Unassociated Document



 
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 811-6548
 
Nuveen 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:         12/31/09         
 
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 Select Tax-Free Income Portfolio (NXP)       
     December 31, 2009       
Principal    Optional Call     
Amount (000)  Description (1)  Provisions (2)  Ratings (3)  Value 
  Municipal Bonds – 98.2%       
  Alaska – 1.9%       
$    2,475  Alaska Municipal Bond Bank Authority, General Obligation Bonds, Series 2003E, 5.250%, 12/01/23  12/13 at 100.00  A+ (4)  $    2,861,273 
  (Pre-refunded 12/01/13) – MBIA Insured       
2,500  Northern Tobacco Securitization Corporation, Alaska, Tobacco Settlement Asset-Backed Bonds,  6/14 at 100.00  Baa3  1,653,475 
  Series 2006A, 5.000%, 6/01/46       
4,975  Total Alaska      4,514,748 
  Arkansas – 0.4%       
5,915  Arkansas Development Finance Authority, Tobacco Settlement Revenue Bonds, Arkansas Cancer  No Opt. Call  Aa3  824,492 
  Research Center Project, Series 2006, 0.000%, 7/01/46 – AMBAC Insured       
  California – 5.9%       
2,000  Alameda Corridor Transportation Authority, California, Subordinate Lien Revenue Bonds, Series  10/17 at 100.00  A–  1,569,740 
  2004A, 0.000%, 10/01/25 – AMBAC Insured       
3,325  California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A,  5/12 at 101.00  AA–  3,701,889 
  6.000%, 5/01/14       
1,000  California Statewide Community Development Authority, Revenue Bonds, Methodist Hospital  8/19 at 100.00  AA  1,077,410 
  Project, Series 2009, 6.750%, 2/01/38       
2,645  Cypress Elementary School District, San Bernardino County, California, General Obligation  No Opt. Call  AAA  576,478 
  Bonds, Series 2009A, 0.000%, 5/01/34 – FSA Insured       
3,000  Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed  6/13 at 100.00  AAA  3,523,500 
  Bonds, Series 2003A-1, 6.750%, 6/01/39 (Pre-refunded 6/01/13)       
1,130  Los Angeles Department of Water and Power, California, Waterworks Revenue Refunding Bonds,  7/11 at 100.00  AA  1,135,526 
  Series 2001A, 5.125%, 7/01/41 – FGIC Insured       
365  Los Angeles, California, Parking System Revenue Bonds, Series 1999A, 5.250%, 5/01/29 –  5/10 at 100.00  A+  367,362 
  AMBAC Insured       
1,000  Moreno Valley Unified School District, Riverside County, California, General Obligation Bonds,  No Opt. Call  A  431,920 
  Series 2007, 0.000%, 8/01/23 – NPFG Insured       
590  Palomar Pomerado Health, Calfornia, Certificates of Participation, Series 2009, 6.750%, 11/01/39  11/19 at 100.00  Baa2  584,838 
750  Tobacco Securitization Authority of Northern California, Tobacco Settlement Asset-Backed  6/15 at 100.00  BBB  539,438 
  Bonds, Series 2005A-1, 5.500%, 6/01/45       
1,150  Woodside Elementary School District, San Mateo County, California, General Obligation Bonds,  No Opt. Call  AA+  308,925 
  Series 2007, 0.000%, 10/01/30 – AMBAC Insured       
16,955  Total California      13,817,026 
  Colorado – 11.3%       
1,700  Colorado Health Facilities Authority, Revenue Bonds, Catholic Health Initiatives, Series  3/12 at 100.00  AA (4)  1,851,215 
  2002A, 5.500%, 3/01/22 (ETM)       
690  Colorado Health Facilities Authority, Revenue Bonds, Catholic Health Initiatives, Series  3/12 at 100.00  AA (4)  758,558 
  2002A, 5.500%, 3/01/22 (Pre-refunded 3/01/12)       
