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 811-07056

Nuveen Select Maturities Municipal Fund

(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: December 31, 2017

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

NIM

Nuveen Select Maturities Municipal Fund

Portfolio of Investments December 31, 2017 (Unaudited)

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	LONG-TERM INVESTMENTS – 99.0%
	MUNICIPAL BONDS – 99.0%
	Alabama – 0.8%
$ 500	Black Belt Energy Gas District, Alabama, Gas Supply Revenue Bonds, Series 2016A, 4.000%, 7/01/46 (Mandatory Put 6/01/21)	3/21 at 100.59	A1	$530,090
350	Black Belt Energy Gas District, Alabama, Gas Supply Revenue Bonds, Series 2017A, 4.000%, 8/01/47 (Mandatory Put 7/01/22)	4/22 at 100.52	A1	376,974
125	Mobile Spring Hill College Educational Building Authority, Alabama, Revenue Bonds, Spring Hill College Project, Series 2015, 5.000%, 4/15/27	4/25 at 100.00	N/R	129,699
975	Total Alabama			1,036,763
	Alaska – 0.2%
100	Alaska Industrial Development and Export Authority, Loan Anticipation Revenue Notes, YKHC Project, Series 2017, 3.500%, 12/01/20	12/19 at 100.00	N/R	101,684
155	Alaska State, Sport Fishing Revenue Bonds, Refunding Series 2011, 5.000%, 4/01/21	4/20 at 100.00	A1	166,036
255	Total Alaska			267,720
	Arizona – 3.1%
	Arizona Health Facilities Authority, Hospital System Revenue Bonds, Phoenix Children's Hospital, Refunding Series 2012A:
275	5.000%, 2/01/20	No Opt. Call	BBB+	291,277
290	5.000%, 2/01/27	2/22 at 100.00	BBB+	319,000
	Arizona Sports and Tourism Authority, Tax Revenue Bonds, Multipurpose Stadium Facility Project, Refunding Senior Series 2012A:
425	5.000%, 7/01/25	7/22 at 100.00	A1	469,714
685	5.000%, 7/01/26	7/22 at 100.00	A1	755,843
685	5.000%, 7/01/27	7/22 at 100.00	A1	753,089
120	Phoenix Industrial Development Authority, Arizona, Education Facility Revenue Bonds, Legacy Traditional Schools East Mesa and Cadence, Nevada Campuses, Series 2017A, 4.000%, 7/01/22, 144A	7/19 at 101.00	N/R	118,254
115	Pima County Industrial Development Authority, Arizona, Revenue Bonds, Tucson Electric Power Company Project, Series 2013A, 4.000%, 9/01/29	3/23 at 100.00	A-	122,212
	Salt Verde Financial Corporation, Arizona, Senior Gas Revenue Bonds, Citigroup Energy Inc. Prepay Contract Obligations, Series 2007:
135	5.250%, 12/01/19	No Opt. Call	BBB+	143,158
200	5.000%, 12/01/32	No Opt. Call	BBB+	245,092
705	5.000%, 12/01/37	No Opt. Call	BBB+	883,619
3,635	Total Arizona			4,101,258
	Arkansas – 0.4%
540	Independence County, Arkansas, Pollution Control Revenue Bonds, Arkansas Power and Light Company Project, Series 2013, 2.375%, 1/01/21	No Opt. Call	A	547,430

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	California – 5.9%
$ 300	Alameda Corridor Transportation Authority, California, Revenue Bonds, Refunding Senior Lien Series 2013A, 5.000%, 10/01/23	No Opt. Call	A	$353,595
390	California Health Facilities Financing Authority, Revenue Bonds, El Camino Hospital, Series 2017, 3.750%, 2/01/32	2/27 at 100.00	A+	407,417
275	California Municipal Finance Authority, Charter School Revenue Bonds, Palmdale Aerospace Academy Project, Series 2016A, 5.000%, 7/01/31, 144A	7/26 at 100.00	BB	289,979
105	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Waste Management Inc., Refunding Series 2015B-2, 3.125%, 11/01/40 (Alternative Minimum Tax) (Mandatory Put 11/03/25)	No Opt. Call	A-	109,792
290	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Waste Management Inc., Series 2015A-1, 3.375%, 7/01/25 (Alternative Minimum Tax)	No Opt. Call	A-	309,082
205	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Waste Management, Inc. Project, Refunding Series 2015B-1, 3.000%, 11/01/25 (Alternative Minimum Tax)	No Opt. Call	A-	213,130
525	California State, General Obligation Bonds, Various Purpose Series 2010, 5.500%, 3/01/40	3/20 at 100.00	AA-	565,976
125	California Statewide Communities Development Authority, California, Revenue Bonds, Loma Linda University Medical Center, Series 2014A, 5.250%, 12/01/29	12/24 at 100.00	BB	141,351
250	Delano, California, Certificates of Participation, Delano Regional Medical Center, Series 2012, 5.000%, 1/01/24	1/23 at 100.00	BBB	269,303
145	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed Bonds, Series 2007A-1, 5.000%, 6/01/33	3/18 at 100.00	B+	145,003
100	Lake Elsinore Public Financing Authority, California, Local Agency Revenue Bonds, Canyon Hills Improvement Area A & C, Series 2014C, 5.000%, 9/01/32	9/24 at 100.00	N/R	112,183
325	Lake Elsinore Redevelopment Agency, California, Special Tax Bonds, Community Facilities District 90-2, Series 2007A, 4.500%, 10/01/24  –  AGM Insured	3/18 at 100.00	AA	325,699
1,000	Mount San Antonio Community College District, Los Angeles County, California, General Obligation Bonds, Election of 2008, Series 2013A, 0.000%, 8/01/28 (4)	2/28 at 100.00	Aa1	985,760
2,000	Palomar Pomerado Health, California, General Obligation Bonds, Series 2009A, 0.000%, 8/01/25  –  AGC Insured	No Opt. Call	AA	1,644,440
35	Riverside County Transportation Commission, California, Toll Revenue Senior Lien Bonds, Series 2013A, 5.750%, 6/01/44	6/23 at 100.00	BBB-	39,457
2,000	San Diego Community College District, California, General Obligation Bonds, Refunding Series 2011, 0.000%, 8/01/37	No Opt. Call	Aaa	1,066,000
415	San Joaquin Hills Transportation Corridor Agency, Orange County, California, Toll Road Revenue Bonds, Refunding Senior Lien Series 2014A, 5.000%, 1/15/29	1/25 at 100.00	BBB	484,737
215	Washington Township Health Care District, California, Revenue Bonds, Refunding Series 2015A, 5.000%, 7/01/25	No Opt. Call	Baa1	250,727
8,700	Total California			7,713,631
	Colorado – 2.1%
750	Colorado Bridge Enterprise, Revenue Bonds, Central 70 Project, Senior Series 2017, 4.000%, 6/30/30 (Alternative Minimum Tax)	12/27 at 100.00	A-	811,657
250	Colorado Health Facilities Authority, Colorado, Revenue Bonds, Catholic Health Initiatives, Series 2008D-3, 5.000%, 10/01/38 (Mandatory Put 11/12/21)	No Opt. Call	BBB+	274,487
	E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2000B:
300	0.000%, 9/01/29  –  NPFG Insured	No Opt. Call	A-	210,294
250	0.000%, 9/01/33  –  NPFG Insured	No Opt. Call	A-	149,503

