nq2.htm



 
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 811-6623
 
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)
 

Kevin J. McCarthy
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:         12/31/13         
 
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 (Unaudited)
     
           
   
   Nuveen California Select Tax-Free Income Portfolio (NXC)
     
   
December 31, 2013
     
 
 
Principal
   
Optional Call
   
Amount (000)
 
Description (1)
Provisions (2)
Ratings (3)
Value
   
LONG-TERM INVESTMENTS – 106.3%
     
   
MUNICIPAL BONDS – 106.3%
     
   
Consumer Staples – 3.8%
     
$ 95
 
California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma
6/15 at 100.00
BB+
$ 88,861
   
County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21
     
385
 
California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Revenue
3/14 at 100.00
A3
385,924
   
Bonds, Fresno County Tobacco Funding Corporation, Series 2002, 5.625%, 6/01/23
     
   
Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed
     
   
Bonds, Series 2007A-1:
     
1,065
 
5.750%, 6/01/47
6/17 at 100.00
B
791,497
385
 
5.125%, 6/01/47
6/17 at 100.00
B
261,889
1,095
 
Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed
6/22 at 100.00
B
788,280
   
Bonds, Series 2007A-2, 5.300%, 6/01/37
     
1,500
 
Tobacco Securitization Authority of Northern California, Tobacco Settlement Asset-Backed
6/15 at 100.00
B–
1,053,705
   
Bonds, Series 2005A-1, 5.500%, 6/01/45
     
4,525
 
Total Consumer Staples
   
3,370,156
   
Education and Civic Organizations – 3.9%
     
3,000
 
California Educational Facilities Authority, Revenue Bonds, Santa Clara University, Series
4/18 at 100.00
Aa3
3,184,980
   
2008A, 5.625%, 4/01/37
     
45
 
California Educational Facilities Authority, Revenue Bonds, University of Redlands, Series
10/15 at 100.00
A3
45,270
   
2005A, 5.000%, 10/01/35
     
35
 
California Educational Facilities Authority, Revenue Bonds, University of the Pacific, Series
11/15 at 100.00
A2
37,069
   
2006, 5.000%, 11/01/21
     
250
 
California Statewide Communities Development Authority, School Facility Revenue Bonds,
7/21 at 100.00
BBB–
263,228
   
Alliance College-Ready Public Schools, Series 2011A, 7.000%, 7/01/46
     
3,330
 
Total Education and Civic Organizations
   
3,530,547
   
Health Care – 10.0%
     
235
 
California Health Facilities Financing Authority, Revenue Bonds, Rady Children’s Hospital –
8/21 at 100.00
A1
239,493
   
San Diego, Series 2011, 5.250%, 8/15/41
     
2,550
 
California Health Facilities Financing Authority, Revenue Bonds, Sutter Health, Series 2007A,
11/16 at 100.00
AA–
2,538,831
   
5.250%, 11/15/46 (UB)
     
425
 
California Statewide Community Development Authority, Revenue Bonds, Childrens Hospital of Los
8/17 at 100.00
BBB+
380,141
   
Angeles, Series 2007, 5.000%, 8/15/47
     
545
 
California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente System,
8/16 at 100.00
A+
555,573
   
Series 2001C, 5.250%, 8/01/31
     
1,505
 
California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente System,
4/17 at 100.00
A+
1,490,837
   
Series 2007A, 4.750%, 4/01/33
     
540
 
Loma Linda, California, Hospital Revenue Bonds, Loma Linda University Medical Center, Series
12/17 at 100.00
BBB
585,625
   
2008A, 8.250%, 12/01/38
     
500
 
Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2009,
11/19 at 100.00
Baa3
512,420
   
6.625%, 11/01/29
     
1,100
 
Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2010,
11/20 at 100.00
Baa3
1,025,530
   
6.000%, 11/01/41
     
670
 
San Buenaventura, California, Revenue Bonds, Community Memorial Health System, Series 2011,
12/21 at 100.00
BB
730,789
   
7.500%, 12/01/41
     
800
 
Upland, California, Certificates of Participation, San Antonio Community Hospital, Series
1/21 at 100.00
A
866,952
   
2011, 6.500%, 1/01/41
     
8,870
 
Total Health Care
   
8,926,191
   
Housing/Multifamily – 0.9%
     
375
 
California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects
8/20 at 100.00
BBB
385,496
   
