b)
 
2,830
2,738,824
6.50%, 06/30/57(b)(g)(h)
 
1,002
707,443
Series A, 5.75%, 06/15/29(b)
 
695
695,623
Series A, 6.00%, 06/15/34(b)
 
835
835,738
Schedule of Investments
3

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Florida (continued)
Florida Development Finance Corp., RB(continued)
 
Series A, 4.00%, 06/15/52
$
2,875
$ 2,480,318
Series A, 5.00%, 06/15/56
 
1,525
1,535,269
Series A, 5.13%, 06/15/55(b)
 
10,455
9,757,979
Series B, 4.50%, 12/15/56(b)
 
5,945
4,478,675
Series C, 5.75%, 12/15/56(b)
 
2,030
1,695,994
AMT, 5.00%, 05/01/29(b)
 
3,550
3,616,772
AMT, 6.13%, 07/01/32(a)(b)
 
5,000
5,135,574
Class A, AMT, 8.25%, 07/01/57(a)(b)
 
4,000
4,060,747
Florida Development Finance Corp., Refunding RB
 
Series A, 4.00%, 06/01/36(b)
 
2,110
1,927,719
Series A, 4.00%, 06/01/46(b)
 
1,700
1,396,961
Series A, 4.00%, 06/01/55(b)
 
2,750
2,102,881
AMT, 12.00%, 07/15/32(a)(b)
 
10,860
11,543,395
AMT, (AGM), 5.25%, 07/01/53
 
12,075
12,632,013
Gardens at Hammock Beach Community
Development District, SAB
 
Series 1, 4.80%, 05/01/31
 
195
197,894
Series 1, 5.38%, 05/01/44
 
305
317,119
Series 1, 5.65%, 05/01/54
 
525
547,268
Series 2, 5.00%, 05/01/31
 
270
276,179
Series 2, 5.60%, 05/01/44
 
995
1,051,514
Series 2, 5.88%, 05/01/55
 
360
380,917
Golden Gem Community Development District, SAB
 
5.15%, 05/01/31
 
535
552,041
5.70%, 05/01/44
 
2,900
3,086,777
6.00%, 05/01/55
 
1,010
1,078,182
Grand Oaks Community Development District, SAB
 
4.25%, 05/01/40
 
910
851,051
4.50%, 05/01/52
 
1,015
911,077
Hammock Oaks Community Development District,
SAB
 
5.85%, 05/01/44
 
125
134,476
6.15%, 05/01/54
 
865
934,189
Hills of Minneola Community Development District,
SAB(b)
 
4.00%, 05/01/40
 
1,025
949,254
4.00%, 05/01/50
 
1,500
1,281,420
Hobe-St Lucie Conservancy District, SAB, 5.88%,
05/01/55
 
635
671,922
Hyde Park Community Development District No. 1,
SAB
 
Series A, 4.75%, 05/01/31
 
290
291,912
Series A, 5.35%, 05/01/44
 
425
434,213
Series A, 5.63%, 05/01/55
 
690
705,195
Lakes of Sarasota Community Development District,
SAB
 
Series A, 4.75%, 05/01/31
 
355
356,550
Series A, 5.30%, 05/01/44
 
425
431,829
Series A, 5.60%, 05/01/55
 
695
708,970
Lakeside Preserve Community Development District,
SAB, Series 2023, 6.38%, 05/01/54
 
1,000
1,096,890
Lakewood Ranch Stewardship District, SAB
 
4.95%, 05/01/29(b)
 
175
177,759
4.63%, 05/01/31
 
215
218,249
4.88%, 05/01/35
 
265
265,395
5.50%, 05/01/39(b)
 
160
165,424
5.30%, 05/01/44
 
385
395,520
4.88%, 05/01/45
 
530
529,999
5.13%, 05/01/46
 
835
837,714
5.65%, 05/01/48(b)
 
225
231,237
5.55%, 05/01/54
 
180
184,086
Security
 
Par
(000)
Value
Florida (continued)
Lakewood Ranch Stewardship District,
SAB(continued)
 
Series 1A, 4.25%, 05/01/28
$
440
$ 439,607
Series 1A, 5.00%, 05/01/38
 
1,175
1,188,730
Series 1A, 5.10%, 05/01/48
 
2,545
2,556,031
Series 1B, 4.75%, 05/01/29
 
955
965,291
Series 1B, 5.30%, 05/01/39
 
1,090
1,118,051
Series 1B, 5.45%, 05/01/48
 
1,930
1,967,853
Lee County Industrial Development Authority, RB,
Series B-1, 4.75%, 11/15/29
 
985
994,778
LT Ranch Community Development District, SAB
 
5.50%, 05/01/44
 
795
834,144
5.85%, 05/01/54
 
600
634,474
LTC Ranch West Residential Community
Development District, Refunding SAB
 
5.38%, 05/01/44
 
345
356,024
5.65%, 05/01/54
 
1,250
1,292,084
LTC Ranch West Residential Community
Development District, SAB
 
Series AA2, 5.70%, 05/01/44
 
185
190,568
Series AA2, 6.00%, 05/01/54
 
250
257,898
Malabar Springs Community Development District,
SAB
 
5.20%, 05/01/44
 
605
610,594
5.50%, 05/01/54
 
905
915,993
Marion Ranch Community Development District, SAB
 
5.10%, 05/01/31
 
250
256,308
5.70%, 05/01/44
 
595
633,318
5.95%, 05/01/54
 
230
244,937
Midtown Miami Community Development District,
Refunding SAB, Series A, 5.00%, 05/01/37
 
890
890,140
Normandy Community Development District, SAB,
5.55%, 05/01/54(b)
 
1,510
1,520,262
North AR-1 Pasco Community Development District,
SAB
 
Series A, 5.75%, 05/01/44
 
240
256,372
Series A, 6.00%, 05/01/54
 
425
454,207
North River Ranch Community Development District,
SAB
 
Series A-1, 4.00%, 05/01/40
 
845
767,343
Series A-1, 4.25%, 05/01/51
 
1,430
1,239,249
Series A-2, 4.20%, 05/01/35
 
480
458,559
Orange County Health Facilities Authority, RB, 4.00%,
10/01/52
 
2,310
2,217,648
Parrish Lakes Community Development District, SAB
 
5.00%, 05/01/31
 
500
506,563
5.50%, 05/01/44
 
1,000
1,030,054
5.80%, 05/01/54
 
315
325,716
Parrish Plantation Community Development District,
SAB
 
5.80%, 05/01/44
 
480
514,566
5.88%, 05/01/54
 
375
397,250
6.05%, 05/01/54
 
900
965,230
Poitras East Community Development District, SAB
 
5.00%, 05/01/43
 
460
466,000
5.25%, 05/01/52
 
1,650
1,672,603
Sandridge Community Development District, SAB
 
Series A1, 3.88%, 05/01/41
 
615
556,488
Series A1, 4.00%, 05/01/51
 
600
508,819
Sawyers Landing Community Development District,
SAB, 4.25%, 05/01/53
 
3,520
2,944,985
4

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Florida (continued)
Seminole County Industrial Development Authority,
Refunding RB, 5.75%, 11/15/54
$
2,420
$ 2,447,592
Seminole Palms Community Development District,
SAB, 5.50%, 05/01/55(b)
 
