1
Nuveen
Select
Tax-Free
Income
Portfolio
Portfolio
of
Investments
June
30,
2023
(Unaudited)
NXP
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
LONG-TERM
INVESTMENTS
-
99.6%   
X
665,435,009
MUNICIPAL
BONDS
-
98
.5
%
X
665,435,009
Arizona
-
3.1%
$
255
Arizona
Industrial
Development
Authority,
Arizona,
Education
Facility
Revenue
Bonds,
Basis
Schools,
Inc.
Projects,
Series
2017F,
3.000%,
7/01/26
No
Opt.
Call
AA-  
$
249,421
1,950
Glendale
Municipal
Property
Corporation,
Arizona,
Excise
Tax
Revenue
Bonds,
Subordinate
Series
2012C,
4.000%,
7/01/38
7/23
at
100.00
AA+  
1,903,492
1,000
Maricopa
County
Industrial
Development
Authority,
Arizona,
Education
Revenue
Bonds,
Legacy
Traditional
Schools
Projects,
Series
2021A,
4.000%,
7/01/51,
144A
7/31
at
100.00
BB+  
754,530
1,465
Maricopa
County
Industrial
Development
Authority,
Arizona,
Education
Revenue
Bonds,
Legacy
Traditional
Schools
Projects,
Taxable
Series
2019B,
5.000%,
7/01/54,
144A
7/29
at
100.00
BB+  
1,317,079
2,000
Maricopa
County
Industrial
Development
Authority,
Arizona,
Revenue
Bonds,
Banner
Health,
Refunding
Series
2016A,
5.000%,
1/01/38
1/27
at
100.00
AA-  
2,076,640
1,950
McAllister
Academic
Village
LLC,
Arizona,
Revenue
Bonds,
Arizona
State
University
Hassayampa
Academic
Village
Project,
Refunding
Series
2016,
5.000%,
7/01/37
7/26
at
100.00
AA-  
2,027,005
1,250
Phoenix
Civic
Improvement
Corporation,
Arizona,
Airport
Revenue
Bonds,
Junior
Lien
Series
2015A,
5.000%,
7/01/34
7/25
at
100.00
A+  
1,291,225
3,185
Phoenix
Civic
Improvement
Corporation,
Arizona,
Airport
Revenue
Bonds,
Junior
Lien
Series
2019A,
5.000%,
7/01/44
7/29
at
100.00
A+  
3,390,273
5,000
Phoenix
Civic
Improvement
Corporation,
Arizona,
Airport
Revenue
Bonds,
Junior
Lien
Series
2019B,
5.000%,
7/01/49,
(AMT)
7/29
at
100.00
Aa3  
5,175,950
500
Phoenix
Civic
Improvement
Corporation,
Arizona,
Rental
Car
Facility
Charge
Revenue
Bonds,
Series
2019A,
5.000%,
7/01/39
7/29
at
100.00
A  
531,415
2,410
Salt
Verde
Financial
Corporation,
Arizona,
Senior
Gas
Revenue
Bonds,
Citigroup
Energy
Inc
Prepay
Contract
Obligations,
Series
2007,
5.000%,
12/01/37
No
Opt.
Call
A3  
2,522,451
Total
Arizona
21,239,481
Arkansas
-
0.4%
6,555
Arkansas
Development
Finance
Authority,
Tobacco
Settlement
Revenue
Bonds,
Arkansas
Cancer
Research
Center
Project,
Series
2006,
0.000%,
7/01/46
-
AMBAC
Insured
No
Opt.
Call
Aa2  
2,194,942
500
Pulaski
County,
Arkansas,
Hospital
Revenue
Bonds,
Arkansas
Children's
Hospital,
Series
2023,
5.000%,
3/01/43
3/33
at
100.00
AA-  
537,195
Total
Arkansas
2,732,137
California
-
18.0%
11,000
Alhambra
Unified
School
District,
Los
Angeles
County,
California,
General
Obligation
Bonds,
Capital
Appreciation
Series
2009B,
0.000%,
8/01/41
-
AGC
Insured
No
Opt.
Call
AA  
5,177,150
4,245
Anaheim
City
School
District,
Orange
County,
California,
General
Obligation
Bonds,
Election
2002
Series
2007,
0.000%,
8/01/31
-
AGM
Insured
No
Opt.
Call
AA  
3,222,082
Anaheim
Public
Financing
Authority,
California,
Lease
Revenue
Bonds,
Public
Improvement
Project,
Series
1997C:
2,840
0.000%,
9/01/30
-
AGM
Insured
No
Opt.
Call
AA  
2,213,524
5,760
0.000%,
9/01/35
-
AGM
Insured
No
Opt.
Call
AA  
3,603,053
Nuveen
Select
Tax-Free
Income
Portfolio
(continued)
Portfolio
of
Investments
June
30,
2023
(Unaudited)
2
NXP
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
California
(continued)
$
6,740
0.000%,
9/01/35
-
AGM
Insured,
(ETM)
No
Opt.
Call
AA  (4)
$
4,500,231
120
California
County
Tobacco
Securitization
Agency,
Tobacco
Settlement
Asset-Backed
Bonds,
Los
Angeles
County
Securitization
Corporation,
Series
2020A,
4.000%,
6/01/49
6/30
at
100.00
BBB+  
111,044
1,630
California
State
Public
Works
Board,
Lease
Revenue
Bonds,
Various
Capital
Projects,
Series
2013I,
5.000%,
11/01/38
11/23
at
100.00
Aa3  
1,637,759
5,490
California
State,
General
Obligation
Bonds,
Refunding
Various
Purpose
Series
2022,
4.000%,
4/01/42
4/32
at
100.00
Aa2  
5,587,393
2,645
Cypress
Elementary
School
District,
Orange
County,
California,
General
Obligation
Bonds,
Series
2009A,
0.000%,
5/01/34
-
AGM
Insured
No
Opt.
Call
AA  
1,815,025
2,440
Eureka
Unified
School
District,
Humboldt
County,
California,
General
Obligation
Bonds,
Series
2002,
0.000%,
8/01/27
-
AGM
Insured
No
Opt.
Call
AA  
2,132,170
Folsom
Cordova
Unified
School
District,
Sacramento
County,
California,
General
Obligation
Bonds,
School
Facilities
Improvement
District
4,
Series
2007A:
3,290
0.000%,
10/01/24
-
NPFG
Insured
No
Opt.
Call
Aa2  
3,153,695
2,275
0.000%,
10/01/28
-
NPFG
Insured
No
Opt.
Call
Aa2  
1,913,389
1,000
Fresno,
California,
Airport
Revenue
Bonds,
Series
2023A,
5.000%,
7/01/53
-
BAM
Insured,
(AMT)
7/33
at
100.00
AA  
1,046,420
6,080
Golden
State
Tobacco
Securitization
Corporation,
California,
Enhanced
Tobacco
Settlement
Asset-Backed
Revenue
Bonds,
Series
2005A,
0.000%,
6/01/28
-
AMBAC
Insured,
(ETM)
No
Opt.
Call
Aa3  (4)
5,313,069
6,060
Grossmont
Union
High
School
District,
San
Diego
County,
California,
General
Obligation
Bonds,
Series
2006,
0.000%,
8/01/25
-
NPFG
Insured
No
Opt.
Call
Aa2  
5,647,132
1,495
Huntington
Beach
Union
High
School
District,
Orange
County,
California,
General
Obligation
Bonds,
Series
2007,
0.000%,
8/01/33
-
FGIC
Insured
No
Opt.
Call
Aa2  
1,076,385
4,055
Kern
Community
College
District,
California,
General
Obligation
Bonds,
Series
2003A,
0.000%,
3/01/28
-
FGIC
Insured
No
Opt.
Call
Aa2  
3,491,923
1,000
Moreno
Valley
Unified
School
District,
Riverside
County,
California,
General
Obligation
Bonds,
Refunding
Series
2007,
0.000%,
8/01/23
-
NPFG
Insured
No
Opt.