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
387,246
   
Series 2012A, 5.500%, 8/15/47
     
770
 
Total Housing/Multifamily
   
772,742
   
Housing/Single Family – 0.0%
     
40
 
California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%,
2/16 at 100.00
A–
41,843
   
8/01/30 – FGIC Insured (Alternative Minimum Tax)
     
   
Industrials – 1.2%
     
1,015
 
California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic
No Opt. Call
BBB+
1,081,371
   
Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)
     
   
Tax Obligation/General – 38.6%
     
1,650
 
California State, General Obligation Bonds, Various Purpose Series 2009, 5.500%, 11/01/39
11/19 at 100.00
A1
1,771,325
1,965
 
California State, General Obligation Bonds, Various Purpose Series 2011, 5.000%, 10/01/41
10/21 at 100.00
A1
1,993,846
2,000
 
California State, General Obligation Bonds, Various Purpose Series 2012, 5.250%, 4/01/35
4/22 at 100.00
A1
2,110,740
6,225
 
Escondido Union High School District, San Diego County, California, General Obligation
No Opt. Call
Aa2
1,800,146
   
Refunding Bonds, Series 2009, 0.000%, 8/01/36 – AGM Insured
     
   
Golden West Schools Financing Authority, California, General Obligation Revenue Refunding
     
   
Bonds, School District Program, Series 1999A:
     
4,650
 
0.000%, 8/01/16 – NPFG Insured
No Opt. Call
A
4,334,497
1,750
 
0.000%, 2/01/17 – NPFG Insured
No Opt. Call
A
1,589,123
2,375
 
0.000%, 8/01/17 – NPFG Insured
No Opt. Call
A
2,113,370
2,345
 
0.000%, 2/01/18 – NPFG Insured
No Opt. Call
A
2,044,043
   
Mountain View-Los Altos Union High School District, Santa Clara County, California, General
     
   
Obligation Capital Appreciation Bonds, Series 1995C:
     
1,015
 
0.000%, 5/01/17 – NPFG Insured
No Opt. Call
Aa1
980,084
1,080
 
0.000%, 5/01/18 – NPFG Insured
No Opt. Call
Aa1
1,015,502
   
Palomar Pomerado Health, California, General Obligation Bonds, Convertible Capital
     
   
Appreciation, Election 2004 Series 2010A:
     
10,825
 
0.000%, 8/01/34
No Opt. Call
A+
3,270,665
3,250
 
0.000%, 8/01/35
No Opt. Call
A+
920,693
3,220
 
Sacramento City Unified School District, Sacramento County, California, General Obligation
7/15 at 100.00
A1
3,369,149
   
Bonds, Series 2005, 5.000%, 7/01/27 – NPFG Insured
     
8,075
 
San Bernardino Community College District, California, General Obligation Bonds, Election of
No Opt. Call
Aa2
1,347,960
   
2008 Series 2009B, 0.000%, 8/01/44
     
7,560
 
Southwestern Community College District, San Diego County, California, General Obligation
No Opt. Call
Aa2
1,140,124
   
Bonds, Election of 2008, Series 2011C, 0.000%, 8/01/46
     
2,565
 
Sunnyvale School District, Santa Clara County, California, General Obligation Bonds, Series
9/15 at 100.00
AA
2,730,802
   
2005A, 5.000%, 9/01/26 – AGM Insured
     
4,250
 
West Hills Community College District, California, General Obligation Bonds, School Facilities
8/31 at 100.00
AA–
2,108,595
   
Improvement District 3, 2008 Election Series 2011, 0.000%, 8/01/38 – AGM Insured
     
64,800
 
Total Tax Obligation/General
   
34,640,664
   
Tax Obligation/Limited – 29.3%
     
1,000
 
Bell Community Redevelopment Agency, California, Tax Allocation Bonds, Bell Project Area,
3/14 at 100.00
N/R
844,500
   
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
A2
2,085,580
   
Rehabilitation, Various Correctional Facilities Series 2013F, 5.250%, 9/01/33
     
2,190
 
California State Public Works Board, Lease Revenue Bonds, Department of Corrections,
No Opt. Call
A
2,403,525
   
Calipatria State Prison, Series 1991A, 6.500%, 9/01/17 – NPFG Insured
     
1,500
 
California State Public Works Board, Lease Revenue Bonds, Various Capital Projects, Series
11/19 at 100.00
A2
1,715,325
   