390  Colorado Water Resources and Power Development Authority, Small Water Resources Revenue Bonds,  11/10 at 100.00  A  393,038 
  Series 2000A, 5.800%, 11/01/20 – FGIC Insured       
6,815  Denver City and County, Colorado, Airport System Revenue Bonds, Series 1991D, 7.750%, 11/15/13  No Opt. Call  A+  7,557,017 
  (Alternative Minimum Tax)       
5,000  Denver City and County, Colorado, Airport System Revenue Refunding Bonds, Series 2001A,  11/11 at 100.00  A+  5,154,400 
  5.625%, 11/15/17 – FGIC Insured (Alternative Minimum Tax)       
3,000  Denver Convention Center Hotel Authority, Colorado, Senior Revenue Bonds, Convention Center  12/13 at 100.00  N/R (4)  3,392,790 
  Hotel, Series 2003A, 5.000%, 12/01/23 (Pre-refunded 12/01/13) – SYNCORA GTY Insured       
500  Denver, Colorado, Airport System Revenue Refunding Bonds, Series 2003B, 5.000%, 11/15/33 –  11/13 at 100.00  A+  498,590 
  SYNCORA GTY Insured       
5,000  E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2000B, 0.000%, 9/01/28  9/10 at 31.42  Aaa  1,565,050 
  (Pre-refunded 9/01/10) – NPFG Insured       
12,500  E-470 Public Highway Authority, Colorado, Toll Revenue Bonds, Series 2006A, 0.000%, 9/01/38 –  9/26 at 54.77  A  1,678,625 
  NPFG Insured       
3,160  Northwest Parkway Public Highway Authority, Colorado, Revenue Bonds, Senior Series 2001A,  6/11 at 102.00  N/R (4)  3,443,326 
  5.500%, 6/15/20 (Pre-refunded 6/15/11) – AMBAC Insured       
38,755  Total Colorado      26,292,609 
  District of Columbia – 0.0%       
60  District of Columbia, Revenue Bonds, Catholic University of America, Series 1999, 5.625%,  4/10 at 101.00  A  60,632 
  10/01/29 – AMBAC Insured       
  Florida – 7.5%       
2,000  Halifax Hospital Medical Center, Florida, Revenue Bonds, Series 2006, 5.375%, 6/01/46  6/16 at 100.00  A–  1,876,780 
5,000  Jacksonville Health Facilities Authority, Florida, Revenue Bonds, Ascension Health, Series  11/12 at 101.00  Aa1  5,083,650 
  2002A, 5.250%, 11/15/32       
10,000  JEA St. John’s River Power Park System, Florida, Revenue Refunding Bonds, Issue 2, Series  10/11 at 100.00  Aa2  10,594,000 
  2002-17, 5.000%, 10/01/17       
17,000  Total Florida      17,554,430 
  Illinois – 13.9%       
1,965  Board of Trustees of Southern Illinois University, Housing and Auxiliary Facilities System  No Opt. Call  A  1,171,513 
  Revenue Bonds, Series 1999A, 0.000%, 4/01/20 – NPFG Insured       
2,600  Chicago Heights, Illinois, General Obligation Corporate Purpose Bonds, Series 1993, 5.650%,  6/10 at 100.00  A  2,653,248 
  12/01/17 – FGIC Insured       
195  DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds,  11/13 at 100.00  Aa3  213,954 
  Series 2003B, 5.250%, 11/01/20 – FSA Insured       
805  DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds,  11/13 at 100.00  Aa3 (4)  924,526 
  Series 2003B, 5.250%, 11/01/20 (Pre-refunded 11/01/13) – FSA Insured       
600  Illinois Educational Facilities Authority, Student Housing Revenue Bonds, Educational  5/12 at 101.00  Aaa  675,498 
  Advancement Foundation Fund, University Center Project, Series 2002, 6.000%, 5/01/22       
  (Pre-refunded 5/01/12)       
1,050  Illinois Finance Authority, Revenue Bonds, Loyola University of Chicago, Tender Option Bond  7/17 at 100.00  AA  1,082,277 
  Trust 1137, 9.082%, 7/01/46 (IF)       
4,000  Illinois Finance Authority, Revenue Bonds, Northwestern Memorial Hospital, Series 2004A,  8/14 at 100.00  N/R (4)  4,695,800 
  5.500%, 8/15/43 (Pre-refunded 8/15/14)       
