Edgar Filing: NUVEEN SELECT TAX FREE INCOME PORTFOLIO 2

Nuveen Select Tax-Free Income Portfolio 2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-06622

Nuveen Select Tax-Free Income Portfolio 2

(Exact name of registrant as specified in charter)

Nuveen Investments

333 West Wacker Drive, Chicago, Illinois 60606

(Address of principal executive offices) (Zip code)

Gifford R. Zimmerman

Vice President and Secretary

333 West Wacker Drive, Chicago, Illinois 60606

(Name and address of agent for service)

Registrant’s telephone number, including area code: 312-917-7700

Date of fiscal year end: March 31

Date of reporting period: June 30, 2018

Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget (“OMB”) control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

Item 1. Schedule of Investments

NXQ

Nuveen Select Tax-Free Income Portfolio 2

Portfolio of Investments June 30, 2018

(Unaudited)

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	LONG-TERM INVESTMENTS – 99.4%
	MUNICIPAL BONDS – 99.3%
	Alaska – 0.4%
$ 1,000	Northern Tobacco Securitization Corporation, Alaska, Tobacco Settlement Asset-Backed Bonds, Series 2006A, 5.000%, 6/01/32	8/18 at 100.00	B3	$ 1,000,060
	Arizona – 3.5%
2,500	Arizona Health Facilities Authority, Hospital Revenue Bonds, Catholic Healthcare West, Series 2011B-1&2, 5.250%, 3/01/39	3/21 at 100.00	A	2,678,525
280	Maricopa County Industrial Development Authority, Arizona, Education Revenue Bonds, Paradise Schools Projects, Series 2016, 2.875%, 7/01/21, 144A	No Opt. Call	BB+	278,765
1,000	Maricopa County Industrial Development Authority, Arizona, Revenue Bonds, Banner Health, Refunding Series 2016A, 5.000%, 1/01/38	1/27 at 100.00	AA-	1,136,940
1,160	Phoenix Industrial Development Authority, Arizona, Lease Revenue Bonds, Rowan University Project, Series 2012, 5.000%, 6/01/42 – AGM Insured	6/22 at 100.00	A	1,248,543
600	Pima County Industrial Development Authority, Arizona, Revenue Bonds, Tucson Electric Power Company, Series 2010A, 5.250%, 10/01/40	10/20 at 100.00	A-	639,978
2,250	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	BBB+	2,736,810
215	Sedona Wastewater Municipal Property Corporation, Arizona Excise Tax Revenue Bonds, Series 1998, 0.000%, 7/01/20 – NPFG Insured	No Opt. Call	Baa2	207,084
8,005	Total Arizona			8,926,645
	California – 14.8%
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	AA	4,624,840
1,500	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Los Angeles County Securitization Corporation, Series 2006A, 5.600%, 6/01/36	12/18 at 100.00	B2	1,512,990
60	California State, General Obligation Bonds, Series 1997, 5.000%, 10/01/18 – AMBAC Insured	9/18 at 100.00	AA-	60,170
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	1,829,073
3,290	Folsom Cordova Unified School District, Sacramento County, California, General Obligation Bonds, School Facilities Improvement District 4, Series 2007A, 0.000%, 10/01/24 – NPFG Insured	No Opt. Call	AA-	2,789,558
1,000	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed Bonds, Series 2007A-1, 5.125%, 6/01/47	8/18 at 100.00	B+	1,000,020
3,030	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	2,493,902
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	887,312

NXQ	Nuveen Select Tax-Free Income Portfolio 2 (continued)
	Portfolio of Investments June 30, 2018
	(Unaudited)

