1
Portfolio
of
Investments
December
31,
2024
NBB
(Unaudited)
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
LONG-TERM
INVESTMENTS
-
144.7%
(99.3%
of
Total
Investments)
685005459
MUNICIPAL
BONDS
-
144.7%
(99.3%
of
Total
Investments)
685005459
ALABAMA
-
0.9%
(0.6%
of
Total
Investments)
$
4,000,000
Homewood
Educational
Building
Authority,
Alabama,
Revenue
Bonds,
CHF-Horizons
II,
LLC
Student
Housing
and
Parking
Project
at
Samford
University
Taxable
Series
2024D
7.423
%
10/01/44
$
4,146,312
TOTAL
ALABAMA
4,146,312
ALASKA
-
0.7%
(0.5%
of
Total
Investments)
3,025,000
Port
Lions,
Alaska,
Revenue
Bonds,
Kodiak
Area
Native
Association
Project,
Taxable
Series
2022
7.500
10/01/52
3,163,405
TOTAL
ALASKA
3,163,405
ARIZONA
-
0.4%
(0.3%
of
Total
Investments)
2,000,000
(a)
Maricopa
County
Industrial
Development
Authority,
Arizona,
Education
Revenue
Bonds,
Grand
Canyon
University
Project,
Taxable
Series
2024
7.375
10/01/29
2,040,083
TOTAL
ARIZONA
2,040,083
CALIFORNIA
-
27.4%
(18.8%
of
Total
Investments)
1,680,000
ABAG
Finance
Authority
for
Non-Profit
Corporations,
California,
Special
Tax
Bonds,
Community
Facilities
District
2004-1
Seismic
Safety
Improvements
690
&
942
Market
Street
Project,
Taxable
Refunding
Series
2018
5.100
09/01/28
1,642,828
6,125,000
ABAG
Finance
Authority
for
Non-Profit
Corporations,
California,
Special
Tax
Bonds,
Community
Facilities
District
2004-1
Seismic
Safety
Improvements
690
&
942
Market
Street
Project,
Taxable
Refunding
Series
2018
5.500
09/01/38
5,559,994
5,500,000
Alameda
Corridor
Transportation
Authority,
California,
Revenue
Bonds,
Taxable
Refunding
Subordinate
Lien
Series
2024
-
AGM
Insured
0.000
10/01/39
2,327,852
1,000,000
California
Infrastructure
and
Economic
Development
Bank,
Revenue
Bonds,
J.
David
Gladstone
Institutes
Project,
Taxable
Series
2019
3.550
10/01/34
850,847
1,500,000
California
Infrastructure
and
Economic
Development
Bank,
Revenue
Bonds,
J.
David
Gladstone
Institutes
Project,
Taxable
Series
2019
4.000
10/01/39
1,198,163
8,260,000
California
Infrastructure
and
Economic
Development
Bank,
Revenue
Bonds,
J.
David
Gladstone
Institutes
Project,
Taxable
Series
2019
4.658
10/01/59
6,194,466
1,000,000
California
Infrastructure
and
Economic
Development
Bank,
Revenue
Bonds,
University
of
California
San
Francisco
Neurosciences
Building,
Build
America
Taxable
Bond
Series
2010B
6.486
05/15/49
1,063,691
8,010,000
(a)
California
Municipal
Finance
Authority,
Mobile
Home
Park
Revenue
Bonds,
Windsor
Mobile
Country
Club,
Taxable
Refunding
Series
20202B
6.375
11/15/48
7,622,437
540,000
(a)
California
Public
Finance
Authority,
University
Housing
Revenue
Bonds,
National
Campus
Community
Development
-
Claremont
Properties
LLC
Claremont
Colleges
Project,
Taxable
Refunding
Series
2023B
6.500
07/01/32
531,708
4,530,000
(b)
California
State
Public
Works
Board,
Lease
Revenue
Bonds,
Various
Capital
Projects,
Build
America
Taxable
Bond
Series
2009G-2
8.361
10/01/34
5,315,705
7,010,000
California
State
University,
Systemwide
Revenue
Bonds,
Build
America
Taxable
Bond
Series
2010B
6.484
11/01/41
7,409,753
2,000,000
California
State,
General
Obligation
Bonds,
Build
America
Federally
Taxable
Series
2009
7.550
04/01/39
2,367,166
4,110,000
(b)
California
State,
General
Obligation
Bonds,
Various
Purpose,
Build
America
Taxable
Bond
Series
2010
7.600
11/01/40
4,899,938
2,000,000
(a)
California
Statewide
Communities
Development
Authority,
Limited
Obligation
Improvement
Bonds,
300
Lakeside
Drive
Oakland
Property
Assessed
Clean
Energy,
Taxable
Sustainability
Green
Series
2023
8.000
09/02/53
2,070,378
Portfolio
of
Investments
December
31,
2024
(continued)
NBB
2
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
CALIFORNIA
(continued)
$
1,250,000
California
Statewide
Communities
Development
Authority,
Revenue
Bonds,
Front
Porch
Communities
&
Services,
Taxable
Series
2021B
2.240
%
04/01/31
$
1,049,080
1,280,000
California
Statewide
Community
Development
Authority,
Health
Revenue
Bonds,
Enloe
Medical
Center,
Refunding
Series
2022B
-
AGM
Insured
7.140
08/15/47
1,351,762
2,025,000
Chino
Public
Financing
Authority,
California,
Local
Agency
Bonds,
Refunding
Series
2021A
4.001
09/01/38
1,745,411
1,000,000
Golden
State
Tobacco
Securitization
Corporation,
California,
Enhanced
Tobacco
Settlement
Asset-Backed
Revenue
Bonds,
Taxable
Series
2021B
3.293
06/01/42
753,021
2,000,000
Golden
State
Tobacco
Securitization
Corporation,
California,
Tobacco
Settlement
Asset-Backed
Bonds,
Taxable
Senior
