N-Q 1 nxc.htm NXC



 
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 811-06623
 
Nuveen California Select Tax-Free Income Portfolio
(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:            3/31          
 
Date of reporting period:         12/31/16         
 
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
 
           
 
 
Portfolio of Investments 
 
 
 
           
 
 
Nuveen California Select Tax-Free Income Portfolio (NXC) 
 
 
 
 
 
December 31, 2016 (Unaudited) 
 
 
 
 
 
Principal 
 
 
Optional Call 
 
 
Amount (000) 
 
Description (1) 
Provisions (2) 
Ratings (3) 
Value 
 
 
LONG-TERM INVESTMENTS – 98.6% 
 
 
 
           
 
 
MUNICIPAL BONDS – 98.6% 
 
 
 
           
 
 
Consumer Staples – 6.1% 
 
 
 
$ 1,000 
 
California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Gold 
3/17 at 100.00 
CCC 
$ 936,110 
 
 
Country Settlement Funding Corporation, Refunding Series 2006, 5.250%, 6/01/46 
 
 
 
65 
 
California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma 
3/17 at 100.00 
BBB+ 
64,997 
 
 
County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21 
 
 
 
1,450 
 
Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed 
6/17 at 100.00 
B– 
1,315,295 
 
 
Bonds, Series 2007A-1, 5.000%, 6/01/33 
 
 
 
1,095 
 
Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed 
6/22 at 100.00 
B– 
1,015,470 
 
 
Bonds, Series 2007A-2, 5.300%, 6/01/37 
 
 
 
1,500 
 
Tobacco Securitization Authority of Northern California, Tobacco Settlement Asset-Backed 
3/17 at 100.00 
B– 
1,408,110 
 
 
Bonds, Series 2005A-1, 5.500%, 6/01/45 
 
 
 
1,000 
 
Tobacco Securitization Authority of Southern California, Tobacco Settlement Asset-Backed 
3/17 at 100.00 
BB+ 
955,960 
 
 
Bonds, San Diego County Tobacco Asset Securitization Corporation, Senior Series 2006A, 
 
 
 
 
 
5.000%, 6/01/37 
 
 
 
6,110 
 
Total Consumer Staples 
 
 
5,695,942 
 
 
Education and Civic Organizations – 3.6% 
 
 
 
195 
 
California Educational Facilities Authority, Revenue Bonds, Santa Clara University, Series 
4/18 at 100.00 
Aa3 
204,561 
 
 
2008A, 5.625%, 4/01/37 
 
 
 
160 
 
California Municipal Finance Authority, Charter School Revenue Bonds, Rocketship 
6/22 at 102.00 
N/R 
180,568 
 
 
Education Multiple Projects, Series 2014A , 7.250%, 6/01/43 
 
 
 
60 
 
California School Finance Authority, School Facility Revenue Bonds, Alliance for College-Ready 
7/25 at 100.00 
BBB 
60,074 
 
 
Public Schools Project, Series 2016A, 5.000%, 7/01/46 
 
 
 
385 
 
California School Finance Authority, School Facility Revenue Bonds, Alliance for College-Ready 
7/25 at 101.00 
BBB 
385,520 
 
 
Public Schools Project, Series 2016C, 5.000%, 7/01/46 
 
 
 
2,000 
 
California State University, Systemwide Revenue Bonds, Refunding Series 2015A, 5.000%, 11/01/38 
11/25 at 100.00 
Aa2 
2,288,340 
250 
 
California Statewide Communities Development Authority, School Facility Revenue Bonds, 
7/21 at 100.00 
BBB– 
281,878 
 
 
Alliance College-Ready Public Schools, Series 2011A, 7.000%, 7/01/46 
 
 
 
3,050 
 
Total Education and Civic Organizations 
 
 
3,400,941 
 
 
Health Care – 12.6% 
 
 
 
1,000 
 
California Health Facilities Financing Authority, California, Revenue Bonds, Sutter Health, 
11/26 at 100.00 
AA– 
1,112,040 
 
 
Refunding Series 2016B, 5.000%, 11/15/46 
 
 
 
2,500 
 
California Health Facilities Financing Authority, California, Revenue Bonds, Sutter Health, 
11/25 at 100.00 
AA– 
2,769,775 
 
 
Series 2016A, 5.000%, 11/15/41 
 
 
 