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	California (continued)
$ 1,160	Mount San Antonio Community College District, Los Angeles County, California, General Obligation Bonds, Election of 2008, Series 2013A, 0.000%, 8/01/43 (4)	8/35 at 100.00	Aa1	$959,251
450	M-S-R Energy Authority, California, Gas Revenue Bonds, Citigroup Prepay Contracts, Series 2009C, 6.500%, 11/01/39	No Opt. Call	A	643,104
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	868,669
590	Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2009, 6.750%, 11/01/39 (Pre-refunded 11/01/19)	11/19 at 100.00	N/R (5)	630,958
4,620	Palomar Pomerado Health, California, General Obligation Bonds, Capital Appreciation, Election of 2004, Series 2007A, 0.000%, 8/01/24 – NPFG Insured	No Opt. Call	A	3,875,995
4,400	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-	3,005,684
2,500	Placentia-Yorba Linda Unified School District, Orange County, California, Certificates of Participation, Series 2006, 0.000%, 10/01/34 – NPFG Insured (ETM)	No Opt. Call	A+ (5)	1,558,600
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	Aa3	2,250,945
1,395	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	1,611,127
	San Joaquin Delta Community College District, California, General Obligation Bonds, Election 2004 Series 2008B:
1,000	0.000%, 8/01/30 – AGM Insured	8/18 at 50.12	AA	500,540
1,890	0.000%, 8/01/31 – AGM Insured	8/18 at 47.14	AA	889,736
6,025	Simi Valley Unified School District, Ventura County, California, General Obligation Bonds, Series 2007C, 0.000%, 8/01/30	No Opt. Call	AA	4,033,617
2,080	Tobacco Securitization Authority of Northern California, Tobacco Settlement Asset-Backed Bonds, Series 2005A-1, 5.500%, 6/01/45	8/18 at 100.00	B-	2,082,767
53,875	Total California			38,108,858
	Colorado – 7.3%
500	Colorado Health Facilities Authority, Colorado, Revenue Bonds, Catholic Health Initiatives, Series 2009A, 5.500%, 7/01/34	7/19 at 100.00	BBB+	514,540
1,975	Colorado Health Facilities Authority, Colorado, Revenue Bonds, Sisters of Charity of Leavenworth Health Services Corporation, Series 2010A, 5.000%, 1/01/40	1/20 at 100.00	AA-	2,054,375
1,580	Colorado School of Mines Board of Trustees, Golden, Colorado, Institutional Enterprise Revenue Bonds, Series 2017B, 5.000%, 12/01/42	12/27 at 100.00	A+	1,802,590
1,935	Denver City and County, Colorado, Airport System Revenue Bonds, Subordinate Lien Series 2013B, 5.000%, 11/15/43	11/23 at 100.00	A	2,125,443
	E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2000B:
5,140	0.000%, 9/01/24 – NPFG Insured	No Opt. Call	A	4,370,388
8,100	0.000%, 9/01/29 – NPFG Insured	No Opt. Call	A	5,517,315
4,475	0.000%, 9/01/33 – NPFG Insured	No Opt. Call	A	2,563,012
23,705	Total Colorado			18,947,663
	Connecticut – 2.6%
2,600	Connecticut State, General Obligation Bonds, Green Series 2014G, 5.000%, 11/15/31	11/24 at 100.00	A1	2,848,716

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Connecticut (continued)
$ 1,000	Connecticut State, General Obligation Bonds, Refunding Series 2018C, 5.000%, 6/15/26	No Opt. Call	A1	$1,129,190
2,490	Connecticut State, Special Tax Obligation Bonds, Transportation Infrastructure Purposes Series 2013A, 5.000%, 10/01/33	10/23 at 100.00	AA	2,708,448
6,090	Total Connecticut			6,686,354
	Florida – 1.6%
	Broward County, Florida, Airport System Revenue Bonds, Series 2017:
1,155	5.000%, 10/01/42 (Alternative Minimum Tax)	10/27 at 100.00	A+	1,304,399
1,040	5.000%, 10/01/47 (Alternative Minimum Tax)	10/27 at 100.00	A+	1,170,125
1,500	Lakeland, Florida, Hospital System Revenue Bonds, Lakeland Regional Health, Series 2015, 5.000%, 11/15/45	11/24 at 100.00	A2	1,644,390
3,695	Total Florida			4,118,914
	Guam – 1.9%
1,500	Government of Guam, Business Privilege Tax Bonds, Refunding Series 2015D, 5.000%, 11/15/39	11/25 at 100.00	A	1,633,755
1,675	Government of Guam, Hotel Occupancy Tax Revenue Bonds, Series 2011A, 6.000%, 11/01/26	5/21 at 100.00	A-	1,816,336
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-	1,591,371
4,635	Total Guam			5,041,462
	Idaho – 1.7%
4,000	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-	4,305,520
	Illinois – 12.9%
1,615	Board of Trustees of Southern Illinois University, Housing and Auxiliary Facilities System Revenue Bonds, Series 1999A, 0.000%, 4/01/23 – NPFG Insured	No Opt. Call	Baa2	1,385,945
750	Chicago Board of Education, Illinois, Dedicated Capital Improvement Tax Revenue Bonds, Series 2016, 6.000%, 4/01/46	4/27 at 100.00	A	879,352
735	Chicago Board of Education, Illinois, General Obligation Bonds, Dedicated Revenues Series 2011A, 5.000%, 12/01/41	12/21 at 100.00	BB-	738,168
760	Chicago Board of Education, Illinois, General Obligation Bonds, Dedicated Revenues, Refunding Series 2017C, 5.000%, 12/01/30	12/27 at 100.00	BB-	795,401
365	Chicago Board of Education, Illinois, General Obligation Bonds, Dedicated Revenues, Series 2016B, 6.500%, 12/01/46	12/26 at 100.00	BB-	418,659
1,340	Chicago, Illinois, General Airport Revenue Bonds, O'Hare International Airport, Senior Lien Refunding Series 2016C, 5.000%, 1/01/20	No Opt. Call	A	1,402,739
435	Chicago, Illinois, General Obligation Bonds, Project & Refunding Series 2006A, 4.625%, 1/01/31 – AGM Insured	9/18 at 100.00	AA	436,405
1,335	Chicago, Illinois, General Obligation Bonds, Project & Refunding Series 2007C, 5.000%, 1/01/27 – NPFG Insured	9/18 at 100.00	BBB+	1,338,511
2,245	Illinois Finance Authority, Revenue Bonds, Northwestern Memorial HealthCare, Series 2013, 5.000%, 8/15/43	8/22 at 100.00	AA+	2,430,257