955
963,802
Shadowlawn Community Development District, SAB,
5.85%, 05/01/54
 
355
375,397
Somerset Bay Community Development District,
SAB(b)
 
4.85%, 05/01/31
 
350
355,793
5.63%, 05/01/44
 
925
979,321
5.90%, 05/01/54
 
905
960,394
South Broward Hospital District, RB, (BAM-TCRS),
3.00%, 05/01/51
 
415
332,021
Southern Groves Community Development District
No. 5, SAB
 
3.38%, 05/01/25
 
100
99,596
4.00%, 05/01/30
 
175
173,991
4.30%, 05/01/40
 
825
802,312
4.50%, 05/01/46
 
600
578,154
Talavera Community Development District, SAB,
4.35%, 05/01/40
 
520
499,604
Tolomato Community Development District,
Refunding SAB
 
Series 2015-2, 6.61%, 05/01/40(e)
 
125
124,425
Series A-2, 4.25%, 05/01/37
 
910
877,658
Tolomato Community Development District, SAB,
Series 2015-3, 6.61%, 05/01/40(g)(h)
 
135
1
Trout Creek Community Development District, SAB
 
5.38%, 05/01/38
 
670
687,159
5.50%, 05/01/49
 
1,695
1,722,893
Two Rivers West Community Development District,
SAB(b)
 
Series 2024, 4.80%, 05/01/31
 
250
253,712
Series 2024, 5.63%, 05/01/44
 
750
794,041
Series 2024, 5.88%, 05/01/54
 
895
948,099
V-Dana Community Development District, SAB(b)
 
3.50%, 05/01/31
 
525
507,212
4.00%, 05/01/40
 
750
691,828
4.00%, 05/01/51
 
1,200
1,020,231
Village Community Development District No. 14, SAB
 
5.38%, 05/01/42
 
3,285
3,462,150
5.50%, 05/01/53
 
2,450
2,566,456
Village Community Development District No. 15,
SAB(b)
 
05/01/44(c)
 
250
252,604
5.25%, 05/01/54
 
1,040
1,084,902
05/01/55(c)
 
2,400
2,424,805
Volusia County Educational Facility Authority, RB,
5.25%, 06/01/49
 
2,680
2,844,427
West Villages Improvement District, SAB
 
4.25%, 05/01/29
 
400
400,307
4.75%, 05/01/39
 
885
889,542
5.38%, 05/01/44
 
495
514,676
5.00%, 05/01/50
 
1,415
1,411,014
5.63%, 05/01/54
 
355
369,398
Westside Haines City Community Development
District, SAB, 6.00%, 05/01/54
 
805
860,322
 
 
240,796,934
Georgia — 1.3%
Atlanta Development Authority, TA(b)
 
Series A, 5.00%, 04/01/34
 
1,720
1,773,251
Security
 
Par
(000)
Value
Georgia (continued)
Atlanta Development Authority, TA(b)(continued)
 
Series A, 5.50%, 04/01/39
$
2,640
$ 2,719,992
Atlanta Urban Redevelopment Agency, RB, 3.88%,
07/01/51(b)
 
2,805
2,355,765
Dalton Whitfield County Joint Development Authority,
RB, 4.00%, 08/15/48
 
3,135
3,051,333
Development Authority of Cobb County, RB, Series A,
6.38%, 06/15/58(b)
 
690
720,200
East Point Business & Industrial Development
Authority, RB, Series A, 5.25%, 06/15/62(b)
 
875
877,713
Main Street Natural Gas, Inc., RB, Series A, 5.00%,
06/01/53(a)
 
2,000
2,153,880
Municipal Electric Authority of Georgia, RB
 
Series A, 5.00%, 01/01/49
 
5,235
5,386,685
Series A, 5.00%, 07/01/52
 
2,765
2,916,683
 
 
21,955,502
Idaho — 0.3%
Idaho Health Facilities Authority, Refunding RB,
3.50%, 09/01/33
 
375
346,939
Idaho Housing & Finance Association, RB(b)
 
Series A, 6.00%, 07/01/39
 
370
382,574
Series A, 6.00%, 07/01/49
 
595
607,920
Series A, 6.00%, 07/01/54
 
570
582,258
Series A, 6.95%, 06/15/55
 
1,540
1,653,595
Series C, 5.00%, 12/01/46
 
1,000
1,000,883
Power County Industrial Development Corp., RB,
6.45%, 08/01/32
 
265
265,618
 
 
4,839,787
Illinois — 2.9%
Chicago Board of Education, GO
 
Series A, 5.00%, 12/01/42
 
4,650
4,651,373
Series D, 5.00%, 12/01/46
 
6,770
6,826,743
Chicago Board of Education, Refunding GO
 
Series B, 4.00%, 12/01/35
 
655
650,457
Series B, 4.00%, 12/01/41
 
4,905
4,635,421
Chicago Transit Authority Sales Tax Receipts Fund,
Refunding RB, Series A, 2nd Lien, 5.00%,
12/01/57
 
5,550
5,798,955
City of Chicago Illinois, Refunding GO, Series B,
4.00%, 01/01/37
 
6,469
6,444,998
Illinois Finance Authority, Refunding RB
 
6.00%, 02/01/34
 
335
335,174
6.13%, 02/01/45
 
600
600,235
Series A, 5.00%, 05/15/56
 
815
744,588
Illinois State Toll Highway Authority, RB, Series A,
5.00%, 01/01/46
 
4,640
5,036,556
Metropolitan Pier & Exposition Authority, Refunding
RB, 4.00%, 06/15/50
 
9,695
9,233,844
State of Illinois, GO, 5.50%, 05/01/39
 
2,460
2,715,990
 
 
47,674,334
Indiana — 0.5%
City of Valparaiso Indiana, Refunding RB, AMT,
4.50%, 01/01/34(b)
 
665
692,705
City of Vincennes Indiana, Refunding RB, 6.25%,
01/01/29(b)(g)(h)
 
2,325
1,615,875
Indiana Finance Authority, RB, Series A, AMT, 6.75%,
05/01/39
 
2,785
3,123,039
Schedule of Investments
5

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Indiana (continued)
Indiana Finance Authority, Refunding RB, Series A,
5.50%, 09/15/44
$
1,445
$ 1,575,399
Indianapolis Local Public Improvement Bond Bank,
RB, Series E, 6.00%, 03/01/53
 
1,850
2,071,048
 
 
9,078,066
Iowa — 0.1%
Iowa Higher Education Loan Authority, Refunding RB,
5.50%, 11/01/51
 
1,000
948,302
Kansas(b) — 0.2%
City of Shawnee Kansas, RB
 
5.00%, 08/01/41
 
770
777,109
5.00%, 08/01/56
 
1,900
1,851,525
 
 
2,628,634
Kentucky — 0.7%
City of Henderson Kentucky, RB(b)
 