115 
 
California Health Facilities Financing Authority, Revenue Bonds, Lucile Salter Packard 
8/24 at 100.00 
AA 
126,130 
 
 
Children’s Hospital, Series 2014A, 5.000%, 8/15/43 
 
 
 
125 
 
California Health Facilities Financing Authority, Revenue Bonds, Providence Health & Services, 
10/24 at 100.00 
AA– 
140,700 
 
 
Refunding Series 2014A, 5.000%, 10/01/38 
 
 
 
255 
 
California Health Facilities Financing Authority, Revenue Bonds, Providence Health & Services, 
10/24 at 100.00 
AA– 
278,769 
 
 
Series 2014B, 5.000%, 10/01/44 
 
 
 
2,000 
 
California Health Facilities Financing Authority, Revenue Bonds, Providence Saint Joseph 
10/26 at 100.00 
AA– 
1,975,460 
 
 
Health, Refunding Series 2016A, 4.000%, 10/01/47 
 
 
 
235 
 
California Health Facilities Financing Authority, Revenue Bonds, Rady Children’s Hospital – 
8/21 at 100.00 
Aa3 
255,866 
 
 
San Diego, Series 2011, 5.250%, 8/15/41 
 
 
 
130 
 
California Municipal Finance Authority, Revenue Bonds, NorthBay Healthcare Group, Series 
11/26 at 100.00 
BBB– 
137,336 
 
 
2017A, 5.250%, 11/01/41 (WI/DD, Settling 1/11/17) 
 
 
 
350 
 
California Statewide Communities Development Authority, California, Revenue Bonds, Loma Linda 
12/24 at 100.00 
BB+ 
366,009 
 
 
University Medical Center, Series 2014A, 5.250%, 12/01/34 
 
 
 
 
 
California Statewide Communities Development Authority, California, Revenue Bonds, Loma Linda 
 
 
 
 
 
University Medical Center, Series 2016A: 
 
 
 
825 
 
5.000%, 12/01/46 
6/26 at 100.00 
BB 
837,350 
540 
 
5.250%, 12/01/56 
6/26 at 100.00 
BB 
554,920 
425 
 
California Statewide Community Development Authority, Revenue Bonds, Childrens Hospital of Los 
8/17 at 100.00 
BBB+ 
429,947 
 
 
Angeles, Series 2007, 5.000%, 8/15/47 
 
 
 
1,100 
 
Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2010, 
11/20 at 100.00 
BBB– 
1,199,627 
 
 
6.000%, 11/01/41 
 
 
 
670 
 
San Buenaventura, California, Revenue Bonds, Community Memorial Health System, Series 2011, 
12/21 at 100.00 
BB+ 
783,197 
 
 
7.500%, 12/01/41 
 
 
 
800 
 
Upland, California, Certificates of Participation, San Antonio Community Hospital, Series 
1/21 at 100.00 
BBB+ 
892,712 
 
 
2011, 6.500%, 1/01/41 
 
 
 
11,070 
 
Total Health Care 
 
 
11,859,838 
 
 
Housing/Multifamily – 1.0% 
 
 
 
360 
 
California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects 
8/20 at 100.00 
BBB 
396,331 
 
 
Series 2010A, 6.400%, 8/15/45 
 
 
 
395 
 
California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects 
8/22 at 100.00 
BBB 
433,181 
 
 
Series 2012A, 5.500%, 8/15/47 
 
 
 
 
 
California Municipal Finance Authority, Mobile Home Park Senior Revenue Bonds, Caritas 
 
 
 
 
 
Affordable Housing, Inc. Projects, Series 2014A: 
 
 
 
25 
 
5.250%, 8/15/39 
8/24 at 100.00 
BBB 
27,869 
65 
 
5.250%, 8/15/49 
8/24 at 100.00 
BBB 
71,956 
845 
 
Total Housing/Multifamily 
 
 
929,337 
 
 
Industrials – 1.1% 
 
 
 
1,015 
 
California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic 
No Opt. Call 
BBB+ 
1,044,841 
 
 
Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative 
 
 
 
 
 
Minimum Tax) 
 
 
 
 
 
Tax Obligation/General – 26.8% 
 
 
 
1,000 
 
California State, General Obligation Bonds, Various Purpose Refunding Series 2015, 
8/25 at 100.00 
AA– 
1,149,560 
 
 
5.000%, 8/01/34 
 
 
 