NXQ	Nuveen Select Tax-Free Income Portfolio 2 (continued)
	Portfolio of Investments June 30, 2018
	(Unaudited)

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Illinois (continued)
$ 1,750	Illinois Finance Authority, Revenue Bonds, Silver Cross Hospital and Medical Centers, Refunding Series 2008A, 5.500%, 8/15/30	8/18 at 100.00	BBB+	$1,755,320
1,315	Illinois State, General Obligation Bonds, October Series 2016, 5.000%, 2/01/19	No Opt. Call	BBB	1,334,699
2,190	Illinois State, General Obligation Bonds, Refunding Series 2012, 5.000%, 8/01/23	No Opt. Call	BBB	2,322,714
	Metropolitan Pier and Exposition Authority, Illinois, Revenue Bonds, McCormick Place Expansion Project, Series 2002A:
6,350	0.000%, 12/15/31 – NPFG Insured	No Opt. Call	Baa2	3,517,709
1,350	0.000%, 6/15/35 – NPFG Insured	No Opt. Call	Baa2	620,406
5,000	0.000%, 12/15/36 – NPFG Insured	No Opt. Call	Baa2	2,125,750
9,370	0.000%, 6/15/39 – NPFG Insured	No Opt. Call	Baa2	3,468,774
5,045	Sauk Village, Illinois, General Obligation Alternate Revenue Source Bonds, Tax Increment, Series 2002A, 5.000%, 6/01/22 – RAAI Insured	9/18 at 100.00	AA	5,053,476
1,135	Sauk Village, Illinois, General Obligation Alternate Revenue Source Bonds, Tax Increment, Series 2002B, 0.000%, 12/01/18 – RAAI Insured	No Opt. Call	AA	1,125,284
1,825	Springfield, Illinois, Electric Revenue Bonds, Senior Lien Series 2015, 5.000%, 3/01/28	3/25 at 100.00	A	2,042,649
44,910	Total Illinois			33,192,218
	Indiana – 2.1%
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	1,059,600
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	2,275,375
	Indianapolis Local Public Improvement Bond Bank, Indiana, Waterworks Project Series 2009A:
355	5.500%, 1/01/38 (Pre-refunded 1/01/19) – AGC Insured	1/19 at 100.00	AA (5)	362,128
1,470	5.500%, 1/01/38 – AGC Insured	1/19 at 100.00	AA	1,496,872
225	Whiting Redevelopment District, Indiana, Tax Increment Revenue Bonds, Lakefront Development Project, Series 2010, 6.000%, 1/15/19	No Opt. Call	N/R	226,087
5,690	Total Indiana			5,420,062
	Iowa – 2.5%
710	Iowa Finance Authority, Iowa, Midwestern Disaster Area Revenue Bonds, Iowa Fertilizer Company Project, Series 2016, 5.875%, 12/01/26, 144A	12/19 at 104.00	B	746,089
830	Iowa Finance Authority, Iowa, Midwestern Disaster Area Revenue Bonds, Iowa Fertilizer Company Project, Series 2018B, 5.250%, 12/01/50 (Mandatory Put 12/01/22)	12/22 at 105.00	B	884,199
2,000	Iowa Higher Education Loan Authority, Private College Facility Revenue Bonds, Upper Iowa University Project, Refunding Series 2010, 5.750%, 9/01/30 (Pre-refunded 9/01/20)	9/20 at 100.00	N/R (5)	2,167,100
1,645	Iowa Tobacco Settlement Authority, Asset Backed Settlement Revenue Bonds, Series 2005C, 5.375%, 6/01/38	9/18 at 100.00	B+	1,648,899
1,000	Iowa Tobacco Settlement Authority, Tobacco Asset-Backed Revenue Bonds, Series 2005B, 5.600%, 6/01/34	9/18 at 100.00	BB-	1,009,690
6,185	Total Iowa			6,455,977
	Kansas – 0.1%
230	Overland Park Development Corporation, Kansas, Second Tier Revenue Bonds, Overland Park Convention Center, Series 2007B, 5.125%, 1/01/22 – AMBAC Insured	9/18 at 100.00	BB+	230,345