Call
A+  
997,480
3,480
Mount
San
Antonio
Community
College
District,
Los
Angeles
County,
California,
General
Obligation
Bonds,
Election
of
2008,
Series
2013A,
0.000%,
8/01/43
(5)
8/35
at
100.00
Aa1  
3,189,524
450
M-S-R
Energy
Authority,
California,
Gas
Revenue
Bonds,
Citigroup
Prepay
Contracts,
Series
2009C,
6.500%,
11/01/39
No
Opt.
Call
A  
541,201
11,985
Norwalk
La
Mirada
Unified
School
District,
Los
Angeles
County,
California,
General
Obligation
Bonds,
Election
2002,
Series
2007C,
0.000%,
8/01/32
-
AGM
Insured
No
Opt.
Call
AA  
8,757,440
1,250
Ontario
International
Airport
Authority,
California,
Revenue
Bonds,
Series
2021A,
5.000%,
5/15/46
-
AGM
Insured
5/31
at
100.00
AA  
1,359,100
1,195
Palmdale
School
District,
Los
Angeles
County,
California,
General
Obligation
Bonds,
Series
2003,
0.000%,
8/01/28
-
AGM
Insured
No
Opt.
Call
AA  
1,023,996
Palomar
Pomerado
Health,
California,
General
Obligation
Bonds,
Capital
Appreciation,
Election
of
2004,
Series
2007A:
4,620
0.000%,
8/01/24
-
NPFG
Insured
No
Opt.
Call
A1  
4,445,456
3,000
0.000%,
8/01/25
-
NPFG
Insured
No
Opt.
Call
A1  
2,784,840
8,790
Pittsburg
Redevelopment
Agency,
California,
Tax
Allocation
Bonds,
Los
Medanos
Community
Development
Project,
Series
1999,
0.000%,
8/01/29
-
AMBAC
Insured
No
Opt.
Call
AA  
6,983,919
3
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
California
(continued)
$
12,240
Placentia-Yorba
Linda
Unified
School
District,
Orange
County,
California,
Certificates
of
Participation,
Series
2006,
0.000%,
10/01/34
-
FGIC
Insured,
(ETM)
No
Opt.
Call
A1  (4)
$
8,600,191
1,500
Placer
Union
High
School
District,
Placer
County,
California,
General
Obligation
Bonds,
Series
2004C,
0.000%,
8/01/32
-
AGM
Insured
No
Opt.
Call
AA  
1,083,435
Poway
Unified
School
District,
San
Diego
County,
California,
General
Obligation
Bonds,
School
Facilities
Improvement
District
2007-1,
Election
2008
Series
2009A:
8,000
0.000%,
8/01/32
No
Opt.
Call
Aa2  
5,891,520
8,000
0.000%,
8/01/33
No
Opt.
Call
Aa2  
5,657,440
3,940
Rancho
Mirage
Redevelopment
Agency,
California,
Tax
Allocation
Bonds,
Combined
Whitewater
and
1984
Project
Areas,
Series
2003A,
0.000%,
4/01/35
-
NPFG
Insured
No
Opt.
Call
A+  
2,456,945
2,755
Sacramento
City
Unified
School
District,
Sacramento
County,
California,
General
Obligation
Bonds,
Series
2007,
0.000%,
7/01/25
-
AGM
Insured
No
Opt.
Call
A1  
2,564,354
3,510
San
Diego
Association
of
Governments,
California,
South
Bay
Expressway
Toll
Revenue
Bonds,
First
Senior
Lien
Series
2017A,
5.000%,
7/01/42
7/27
at
100.00
A  
3,670,161
San
Diego
County
Regional
Airport
Authority,
California,
Airport
Revenue
Bonds,
Subordinate
Series
2019B:
1,210
5.000%,
7/01/38,
(AMT)
7/29
at
100.00
A+  
1,266,241
1,305
5.000%,
7/01/39,
(AMT)
7/29
at
100.00
A+  
1,361,428
2,110
Sierra
Sands
Unified
School
District,
Kern
County,
California,
General
Obligation
Bonds,
Election
of
2006,
Series
2006A,
0.000%,
11/01/28
-
FGIC
Insured
No
Opt.
Call
AA  
1,755,731
6,025
Simi
Valley
Unified
School
District,
Ventura
County,
California,
General
Obligation
Bonds,
Election
of
2004
Series
2007C,
0.000%,
8/01/30
No
Opt.
Call
AA  
4,731,372
1,150
Woodside
Elementary
School
District,
San
Mateo
County,
California,
General
Obligation
Bonds,
Election
of
2005,
Series
2007,
0.000%,
10/01/30
-
AMBAC
Insured
No
Opt.
Call
AAA  
904,832
Total
California
121,668,050
Colorado
-
8.8%
4,150
Arkansas
River
Power
Authority,
Colorado,
Power
Supply
System
Revenue
Bonds,
Refunding
Series
2018A,
5.000%,
10/01/43
10/28
at
100.00
BBB  
4,153,403
150
Colorado
Health
Facilities
Authority,
Colorado,
Revenue
Bonds,
CommonSpirit
Health,
Series
2019A-1,
4.000%,
8/01/44
8/29
at
100.00
A-  
140,303
Colorado
Health
Facilities
Authority,
Colorado,
Revenue
Bonds,
CommonSpirit
Health,
Series
2019A-2:
1,600
5.000%,
8/01/44
8/29
at
100.00
A-  
1,652,592
540
4.000%,
8/01/49
8/29
at
100.00
A-  
494,402
5,000
Colorado
School
of
Mines
Board
of
Trustees,
Golden,
Colorado,
Institutional
Enterprise
Revenue
Bonds,
Series
2017B,
5.000%,
12/01/47
12/27
at
100.00
A+  
5,258,900
Colorado
State,
Certificates
of
Participation,
Rural
Series
2020A:
3,135
4.000%,
12/15/37
12/30
at
100.00
Aa2  
3,202,591
445
4.000%,
12/15/38
12/30
at
100.00
Aa2  
453,584
1,500
Denver
City
and
County,
Colorado,
Airport
System
Revenue
Bonds,
Series
2022A,
5.000%,
11/15/47,
(AMT)
11/32
at
100.00
AA-  
1,582,020
2,275
Denver
City
and
County,
Colorado,
Airport
System
Revenue
Bonds,
Series
2022D,
5.750%,
11/15/45,
(AMT)
11/32
at
100.00
AA-  
2,560,148
5,805
Denver
City
and
County,
Colorado,
Airport
System
Revenue
Bonds,
Subordinate
Lien
Series
2013B,
5.000%,
11/15/43
11/23
at
100.00
A+  
5,817,539
Nuveen
Select
Tax-Free
Income
Portfolio
(continued)
Portfolio
of
Investments
June
30,
2023
(Unaudited)
4
NXP
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
Colorado
(continued)
$
4,400
Denver
City
and
County,
Colorado,
Airport
System
Revenue
Bonds,
Subordinate
Lien
Series
2018B,
5.000%,
12/01/43
12/28
at
100.00
A+  
$
4,640,196
E-470
Public
Highway
Authority,
Colorado,
Senior
Revenue
Bonds,
Series
2000B:
5,140
0.000%,
9/01/24
-
NPFG
Insured
No
Opt.
Call
A  
4,941,699
8,350
0.000%,
9/01/29
-
NPFG
Insured
No
Opt.
Call
A+  
6,764,836
1,295
0.000%,
9/01/32
-
NPFG
Insured
No
Opt.
Call
A+  
929,745
4,475
0.000%,
9/01/33
-
NPFG
Insured
No
Opt.