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Colorado (continued)
$ 5	E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2007A-1, 5.250%, 9/01/18  –  NPFG Insured	No Opt. Call	A-	$5,122
1,000	E-470 Public Highway Authority, Colorado, Toll Revenue Bonds, Series 2004B, 0.000%, 3/01/36  –  NPFG Insured	9/20 at 41.72	A-	387,760
500	Plaza Metropolitan District 1, Lakewood, Colorado, Tax Increment Revenue Bonds, Refunding Series 2013, 5.000%, 12/01/20, 144A	No Opt. Call	N/R	533,135
210	Regional Transportation District, Colorado, Denver Transit Partners Eagle P3 Project Private Activity Bonds, Series 2010, 6.000%, 1/15/41	7/20 at 100.00	BBB+	229,883
100	Southlands Metropolitan District 1, Colorado, Limited Tax General Obligation Bonds, Series 2017A-1, 3.500%, 12/01/27	No Opt. Call	Ba1	100,068
3,365	Total Colorado			2,701,909
	Connecticut – 2.5%
100	Connecticut Health and Educational Facilities Authority, Revenue Bonds, Healthcare Facility Expansion Church Home of Hartford Inc. Project, TEMPS-50 Series 2016B-2, 2.875%, 9/01/20, 144A	3/18 at 100.00	BB	100,028
905	Connecticut Health and Educational Facilities Authority, Revenue Bonds, Yale University, Series 2010A-3, 0.875%, 7/01/49 (Mandatory Put 5/08/18)	No Opt. Call	Aaa	904,584
2,000	Connecticut Health and Educational Facilities Authority, Revenue Bonds, Yale University, Series 2017C-2, 5.000%, 7/01/57	No Opt. Call	AAA	2,322,920
3,005	Total Connecticut			3,327,532
	Delaware – 0.2%
170	Delaware Health Facilities Authority, Revenue Bonds, Nanticoke Memorial Hospital, Series 2013, 5.000%, 7/01/28	7/23 at 100.00	BBB	189,179
	District of Columbia – 0.9%
120	District of Columbia Student Dormitory Revenue Bonds, Provident Group - Howard Properties LLC Issue, Series 2013, 5.000%, 10/01/30	10/22 at 100.00	BB+	124,135
935	District of Columbia Tobacco Settlement Corporation, Tobacco Settlement Asset-Backed Bonds, Series 2001, 6.500%, 5/15/33	No Opt. Call	BBB	1,063,534
1,055	Total District of Columbia			1,187,669
	Florida – 3.5%
295	Cape Coral, Florida, Utility Improvement Assessment Bonds, Refunding Various Areas Series 2017, 3.000%, 9/01/28  –  AGM Insured	No Opt. Call	AA	294,994
	Citizens Property Insurance Corporation, Florida, Coastal Account Senior Secured Bonds, Series 2015A-1:
555	5.000%, 6/01/22	12/21 at 100.00	AA	619,102
365	5.000%, 6/01/25	12/24 at 100.00	AA	431,470
200	Citizens Property Insurance Corporation, Florida, High-Risk Account Revenue Bonds, Coastal Account Senior Secured Series 2011A-1, 5.000%, 6/01/18	No Opt. Call	AA	202,864
	Citizens Property Insurance Corporation, Florida, Personal and Commercial Lines Account Bonds, Senior Secured Series 2012A-1:
50	5.000%, 6/01/18	No Opt. Call	AA	50,716
455	5.000%, 6/01/20	No Opt. Call	AA	488,524

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Florida (continued)
	Collier County Educational Facilities Authority, Florida, Revenue Bonds, Hodges University, Refunding Series 2013:
$ 80	4.750%, 11/01/23	No Opt. Call	BBB-	$82,000
370	6.000%, 11/01/33	11/23 at 100.00	BBB-	393,477
640	Florida, Development Finance Corporation, Surface Transportation Facility Revenue Bonds, Brightline Passenger Rail Project - South Segment, Series 2017, 5.625%, 1/01/47 (Alternative Minimum Tax), 144A	1/19 at 105.00	BB-	667,558
	Miami-Dade County, Florida, Public Facilities Revenue Bonds, Jackson Health System, Series 2009:
10	5.500%, 6/01/29 (Pre-refunded 6/01/19)  –  AGM Insured	6/19 at 100.00	AA (5)	10,556
10	5.625%, 6/01/34 (Pre-refunded 6/01/19)  –  AGC Insured	6/19 at 100.00	AA (5)	10,574
480	North Sumter County Utility Dependent District, Florida, Utility Revenue Bonds, Series 2010, 5.000%, 10/01/20	No Opt. Call	A	508,306
90	Palm Beach County Health Facilities Authority, Florida, Hospital Revenue Bonds, BRCH Corporation Obligated Group, Refunding Series 2014, 5.000%, 12/01/31	12/24 at 100.00	BBB+	100,919
	Tampa, Florida, Cigarette Tax Allocation Bonds, H. Lee Moffitt Cancer Center Project, Refunding & Capital Improvement Series 2012A:
120	5.000%, 9/01/22	No Opt. Call	A+	135,952
350	5.000%, 9/01/23	9/22 at 100.00	A+	397,334
185	5.000%, 9/01/25	9/22 at 100.00	A+	209,313
4,255	Total Florida			4,603,659
	Georgia – 0.9%
180	Cherokee County Water and Sewerage Authority, Georgia, Revenue Bonds, Series 1995, 5.200%, 8/01/25 (Pre-refunded 8/01/22)  –  NPFG Insured	8/22 at 100.00	N/R (5)	193,757
900	Private Colleges and Universities Authority, Georgia, Revenue Bonds, Mercer University, Refunding Series 2012C, 5.250%, 10/01/23	10/22 at 100.00	Baa2	1,037,907
1,080	Total Georgia			1,231,664
	Guam – 0.3%
140	Guam Government Waterworks Authority, Water and Wastewater System Revenue Bonds, Series 2013, 5.500%, 7/01/43	7/23 at 100.00	BBB-	157,798
150	Guam International Airport Authority, Revenue Bonds, Series 2013C, 6.375%, 10/01/43 (Alternative Minimum Tax)	10/23 at 100.00	BBB	177,738
290	Total Guam			335,536
	Hawaii – 1.4%
200	Hawaii Department of Budget and Finance, Special Purpose Revenue Bonds, Hawaii Pacific University, Series 2013A, 6.250%, 7/01/27	7/23 at 100.00	BB	212,984
1,000	Hawaii Department of Budget and Finance, Special Purpose Revenue Bonds, Hawaiian Electric Company, Inc. and Subsidiary Projects, Series 2017A, 3.100%, 5/01/26 (Alternative Minimum Tax)	No Opt. Call	A-	1,026,620
20	Hawaii Department of Budget and Finance, Special Purpose Revenue Bonds, Queens Health Systems, Series 2015A, 5.000%, 7/01/29	7/25 at 100.00	AA-	23,562
510	Hawaiian Electric Company Inc., Special Purpose Revenue Bonds, Department of Budget and Finance of the State of Hawaii, Series 2015, 3.250%, 1/01/25 (Alternative Minimum Tax)	No Opt. Call	A-	531,405
1,730	Total Hawaii			1,794,571

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Idaho – 0.4%
$ 565	Nez Perce County, Idaho, Pollution Control Revenue Bonds, Potlatch Corporation Project, Refunding Series 2016, 2.750%, 10/01/24, 144A	No Opt. Call	BB+	$ 564,294
	Illinois – 16.3%
	Cary, Illinois, Special Tax Bonds, Special Service Area 1, Refunding Series 2016:
10	2.150%, 3/01/23  –  BAM Insured	No Opt. Call	AA	9,770
10	2.350%, 3/01/24  –  BAM Insured	No Opt. Call	AA	9,858
25	2.700%, 3/01/26  –  BAM Insured	3/25 at 100.00	AA	24,674
25	2.900%, 3/01/28  –  BAM Insured	3/25 at 100.00	AA	24,134
25	3.050%, 3/01/30  –  BAM Insured	3/25 at 100.00	AA	24,649
	Cary, Illinois, Special Tax Bonds, Special Service Area 2, Refunding Series 2016:
15	2.150%, 3/01/23  –  BAM Insured	No Opt. Call	AA	14,655
15	2.350%, 3/01/24  –  BAM Insured	No Opt. Call	AA	14,788
25	2.700%, 3/01/26  –  BAM Insured	3/25 at 100.00	AA	24,674
35	2.900%, 3/01/28  –  BAM Insured	3/25 at 100.00	AA	34,303
40	3.050%, 3/01/30  –  BAM Insured	3/25 at 100.00	AA	39,280
1,215	Chicago Board of Education, Illinois, Dedicated Capital Improvement Tax Revenue Bonds, Series 2016, 6.000%, 4/01/46	4/27 at 100.00	A	1,452,532
750	Chicago Board of Education, Illinois, General Obligation Bonds, Dedicated Revenues, Refunding Series 2017B, 6.750%, 12/01/30, 144A	12/27 at 100.00	B	916,672
290	Chicago Board of Education, Illinois, General Obligation Bonds, Dedicated Revenues, Refunding Series 2017C, 5.000%, 12/01/30	12/27 at 100.00	BB-	300,542
200	Chicago Board of Education, Illinois, General Obligation Bonds, Dedicated Revenues, Refunding Series 2017D, 5.000%, 12/01/31	12/27 at 100.00	B	207,108
300	Chicago, Illinois, General Airport Revenue Bonds, O'Hare International Airport, Senior Lien Refunding Series 2015A, 5.000%, 1/01/33 (Alternative Minimum Tax)	1/25 at 100.00	A	340,233
75	Chicago, Illinois, General Obligation Bonds, Project and Refunding Series 2009C, 5.000%, 1/01/27	1/19 at 100.00	BBB+	76,451
	Chicago, Illinois, General Obligation Bonds, Refunding Series 2016C:
200	5.000%, 1/01/23	No Opt. Call	BBB+	218,134
225	5.000%, 1/01/24	No Opt. Call	BBB-	246,931
190	5.000%, 1/01/25	No Opt. Call	BBB-	209,903
55	5.000%, 1/01/26	No Opt. Call	BBB-	61,074
325	Cook County, Illinois, General Obligation Bonds, Refunding Series 2012C, 5.000%, 11/15/21	No Opt. Call	AA-	360,204
185	Cook County, Illinois, General Obligation Bonds, Refunding Series 2016A, 5.000%, 11/15/20	No Opt. Call	AA-	200,869
590	Huntley, Illinois, Special Tax Bonds, Special Service Area 10, Refunding Series 2017, 3.300%, 3/01/28  –  BAM Insured	3/26 at 100.00	AA	595,882
625	Illinois Finance Authority, Gas Supply Refunding Revenue Bonds, The Peoples Gas Light and Coke Company Project, Series 2010B, 1.875%, 2/01/33 (Mandatory Put 8/01/20)	No Opt. Call	Aa3	631,694
455	Illinois Finance Authority, Revenue Bonds, Centegra Health System, Series 2012, 5.000%, 9/01/27	9/22 at 100.00	BBB-	494,084
560	Illinois Finance Authority, Revenue Bonds, Centegra Health System, Series 2014A, 4.625%, 9/01/39	9/24 at 100.00	BBB-	588,622