Series A, AMT, 4.70%, 01/01/52
 
2,435
2,436,980
Series B, AMT, 4.45%, 01/01/42
 
2,540
2,456,004
Series B, AMT, 4.70%, 01/01/52
 
6,000
6,005,447
Kentucky Economic Development Finance Authority,
Refunding RB, CAB, Series B, 0.00%, 10/01/24(d)
 
250
249,980
 
 
11,148,411
Louisiana — 1.0%
Louisiana Public Facilities Authority, RB
 
Series A, 5.25%, 06/01/51(b)
 
1,830
1,652,949
Series A, 5.25%, 06/01/60(b)
 
3,385
3,019,064
Series A, 6.50%, 06/01/62(b)
 
855
878,212
AMT, 5.50%, 09/01/59
 
4,910
5,376,369
Class R2, AMT, 6.50%, 10/01/53(a)(b)
 
2,160
2,309,657
Parish of St. James Louisiana, RB, Series 2, 6.35%,
07/01/40(b)
 
3,160
3,474,682
 
 
16,710,933
Maine — 1.0%
Finance Authority of Maine, RB, AMT, Sustainability
Bonds, 8.00%, 12/01/51(b)
 
5,600
2,209,096
Maine Health & Higher Educational Facilities
Authority, RB, Series A, 4.00%, 07/01/50
 
7,490
7,086,062
Maine Health & Higher Educational Facilities
Authority, Refunding RB, 4.00%, 07/01/37(b)
 
8,100
7,427,166
 
 
16,722,324
Maryland — 0.9%
City of Baltimore Maryland, RB
 
4.88%, 06/01/42
 
260
263,707
5.00%, 06/01/51
 
780
785,169
City of Baltimore Maryland, Refunding RB,
Convertible, 5.00%, 09/01/46
 
1,500
1,499,699
Maryland Economic Development Corp., TA, 4.00%,
09/01/50
 
4,805
4,416,141
Maryland Health & Higher Educational Facilities
Authority, RB, 7.00%, 03/01/55(b)
 
8,165
8,562,004
 
 
15,526,720
Massachusetts — 0.5%
Massachusetts Development Finance Agency, RB,
Series D, Sustainability Bonds, 4.00%, 07/01/45
 
715
672,586
Security
 
Par
(000)
Value
Massachusetts (continued)
Massachusetts Development Finance Agency,
Refunding RB(b)
 
4.13%, 10/01/42
$
855
$ 811,211
5.00%, 10/01/57
 
1,900
1,901,826
Massachusetts Port Authority, ARB, Series E, AMT,
5.00%, 07/01/51
 
4,415
4,636,543
 
 
8,022,166
Michigan — 0.4%
Advanced Technology Academy, Refunding RB
 
3.50%, 11/01/24
 
65
64,947
5.00%, 11/01/44
 
160
161,595
Michigan Strategic Fund, RB
 
5.00%, 11/15/42
 
280
281,374
AMT, 5.00%, 12/31/43
 
2,030
2,084,034
AMT, Sustainability Bonds, 4.00%, 10/01/61(a)
 
4,450
4,460,996
 
 
7,052,946
Minnesota — 0.3%
Duluth Economic Development Authority, Refunding
RB
 
Series A, 4.25%, 02/15/48
 
1,925
1,928,162
Series A, 5.25%, 02/15/58
 
2,790
2,865,745
 
 
4,793,907
Missouri — 0.4%
Industrial Development Authority of the City of St.
Louis Missouri, Refunding RB
 
Series A, 4.88%, 06/15/34
 
450
463,387
Series A, 4.38%, 11/15/35
 
1,020
900,091
Series A, 5.75%, 06/15/54
 
1,665
1,738,226
Kansas City Industrial Development Authority, RB
 
5.00%, 06/01/46(b)
 
965
976,472
5.00%, 06/01/54(b)
 
625
627,013
Series C, 7.50%, 11/15/46
 
425
358,218
Kansas City Industrial Development Authority,
Refunding RB
 
Class B, 5.00%, 11/15/46
 
772
621,799
Class D, 2.00%, 11/15/46
 
344
15,334
Kansas City Land Clearance Redevelopment
Authority, TA, Series B, 5.00%, 02/01/40(b)
 
1,240
1,244,768
 
 
6,945,308
Nebraska — 0.3%
Central Plains Energy Projects, RB, Series 1, 5.00%,
05/01/53
 
4,545
4,840,925
Nevada — 0.5%
City of Las Vegas Nevada Special Improvement
District No. 613, SAB
 
5.00%, 12/01/39
 
300
310,778
5.25%, 12/01/47
 
440
451,745
5.50%, 12/01/53
 
250
258,627
City of Las Vegas NevadaSpecial Improvement
District No. 815, SAB, 5.00%, 12/01/49
 
785
783,898
State of Nevada Department of Business & Industry,
RB, Series A4, AMT, 8.13%, 01/01/50(a)
 
2,790
2,839,277
6

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Nevada (continued)
Tahoe-Douglas Visitors Authority, RB
 
5.00%, 07/01/40
$
1,490
$ 1,564,891
5.00%, 07/01/45
 
1,460
1,516,164
 
 
7,725,380
New Hampshire — 1.2%
New Hampshire Business Finance Authority, RB
 
5.25%, 12/01/35(b)
 
6,250
6,260,004
5.38%, 12/15/35(b)
 
6,015
6,030,088
Series A, 4.13%, 08/15/40
 
1,435
1,326,351
Series A, 4.25%, 08/15/46
 
1,610
1,424,326
Series A, 4.50%, 08/15/55
 
3,350
2,937,139
New Hampshire Business Finance Authority, RB, M/F
Housing, Series 2, Sustainability Bonds, 4.25%,
07/20/41
 
2,452
2,465,377
 
 
20,443,285
New Jersey — 1.0%
Industrial Pollution Control Financing Authority of
Gloucester County, Refunding RB, Series A, AMT,
5.00%, 12/01/24(i)
 
170
170,430
New Jersey Economic Development Authority, RB
 
5.00%, 12/15/28(f)
 
2,060
2,263,213
Series A, 5.00%, 07/01/37
 
375
378,468
Series A, 5.25%, 11/01/54(b)
 
3,955
3,711,767
Series B, 6.50%, 04/01/31
 
2,010
2,092,490
New Jersey Health Care Facilities Financing
Authority, RB, 4.00%, 07/01/51
 
1,960
1,942,003
New Jersey Higher Education Student Assistance
Authority, RB, Series B, AMT, 4.25%, 12/01/45
 
1,030
1,069,237
New Jersey Transportation Trust Fund Authority, RB,
Series AA, 4.00%, 06/15/50
 
3,000
2,956,814
Tobacco Settlement Financing Corp., Refunding RB,
Sub-Series B, 5.00%, 06/01/46
 
2,000
2,013,858
 
 
16,598,280
New York — 6.5%
Albany Capital Resource Corp., Refunding RB,
4.00%, 07/01/41(g)(h)
 
3,750
2,025,000
Build NYC Resource Corp., RB
 
Series A, 5.00%, 07/01/32
 
2,255
2,231,448
Series A, 5.13%, 07/01/33
 
620
653,106
Series A, 6.13%, 07/01/43
 
1,780
1,931,059
Series A, 6.38%, 07/01/53
 
3,260
3,460,168
Build NYC Resource Corp., Refunding RB, AMT,
5.00%, 01/01/35(b)
 