2009-I, 6.375%, 11/01/34
     
120
 
Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community
9/15 at 100.00
A
121,330
   
Facilities District 98-2, Series 2005, 5.000%, 9/01/24 – FGIC Insured
     
360
 
Chino Redevelopment Agency, California, Merged Chino Redevelopment Project Area Tax Allocation
9/16 at 101.00
A–
346,640
   
Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured
     
2,000
 
Escondido Joint Powers Financing Authority, California, Revenue Bonds, Water System Financing,
3/22 at 100.00
AA–
1,982,100
   
Series 2012, 5.000%, 9/01/41
     
1,000
 
Fontana Public Financing Authority, California, Tax Allocation Revenue Bonds, North Fontana
10/15 at 100.00
A
991,510
   
Redevelopment Project, Series 2005A, 5.000%, 10/01/32 – AMBAC Insured
     
270
 
Fontana Redevelopment Agency, Jurupa Hills Redevelopment Project, California, Tax Allocation
4/14 at 100.00
A–
270,219
   
Refunding Bonds, 1997 Series A, 5.500%, 10/01/27
     
250
 
Inglewood Redevelopment Agency, California, Tax Allocation Bonds, Merged Redevelopment
5/17 at 100.00
BBB+
246,140
   
Project, Subordinate Lien Series 2007A-1, 5.000%, 5/01/23 – AMBAC Insured
     
   
Irvine Unified School District, California, Special Tax Bonds, Community Facilities District
     
   
Series 2006A:
     
55
 
5.000%, 9/01/26
9/16 at 100.00
N/R
55,276
130
 
5.125%, 9/01/36
9/16 at 100.00
N/R
124,692
1,215
 
Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester
9/15 at 100.00
A1
1,230,126
   
Social Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured
     
135
 
National City Community Development Commission, California, Tax Allocation Bonds, National
8/21 at 100.00
A–
158,256
   
City Redevelopment Project, Series 2011, 6.500%, 8/01/24
     
280
 
Norco Redevelopment Agency, California, Tax Allocation Bonds, Project Area 1, Refunding,
3/14 at 100.00
N/R
257,978
   
School District Pass-Through, Series 2004, 5.000%, 3/01/32 – RAAI Insured
     
1,000
 
Norco Redevelopment Agency, California, Tax Allocation Bonds, Project Area 1, Series 2009,
3/18 at 100.00
A
1,101,120
   
7.000%, 3/01/34
     
50
 
Novato Redevelopment Agency, California, Tax Allocation Bonds, Hamilton Field Redevelopment
9/21 at 100.00
BBB+
54,220
   
Project, Series 2011, 6.750%, 9/01/40
     
1,300
 
Orange County, California, Special Tax Bonds, Community Facilities District 03-1 of Ladera
No Opt. Call
N/R
1,300,195
   
Ranch, Series 2004A, 5.625%, 8/15/34
     
   
Patterson Public Finance 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
340,134
320
 
5.750%, 9/01/39
9/23 at 100.00
N/R
317,005
60
 
Patterson Public Finance Authority, California, Revenue Bonds, Community Facilities District 2001-1,
9/23 at 100.00
N/R
58,864
   
Subordinate Lien Series 2013B , 5.875%, 9/01/39
     
   
Perris Union High School District Financing Authority, Riverside County, California, Revenue
     
   
Bonds, Series 2011:
     
50
 
6.000%, 9/01/33
9/14 at 100.00
N/R
50,669
100
 
6.125%, 9/01/41
9/14 at 100.00
N/R
100,505
415
 
Pittsburg Redevelopment Agency, California, Tax Allocation Bonds, Los Medanos Community
9/18 at 100.00
BBB–
425,919
   
Development Project, Refunding Series 2008A, 6.500%, 9/01/28
     
160
 
Rancho Santa Fe CSD Financing Authority, California, Revenue Bonds, Superior Lien Series
9/21 at 100.00
BBB+
167,552
   
2011A, 5.750%, 9/01/30
     
30
 
Riverside County Redevelopment Agency, California, Tax Allocation Bonds, Jurupa Valley Project
10/21 at 100.00
A–
32,889
   
