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Nuveen Select Tax-Free Income Portfolio (NXP) NPORT-PMonthly portfolio investment report

Filed: 28 Feb 24, 12:00am

1

Nuveen

Select

Tax-Free

Income

Portfolio

Portfolio

of

Investments

December

31,

2023

(Unaudited)

NXP

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

LONG-TERM

INVESTMENTS

-

98.4%

X

–

MUNICIPAL

BONDS

-

97

.3

%

X

685,822,805

Arizona

-

3.0%

$

255

Arizona

Industrial

Development

Authority,

Arizona,

Education

Facility

Revenue

Bonds,

Basis

Schools,

Inc.

Projects,

Series

2017F,

3.000%,

7/01/26

No

Opt.

Call

$

252,488

1,950

Glendale

Municipal

Property

Corporation,

Arizona,

Excise

Tax

Revenue

Bonds,

Subordinate

Series

2012C,

4.000%,

7/01/38

1/24

at

100.00

1,950,460

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

781,538

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

1,359,311

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

2,084,072

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

2,026,374

1,250

Phoenix

Civic

Improvement

Corporation,

Arizona,

Airport

Revenue

Bonds,

Junior

Lien

Series

2015A,

5.000%,

7/01/34

7/25

at

100.00

1,280,545

3,185

Phoenix

Civic

Improvement

Corporation,

Arizona,

Airport

Revenue

Bonds,

Junior

Lien

Series

2019A,

5.000%,

7/01/44

7/29

at

100.00

3,448,102

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

5,207,668

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

2,687,642

Total

Arizona

21,078,200

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

2,311,458

500

Pulaski

County,

Arkansas,

Hospital

Revenue

Bonds,

Arkansas

Children's

Hospital,

Series

2023,

5.000%,

3/01/43

3/33

at

100.00

550,824

Total

Arkansas

2,862,282

California

-

16.8%

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

5,621,397

4,245

Anaheim

City

School

District,

Orange

County,

California,

General

Obligation

Bonds,

Election

2002

Series

2007,

0.010%,

8/01/31

-

AGM

Insured

No

Opt.

Call

3,419,667

Anaheim

Public

Financing

Authority,

California,

Lease

Revenue

Bonds,

Public

Improvement

Project,

Series

1997C

:

2,840

0.010%,

9/01/30

-

AGM

Insured

No

Opt.

Call

2,308,516

6,740

(c)

0.000%,

9/01/35

-

AGM

Insured,

(ETM)

No

Opt.

Call

4,787,452

5,760

0.000%,

9/01/35

-

AGM

Insured

No

Opt.

Call

3,879,437

Nuveen

Select

Tax-Free

Income

Portfolio

(continued)

Portfolio

of

Investments

December

31,

2023

(Unaudited)

2

NXP

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

California

(continued)

$

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

$

113,506

2,645

Cypress

Elementary

School

District,

Orange

County,

California,

General

Obligation

Bonds,

Series

2009A,

0.010%,

5/01/34

-

AGM

Insured

No

Opt.

Call

1,916,326

2,440

Eureka

Unified

School

District,

Humboldt

County,

California,

General

Obligation

Bonds,

Series

2002,

0.000%,

8/01/27

-

AGM

Insured

No

Opt.

Call

2,186,966

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

3,215,670

2,275

0.000%,

10/01/28

-

NPFG

Insured

No

Opt.

Call

1,981,264

1,000

Fresno,

California,

Airport

Revenue

Bonds,

Series

2023A,

5.000%,

7/01/53

-

BAM

Insured,

(AMT)

7/33

at

100.00

1,064,173

6,080

(c)

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

5,439,843

6,060

Grossmont

Union

High

School

District,

San

Diego

County,

California,

General

Obligation

Bonds,

Series

2006,

0.010%,

8/01/25

-

NPFG

Insured

No

Opt.

Call

5,767,159

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

1,118,640

4,055

Kern

Community

College

District,

California,

General

Obligation

Bonds,

Series

2003A,

0.000%,

3/01/28

-

FGIC

Insured

No

Opt.

Call

3,585,882

3,480

(d)

Mount

San

Antonio

Community

College

District,

Los

Angeles

County,

California,

General

Obligation

Bonds,

Election

of

2008,

Series

2013A,

0.000%,

8/01/43

8/35

at

100.00

3,472,147

450

M-S-R

Energy

Authority,

California,

Gas

Revenue

Bonds,

Citigroup

Prepay

Contracts,

Series

2009C,

6.500%,

11/01/39

No

Opt.

Call

579,864

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

9,231,968

1,195

Palmdale

School

District,

Los

Angeles

County,

California,

General

Obligation

Bonds,

Series

2003,

0.000%,

8/01/28

-

AGM

Insured

No

Opt.