2,165
2,166,910
City of New York, GO, Series A-1, 4.00%, 09/01/46
 
3,825
3,785,854
Huntington Local Development Corp., RB, Series A,
5.25%, 07/01/56
 
585
519,837
New York City Housing Development Corp., RB, M/F
Housing
 
Series C-1A, 4.15%, 11/01/39
 
3,105
3,104,988
Series C-1A, 4.20%, 11/01/44
 
3,190
3,190,126
Series C-1A, 4.30%, 11/01/47
 
4,655
4,595,122
New York Liberty Development Corp., Refunding RB
 
3.25%, 09/15/52
 
4,045
3,165,473
Series 1, 2.75%, 02/15/44
 
14,320
11,170,140
Series A, Sustainability Bonds, 3.00%, 11/15/51
 
2,300
1,818,736
New York State Dormitory Authority, Refunding RB,
Series A, 3.00%, 03/15/51
 
4,200
3,360,002
New York Transportation Development Corp., ARB
 
AMT, 5.00%, 01/01/25
 
1,000
1,002,951
AMT, 5.00%, 12/01/35
 
10,000
10,790,053
Security
 
Par
(000)
Value
New York (continued)
New York Transportation Development Corp.,
ARB(continued)
 
AMT, 5.63%, 04/01/40
$
2,215
$ 2,408,168
New York Transportation Development Corp., RB
 
AMT, 5.00%, 10/01/35
 
3,845
4,049,774
AMT, 4.00%, 04/30/53
 
2,220
1,950,839
AMT, Sustainability Bonds, 5.50%, 06/30/54
 
7,750
8,341,093
New York Transportation Development Corp.,
Refunding ARB, Series A, AMT, 5.38%, 08/01/36
 
3,665
3,944,519
Oneida Indian Nation of New York, RB, Series B,
6.00%, 09/01/43(b)
 
1,140
1,260,736
Port Authority of New York & New Jersey, Refunding
ARB, Series 223, AMT, 4.00%, 07/15/61
 
10,000
9,301,327
Suffolk Regional Off-Track Betting Co., RB
 
5.00%, 12/01/34
 
1,570
1,612,444
5.75%, 12/01/44
 
2,600
2,696,163
6.00%, 12/01/53
 
3,800
3,969,548
Westchester County Local Development Corp.,
Refunding RB
 
5.00%, 07/01/41(b)
 
3,300
3,395,740
5.00%, 07/01/46(b)
 
2,205
2,248,778
Series A, 5.13%, 07/01/55
 
1,100
897,803
Westchester Tobacco Asset Securitization Corp.,
Refunding RB
 
Sub-Series C, 4.00%, 06/01/42
 
670
625,036
Sub-Series C, 5.13%, 06/01/51
 
2,000
1,954,273
 
 
107,627,214
North Carolina — 0.0%
North Carolina Medical Care Commission, RB,
Series A, 4.00%, 10/01/35
 
350
355,684
North Dakota — 0.2%
City of Grand Forks North Dakota, RB, Series A,
(AGM), 5.00%, 12/01/48
 
1,765
1,907,366
County of Cass North Dakota, Refunding RB,
Series B, 5.25%, 02/15/58
 
1,785
1,841,507
 
 
3,748,873
Ohio — 2.4%
Buckeye Tobacco Settlement Financing Authority,
Refunding RB, Series B-2, Class 2, 5.00%,
06/01/55
 
18,695
17,558,032
County of Hamilton Ohio, Refunding RB, 5.00%,
01/01/46
 
1,435
1,441,558
County of Hardin Ohio, Refunding RB
 
5.00%, 05/01/30
 
620
622,764
5.25%, 05/01/40
 
615
615,131
5.50%, 05/01/50
 
2,895
2,858,603
Hickory Chase Community Authority, Refunding RB,
5.00%, 12/01/40(b)
 
4,840
4,709,870
Jefferson County Port Authority, RB, AMT, 3.50%,
12/01/51(b)
 
4,125
3,280,767
Ohio Air Quality Development Authority, RB, AMT,
5.00%, 07/01/49(b)
 
3,900
3,854,877
Ohio Higher Educational Facility Commission,
Refunding RB, 4.00%, 10/01/47
 
3,500
3,256,884
Port of Greater Cincinnati Development Authority, RB,
4.25%, 12/01/50(b)
 
1,065
1,009,210
 
 
39,207,696
Schedule of Investments
7

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Oklahoma — 1.3%
Oklahoma Development Finance Authority, RB
 
7.25%, 09/01/51(b)
$
14,215
$ 14,557,983
Series A-2, 7.25%, 09/01/51(b)
 
1,920
1,966,762
Series B, 5.50%, 08/15/52
 
2,415
2,498,137
Tulsa Authority for Economic Opportunity, TA, 4.38%,
12/01/41(b)
 
1,165
1,147,733
Tulsa County Industrial Authority, Refunding RB,
5.25%, 11/15/37
 
1,050
1,072,537
 
 
21,243,152
Oregon — 0.1%
Clackamas County Hospital Facility Authority,
Refunding RB, Series A, 5.25%, 11/15/50
 
800
800,943
Oregon State Facilities Authority, RB(b)
 
Series A, 5.00%, 06/15/49
 
915
843,878
Series A, 5.25%, 06/15/55
 
505
478,499
 
 
2,123,320
Pennsylvania — 2.3%
Allentown Neighborhood Improvement Zone
Development Authority, RB(b)
 
5.00%, 05/01/42
 
8,785
9,227,237
Series A, 5.25%, 05/01/32
 
300
321,216
Series A, 5.25%, 05/01/42
 
300
309,859
Beaver County Industrial Development Authority,
Refunding RB, Series B, 3.75%, 10/01/47
 
4,065
3,631,049
Bucks County Industrial Development Authority, RB,
4.00%, 07/01/46
 
475
408,502
Doylestown Hospital Authority, Refunding RB(b)
 
5.00%, 07/01/31
 
485
513,757
5.38%, 07/01/39
 
1,125
1,247,234
Lancaster Municipal Authority, RB, Series B, 5.00%,
05/01/54
 
300
309,839
Montgomery County Higher Education and Health
Authority, Refunding RB, Series A, 4.00%,
09/01/49
 
880
830,966
Montgomery County Industrial Development Authority,
Refunding RB, 5.00%, 12/01/46
 
1,000
1,006,380
Northampton County Industrial Development
Authority, TA, 7.00%, 07/01/32
 
830
831,436
Pennsylvania Economic Development Financing
Authority, RB
 
AMT, 5.75%, 06/30/48
 
2,890
3,190,284
AMT, 5.25%, 06/30/53
 
4,830
5,095,846
Pennsylvania Economic Development Financing
Authority, Refunding RB
 
Series B, 5.25%, 12/01/38(a)
 
1,750
1,781,599
Series C, 5.25%, 12/01/37(a)
 
3,065
3,120,465
AMT, 5.50%, 11/01/44
 
5,390
5,392,809
Pennsylvania Higher Education Assistance Agency,
RB, Sub-Series 1C, AMT, 5.00%, 06/01/51
 