Series
2021A-1
3.714
06/01/41
1,543,343
7,500,000
(b)
Los
Angeles
Community
College
District,
California,
General
Obligation
Bonds,
Build
America
Taxable
Bonds,
Series
2010
6.600
08/01/42
8,115,215
10,000,000
(c)
Los
Angeles
Community
College
District,
California,
General
Obligation
Bonds,
Build
America
Taxable
Bonds,
Series
2010,
(UB)
6.600
08/01/42
10,820,286
2,000,000
(a),(c)
Los
Angeles
Community
College
District,
Los
Angeles
County,
California,
General
Obligation
Bonds,
Tender
Option
Bond
Trust
2016-XTG002,
Formerly
Tender
Option
Bond
Trust
TN027,
(IF)
13.439
08/01/49
3,139,689
1,880,000
(b)
Los
Angeles
County
Public
Works
Financing
Authority,
California,
Lease
Revenue
Bonds,
Mulitple
Capital
Projects
I,
Build
America
Taxable
Bond
Series
2010B
7.488
08/01/33
2,034,562
11,380,000
(b)
Los
Angeles
County
Public
Works
Financing
Authority,
California,
Lease
Revenue
Bonds,
Mulitple
Capital
Projects
I,
Build
America
Taxable
Bond
Series
2010B
7.618
08/01/40
13,267,708
2,960,000
Los
Angeles
Department
of
Airports,
California,
Revenue
Bonds,
Los
Angeles
International
Airport,
Build
America
Taxable
Bonds,
Series
2009C
6.582
05/15/39
3,131,230
1,785,000
(b)
Los
Angeles
Department
of
Water
and
Power,
California,
Power
System
Revenue
Bonds,
Federally
Taxable
-
Direct
Payment
-
Build
America
Bonds,
Series
2010D
6.574
07/01/45
1,937,202
4,000,000
(a),(c)
Los
Angeles
Department
of
Water
and
Power,
California,
Water
System
Revenue
Bonds,
Tender
Option
Bond
Trust
2016-XFT906,
(IF)
12.125
07/01/50
6,049,360
4,180,000
(b)
Sacramento
Public
Financing
Authority,
California,
Lease
Revenue
Bonds,
Golden
1
Center,
Series
2015
5.637
04/01/50
4,243,551
2,200,000
San
Diego
County
Regional
Transportation
Commission,
California,
Sales
Tax
Revenue
Bonds,
Build
America
Taxable
Bonds
Series
2010A
5.911
04/01/48
2,234,975
1,500,000
San
Francisco
City
and
County
Public
Utilities
Commission,
California,
Water
Revenue
Bonds,
Taxable
Build
America
Bond
Series
2010G
6.950
11/01/50
1,662,282
1,000,000
San
Francisco
City
and
County
Redevelopment
Financing
Authority,
California,
Tax
Allocation
Revenue
Bonds,
San
Francisco
Redevelopment
Projects,
Taxable
Series
2009E
8.406
08/01/39
1,194,329
4,000,000
(a),(c)
San
Francisco
City
and
County,
California,
Certificates
of
Participation,
525
Golden
Gate
Avenue,
San
Francisco
Public
Utilities
Commission
Office
Project,
Tender
Option
Bond
2016-
XFT901,
Formerly
Tender
Option
Bond
Trust
B001,
(IF)
11.960
11/01/41
5,384,116
2,000,000
(a),(c)
San
Francisco
City
and
County,
California,
Certificates
of
Participation,
525
Golden
Gate
Avenue,
San
Francisco
Public
Utilities
Commission
Office
Project,
Tender
Option
Bond
2016-
XFT901,
Formerly
Tender
Option
Bond
Trust
B001,
(IF)
11.960
11/01/41
2,692,058
1,185,000
(a)
San
Francisco
City
and
County,
California,
Development
Special
Tax
Bonds,
Mission
Rock
Facilities
and
Services
Special
Tax
District
2020-1,
Taxable
Series
2021B
4.000
09/01/31
1,103,886
2,000,000
(b)
University
of
California
Regents,
Medical
Center
Pooled
Revenue
Bonds,
Taxable
Build
America
Bond
Series
2010H
6.548
05/15/48
2,150,337
4,260,000
Vernon,
California,
Electric
System
Revenue
Bonds,
Series
2008A
8.590
07/01/38
4,993,368
TOTAL
CALIFORNIA
129,651,697
3
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
COLORADO
-
0.9%
(0.6%
of
Total
Investments)
$
3,030,000
(b)
Denver
School
District
1,
Colorado,
General
Obligation
Bonds,
Build
America
Taxable
Bonds,
Series
2009C
5.664
%
12/01/33
$
3,058,918
1,230,000
(b)
Regional
Transportation
District,
Colorado,
Sales
Tax
Revenue
Bonds,
Fastracks
Project,
Build
America
Series
2010B
5.844
11/01/50
1,247,244
TOTAL
COLORADO
4,306,162
DISTRICT
OF
COLUMBIA
-
3.9%
(2.6%
of
Total
Investments)
14,365,000
(b)
Metropolitan
Washington
Airports
Authority,
Virginia,
Dulles
Toll
Road
Revenue
Bonds,
Dulles
Metrorail
&
Capital
improvement
Projects,
Second
Senior
Lien,
Build
America
Bond
Series
2009D
7.462
10/01/46
17,034,164
1,000,000
Metropolitan
Washington
Airports
Authority,
Virginia,
Dulles
Toll
Road
Revenue
Bonds,
Dulles
Metrorail
&
Capital
improvement
Projects,
Second
Senior
Lien,
Build
America
Bond
Series
2009D
-
AGM
Insured
7.462
10/01/46
1,211,316
TOTAL
DISTRICT
OF
COLUMBIA
18,245,480
FLORIDA
-
4.5%
(3.1%
of
Total
Investments)
14,655,000
(a)
Charlotte
County
Industrial
Development
Authority,
Florida,
Utility
System
Revenue
Bonds,
Town
&
Country
Utilities
Project,
Taxable
Series
2021B
5.000
10/01/36
12,984,775
1,400,000
(a)