1,000  Illinois Finance Authority, Revenue Bonds, Silver Cross Hospital and Medical Centers, Series  8/19 at 100.00  BBB  1,053,460 
  2009, 6.875%, 8/15/38       
2,100  Illinois Finance Authority, Revenue Refunding Bonds, Silver Cross Hospital and Medical  8/18 at 100.00  BBB  1,891,722 
  Centers, Series 2008A, 5.500%, 8/15/30       
1,320  Illinois Health Facilities Authority, Revenue Bonds, Decatur Memorial Hospital, Series 2001,  10/11 at 100.00  A  1,348,868 
  5.600%, 10/01/16       
2,950  Illinois Health Facilities Authority, Revenue Bonds, Lake Forest Hospital, Series 2002A,  7/12 at 100.00  A–  3,042,276 
  6.000%, 7/01/17       
2,275  Illinois Health Facilities Authority, Revenue Refunding Bonds, Elmhurst Memorial Healthcare,  1/13 at 100.00  Baa1  2,341,840 
  Series 2002, 6.250%, 1/01/17       
100  Illinois Health Facilities Authority, Revenue Refunding Bonds, Rockford Health System, Series  3/10 at 100.00  N/R  89,851 
  1997, 5.000%, 8/15/21 – AMBAC Insured       
3,125  Metropolitan Pier and Exposition Authority, Illinois, Revenue Bonds, McCormick Place Expansion  No Opt. Call  A  2,332,469 
  Project, Series 1992A, 0.000%, 6/15/17 – FGIC Insured       
810  Metropolitan Pier and Exposition Authority, Illinois, Revenue Bonds, McCormick Place Expansion  No Opt. Call  AAA  270,726 
  Project, Series 2002A, 0.000%, 6/15/30 – NPFG Insured       
5,000  Metropolitan Pier and Exposition Authority, Illinois, Revenue Refunding Bonds, McCormick Place  6/12 at 101.00  AAA  5,190,650 
  Expansion Project, Series 2002B, 5.000%, 6/15/21 – NPFG Insured       
1,300  Schaumburg, Illinois, General Obligation Bonds, Series 2004B, 5.250%, 12/01/34 – FGIC Insured  12/14 at 100.00  AA+  1,345,825 
  Yorkville, Illinois, General Obligation Debt Certificates, Series 2003:       
1,000  5.000%, 12/15/19 (Pre-refunded 12/15/11) – RAAI Insured  12/11 at 100.00  N/R (4)  1,085,410 
1,000  5.000%, 12/15/20 (Pre-refunded 12/15/11) – RAAI Insured  12/11 at 100.00  N/R (4)  1,085,410 
33,195  Total Illinois      32,495,323 
  Indiana – 6.8%       
1,000  Franklin Community Multi-School Building Corporation, Marion County, Indiana, First Mortgage  7/14 at 100.00  A (4)  1,153,200 
  Revenue Bonds, Series 2004, 5.000%, 7/15/22 (Pre-refunded 7/15/14) – FGIC Insured       
1,770  Indiana Health Facility Financing Authority, Hospital Revenue Refunding Bonds, Columbus  No Opt. Call  AAA  2,027,606 
  Regional Hospital, Series 1993, 7.000%, 8/15/15 – FSA Insured       
1,000  Indiana Health Facility Financing Authority, Revenue Bonds, Community Foundation of Northwest  3/17 at 100.00  BBB  959,130 
  Indiana, Series 2007, 5.500%, 3/01/37       
9,855  Indianapolis Local Public Improvement Bond Bank, Indiana, Waterworks Project, Series 2002A,  7/12 at 100.00  AAA  10,911,752 
  5.125%, 7/01/21 (Pre-refunded 7/01/12) – NPFG Insured       
750  West Clark 2000 School Building Corporation, Clark County, Indiana, First Mortgage Bonds,  1/15 at 100.00  AA+  782,100 
  Series 2005, 5.000%, 7/15/22 – NPFG Insured       
14,375  Total Indiana      15,833,788 
  Iowa – 1.8%       
1,000  Iowa Tobacco Settlement Authority, Asset Backed Settlement Revenue Bonds, Series 2005C,  6/15 at 100.00  BBB  733,260 
  5.375%, 6/01/38       
4,000  Iowa Tobacco Settlement Authority, Tobacco Asset-Backed Revenue Bonds, Series 2005B,  6/17 at 100.00  BBB  3,500,360 
  5.600%, 6/01/34       