640
647,327
School District of Philadelphia, GOL, Series A,
(SAW), 5.50%, 09/01/48
 
490
548,151
 
 
38,413,956
Puerto Rico — 10.0%
Childrens Trust Fund, RB, Series A, 0.00%,
05/15/57(d)
 
38,360
2,628,785
Childrens Trust Fund, Refunding RB, Series B,
0.00%, 05/15/55(d)
 
2,000
225,941
Commonwealth of Puerto Rico, GO
 
Series A-1, Restructured, 5.38%, 07/01/25
 
(j)
1
Series A-1, Restructured, 5.63%, 07/01/29
 
3,605
3,911,742
Series A-1, Restructured, 5.75%, 07/01/31
 
3,402
3,799,873
Security
 
Par
(000)
Value
Puerto Rico (continued)
Commonwealth of Puerto Rico, GO(continued)
 
Series A-1, Restructured, 4.00%, 07/01/35
$
2,010
$ 1,995,425
Series A-1, Restructured, 4.00%, 07/01/37
 
4,281
4,249,158
Series A-1, Restructured, 4.00%, 07/01/41
 
4,939
4,751,599
Series A-1, Restructured, 4.00%, 07/01/46
 
2,017
1,900,946
Commonwealth of Puerto Rico, GO, CAB, Series A,
Restructured, 0.00%, 07/01/33(d)
 
5,283
3,576,554
Commonwealth of Puerto Rico, RB(a)(g)(h)
 
0.00%, 11/01/51
 
145,383
74,758,104
Series A-1, 0.00%, 11/01/43
 
1,238
795,721
PRIFA Custodial Trust, RB, Series 2005, 0.00%,
03/15/49
 
3,300
1,007,687
Puerto Rico Commonwealth Aqueduct & Sewer
Authority, RB, Series A, 4.00%, 07/01/42(b)
 
1,075
1,029,044
Puerto Rico Commonwealth Aqueduct & Sewer
Authority, Refunding RB, Series B, 4.00%,
07/01/42(b)
 
7,000
6,700,734
Puerto Rico Electric Power Authority, RB
 
Series A, 7.25%, 07/01/30(g)(h)
 
250
106,250
Series A, 7.00%, 07/01/33(g)(h)
 
8,735
3,712,375
Series A, 6.75%, 07/01/36(g)(h)
 
5,830
2,477,750
Series A, 7.00%, 07/01/40
 
1,000
425,000
Series A, 5.00%, 07/01/42(g)(h)
 
1,605
682,125
Series A, 5.05%, 07/01/42(g)(h)
 
1,080
459,000
Series A, 7.00%, 07/01/43(g)(h)
 
775
329,375
Series A-1, 10.00%, 07/01/19(g)(h)
 
230
97,840
Series A-2, 10.00%, 07/01/19(g)(h)
 
1,161
493,607
Series A-3, 10.00%, 07/01/19(g)(h)
 
748
317,759
Series B-3, 10.00%, 07/01/19(g)(h)
 
748
317,759
Series C-1, 5.40%, 01/01/18(g)(h)
 
2,054
873,025
Series C-2, 5.40%, 07/01/18(g)(h)
 
2,055
873,166
Series C-3, 5.40%, 01/01/20(g)(h)
 
208
88,263
Series C-4, 5.40%, 07/01/20(g)(h)
 
208
88,263
Series CCC, 5.00%, 07/01/22
 
715
303,875
Series CCC, 5.00%, 07/01/25
 
620
263,500
Series CCC, 5.25%, 07/01/26(g)(h)
 
590
250,750
Series CCC, 5.25%, 07/01/28(g)(h)
 
1,945
826,625
Series D-1, 7.50%, 01/01/20(g)(h)
 
2,332
991,198
Series D-2, 7.50%, 01/01/20(g)(h)
 
4,430
1,882,721
Series D-4, 7.50%, 07/01/20(g)(h)
 
709
301,434
Series TT, 5.00%, 07/01/18(g)(h)
 
900
382,500
Series TT, 5.00%, 07/01/25(g)(h)
 
3,270
1,389,750
Series TT, 5.00%, 07/01/26(g)(h)
 
455
193,375
Series WW, 5.50%, 07/01/17(g)(h)
 
475
201,875
Series WW, 5.50%, 07/01/18(g)(h)
 
415
176,375
Series WW, 5.50%, 07/01/19(g)(h)
 
335
142,375
Series WW, 5.38%, 07/01/22(g)(h)
 
4,500
1,912,500
Series WW, 5.38%, 07/01/24(g)(h)
 
815
346,375
Series WW, 5.25%, 07/01/25
 
1,940
824,500
Series WW, 5.25%, 07/01/33(g)(h)
 
315
133,875
Series WW, 5.50%, 07/01/38(g)(h)
 
415
176,375
Series XX, 5.25%, 07/01/17(g)(h)
 
230
97,750
Series XX, 5.25%, 07/01/35(g)(h)
 
705
299,625
Series XX, 5.75%, 07/01/36(g)(h)
 
2,870
1,219,750
Series XX, 5.25%, 07/01/40(g)(h)
 
8,385
3,563,625
Puerto Rico Electric Power Authority, Refunding RB
 
Series AAA, 5.25%, 07/01/22(g)(h)
 
765
325,125
Series AAA, 5.25%, 07/01/25
 
3,560
1,513,000
Series AAA, 5.25%, 07/01/28(g)(h)
 
3,655
1,553,375
Series AAA, 5.25%, 07/01/29(g)(h)
 
190
80,750
Series UU, 0.00%, 07/01/17(a)(g)(h)
 
2,660
1,130,500
Series UU, 0.00%, 07/01/18(a)(g)(h)
 
125
53,125
Series UU, 0.00%, 07/01/20(a)(g)(h)
 
1,135
482,375
8

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Puerto Rico (continued)
Puerto Rico Electric Power Authority, Refunding
RB(continued)
 
Series UU, 4.45%, 07/01/31(a)(g)(h)
$
1,345
$ 571,625
Series ZZ, 5.25%, 07/01/19(g)(h)
 
1,050
446,250
Series ZZ, 5.25%, 07/01/23(g)(h)
 
370
157,250
Series ZZ, 5.25%, 07/01/24(g)(h)
 
5,050
2,146,250
Series ZZ, 5.25%, 07/01/25(g)(h)
 
265
112,625
Series ZZ, 5.00%, 07/01/28(g)(h)
 
345
146,625
Series ZZ, 5.00%, 12/29/49(g)(h)
 
330
140,250
Puerto Rico Industrial Tourist Educational Medical &
Envirml Ctl Facs Fing Authority, ARB
 
Series A-1, AMT, 6.75%, 01/01/45
 
680
812,974
Series A-2, AMT, 6.50%, 01/01/42
 
445
530,511
Series A-2, AMT, 6.75%, 01/01/45
 
680
812,970
Puerto Rico Sales Tax Financing Corp. Sales Tax
Revenue, RB
 
Series A-1, Restructured, 5.00%, 07/01/58
 
7,000
7,066,272
Series A-2, Restructured, 4.54%, 07/01/53
 
1,564
1,527,017
Puerto Rico Sales Tax Financing Corp. Sales Tax
Revenue, RB, CAB(d)
 