Area, Series 2011B, 6.500%, 10/01/25
     
605
 
Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A,
No Opt. Call
A
678,592
   
5.400%, 11/01/20 – NPFG Insured
     
1,365
 
San Diego County Regional Transportation Commission, California, Sales Tax Revenue Bonds,
4/22 at 100.00
AAA
1,426,821
   
Series 2012A, 5.000%, 4/01/42
     
25
 
San Francisco Redevelopment Finance Authority, California, Tax Allocation Revenue Bonds,
2/21 at 100.00
A–
27,920
   
Mission Bay North Redevelopment Project, Series 2011C, 6.750%, 8/01/41
     
   
San Francisco Redevelopment Financing Authority, California, Tax Allocation Revenue Bonds,
     
   
Mission Bay South Redevelopment Project, Series 2011D:
     
25
 
7.000%, 8/01/33
2/21 at 100.00
BBB
26,855
30
 
7.000%, 8/01/41
2/21 at 100.00
BBB
31,771
615
 
San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment
8/17 at 100.00
A
621,396
   
Project, Series 2006C, 5.000%, 8/01/25 – NPFG Insured
     
3,000
 
San Mateo County Transit District, California, Sales Tax Revenue Bonds, Series 2005A, 5.000%,
6/15 at 100.00
AA
3,192,659
   
6/01/21 – NPFG Insured
     
1,000
 
Santa Clara County Board of Education, California, Certificates of Participation, Series 2002,
3/14 at 100.00
A
994,400
   
5.000%, 4/01/25 – NPFG Insured
     
1,000
 
Santa Clara Valley Transportation Authority, California, Sales Tax Revenue Bonds, Series
4/17 at 100.00
AA+
1,044,800
   
2007A, 5.000%, 4/01/36 – AMBAC Insured
     
40
 
Signal Hill Redevelopment Agency, California, Project 1 Tax Allocation Bonds, Series 2011,
4/21 at 100.00
N/R
41,936
   
7.000%, 10/01/26
     
1,000
 
Travis Unified School District, Solano County, California, Certificates of Participation,
9/16 at 100.00
Baa1
1,003,020
   
Series 2006, 5.000%, 9/01/26 – FGIC Insured
     
360
 
Turlock Public Financing Authority, California, Tax Allocation Revenue Bonds, Series 2011,
3/21 at 100.00
BBB+
377,766
   
7.500%, 9/01/39
     
70
 
Yorba Linda Redevelopment Agency, Orange County, California, Tax Allocation Revenue Bonds,
9/21 at 100.00
A–
78,553
   
Yorba Linda Redevelopment Project, Subordinate Lien Series 2011A, 6.500%, 9/01/32
     
25,475
 
Total Tax Obligation/Limited
   
26,328,758
   
Transportation – 5.4%
     
1,150
 
Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series
7/14 at 100.00
BBB–
1,046,258
   
1995A, 5.000%, 1/01/35
     
530
 
Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding
1/24 at 100.00
BB+
528,951
   
Bonds, Junior Lien Series 2013C, 6.500%, 1/15/43 (WI/DD, Settling 1/02/14)
     
   
Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding
     
   
Bonds, Series 2013A:
     
1,170
 
5.750%, 1/15/46 (WI/DD, Settling 1/02/14)
1/24 at 100.00
BBB–
1,134,210
1,175
 
6.000%, 1/15/53 (WI/DD, Settling 1/02/14)
1/24 at 100.00
BBB–
1,135,532
955
 
Port of Oakland, California, Reveue Refunding Bonds, Series 2012P, 5.000%, 5/01/31
No Opt. Call
A+
966,622
   
(Alternative Minimum Tax)
     
4,980
 
Total Transportation
   
4,811,573
   
U.S. Guaranteed – 3.3% (4)
     
1,000
 
California State Public Works Board, Lease Revenue Bonds, Department of Mental Health,
6/14 at 100.00
AAA
1,021,980
   
Coalinga State Hospital, Series 2004A, 5.500%, 6/01/23 (Pre-refunded 6/01/14)
     
750
 
California State, General Obligation Bonds, Series 2004, 5.000%, 2/01/23 (Pre-refunded 2/01/14)
2/14 at 100.00
A1 (4)
753,045
800
 
California State, General Obligation Bonds, Series 2004, 5.125%, 2/01/27 (Pre-refunded 2/01/14)
No Opt. Call
AA+ (4)
803,344
100
 