5,000  Total Iowa      4,233,620 
  Kansas – 0.5%       
500  Lawrence, Kansas, Hospital Revenue Bonds, Lawrence Memorial Hospital, Series 2006,  7/16 at 100.00  A3  456,025 
  4.875%, 7/01/36       
750  Wamego, Kansas, Pollution Control Revenue Bonds, Kansas Gas and Electric Company, Series 2004,  6/14 at 100.00  A  762,945 
  5.300%, 6/01/31 – NPFG Insured       
1,250  Total Kansas      1,218,970 
  Kentucky – 0.5%       
1,100  Jefferson County, Kentucky, Health System Revenue Bonds, Alliant Health System Inc., Series  3/10 at 100.50  A (4)  1,109,427 
  1998, 5.125%, 10/01/18 – MBIA Insured (ETM)       
  Louisiana – 0.4%       
1,100  Tobacco Settlement Financing Corporation, Louisiana, Tobacco Settlement Asset-Backed Bonds,  5/11 at 101.00  BBB  1,017,038 
  Series 2001B, 5.875%, 5/15/39       
  Massachusetts – 2.2%       
500  Massachusetts Health and Educational Facilities Authority, Revenue Bonds, CareGroup Inc.,  7/18 at 100.00  A3  481,310 
  Series 2008E-1, 5.000%, 7/01/28       
20  Massachusetts Health and Educational Facilities Authority, Revenue Bonds, Partners HealthCare  7/11 at 101.00  AA  21,392 
  System Inc., Series 2001C, 6.000%, 7/01/17       
480  Massachusetts Health and Educational Facilities Authority, Revenue Bonds, Partners HealthCare  7/11 at 101.00  AAA  523,824 
  System Inc., Series 2001C, 6.000%, 7/01/17 (Pre-refunded 7/01/11)       
1,985  Massachusetts Housing Finance Agency, Housing Bonds, Series 2009F, 5.700%, 6/01/40  12/18 at 100.00  AA–  1,991,769 
1,055  Massachusetts Turnpike Authority, Metropolitan Highway System Revenue Bonds, Senior Series  1/10 at 100.00  A  1,030,556 
  1997A, 5.000%, 1/01/37 – NPFG Insured       
1,045  Massachusetts Turnpike Authority, Metropolitan Highway System Revenue Bonds, Subordinate  1/10 at 100.00  AA  1,033,954 
  Series 1999A, 5.000%, 1/01/39 – AMBAC Insured       
5,085  Total Massachusetts      5,082,805 
  Michigan – 1.6%       
1,000  Michigan State Hospital Finance Authority, Hospital Revenue Bonds, Detroit Medical Center  2/10 at 100.00  BB–  893,190 
  Obligated Group, Series 1998A, 5.125%, 8/15/18       
2,900  Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds, Trinity Health  12/12 at 100.00  AA  2,914,210 
  Credit Group, Series 2002C, 5.375%, 12/01/30       
3,900  Total Michigan      3,807,400 
  Missouri – 0.7%       
5,000  Kansas City Municipal Assistance Corporation, Missouri, Leasehold Revenue Bonds, Series  No Opt. Call  AA–  1,557,850 
  2004B-1, 0.000%, 4/15/30 – AMBAC Insured       
  Nevada – 4.7%       
2,500  Clark County, Nevada, Motor Vehicle Fuel Tax Highway Improvement Revenue Bonds, Series 2003,  7/13 at 100.00  AA–  2,567,750 
  5.000%, 7/01/23 – AMBAC Insured       
  Director of Nevada State Department of Business and Industry, Revenue Bonds, Las Vegas       
  Monorail Project, First Tier, Series 2000:       
2,360  0.000%, 1/01/21 – AMBAC Insured  No Opt. Call  Caa2  339,297 
4,070  0.000%, 1/01/22 – AMBAC Insured  No Opt. Call  Caa2  591,656 
6,025  5.375%, 1/01/40 – AMBAC Insured  1/10 at 100.00  Caa2  1,541,014 
1,500  Las Vegas Redevelopment Agency, Nevada, Tax Increment Revenue Bonds, Series 2009A,  6/19 at 100.00  A  1,677,270 
  8.000%, 6/15/30       
1,515  Reno, Nevada, Capital Improvement Revenue Bonds, Series 2002, 5.500%, 6/01/21 – FGIC Insured  6/12 at 100.00  A  1,531,559 
2,555  Reno, Nevada, Capital Improvement Revenue Bonds, Series 2002, 5.500%, 6/01/21 (Pre-refunded  6/12 at 100.00  Baa1 (4)  2,839,755 