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Illinois (continued)
$ 275	Illinois Finance Authority, Revenue Bonds, Northwest Community Hospital, Series 2008A, 5.500%, 7/01/38 (Pre-refunded 7/01/18)	7/18 at 100.00	A (5)	$280,577
1,850	Illinois Finance Authority, Revenue Bonds, Presence Health Network, Series 2016C, 4.000%, 2/15/24	No Opt. Call	BBB	1,991,210
250	Illinois Finance Authority, Revenue Bonds, Roosevelt University, Series 2007, 5.250%, 4/01/22	3/18 at 100.00	Ba2	250,025
	Illinois State, General Obligation Bonds, February Series 2014:
370	5.000%, 2/01/25	2/24 at 100.00	BBB	398,668
325	5.000%, 2/01/26	2/24 at 100.00	BBB	349,632
	Illinois State, General Obligation Bonds, Refunding Series 2012:
390	5.000%, 8/01/20	No Opt. Call	BBB	409,301
335	5.000%, 8/01/21	No Opt. Call	BBB	354,876
1,000	5.000%, 8/01/22	No Opt. Call	BBB	1,068,590
320	5.000%, 8/01/23	No Opt. Call	BBB	344,291
300	Illinois State, General Obligation Bonds, Series 2012A, 4.000%, 1/01/20	No Opt. Call	BBB	306,000
	Illinois State, General Obligation Bonds, Series 2013:
280	5.500%, 7/01/25	7/23 at 100.00	BBB	309,392
240	5.500%, 7/01/26	7/23 at 100.00	BBB-	264,814
470	Illinois Toll Highway Authority, Toll Highway Revenue Bonds, Refunding Senior Lien Series 2016A, 5.000%, 12/01/31	1/26 at 100.00	AA-	551,319
450	Illinois Toll Highway Authority, Toll Highway Revenue Bonds, Senior Lien Series 2015B, 5.000%, 1/01/37	1/26 at 100.00	AA-	520,474
1,380	Kane & DeKalb Counties Community Unit School District 301, Illinois, General Obligation Bonds, Series 2006, 0.000%, 12/01/18  –  NPFG Insured	No Opt. Call	Aa2	1,356,057
1,000	Peoria Public Building Commission, Illinois, School District Facility Revenue Bonds, Peoria County School District 150 Project, Series 2009A, 0.000%, 12/01/22  –  AGC Insured	12/18 at 79.62	AA	784,280
	Railsplitter Tobacco Settlement Authority, Illinois, Tobacco Settlement Revenue Bonds, Series 2010:
725	5.000%, 6/01/19	No Opt. Call	A	758,727
1,025	5.250%, 6/01/21	No Opt. Call	A	1,141,471
220	Railsplitter Tobacco Settlement Authority, Illinois, Tobacco Settlement Revenue Bonds, Series 2017, 5.000%, 6/01/25	No Opt. Call	A	253,458
310	Regional Transportation Authority, Cook, DuPage, Kane, Lake, McHenry and Will Counties, Illinois, General Obligation Bonds, Series 1994D, 7.750%, 6/01/19  –  FGIC Insured	No Opt. Call	AA	326,166
	Southwestern Illinois Development Authority, Health Facility Revenue Bonds, Memorial Group, Inc., Series 2013:
50	7.250%, 11/01/33 (Pre-refunded 11/01/23)	11/23 at 100.00	N/R (5)	64,371
95	7.250%, 11/01/36 (Pre-refunded 11/01/23)	11/23 at 100.00	N/R (5)	122,304
200	7.625%, 11/01/48 (Pre-refunded 11/01/23)	11/23 at 100.00	N/R (5)	261,588
	Springfield, Illinois, Electric Revenue Bonds, Senior Lien Series 2015:
230	5.000%, 3/01/33	3/25 at 100.00	A	262,138
145	5.000%, 3/01/34  –  AGM Insured	3/25 at 100.00	AA	165,261
500	Sterling, Whiteside County, Illinois, General Obligation Bonds, Alternate Revenue Source, Series 2012, 4.000%, 11/01/22	No Opt. Call	A+	544,105

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Illinois (continued)
$ 355	Will, Grundy, Kendall, LaSalle, Kankakee, Livingston and Cook Counties Community College District 525 Joliet Junior College, Illinois, General Obligation Bond, Series 2008, 5.750%, 6/01/28	6/18 at 100.00	AA	$360,339
390	Williamson & Johnson Counties Community Unit School District 2, Marion, Illinois, Limited Tax General Obligation Lease Certificates, Series 2011, 7.000%, 10/15/22	10/19 at 103.00	BBB+	414,675
19,945	Total Illinois			21,335,829
	Indiana – 2.0%
115	Indiana Finance Authority, Educational Facilities Revenue Bonds, Drexel Foundation For Educational Excellence, Inc., Series 2009A, 6.000%, 10/01/21	10/19 at 100.00	B-	116,371
140	Indianapolis, Indiana, Thermal Energy System Revenue Bonds, Refunding First Lien Series 2014A, 5.000%, 10/01/31	10/24 at 100.00	A	159,265
255	Jasper County, Indiana, Pollution Control Revenue Refunding Bonds, Northern Indiana Public Service Company Project, Series 1994A Remarketed, 5.850%, 4/01/19  –  NPFG Insured	No Opt. Call	A3	267,217
250	Lake County Building Corporation, Indiana, First Mortgage Bonds, Series 2012, 4.750%, 2/01/21	No Opt. Call	N/R	258,963
250	Vanderburgh County, Indiana, Redevelopment District Tax Increment Revenue bonds, Refunding Series 2014, 5.000%, 2/01/29	8/24 at 100.00	A	288,835
865	Whiting, Indiana, Environmental Facilities Revenue Bonds, BP Products North America Inc. Project, Series 2008, 1.850%, 6/01/44 (Mandatory Put 10/01/19)	No Opt. Call	A1	870,778
600	Whiting, Indiana, Environmental Facilities Revenue Bonds, BP Products North America Inc. Project, Series 2015, 5.000%, 11/01/45 (Alternative Minimum Tax) (Mandatory Put 11/01/22)	No Opt. Call	A1	682,134
2,475	Total Indiana			2,643,563
	Iowa – 1.1%
500	Ames, Iowa, Hospital Revenue Bonds, Mary Greeley Medical Center, Series 2011, 5.250%, 6/15/27 (Pre-refunded 6/15/20)	6/20 at 100.00	A2 (5)	542,160
	Iowa Finance Authority, Iowa, Midwestern Disaster Area Revenue Bonds, Iowa Fertilizer Company Project, Series 2013:
220	5.000%, 12/01/19	No Opt. Call	B	228,065
215	5.500%, 12/01/22	12/18 at 100.00	B	219,302
200	5.250%, 12/01/25	12/23 at 100.00	B	213,254
185	Iowa Finance Authority, Iowa, Midwestern Disaster Area Revenue Bonds, Iowa Fertilizer Company Project, Series 2016, 5.875%, 12/01/27, 144A	6/19 at 105.00	B-	198,159
1,320	Total Iowa			1,400,940
	Kansas – 0.1%
105	Wyandotte County/Kansas City Unified Government, Kansas, Utility System Revenue Bonds, Refunding & Improvement Series 2014A, 5.000%, 9/01/22	No Opt. Call	A+	119,350
	Kentucky – 1.0%
550	Kentucky Economic Development Finance Authority, Hospital Revenue Bonds, Owensboro Health, Refunding Series 2017A, 5.000%, 6/01/31	6/27 at 100.00	Baa3	623,194
350	Kentucky Economic Development Finance Authority, Louisville Arena Project Revenue Bonds, Louisville Arena Authority, Inc., Series 2008-A1, 5.750%, 12/01/28 (Pre-refunded 6/01/18)  –  AGC Insured	6/18 at 100.00	AA (5)	356,272