Roseville Joint Union High School District, Placer County, California, General Obligation
8/15 at 100.00
AA (4)
107,518
   
Bonds, Series 2006B, 5.000%, 8/01/27 (Pre-refunded 8/01/15) – FGIC Insured
     
225
 
San Mateo Union High School District, San Mateo County, California, Certificates of
12/17 at 100.00
N/R (4)
261,758
   
Participation, Phase 1, Series 2007A, 5.000%, 12/15/30 (Pre-refunded 12/15/17) –
     
   
AMBAC Insured
     
2,875
 
Total U.S. Guaranteed
   
2,947,645
   
Utilities – 6.9%
     
1,000
 
Imperial Irrigation District, California, Electric System Revenue Bonds, Refunding Series
11/20 at 100.00
AA–
1,040,299
   
2011A, 5.500%, 11/01/41
     
645
 
Long Beach Bond Finance Authority, California, Natural Gas Purchase Revenue Bonds, Series
No Opt. Call
A
665,543
   
2007A, 5.500%, 11/15/37
     
7,600
 
Merced Irrigation District, California, Certificates of Participation, Water and Hydroelectric
9/16 at 64.56
A
4,305,552
   
Series 2008B, 0.000%, 9/01/23
     
215
 
Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%,
9/15 at 100.00
N/R
213,873
   
9/01/31 – SYNCORA GTY Insured
     
9,460
 
Total Utilities
   
6,225,267
   
Water and Sewer – 3.0%
     
1,000
 
Bay Area Water Supply and Conservation Agency, California, Revenue Bonds, Capital Cost
4/23 at 100.00
AA–
1,049,780
   
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:
     
535
 
5.000%, 7/01/37 (Alternative Minimum Tax)
No Opt. Call
Baa3
459,650
1,000
 
5.000%, 11/21/45 (Alternative Minimum Tax)
No Opt. Call
Baa3
803,800
150
 
Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,
4/16 at 100.00
AA–
151,697
   
5.000%, 4/01/36 – NPFG Insured
     
250
 
Sacramento County Sanitation District Financing Authority, California, Revenue Bonds, Series
6/16 at 100.00
AA
261,660
   
2006, 5.000%, 12/01/31 – FGIC Insured
     
2,935
 
Total Water and Sewer
   
2,726,587
$ 129,075
 
Total Long-Term Investments (cost $93,027,068)
   
95,403,344
   
Floating Rate Obligations – (1.7)%
   
(1,540,000)
   
Other Assets Less Liabilities – (4.6)%
   
(4,129,118)
   
Net Assets – 100%
   
$ 89,734,226
 
 
 
 
 

 
 

Fair Value Measurements
 
Fair value is defined as the price that the Fund would receive 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
$ —
$95,403,344
$ —
$95,403,344
 
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, 2013, the cost of investments was $91,458,441.
 
Gross unrealized appreciation and gross unrealized depreciation of investments as of December 31, 2013, were as follows:
 
   
Gross unrealized:
 
   Appreciation
$ 4,923,301
   Depreciation
(2,522,719)
Net unrealized appreciation (depreciation) of investments
$ 2,400,582
 
 
     
(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)
 
Ratings: Using the highest of Standard & Poor’s Group (“Standard & Poor’s”), Moody’s Investors Service,
   
Inc. (“Moody’s”) or Fitch, Inc. (“Fitch”) rating. Ratings below BBB by Standard & Poor’s, Baa by Moody’s or
   
BBB by Fitch are considered to be below investment grade. Holdings designated N/R are not rated by any
   
of these national rating agencies.
(4)
 
Backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency securities,
   
which ensure the timely payment of principal and interest. 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.
(UB)
 
Underlying bond of an inverse floating rate trust reflected as a financing transaction.
 
 
 

 
 
 
 

 
 
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/ Kevin J. McCarthy                    
                                                   Kevin J. McCarthy
                                                   Vice President and Secretary
 
Date:         February 28, 2014        
 
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/ Gifford R. Zimmerman                    
                                                    Gifford R. Zimmerman
                                                  Chief Administrative Officer (principal executive officer) 
 
Date:         February 28, 2014        
 
By (Signature and Title)     /s/ Stephen D. Foy                              
                                                   Stephen D. Foy
                                                  Vice President and Controller (principal financial officer) 
 
Date:         February 28, 2014