Call

1,048,590

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

4,533,624

3,000

0.000%,

8/01/25

-

NPFG

Insured

No

Opt.

Call

2,851,485

8,790

Pittsburg

Redevelopment

Agency,

California,

Tax

Allocation

Bonds,

Los

Medanos

Community

Development

Project,

Series

1999,

0.010%,

8/01/29

-

AMBAC

Insured

No

Opt.

Call

7,356,218

12,240

(c)

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

9,060,654

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

1,166,231

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

6,193,651

8,000

0.010%,

8/01/33

No

Opt.

Call

5,987,914

3

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

California

(continued)

$

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

$

2,641,595

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

2,639,713

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

3,674,555

3,570

San

Diego

County

Regional

Airport

Authority,

California,

Airport

Revenue

Bonds,

International

Senior

Series

2023B,

5.000%,

7/01/48,

(AMT)

7/33

at

100.00

3,821,993

2,110

Sierra

Sands

Unified

School

District,

Kern

County,

California,

General

Obligation

Bonds,

Election

of

2006,

Series

2006A,

0.010%,

11/01/28

-

FGIC

Insured

No

Opt.

Call

1,808,886

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

4,968,871

1,150

Woodside

Elementary

School

District,

San

Mateo

County,

California,

General

Obligation

Bonds,

Election

of

2005,

Series

2007,

0.010%,

10/01/30

-

AMBAC

Insured

No

Opt.

Call

938,992

Total

California

118,382,849

Colorado

-

8.3%

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

4,273,318

150

Colorado

Health

Facilities

Authority,

Colorado,

Revenue

Bonds,

CommonSpirit

Health,

Series

2019A-1,

4.000%,

8/01/44

8/29

at

100.00

148,125

Colorado

Health

Facilities

Authority,

Colorado,

Revenue

Bonds,

CommonSpirit

Health,

Series

2019A-2

:

1,600

5.000%,

8/01/44

8/29

at

100.00

1,667,029

540

4.000%,

8/01/49

8/29

at

100.00

518,742

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

5,220,423

2,475

Colorado

State,

Certificates

of

Participation,

Rural

Series

2020A,

4.000%,

12/15/37

12/30

at

100.00

2,586,181

1,500

Denver

City

and

County,

Colorado,

Airport

System

Revenue

Bonds,

Series

2022A,

5.000%,

11/15/47,

(AMT)

11/32

at

100.00

1,606,389

2,275

Denver

City

and

County,

Colorado,

Airport

System

Revenue

Bonds,

Series

2022D,

5.750%,

11/15/45,

(AMT)

11/32

at

100.00

2,599,031

5,805

(c)

Denver

City

and

County,

Colorado,

Airport

System

Revenue

Bonds,

Subordinate

Lien

Series

2013B,

5.000%,

11/15/43,

(Pre-refunded

2/16/24)

2/24

at

100.00

5,815,404

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

4,666,879

E-470

Public

Highway

Authority,

Colorado,

Senior

Revenue

Bonds,

Series

2000B

:

5,140

0.000%,

9/01/24

-

NPFG

Insured

No

Opt.

Call

5,029,125

8,350

0.000%,

9/01/29

-

NPFG

Insured

No

Opt.

Call

7,053,864

1,295

0.000%,

9/01/32

-

NPFG

Insured

No

Opt.

Call

984,805

4,475

0.000%,

9/01/33

-

NPFG

Insured

No

Opt.

Call

3,277,751

12,500

E-470

Public

Highway

Authority,

Colorado,

Senior

Revenue

Bonds,

Series

2006A,

0.010%,

9/01/38

-

NPFG

Insured

9/26

at

54.77

6,187,371

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

1,028,693

620

5.000%,

12/01/35

12/25

at

100.00

635,132

Nuveen

Select

Tax-Free

Income

Portfolio

(continued)

Portfolio

of

Investments

December

31,

2023

(Unaudited)

4

NXP

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

Colorado

(continued)

$

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

$

5,411,306

Total

Colorado

58,709,568

Connecticut

-

4.2%

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

1,381,377

2,500

Connecticut

Health

and

Educational

Facilities

Authority,

Revenue

Bonds,

Fairfield

University,

Series

2022U,

4.000%,

7/01/52

7/32

at

100.00

2,429,287

1,175

Connecticut

Health

and

Educational

Facilities

Authority,

Revenue

Bonds,

Trinity

College,

Series

2021S,

4.000%,

6/01/51

12/31

at

100.00

1,174,104

5,100

Connecticut

State,

General

Obligation

Bonds,

Green

Series

2014G,

5.000%,

11/15/31

11/24

at

100.00

5,172,467

3,500

Connecticut

State,

General

Obligation

Bonds,

Series

2018C,

5.000%,

6/15/26

No

Opt.