Miami,
Florida,
Special
Obligation
Revenue
Bonds,
Street
&
Sidewalk
Improvement
Program,
Taxable
Refunding
Series
2018B
-
AGM
Insured
4.808
01/01/39
1,290,353
6,570,000
Miami-Dade
County,
Florida,
Seaport
Revenue
Bonds,
Taxable
Series
2023
6.224
11/01/55
6,813,886
TOTAL
FLORIDA
21,089,014
GEORGIA
-
7.5%
(5.1%
of
Total
Investments)
2,264,000
Georgia
Municipal
Electric
Authority,
Plant
Vogtle
Units
3
&
4
Project
M
Bonds,
Taxable
Build
America
Bonds
Series
2010A
6.655
04/01/57
2,431,682
5,668,000
Georgia
Municipal
Electric
Authority,
Plant
Vogtle
Units
3
&
4
Project
P
Bonds,
Refunding
Taxable
Build
America
Bonds
Series
2010A
-
AGM
Insured
7.055
04/01/57
6,407,342
19,222,000
(b)
Georgia
Municipal
Electric
Authority,
Plant
Vogtle
Units
3
&
4
Project
P
Bonds,
Refunding
Taxable
Build
America
Bonds
Series
2010A
7.055
04/01/57
21,096,660
5,012,000
Municipal
Electric
Authority
of
Georgia,
Plant
Vogtle
Units
3
&
4
Project
J
Bonds,
Taxable
Build
America
Bonds
Series
2010A
6.637
04/01/57
5,354,083
TOTAL
GEORGIA
35,289,767
ILLINOIS
-
12.8%
(8.8%
of
Total
Investments)
2,210,000
Bellwood
Illinois,
Tax
Increment
Revenue
Bonds,
Senior
Apartments
Project,
Series
2022
6.000
12/01/50
2,072,954
4,030,000
(b)
Chicago
Board
of
Education,
Illinois,
General
Obligation
Bonds,
Dedicated
Revenues,
Series
2010C
-
BAM
Insured
6.319
11/01/29
4,130,013
12,715,000
(b)
Chicago
Transit
Authority,
Illinois,
Sales
Tax
Receipts
Revenue
Bonds,
Federally
Taxable
Build
America
Bonds,
Series
2010B
6.200
12/01/40
13,069,848
355,000
Chicago,
Illinois,
General
Airport
Revenue
Bonds,
O'Hare
International
Airport,
Third
Lien,
Taxable
Build
America
Bond
Series
2010B
6.395
01/01/40
373,577
1,000,000
Chicago,
Illinois,
General
Obligation
Bonds,
Taxable
Project,
Build
America
Bonds
-
Direct
Payment,
Series
2010B
-
BAM
Insured
7.517
01/01/40
1,139,697
1,935,000
Chicago,
Illinois,
Wastewater
Transmission
Revenue
Bonds,
Build
America
Taxable
Bond
Series
2010B
6.900
01/01/40
2,092,446
3,495,000
Chicago,
Illinois,
Water
Revenue
Bonds,
Taxable
Second
Lien
Series
2010B
6.742
11/01/40
3,749,430
1,950,000
Cook
County,
Illinois,
General
Obligation
Bonds,
Build
America
Taxable
Bonds,
Series
2010D
6.229
11/15/34
2,029,021
2,770,000
(a)
Illinois
International
Port
District,
Revenue
Bonds,
Taxable
Refunding
Series
2020
5.000
01/01/35
2,499,070
1,571,429
Illinois
State,
General
Obligation
Bonds,
Build
America
Taxable
Bonds,
Series
2010-5
7.350
07/01/35
1,676,463
11,875,769
(b)
Illinois
State,
General
Obligation
Bonds,
Taxable
Build
America
Bonds,
Series
2010-3
6.725
04/01/35
12,361,861
10,312,000
(b)
Illinois
Toll
Highway
Authority,
Toll
Highway
Revenue
Bonds,
Taxable
Build
America
Bond
Senior
Lien
Series
2009A
6.184
01/01/34
10,746,382
Portfolio
of
Investments
December
31,
2024
(continued)
NBB
4
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
ILLINOIS
(continued)
$
2,420,000
(b)
Illinois
Toll
Highway
Authority,
Toll
Highway
Revenue
Bonds,
Taxable
Build
America
Bond
Senior
Lien
Series
2009B
5.851
%
12/01/34
$
2,458,943
380,000
Northern
Illinois
Municipal
Power
Agency,  Power
Project
Revenue
Bonds,
Prairie
State
Project,
Build
America
Bond
Series
2009C
6.859
01/01/39
402,931
1,375,000
Northern
Illinois
Municipal
Power
Agency,  Power
Project
Revenue
Bonds,
Prairie
State
Project,
Build
America
Taxable
Bond
Series
2010A
7.820
01/01/40
1,590,774
TOTAL
ILLINOIS
60,393,410
INDIANA
-
1.2%
(0.8%
of
Total
Investments)
1,000,000
Indianapolis
Local
Public
Improvement
Bond
Bank,
Indiana,
Build
America
Taxable
Bonds,
Series
2010B-2
6.116
01/15/40
1,027,418
5,000,000
Knox
County,
Indiana,
Economic
Development
Revenue
Bonds,
Good
Samaritan
Hospital
Project,
Taxable
Series
2012B
5.900
04/01/34
4,839,343
TOTAL
INDIANA
5,866,761
KENTUCKY
-
1.6%
(1.1%
of
Total
Investments)
5,000
Kentucky
Municipal
Power
Agency,
Power
System
Revenue
Bonds,
Prairie
State
Project,
Build
America
Bond
Series
2010B
-
AGM
Insured
6.490
09/01/37
5,002
5,450,000
(b)
Louisville
and
Jefferson
County
Metropolitan
Sewer
District,
Kentucky,
Sewer
and
Drainage
System
Revenue
Bonds,
Build
America
Taxable
Bonds
Series
2010A
6.250
05/15/43
5,666,459
2,080,000
Newport,
Kentucky,
Industrial
Building
Revenue
Bonds,
South
Beach
1,
LLC
Project,
Taxable
Refunding
Series
2022
4.125
03/01/33
1,892,267
TOTAL
KENTUCKY
7,563,728
LOUISIANA
-
0.1%
(0.0%
of
Total
Investments)
500,000
Shreveport,
Louisiana,
Water
and
Sewer
Revenue
Bonds,
Refunding
Junior
Lien
Series
2020C
4.210
12/01/44
381,362
TOTAL
LOUISIANA