Call
A+  
3,076,607
12,500
E-470
Public
Highway
Authority,
Colorado,
Senior
Revenue
Bonds,
Series
2006A,
0.000%,
9/01/38
-
NPFG
Insured
9/26
at
54.77
A  
5,983,375
715
E-470
Public
Highway
Authority,
Colorado,
Senior
Revenue
Bonds,
Series
2020A,
5.000%,
9/01/36
9/30
at
100.00
A+  
794,837
Park
Creek
Metropolitan
District,
Colorado,
Senior
Limited
Property
Tax
Supported
Revenue
Bonds,
Refunding
Series
2015A:
1,000
5.000%,
12/01/33
12/25
at
100.00
A  
1,025,850
620
5.000%,
12/01/35
12/25
at
100.00
A  
630,745
5,000
Windy
Gap
Firming
Project
Water
Activity
Enterprise,
Colorado,
Senior
Revenue
Bonds,
Series
2021,
5.000%,
7/15/51
7/31
at
100.00
AA  
5,389,800
Total
Colorado
59,493,172
Connecticut
-
4.5%
2,000
Connecticut
Health
and
Educational
Facilities
Authority,
Revenue
Bonds,
Avon
Old
Farms
School,
Series
2021D-1,
2.625%,
7/01/51
7/31
at
100.00
A3  
1,343,920
Connecticut
Health
and
Educational
Facilities
Authority,
Revenue
Bonds,
Trinity
College,
Series
2021S:
2,000
4.000%,
6/01/46
12/31
at
100.00
A+  
1,834,600
1,175
4.000%,
6/01/51
12/31
at
100.00
A+  
1,050,673
5,100
Connecticut
State,
General
Obligation
Bonds,
Green
Series
2014G,
5.000%,
11/15/31
11/24
at
100.00
AA-  
5,211,588
3,500
Connecticut
State,
General
Obligation
Bonds,
Series
2018C,
5.000%,
6/15/26
No
Opt.
Call
AA-  
3,700,165
Connecticut
State,
Special
Tax
Obligation
Bonds,
Transportation
Infrastructure
Purposes
Series
2013A:
3,475
5.000%,
10/01/30
10/23
at
100.00
AA  
3,487,510
2,490
5.000%,
10/01/33
10/23
at
100.00
AA  
2,497,993
1,625
Connecticut
State,
Special
Tax
Obligation
Bonds,
Transportation
Infrastructure
Purposes,
Series
2014A,
5.000%,
9/01/34
9/24
at
100.00
AA  
1,651,829
5,390
Connecticut
State,
Special
Tax
Obligation
Bonds,
Transportation
Infrastructure
Purposes,
Series
2021A,
4.000%,
5/01/40
5/31
at
100.00
AA  
5,449,344
3,000
Hartford
County
Metropolitan
District,
Connecticut,
Clean
Water
Project
Revenue
Bonds,
Refunding
Green
Bond
Series
2014A,
5.000%,
11/01/42,
(Pre-refunded
11/01/24)
11/24
at
100.00
AA  (4)
3,073,800
750
University
of
Connecticut,
General
Obligation
Bonds,
Series
2015A,
5.000%,
3/15/31
3/26
at
100.00
AA-  
785,100
Total
Connecticut
30,086,522
District
of
Columbia
-
2.3%
2,710
Metropolitan
Washington
Airports
Authority,
District
of
Columbia,
Dulles
Toll
Road
Revenue
Bonds,
Dulles
Metrorail
&
Capital
improvement
Projects,
Refunding
&
Subordinate
Lien
Series
2019B,
4.000%,
10/01/44
10/29
at
100.00
A-  
2,602,142
5
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
District
of
Columbia
(continued)
$
1,500
Metropolitan
Washington
Airports
Authority,
District
of
Columbia,
Dulles
Toll
Road
Revenue
Bonds,
Dulles
Metrorail
&
Capital
improvement
Projects,
Second
Senior
Lien
Series
2009C,
6.500%,
10/01/41,
(Pre-refunded
10/01/26)
-
AGC
Insured
10/26
at
100.00
AA  (4)
$
1,667,235
2,000
Metropolitan
Washington
Airports
Authority,
District
of
Columbia,
Dulles
Toll
Road
Revenue
Bonds,
Dulles
Metrorail
Capital
Appreciation,
Second
Senior
Lien
Series
2010B,
6.500%,
10/01/44
10/28
at
100.00
A-  
2,255,500
5,000
Metropolitan
Washington
D.C.
Airports
Authority,
Airport
System
Revenue
Bonds,
Refunding
Series
2023A,
5.250%,
10/01/53,
(AMT)
10/32
at
100.00
AA-  
5,330,600
1,070
Washington
Metropolitan
Area
Transit
Authority,
District
of
Columbia,
Dedicated
Revenue
Bonds,
Green
Series
2021A,
4.000%,
7/15/46
7/31
at
100.00
AA  
1,056,604
2,500
Washington
Metropolitan
Area
Transit
Authority,
District
of
Columbia,
Dedicated
Revenue
Bonds,
Series
2020A,
5.000%,
7/15/45
7/30
at
100.00
AA  
2,712,075
Total
District
of
Columbia
15,624,156
Florida
-
2.9%
1,040
Broward
County,
Florida,
Airport
System
Revenue
Bonds,
Series
2017,
5.000%,
10/01/47,
(AMT)
10/27
at
100.00
A+  
1,063,255
3,690
Florida
Development
Finance
Corporation,
Florida,
Surface
Transportation
Facility
Revenue
Bonds,
Virgin
Trains
USA
Passenger
Rail
Project,
Series
2019A,
6.250%,
1/01/49,
(AMT),
(Mandatory
Put
1/01/24),
144A
7/23
at
101.00
N/R  
3,677,343
7,000
Florida
Development
Finance
Corporation,
Revenue
Bonds,
Brightline
Passenger
Rail
Expansion
Project,
Series
2022A,
7.250%,
7/01/57,
(AMT),
(Mandatory
Put
10/03/23),
144A
7/23
at
103.00
N/R  
7,120,120
1,545
Greater
Orlando
Aviation
Authority,
Florida,
Orlando
Airport
Facilities
Revenue
Bonds,
Priority
Subordinated
Series
2017A,
5.000%,
10/01/47,
(AMT)
10/27
at
100.00
A+  
1,579,546
1,500
Lakeland,
Florida,
Hospital
System
Revenue
Bonds,
Lakeland
Regional
Health,
Series
2015,
5.000%,
11/15/45
11/24
at
100.00
A2  
1,505,535
2,000
Miami-Dade
County,
Florida,
General
Obligation
Bonds,
Build
Better
Communities
Program,
Series
2013A,
5.000%,
7/01/30
7/25
at
100.00
AA  
2,075,040
Tampa,
Florida,
Hospital
Revenue
Bonds,
H.
Lee
Moffitt
Cancer
Center
Project,
Series
2020B:
2,395
4.000%,
7/01/45
7/30
at
100.00
A2  
2,221,147
470
5.000%,
7/01/50
7/30
at
100.00
A2  
479,320
Total
Florida
19,721,306
Georgia
-
0.5%
3,665
Brookhaven
Development
Authority,
Georgia,
Revenue
Bonds,
Children's
Healthcare
of
Atlanta,
Inc.