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Kentucky – 1.3%
$ 2,500	Kentucky Economic Development Finance Authority, Hospital Revenue Bonds, Baptist Healthcare System Obligated Group, Series 2011, 5.250%, 8/15/46	8/21 at 100.00	A	$2,627,275
805	Kentucky Public Transportation Infrastructure Authority, First Tier Toll Revenue Bonds, Downtown Crossing Project, Convertible Capital Appreciation Series 2013C, 0.000%, 7/01/43 (4)	7/31 at 100.00	Baa3	757,038
3,305	Total Kentucky			3,384,313
	Louisiana – 0.8%
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	2,149,808
	Maryland – 0.4%
1,000	Maryland Health and Higher Educational Facilities Authority, Revenue Bonds, Johns Hopkins Health System Obligated Group Issue, Series 2012B, 5.000%, 7/01/27	7/22 at 100.00	AA-	1,115,030
	Massachusetts – 2.8%
2,200	Massachusetts Bay Transportation Authority, Assessment Bonds, Series 2012A, 5.000%, 7/01/41	7/22 at 100.00	AAA	2,414,874
1,675	Massachusetts Development Finance Agency, Revenue Bonds, Olin College, Series 2013E, 5.000%, 11/01/43	11/23 at 100.00	A+	1,844,812
2,250	Massachusetts Development Finance Agency, Revenue Bonds, Partners HealthCare System, Series 2014M-4, 5.000%, 7/01/44	7/23 at 100.00	AA-	2,459,475
400	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-	390,060
6,525	Total Massachusetts			7,109,221
	Michigan – 0.4%
355	Detroit Water and Sewerage Department, Michigan, Sewage Disposal System Revenue Bonds, Refunding Senior Lien Series 2012A, 5.250%, 7/01/39	7/22 at 100.00	A	381,810
385	Michigan State Building Authority, Revenue Bonds, Facilities Program, Refunding Series 2015-I, 5.000%, 4/15/38	10/25 at 100.00	Aa2	433,148
250	Royal Oak Hospital Finance Authority, Michigan, Hospital Revenue Bonds, William Beaumont Hospital, Refunding Series 2009V, 8.250%, 9/01/39 (Pre-refunded 9/01/18)	9/18 at 100.00	Aaa (5)	252,737
990	Total Michigan			1,067,695
	Mississippi – 0.5%
1,170	Warren County, Mississippi, Gulf Opportunity Zone Revenue Bonds, International Paper Company Project, Series 2008A, 6.500%, 9/01/32	9/18 at 100.00	BBB	1,179,103
	Missouri – 0.1%
270	Bi-State Development Agency of the Missouri-Illinois Metropolitan District, Mass Transit Sales Tax Appropriation Bonds, Refunding Combined Lien Series 2013A, 5.000%, 10/01/28	10/18 at 100.00	AA+	272,403
	Nebraska – 0.9%
545	Douglas County Hospital Authority 3, Nebraska, Health Facilities Revenue Bonds, Nebraska Methodist Health System, Refunding Series 2015, 4.125%, 11/01/36	11/25 at 100.00	A-	559,371

NXQ	Nuveen Select Tax-Free Income Portfolio 2 (continued)
	Portfolio of Investments June 30, 2018
	(Unaudited)