1,650 
 
California State, General Obligation Bonds, Various Purpose Series 2009, 5.500%, 11/01/39 
11/19 at 100.00 
AA– 
1,806,486 
1,965 
 
California State, General Obligation Bonds, Various Purpose Series 2011, 5.000%, 10/01/41 
10/21 at 100.00 
AA– 
2,182,840 
2,000 
 
California State, General Obligation Bonds, Various Purpose Series 2012, 5.250%, 4/01/35 
4/22 at 100.00 
AA– 
2,258,680 
 
 
Golden West Schools Financing Authority, California, General Obligation Revenue Refunding 
 
 
 
 
 
Bonds, School District Program, Series 1999A: 
 
 
 
1,750 
 
0.000%, 2/01/17 – NPFG Insured 
No Opt. Call 
AA– 
1,748,460 
2,375 
 
0.000%, 8/01/17 – NPFG Insured 
No Opt. Call 
AA– 
2,358,898 
2,345 
 
0.000%, 2/01/18 – NPFG Insured 
No Opt. Call 
AA– 
2,310,294 
 
 
Mountain View-Los Altos Union High School District, Santa Clara County, California, General 
 
 
 
 
 
Obligation Bonds, Capital Appreciation Series 1997C: 
 
 
 
1,015 
 
0.000%, 5/01/17 – NPFG Insured 
No Opt. Call 
Aaa 
1,011,539 
1,080 
 
0.000%, 5/01/18 – NPFG Insured 
No Opt. Call 
Aaa 
1,060,020 
7,575 
 
Palomar Pomerado Health, California, General Obligation Bonds, Convertible Capital 
No Opt. Call 
A+ 
3,561,383 
 
 
Appreciation, Election 2004 Series 2010A, 0.000%, 8/01/34 
 
 
 
8,075 
 
San Bernardino Community College District, California, General Obligation Bonds, Election of 
No Opt. Call 
Aa2 
2,302,909 
 
 
2008 Series 2009B, 0.000%, 8/01/44 
 
 
 
4,250 
 
West Hills Community College District, California, General Obligation Bonds, School Facilities 
8/31 at 100.00 
AA 
3,349,553 
 
 
Improvement District 3, 2008 Election Series 2011, 0.000%, 8/01/38 – AGM Insured (4) 
 
 
 
35,080 
 
Total Tax Obligation/General 
 
 
25,100,622 
 
 
Tax Obligation/Limited – 18.0% 
 
 
 
1,000 
 
Bell Community Redevelopment Agency, California, Tax Allocation Bonds, Bell Project Area, 
3/17 at 100.00 
AA 
1,001,830 
 
 
Series 2003, 5.625%, 10/01/33 – RAAI Insured 
 
 
 
2,000 
 
California State Public Works Board, Lease Revenue Bonds, Department of Corrections & 
9/23 at 100.00 
A+ 
2,357,400 
 
 
Rehabilitation, Various Correctional Facilities Series 2013F, 5.250%, 9/01/33 
 
 
 
360 
 
Chino Redevelopment Agency, California, Merged Chino Redevelopment Project Area Tax Allocation 
9/17 at 100.00 
364,385 
 
 
Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured 
 
 
 
1,000 
 
Fontana Public Financing Authority, California, Tax Allocation Revenue Bonds, North Fontana 
3/17 at 100.00 
1,002,200 
 
 
Redevelopment Project, Series 2005A, 5.000%, 10/01/32 – AMBAC Insured 
 
 
 
270 
 
Fontana Redevelopment Agency, San Bernardino County, California, Tax Allocation Bonds, Jurupa 
4/17 at 100.00 
272,711 
 
 
Hills Redevelopment Project, Refunding Series 1997A, 5.500%, 10/01/27 
 
 
 
3,000 
 
Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement 
6/25 at 100.00 
A+ 
3,311,820 
 
 
Asset-Backed Revenue Bonds, Refunding Series 2015A, 5.000%, 6/01/40 
 
 
 
250 
 
Inglewood Redevelopment Agency, California, Tax Allocation Bonds, Merged Redevelopment 
5/17 at 100.00 
BBB+ 
251,680 
 
 
Project, Subordinate Lien Series 2007A-1, 5.000%, 5/01/23 – AMBAC Insured 
 
 
 
1,215 
 
Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Vermont 
3/17 at 100.00 
Aa3 
1,218,086 
 
 
Manchester Social Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured 
 
 
 