  6/01/12) – FGIC Insured       
20,525  Total Nevada      11,088,301 
  New Hampshire – 0.2%       
380  New Hampshire Housing Finance Authority, Single Family Mortgage Acquisition Bonds, Series  5/11 at 100.00  Aa2  385,723 
  2001A, 5.600%, 7/01/21 (Alternative Minimum Tax)       
  New Jersey – 2.7%       
2,500  New Jersey Health Care Facilities Financing Authority, Revenue Bonds, Somerset Medical Center,  7/13 at 100.00  Ba2  2,106,325 
  Series 2003, 5.500%, 7/01/23       
  Tobacco Settlement Financing Corporation, New Jersey, Tobacco Settlement Asset-Backed Bonds,       
  Series 2002:       
1,325  5.750%, 6/01/32 (Pre-refunded 6/01/12)  6/12 at 100.00  AAA  1,439,202 
1,000  6.000%, 6/01/37 (Pre-refunded 6/01/12)  6/12 at 100.00  AAA  1,121,840 
2,500  Tobacco Settlement Financing Corporation, New Jersey, Tobacco Settlement Asset-Backed Bonds,  6/17 at 100.00  BBB  1,731,100 
  Series 2007-1A, 5.000%, 6/01/41       
7,325  Total New Jersey      6,398,467 
  New Mexico – 2.2%       
1,000  New Mexico Mortgage Finance Authority, Multifamily Housing Revenue Bonds, St Anthony, Series  9/17 at 100.00  AAA  980,020 
  2007A, 5.250%, 9/01/42 (Alternative Minimum Tax)       
4,000  University of New Mexico, FHA-Insured Mortgage Hospital Revenue Bonds, Series 2004, 4.625%,  7/14 at 100.00  AAA  4,057,600 
  7/01/25 – FSA Insured       
5,000  Total New Mexico      5,037,620 
  New York – 1.2%       
1,000  Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Kaleida  2/14 at 100.00  AAA  1,041,770 
  Health, Series 2004, 5.050%, 2/15/25       
1,215  Dormitory Authority of the State of New York, Revenue Bonds, Mount Sinai NYU Health Obligated  7/10 at 101.00  A2  1,243,200 
  Group, Series 2000A, 6.500%, 7/01/17       
385  Dormitory Authority of the State of New York, Revenue Bonds, Mount Sinai NYU Health Obligated  7/10 at 101.00  A2 (4)  399,295 
  Group, Series 2000A, 6.500%, 7/01/17 (Pre-refunded 7/01/10)       
2,600  Total New York      2,684,265 
  North Carolina – 1.7%       
1,000  North Carolina Eastern Municipal Power Agency, Power System Revenue Bonds, Series 2008C,  1/19 at 100.00  A–  1,165,820 
  6.750%, 1/01/24       
2,195  North Carolina Eastern Municipal Power Agency, Power System Revenue Refunding Bonds, Series  3/10 at 100.00  A–  2,196,888 
  1993B, 5.500%, 1/01/21       
500  Raleigh Durham Airport Authority, North Carolina, Airport Revenue Bonds, Series 2001A, 5.250%,  5/11 at 101.00  Aa3  516,720 
  11/01/17 – FGIC Insured       
3,695  Total North Carolina      3,879,428 
  Ohio – 0.6%       
1,500  Buckeye Tobacco Settlement Financing Authority, Ohio, Tobacco Settlement Asset-Backed Revenue  6/17 at 100.00  BBB  1,181,265 
  Bonds, Senior Lien, Series 2007A-2, 6.000%, 6/01/42       
300  Lebanon, Ohio, Electric System Mortgage Revenue Bonds, Series 2001, 5.500%, 12/01/17  12/10 at 101.00  A2 (4)  317,322 
  (Pre-refunded 12/01/10) – AMBAC Insured       
1,800  Total Ohio      1,498,587 
  Oklahoma – 2.0%       
1,000  Norman Regional Hospital Authority, Oklahoma, Hospital Revenue Bonds, Series 2005,  9/16 at 100.00  BB+  779,990 
  5.375%, 9/01/36       
4,000  Oklahoma Development Finance Authority, Revenue Bonds, St. John Health System, Series 2004,  2/14 at 100.00  A  4,001,240 
  5.000%, 2/15/24       
5,000  Total Oklahoma      4,781,230 
  Pennsylvania – 0.5%       