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Nebraska (continued)
$ 305	Madison County Hospital Authority 1, Nebraska, Hospital Revenue Bonds, Faith Regional Health Services Project, Series 2018, 5.000%, 7/01/27	7/25 at 100.00	BBB	$335,549
1,000	Nebraska Public Power District, General Revenue Bonds, Series 2015A-2, 5.000%, 1/01/40	1/22 at 100.00	A+	1,076,210
500	Southeast Community College Area, Nebraska, Certificates of Participation, Series 2018, 3.500%, 12/15/42	6/28 at 100.00	Aa1	487,140
2,350	Total Nebraska			2,458,270
	Nevada – 4.3%
990	Carson City, Nevada, Hospital Revenue Bonds, Carson Tahoe Regional Healthcare Project, Series 2017A, 5.000%, 9/01/37	9/27 at 100.00	BBB+	1,099,751
1,325	Clark County Water Reclamation District, Nevada, General Obligation Water Bonds, Series 2009A, 5.250%, 7/01/38 (Pre-refunded 7/01/19)	7/19 at 100.00	AAA (5)	1,373,058
1,250	Clark County, Nevada, Airport Revenue Bonds, Tender Option Bond Trust Series 2016-XG0028, 16.163%, 7/01/42, 144A (IF)	1/20 at 100.00	Aa3	1,554,438
1,000	Clark County, Nevada, Passenger Facility Charge Revenue Bonds, Las Vegas-McCarran International Airport, Series 2010A, 5.250%, 7/01/42	1/20 at 100.00	Aa3	1,050,800
3,000	Las Vegas Valley Water District, Nevada, General Obligation Bonds, Refunding Series 2015, 5.000%, 6/01/34	12/24 at 100.00	AA+	3,399,870
2,500	North Las Vegas, Nevada, General Obligation Bonds, Series 2006, 5.000%, 5/01/36 – NPFG Insured	9/18 at 100.00	BBB	2,501,750
10,065	Total Nevada			10,979,667
	New Jersey – 3.1%
2,000	New Jersey Economic Development Authority, School Facilities Construction Bonds, Refunding Series 2016BBB, 5.500%, 6/15/31	12/26 at 100.00	A-	2,270,020
2,165	New Jersey Economic Development Authority, School Facilities Construction Financing Program Bonds, Refunding Series 2011GG, 5.000%, 9/01/22	3/21 at 100.00	A-	2,289,098
1,250	New Jersey Economic Development Authority, School Facility Construction Bonds, Series 2005K, 5.500%, 12/15/19 – AMBAC Insured	No Opt. Call	A-	1,310,737
2,000	New Jersey Transportation Trust Fund Authority, Transportation System Bonds, Series 2015AA, 5.250%, 6/15/29	6/25 at 100.00	A-	2,196,120
7,415	Total New Jersey			8,065,975
	New Mexico – 1.1%
800	New Mexico Hospital Equipment Loan Council, First Mortgage Revenue Bonds, Haverland Carter Lifestyle Group, Series 2013, 5.000%, 7/01/42	7/22 at 100.00	BBB	834,664
1,000	New Mexico Mortgage Finance Authority, Multifamily Housing Revenue Bonds, St Anthony, Series 2007A, 5.250%, 9/01/42 (Alternative Minimum Tax)	9/18 at 100.00	N/R	1,000,570
1,000	New Mexico Municipal Energy Acquisition Authority, Gas Supply Revenue Bonds, Refunding Sub-Series 2014A, 5.000%, 11/01/39 (Mandatory Put 8/01/19)	8/19 at 100.00	Aa2	1,034,210
2,800	Total New Mexico			2,869,444

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	New York – 1.6%
	Hudson Yards Infrastructure Corporation, New York, Revenue Bonds, Senior Fiscal 2012 Series 2011A:
$ 25	5.250%, 2/15/47 (Pre-refunded 2/15/21)	2/21 at 100.00	Aa3 (5)	$27,235
475	5.250%, 2/15/47	2/21 at 100.00	AA-	510,501
1,250	Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Refunding Series 2012F, 5.000%, 11/15/26	11/22 at 100.00	AA-	1,389,975
1,005	New York City Transitional Finance Authority, New York, Building Aid Revenue Bonds, Fiscal Series 2009-S1, 5.500%, 7/15/31	7/18 at 100.00	AA	1,007,894
1,135	Port Authority of New York and New Jersey, Special Project Bonds, JFK International Air Terminal LLC Project, Eighth Series 2010, 6.000%, 12/01/42	12/20 at 100.00	Baa1	1,244,142
3,890	Total New York			4,179,747
	Ohio – 2.8%
	Buckeye Tobacco Settlement Financing Authority, Ohio, Tobacco Settlement Asset-Backed Revenue Bonds, Senior Lien, Series 2007A-2:
2,475	5.875%, 6/01/30	8/18 at 100.00	B-	2,487,375
875	5.750%, 6/01/34	8/18 at 100.00	B-	876,094
2,115	5.875%, 6/01/47	8/18 at 100.00	B-	2,124,052
1,105	Ohio Turnpike Commission, Turnpike Revenue Bonds, Infrastructure Project, Junior Lien Series 2013A-1, 5.000%, 2/15/48	2/23 at 100.00	Aa3	1,201,566
1,000	Ohio Water Development Authority, Pollution Control Revenue Refunding Bonds, FirstEnergy Nuclear Generating Corporation Project, Series 2005B, 4.000%, 1/01/34 (Mandatory Put 7/01/21) (6)	No Opt. Call	N/R	500,000
7,570	Total Ohio			7,189,087
	Oklahoma – 0.2%
450	Oklahoma Development Finance Authority, Health System Revenue Bonds, OU Medicine Project, Series 2018B, 5.000%, 8/15/38	8/28 at 100.00	Baa3	501,795
	Oregon – 1.1%
915	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+	1,063,147
60	Clackamas Community College District, Oregon, General Obligation Bonds, Deferred Interest Series 2017A, 0.000%, 6/15/40 (4)	6/27 at 100.00	Aa1	62,277
500	Lake Oswego, Oregon, General Obligation Bonds, Series 2013, 5.000%, 6/01/26	6/23 at 100.00	AAA	566,820
1,090	Oregon Facilities Authority, Revenue Bonds, Reed College, Series 2017A, 4.000%, 7/01/41	7/27 at 100.00	Aa2	1,143,759
2,565	Total Oregon			2,836,003
	Pennsylvania – 4.3%
1,255	Delaware River Port Authority, New Jersey and Pennsylvania, Revenue Bonds, Series 2013, 5.000%, 1/01/37	1/24 at 100.00	A	1,384,616
2,250	Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, Carnegie Mellon University, Series 2009, 5.000%, 8/01/21	2/19 at 100.00	AA	2,292,997