381,362
MARYLAND
-
3.4%
(2.4%
of
Total
Investments)
3,500,000
Maryland
Economic
Development
Corporation,
Economic
Development
Revenue
Bonds,
Terminal
Project,
Refunding
Series
2017B
4.550
06/01/35
3,198,155
1,000,000
Maryland
Economic
Development
Corporation,
Economic
Development
Revenue
Bonds,
Terminal
Project,
Series
2019B
4.750
06/01/42
866,321
1,500,000
Maryland
Economic
Development
Corporation,
Parking
Facilities
Revenue
Bonds
Baltimore
City
Project,
Senior
Parking
Facilities
Revenue,
Series
2018B
4.580
06/01/33
1,404,498
2,945,000
Maryland
Economic
Development
Corporation,
Parking
Facilities
Revenue
Bonds
Baltimore
City
Project,
Senior
Parking
Facilities
Revenue,
Series
2018B
4.790
06/01/38
2,597,868
4,285,000
Maryland
Economic
Development
Corporation,
Parking
Facilities
Revenue
Bonds
Baltimore
City
Project,
Senior
Parking
Facilities
Revenue,
Series
2018B
5.050
06/01/43
3,670,068
5,350,000
Maryland
Economic
Development
Corporation,
Parking
Facilities
Revenue
Bonds
Baltimore
City
Project,
Senior
Parking
Facilities
Revenue,
Series
2018B
5.320
06/01/51
4,520,349
TOTAL
MARYLAND
16,257,259
MASSACHUSETTS
-
0.8%
(0.6%
of
Total
Investments)
4,000,000
(a),(c)
Massachusetts,
Transporation
Fund
Revenue
Bonds,
Accelerated
Bridge
Program,
Tender
Option
Bond
Trust
2016-XFT907,
(IF)
8.096
06/01/40
3,992,610
TOTAL
MASSACHUSETTS
3,992,610
MINNESOTA
-
0.4%
(0.3%
of
Total
Investments)
1,855,000
Western
Minnesota
Municipal
Power
Agency,
Minnesota,
Power
Supply
Revenue
Bonds,
Build
America
Taxable
Bond
Series
2010C
6.770
01/01/46
2,030,786
TOTAL
MINNESOTA
2,030,786
MISSISSIPPI
-
0.4%
(0.3%
of
Total
Investments)
2,085,000
Mississippi
State,
General
Obligation
Bonds,
Taxable
Build
America
Bond
Series
2010F
5.245
11/01/34
2,065,605
TOTAL
MISSISSIPPI
2,065,605
5
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
MISSOURI
-
0.2%
(0.2%
of
Total
Investments)
$
1,000,000
Missouri
Joint
Municipal
Electric
Utility
Commission,
Power
Project
Revenue
Bonds,
Pairie
State
Power
Project,
Federally
Taxable
Build
America
Bonds
-
Direct
Pay,
Series
2009A
6.890
%
01/01/42
$
1,085,700
TOTAL
MISSOURI
1,085,700
NEW
HAMPSHIRE
-
1.0%
(0.7%
of
Total
Investments)
4,500,000
(a)
National
Finance
Authority,
New
Hampshire,
Utility
Revenue
Bonds,
Wheeling
Power
Company
Project,
Taxable
Refunding
Series
2024A
6.890
04/01/34
4,564,639
TOTAL
NEW
HAMPSHIRE
4,564,639
NEW
JERSEY
-
4.1%
(2.8%
of
Total
Investments)
3,320,000
New
Jersey
Educational
Facilities
Authority,
Revenue
Bonds,
Seton
Hall
University,
Taxable
Series
2020D
-
AGM
Insured
3.958
07/01/48
2,621,154
3,000,000
New
Jersey
Turnpike
Authority,
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
2009F
7.414
01/01/40
3,440,361
8,805,000
New
Jersey
Turnpike
Authority,
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
2010A
7.102
01/01/41
9,843,530
2,000,000
Rutgers
State
University,
New
Jersey,
Revenue
Bonds,
Taxable
Build
America
Bond
Series
2010H
5.665
05/01/40
1,989,248
870,000
South
Jersey
Port
Corporation,
New
Jersey,
Marine
Terminal
Revenue
Bonds,
Taxable
Build
America
Bond
Series
2009P-3
7.365
01/01/40
956,022
530,000
South
Jersey
Transportation
Authority,
New
Jersey,
Transportation
System
Revenue
Bonds,
Build
America
Bond
Series
2009A-5
7.000
11/01/38
570,459
TOTAL
NEW
JERSEY
19,420,774
NEW
YORK
-
25.6%
(17.6%
of
Total
Investments)
420,000
Babylon
Local
Development
Corporation
II,
New
York,
Education
Revenue
Bonds,
The
Academy
Charter
School
Project,
Taxable
Series
2023B
7.250
02/01/27
422,783
10,000,000
Dormitory
Authority
of
the
State
of
New
York,
Revenue
Bonds,
Montefiore
Obligated
Group,
Taxable
Series
2018B
5.096
08/01/34
9,346,675
1,415,000
Dormitory
Authority
of
the
State
of
New
York,
Revenue
Bonds,
Montefiore
Obligated
Group,
Taxable
Series
2018B
-
AGM
Insured
4.946
08/01/48
1,245,242
25,000,000
Dormitory
Authority
of
the
State
of
New
York,
State
Personal
Income
Tax
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
2010D,
(UB)
5.600
03/15/40
24,829,312
2,000,000
(a)
Dormitory
Authority
of
the
State
of
New
York,
State
Personal
Income
Tax
Revenue
Bonds,
Tender
Option
Bond
Trust
30020,
(IF)
7.666
03/15/40
1,931,725
5,100,000
(b)
Long
Island
Power
Authority,
New
York,
Electric
System
Revenue
Bonds,
Build
America
Taxable
Bond
Series
2010B
5.850
05/01/41
5,104,985
595,000
Metropolitan
Transportation
Authority,
New
York,
Dedicated
Tax
Fund
Bonds,
Build
America
Taxable
Bonds,
Series
2010C
7.336
11/15/39
696,335
2,085,000
Metropolitan
Transportation