Project,
Series
2019A,
4.000%,
7/01/49
7/29
at
100.00
AA+  
3,546,034
Total
Georgia
3,546,034
Guam
-
1.8%
7,250
Government
of
Guam,
Business
Privilege
Tax
Bonds,
Refunding
Series
2015D,
5.000%,
11/15/39
11/25
at
100.00
BB  
7,228,467
1,740
Guam
Government
Waterworks
Authority,
Water
and
Wastewater
System
Revenue
Bonds,
Series
2013,
5.250%,
7/01/25
7/23
at
100.00
A-  
1,741,288
1,460
Guam
Government
Waterworks
Authority,
Water
and
Wastewater
System
Revenue
Bonds,
Series
2016,
5.000%,
1/01/46
7/26
at
100.00
A-  
1,475,345
1,875
Guam
Power
Authority,
Revenue
Bonds,
Refunding
Series
2022A,
5.000%,
10/01/41
10/32
at
100.00
BBB  
1,944,487
Total
Guam
12,389,587
Nuveen
Select
Tax-Free
Income
Portfolio
(continued)
Portfolio
of
Investments
June
30,
2023
(Unaudited)
6
NXP
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
Hawaii
-
1.1%
$
6,895
Hawaii
State,
Airport
System
Revenue
Bonds,
Series
2015A,
5.000%,
7/01/41,
(AMT)
7/25
at
100.00
AA-  
$
6,961,882
645
Hawaii
State,
Harbor
System
Revenue
Bonds,
Series
2020A,
4.000%,
7/01/35,
(AMT)
7/30
at
100.00
Aa3  
650,095
Total
Hawaii
7,611,977
Idaho
-
2.5%
5,000
Boise
City
Water
Renewal
System,
Idaho,
Revenue
Bonds,
Refunding
Series
2022,
5.000%,
9/01/47
9/32
at
100.00
Aa2  
5,462,450
10,000
Idaho
Health
Facilities
Authority,
Revenue
Bonds,
Saint
Luke's
Health
System
Project,
Series
2014A,
5.000%,
3/01/44
3/24
at
100.00
A  
10,037,900
1,220
Idaho
Housing
&
Finance
Association,
Idaho,
Sales
Tax
Revenue
Bonds,
Transportation
Expansion
&
Congestion
Mitigation
Fund,
Series
2023A,
5.250%,
8/15/48
8/33
at
100.00
Aa1  
1,371,987
Total
Idaho
16,872,337
Illinois
-
9.2%
2,050
Chicago
Board
of
Education,
Illinois,
Dedicated
Capital
Improvement
Tax
Revenue
Bonds,
Series
2016,
6.000%,
4/01/46
4/27
at
100.00
A  
2,149,527
1,790
Chicago
Board
of
Education,
Illinois,
General
Obligation
Bonds,
Dedicated
Revenues,
Refunding
Series
2017C,
5.000%,
12/01/30
12/27
at
100.00
BB+  
1,843,306
725
Chicago
Board
of
Education,
Illinois,
General
Obligation
Bonds,
Dedicated
Revenues,
Series
2016B,
6.500%,
12/01/46
12/26
at
100.00
BB+  
759,909
3,900
Chicago
Board
of
Education,
Illinois,
General
Obligation
Bonds,
Series
1999A,
0.000%,
12/01/28
-
FGIC
Insured
No
Opt.
Call
Baa2  
3,132,363
55
Chicago
Board
of
Education,
Illinois,
Unlimited
Tax
General
Obligation
Bonds,
Dedicated
Tax
Revenues,
Series
1998B-1,
0.000%,
12/01/28
-
FGIC
Insured
No
Opt.
Call
Baa2  
44,174
880
Chicago,
Illinois,
General
Obligation
Bonds,
Project
&
Refunding
Series
2017A,
6.000%,
1/01/38
1/27
at
100.00
BBB+  
936,769
5,000
Chicago,
Illinois,
Wastewater
Transmission
Revenue
Bonds,
Second
Lien
Project,
Series
2023A,
5.250%,
1/01/53
-
AGM
Insured
7/33
at
100.00
AA  
5,450,250
1,190
Chicago,
Illinois,
Water
Revenue
Bonds,
Second
Lien
Series
2023A,
5.250%,
11/01/53
-
AGM
Insured
5/33
at
100.00
AA  
1,298,659
6,200
Illinois
State,
General
Obligation
Bonds,
Refunding
September
Series
2018B,
5.000%,
10/01/23
No
Opt.
Call
A-  
6,218,910
2,500
Illinois
Toll
Highway
Authority,
Toll
Highway
Revenue
Bonds,
Senior
Lien
Series
2021A,
4.000%,
1/01/46
1/32
at
100.00
AA-  
2,403,725
1,000
Kendall,
Kane,
and
Will
Counties
Community
Unit
School
District
308
Oswego,  Illinois,
General
Obligation
Bonds,
Series
2008,
0.000%,
2/01/24
-
AGM
Insured
No
Opt.
Call
A1  
979,380
Metropolitan
Pier
and
Exposition
Authority,
Illinois,
Revenue
Bonds,
McCormick
Place
Expansion
Project,
Series
2002A:
1,720
0.000%,
12/15/29
-
NPFG
Insured
No
Opt.
Call
A  
1,349,925
765
0.000%,
6/15/30
No
Opt.
Call
A  
585,531
45
0.000%,
6/15/30,
(ETM)
No
Opt.
Call
N/R  (4)
36,325
2,500
0.000%,
12/15/30
-
NPFG
Insured
No
Opt.
Call
A  
1,877,400
17,195
0.000%,
12/15/31
-
NPFG
Insured
No
Opt.
Call
A  
12,378,681
1,350
0.000%,
6/15/35
-
NPFG
Insured
No
Opt.
Call
A  
829,021
15,000
0.000%,
12/15/36
-
NPFG
Insured
No
Opt.
Call
A  
8,448,900
2,000
0.000%,
6/15/37
-
NPFG
Insured
No
Opt.
Call
A  
1,093,180
9,370
0.000%,
6/15/39
-
NPFG
Insured
No
Opt.
Call
A  
4,575,652
7
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
Illinois
(continued)
$
5,000
Springfield,
Illinois,
Electric
Revenue
Bonds,
Refunding
Senior
Lien
Series
2015,
5.000%,
3/01/28
3/25
at
100.00
A  
$
5,094,950
620
University
of
Illinois,
Health
Services
Facilities
System
Revenue
Bonds,
Series
2013,
6.000%,
10/01/42
10/23
at
100.00
A2  
623,999
Total
Illinois
62,110,536
Indiana
-
1.3%
1,600
Indiana
Bond
Bank,
Special
Program
Bonds,
Carmel
Junior
Waterworks
Project,
Series
2008B,
0.000%,
6/01/30
-
AGM
Insured
No
Opt.
Call
AA  
1,256,720
2,040
Indiana
Finance
Authority,
Hospital
Revenue
Bonds,
Indiana
University
Health
Obligation
Group,
Refunding
2015A,
5.000%,
12/01/40
6/25
at
100.00
AA  
2,086,879
5,060
Indiana
Finance
Authority,
Hospital
Revenue
Bonds,
Marion
General
Hospital
Project,
Series
2020A,
4.000%,
7/01/45
7/30
at
100.00
A  
4,851,225
1,000
Zionsville
Community
Schools
Building
Corporation,
Boone
County,
Indiana,
First
Mortgage
Bonds,
Series
2005Z,
0.000%,
7/15/28
-
AGM
Insured
No
Opt.