Series A-1, Restructured, 0.00%, 07/01/33
 
2,574
1,828,293
Series A-1, Restructured, 0.00%, 07/01/51
 
18,000
4,407,316
Series B-1, Restructured, 0.00%, 07/01/46
 
8,066
2,713,371
 
 
167,111,448
South Carolina — 0.6%
City of Hardeeville South Carolina, SAB(b)
 
3.00%, 05/01/27
 
180
173,004
3.50%, 05/01/32
 
235
213,973
3.88%, 05/01/41
 
560
476,652
4.00%, 05/01/52
 
465
360,798
County of Dorchester South Carolina, SAB, 6.00%,
10/01/51(b)
 
2,240
2,303,368
South Carolina Jobs-Economic Development
Authority, RB
 
7.50%, 08/15/62(b)
 
1,935
1,938,876
Series A, 5.50%, 11/01/54
 
3,945
4,414,454
South Carolina Jobs-Economic Development
Authority, Refunding RB, 4.00%, 11/15/27
 
300
298,028
 
 
10,179,153
Tennessee — 1.3%
Metropolitan Government Nashville & Davidson
County Health & Educational Facilities Board,
Refunding RB, 4.00%, 10/01/49
 
1,635
1,388,618
Metropolitan Government Nashville & Davidson
County Industrial Development Board, SAB,
4.00%, 06/01/51(b)
 
3,445
3,073,741
Metropolitan Government Nashville & Davidson
County Industrial Development Board, SAB, CAB,
0.00%, 06/01/43(b)(d)
 
4,000
1,637,930
Nashville Metropolitan Development & Housing
Agency, TA, 5.13%, 06/01/36(b)
 
500
514,897
Tennergy Corp., RB, Series A, 5.50%, 10/01/53(a)
 
7,435
8,153,468
Tennessee Energy Acquisition Corp., RB, Series A,
5.00%, 05/01/52(a)
 
6,360
6,917,537
 
 
21,686,191
Texas — 7.6%
Angelina & Neches River Authority, RB, Series A,
AMT, 7.50%, 12/01/45(b)
 
2,340
1,675,676
Arlington Higher Education Finance Corp., RB(b)
 
5.63%, 08/15/54
 
6,260
5,205,747
7.50%, 04/01/62
 
1,970
2,032,432
Security
 
Par
(000)
Value
Texas (continued)
Arlington Higher Education Finance Corp.,
RB(b)(continued)
 
7.88%, 11/01/62
$
1,670
$ 1,758,899
Central Texas Regional Mobility Authority, Refunding
RB(d)
 
0.00%, 01/01/28
 
3,000
2,724,219
0.00%, 01/01/29
 
500
438,830
0.00%, 01/01/30
 
1,330
1,126,533
0.00%, 01/01/31
 
4,000
3,262,660
City of Anna Texas, SAB(b)
 
4.88%, 09/15/31
 
202
205,578
5.50%, 09/15/44
 
769
786,628
5.75%, 09/15/54
 
195
199,434
City of Crandall Texas, SAB(b)
 
4.00%, 09/15/31
 
200
198,155
4.75%, 09/15/31
 
100
102,084
4.25%, 09/15/41
 
770
738,624
5.00%, 09/15/41
 
500
510,141
City of Fate Texas, SAB, 5.75%, 08/15/54(b)
 
290
303,653
City of Houston Texas Airport System Revenue, ARB
 
AMT, 5.00%, 07/15/28
 
6,685
6,959,415
Series A, AMT, 6.63%, 07/15/38
 
1,110
1,112,128
Series A, AMT, 4.00%, 07/01/41
 
3,600
3,503,427
Series B-1, AMT, 5.00%, 07/15/35
 
5,000
5,034,996
City of Houston Texas Airport System Revenue,
Refunding ARB, AMT, 5.00%, 07/15/27
 
615
635,042
City of Houston Texas Airport System Revenue,
Refunding RB
 
AMT, 5.00%, 07/01/29
 
6,600
6,605,407
Series C, AMT, 5.00%, 07/15/27
 
5,525
5,702,654
City of Marble Falls Texas, SAB(b)
 
4.63%, 09/01/31
 
100
100,936
4.88%, 09/01/41
 
295
296,540
6.38%, 09/01/44
 
180
180,874
5.13%, 09/01/51
 
500
498,809
6.63%, 09/01/54
 
1,140
1,144,073
City of Oak Point Texas, SAB(b)
 
4.25%, 09/01/31
 
150
150,414
4.38%, 09/01/31
 
150
150,601
09/15/31(c)
 
300
299,516
5.00%, 09/01/44
 
350
351,814
5.13%, 09/01/44
 
425
427,601
09/15/44(c)
 
500
500,158
5.25%, 09/01/54
 
575
577,285
5.38%, 09/01/54
 
642
645,421
09/15/54(c)
 
230
227,447
5.63%, 09/15/54
 
1,000
1,006,071
City of San Marcos Texas, SAB(b)
 
3.75%, 09/01/27
 
156
155,790
4.00%, 09/01/32
 
237
235,877
4.25%, 09/01/42
 
750
723,292
4.50%, 09/01/51
 
520
491,220
Clifton Higher Education Finance Corp., RB, Series A,
6.00%, 06/15/54(b)
 
200
201,694
Fort Bend County Industrial Development Corp., RB,
Series B, 4.75%, 11/01/42
 
1,380
1,380,326
Harris County Cultural Education Facilities Finance
Corp., Refunding RB
 
Series A, 5.00%, 01/01/38
 
510
510,105
Series A, 5.00%, 01/01/43
 
520
520,052
Series A, 5.13%, 01/01/48
 
1,535
1,535,092
Hemphill County Hospital District, GOL
 
4.63%, 02/01/39
 
1,500
1,487,661
Schedule of Investments
9

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Texas (continued)
Hemphill County Hospital District, GOL(continued)
 
4.75%, 02/01/45
$
2,500
$ 2,465,981
Houston Higher Education Finance Corp., RB, 4.00%,
10/01/51
 
1,400
1,184,903
New Hope Cultural Education Facilities Finance
Corp., RB
 
Series A, 5.00%, 01/01/55
 
700
579,161
Series A, 5.00%, 07/01/57
 
3,000
2,278,830
New Hope Cultural Education Facilities Finance
Corp., Refunding RB, Series A, 6.75%, 10/01/52
 
5,000
4,967,902
New Hope Higher Education Finance Corp., RB,
Series A, 5.75%, 06/15/51(b)
 
5,580
5,239,997
Newark Higher Education Finance Corp., RB(b)
 
Series A, 5.50%, 08/15/35
 
375
379,049
Series A, 5.75%, 08/15/45
 
735
746,134
Port of Beaumont Navigation District, ARB(b)
 
Series A, AMT, 5.00%, 01/01/39
 
21,345
22,322,237
Series A, AMT, 5.13%, 01/01/44
 
4,535
4,682,231
Port of Beaumont Navigation District, RB, AMT,
2.88%, 01/01/41(b)
 