Authority,
New
York,
Transportation
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
2010B-1
6.548
11/15/31
2,184,349
10,925,000
(b)
Metropolitan
Transportation
Authority,
New
York,
Transportation
Revenue
Bonds,
Federally
Taxable
Build
America
Bonds,
Series
2010E
6.814
11/15/40
11,733,460
11,390,000
(b)
Metropolitan
Transportation
Authority,
New
York,
Transportation
Revenue
Bonds,
Federally
Taxable
Issuer
Subsidy
Build
America
Bonds,
Series
2010A
6.668
11/15/39
12,158,896
440,000
Metropolitan
Transportation
Authority,
New
York,
Transportation
Revenue
Bonds,
Taxable
Green
Climate
Certified
Series
2020C-2
5.175
11/15/49
378,427
3,675,000
Monroe
County
Industrial
Development
Corporation,
New
York,
Revenue
Bonds,
Rochester
Regional
Health
Project,
Taxable
Series
2020B
4.600
12/01/46
2,922,644
870,000
(a)
New
York
City
Industrial
Development
Agency,
New
York,
Installment
Purchase
and
Lease
Revenue
Bonds,
Queens
Baseball
Stadium
Project,
Series
2006
-
AMBAC
Insured
6.027
01/01/46
876,842
1,900,000
New
York
City
Industrial
Development
Agency,
New
York,
Installment
Purchase
and
Lease
Revenue
Bonds,
Queens
Baseball
Stadium
Project,
Series
2006
-
AGM
Insured
6.027
01/01/46
1,925,191
Portfolio
of
Investments
December
31,
2024
(continued)
NBB
6
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
NEW
YORK
(continued)
$
475,000
(a)
New
York
City
Industrial
Development
Authority,
New
York,
Rental
Revenue
Bonds,
Yankee
Stadium
Project,
Taxable
Series
2009
-
AGM
Insured
11.000
%
03/01/29
$
531,844
1,500,000
(b)
New
York
City
Municipal
Water
Finance
Authority,
New
York,
Water
and
Sewer
System
Revenue
Bonds,
Second
Generation
Resolution,
Build
America
Taxable
Bonds,
Fiscal
2011
Series
AA
5.440
06/15/43
1,420,835
2,595,000
New
York
City
Municipal
Water
Finance
Authority,
New
York,
Water
and
Sewer
System
Revenue
Bonds,
Second
Generation
Resolution,
Build
America
Taxable
Bonds,
Series
2010DD
5.952
06/15/42
2,615,696
2,025,000
(c)
New
York
City
Municipal
Water
Finance
Authority,
New
York,
Water
and
Sewer
System
Revenue
Bonds,
Second
Generation
Resolution,
Build
America
Taxable
Bonds,
Series
2010DD,
(UB)
5.952
06/15/42
2,041,150
3,595,000
(a),(c)
New
York
City
Municipal
Water
Finance
Authority,
New
York,
Water
and
Sewer
System
Revenue
Bonds,
Second
Generation
Resolution,
Taxable
Tender
Option
Bonds
Trust
T30001-2,
(IF)
9.515
06/15/44
3,464,368
10,170,000
(b)
New
York
City
Transitional
Finance
Authority,
New
York,
Building
Aid
Revenue
Bonds,
Fiscal
2011
Taxable
Build
America
Bond
Series
2010S-1B
6.828
07/15/40
10,876,043
10,000,000
(b)
New
York
City
Transitional
Finance
Authority,
New
York,
Future
Tax
Secured
Bonds,
Build
America
Taxable
Bonds,
Series
2010G-1
5.467
05/01/40
9,749,327
3,000,000
New
York
City,
New
York,
General
Obligation
Bonds,
Taxable
Fiscal
2025
Series
D-1
5.114
10/01/54
2,842,877
3,450,000
Westchester
County
Health
Care
Corporation,
New
York,
Senior
Lien
Revenue
Bonds,  Refunding
Series
2010A
8.572
11/01/40
3,323,608
5,495,000
Westchester
County
Health
Care
Corporation,
New
York,
Senior
Lien
Revenue
Bonds,  Refunding
Series
2010A
8.572
11/01/40
5,293,098
2,970,000
Westchester
County
Health
Care
Corporation,
New
York,
Senior
Lien
Revenue
Bonds,
Series
2010-C1
-
AGM
Insured
8.572
11/01/40
3,376,203
TOTAL
NEW
YORK
121,291,915
OHIO
-
6.1%
(4.2%
of
Total
Investments)
6,350,000
(b)
American
Municipal
Power
Inc.,
Ohio,
Combined
Hydroelectric
Projects
Revenue
Bonds,
Build
America
Bond
Series
2010B
7.834
02/15/41
7,495,838
1,000,000
American
Municipal
Power
Inc.,
Ohio,
Combined
Hydroelectric
Projects
Revenue
Bonds,
Build
America
Bond
Series
2010B
8.084
02/15/50
1,262,128
1,475,000
American
Municipal
Power
Inc.,
Ohio,
Meldahl
Hydroelectric
Projects
Revenue
Bonds,
Build
America
Bond
Series
2010B
7.499
02/15/50
1,716,305
7,040,000
American
Municipal
Power
Ohio
Inc.,
Prairie
State
Energy
Campus
Project
Revenue
Bonds,
Build
America
Bond
Series
2009C
6.053
02/15/43
7,161,105
2,300,000
Columbus
Regional
Airport
Authority,
Ohio,
Customer
Facility
Charge
Revenue
Bonds,
Taxable
Series
2019
4.199
12/15/48
1,860,983
10,575,000
Port
of
Greater
Cincinnati
Development
Authority,
Ohio,
Special
Obligation
Tax
Increment
Financing
Revenue
Bonds,
Cooperative
Township
Public
Parking
Project,
Kenwood
Collection
Redevelopment,
Refunding
Senior
Lien
Series
2016A
6.600
01/01/39
9,447,928
TOTAL
OHIO
28,944,287
OKLAHOMA
-
3.9%
(2.7%
of
Total
Investments)
19,200,000
Oklahoma
Development
Finance
Authority,
Health