Call

3,705,564

Connecticut

State,

Special

Tax

Obligation

Bonds,

Transportation

Infrastructure

Purposes

Series

2013A

:

3,475

5.000%,

10/01/30

1/24

at

100.00

3,479,006

2,490

(c)

5.000%,

10/01/33,

(Pre-refunded

1/29/24)

1/24

at

100.00

2,492,870

5,390

Connecticut

State,

Special

Tax

Obligation

Bonds,

Transportation

Infrastructure

Purposes,

Series

2021A,

4.000%,

5/01/40

5/31

at

100.00

5,573,996

3,000

(c)

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

3,051,861

750

University

of

Connecticut,

General

Obligation

Bonds,

Series

2015A,

5.000%,

3/15/31

3/26

at

100.00

784,595

Total

Connecticut

29,245,127

District

of

Columbia

-

1.8%

2,710

Metropolitan

Washington

Airports

Authority,

Virginia,

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

2,649,349

1,500

(c)

Metropolitan

Washington

Airports

Authority,

Virginia,

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

1,653,849

2,000

Metropolitan

Washington

Airports

Authority,

Virginia,

Dulles

Toll

Road

Revenue

Bonds,

Dulles

Metrorail

Capital

Appreciation,

Second

Senior

Lien

Series

2010B,

6.500%,

10/01/44

10/28

at

100.00

2,222,938

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

5,401,721

1,070

Washington

Metropolitan

Area

Transit

Authority,

Dedicated

Revenue

Bonds,

Green

Series

2021A,

4.000%,

7/15/46

7/31

at

100.00

1,072,173

Total

District

of

Columbia

13,000,030

Florida

-

2.9%

3,690

Florida

Development

Finance

Corporation,

Florida,

Surface

Transportation

Facility

Revenue

Bonds,

Brightline

Passenger

Rail

Project,

Series

2019A-2,

6.250%,

1/01/49,

(AMT),

(Mandatory

Put

12/18/24),

144A

2/24

at

100.00

3,689,676

7,000

Florida

Development

Finance

Corporation,

Revenue

Bonds,

Brightline

Passenger

Rail

Expansion

Project,

Series

2023C,

8.000%,

7/01/57,

(AMT),

(Mandatory

Put

4/01/24),

144A

1/24

at

103.00

7,145,517

5

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

Florida

(continued)

Greater

Orlando

Aviation

Authority,

Florida,

Orlando

Airport

Facilities

Revenue

Bonds,

Priority

Subordinated

Series

2017A

:

$

2,000

5.000%,

10/01/42,

(AMT)

10/27

at

100.00

$

2,064,975

1,545

5.000%,

10/01/47,

(AMT)

10/27

at

100.00

1,588,412

1,500

Lakeland,

Florida,

Hospital

System

Revenue

Bonds,

Lakeland

Regional

Health,

Series

2015,

5.000%,

11/15/45

11/24

at

100.00

1,507,466

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

2,061,435

2,395

Tampa,

Florida,

Hospital

Revenue

Bonds,

H.

Lee

Moffitt

Cancer

Center

Project,

Series

2020B,

4.000%,

7/01/45

7/30

at

100.00

2,382,833

Total

Florida

20,440,314

Georgia

-

1.1%

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

3,572,707

3,775

Main

Street

Natural

Gas

Inc.,

Georgia,

Gas

Supply

Revenue

Bonds,

Series

2023D,

5.000%,

12/01/54,

(Mandatory

Put

12/01/30)

9/30

at

100.08

4,017,212

Total

Georgia

7,589,919

Guam

-

1.5%

7,250

Government

of

Guam,

Business

Privilege

Tax

Bonds,

Refunding

Series

2015D,

5.000%,

11/15/39

11/25

at

100.00

7,307,662

1,740

Guam

Government

Waterworks

Authority,

Water

and

Wastewater

System

Revenue

Bonds,

Series

2013,

5.250%,

7/01/25

1/24

at

100.00

1,742,006

1,460

Guam

Government

Waterworks

Authority,

Water

and

Wastewater

System

Revenue

Bonds,

Series

2016,

5.000%,

1/01/46

7/26

at

100.00

1,483,135

Total

Guam

10,532,803

Hawaii

-

1.0%

6,895

Hawaii

State,

Airport

System

Revenue

Bonds,

Series

2015A,

5.000%,

7/01/41,

(AMT)