500  Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, Widener University,  7/13 at 100.00  BBB+  501,090 
  Series 2003, 5.250%, 7/15/24       
700  Pennsylvania Turnpike Commission, Turnpike Revenue Bonds, Series 2004A, 5.500%, 12/01/31 –  12/14 at 100.00  Aa3  719,663 
  AMBAC Insured       
1,200  Total Pennsylvania      1,220,753 
  Puerto Rico – 0.4%       
1,000  Puerto Rico Sales Tax Financing Corporation, Sales Tax Revenue Bonds, First Subordinate Series  8/19 at 100.00  A+  1,039,070 
  2009A, 6.000%, 8/01/42       
  South Carolina – 7.9%       
1,250  Dorchester County School District 2, South Carolina, Installment Purchase Revenue Bonds,  12/14 at 100.00  AA–  1,315,363 
  GROWTH, Series 2004, 5.250%, 12/01/20       
10,000  Greenville County School District, South Carolina, Installment Purchase Revenue Bonds, Series  12/12 at 101.00  AA (4)  11,525,696 
  2002, 5.875%, 12/01/19 (Pre-refunded 12/01/12)       
1,500  Lexington County Health Service District, South Carolina, Hospital Revenue Refunding and  11/13 at 100.00  A+ (4)  1,772,085 
  Improvement Bonds, Series 2003, 6.000%, 11/01/18 (Pre-refunded 11/01/13)       
520  South Carolina JOBS Economic Development Authority, Economic Development Revenue Bonds, Bon  11/12 at 100.00  A3 (4)  587,366 
  Secours Health System Inc., Series 2002A, 5.625%, 11/15/30 (Pre-refunded 11/15/12)       
1,980  South Carolina JOBS Economic Development Authority, Economic Development Revenue Bonds, Bon  11/12 at 100.00  A–  1,954,735 
  Secours Health System Inc., Series 2002B, 5.625%, 11/15/30       
1,130  Tobacco Settlement Revenue Management Authority, South Carolina, Tobacco Settlement  5/12 at 100.00  BBB (4)  1,181,347 
  Asset-Backed Bonds, Series 2001B, 6.000%, 5/15/22 (Pre-refunded 5/15/12)       
16,380  Total South Carolina      18,336,592 
  Texas – 8.4%       
5,000  Brazos River Harbor Navigation District, Brazoria County, Texas, Environmental Facilities  5/12 at 101.00  BBB–  5,032,200 
  Revenue Bonds, Dow Chemical Company Project, Series 2002A-6, 6.250%, 5/15/33 (Mandatory       
  put 5/15/17) (Alternative Minimum Tax)       
1,000  Dallas Area Rapid Transit, Texas, Senior Lien Sales Tax Revenue Bonds, Series 2001, 5.000%,  12/11 at 100.00  AAA  1,083,220 
  12/01/31 (Pre-refunded 12/01/11) – AMBAC Insured       
360  Dallas-Fort Worth International Airport Public Facility Corporation, Texas, Airport Hotel  3/10 at 100.00  AAA  360,472 
  Revenue Bonds, Series 2001, 5.500%, 1/15/20 – FSA Insured       
2,300  Harris County Health Facilities Development Corporation, Texas, Thermal Utility Revenue Bonds,  11/13 at 100.00  AA  2,330,544 
  TECO Project, Series 2003, 5.000%, 11/15/30 – NPFG Insured       
1,550  Harris County-Houston Sports Authority, Texas, Junior Lien Revenue Bonds, Series 2001H,  No Opt. Call  A  358,422 
  0.000%, 11/15/30 – NPFG Insured       
3,470  Harris County-Houston Sports Authority, Texas, Senior Lien Revenue Refunding Bonds, Series  11/30 at 61.17  A  437,810 
  2001A, 0.000%, 11/15/38 – NPFG Insured       
2,805  Harris County-Houston Sports Authority, Texas, Third Lien Revenue Bonds, Series 2004-A3.,  11/24 at 52.47  A  408,212 
  0.000%, 11/15/35 – NPFG Insured       
45  Irving Independent School District, Dallas County, Texas, General Obligation Refunding Bonds,  2/12 at 100.00  AAA  45,855 
  Series 2002A, 5.000%, 2/15/31       
3,455  Irving Independent School District, Dallas County, Texas, General Obligation Refunding Bonds,  2/12 at 100.00  AAA  3,768,921 