NXQ	Nuveen Select Tax-Free Income Portfolio 2 (continued)
	Portfolio of Investments June 30, 2018
	(Unaudited)

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Pennsylvania (continued)
	Pennsylvania Turnpike Commission, Motor License Fund-Enhanced Subordinate Special Revenue Bonds, Series 2010B-2:
$ 555	5.000%, 12/01/30 (Pre-refunded 12/01/20)	12/20 at 100.00	N/R (5)	$597,125
300	5.000%, 12/01/30 (Pre-refunded 12/01/20)	12/20 at 100.00	N/R (5)	321,663
645	5.000%, 12/01/30 (Pre-refunded 12/01/20)	12/20 at 100.00	A2 (5)	693,956
2,970	Philadelphia, Pennsylvania, Water and Wastewater Revenue Bonds, Series 2015A, 5.000%, 7/01/40	7/24 at 100.00	A+	3,309,174
2,500	State Public School Building Authority, Pennsylvania, School Revenue Bonds, Harrisburg School District, Refunding Series 2009A, 4.750%, 11/15/29 (Pre-refunded 5/15/19) – AGC Insured	5/19 at 100.00	AA (5)	2,568,125
10,475	Total Pennsylvania			11,167,656
	Puerto Rico – 0.4%
1,035	Puerto Rico Housing Finance Authority, Capital Fund Program Revenue Bonds, Series 2003, 5.000%, 12/01/20	9/18 at 100.00	AA-	1,078,977
	South Carolina – 1.9%
1,500	Richland County School District 2, South Carolina, General Obligation Bonds, Refunding Series 2012B., 3.050%, 5/01/27	5/23 at 100.00	Aa1	1,518,825
3,400	South Carolina Public Service Authority, Revenue Obligation Bonds, Santee Cooper Electric System, Series 2008A, 5.500%, 1/01/38 (Pre-refunded 1/01/19) – BHAC Insured	1/19 at 100.00	AA+ (5)	3,468,272
4,900	Total South Carolina			4,987,097
	South Dakota – 0.3%
600	South Dakota Health and Educational Facilities Authority, Revenue Bonds, Sanford Health, Series 2015, 5.000%, 11/01/35	11/25 at 100.00	A+	668,364
	Tennessee – 0.9%
2,020	Metropolitan Nashville Airport Authority, Tennessee, Airport Revenue Bonds, Improvement Series 2015A, 5.000%, 7/01/45	7/25 at 100.00	A+	2,266,420
	Texas – 10.3%
250	Central Texas Regional Mobility Authority, Revenue Bonds, Senior Lien Series 2011, 6.000%, 1/01/41 (Pre-refunded 1/01/21)	1/21 at 100.00	BBB+ (5)	274,535
240	Central Texas Regional Mobility Authority, Revenue Bonds, Senior Lien, Series 2015A, 5.000%, 1/01/35	7/25 at 100.00	BBB+	264,667
2,000	Dallas Area Rapid Transit, Texas, Sales Tax Revenue Bonds, Senior Lien Series 2008, 5.250%, 12/01/48 (Pre-refunded 12/01/18)	12/18 at 100.00	AA+ (5)	2,031,420
5,560	Grand Parkway Transportation Corporation, Texas, System Toll Revenue Bonds, First Tier Series 2013A, 5.500%, 4/01/53	10/23 at 100.00	A-	6,229,591
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	1,286,997
1,250	Harris County Flood Control District, Texas, Contract Tax Bonds, Refunding Series 2017A, 4.000%, 10/01/35	10/27 at 100.00	AAA	1,324,287