System
Revenue
Bonds,
OU
Medicine
Project,
Taxable
Series
2018D
5.450
08/15/28
18,474,835
TOTAL
OKLAHOMA
18,474,835
OREGON
-
1.1%
(0.7%
of
Total
Investments)
1,590,000
Hillsboro
Economic
Development
Council,
Oregon,
Tax
Increment
Revenue
Bonds,
North
Hillsboro
Industrial
Renew
Area,
Taxable
Series
2024
-
AGM
Insured
5.815
06/01/38
1,604,017
1,600,000
Hillsboro
Economic
Development
Council,
Oregon,
Tax
Increment
Revenue
Bonds,
North
Hillsboro
Industrial
Renew
Area,
Taxable
Series
2024
-
AGM
Insured
5.865
06/01/39
1,613,791
2,450,000
Port
of
Portland,
Oregon,
Portland
International
Airport
Customer
Facility
Charge
Revenue
Bonds,
Taxable
Series
2019
4.237
07/01/49
1,942,164
TOTAL
OREGON
5,159,972
7
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
PENNSYLVANIA
-
1.5%
(1.0%
of
Total
Investments)
$
1,915,000
Commonwealth
Financing
Authority,
Pennsylvania,
State
Appropriation
Lease
Bonds,
Build
America
Taxable
Bonds,
Series
2009D
6.218
%
06/01/39
$
1,994,788
215,000
Pennsylvania
Higher
Educational
Facilities
Authority,
Revenue
Bonds,
Thomas
Jefferson
University,
Taxable
Series
2024C
5.362
11/01/37
210,568
1,640,000
Pennsylvania
Turnpike
Commission,
Turnpike
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
2009A
6.105
12/01/39
1,718,899
2,715,000
(b)
Pennsylvania
Turnpike
Commission,
Turnpike
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
2010B
5.511
12/01/45
2,633,707
305,000
Philadelphia
Redevelopment
Authority,
Pennsylvania,
City
Service
Agreement
Revenue
Bonds,
City
of
Philadelphia
Neighborhood
Preservation
Initiative,
Taxable
Social
Series
2024A
5.226
09/01/40
296,179
TOTAL
PENNSYLVANIA
6,854,141
SOUTH
CAROLINA
-
3.4%
(2.4%
of
Total
Investments)
2,000,000
South
Carolina
Public
Service
Authority,
Electric
System
Revenue
Bonds,
Santee
Cooper,
Federally
Taxable
Build
America
Series
2010C
-
AGM
Insured
6.454
01/01/50
2,150,691
1,550,000
South
Carolina
Public
Service
Authority,
Electric
System
Revenue
Bonds,
Santee
Cooper,
Federally
Taxable
Build
America
Series
2010C
6.454
01/01/50
1,652,665
8,985,000
South
Carolina
Public
Service
Authority,
Electric
System
Revenue
Bonds,
Santee
Cooper,
Federally
Taxable
Build
America
Series
2010C,
(UB)
6.454
01/01/50
9,580,124
205,000
(a)
South
Carolina
Public
Service
Authority,
Electric
System
Revenue
Bonds,
Santee
Cooper,
Federally
Taxable
Build
America
Tender
Option
Bond
Trust
T30002,
(IF)
11.440
01/01/50
272,891
2,585,000
South
Carolina
Public
Service
Authority,
Santee
Cooper
Revenue
Obligations,
Refunding
Series
2013C
-
AGM
Insured
5.784
12/01/41
2,638,585
TOTAL
SOUTH
CAROLINA
16,294,956
TENNESSEE
-
4.9%
(3.3%
of
Total
Investments)
1,500,000
Jackson,
Tennessee,
Hospital
Revenue
Bonds,
Jackson-Madison
County
General
Hospital
Project,
Series
2018B
5.308
04/01/48
1,369,488
415,000
Memphis/Shelby
County
Economic
Development
Growth
Engine
Industrial
Development
Board,
Tennessee,
Tax
Increment
Revenue
Bonds,
Graceland
Project,
Senior
Taxable
Series
2017B
4.700
07/01/27
396,623
7,915,000
Memphis/Shelby
County
Economic
Development
Growth
Engine
Industrial
Development
Board,
Tennessee,
Tax
Increment
Revenue
Bonds,
Graceland
Project,
Senior
Taxable
Series
2017B
5.200
07/01/37
6,630,184
1,515,000
Memphis/Shelby
County
Economic
Development
Growth
Engine
Industrial
Development
Board,
Tennessee,
Tax
Increment
Revenue
Bonds,
Graceland
Project,
Senior
Taxable
Series
2017B
5.450
07/01/45
1,136,056
5,010,000
(b)
Metropolitan
Government
Nashville
&
Davidson
County
Convention
Center
Authority,
Tennessee,
Tourism
Tax
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
2010A-2
7.431
07/01/43
5,750,871
7,350,000
(b)
Metropolitan
Government
Nashville
&
Davidson
County
Convention
Center
Authority,
Tennessee,
Tourism
Tax
Revenue
Bonds,
Build
America
Taxable
Bonds,
Subordinate
Lien
Series
2010B
6.731
07/01/43
7,845,822
TOTAL
TENNESSEE
23,129,044
TEXAS
-
10.0%
(6.8%
of
Total
Investments)
2,520,000
Dallas
Area
Rapid
Transit,
Texas,
Sales
Tax
Revenue
Bonds,
Taxable
Build
America
Bonds,
Series
2009B
5.999
12/01/44
2,564,013
16,460,000
(b)
Dallas
Convention
Center
Hotel
Development
Corporation,
Texas,
Hotel
Revenue
Bonds,
Build
America
Taxable
Bonds,
Series
09B
7.088
01/01/42
18,126,574
1,000,000
Fort
Worth,
Tarrant,
Denton,
Parker,
Johnson,
and
Wise
Counties,
Texas,
Special
Tax
Revenue
Bonds,
Taxable
Series
2017B
4.238
03/01/47
826,531
1,500,000
Greater
Texas
Cultural
Educational
Facilities
Finance
Corporation,
Texas,
Revenue
Bonds,
Biomedical
Research