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Kentucky (continued)
$ 340	Lexington-Fayette Urban County Government Public Facilities Corporation, Kentucky State Lease Revenue Bonds, Eastern State Hospital Project, Series 2011A, 5.250%, 6/01/29	6/21 at 100.00	A1	$ 375,567
1,240	Total Kentucky			1,355,033
	Louisiana – 3.3%
240	De Soto Parrish, Louisiana, Pollution Control Revenue Bonds, Southwestern Electric Power Company Project, Refunding Series 2010, 1.600%, 1/01/19	No Opt. Call	A-	241,111
455	Jefferson Parish Hospital Service District 2, Louisiana, Hospital Revenue Bonds, East Jefferson General Hospital, Refunding Series 2011, 6.375%, 7/01/41	7/21 at 100.00	B3	472,913
	Louisiana Citizens Property Insurance Corporation, Assessment Revenue Bonds, Series 2006-C1:
175	5.875%, 6/01/23 (Pre-refunded 6/01/18)	6/18 at 100.00	AA (5)	178,225
10	6.000%, 6/01/24 (Pre-refunded 6/01/18)	6/18 at 100.00	AA (5)	10,189
1,200	Louisiana Local Government Environmental Facilities and Community Development Authority, Revenue Bonds, Westlake Chemical Corporation Projects, Refunding Series 2017, 3.500%, 11/01/32	11/27 at 100.00	BBB	1,211,496
150	Louisiana Public Facilities Authority, Revenue Bonds, Ochsner Clinic Foundation Project, Refunding Series 2016, 5.000%, 5/15/29	5/26 at 100.00	A3	175,923
100	Louisiana Public Facilities Authority, Revenue Bonds, Ochsner Clinic Foundation Project, Refunding Series 2017, 5.000%, 5/15/30	5/27 at 100.00	A3	117,652
	Louisiana Public Facilities Authority, Revenue Bonds, Ochsner Clinic Foundation Project, Series 2015:
525	5.000%, 5/15/22	No Opt. Call	A3	589,612
335	5.000%, 5/15/24	No Opt. Call	A3	391,672
110	New Orleans, Louisiana, General Obligation Bonds, Refunding Series 2015, 5.000%, 12/01/25	No Opt. Call	AA-	131,897
100	New Orleans, Louisiana, Sewerage Service Revenue Bonds, Series 2015, 5.000%, 6/01/32	6/25 at 100.00	A	115,862
590	Saint Charles Parish, Louisiana, Gulf Opportunity Zone Revenue Bonds, Valero Project, Series 2010, 4.000%, 12/01/40 (Mandatory Put 6/01/22)	No Opt. Call	BBB	631,324
3,990	Total Louisiana			4,267,876
	Maine – 0.0%
35	Portland, Maine, General Airport Revenue Bonds, Refunding Series 2013, 5.000%, 7/01/22	No Opt. Call	BBB+	39,436
	Maryland – 0.3%
335	Baltimore, Maryland, Convention Center Hotel Revenue Bonds, Refunding Series 2017, 5.000%, 9/01/30	9/27 at 100.00	BBB-	397,930
	Massachusetts – 1.0%
200	Massachusetts Development Finance Agency Revenue Bonds, Lawrence General Hospital Issue, Series 2014A, 5.000%, 7/01/27	7/24 at 100.00	BB+	223,820
500	Massachusetts Development Finance Agency, Revenue Bonds, Orchard Cove, Series 2007, 5.000%, 10/01/19	3/18 at 100.00	N/R	500,995

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Massachusetts (continued)
	Massachusetts Port Authority, Special Facilities Revenue Bonds, Delta Air Lines Inc., Series 2001A:
$ 100	5.200%, 1/01/20  –  AMBAC Insured (Alternative Minimum Tax)	3/18 at 100.00	N/R	$101,388
470	5.000%, 1/01/27  –  AMBAC Insured (Alternative Minimum Tax)	1/18 at 100.00	N/R	476,547
1,270	Total Massachusetts			1,302,750
	Michigan – 1.1%
400	Detroit Downtown Development Authority, Michigan, Tax Increment Refunding Bonds, Development Area 1 Projects, Series 1996B, 0.000%, 7/01/23	No Opt. Call	BB	308,728
150	Detroit, Michigan, Senior Lien Sewerage Disposal System Revenue Bonds, Series 2001B, 5.500%, 7/01/29  –  FGIC Insured	No Opt. Call	A3	182,478
150	Michigan Finance Authority, Local Government Loan Program Revenue Bonds, Detroit Water & Sewerage Department Sewage Disposal System Local Project, Second Lien Series 2015C, 5.000%, 7/01/34	7/25 at 100.00	A-	169,464
705	Wayne County Airport Authority, Michigan, Revenue Bonds, Detroit Metropolitan Wayne County Airport, Refunding Series 2015F, 5.000%, 12/01/33 (Alternative Minimum Tax)	12/25 at 100.00	A	816,531
1,405	Total Michigan			1,477,201
	Missouri – 1.2%
100	Branson Industrial Development Authority, Missouri, Tax Increment Revenue Bonds, Branson Shoppes Redevelopment Project, Refunding Series 2017A, 4.000%, 11/01/26	11/25 at 100.00	N/R	101,204
100	Missouri Health and Educational Facilities Authority, Educational Facilities Revenue Bonds, Saint Louis College of Pharmacy, Series 2013, 5.250%, 5/01/33	5/23 at 100.00	BBB+	111,289
30	Missouri Health and Educational Facilities Authority, Educational Facilities Revenue Bonds, Saint Louis College of Pharmacy, Series 2015B, 4.000%, 5/01/32	11/23 at 100.00	BBB+	30,688
1,070	Saint Louis, Missouri, Airport Revenue Bonds, Lambert-St. Louis International Airport, Series 2005, 5.500%, 7/01/19  –  NPFG Insured	No Opt. Call	A-	1,130,241
170	St. Louis County, Missouri, GNMA Collateralized Mortgage Revenue Bonds, Series 1989A, 8.125%, 8/01/20 (Pre-refunded 7/01/20) (Alternative Minimum Tax)	7/20 at 100.00	AA+ (5)	184,261
1,470	Total Missouri			1,557,683
	Montana – 0.3%
260	Billings, Montana, Tax Increment Urban Renewal Revenue Bonds, Expanded North 27th Street, Series 2013A, 5.000%, 7/01/33	1/23 at 100.00	N/R	273,107
120	University of Montana, Revenue Bonds, Series 1996D, 5.375%, 5/15/19  –  NPFG Insured (ETM)	No Opt. Call	N/R (5)	123,275
380	Total Montana			396,382
	Nebraska – 0.1%
100	Douglas County School District 10 Elkhorn, Nebraska, General Obligation Bonds, Public Schools Series 2012, 4.000%, 6/15/23	6/22 at 100.00	AA-	108,964
	Nevada – 2.3%
1,470	Clark County, Nevada, Airport Revenue Bonds, Subordinate Lien Series 2010B, 5.750%, 7/01/42	1/20 at 100.00	Aa3	1,589,878
250	Las Vegas Redevelopment Agency, Nevada, Tax Increment Revenue Bonds, Series 2009A, 8.000%, 6/15/30 (Pre-refunded 6/15/19)	6/19 at 100.00	BBB+ (5)	272,650
50	Las Vegas, Nevada, Local Improvement Bonds, Special Improvement District 607 Providence, Refunding Series 2013, 5.000%, 6/01/22	No Opt. Call	N/R	53,995