2,050
1,689,311
Port of Beaumont Navigation District, Refunding RB(b)
 
Series A, AMT, 3.63%, 01/01/35
 
3,580
3,390,236
Series A, AMT, 4.00%, 01/01/50
 
1,155
1,040,683
San Antonio Education Facilities Corp., RB
 
Series A, 5.00%, 10/01/41
 
645
592,023
Series A, 5.00%, 10/01/51
 
885
756,179
Texas Municipal Gas Acquisition & Supply Corp. III,
Refunding RB, 5.00%, 12/15/32
 
1,500
1,633,474
Texas Transportation Commission State Highway
249 System, RB, CAB(d)
 
0.00%, 08/01/46
 
2,580
908,523
0.00%, 08/01/47
 
3,850
1,284,359
0.00%, 08/01/48
 
4,070
1,288,284
0.00%, 08/01/49
 
3,825
1,148,145
0.00%, 08/01/50
 
5,485
1,552,452
0.00%, 08/01/51
 
3,230
864,129
0.00%, 08/01/52
 
3,230
815,718
0.00%, 08/01/53
 
290
69,303
 
 
126,500,275
Utah — 1.0%
Black Desert Public Infrastructure District, SAB,
5.63%, 12/01/53(b)
 
1,475
1,529,725
County of Utah, RB, Series A, 3.00%, 05/15/50
 
940
736,510
Utah Charter School Finance Authority, RB, Series A,
5.00%, 06/15/52(b)
 
1,320
1,184,493
Utah Housing Corp., RB, S/F Housing
 
Series A, (GNMA), 4.50%, 01/21/49
 
1,105
1,084,705
Series B, (GNMA), 4.50%, 02/21/49
 
1,793
1,757,753
Series C, (GNMA), 4.50%, 03/21/49
 
958
919,584
Series D, (GNMA), 4.50%, 04/21/49
 
2,011
1,970,671
Series E, (GNMA), 4.50%, 05/21/49
 
1,302
1,275,992
Series F-G2, (GNMA), 4.50%, 06/21/49
 
2,263
2,246,555
Series G-G2, (GNMA), 4.50%, 07/21/49
 
1,343
1,316,358
Series H, (GNMA), 4.50%, 08/21/49
 
1,162
1,138,927
Series I, (GNMA), 4.50%, 11/21/48
 
641
628,507
Security
 
Par
(000)
Value
Utah (continued)
Utah Housing Corp., RB, S/F Housing(continued)
 
Series J, (GNMA), 4.50%, 12/21/48
$
890
$ 872,943
Wood Ranch Public Infrastructure District, SAB,
5.63%, 12/01/53(b)
 
485
506,055
 
 
17,168,778
Vermont(b) — 0.7%
East Central Vermont Telecommunications District,
RB
 
Series A, 4.75%, 12/01/40
 
2,850
2,644,671
Series A, 4.50%, 12/01/44
 
3,695
3,186,762
Series A, 6.88%, 12/01/46
 
3,630
3,963,030
Series A, 4.50%, 12/01/50
 
3,000
2,442,078
 
 
12,236,541
Virginia — 1.4%
Ballston Quarter Community Development Authority,
TA, Series A-1, 5.50%, 03/01/46
 
1,154
1,122,934
Ballston Quarter Community Development Authority,
TA, CAB, Series A-2, 7.13%, 03/01/59(e)
 
2,770
2,027,622
Hanover County Economic Development Authority,
Refunding RB, 4.00%, 07/01/40(b)
 
1,790
1,617,469
James City County Economic Development Authority,
RB
 
Series A, 6.88%, 12/01/58
 
1,475
1,634,602
Series C3, 5.25%, 12/01/27
 
990
991,919
Lower Magnolia Green Community Development
Authority, SAB(b)
 
5.00%, 03/01/35
 
460
463,717
5.00%, 03/01/45
 
475
471,797
Norfolk Economic Development Authority, Refunding
RB, Series B, 4.00%, 11/01/48
 
10,745
10,560,853
Norfolk Redevelopment & Housing Authority, RB
 
Series A, 5.00%, 01/01/49
 
1,250
1,185,912
Series B, 4.00%, 01/01/25
 
65
64,940
Virginia Beach Development Authority, RB
 
Series A, 7.00%, 09/01/53
 
1,800
2,080,112
Series B3, 5.38%, 09/01/29
 
1,085
1,116,280
 
 
23,338,157
Washington — 0.9%
Washington Economic Development Finance
Authority, RB, Series A, AMT, Sustainability Bonds,
5.63%, 12/01/40(b)
 
3,470
3,584,194
Washington State Housing Finance Commission, RB
 
3.95%, 07/01/29(b)
 
2,830
2,713,826
5.75%, 01/01/53(b)
 
720
715,972
5.88%, 01/01/59(b)
 
585
585,461
6.00%, 07/01/59
 
300
307,958
Series A, 5.00%, 07/01/50(b)
 
1,240
1,232,241
Washington State Housing Finance Commission,
Refunding RB
 
5.00%, 01/01/26(b)
 
900
900,714
5.75%, 01/01/35(b)
 
355
354,950
5.00%, 01/01/43(b)
 
2,000
1,895,430
6.00%, 01/01/45(b)
 
940
941,186
Series A, 5.00%, 07/01/43
 
920
979,425
Series A, 5.00%, 07/01/48
 
620
649,406
 
 
14,860,763
10

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
(Percentages shown are based on Net Assets)
Security
 
Par
(000)
Value
Wisconsin — 6.7%
Public Finance Authority, ARB
 
AMT, 4.00%, 07/01/41
$
530
$ 471,039
AMT, 4.25%, 07/01/54
 
3,690
3,160,525
Public Finance Authority, RB
 
6.25%, 10/01/31(b)(g)(h)
 
910
77,350
5.50%, 12/15/32(b)
 
6,785
6,929,317
5.75%, 12/15/33(b)
 
12,185
12,192,276
5.00%, 06/15/41(b)
 
925
932,578
12/15/44(b)(c)
 
410
418,602
7.00%, 10/01/47(b)(g)(h)
 
910
77,350
5.63%, 06/15/49(b)
 
5,925
5,455,942
5.00%, 06/15/53
 
645
652,817
12/15/54(b)(c)
 
1,190
1,209,111
5.00%, 06/15/55(b)
 
2,405
2,388,459
5.00%, 01/01/56(b)
 
3,790
3,466,014
Series A, 12.00%, 05/16/29(b)
 
1,895
1,937,894
Series A, 4.25%, 06/15/31(b)
 
170
167,817
Series A, 5.00%, 06/01/40(b)
 
750
708,500
Series A, 5.00%, 06/15/41(b)
 
510
513,520
Series A, 7.75%, 07/01/43(b)
 
9,100
9,607,755
Series A, 6.85%, 11/01/46(b)(g)(h)
 
1,325
640,969
Series A, 7.00%, 11/01/46(b)(g)(h)
 
805
389,419
Series A, 5.38%, 07/15/47(b)
 
1,595
1,616,691
Series A, 5.00%, 06/01/49(b)
 
1,340
1,193,452
Series A, 5.63%, 06/15/49(b)
 