Institute
Taxable
Series
2024B
6.250
06/01/37
1,462,027
665,000
Harris
County,
Texas,
Hotel
Occupancy
Tax
Revenue
Bonds,
Senior
Lien
Taxable
Series
2024
5.363
08/15/49
637,606
Portfolio
of
Investments
December
31,
2024
(continued)
NBB
8
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
TEXAS
(continued)
$
10,285,000
(b)
North
Texas
Tollway
Authority,
System
Revenue
Bonds,
Taxble
Build
America
Bond
Series
2009B
6.718
%
01/01/49
$
11,445,842
7,545,000
San
Antonio,
Texas,
Customer
Facility
Charge
Revenue
Bonds,
Rental
Car
Special
Facilities
Project,
Series
2015
5.671
07/01/35
7,526,282
2,000,000
San
Antonio,
Texas,
Customer
Facility
Charge
Revenue
Bonds,
Rental
Car
Special
Facilities
Project,
Series
2015
5.871
07/01/45
1,915,171
1,000,000
San
Antonio,
Texas,
Electric
and
Gas
System
Revenue
Bonds,
Junior
Lien,
Build
America
Taxable
Bond
Series
2010A
5.808
02/01/41
1,002,055
10,000
San
Antonio,
Texas,
Electric
and
Gas
System
Revenue
Bonds,
Series
2012
4.427
02/01/42
9,224
1,400,000
Tarrant
County
Cultural
Education
Facilities
Finance
Corporation,
Texas,
Hospital
Revenue
Bonds,
Hendrick
Medical
Center,
Taxable
Series
2021
-
AGM
Insured
3.422
09/01/50
973,036
1,000,000
Texas
Private
Activity
Bond
Surface
Transporation
Corporation,
Revenue
Bonds,
NTE
Mobility
Partners
LLC
North
Tarrant
Express
Managed
Lanes
Project,
Taxable
Refunding
Senior
Lien
Series
2019B
3.922
12/31/49
792,404
TOTAL
TEXAS
47,280,765
UTAH
-
1.5%
(1.1%
of
Total
Investments)
8,500,000
(a)
Salt
Lake
County,
Utah,
Convention
Hotel
Revenue
Bonds,
Taxable
Series
2019
5.750
10/01/47
7,310,327
TOTAL
UTAH
7,310,327
VIRGINIA
-
3.3%
(2.2%
of
Total
Investments)
1,840,000
(a)
Fredericksburg
Economic
Development
Authority,
Virginia,
Revenue
Bonds,
Fredericksburg
Stadium
Project,
Taxable
Series
2019A
5.500
09/01/49
1,704,742
10,380,000
Tobacco
Settlement
Financing
Corporation
of
Virginia,
Tobacco
Settlement
Asset
Backed
Bonds,
Refunding
Senior
Lien
Series
2007A
6.706
06/01/46
8,698,010
5,055,000
(a)
Virginia
Small
Business
Finance
Authority,
Tourism
Development
Financing
Program
Revenue
Bonds,
Downtown
Norfolk
and
Virginia
Beach
Oceanfront
Hotel
Projects,
Series
2018B
12.000
04/01/48
5,050,439
TOTAL
VIRGINIA
15,453,191
WASHINGTON
-
7.1%
(4.9%
of
Total
Investments)
4,000,000
(a),(c)
Seattle,
Washington,
Municipal
Light
and
Power
Revenue
Bonds,
Federally
Taxable
Build
America
Bonds,
Tender
Option
Bond
Trust
2016-XFT905,
Formerly
Tender
Option
Bond
Trust
T0001,
(IF)
7.015
02/01/40
3,908,280
28,300,000
(b)
Washington
State
Convention
Center
Public
Facilities
District,
Lodging
Tax
Revenue
Bonds,
Build
America
Taxable
Bond
Series
2010B
6.790
07/01/40
29,686,046
TOTAL
WASHINGTON
33,594,326
WEST
VIRGINIA
-
3.1%
(2.1%
of
Total
Investments)
8,500,000
Tobacco
Settlement
Finance
Authority,
West
Virginia,
Tobacco
Settlement
Asset-Backed
Bonds,
Taxable
Refunding
Class
1
Senior
Series
2020A
4.006
06/01/40
6,716,528
10,800,000
Tobacco
Settlement
Finance
Authority,
West
Virginia,
Tobacco
Settlement
Asset-Backed
Bonds,
Taxable
Refunding
Class
1
Senior
Series
2020A
4.306
06/01/49
8,070,780
TOTAL
WEST
VIRGINIA
14,787,308
WISCONSIN
-
1.0%
(0.7%
of
Total
Investments)
480,000
(a)
Fond
du
Lac
County,
Wisconsin,
Revenue
Bonds,
Bug
Tussel
1
LLC
Project,
Taxable
Social
Series
2022A
-
BAM
Insured
5.569
11/01/51
431,338
2,360,000
(a)
Fond
du
Lac
County,
Wisconsin,
Revenue
Bonds,
Bug
Tussel
1
LLC
Project,
Taxable
Social
Series
2023
-
BAM
Insured
6.434
11/01/52
2,379,402
400,000
Fond
du
Lac
County,
Wisconsin,
Revenue
Bonds,
Bug
Tussel
2
LLC
Project,
Taxable
Series
2024
-
BAM
Insured
6.201
05/01/54
394,789
9
All
percentages
shown
in
the
Portfolio
of
Investments
are
based
on
net
assets
applicable
to
common
shares
unless
otherwise
noted.
Investments
in
Derivatives
Part
F
of
Form
N-PORT
was
prepared
in
accordance
with
U.S.
generally
accepted
accounting
principles
(“U.S.
GAAP”)
and
in
conformity
with
the
applicable
rules
and
regulations
of
the
U.S.
Securities
and
Exchange
Commission
(“SEC”)
related
to
interim
filings.
Part
F
of
Form
N-PORT
does
not
include
all
information
and
footnotes
required
by
U.S.
GAAP
for
complete
financial
statements.
Certain
footnote
disclosures
normally
included
in
financial
statements
prepared
in
accordance
with
U.S.
GAAP
have
been
condensed
or
omitted
from
this
report
pursuant
to
the
rules
of
the
SEC.
For
a
full
set
of
the
Fund’s
notes
to
financial
statements,
please
refer
to
the
Fund’s
most
recently
filed
annual
or
semi-annual
report.