Call
AA  
846,650
Total
Indiana
9,041,474
Iowa
-
0.2%
1,165
Iowa
Finance
Authority,
Iowa,
Midwestern
Disaster
Area
Revenue
Bonds,
Iowa
Fertilizer
Company
Project,
Refunding
Series
2022,
5.000%,
12/01/50,
(Mandatory
Put
12/01/42)
12/29
at
103.00
BBB-  
1,193,939
Total
Iowa
1,193,939
Kentucky
-
0.1%
805
Kentucky
Public
Transportation
Infrastructure
Authority,
Toll
Revenue
Bonds,
Downtown
Crossing
Project,
Convertible
Capital
Appreciation
First
Tier
Series
2013C,
0.000%,
7/01/43
(5)
7/31
at
100.00
Baa2  
923,134
Total
Kentucky
923,134
Louisiana
-
0.3%
1,870
Jefferson
Sales
Tax
District,
Jefferson
Parish,
Louisiana,
Special
Sales
Tax
Revenue
Bonds,
Series
2017B,
5.000%,
12/01/42
-
AGM
Insured
12/27
at
100.00
AA  
1,947,268
Total
Louisiana
1,947,268
Massachusetts
-
4.7%
Massachusetts
Development
Finance
Agency,
Revenue
Bonds,
Boston
University,
Series
2016BB-1:
10,000
4.000%,
10/01/46
10/26
at
100.00
AA-  
9,893,700
2,230
5.000%,
10/01/46
10/26
at
100.00
AA-  
2,301,851
3,000
Massachusetts
Development
Finance
Agency,
Revenue
Bonds,
CareGroup
Issue,
Series
2018J-2,
5.000%,
7/01/43
7/28
at
100.00
A  
3,112,410
6,500
Massachusetts
Development
Finance
Agency,
Revenue
Bonds,
Dana-
Farber
Cancer
Institute
Issue,
Series
2016N,
5.000%,
12/01/46
12/26
at
100.00
A1  
6,652,945
4,600
Massachusetts
Development
Finance
Agency,
Revenue
Bonds,
Olin
College,
Series
2013E,
5.000%,
11/01/43
11/23
at
100.00
A  
4,611,868
600
Massachusetts
Development
Finance
Agency,
Revenue
Bonds,
UMass
Memorial
Health
Care
Obligated
Group
Issue,
Series
2017L,
3.625%,
7/01/37
7/27
at
100.00
A-  
533,946
2,415
Massachusetts
State,
Transportation
Fund
Revenue
Bonds,
Rail
Enhancement
&
Accelerated
Bridge
Programs,
Series
2017A,
5.000%,
6/01/47
6/27
at
100.00
AAA  
2,529,543
1,000
Newburyport,
Massachusetts,
General
Obligation
Bonds,
Municipal
Purpose
Loan,
Refunding
Series
2013,
4.000%,
1/15/30
7/23
at
100.00
AAA  
1,000,570
Nuveen
Select
Tax-Free
Income
Portfolio
(continued)
Portfolio
of
Investments
June
30,
2023
(Unaudited)
8
NXP
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
Massachusetts
(continued)
University
of
Massachusetts
Building
Authority,
Project
Revenue
Bonds,
Senior
Series
2014-1:
$
255
5.000%,
11/01/39,
(Pre-refunded
11/01/24)
2020
11/24
at
100.00
N/R  (4)
$
261,105
480
5.000%,
11/01/39
11/24
at
100.00
AA  
486,797
210
5.000%,
11/01/39,
(Pre-refunded
11/01/24)
11/24
at
100.00
N/R  (4)
215,027
220
5.000%,
11/01/39,
(Pre-refunded
11/01/24)
11/24
at
100.00
N/R  (4)
225,267
Total
Massachusetts
31,825,029
Michigan
-
0.7%
385
Michigan
State
Building
Authority,
Revenue
Bonds,
Facilities
Program,
Refunding
Series
2015-I,
5.000%,
4/15/38
10/25
at
100.00
Aa2  
397,378
4,000
Michigan
State
Building
Authority,
Revenue
Bonds,
Facilities
Program,
Refunding
Series
2016-I,
5.000%,
4/15/35
10/26
at
100.00
Aa2  
4,249,920
Total
Michigan
4,647,298
Missouri
-
2.8%
5,000
Jackson
County,
Missouri,
Special
Obligation
Bonds,
Series
2023A,
5.250%,
12/01/47
12/33
at
100.00
AA-  
5,450,150
7,000
Kansas
City
Industrial
Development
Authority,
Missouri,
Airport
Special
Obligation
Bonds,
Kansas
City
International
Airport
Terminal
Modernization
Project,
Series
2019B,
5.000%,
3/01/54,
(AMT)
3/29
at
100.00
A2  
7,141,120
5,000
Kansas
City
Municipal
Assistance
Corporation,
Missouri,
Leasehold
Revenue
Bonds,
Improvement
Series
2004B-1,
0.000%,
4/15/30
-
AMBAC
Insured
No
Opt.
Call
AA-  
3,973,350
2,000
Missouri
Health
and
Educational
Facilities
Authority,
Health
Facilities
Revenue
Bonds,
CoxHealth,
Series
2013A,
5.000%,
11/15/38
11/23
at
100.00
A2  
2,001,460
Total
Missouri
18,566,080
Nebraska
-
1.0%
Douglas
County
Hospital
Authority
3,
Nebraska,
Health
Facilities
Revenue
Bonds,
Nebraska
Methodist
Health
System,
Refunding
Series
2015:
545
4.125%,
11/01/36
11/25
at
100.00
A  
547,191
2,700
5.000%,
11/01/45
11/25
at
100.00
A  
2,729,160
Madison
County
Hospital
Authority
1,
Nebraska,
Hospital
Revenue
Bonds,
Faith
Regional
Health
Services
Project,
Series
2018:
250
5.000%,
7/01/26
7/25
at
100.00
BBB  
254,582
305
5.000%,
7/01/27
7/25
at
100.00
BBB  
311,228
500
Platte
County
School
District
001,
Columbus
Public
Schools,
Nebraska,
General
Obligation
Bonds,
School
Building
Series
2014,
5.000%,
12/15/39,
(Pre-refunded
6/15/24)
6/24
at
100.00
Aa3  (4)
508,215
2,000
University
of
Nebraska
Facilities
Corporation,
Nebraska,
Facilities
Program
Bonds,
Green
Series
2021B,
5.000%,
7/15/51
7/31
at
100.00
Aa1  
2,167,400
Total
Nebraska
6,517,776
Nevada
-
0.7%
1,710
Carson
City,
Nevada,
Hospital
Revenue
Bonds,
Carson
Tahoe
Regional
Healthcare
Project,
Series
2017A,
5.000%,
9/01/37
9/27
at
100.00
A-  
1,746,765
3,000
Las
Vegas
Valley
Water
District,
Nevada,
General
Obligation
Bonds,
Refunding
Series
2015,
5.000%,
6/01/34
12/24
at
100.00
Aa1  
3,071,130
Total
Nevada
4,817,895
9
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
New
Hampshire
-
0.3%
$
2,250
New
Hampshire
Business
Finance
Authority,
Solid
Waste
Disposal
Revenue
Bonds,
Waste
Management
Inc.
Project,
Series
2003,
3.125%,
8/01/24,
(AMT)
No
Opt.
Call
A-  
$
2,229,480
Total
New
Hampshire
2,229,480
New
Jersey
-
5.8%
3,495
Delaware
River
Port
Authority,
New
Jersey
and
Pennsylvania,
Revenue
Bonds,  Series
2013,
5.000%,
1/01/37
1/24
at
100.00
A+  
3,518,102
940
New
Jersey
Economic
Development
Authority,
Private
Activity
Bonds,
The
Goethals
Bridge
Replacement
Project,
Series
2013,
5.125%,
1/01/39
-
AGM
Insured,
(AMT)
1/24
at
100.00
AA  
943,910
3,230
New
Jersey
Economic
Development
Authority,
Revenue
Bonds,
New
Jersey
Transit
Corporation
Projects
Sublease,
Refunding
Series
2017B,
5.000%,
11/01/23
No
Opt.
Call
A3  
3,245,795
2,000
New
Jersey
Economic
Development
Authority,
School
Facilities
Construction
Bonds,
Refunding
Series
2016BBB,
5.500%,
6/15/31,
(Pre-refunded
12/15/26)
12/26
at
100.00
A2  (4)
2,176,280
New
Jersey
Health
Care
Facilities
Financing
Authority,
Revenue
Bonds,
University
Hospital
Issue,
Refunding
Series
2015A:
305
5.000%,
7/01/28
-
AGM
Insured
7/25
at
100.00
AA  
312,823
260
5.000%,
7/01/29
-
AGM
Insured
7/25
at
100.00
AA  
266,763
New
Jersey
Transportation
Trust
Fund
Authority,
Transportation
System
Bonds,
Refunding
Series
2006C:
4,900
0.000%,
12/15/28
-
AMBAC
Insured
No
Opt.
Call
A2  
4,066,559
35,000
0.000%,
12/15/34
-
AGM
Insured
No
Opt.