1,000 
 
Los Angeles County Metropolitan Transportation Authority, California, Measure R Sales Tax 
6/26 at 100.00 
AAA 
1,161,250 
 
 
Revenue Bonds, Senior Series 2016A, 5.000%, 6/01/38 
 
 
 
135 
 
National City Community Development Commission, California, Tax Allocation Bonds, National 
8/21 at 100.00 
160,395 
 
 
City Redevelopment Project, Series 2011, 6.500%, 8/01/24 
 
 
 
1,000 
 
Norco Redevelopment Agency, California, Tax Allocation Bonds, Project Area 1, Series 2009, 
3/18 at 100.00 
A+ 
1,061,230 
 
 
7.000%, 3/01/34 
 
 
 
50 
 
Novato Redevelopment Agency, California, Tax Allocation Bonds, Hamilton Field Redevelopment 
9/21 at 100.00 
BBB+ 
58,371 
 
 
Project, Series 2011, 6.750%, 9/01/40 
 
 
 
60 
 
Patterson Public Finance Authority, California Revenue Bonds, Community Facilities District 2001-1, 
9/23 at 100.00 
N/R 
64,537 
 
 
Subordinate Lien Series 2013B , 5.875%, 9/01/39 
 
 
 
 
 
Patterson Public Financing Authority, California, Revenue Bonds, Community Facilities District 
 
 
 
 
 
2001-1, Senior Series 2013A: 
 
 
 
350 
 
5.250%, 9/01/30 
9/23 at 100.00 
N/R 
373,468 
320 
 
5.750%, 9/01/39 
9/23 at 100.00 
N/R 
341,539 
30 
 
Riverside County Redevelopment Agency, California, Tax Allocation Bonds, Jurupa Valley Project 
10/21 at 100.00 
35,205 
 
 
Area, Series 2011B, 6.500%, 10/01/25 
 
 
 
425 
 
Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A, 
No Opt. Call 
AA– 
458,108 
 
 
5.400%, 11/01/20 – NPFG Insured 
 
 
 
20 
 
San Clemente, California, Special Tax Revenue Bonds, Community Facilities District 2006-1 
9/25 at 100.00 
N/R 
21,097 
 
 
Marblehead Coastal, Series 2015, 5.000%, 9/01/40 
 
 
 
1,365 
 
San Diego County Regional Transportation Commission, California, Sales Tax Revenue Bonds, 
4/22 at 100.00 
AAA 
1,517,047 
 
 
Refunding Series 2012A, 5.000%, 4/01/42 
 
 
 
65 
 
San Francisco City and County Redevelopment Agency Successor Agency, California, Special Tax 
No Opt. Call 
N/R 
68,562 
 
 
Bonds, Community Facilities District 7, Hunters Point Shipyard Phase One Improvements, 
 
 
 
 
 
Refunding Series 2014, 5.000%, 8/01/39 
 
 
 
615 
 
San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment 
8/17 at 100.00 
AA– 
628,579 
 
 
Project, Series 2006C, 5.000%, 8/01/25 – NPFG Insured 
 
 
 
40 
 
Signal Hill Redevelopment Agency, California, Project 1 Tax Allocation Bonds, Series 2011, 
4/21 at 100.00 
N/R 
45,544 
 
 
7.000%, 10/01/26 
 
 
 
1,000 
 
Virgin Islands Public Finance Authority, Matching Fund Loan Notes Revenue Bonds, Series 2012A, 
10/22 at 100.00 
AA 
1,050,880 
 
 
5.000%, 10/01/32 – AGM Insured 
 
 
 
70 
 
Yorba Linda Redevelopment Agency, Orange County, California, Tax Allocation Revenue Bonds, 
9/21 at 100.00 
A– 
81,726 
 
 
Yorba Linda Redevelopment Project, Subordinate Lien Series 2011A, 6.500%, 9/01/32 
 
 
 
15,640 
 
Total Tax Obligation/Limited 
 
 
16,907,650 
 
 
Transportation – 6.8% 
 
 
 
530 
 
Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, 
1/24 at 100.00 
BB+ 
632,476 
 
 
Refunding Junior Lien Series 2013C, 6.500%, 1/15/43 
 
 
 
 
 
Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, 
 
 
 
 
 
Refunding Series 2013A: 
 
 
 