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:
$ 630	0.000%, 11/15/24 – NPFG Insured	No Opt. Call	Baa2	$503,553
12,480	0.000%, 11/15/41 – NPFG Insured	11/31 at 53.78	Baa2	3,805,651
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	A2	485,352
2,255	Love Field Airport Modernization Corporation, Texas, Special Facilities Revenue Bonds, Southwest Airlines Company, Series 2010, 5.250%, 11/01/40	11/20 at 100.00	A3	2,401,169
1,025	North Texas Tollway Authority, System Revenue Bonds, Refunding First Tier, Series 2015B, 5.000%, 1/01/40	1/23 at 100.00	A1	1,116,440
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-	203,508
5,000	Texas Municipal Gas Acquisition and Supply Corporation III, Gas Supply Revenue Bonds, Series 2012, 5.000%, 12/15/26	12/22 at 100.00	A3	5,472,500
2,000	Wylie Independent School District, Collin County, Texas, General Obligation Bonds, School Building Series 2010, 0.000%, 8/15/31	No Opt. Call	AAA	1,089,940
34,625	Total Texas			26,489,610
	Virginia – 1.8%
1,500	Metropolitan Washington Airports Authority, Virginia, Dulles Toll Road Second Senior Lien Revenue Bonds, Series 2009C, 6.500%, 10/01/41 – AGC Insured	10/26 at 100.00	AA	1,900,935
	Virginia Small Business Financing Authority, Senior Lien Revenue Bonds, Elizabeth River Crossing, Opco LLC Project, Series 2012:
1,000	5.250%, 1/01/32 (Alternative Minimum Tax)	7/22 at 100.00	BBB	1,080,970
410	6.000%, 1/01/37 (Alternative Minimum Tax)	7/22 at 100.00	BBB	454,186
1,010	5.500%, 1/01/42 (Alternative Minimum Tax)	7/22 at 100.00	BBB	1,092,911
3,920	Total Virginia			4,529,002
	Washington – 3.7%
855	Port of Seattle, Washington, Revenue Bonds, Refunding First Lien Series 2016A, 5.000%, 10/01/19	No Opt. Call	Aa2	890,329
860	Snohomish County School District 306 Lakewood, Washington, General Obligation Bonds, Series 2014, 5.000%, 12/01/28	6/24 at 100.00	Aa1	986,093
4,000	Washington Health Care Facilities Authority, Revenue Bonds, Catholic Health Initiative, Series 2013A, 5.750%, 1/01/45	1/23 at 100.00	BBB+	4,381,720
990	Washington Health Care Facilities Authority, Revenue Bonds, Fred Hutchinson Cancer Research Center, Series 2011A, 5.625%, 1/01/35	1/21 at 100.00	A+	1,055,449
2,185	Washington State Health Care Facilities Authority, Revenue Bonds, PeaceHealth, Refunding Series 2009, 5.000%, 11/01/28	11/19 at 100.00	A+	2,266,020
8,890	Total Washington			9,579,611
	Wisconsin – 2.9%
2,000	Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Gundersen Lutheran, Series 2011A, 5.250%, 10/15/39	10/21 at 100.00	AA-	2,151,300
2,355	Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Medical College of Wisconsin, Inc., Series 2016, 5.000%, 12/01/41	11/26 at 100.00	AA-	2,642,522

NXQ	Nuveen Select Tax-Free Income Portfolio 2 (continued)
	Portfolio of Investments June 30, 2018
	(Unaudited)

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Wisconsin (continued)
$ 1,645	Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Mercy Alliance, Inc., Series 2012, 5.000%, 6/01/39	6/22 at 100.00	A3	$1,745,542
1,000	Wisconsin State, General Fund Annual Appropriation Revenue Bonds, Refunding Series 2009A, 6.000%, 5/01/36 (Pre-refunded 5/01/19)	5/19 at 100.00	Aa2 (5)	1,037,110
7,000	Total Wisconsin			7,576,474
$ 287,720	Total Municipal Bonds (cost $235,822,466)			256,134,850

Principal Amount (000)	Description (1)	Coupon	Maturity	Ratings (3)	Value
	CORPORATE BONDS – 0.1%
	Transportation – 0.1%
$ 316	Las Vegas Monorail Company, Senior Interest Bonds (7), (8)	5.500%	7/15/19	N/R	$203,926
87	Las Vegas Monorail Company, Senior Interest Bonds (7), (8)	5.500%	7/15/55	N/R	43,858
$ 403	Total Corporate Bonds (cost $24,528)				247,784

	Total Long-Term Investments (cost $235,846,994)				256,382,634
	Other Assets Less Liabilities – 0.6%				1,628,862
	Net Assets – 100%				$ 258,011,496

Fair Value Measurements

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. A three-tier hierarchy 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 the reporting entity’s own 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, prepayment speeds, credit risk, etc.).