Call
AA  
22,644,650
2,000
New
Jersey
Transportation
Trust
Fund
Authority,
Transportation
System
Bonds,
Series
2015AA,
5.250%,
6/15/29
6/25
at
100.00
A3  
2,067,300
Total
New
Jersey
39,242,182
New
Mexico
-
0.9%
1,000
Albuquerque,
New
Mexico,
Refuse
Removal
and
Disposal
Revenue
Bonds,
Series
2020,
4.000%,
7/01/43
7/30
at
100.00
AA  
1,001,140
1,000
Farmington
Municipal
School
District
5,
San
Juan
County,
New
Mexico,
General
Obligation
Bonds,
School
Building
Series
2015,
5.000%,
9/01/28
9/25
at
100.00
Aa3  
1,036,360
3,000
New
Mexico
Mortgage
Finance
Authority,
Multifamily
Housing
Revenue
Bonds,
St
Anthony,
Series
2007A,
5.250%,
9/01/42,
(AMT)
7/23
at
100.00
N/R  
3,006,660
1,035
University
of
New
Mexico,
Revenue
Bonds,
Refunding
&
Improvement
Subordinate
Lien
Series
2016A,
4.500%,
6/01/36
6/26
at
100.00
AA-  
1,054,644
Total
New
Mexico
6,098,804
New
York
-
2.5%
2,000
Metropolitan
Transportation
Authority,
New
York,
Transportation
Revenue
Bonds,
Green
Climate
Bond
Certified
Series
2019A-1,
5.000%,
11/15/48,
(Mandatory
Put
11/15/24)
No
Opt.
Call
A3  
2,021,440
1,260
New
York
City
Municipal
Water
Finance
Authority,
New
York,
Water
and
Sewer
System
Second
General
Resolution
Revenue
Bonds,
Fiscal
2015
Series
HH,
5.000%,
6/15/37
6/25
at
100.00
AA+  
1,296,540
10,000
New
York
State
Urban
Development
Corporation,
State
Personal
Income
Tax
Revenue
Bonds,
General
Purpose,
Series
2020A,
4.000%,
3/15/45
9/30
at
100.00
Aa1  
9,868,400
2,500
Port
Authority
of
New
York
and
New
Jersey,
Consolidated
Revenue
Bonds,
Two
Hundred
Thirty-Four
Series
2022,
5.250%,
8/01/47,
(AMT)
8/32
at
100.00
AA-  
2,687,650
Nuveen
Select
Tax-Free
Income
Portfolio
(continued)
Portfolio
of
Investments
June
30,
2023
(Unaudited)
10
NXP
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
New
York
(continued)
$
1,000
TSASC
Inc.,
New
York,
Tobacco
Settlement
Asset-Backed
Bonds,
Fiscal
2017
Series
B,
5.000%,
6/01/24
No
Opt.
Call
B-  
$
1,010,630
Total
New
York
16,884,660
Ohio
-
0.2%
1,005
Buckeye
Tobacco
Settlement
Financing
Authority,
Ohio,
Tobacco
Settlement
Asset-Backed
Revenue
Bonds,
Refunding
Senior
Lien
Series
2020B-2
Class
2,
5.000%,
6/01/55
6/30
at
100.00
N/R  
942,640
250
Ohio
Air
Quality
Development
Authority,
Ohio,
Pollution
Control
Revenue
Bonds,
FirstEnergy
Generation
Corporation
Project,
Refunding
Series
2009D,
3.375%,
8/01/29
No
Opt.
Call
BBB-  
227,207
3,000
Ohio
Water
Development
Authority,
Pollution
Control
Revenue
Bonds,
FirstEnergy
Nuclear
Generating
Corporation
Project,
Refunding
Series
2005B,
4.000%,
1/01/34
(6)
No
Opt.
Call
N/R  
30
Total
Ohio
1,169,877
Oklahoma
-
0.2%
1,230
Oklahoma
Development
Finance
Authority,
Health
System
Revenue
Bonds,
OU
Medicine
Project,
Series
2018B,
5.000%,
8/15/38
8/28
at
100.00
BB-  
1,153,408
Total
Oklahoma
1,153,408
Oregon
-
3.2%
1,505
Beaverton
School
District
48J,
Washington
and
Multnomah
Counties,
Oregon,
General
Obligation
Bonds,
Convertible
Deferred
Interest
Series
2017D,
5.000%,
6/15/36
6/27
at
100.00
AA+  
1,600,733
60
Clackamas
Community
College
District,
Oregon,
General
Obligation
Bonds,
Deferred
Interest
Series
2017A,
5.000%,
6/15/40
6/27
at
100.00
Aa1  
63,180
Clackamas
County
Hospital
Facility
Authority,
Oregon,
Senior
Living
Revenue
Bonds,
Willamette
View
Project,
Series
2017A:
515
4.000%,
11/15/23
No
Opt.
Call
N/R  
514,073
500
5.000%,
11/15/52
11/25
at
102.00
N/R  
443,865
2,130
Medford
Hospital
Facilities
Authority,
Oregon,
Hospital
Revenue
Bonds,
Asante
Health
System,
Refunding
Series
2020A,
5.000%,
8/15/50
8/30
at
100.00
A+  
2,214,582
3,000
Oregon
Facilities
Authority,
Revenue
Bonds,
Reed
College,
Series
2017A,
4.000%,
7/01/41,
(Pre-refunded
7/01/27)
7/27
at
100.00
Aa2  (4)
3,132,390
2,000
Oregon
Facilities
Authority,
Revenue
Bonds,
Willamette
University,
Refunding
Series
2016B,
5.000%,
10/01/40
10/26
at
100.00
BBB  
2,029,840
5,000
Oregon
Health
and
Science
University,
Revenue
Bonds,
Green
Series
2021A,
4.000%,
7/01/44
1/32
at
100.00
AA-  
5,017,400
2,500
Salem
Hospital
Facility
Authority,
Oregon,
Revenue
Bonds,
Salem
Health
Projects,
Refunding
Series
2016A,
5.000%,
5/15/46
5/26
at
100.00
AA-  
2,548,575
750
Washington
and
Clackamas
Counties
School
District
23J
Tigard-
Tualatin,
Oregon,
General
Obligation
Bonds,
Series
2017,
5.000%,
6/15/30
6/27
at
100.00
AA+  
810,690
Yamhill
County,
Oregon,
Revenue
Bonds,
George
Fox
University
Project,
Refunding
Series
2021:
1,500
4.000%,
12/01/36
12/31
at
100.00
A-  
1,503,120
1,875
4.000%,
12/01/41
12/31
at
100.00
A-  
1,807,575
Total
Oregon
21,686,023
Pennsylvania
-
0.9%
1,500
Beaver
County
Industrial
Development
Authority,
Pennsylvania,
Pollution
Control
Revenue
Refunding
Bonds,
FirstEnergy
Generation
Project,
Series
2008B,
3.750%,
10/01/47
4/31
at
100.00
BBB-  
1,101,885
11
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
Pennsylvania
(continued)
$
5,000
Pennsylvania
Higher
Educational
Facilities
Authority,
Revenue
Bonds,
State
System
of
Higher
Education,
Series
2016AT-1,
5.000%,
6/15/31
6/26
at
100.00
Aa3  
$
5,228,400
Total
Pennsylvania
6,330,285
Puerto
Rico
-
2.7%
2,087
Puerto
Rico
Highway
and
Transportation
Authority,
Restructured
Toll
Revenue
Bonds,
Series
2022A,
5.000%,
7/01/62
7/32
at
100.00
N/R  
2,034,930
56
Puerto
Rico
Highway
and
Transportation
Authority,
Restructured
Toll
Revenue
Bonds,
Series
2022B,
0.000%,
7/01/32
No
Opt.