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Nevada (continued)
$ 175	Washoe County, Nevada, Gas and Water Facilities Revenue Bonds, Sierra Pacific Power Company, Refunding Series 2016B, 3.000%, 3/01/36 (Mandatory Put 6/01/22)	No Opt. Call	A+	$180,779
775	Washoe County, Nevada, General Obligation Bonds, Reno-Sparks Convention & Visitors Authority, Refunding Series 2011, 5.000%, 7/01/23	7/21 at 100.00	AA	860,017
2,720	Total Nevada			2,957,319
	New Hampshire – 0.1%
105	Business Finance Authority of the State of New Hampshire, Water Facility Revenue Bonds, Pennichuck Water Works, Inc. Project ,Series 2015A, 4.250%, 1/01/36 (Alternative Minimum Tax)	1/26 at 100.00	A+	109,779
	New Jersey – 7.9%
500	Camden County Improvement Authority, New Jersey, Health Care Redevelopment Revenue Bonds, Cooper Health System Obligated Group Issue, Refunding Series 2014A, 5.000%, 2/15/30	2/24 at 100.00	BBB+	558,745
300	Gloucester County Pollution Control Financing Authority, New Jersey, Pollution Control Revenue Bonds, Logan Project, Refunding Series 2014A, 5.000%, 12/01/24 (Alternative Minimum Tax)	No Opt. Call	Ba1	327,597
	New Jersey Economic Development Authority, Cigarette Tax Revenue Refunding Bonds, Series 2012:
150	4.000%, 6/15/19	No Opt. Call	BBB+	154,374
280	5.000%, 6/15/20	No Opt. Call	BBB+	299,636
150	5.000%, 6/15/21	No Opt. Call	BBB+	164,141
345	5.000%, 6/15/22	No Opt. Call	BBB+	385,113
375	5.000%, 6/15/23	6/22 at 100.00	BBB+	416,752
210	5.000%, 6/15/24	6/22 at 100.00	BBB+	231,976
510	5.000%, 6/15/25	6/22 at 100.00	BBB+	560,439
150	5.000%, 6/15/26	6/22 at 100.00	BBB+	163,781
100	4.250%, 6/15/27	6/22 at 100.00	BBB+	104,364
300	5.000%, 6/15/28	6/22 at 100.00	BBB+	323,907
220	New Jersey Economic Development Authority, Private Activity Bonds, The Goethals Bridge Replacement Project, Series 2013, 5.000%, 1/01/28 (Alternative Minimum Tax)	1/24 at 100.00	BBB	248,481
1,000	New Jersey Economic Development Authority, School Facilities Construction Bonds, Refunding Series 2015XX, 5.000%, 6/15/27	6/25 at 100.00	A-	1,123,390
	New Jersey Health Care Facilities Financing Authority, State Contract Bonds, Hospital Asset Transformation Program, Series 2008A:
40	5.250%, 10/01/38 (Pre-refunded 10/01/18)	10/18 at 100.00	N/R (5)	41,136
75	5.250%, 10/01/38 (Pre-refunded 10/01/18)	10/18 at 100.00	BBB+ (5)	76,733
1,095	New Jersey Higher Education Assistance Authority, Student Loan Revenue Bonds, Senior Lien Series 2017-1A, 3.750%, 12/01/31 (Alternative Minimum Tax)	12/26 at 100.00	Aaa	1,111,578
1,280	New Jersey Transportation Trust Fund Authority, Transportation System Bonds, Capital Appreciation Series 2010A, 0.000%, 12/15/33	No Opt. Call	A-	654,477
1,590	New Jersey Transportation Trust Fund Authority, Transportation System Bonds, Series 2010D, 5.000%, 12/15/23	No Opt. Call	A-	1,784,171
330	New Jersey Turnpike Authority, Revenue Bonds, Series 2012B, 5.000%, 1/01/19	No Opt. Call	A+	341,425

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	New Jersey (continued)
$ 270	Salem County Pollution Control Financing Authority, New Jersey, Pollution Control Revenue Bonds, Chambers Project, Refunding Series 2014A, 5.000%, 12/01/23 (Alternative Minimum Tax)	No Opt. Call	BBB-	$293,854
250	South Jersey Port Corporation, New Jersey, Marine Terminal Revenue Bonds, Refunding Series 2012Q, 3.000%, 1/01/22	No Opt. Call	Baa1	250,935
	Tobacco Settlement Financing Corporation, New Jersey, Tobacco Settlement Asset-Backed Bonds, Series 2007-1A:
190	4.500%, 6/01/23	3/18 at 100.00	Baa2	192,609
230	4.625%, 6/01/26	3/18 at 100.00	Ba3	230,738
200	4.750%, 6/01/34	3/18 at 100.00	B3	196,194
70	5.000%, 6/01/41	3/18 at 100.00	B	68,207
10,210	Total New Jersey			10,304,753
	New Mexico – 0.9%
715	Farmington, New Mexico, Pollution Control Revenue Bonds, Southern California Edison Company - Four Corners Project, Refunding Series 2005A, 1.875%, 4/01/29 (Mandatory Put 4/01/20)	No Opt. Call	Aa3	712,726
490	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	A1	513,574
1,205	Total New Mexico			1,226,300
	New York – 4.0%
220	Brooklyn Arena Local Development Corporation, New York, Payment in Lieu of Taxes Revenue Bonds, Barclays Center Project, Series 2009, 6.000%, 7/15/30 (Pre-refunded 1/15/20)	1/20 at 100.00	AA+ (5)	239,056
	Buffalo and Erie County Industrial Land Development Corporation, New York, Revenue Bonds, Catholic Health System, Inc. Project, Series 2015:
210	5.000%, 7/01/23	No Opt. Call	BBB+	241,683
195	5.000%, 7/01/24	No Opt. Call	BBB+	228,390
200	Dormitory Authority of the State of New York, Revenue Bonds, Orange Regional Medical Center Obligated Group, Series 2017, 5.000%, 12/01/28, 144A	6/27 at 100.00	BBB-	230,278
775	Dormitory Authority of the State of New York, State University Educational Facilities Revenue Bonds, Third General Resolution, Series 2012A, 5.000%, 5/15/25	5/22 at 100.00	AA	875,549
	Hudson Yards Infrastructure Corporation, New York, Revenue Bonds, Senior Fiscal 2012 Series 2011A:
270	5.750%, 2/15/47 (Pre-refunded 2/15/21)	2/21 at 100.00	Aa3 (5)	302,964
165	5.750%, 2/15/47	2/21 at 100.00	AA-	181,865
	Long Island Power Authority, New York, Electric System General Revenue Bonds, Series 2000A:
240	0.000%, 6/01/22  –  AGM Insured	No Opt. Call	AA	218,491
170	0.000%, 6/01/24  –  AGM Insured	No Opt. Call	AA	146,817
835	New York State Energy Research and Development Authority, Pollution Control Revenue Bonds, New York State Electric and Gas Corporation, Series 2005A, 2.375%, 7/01/26 (Alternative Minimum Tax) (Mandatory Put 5/01/20)	No Opt. Call	A-	847,416
335	New York State Thruway Authority, General Revenue Junior Indebtedness Obligations, Series 2013A, 5.000%, 5/01/19	No Opt. Call	A-	349,445