7,850
7,690,337
Series A, 5.00%, 06/15/51(b)
 
1,060
1,053,954
Series A, 5.25%, 12/01/51(b)
 
5,280
3,778,427
Series A, 5.00%, 06/15/55(b)
 
11,540
9,933,779
Series A, 4.75%, 06/15/56(b)
 
2,395
1,774,651
Series A, 7.50%, 07/01/59(b)
 
7,880
8,777,224
Series A-1, 4.50%, 01/01/35(b)
 
845
853,290
Series A-4, 5.50%, 11/15/32(b)
 
6,435
6,584,924
Series B, 0.00%, 01/01/35(b)(d)
 
1,050
575,166
Series B, 0.00%, 01/01/60(b)(d)
 
31,635
2,629,281
AMT, Sustainability Bonds, 4.00%, 09/30/51
 
4,000
3,511,388
AMT, Sustainability Bonds, 4.00%, 03/31/56
 
3,370
2,926,482
Public Finance Authority, Refunding RB(b)
 
5.00%, 05/15/32
 
980
991,215
5.00%, 03/01/52
 
1,300
1,210,126
Wisconsin Health & Educational Facilities Authority,
RB, Series A, 5.75%, 08/15/54
 
1,375
1,475,878
Wisconsin Health & Educational Facilities Authority,
Refunding RB, 4.00%, 01/01/47
 
2,540
2,288,557
Wisconsin Housing & Economic Development
Authority, RB, M/F Housing, Series A, 4.70%,
07/01/47
 
740
745,338
 
 
111,007,414
Total Municipal Bonds — 94.6%
(Cost: $1,580,583,807)
1,573,025,969
Municipal Bonds Transferred to Tender Option Bond Trusts(k)
New York — 0.7%
Triborough Bridge & Tunnel Authority, Refunding RB,
Sub-Series B-1, Senior Lien, 5.00%, 05/15/56
 
12,000
12,442,569
Security
 
Par
(000)
Value
Pennsylvania — 0.8%
Pennsylvania Housing Finance Agency, RB, S/F
Housing, Series 143A, Sustainability Bonds,
5.45%, 04/01/51
$
12,495
$    13,586,977
Total Municipal Bonds Transferred to Tender Option Bond
Trusts — 1.5%
(Cost: $24,695,497)
26,029,546
Total Long-Term Investments — 96.1%
(Cost: $1,605,279,304)
1,599,055,515
 
 

Shares
 
Short-Term Securities
Money Market Funds — 4.0%
BlackRock Liquidity Funds, MuniCash, Institutional
Shares, 3.05%(l)(m)
 
65,963,842
65,970,438
Total Short-Term Securities — 4.0%
(Cost: $65,963,366)
65,970,438
Total Investments — 100.1%
(Cost: $1,671,242,670)
1,665,025,953
Other Assets Less Liabilities — 0.9%
14,428,174
Liability for TOBTrust Certificates, Including Interest Expense and
Fees Payable — (1.0)%
(16,466,612
)
Net Assets — 100.0%
$ 1,662,987,515
(a)
Variable rate security. Interest rate resets periodically. The rate shown is the effective
interest rate as of period end. Security description also includes the reference rate and
spread if published and available.
(b)
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.
(c)
When-issued security.
(d)
Zero-coupon bond.
(e)
Step coupon security. Coupon rate will either increase (step-up bond) or decrease (step-
down bond) at regular intervals until maturity. Interest rate shown reflects the rate
currently in effect.
(f)
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.
(g)
Issuer filed for bankruptcy and/or is in default.
(h)
Non-income producing security.
(i)
Security is collateralized by municipal bonds or U.S. Treasury obligations.
(j)
Rounds to less than 1,000.
(k)
Represent bonds transferred to a TOB Trust in exchange of cash and residual certificates
received by the Fund. These bonds serve as collateral in a secured borrowing.
(l)
Affiliate of the Fund.
(m)
Annualized 7-day yield as of period end.
Schedule of Investments
11

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
Affiliates
Investments in issuers considered to be affiliate(s) of the Fund during the period ended September 30, 2024 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:
Affiliated Issuer
Value at
06/30/24
Purchases
at Cost
Proceeds
from Sales
Net
Realized
Gain (Loss)
Change in
Unrealized
Appreciation
(Depreciation)
Value at
09/30/24
Shares
Held at
09/30/24
Income
Capital Gain
Distributions
from
Underlying
Funds
BlackRock Liquidity Funds, MuniCash, Institutional
Shares
$ 95,556,313
$ 
$ (29,585,875
)(a)
$ 
$ 
$ 65,970,438
65,963,842
$ 669,113
$ 
(a)
Represents net amount purchased (sold).
Fair Value Hierarchy as of Period End
Various inputs are used in determining the fair value of financial instruments at the measurement date. 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 that the Fund has the ability to access for identical, unrestricted assets or liabilities;
Level 2 – Inputs other than quoted prices included within level 1 that are observable for the asset or liability, either directly or indirectly; and
Level 3 – Inputs that are unobservable and significant to the  entire fair value measurement for the asset or liability (including the Valuation Committee’s assumptions used in determining the fair value of financial instruments).
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 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 financial instruments is based on the pricing transparency of the financial instruments and is not necessarily an indication of the risks associated with investing in those securities.
The following table summarizes the Fund’s financial instruments categorized in the fair value hierarchy.  The breakdown of the Funds financial instruments into major categories is disclosed in the Schedule of Investments above.
 
Level 1
Level 2
Level 3
Total
Assets
Investments
Long-Term Investments
Municipal Bonds
$ 
$ 1,573,025,969
$ 
$ 1,573,025,969
Municipal Bonds Transferred to Tender Option Bond Trusts
26,029,546
26,029,546
Short-Term Securities
Money Market Funds
65,970,438
65,970,438
Unfunded Commitments(a)
7,184,477
7,184,477
$ 65,970,438
$ 1,599,055,515
$ 7,184,477
$ 1,672,210,430
(a)
Unfunded commitments are valued at the unrealized appreciation (depreciation) on the commitment.
The Fund may hold assets and/or liabilities in which the fair value approximates the carrying amount for financial reporting purposes. As of period end, TOB Trust Certificates of $16,330,000 are categorized as Level 2 within the fair value hierarchy.
Portfolio Abbreviation 
AGC
Assured Guaranty Corp.
AGM
Assured Guaranty Municipal Corp.
AMT
Alternative Minimum Tax
ARB
Airport Revenue Bonds
Portfolio Abbreviation (continued)
BAM-TCRS
Build America Mutual Assurance Co. - Transferable
Custodial Receipts
CAB
Capital Appreciation Bonds
GNMA
Government National Mortgage Association
GO
General Obligation Bonds
12

Schedule of Investments (unaudited)(continued)
September 30, 2024
BlackRock High Yield Municipal Fund
Portfolio Abbreviation (continued)
GOL
General Obligation Ltd.
M/F
Multi-Family
RB
Revenue Bond
S/F
Single-Family
SAB
Special Assessment Bonds
SAW
State Aid Withholding
ST
Special Tax
TA
Tax Allocation
Schedule of Investments
13