Call
N/R  
36,079
97
Puerto
Rico
Highway
and
Transportation
Authority,
Restructured
Toll
Revenue
Bonds,
Series
2022C,
5.000%,
7/01/53
1/33
at
100.00
N/R  
59,310
Puerto
Rico
Sales
Tax
Financing
Corporation,
Sales
Tax
Revenue
Bonds,
Restructured
2018A-1:
21,600
0.000%,
7/01/46
7/28
at
41.38
N/R  
6,094,872
2,550
4.750%,
7/01/53
7/28
at
100.00
N/R  
2,436,219
3,560
5.000%,
7/01/58
7/28
at
100.00
N/R  
3,479,402
4,000
Puerto
Rico
Sales
Tax
Financing
Corporation,
Sales
Tax
Revenue
Bonds,
Taxable
Restructured
Cofina
Project
Series
2019A-2,
4.329%,
7/01/40
7/28
at
100.00
N/R  
3,814,120
555
Puerto
Rico,
General
Obligation
Bonds,
Clawback
Highway
Transportation
Authority
Claims
Taxable
Series
2022,
0.000%,
11/01/51
No
Opt.
Call
N/R  
282,301
Total
Puerto
Rico
18,237,233
South
Carolina
-
0.2%
1,270
South
Carolina
Transportation
Infrastructure
Bank,
Revenue
Bonds,
Refunding
Series
2015A,
2.900%,
10/01/25
10/24
at
100.00
Aa3  
1,252,791
Total
South
Carolina
1,252,791
South
Dakota
-
0.2%
1,000
South
Dakota
Health
and
Educational
Facilities
Authority,
Revenue
Bonds,
Sanford
Health,
Series
2015,
5.000%,
11/01/35
11/25
at
100.00
AA-  
1,032,400
Total
South
Dakota
1,032,400
Tennessee
-
0.8%
5,000
Metropolitan
Nashville
Airport
Authority,
Tennessee,
Airport
Revenue
Bonds,
Subordinate
Series
2019B,
5.000%,
7/01/49,
(AMT)
7/30
at
100.00
A2  
5,173,750
Total
Tennessee
5,173,750
Texas
-
6.5%
4,675
Alamo
Regional
Mobility
Authority,
Texas,
Vehicle
Registration
Fee
Revenue
Bonds,
Senior
Lien
Series
2016,
5.000%,
6/15/46,
(Pre-
refunded
6/15/25)
6/25
at
100.00
AA+  (4)
4,842,459
Central
Texas
Regional
Mobility
Authority,
Revenue
Bonds,
Senior
Lien,
Series
2015A:
110
5.000%,
1/01/33,
(Pre-refunded
7/01/25)
7/25
at
100.00
A  (4)
114,041
85
5.000%,
1/01/34,
(Pre-refunded
7/01/25)
7/25
at
100.00
A  (4)
88,123
240
5.000%,
1/01/35,
(Pre-refunded
7/01/25)
7/25
at
100.00
A  (4)
248,818
10,765
Grand
Parkway
Transportation
Corporation,
Texas,
System
Toll
Revenue
Bonds,
First
Tier
Series
2013A,
5.500%,
4/01/53,
(Pre-refunded
10/01/23)
10/23
at
100.00
N/R  (4)
10,822,808
1,160
Harris
County
Cultural
Education
Facilities
Finance
Corporation,
Texas,
Revenue
Bonds,
Houston
Methodist
Hospital
System,
Series
2015,
5.000%,
12/01/45
6/25
at
100.00
AA  
1,178,862
2,500
Harris
County
Flood
Control
District,
Texas,
Contract
Tax
Bonds,
Refunding
Series
2017A,
4.000%,
10/01/35
10/27
at
100.00
AAA  
2,563,475
Nuveen
Select
Tax-Free
Income
Portfolio
(continued)
Portfolio
of
Investments
June
30,
2023
(Unaudited)
12
NXP
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
Texas
(continued)
Harris
County-Houston
Sports
Authority,
Texas,
Revenue
Bonds,
Junior
Lien
Series
2001H:
$
520
0.000%,
11/15/24
-
NPFG
Insured
No
Opt.
Call
Baa2  
$
492,242
110
0.000%,
11/15/24
-
NPFG
Insured,
(ETM)
No
Opt.
Call
Baa2  (4)
104,585
2,935
0.000%,
11/15/30
-
NPFG
Insured
No
Opt.
Call
Baa2  
2,179,384
480
0.000%,
11/15/30
-
NPFG
Insured,
(ETM)
No
Opt.
Call
Baa2  (4)
374,640
1,405
0.000%,
11/15/32
-
NPFG
Insured
11/31
at
94.05
Baa2  
928,480
2,510
0.000%,
11/15/36
-
NPFG
Insured
11/31
at
73.51
Baa2  
1,252,766
12,480
0.000%,
11/15/41
-
NPFG
Insured
11/31
at
53.78
Baa2  
4,396,455
Harris
County-Houston
Sports
Authority,
Texas,
Revenue
Bonds,
Third
Lien
Series
2004A-3:
2,235
0.000%,
11/15/32
-
NPFG
Insured
11/24
at
62.71
Baa2  
1,318,292
4,230
0.000%,
11/15/35
-
NPFG
Insured
11/24
at
52.47
Baa2  
2,079,891
Harris
County-Houston
Sports
Authority,
Texas,
Special
Revenue
Bonds,
Refunding
Senior
Lien
Series
2001A:
3,045
0.000%,
11/15/34
-
NPFG
Insured
11/30
at
78.27
AA  
1,774,078
8,110
0.000%,
11/15/38
-
NPFG
Insured
11/30
at
61.17
AA  
3,565,561
575
Houston,
Texas,
Hotel
Occupancy
Tax
and
Special
Revenue
Bonds,
Convention
and
Entertainment
Project,
Series
2001B,
0.000%,
9/01/24
-
AMBAC
Insured
No
Opt.
Call
A  
549,689
430
Mission
Economic
Development
Corporation,
Texas,
Revenue
Bonds,
Natgasoline
Project,
Senior
Lien
Series
2018,
4.625%,
10/01/31,
(AMT),
144A
7/23
at
104.00
BB-  
419,469
North
Texas
Tollway
Authority,
System
Revenue
Bonds,
Refunding
First
Tier
Capital
Appreciation
Series
2008I:
290
6.200%,
1/01/42,
(Pre-refunded
1/01/25)
-
AGC
Insured
1/25
at
100.00
AA  (4)
302,795
2,000
6.500%,
1/01/43,
(Pre-refunded
1/01/25)
1/25
at
100.00
AA-  (4)
2,093,920
200
Tarrant
County
Cultural
Education
Facilities
Finance
Corporation,
Texas,
Hospital
Revenue
Bonds,
Scott
&
White
Healthcare
Project,
Series
2016A,
4.000%,
11/15/42
5/26
at
100.00
AA-  
192,992
2,410
Texas
Turnpike
Authority,
Central
Texas
Turnpike
System
Revenue
Bonds,
First
Tier
Series
2002A,
0.000%,
8/15/25
-
AMBAC
Insured
No
Opt.
Call
A+  
2,236,817
Total
Texas
44,120,642
Virgin
Islands
-
0.2%
1,645
Matching
Fund
Special
Purpose
Securitization
Corporation,
Virgin
Islands,
Revenue
Bonds,
Series
2022A,
5.000%,
10/01/39
10/32
at
100.00
N/R  
1,627,333
Total
Virgin
Islands
1,627,333
Virginia
-
0.6%
3,500
Chesapeake,
Virginia,
Transportation
System
Senior
Toll
Road
Revenue
Bonds,
Capital
Appreciation
Series
2012B,
0.000%,
7/15/32
(5)
7/28
at
100.00
A-  
3,670,765
Total
Virginia
3,670,765
Washington
-
5.3%
5,985
Port
of
Seattle,
Washington,
Revenue
Bonds,
Intermediate
Lien
Series
2019,
5.000%,
4/01/44,
(AMT)
4/29
at
100.00
AA-  
6,199,682
860
Snohomish
County
School
District
306
Lakewood,
Washington,
General
Obligation
Bonds,
Series
2014,
5.000%,
12/01/28
6/24
at
100.00
Aaa  
873,777
4,000
Washington
Health
Care
Facilities
Authority,
Revenue
Bonds,
Providence
Health
&
Services,
Refunding
Series
2012A,
5.000%,
10/01/32
7/23
at
100.00
A  
4,001,000
5,000
Washington
Health
Care
Facilities
Authority,
Revenue
Bonds,
Providence
Health
&
Services,
Series
2014D,
5.000%,
10/01/38
10/24
at
100.00
A  
5,005,750
13
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.