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
WISCONSIN
(continued)
$
2,000,000
Wisconsin
Center
District,
Dedicated
Tax
Revenue
Bonds,
Supported
by
State
Moral
Obligation
Taxable
Senior
Series
2020A
-
AGM
Insured
4.473
%
12/15/47
$
1,670,309
TOTAL
WISCONSIN
4,875,838
TOTAL
MUNICIPAL
BONDS
(Cost
$731,975,530)
685,005,459
TOTAL
LONG-TERM
INVESTMENTS
(Cost
$731,975,530)
685,005,459
PRINCIPAL
DESCRIPTION
RATE
MATURITY
VALUE
SHORT-TERM
INVESTMENTS
-
 1.0%(0.7%
of
Total
Investments)
4,700,000
REPURCHASE
AGREEMENTS
-
1.0%
(0.7%
of
Total
Investments)
4,700,000
4,700,000
(d)
Fixed
Income
Clearing
Corporation
4.430
01/02/25
4,700,000
TOTAL
REPURCHASE
AGREEMENTS
(Cost
$4,700,000)
4,700,000
TOTAL
SHORT-TERM
INVESTMENTS
(Cost
$4,700,000)
4,700,000
TOTAL
INVESTMENTS
-
145.7%
(Cost
$736,675,530
)
689,705,459
FLOATING
RATE
OBLIGATIONS
-
(7.8)%
(36,810,000)
REVERSE
REPURCHASE
AGREEMENTS,
INCLUDING
ACCRUED
INTEREST
-
(41.8)%(e)
(198,018,488)
OTHER
ASSETS
&
LIABILITIES,
NET
-  3.9%
18,573,153
NET
ASSETS
APPLICABLE
TO
COMMON
SHARES
-
100%
$
473,450,124
IF
Inverse
floating
rate
security
issued
by
a
tender
option
bond
(“TOB”)
trust,
the
interest
rate
on
which
varies
inversely
with
the
Securities
Industry
Financial
Markets
Association
(SIFMA)
short-term
rate,
which
resets
weekly,
or
a
similar
short-term
rate,
and
is
reduced
by
the
expenses
related
to
the
TOB
trust.
UB
Underlying
bond
of
an
inverse
floating
rate
trust
reflected
as
a
financing
transaction.
Inverse
floating
rate
trust
is
a
Recourse
Trust
unless
otherwise
noted.
(a)
Security
is
exempt
from
registration
under
Rule
144A
of
the
Securities
Act
of
1933,
as
amended.
These
securities
are
deemed
liquid
and
may
be
resold
in
transactions
exempt
from
registration,
which
are
normally
those
transactions
with
qualified
institutional
buyers.
As
of
the
end
of
the
reporting
period,
the
aggregate
value
of
these
securities
is
$83,827,360
or
12.2%
of
Total
Investments.
(b)
Investment,
or
portion
of
investment,
has
been
pledged
to
collateralize
the
net
payment
obligations
for
investments
in
reverse
repurchase
agreements.
As
of
the
end
of
the
reporting
period,
investments
with
a
value
of
$234,300,237
have
been
pledged
as
collateral
for
reverse
repurchase
agreements.
(c)
Investment,
or
portion
of
investment,
has
been
pledged
to
collateralize
the
net
payment
obligations
for
investments
in
inverse
floating
rate
transactions.
(d)
Agreement
with
Fixed
Income
Clearing
Corporation,
4.430%
dated
12/31/24
to
be
repurchased
at
$4,701,157
on
1/2/25,
collateralized
by
Government
Agency
Securities,
with
coupon
rate
4.625%
and
maturity
date
11/15/44,
valued
at
$4,794,163.
(e)
Reverse
Repurchase
Agreements,
including
accrued
interest
as
a
percentage
of
Total
investments
is
28.7%.
Futures
Contracts
-
Short
Description
Number
of
Contracts
Expiration
Date
Notional
Amount
Value
Unrealized
Appreciation
(Depreciation)
U.S.
Treasury
Ultra
Bond
(864)
3/25
$
(106,133,434)
$
(102,735,000)
$
3,398,434
Portfolio
of
Investments
December
31,
2024
(continued)
NBB
10
Fair
Value
Measurements
The
Fund’s
investments
in
securities
are
recorded
at
their
estimated
fair
value
utilizing
valuation
methods
approved
by
the
Board
of
Directors/
Trustees.
Fair
value
is
defined
as
the
price
that
would
be
received
upon
selling
an
investment
or
transferring
a
liability
in
an
orderly
transaction
to
an
independent
buyer
in
the
principal
or
most
advantageous
market
for
the
investment.
U.S.
GAAP
establishes
the
three-tier
hierarchy
which
is
used
to
maximize
the
use
of
observable
market
data
and
minimize
the
use
of
unobservable
inputs
and
to
establish
classification
of
fair
value
measurements
for
disclosure
purposes.
Observable
inputs
reflect
the
assumptions
market
participants
would
use
in
pricing
the
asset
or
liability.
Observable
inputs
are
based
on
market
data
obtained
from
sources
independent
of
the
reporting
entity.
Unobservable
inputs
reflect
management’s
assumptions
about
the
assumptions
market
participants
would
use
in
pricing
the
asset
or
liability.
Unobservable
inputs
are
based
on
the
best
information
available
in
the
circumstances.
The
following
is
a
summary
of
the
three-tiered
hierarchy
of
valuation
input
levels.
Level
1
–
Inputs
are
unadjusted
and
prices
are
determined
using
quoted
prices
in
active
markets
for
identical
securities.
Level
2
–
Prices
are
determined
using
other
significant
observable
inputs
(including
quoted
prices
for
similar
securities,
interest
rates,
credit
spreads,
etc.).
Level
3
–
Prices
are
determined
using
significant
unobservable
inputs
(including
management’s
assumptions
in
determining
the
fair
value
of
investments).
The
following
table
summarizes
the
market
value
of
the
Fund's
investments
as
of
the
end
of
the
reporting
period,
based
on
the
inputs
used
to
value
them:
NBB
Level
1
Level
2
Level
3
Total
Long-Term
Investments:
Municipal
Bonds
$
–
$
685,005,459
$
–
$
685,005,459
Short-Term
Investments:
Repurchase
Agreements
–
4,700,000
–
4,700,000
Investments
in
Derivatives:
Futures
Contracts*
3,398,434
–
–
3,398,434
Total
$
3,398,434
$
689,705,459
$
–
$
693,103,893
*
Represents
net
unrealized
appreciation
(depreciation).
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