7/25

at

100.00

6,966,374

Total

Hawaii

6,966,374

Idaho

-

3.8%

5,000

Boise

City

Water

Renewal

System,

Idaho,

Revenue

Bonds,

Refunding

Series

2022,

5.000%,

9/01/47

9/32

at

100.00

5,501,965

1,600

Boise

State

University,

Idaho,

General

Revenue

Bonds,

Series

2023A,

5.000%,

4/01/48

4/33

at

100.00

1,779,368

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

10,006,587

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

1,386,060

Idaho

Housing

and

Finance

Association,

Nonprofit

Facilities

Revenue

Bonds,

The

College

of

Idaho

Project,

Series

2023

:

2,000

5.625%,

11/01/43,

144A

11/33

at

100.00

2,072,485

6,000

5.875%,

11/01/53,

144A

11/33

at

100.00

6,175,713

Total

Idaho

26,922,178

Illinois

-

8.5%

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

2,131,276

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

1,834,386

Nuveen

Select

Tax-Free

Income

Portfolio

(continued)

Portfolio

of

Investments

December

31,

2023

(Unaudited)

6

NXP

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

Illinois

(continued)

$

725

Chicago

Board

of

Education,

Illinois,

General

Obligation

Bonds,

Dedicated

Revenues,

Series

2016B,

6.500%,

12/01/46

12/26

at

100.00

$

759,077

3,900

Chicago

Board

of

Education,

Illinois,

General

Obligation

Bonds,

Series

1999A,

0.000%,

12/01/28

-

FGIC

Insured

No

Opt.

Call

3,230,386

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

45,557

880

Chicago,

Illinois,

General

Obligation

Bonds,

Project

&

Refunding

Series

2017A,

6.000%,

1/01/38

1/27

at

100.00

924,368

1,500

Chicago,

Illinois,

Midway

Airport

Revenue

Bonds,

Refunding

Senior

Lien

Series

2023C,

5.000%,

1/01/41

1/34

at

100.00

1,630,615

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

5,521,149

1,190

Chicago,

Illinois,

Water

Revenue

Bonds,

Second

Lien

Series

2023A,

5.250%,

11/01/53

-

AGM

Insured

5/33

at

100.00

1,312,162

2,500

Illinois

Toll

Highway

Authority,

Toll

Highway

Revenue

Bonds,

Senior

Lien

Series

2021A,

4.000%,

1/01/46

1/32

at

100.00

2,482,220

1,000

Kendall,

Kane,

and

Will

Counties

Community

Unit

School

District

308

Oswego, Illinois,

General

Obligation

Bonds,

Series

2008,

0.010%,

2/01/24

-

AGM

Insured

No

Opt.

Call

997,310

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

1,417,832

765

0.000%,

6/15/30

9/23

at

67.44

618,665

45

(c)

0.000%,

6/15/30,

(ETM)

No

Opt.

Call

37,568

2,500

0.000%,

12/15/30

-

NPFG

Insured

No

Opt.

Call

1,988,014

17,195

0.010%,

12/15/31

-

NPFG

Insured

No

Opt.

Call

13,214,352

1,350

0.000%,

6/15/35

-

NPFG

Insured

No

Opt.

Call

913,840

15,000

0.010%,

12/15/36

-

NPFG

Insured

No

Opt.

Call

9,418,466

2,000

0.000%,

6/15/37

-

NPFG

Insured

No

Opt.

Call

1,222,360

9,370

0.000%,

6/15/39

-

NPFG

Insured

No

Opt.