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.).
Principal
Amount
(000)
Description
(1)
Optional
Call
Provisions
(2)
Ratings
(3)
Value
Washington
(continued)
$
8,390
Washington
State
Convention
Center
Public
Facilities
District,
Lodging
Tax
Revenue
Bonds,
Refunding
Series2021B.
Exchange
Purchase,
4.000%,
7/01/58
7/31
at
100.00
Baa1  
$
7,132,255
5,710
Washington
State,
General
Obligation
Bonds,
Various
Purpose
Series
2015B,
5.000%,
2/01/37
2/25
at
100.00
Aaa  
5,850,523
2,060
Washington
State,
General
Obligation
Bonds,
Various
Purpose
Series
2016A-1,
5.000%,
8/01/39
8/25
at
100.00
Aaa  
2,117,886
2,535
Washington
State,
General
Obligation
Bonds,
Various
Purpose
Series
2017A,
5.000%,
8/01/38
8/26
at
100.00
Aaa  
2,650,774
2,115
Washington
State,
Motor
Vehicle
Fuel
Tax
General
Obligation
Bonds,
Series
2003F,
0.000%,
12/01/27
-
NPFG
Insured
No
Opt.
Call
Aaa  
1,835,101
Total
Washington
35,666,748
Wisconsin
-
1.1%
3,290
Wisconsin
Health
and
Educational
Facilities
Authority,
Revenue
Bonds,
Mercy
Alliance,
Inc.,
Series
2012,
5.000%,
6/01/39
7/23
at
100.00
A3  
3,289,737
3,855
Wisconsin
Health
and
Educational
Facilities
Authority,
Wisconsin,
Revenue
Bonds,
Medical
College
of
Wisconsin,
Inc.,
Series
2016,
5.000%,
12/01/41
11/26
at
100.00
AA-  
3,993,703
Total
Wisconsin
7,283,440
Total
Municipal
Bonds
(cost
$630,355,327)
665,435,009
Shares
Description
(1)
Value
X
7,461,662
COMMON
STOCKS
-
1
.1
%
X
7,461,662
Independent
Power
and
Renewable
Electricity
Producers
-
1.1%
96,774
Energy
Harbor
Corp
(7),(8)
$
7,461,662
Total
Independent
Power
and
Renewable
Electricity
Producers
7,461,662
Total
Common
Stocks
(cost
$2,699,742)
7,461,662
Total
Long-Term
Investments
(cost
$633,055,069)
672,896,671
Borrowings
-
(0.4)%
(9)
(
2,627,192
)
Other
Assets
&
Liabilities,
Net
-  0.8%
5,630,879
Net
Assets
Applicable
to
Common
Shares
-
100%
$
675,900,358
Nuveen
Select
Tax-Free
Income
Portfolio
(continued)
Portfolio
of
Investments
June
30,
2023
(Unaudited)
14
NXP
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:
Level
1
Level
2
Level
3
Total
Long-Term
Investments:
Municipal
Bonds
$
–
$
665,435,009
$
–
$
665,435,009
Common
Stocks
–
7,461,662
–
7,461,662
Total
$
–
$
672,896,671
$
–
$
672,896,671
(1)
All
percentages
shown
in
the
Portfolio
of
Investments
are
based
on
net
assets
applicable
to
common
shares
unless
otherwise
noted.
(2)
Optional
Call
Provisions:
Dates
(month
and
year)
and
prices
of
the
earliest
optional
call
or
redemption.
There
may
be
other
call
provisions
at
varying
prices
at
later
dates.
Certain
mortgage-backed
securities
may
be
subject
to
periodic
principal
paydowns.
(3)
For
financial
reporting
purposes,
the
ratings
disclosed
are
the
highest
of
Standard
&
Poor’s
Group
(“Standard
&
Poor’s”),
Moody’s
Investors
Service,
Inc.
(“Moody’s”)
or
Fitch,
Inc.
(“Fitch”)
rating.
This
treatment
of
split-rated
securities
may
differ
from
that
used
for
other
purposes,
such
as
for
Fund
investment
policies.
Ratings
below
BBB
by
Standard
&
Poor’s,
Baa
by
Moody’s
or
BBB
by
Fitch
are
considered
to
be
below
investment
grade.
Holdings
designated
N/R
are
not
rated
by
any
of
these
national
rating
agencies.
(4)
Backed
by
an
escrow
or
trust
containing
sufficient
U.S.
Government
or
U.S.
Government
agency
securities,
which
ensure
the
timely
payment
of
principal
and
interest.
(5)
Step-up
coupon
bond,
a
bond
with
a
coupon
that
increases
("steps
up"),
usually
at
regular
intervals,
while
the
bond
is
outstanding.
The
rate
shown
is
the
coupon
as
of
the
end
of
the
reporting
period.
(6)
Defaulted
security.
A
security
whose
issuer
has
failed
to
fully
pay
principal
and/or
interest
when
due,
or
is
under
the
protection
of
bankruptcy.
(7)
Energy
Harbor
Corp
(ENGH)
common
stock
received
as
part
of
the
bankruptcy
settlement
during
February
2020
for
Ohio
Water
Development
Authority,
Pollution
Control
Revenue
Refunding
Bonds,FirstEnergy
Nuclear
Generating
Corporation
Project,
Series
2005B,
0.000%,
1/01/34.
Various
funds
and
accounts
managed
by
Nuveen,
including
the
Fund,
collectively
are
a
substantial
minority
holder
of
ENGH’s
outstanding
shares
of
common
stock,
and
possess
certain
other
rights
with
respect
to
the
corporate
governance
of
ENGH.
Due
to
these
facts,
under
the
federal
securities
laws,
the
securities
of
ENGH
held
by
Nuveen
funds
and
accounts,
including
the
Fund,
cannot
be
sold
except
under
limited
conditions
(which
are
not  currently
satisfied).
The
Fund
is
therefore
unable
to
sell
such
shares
in
ordinary
secondary
market
transactions
at
this
time.
On
March
6,
2023
Vistra
Corp.
(“Vistra”)
announced
that
it
has
executed
a
definitive
agreement
with
Energy
Harbor
Corp.,
pursuant
to
which
Energy
Harbor
will
merge
with
and
into
a
newly-formed
subsidiary
of
Vistra.  The
companies
anticipate
closing
the
transaction
in
the
second
half
of
2023.  In
connection
with
the
transaction,
Nuveen
funds
and
accounts
expect
to
receive
a
combination
of
cash
and
shares
in
a
newly
formed
entity.
Nuveen
expects
these
shares
to
be
issued
in
a
private
transaction
and
may
have
reduced
secondary
market
liquidity.  The
transaction
is
subject
to
certain
regulatory
approvals
and
there
can
be
no
assurance
that
the
transaction
will
close.
(8)
Non-income
producing;
issuer
has
not
declared
an
ex-dividend
date
within
the
past
twelve
months.
(9)
Borrowings
as
a
percentage
of
Total
Investments
is
0.4%.
144A
Investment
is
exempt
from
registration
under
Rule
144A
of
the
Securities
Act
of
1933,
as
amended.
These
investments
may
only
be
resold
in
transactions
exempt
from
registration,
which
are
normally
those
transactions
with
qualified
institutional
buyers.
AMT
Alternative
Minimum
Tax
ETM
Escrowed
to
maturity
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