  Series 2002A, 5.000%, 2/15/31 (Pre-refunded 2/15/12)       
1,780  Leander Independent School District, Williamson and Travis Counties, Texas, General Obligation  8/16 at 35.23  AAA  392,579 
  Bonds, Series 2007, 0.000%, 8/15/37       
2,000  North Texas Thruway Authority, First Tier System Revenue Refunding Bonds, Capital Appreciation  1/25 at 100.00  A2  1,504,740 
  Series 2008I, 0.000%, 1/01/43       
2,000  Richardson Hospital Authority, Texas, Revenue Bonds, Richardson Regional Medical Center,  12/13 at 100.00  Baa2  1,742,380 
  Series 2004, 6.000%, 12/01/34       
465  San Antonio, Texas, Water System Revenue Refunding Bonds, Series 1992, 6.000%, 5/15/16  5/12 at 100.00  Aa3 (4)  506,208 
  (Pre-refunded 5/15/12) – MBIA Insured       
1,750  Texas, General Obligation Bonds, Water Financial Assistance Program, Series 2003A, 5.125%,  8/13 at 100.00  AA+  1,657,285 
  8/01/42 (Alternative Minimum Tax)       
27,980  Total Texas      19,628,848 
  Utah – 0.4%       
775  Utah State Building Ownership Authority, Lease Revenue Bonds, State Facilities Master Lease  11/11 at 100.00  AA+  824,879 
  Program, Series 2001B, 5.250%, 5/15/24       
  Virginia – 0.6%       
1,500  Fairfax County Economic Development Authority, Virginia, Residential Care Facilities Mortgage  10/17 at 100.00  N/R  1,312,665 
  Revenue Bonds, Goodwin House, Inc., Series 2007A, 5.125%, 10/01/42       
  Washington – 6.9%       
250  Energy Northwest, Washington, Electric Revenue Refunding Bonds, Columbia Generating Station –  7/12 at 100.00  Aaa  273,865 
  Nuclear Project 2, Series 2002C, 5.500%, 7/01/17 – NPFG Insured       
2,470  Snohomish County Public Utility District 1, Washington, Generation System Revenue Bonds,  No Opt. Call  Aaa  2,613,853 
  Series 1989, 6.750%, 1/01/12 (ETM)       
9,750  Washington State Healthcare Facilities Authority, Revenue Bonds, Sisters of Providence Health  10/11 at 100.00  AA  10,097,880 
  System, Series 2001A, 5.125%, 10/01/17 – NPFG Insured       
2,105  Washington State Tobacco Settlement Authority, Tobacco Settlement Asset-Backed Revenue Bonds,  6/13 at 100.00  BBB  2,119,672 
  Series 2002, 6.500%, 6/01/26       
2,115  Washington State, Motor Vehicle Fuel Tax General Obligation Bonds, Series 2003F, 0.000%,  No Opt. Call  AA+  931,425 
  12/01/27 – NPFG Insured       
16,690  Total Washington      16,036,695 
  West Virginia – 0.5%       
760  Marshall County, West Virginia, Special Obligation Refunding Bonds, Series 1992, 6.500%,  No Opt. Call  AAA  777,670 
  5/15/10 (ETM)       
500  West Virginia Hospital Finance Authority, Revenue Bonds, United Hospital Center Inc. Project,  6/16 at 100.00  A+  477,600 
  Series 2006A, 4.500%, 6/01/26 – AMBAC Insured       
1,260  Total West Virginia      1,255,270 
  Wisconsin – 1.9%       
785  Badger Tobacco Asset Securitization Corporation, Wisconsin, Tobacco Settlement Asset-Backed  6/12 at 100.00  AAA  850,964 
  Bonds, Series 2002, 6.125%, 6/01/27 (Pre-refunded 6/01/12)       
1,000  Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Wheaton Franciscan  8/13 at 100.00  BBB+  1,005,140 
  Services Inc., Series 2003A, 5.500%, 8/15/17       
2,500  Wisconsin, General Obligation Refunding Bonds, Series 2003-3, 5.000%, 11/01/26  11/13 at 100.00  AA  2,594,200 
4,285  Total Wisconsin      4,450,304 
$   271,060  Total Municipal Bonds (cost $225,071,213)      229,278,855 
 