Call

5,075,634

5,000

Springfield,

Illinois,

Electric

Revenue

Bonds,

Refunding

Senior

Lien

Series

2015,

5.000%,

3/01/28

3/25

at

100.00

5,088,672

Total

Illinois

59,863,909

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

1,296,455

2,040

Indiana

Finance

Authority,

Hospital

Revenue

Bonds,

Indiana

Unversity

Health

Obligation

Group,

Refunding

2015A,

5.000%,

12/01/40

6/25

at

100.00

2,080,231

5,060

Indiana

Finance

Authority,

Hospital

Revenue

Bonds,

Marion

General

Hospital

Project,

Series

2020A,

4.000%,

7/01/45

7/30

at

100.00

4,817,322

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

874,044

Total

Indiana

9,068,052

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

1,216,025

Total

Iowa

1,216,025

7

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

Kentucky

-

0.1%

$

805

Kentucky

Public

Transportation

Infrastructure

Authority,

Toll

Revenue

Bonds,

Downtown

Crossing

Project,

Convertible

Capital

Appreciation

First

Tier

Series

2013C,

6.750%,

7/01/43

7/31

at

100.00

$

921,805

Total

Kentucky

921,805

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

1,957,876

Total

Louisiana

1,957,876

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

10,040,906

2,230

5.000%,

10/01/46

10/26

at

100.00

2,299,186

3,000

Massachusetts

Development

Finance

Agency,

Revenue

Bonds,

CareGroup

Issue,

Series

2018J-2,

5.000%,

7/01/43

7/28

at

100.00

3,136,463

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

6,662,580

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

568,287

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

2,520,204

5,000

Massachusetts

State,

Transportation

Fund

Revenue

Bonds,

Rail

Enhancement

Program,

Sustainability Green

Series

2022A,

5.000%,

6/01/50

6/31

at

100.00

5,446,099

1,000

Newburyport,

Massachusetts,

General

Obligation

Bonds,

Municipal

Purpose

Loan,

Refunding

Series

2013,

4.000%,

1/15/30

1/24

at

100.00

1,000,453

University

of

Massachusetts

Building

Authority,

Project

Revenue

Bonds,

Senior

Series

2014-1

:

480

5.000%,

11/01/39

11/24

at

100.00

485,221

255

(c)

5.000%,

11/01/39,

(Pre-refunded

11/01/24)

11/24

at

100.00

259,198

220

(c)

5.000%,

11/01/39,

(Pre-refunded

11/01/24)

11/24

at

100.00

223,622

210

(c)

5.000%,

11/01/39,

(Pre-refunded

11/01/24)

11/24

at

100.00

213,457

Total

Massachusetts

32,855,676

Michigan

-

0.8%

385

Michigan

State

Building

Authority,

Revenue

Bonds,

Facilities

Program,

Refunding

Series

2015-I,

5.000%,

4/15/38

10/25

at

100.00

395,581

4,000

Michigan

State

Building

Authority,

Revenue

Bonds,

Facilities

Program,

Refunding

Series

2016-I,

5.000%,

4/15/35

10/26

at

100.00

4,210,193

1,000

Wayne

County

Airport

Authority,

Michigan,

Revenue

Bonds,

Detroit

Metropolitan

Wayne

County

Airport,

Series

2023B,

5.500%,

12/01/48

-

AGM

Insured,

(AMT)

12/33

at

100.00

1,116,055

Total

Michigan

5,721,829

Missouri

-

2.7%

5,000

Jackson

County,

Missouri,

Special

Obligation

Bonds,

Series

2023A,

5.250%,

12/01/47

12/33

at

100.00

5,589,697

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

7,151,303

Nuveen

Select

Tax-Free

Income

Portfolio

(continued)

Portfolio

of

Investments

December

31,

2023

(Unaudited)

8

NXP

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

Missouri

(continued)

$

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

$

4,114,340

2,000

Missouri

Health

and

Educational

Facilities

Authority,

Health

Facilities

Revenue

Bonds,

CoxHealth,

Series

2013A,

5.000%,

11/15/38

1/24

at

100.00

2,001,508

Total

Missouri

18,856,848

Nebraska

-

1.3%

3,550

Central

Plains

Energy

Project,

Nebraska,

Gas

Project

4

Revenue

Bonds,

Refunding

Series

2023A-1,

5.000%,

5/01/54,

(Mandatory

Put

11/01/29)

8/29

at

100.13

3,765,060

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

550,862

2,700

5.000%,

11/01/45

11/25

at

100.00

2,746,526

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

255,211

305

5.000%,

7/01/27

7/25

at

100.00

311,476

500

(c)

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

504,564

1,000

University

of

Nebraska

Facilities

Corporation,

Nebraska,

Facilities

Program

Bonds,

Green

Series

2021B,

5.000%,

7/15/51

7/31

at

100.00

1,084,995

Total

Nebraska

9,218,694

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

1,757,452

3,000

Las

Vegas

Valley

Water

District,

Nevada,

General

Obligation

Bonds,

Refunding

Series

2015,

5.000%,

6/01/34

12/24

at

100.00

3,051,874

Total

Nevada

4,809,326

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

2,239,073

Total

New

Hampshire

2,239,073

New

Jersey

-

5.4%

3,495

Delaware

River

Port

Authority,

New

Jersey

and

Pennsylvania,

Revenue

Bonds, Series

2013,

5.000%,

1/01/37

1/24

at

100.00

3,504,206

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

939,934

2,000

(c)

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

2,173,604

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

313,173

260

5.000%,

7/01/29

-

AGM

Insured

7/25

at

100.00

266,939

New

Jersey

Transportation

Trust

Fund

Authority,

Transportation

System

Bonds,

Refunding

Series

2006C

:

4,900

0.010%,

12/15/28

-

AMBAC

Insured

No

Opt.

Call

4,203,628

9

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

New

Jersey

(continued)

$

35,000

0.010%,

12/15/34

-

AGM

Insured

No

Opt.