1,000 
 
5.000%, 1/15/42 – AGM Insured 
1/24 at 100.00 
AA 
1,095,960 
1,170 
 
5.750%, 1/15/46 
1/24 at 100.00 
BBB– 
1,338,667 
1,175 
 
6.000%, 1/15/53 
1/24 at 100.00 
BBB– 
1,360,086 
800 
 
Long Beach, California, Harbor Revenue Bonds, Series 2015D, 5.000%, 5/15/42 
5/25 at 100.00 
AA 
910,072 
955 
 
Port of Oakland, California, Revenue Bonds, Refunding Series 2012P, 5.000%, 5/01/31 
No Opt. Call 
A+ 
1,055,437 
 
 
(Alternative Minimum Tax) 
 
 
 
5,630 
 
Total Transportation 
 
 
6,392,698 
 
 
U.S. Guaranteed – 10.4% (5) 
 
 
 
2,805 
 
California Educational Facilities Authority, Revenue Bonds, Santa Clara University, Series 
4/18 at 100.00 
N/R (5) 
2,961,715 
 
 
2008A, 5.625%, 4/01/37 (Pre-refunded 4/01/18) 
 
 
 
210 
 
California State Public Works Board, Lease Revenue Bonds, Department of Corrections, 
No Opt. Call 
AA– (5) 
217,783 
 
 
Calipatria State Prison, Series 1991A, 6.500%, 9/01/17 – NPFG Insured (ETM) 
 
 
 
1,500 
 
California State Public Works Board, Lease Revenue Bonds, Various Capital Projects, Series 
11/19 at 100.00 
Aaa 
1,705,245 
 
 
2009-I, 6.375%, 11/01/34 (Pre-refunded 11/01/19) 
 
 
 
1,000 
 
Imperial Irrigation District, California, Electric System Revenue Bonds, Refunding Series 
11/20 at 100.00 
AA– (5) 
1,143,310 
 
 
2011A, 5.500%, 11/01/41 (Pre-refunded 11/01/20) 
 
 
 
 
 
Irvine Unified School District, California, Special Tax Bonds, Community Facilities District 
 
 
 
 
 
Series 2006A: 
 
 
 
55 
 
5.000%, 9/01/26 (Pre-refunded 9/01/18) 
9/18 at 100.00 
N/R (5) 
55,326 
130 
 
5.125%, 9/01/36 (Pre-refunded 9/01/18) 
9/18 at 100.00 
N/R (5) 
130,456 
540 
 
Loma Linda, California, Hospital Revenue Bonds, Loma Linda University Medical Center, Series 
12/17 at 100.00 
BB (5) 
575,386 
 
 
2008A, 8.250%, 12/01/38 (Pre-refunded 12/01/17) 
 
 
 
500 
 
Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2009, 
11/19 at 100.00 
Ba1 (5) 
568,130 
 
 
6.625%, 11/01/29 (Pre-refunded 11/01/19) 
 
 
 
415 
 
Pittsburg Redevelopment Agency, California, Tax Allocation Bonds, Los Medanos Community 
9/18 at 100.00 
BB+ (5) 
451,283 
 
 
Development Project, Refunding Series 2008A, 6.500%, 9/01/28 (Pre-refunded 9/01/18) 
 
 
 
160 
 
Rancho Santa Fe CSD Financing Authority, California, Revenue Bonds, Superior Lien Series 
9/21 at 100.00 
A– (5) 
188,333 
 
 
2011A, 5.750%, 9/01/30 (Pre-refunded 9/01/21) 
 
 
 
25 
 
San Francisco Redevelopment Finance Authority, California, Tax Allocation Revenue Bonds, 
2/21 at 100.00 
A– (5) 
29,957 
 
 
Mission Bay North Redevelopment Project, Series 2011C, 6.750%, 8/01/41 (Pre-refunded 2/01/21) 
 
 
 
 
 
San Francisco Redevelopment Financing Authority, California, Tax Allocation Revenue Bonds, 
 
 
 
 
 
Mission Bay South Redevelopment Project, Series 2011D: 
 
 
 
25 
 
7.000%, 8/01/33 (Pre-refunded 2/01/21) 
2/21 at 100.00 
BBB+ (5) 
30,203 
30 
 
7.000%, 8/01/41 (Pre-refunded 2/01/21) 
2/21 at 100.00 
BBB+ (5) 
36,243 
225 
 
San Mateo Union High School District, San Mateo County, California, Certificates of 
12/17 at 100.00 
N/R (5) 
233,651 
 