Level 3 – Prices are determined using significant unobservable inputs (including management’s assumptions in determining the fair value of investments).

The inputs or methodologies used for valuing securities are not an indication of the risks associated with investing in those securities. The following is a summary of the Fund’s fair value measurements as of the end of the reporting period:

	Level 1	Level 2	Level 3	Total
Long-Term Investments:
Municipal Bonds	$ —	$256,134,850	$ —	$256,134,850
Corporate Bonds	—	—	247,784	247,784
Total	$ —	$256,134,850	$247,784	$256,382,634

Income Tax Information

The following information is presented on an income tax basis. Differences between amounts for financial statement and federal income tax purposes are primarily due to timing differences in recognizing taxable market discount, timing differences in recognizing certain gains and losses on investment transactions and the treatment of investments in inverse floating rate securities reflected as financing transactions, if any. To the extent that differences arise that are permanent in nature, such amounts are reclassified within the capital accounts on the Statement of Assets and Liabilities presented in the annual report, based on their federal tax basis treatment; temporary differences do not require reclassification. Temporary and permanent differences do not impact the net asset value of the Fund.

The table below presents the cost and unrealized appreciation (depreciation) of the Fund's investment portfolio, as determined on a federal income tax basis, as of June 30, 2018.

Tax cost of investments	$234,874,927
Gross unrealized:
Appreciation	$ 22,478,624
Depreciation	(970,917)
Net unrealized appreciation (depreciation) of investments	$ 21,507,707

(1)	All percentages shown in the Portfolio of Investments are based on net assets.
(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)	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.
(5)	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.
(6)	As of, or subsequent to, the end of the reporting period, this security is non-income producing. Non-income producing, in the case of a fixed-income security, generally denotes that the issuer has (1) defaulted on the payment of principal or interest, (2) is under the protection of the Federal Bankruptcy Court or (3) the Fund’s Adviser has concluded that the issue is not likely to meet its future interest payment obligations and has ceased accruing additional income on the Fund’s records.
(7)	During January 2010, Las Vegas Monorail Company (“Las Vegas Monorail”) filed for federal bankruptcy protection. During March 2012, Las Vegas Monorail emerged from federal bankruptcy with the acceptance of a reorganization plan assigned by the Federal Bankruptcy Court. Under the reorganization plan, the Fund surrendered its Las Vegas Monorail Project Revenue Bonds, First Tier, Series 2000 and in turn received two senior interest corporate bonds: the first with an annual coupon rate of 5.500% maturing on July 15, 2019 and the second with an annual coupon rate of 3.000% (5.500% after December 31, 2015) maturing on July 15, 2055. The Fund was not accruing income for either senior interest corporate bond. On January 18, 2017, the Fund's Adviser determined it was likely that this senior interest corporate bond would fulfill its obligation on the security maturing on July 15, 2019, and therefore began accruing income on the Fund's records.
(8)	Investment valued at fair value using methods determined in good faith by, or at the discretion of the Board. For fair value measurement disclosure purposes, investment classified as Level 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.
ETM	Escrowed to maturity.
IF	Inverse floating rate security issued by a tender option bond (“TOB”) trust, the interest rate on which varies inversely with the Securities Industry Financial Markets Association (SIFMA) short-term rate, which resets weekly, or a similar short-term rate, and is reduced by the expenses related to the TOB trust.

Item 2. Controls and Procedures.

The registrant’s principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”) (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).

There were no changes in the registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the registrant’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 3. Exhibits.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: See EX-99 CERT attached hereto.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.


(Registrant)		Nuveen Select Tax-Free Income Portfolio 2

By (Signature and Title)		/s/ Gifford R. Zimmerman
		Gifford R. Zimmerman
		Vice President and Secretary

Date: August 29, 2018

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.


By (Signature and Title)		/s/ Cedric H. Antosiewicz
		Cedric H. Antosiewicz
		Chief Administrative Officer (principal executive officer)

Date: August 29, 2018

By (Signature and Title)		/s/ Stephen D. Foy
		Stephen D. Foy
		Vice President and Controller (principal financial officer)

Date: August 29, 2018