Call

$

24,786,293

2,000

New

Jersey

Transportation

Trust

Fund

Authority,

Transportation

System

Bonds,

Series

2015AA,

5.250%,

6/15/29

6/25

at

100.00

2,063,158

Total

New

Jersey

38,250,935

New

Mexico

-

0.7%

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

1,033,817

3,000

New

Mexico

Mortgage

Finance

Authority,

Multifamily

Housing

Revenue

Bonds,

St

Anthony,

Series

2007A,

5.250%,

9/01/42,

(AMT)

1/24

at

100.00

3,007,213

1,035

University

of

New

Mexico,

Revenue

Bonds,

Refunding

&

Improvement

Subordinate

Lien

Series

2016A,

4.500%,

6/01/36

6/26

at

100.00

1,057,375

Total

New

Mexico

5,098,405

New

York

-

2.4%

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

2,014,215

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

1,284,111

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

10,114,577

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

2,702,375

1,000

TSASC

Inc.,

New

York,

Tobacco

Settlement

Asset-Backed

Bonds,

Fiscal

2017

Series

B,

5.000%,

6/01/24

No

Opt.

Call

1,002,531

Total

New

York

17,117,809

North

Carolina

-

0.2%

1,000

Charlotte,

North

Carolina,

Airport

Revenue

Bonds,

Charlotte

Douglas

International,

Series

2023B,

5.000%,

7/01/48,

(AMT)

7/33

at

100.00

1,073,027

Total

North

Carolina

1,073,027

Ohio

-

0.2%

1,000

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

941,193

250

Ohio

Air

Quality

Development

Authority,

Ohio,

Pollution

Control

Revenue

Bonds,

FirstEnergy

Generation

Corporation

Project,

Refunding

Series

2009D,

3.375%,

8/01/29,

(Mandatory

Put

9/15/21)

No

Opt.

Call

227,676

Total

Ohio

1,168,869

Oklahoma

-

1.0%

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

1,208,600

5,000

Oklahoma

State

Turnpike

Authority,

Turnpike

System

Revenue

Bonds,

Second

Senior

Series

2023,

5.500%,

1/01/53

1/32

at

100.00

5,652,798

Total

Oklahoma

6,861,398

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

1,608,198

Nuveen

Select

Tax-Free

Income

Portfolio

(continued)

Portfolio

of

Investments

December

31,

2023

(Unaudited)

10

NXP

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

Oregon

(continued)

$

60

Clackamas

Community

College

District,

Oregon,

General

Obligation

Bonds,

Deferred

Interest

Series

2017A,

5.000%,

6/15/40

6/27

at

100.00

$

63,426

500

Clackamas

County

Hospital

Facility

Authority,

Oregon,

Senior

Living

Revenue

Bonds,

Willamette

View

Project,

Series

2017A,

5.000%,

11/15/52

11/25

at

102.00

450,685

2,000

Clackamas

County

School

District

12,

North

Clackamas,

Oregon,

General

Obligation

Bonds,

Deferred

Interest

Series

2017A,

0.000%,

6/15/41

6/27

at

53.27

917,974

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

2,241,390

3,000

(c)

Oregon

Facilities

Authority,

Revenue

Bonds,

Reed

College,

Series

2017A,

4.000%,

7/01/41,

(Pre-refunded

7/01/27)

7/27

at

100.00

3,146,732

2,000

Oregon

Facilities

Authority,

Revenue

Bonds,

Willamette

University,

Refunding

Series

2016B,

5.000%,

10/01/40

10/26

at

100.00

2,038,453

5,000

Oregon

Health

and

Science

University,

Revenue

Bonds,

Green

Series

2021A,

4.000%,

7/01/44

1/32

at

100.00

5,032,044

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

2,548,476

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

811,943

Yamhill

County,

Oregon,

Revenue

Bonds,

George

Fox

University

Project,

Refunding

Series

2021

:

1,500

4.000%,

12/01/36

12/31

at

100.00

1,509,169

1,875

4.000%,

12/01/41

12/31

at

100.00

1,866,982

Total

Oregon

22,235,472

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

1,090,288

Pennsylvania

Higher

Educational

Facilities

Authority,

Revenue

Bonds,

State

System

of

Higher

Education,

Series

2016AT-1

:

4,935

5.000%,

6/15/31

6/26

at

100.00

5,169,656

65

(c)

5.000%,

6/15/31,

(Pre-refunded

6/15/26)

6/26

at

100.00

68,489

Total

Pennsylvania

6,328,433

Puerto

Rico

-

2.4%

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

6,799,112

2,550

4.750%,

7/01/53

7/28

at

100.00

2,529,986

Puerto

Rico

Sales

Tax

Financing

Corporation,

Sales

Tax

Revenue

Bonds,

Taxable

Restructured

Cofina

Project

Series

2019A-2

:

4,000

4.329%,

7/01/40

7/28

at

100.00

3,980,856

3,624

4.784%,

7/01/58

7/28

at

100.00

3,581,199

536

Puerto

Rico,

General

Obligation

Bonds,

Clawback

Highway

Transportation

Authority

Claims

Taxable

Series

2022,

0.000%,

11/01/51

No

Opt.