 
Participation, Phase 1, Series 2007A, 5.000%, 12/15/30 (Pre-refunded 12/15/17) – 
 
 
 
 
 
AMBAC Insured 
 
 
 
1,000 
 
Santa Clara Valley Transportation Authority, California, Sales Tax Revenue Bonds, 2000 Measure 
4/17 at 100.00 
AA+ (5) 
1,010,610 
 
 
A, Refunding Series 2007A, 5.000%, 4/01/36 (Pre-refunded 4/01/17) – AMBAC Insured 
 
 
 
360 
 
Turlock Public Financing Authority, California, Tax Allocation Revenue Bonds, Series 2011, 
3/21 at 100.00 
A– (5) 
442,224 
 
 
7.500%, 9/01/39 (Pre-refunded 3/01/21) 
 
 
 
8,980 
 
Total U.S. Guaranteed 
 
 
9,779,855 
 
 
Utilities – 0.9% 
 
 
 
645 
 
Long Beach Bond Finance Authority, California, Natural Gas Purchase Revenue Bonds, Series 
No Opt. Call 
786,210 
 
 
2007A, 5.500%, 11/15/37 
 
 
 
 
 
Water and Sewer – 11.3% 
 
 
 
1,000 
 
Bay Area Water Supply and Conservation Agency, California, Revenue Bonds, Capital Cost 
4/23 at 100.00 
AA– 
1,130,860 
 
 
Recovery Prepayment Program, Series 2013A, 5.000%, 10/01/34 
 
 
 
 
 
California Pollution Control Financing Authority, Water Furnishing Revenue Bonds, Poseidon 
 
 
 
 
 
Resources Channelside LP Desalination Project, Series 2012: 
 
 
 
375 
 
5.000%, 7/01/37 (Alternative Minimum Tax) 
No Opt. Call 
Baa3 
380,888 
1,160 
 
5.000%, 11/21/45 (Alternative Minimum Tax) 
No Opt. Call 
Baa3 
1,179,511 
2,000 
 
Escondido Joint Powers Financing Authority, California, Revenue Bonds, Water System Financing, 
3/22 at 100.00 
AA– 
2,220,180 
 
 
Series 2012, 5.000%, 9/01/41 
 
 
 
2,000 
 
Irvine Ranch Water District, California, Certificates of Participation, Irvine Ranch Water 
9/26 at 100.00 
AAA 
2,313,500 
 
 
District Series 2016, 5.000%, 3/01/41 
 
 
 
1,970 
 
Los Angeles Department of Water and Power, California, Waterworks Revenue Bonds, Series 2014A, 
7/24 at 100.00 
AA+ 
2,217,452 
 
 
5.000%, 7/01/44 
 
 
 
1,000 
 
Santa Clara Valley Water District, California, Water System Revenue Bonds, Refunding Series 
12/25 at 100.00 
Aa1 
1,181,210 
 
 
2016A, 5.000%, 6/01/31 
 
 
 
9,505 
 
Total Water and Sewer 
 
 
10,623,601 
$ 97,570 
 
Total Long-Term Investments (cost $85,582,131) 
 
 
92,521,535 
 
 
Other Assets Less Liabilities – 1.4% 
 
 
1,320,379 
 
 
Net Assets – 100% 
 
 
$ 93,841,914 
 


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 risk 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 
$ — 
$92,521,535 
$ — 
$92,521,535 
 
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.
As of December 31, 2016, the cost of investments was $85,520,023.
Gross unrealized appreciation and gross unrealized depreciation of investments as of December 31, 2016, were as follows:
Gross unrealized: 
 
Appreciation 
$7,488,207 
Depreciation 
(486,695) 
Net unrealized appreciation (depreciation) of investments 
$7,001,512 
 
     
(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. 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. Certain bonds backed by U.S. Government or 
 
 
agency securities are regarded as having an implied rating equal to the rating of such securities. 
(WI/DD) 
 
Investment, or portion of investment, purchased on a when-issued or delayed delivery basis. 
(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 California Select Tax-Free Income Portfolio 
 
By (Signature and Title) /s/ Gifford R. Zimmerman            
       Gifford R. Zimmerman
     Vice President and Secretary
                                         
Date:         March 1, 2017        
 
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, 2017        
 
By (Signature and Title) /s/ Stephen D. Foy                         
 
     Stephen D. Foy
     Vice President and Controller (principal financial officer)
                                                                                         
Date:         March 1, 2017