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	New York (continued)
	New York Transportation Development Corporation, New York, Special Facility Revenue Refunding Bonds, Terminal One Group Association, L.P. Project, Series 2015:
$ 60	5.000%, 1/01/22 (Alternative Minimum Tax)	No Opt. Call	Baa1	$66,415
60	5.000%, 1/01/23 (Alternative Minimum Tax)	No Opt. Call	A-	67,331
	New York Transportation Development Corporation, Special Facilities Bonds, LaGuardia Airport Terminal B Redevelopment Project, Series 2016A:
135	4.000%, 7/01/32 (Alternative Minimum Tax)	7/24 at 100.00	BBB	141,530
175	4.000%, 7/01/33 (Alternative Minimum Tax)	7/24 at 100.00	BBB	182,733
185	5.000%, 7/01/34 (Alternative Minimum Tax)	7/24 at 100.00	BBB	205,533
275	5.000%, 7/01/46 (Alternative Minimum Tax)	7/24 at 100.00	BBB	302,462
400	Triborough Bridge and Tunnel Authority, New York, General Purpose Revenue Bonds, Refunding Series 2013B, 5.000%, 11/15/21	No Opt. Call	AA-	449,348
4,905	Total New York			5,277,306
	North Carolina – 1.3%
1,315	North Carolina Municipal Power Agency 1, Catawba Electric Revenue Bonds, Series 2015C, 5.000%, 1/01/29	1/26 at 100.00	A	1,567,638
250	North Carolina Turnpike Authority, Monroe Expressway Toll Revenue Bonds, Capital Appreciation Series 2017C, 0.000%, 7/01/27	7/26 at 96.08	BBB-	179,032
1,565	Total North Carolina			1,746,670
	North Dakota – 0.8%
	Burleigh County, North Dakota, Health Care Revenue Bonds, Saint Alexius Medical Center Project, Series 2014A:
200	5.000%, 7/01/29 (Pre-refunded 7/01/21)	7/21 at 100.00	N/R (5)	221,080
650	5.000%, 7/01/31 (Pre-refunded 7/01/21)	7/21 at 100.00	N/R (5)	718,510
115	Ward County Health Care, North Dakota, Revenue Bonds, Trinity Obligated Group, Series 2017C, 5.000%, 6/01/28	No Opt. Call	BBB-	132,433
965	Total North Dakota			1,072,023
	Ohio – 5.3%
	Buckeye Tobacco Settlement Financing Authority, Ohio, Tobacco Settlement Asset-Backed Revenue Bonds, Senior Lien, Series 2007A-2:
1,815	5.125%, 6/01/24	3/18 at 100.00	B-	1,731,583
100	5.375%, 6/01/24	3/18 at 100.00	B-	95,653
725	5.875%, 6/01/30	3/18 at 100.00	B-	699,596
150	5.750%, 6/01/34	3/18 at 100.00	B-	145,198
480	Fairfield County, Ohio, Hospital Facilities Revenue Bonds, Fairfield Medical Center Project, Series 2013, 5.000%, 6/15/43	6/23 at 100.00	Baa2	507,619
	Lake County, Ohio, Hospital Facilities Revenue Bonds, Lake Hospital System, Inc., Refunding Series 2008C:
225	5.500%, 8/15/24 (Pre-refunded 8/15/18)	8/18 at 100.00	NA (5)	230,598
50	5.500%, 8/15/24	8/18 at 100.00	A3	51,260

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Ohio (continued)
	New Albany Community Authority, Ohio, Community Facilities Revenue Refunding Bonds, Series 2012C:
$ 25	4.000%, 10/01/18	No Opt. Call	Aa3	$25,472
30	4.000%, 10/01/19	No Opt. Call	Aa3	31,238
40	4.000%, 10/01/20	No Opt. Call	Aa3	42,345
45	5.000%, 10/01/21	No Opt. Call	Aa3	50,087
35	5.000%, 10/01/22	No Opt. Call	Aa3	39,831
25	Ohio Air Quality Development Authority, Ohio, Air Quality Development Revenue Bonds, FirstEnergy Generation Corporation Project, Series 2009A, 5.700%, 8/01/20	No Opt. Call	C	11,061
120	Ohio Air Quality Development Authority, Ohio, Pollution Control Revenue Bonds, FirstEnergy Generation Corporation Project, Refunding Series 2009B, 3.100%, 3/01/23 (Mandatory Put 3/01/19)	No Opt. Call	Ca	53,095
260	Ohio Air Quality Development Authority, Ohio, Pollution Control Revenue Bonds, FirstEnergy Generation Corporation Project, Refunding Series 2009C, 5.625%, 6/01/18	No Opt. Call	CCC+	259,397
485	Ohio Air Quality Development Authority, Ohio, Pollution Control Revenue Bonds, FirstEnergy Generation Project, Refunding Series 2006A, 3.750%, 12/01/23 (Mandatory Put 12/03/18)	No Opt. Call	Ca	214,593
90	Ohio Air Quality Development Authority, Ohio, Pollution Control Revenue Bonds, FirstEnergy Nuclear Generation Corporation Project, Refunding Series 2010A, 3.125%, 7/01/33 (Mandatory Put 7/02/18)	No Opt. Call	Ca	39,823
130	Ohio Air Quality Development Authority, Ohio, Pollution Control Revenue Bonds, FirstEnergy Nuclear Generation Project, Refunding Series 2006B, 3.625%, 12/01/33 (Mandatory Put 6/01/20)	No Opt. Call	Ca	57,515
45	Ohio Air Quality Development Authority, Ohio, Revenue Bonds, Pratt Paper Ohio, LLC Project, Series 2017, 3.750%, 1/15/28 (Alternative Minimum Tax), 144A	No Opt. Call	N/R	46,835
2,000	Ohio Turnpike Commission, Turnpike Revenue Bonds, Infrastructure Projects, Junior Lien Convertible Series 2013A-3, 0.000%, 2/15/34 (4)	2/31 at 100.00	A+	1,995,720
230	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)	No Opt. Call	Ca	101,747
120	Ohio Water Development Authority, Pollution Control Revenue Refunding Bonds, FirstEnergy Nuclear Generating Corporation Project, Series 2006A, 3.000%, 5/15/19	No Opt. Call	Caa1	53,095
110	Ohio Water Development Authority, Pollution Control Revenue Refunding Bonds, FirstEnergy Nuclear Generating Corporation Project, Series 2006B, 4.000%, 12/01/33 (Mandatory Put 6/03/19)	No Opt. Call	Ca	48,671
110	Ohio Water Development Authority, Pollution Control Revenue Refunding Bonds, FirstEnergy Nuclear Generating Corporation Project, Series 2008B, 3.625%, 10/01/33 (Mandatory Put 4/01/20)	No Opt. Call	Ca	48,667
220	Ohio Water Development Authority, Pollution Control Revenue Refunding Bonds, FirstEnergy Nuclear Generating Corporation Project, Series 2010A, 3.750%, 7/01/33 (Mandatory Put 7/01/20)	No Opt. Call	Ca	97,332
235	Ohio Water Development Authority, Pollution Control Revenue Refunding Bonds, FirstEnergy Nuclear Generating Corporation Project, Series 2010C, 4.000%, 6/01/33 (Mandatory Put 6/03/19)	No Opt. Call	Ca	103,978
100	Tuscarawas County Economic Development and Finance Alliance, Ohio, Higher Education Facilities Revenue Bonds, Ashland University, Refunding & Improvement Series 2015, 5.375%, 3/01/27	3/25 at 100.00	N/R	103,295
8,000	Total Ohio			6,885,304