Call

293,085

Total

Puerto

Rico

17,184,238

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

1,270,048

Total

South

Carolina

1,270,048

11

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

South

Dakota

-

0.1%

$

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

$

1,031,946

Total

South

Dakota

1,031,946

Tennessee

-

0.7%

5,000

Metropolitan

Nashville

Airport

Authority,

Tennessee,

Airport

Revenue

Bonds,

Subordinate

Series

2019B,

5.000%,

7/01/49,

(AMT)

7/30

at

100.00

5,183,049

Total

Tennessee

5,183,049

Texas

-

7.8%

4,675

(c)

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

4,819,674

Central

Texas

Regional

Mobility

Authority,

Revenue

Bonds,

Senior

Lien,

Series

2015A

:

110

(c)

5.000%,

1/01/33,

(Pre-refunded

7/01/25)

7/25

at

100.00

113,453

85

(c)

5.000%,

1/01/34,

(Pre-refunded

7/01/25)

7/25

at

100.00

87,668

240

(c)

5.000%,

1/01/35,

(Pre-refunded

7/01/25)

7/25

at

100.00

247,533

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

1,176,275

2,500

Harris

County

Flood

Control

District,

Texas,

Contract

Tax

Bonds,

Refunding

Series

2017A,

4.000%,

10/01/35

10/27

at

100.00

2,583,814

Harris

County-Houston

Sports

Authority,

Texas,

Revenue

Bonds,

Junior

Lien

Series

2001H

:

520

0.000%,

11/15/24

-

NPFG

Insured

No

Opt.

Call

503,910

110

(c)

0.000%,

11/15/24

-

NPFG

Insured,

(ETM)

No

Opt.

Call

106,708

2,935

0.000%,

11/15/30

-

NPFG

Insured

No

Opt.

Call

2,296,679

480

(c)

0.000%,

11/15/30

-

NPFG

Insured,

(ETM)

No

Opt.

Call

387,994

1,405

0.000%,

11/15/32

-

NPFG

Insured

11/31

at

94.05

988,143

2,510

0.000%,

11/15/36

-

NPFG

Insured

11/31

at

73.51

1,340,171

12,480

0.000%,

11/15/41

-

NPFG

Insured

11/31

at

53.78

4,672,370

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

1,353,154

4,230

0.000%,

11/15/35

-

NPFG

Insured

11/24

at

52.47

2,138,668

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

1,912,195

8,110

0.000%,

11/15/38

-

NPFG

Insured

11/30

at

61.17

3,840,883

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

562,304

5,325

Irving

Independent

School

District,

Dallas

County,

Texas,

General

Obligation

Bonds,

School

Building

Series

2023,

5.000%,

2/15/41

8/32

at

100.00

6,052,064

13,410

Lamar

Consolidated

Independent

School

District,

Fort

Bend

County,

Texas,

General

Obligation

Bonds,

Schoolhouse

Series

2023A,

5.000%,

2/15/53

2/33

at

100.00

14,837,761

430

Mission

Economic

Development

Corporation,

Texas,

Revenue

Bonds,

Natgasoline

Project,

Senior

Lien

Series

2018,

4.625%,

10/01/31,

(AMT),

144A

1/24

at

103.00

424,877

Nuveen

Select

Tax-Free

Income

Portfolio

(continued)

Portfolio

of

Investments

December

31,

2023

(Unaudited)

12

NXP

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

Texas

(continued)

North

Texas

Tollway

Authority,

System

Revenue

Bonds,

Refunding

First

Tier

Capital

Appreciation

Series

2008I

:

$

290

(c)

6.200%,

1/01/42,

(Pre-refunded

1/01/25)

-

AGC

Insured

1/25

at

100.00

$

299,120

2,000

(c)

6.500%,

1/01/43,

(Pre-refunded

1/01/25)

1/25

at

100.00

2,067,738

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

198,549

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

2,285,579

Total

Texas

55,297,284

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

1,654,136

Total

Virgin

Islands

1,654,136

Washington

-

5.2%

5,000

Port

of

Seattle,

Washington,

Revenue

Bonds,

Intermediate

Lien

Series

2019,

5.000%,

4/01/44,

(AMT)

4/29

at

100.00

5,237,055

3,485

Port

of

Seattle,

Washington,

Revenue

Bonds,

Refunding

Intermediate

Lien

Series

2021C,

5.000%,

8/01/46,

(AMT)

8/31

at

100.00

3,692,876

860

Snohomish

County

School

District

306

Lakewood,

Washington,

General

Obligation

Bonds,

Series

2014,

5.000%,

12/01/28

6/24

at

100.00

866,523

4,000

Washington

Health

Care

Facilities

Authority,

Revenue

Bonds,

Providence

Health

&

Services,

Refunding

Series

2012A,

5.000%,

10/01/32

1/24

at

100.00

4,001,358

5,000

Washington

Health

Care

Facilities

Authority,

Revenue

Bonds,

Providence

Health

&

Services,

Series

2014D,

5.000%,

10/01/38

10/24

at

100.00

5,001,224

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

7,707,580

5,710

Washington

State,

General

Obligation

Bonds,

Various

Purpose

Series

2015B,

5.000%,

2/01/37

2/25

at

100.00

5,812,365

2,060

Washington

State,

General

Obligation

Bonds,

Various

Purpose

Series

2016A-1,

5.000%,

8/01/39

8/25

at

100.00

2,103,994

2,115

Washington

State,

Motor

Vehicle

Fuel

Tax

General

Obligation

Bonds,

Series

2003F,

0.010%,

12/01/27

-

NPFG

Insured

No

Opt.

Call

1,891,525

Total

Washington

36,314,500

Wisconsin

-

1.0%

3,290

Wisconsin

Health

and

Educational

Facilities

Authority,

Revenue

Bonds,

Mercy

Alliance,

Inc.,

Series

2012,

5.000%,

6/01/39

1/24

at

100.00

3,291,978

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

4,002,521

Total

Wisconsin

7,294,499

Total

Municipal

Bonds

(cost

$632,502,472)

685,822,805

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.).

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:

Shares

Description

(a)

Value

X

–

COMMON

STOCKS

-

1

.1

%

X

7,746,759

Utilities

-

1.1%

96,774

(e),(f)

Energy

Harbor

Corp

$

7,746,759

Total

Utilities

7,746,759

Total

Common

Stocks

(cost

$2,699,742)

7,746,759

Total

Long-Term

Investments

(cost

$635,202,214)

693,569,564

Principal

Amount

(000)

Description

(a)

Optional

Call

Provisions

(b)

Value

SHORT-TERM

INVESTMENTS

-

1.0%

–

MUNICIPAL

BONDS

-

1

.0

%

X

7,000,000

New

Mexico

-

1.0%

$

7,000

(g)

New

Mexico

Hospital

Equipment

Loan

Council,

Hospital

Revenue

Bonds,

Presbyterian

Healthcare

Services,

Series

2008B,

4.050%,

8/01/34,

(Mandatory

Put

12/29/2023)

12/23

at

100.00

$

7,000,000

Total

New

Mexico

7,000,000

Total

Municipal

Bonds

(cost

$7,000,000)

7,000,000

Total

Short-Term

Investments

(cost

$7,000,000)

7,000,000

Total

Investments

(cost

$

642,202,214

)

-

99

.4

%

700,569,564

Borrowings

-

(0.3)%

(h)

(

2,378,211

)

Other

Assets

&

Liabilities,

Net

- 0.9%

6,337,014

Net

Assets

Applicable

to

Common

Shares

-

100%

$

704,528,367

Level

1

Level

2

Level

3

Total

Long-Term

Investments:

Municipal

Bonds

$

–

$

685,822,805

$

–

$

685,822,805

Common

Stocks

–

7,746,759

–

7,746,759

Short-Term

Investments:

Municipal

Bonds

–

7,000,000

–

7,000,000

Total

$

–

$

700,569,564

$

–

$

700,569,564

Nuveen

Select

Tax-Free

Income

Portfolio

(continued)

Portfolio

of

Investments

December

31,

2023

(Unaudited)

14

NXP

(a)

All

percentages

shown

in

the

Portfolio

of

Investments

are

based

on

net

assets

applicable

to

common

shares

unless

otherwise

noted.

(b)

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.

(c)

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.

(d)

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.

(e)

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. 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.

(f)

Non-income

producing;

issuer

has

not

declared

an

ex-dividend

date

within

the

past

twelve

months.

(g)

Investment

has

a

maturity

of

greater

than

one

year,

but

has

variable

rate

and/or

demand

features

which

qualify

it

as

a

short-term

investment.

The

rate

disclosed,

as

well

as

the

reference

rate

and

spread,

where

applicable,

is

that

in

effect

as

of

the

end

of

the

reporting

period.

This

rate

changes

periodically

based

on

market

conditions

or

a

specified

market

index.

(h)

Borrowings

as

a

percentage

of

Total

Investments

is

0.3%.

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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