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Oklahoma – 0.2%
$ 250	Comanche County Educational Facilities Authority, Oklahoma, Educational Facilities Lease Revenue Bonds, Elgin Public Schools Project, Series 2017A, 5.000%, 12/01/31	12/27 at 100.00	A	$ 298,983
	Oregon – 0.6%
1,250	Beaverton School District 48J, Washington and Multnomah Counties, Oregon, General Obligation Bonds, Deferred Interest Series 2017B, 0.000%, 6/15/31	6/27 at 85.82	AA+	807,375
	Pennsylvania – 6.1%
220	Beaver County Industrial Development Authority, Pennsylvania, Pollution Control Revenue Refunding Bonds, FirstEnergy Nuclear Generation Project, Series 2008A, 2.700%, 4/01/35 (Mandatory Put 4/02/18)	No Opt. Call	Ca	97,350
200	Lehigh County Industrial Development Authority, Pennsylvania, Pollution Control Revenue Bonds, Pennsylvania Power and Light Company, Series 2016A, 1.800%, 9/01/29 (Mandatory Put 9/01/22)	No Opt. Call	A1	196,822
455	Lehigh County Industrial Development Authority, Pennsylvania, Pollution Control Revenue Bonds, Pennsylvania Power and Light Company, Series 2016B, 1.800%, 2/15/27 (Mandatory Put 8/15/22)	No Opt. Call	A1	448,034
200	Luzerne County Industrial Development Authority, Pennsylvania, Guaranteed Lease Revenue Bonds, Series 2009, 7.750%, 12/15/27 (Pre-refunded 12/15/19)	12/19 at 100.00	N/R (5)	223,272
500	Montgomery County Industrial Development Authority, Pennsylvania, Pollution Control Revenue Bonds, PECO Energy Company Project, Refunding Series 1996A, 2.600%, 3/01/34 (Mandatory Put 9/01/20)	No Opt. Call	BBB	502,425
500	Montgomery County Industrial Development Authority, Pennsylvania, Pollution Control Revenue Bonds, PECO Energy Company Project, Refunding Series 1999A, 2.500%, 10/01/30 (Mandatory Put 4/01/20)	No Opt. Call	BBB	502,055
5	Pennsylvania Economic Development Financing Authority, Exempt Facilities Revenue Bonds, Shippingport Project, First Energy Guarantor., Series 2006A, 2.550%, 11/01/41 (Mandatory Put 12/03/18)	No Opt. Call	Ca	2,212
405	Pennsylvania Economic Development Financing Authority, Health System Revenue Bonds, Albert Einstein Healthcare, Series 2009A, 6.250%, 10/15/23 (Pre-refunded 10/15/19)	10/19 at 100.00	N/R (5)	433,285
500	Pennsylvania Economic Development Financing Authority, Parking System Revenue Bonds, Capitol Region Parking System, Junior Guaranteed Series 2013B, 5.500%, 1/01/27	1/24 at 100.00	AA	585,450
250	Pennsylvania Economic Development Financing Authority, Parking System Revenue Bonds, Capitol Region Parking System, Junior Insured Series 2013C, 5.500%, 1/01/26  –  AGM Insured	1/24 at 100.00	AA	293,793
230	Pennsylvania Economic Development Financing Authority, Private Activity Revenue Bonds, Pennsylvania Rapid Bridge Replacement Project, Series 2015, 5.000%, 12/31/25 (Alternative Minimum Tax)	No Opt. Call	BBB	270,521
140	Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, University of the Arts, Series 1999, 5.150%, 3/15/20  –  AGC Insured (ETM)	3/18 at 100.00	AA (5)	145,313
250	Pennsylvania Housing Finance Agency, Single Family Mortgage Revenue Bonds, Series 2017-125A, 3.400%, 10/01/32 (Alternative Minimum Tax)	4/27 at 100.00	AA+	249,415
	Pennsylvania Turnpike Commission, Motor License Fund-Enhanced Turnpike Special Revenue Bonds, Subordinate Series 2010A1&2:
115	5.500%, 12/01/34 (Pre-refunded 12/01/20)	12/20 at 100.00	N/R (5)	127,116
475	5.500%, 12/01/34 (Pre-refunded 12/01/20)	12/20 at 100.00	AA- (5)	526,476

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Pennsylvania (continued)
	Pennsylvania Turnpike Commission, Turnpike Revenue Bonds, Refunding Subordinate Second Series 2016B-2:
$ 560	5.000%, 6/01/29	6/26 at 100.00	A3	$655,402
580	5.000%, 6/01/35	6/26 at 100.00	A3	665,654
540	Philadelphia Gas Works, Pennsylvania, Revenue Bonds, Twelfth Series 1990B, 7.000%, 5/15/20  –  NPFG Insured (ETM)	No Opt. Call	N/R (5)	576,979
65	Quakertown, Pennsylvania, General Authority Health Facilities Revenue USDA Loan Anticipation Notes and Revenue Bonds for LifeQuest Obligated Group, Series 2017A, 3.125%, 7/01/21	7/19 at 100.00	N/R	65,071
875	Saint Mary Hospital Authority, Pennsylvania, Health System Revenue Bonds, Catholic Health East, Series 2009D, 6.250%, 11/15/34	5/19 at 100.00	AA-	928,988
60	Scranton-Lackawanna Health and Welfare Authority, Pennsylvania, University Revenue Bonds, Marywood University, Series 2016, 3.375%, 6/01/26	No Opt. Call	BB+	58,685
330	Union County Hospital Authority, Pennsylvania, Hospital Revenue Bonds, Evangelical Community Hospital Project, Refunding & Improvement Series 2011, 5.750%, 8/01/21	No Opt. Call	A-	368,399
7,455	Total Pennsylvania			7,922,717
	Rhode Island – 0.2%
200	Rhode Island Health and Educational Building Corporation, Revenue Bonds, Care New England Health System, Series 2013A, 5.500%, 9/01/28 (Pre-refunded 9/01/23)	9/23 at 100.00	BB- (5)	237,874
	South Carolina – 3.7%
	Piedmont Municipal Power Agency, South Carolina, Electric Revenue Bonds, Refunding Series 1991:
1,540	6.750%, 1/01/19  –  FGIC Insured (ETM)	No Opt. Call	A3 (5)	1,621,081
3,040	6.750%, 1/01/19  –  FGIC Insured	No Opt. Call	A3	3,196,317
4,580	Total South Carolina			4,817,398
	Tennessee – 1.2%
	Knox County Health, Educational and Housing Facility Board, Tennessee, Hospital Revenue Bonds, Covenant Health, Refunding Series 2012A:
105	4.000%, 1/01/22	No Opt. Call	A	112,981
180	5.000%, 1/01/23	No Opt. Call	A	204,720
100	Metropolitan Government of Nashville-Davidson County Health and Educational Facilities Board, Tennessee, Revenue Bonds, Knowledge Academy Charter School, Series 2017A, 4.625%, 6/15/27, 144A	No Opt. Call	N/R	99,998
1,085	The Tennessee Energy Acquisition Corporation, Gas Revenue Bonds, Series 2017A, 4.000%, 5/01/48 (Mandatory Put 5/01/23)	5/23 at 100.43	A	1,189,518
1,470	Total Tennessee			1,607,217
	Texas – 6.2%
10	Bexar Metropolitan Water District, Texas, Waterworks System Revenue Bonds, Refunding Series 2010, 5.875%, 5/01/40 (Pre-refunded 5/01/20)	5/20 at 100.00	AA (5)	10,956
	Bexar Metropolitan Water District, Texas, Waterworks System Revenue Refunding Bonds, Series 2009:
65	5.000%, 5/01/29 (Pre-refunded 5/01/19)	5/19 at 100.00	AA (5)	67,952
165	5.000%, 5/01/39 (Pre-refunded 5/01/19)	5/19 at 100.00	AA (5)	172,494
25	Brazos River Authority, Texas, Collateralized Pollution Control Revenue Bonds, Texas Utilities Electric Company, Series 2003D, 5.400%, 10/01/29 (6)	No Opt. Call	C	—

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Texas (continued)
$ 525	Central Texas Regional Mobility Authority, Revenue Bonds, Senior Lien Series 2011, 6.250%, 1/01/46 (Pre-refunded 1/01/21)	1/21 at 100.00	BBB+ (5)	$594,615
1,000	Central Texas Regional Mobility Authority, Revenue Bonds, Senior Lien, Series 2015A, 5.000%, 1/01/31	7/25 at 100.00	BBB+	1,151,450
155	Harris County-Houston Sports Authority, Texas, Revenue Bonds, Refunding Second Lien Series 2014C, 5.000%, 11/15/24	No Opt. Call	BBB	180,902
395	Harris County-Houston Sports Authority, Texas, Revenue Bonds, Refunding Senior Lien Series 2014A, 5.000%, 11/15/26  –  AGM Insured	11/24 at 100.00	AA	467,609
50	Houston, Texas, Airport System Special Facilities Revenue Bonds, United Airlines, Inc. Terminal E Project, Refunding Series 2014, 5.000%, 7/01/29 (Alternative Minimum Tax)	7/24 at 100.00	BB-	55,457
500	Houston, Texas, Hotel Occupancy Tax and Special Revenue Bonds, Convention and Entertainment Project, Series 2001B, 0.000%, 9/01/23  –  AMBAC Insured	No Opt. Call	A2	437,810
430	Love Field Airport Modernization Corporation, Texas, General Airport Revenue Bonds Series 2015, 5.000%, 11/01/28 (Alternative Minimum Tax)	11/25 at 100.00	A1	505,315
300	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	324,687
	McCamey County Hospital District, Texas, General Obligation Bonds, Series 2013:
100	5.000%, 12/01/25	No Opt. Call	B1	106,025
100	5.250%, 12/01/28	12/25 at 100.00	B1	105,555
250	Mission Economic Development Corporation, Texas, Revenue Bonds, Natgasoline Project, Series 2016B, 5.750%, 10/01/31 (Alternative Minimum Tax), 144A	10/18 at 103.00	BB-	261,640
	North Central Texas Health Facilities Development Corporation, Texas, Revenue Bonds, Children's Medical Center Dallas Project, Series 2012:
425	5.000%, 8/15/24 (Pre-refunded 8/15/22)	8/22 at 100.00	Aa2 (5)	484,781
380	5.000%, 8/15/25 (Pre-refunded 8/15/22)	8/22 at 100.00	Aa2 (5)	433,451
	North Texas Tollway Authority, Special Projects System Revenue Bonds, Convertible Capital Appreciation Series 2011C:
100	0.000%, 9/01/43 (Pre-refunded 9/01/31) (4)	9/31 at 100.00	AA+ (5)	110,861
490	0.000%, 9/01/45 (Pre-refunded 9/01/31) (4)	9/31 at 100.00	AA+ (5)	593,459
760	North Texas Tollway Authority, Special Projects System Revenue Bonds, Current Interest Series 2011D, 5.000%, 9/01/24 (Pre-refunded 9/01/21)	9/21 at 100.00	AA+ (5)	846,062
455	North Texas Tollway Authority, System Revenue Bonds, Refunding First Tier, Series 2014A, 5.000%, 1/01/23	No Opt. Call	A1	520,970
110	Texas Municipal Gas Acquisition and Supply Corporation III, Gas Supply Revenue Bonds, Series 2012, 5.000%, 12/15/32	12/22 at 100.00	A3	122,565
475	Texas Transportation Commission, Central Texas Turnpike System Revenue Bonds, Second Tier Refunding Series 2015C, 5.000%, 8/15/31	8/24 at 100.00	BBB+	544,184
7,265	Total Texas			8,098,800
	Virginia – 0.6%
100	Peninsula Ports Authority of Virginia, Coal Terminal Revenue Bonds, Dominion Terminal Associates Project-DETC Issue, Refunding Series 2003, 1.550%, 10/01/33 (Mandatory Put 10/01/19)	No Opt. Call	BBB+	99,777
575	Virginia Small Business Financing Authority, Senior Lien Revenue Bonds, Elizabeth River Crossing, Opco LLC Project, Series 2012, 5.500%, 1/01/42 (Alternative Minimum Tax)	7/22 at 100.00	BBB	641,165
675	Total Virginia			740,942

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Washington – 2.2%
$ 1,000	Port of Seattle, Washington, Revenue Bonds, Intermediate Lien Series 2015C, 5.000%, 4/01/23 (Alternative Minimum Tax)	No Opt. Call	AA-	$1,135,820
1,050	Washington Health Care Facilities Authority, Revenue Bonds, Fred Hutchinson Cancer Research Center, Series 2011A, 5.375%, 1/01/31	1/21 at 100.00	A	1,135,019
585	Whidbey Island Public Hospital District, Island County, Washington, General Obligation Bonds, Whidbey General Hospital, Series 2013, 5.500%, 12/01/33	12/22 at 100.00	Baa2	632,689
2,635	Total Washington			2,903,528
	West Virginia – 0.6%
100	Monongalia County Commission, West Virginia, Special District Excise Tax Revenue, University Town Centre Economic Opportunity Development District, Refunding & Improvement Series 2017A, 4.500%, 6/01/27, 144A	No Opt. Call	N/R	100,720
120	West Virginia Economic Development Authority, Energy Revenue Bonds, Morgantown Energy Associates Project, Refunding Series 2016, 2.875%, 12/15/26 (Alternative Minimum Tax)	No Opt. Call	Baa3	118,706
250	West Virginia Economic Development Authority, Solid Waste Disposal Facilities Revenue Bonds, Appalachian Power Company - Amos Project, Series 2011A, 1.700%, 1/01/41 (Alternative Minimum Tax) (Mandatory Put 9/01/20)	No Opt. Call	A-	246,083
240	West Virginia Hospital Finance Authority, Revenue Bonds, West Virginia University Health System Obligated Group, Improvement Series 2017A, 3.375%, 6/01/29	6/27 at 100.00	A	250,159
710	Total West Virginia			715,668
	Wisconsin – 4.4%
600	Public Finance Authority of Wisconsin, Limited Obligation PILOT Revenue Bonds, American Dream @ Meadowlands Project, Series 2017, 6.500%, 12/01/37, 144A	12/27 at 100.00	N/R	698,730
185	Public Finance Authority of Wisconsin, Revenue Bonds, Denver international Airport Great Hall Project, Series 2017, 5.000%, 9/30/49 (Alternative Minimum Tax)	9/27 at 100.00	BBB	211,009
350	Public Finance Authority of Wisconsin, Solid Waste Disposal Revenue Bonds, Waste Management Inc., Refunding Series 2016A-2, 2.875%, 5/01/27 (Alternative Minimum Tax)	5/26 at 100.00	A-	354,011
	University of Wisconsin Hospitals and Clinics Authority, Revenue Bonds, Refunding Series 2013A:
755	4.000%, 4/01/20	No Opt. Call	AA-	793,920
25	5.000%, 4/01/22	No Opt. Call	AA-	28,285
325	Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Aurora Health Care, Inc., Series 2010B, 5.000%, 7/15/20	No Opt. Call	A+	347,903
675	Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Aurora Health Care, Inc., Series 2012A, 5.000%, 7/15/25	7/21 at 100.00	A+	744,363
455	Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Marshfield Clinic, Series 2017C, 3.250%, 2/15/33	2/27 at 100.00	A-	452,297
1,500	Wisconsin Health and Educational Facilities Authority, Wisconsin, Revenue Bonds, ThedaCare Inc., Series 2015, 5.000%, 12/15/26	12/24 at 100.00	AA-	1,759,605

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	Wisconsin (continued)
	Wisconsin State, General Fund Annual Appropriation Revenue Bonds, Refunding Series 2009A:
$ 45	5.000%, 5/01/21	5/19 at 100.00	Aa2	$47,056
30	5.375%, 5/01/25 (Pre-refunded 5/01/19)	5/19 at 100.00	N/R (5)	31,510
30	5.375%, 5/01/25	5/19 at 100.00	Aa2	31,518
5	5.625%, 5/01/28 (Pre-refunded 5/01/19)	5/19 at 100.00	N/R (5)	5,268
35	5.625%, 5/01/28	5/19 at 100.00	Aa2	36,852
155	6.000%, 5/01/33 (Pre-refunded 5/01/19)	5/19 at 100.00	Aa2 (5)	164,069
35	6.000%, 5/01/33 (Pre-refunded 5/01/19)	5/19 at 100.00	N/R (5)	37,048
5,205	Total Wisconsin			5,743,444
$ 125,060	Total Municipal Bonds (cost $122,894,438)			129,479,152

Principal Amount (000)	Description (1)	Coupon	Maturity	Ratings (3)	Value
	CORPORATE BONDS – 0.0%
	Transportation – 0.0%
$ 16	Las Vegas Monorail Company, Senior Interest Bonds (7), (8)	5.500%	7/15/19	N/R	$10,299
5	Las Vegas Monorail Company, Senior Interest Bonds (7), (8)	5.500%	7/15/55	N/R	2,179
$ 21	Total Corporate Bonds (cost $1,494)				12,478
	Total Long-Term Investments (cost $122,895,932)				129,491,630

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	SHORT-TERM INVESTMENTS – 0.3%
	MUNICIPAL BONDS – 0.3%
	Florida – 0.3%
$ 385	Miami-Dade County School Board, Florida, Variable Rate Demand Obligation, Certificates of Participation, Tender Option Bond Floater 2013-005, 1.170%, 5/01/37 (9)	1/18 at 100.00	A-2	$ 385,000
$ 385	Total Short-Term Investments (cost $385,000)			385,000
	Total Investments (cost $123,280,932) – 99.3%			129,876,630
	Other Assets Less Liabilities – 0.7%			980,599
	Net Assets – 100%			$ 130,857,229

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	$ —	$129,479,152	$  —	$129,479,152
Corporate Bonds	—	—	12,478	12,478
Short-Term Investments:
Municipal Bonds	—	385,000	—	385,000
Total	$ —	$129,864,152	$12,478	$129,876,630

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 and timing differences in recognizing certain gains and losses on investment transactions. 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 December 31, 2017.

Tax cost of investments	$123,141,290
Gross unrealized:
Appreciation	$ 7,289,118
Depreciation	(553,778)
Net unrealized appreciation (depreciation) of investments	$ 6,735,340

(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.
(9)	Investment has 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.
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.

Item 2. Controls and Procedures.

a. 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)).

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

Date: March 1, 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: March 1, 2018
By (Signature and Title)	/s/ Stephen D. Foy
	Stephen D. Foy
	Vice President and Controller (principal financial officer)
Date: March 1, 2018