Shares  Description (1)      Value 
  Common Stocks – 0.0%       
  Airlines – 0.0%       
789  UAL Corporation, (5)      $ 10,186 
  Total Common Stocks (cost $0)      10,186 
  Total Long-Term Investments (cost $225,071,213) – 98.2%      229,289,041 
Principal         
Amount (000)  Description (1)      Value 
  Short-Term Investments – 0.1%       
$          326  State Street Bank Euro Dollar Time Deposit, 0.010%, 1/04/10      $        325,932 
  Total Short-Term Investments (cost $325,932)      325,932 
  Total Investments (cost $225,397,145) – 98.3%      229,614,973 
  Other Assets Less Liabilities – 1.7%      3,867,124 
  Net Assets – 100%      $ 233,482,097 



 


 


 


 


 

Fair Value Measurements

In determining the value of the Fund’s investments, various inputs are used. These inputs are summarized in the three broad levels listed below:

  Level 1 – Quoted prices in active markets for identical securities.

  Level 2 – Other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

  Level 3 – Significant unobservable inputs (including management’s assumptions in determining the fair value of investments).

The inputs or methodology 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 December 31, 2009:

  Level 1  Level 2  Level 3  Total 
Investments:         
Municipal Bonds  $         —  $229,278,855  $ —  $229,278,855 
Common Stocks  10,186  —  —  10,186 
Short-Term Investments  325,932  —  —  325,932 
Total  $336,118  $229,278,855  $ —  $229,614,973 

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.

At December 31, 2009, the cost of investments was $225,033,330.

Gross unrealized appreciation and gross unrealized depreciation of investments at December 31, 2009, were as follows:

Gross unrealized:   
  Appreciation  $ 15,753,509 
  Depreciation  (11,171,866)
Net unrealized appreciation (depreciation) of investments  $   4,581,643 

(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 higher of Standard & Poor’s Group (“Standard & Poor’s”) or Moody’s Investor Service, 
  Inc. (“Moody’s”) rating. Ratings below BBB by Standard & Poor’s or Baa by Moody’s are considered to 
  be below investment grade. 
(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. Such investments are normally considered to 
  be equivalent to AAA rated securities. 
(5)  On December 9, 2002, UAL Corporation (“UAL”), the holding company of United Air Lines, Inc. (“United”) 
  filed for federal bankruptcy protection. The Adviser determined that it was likely that United would not 
  remain current on their interest payment obligations with respect to the bonds previously held and thus 
  the Fund had stopped accruing interest on its UAL bonds. On February 1, 2006, UAL emerged from federal 
  bankruptcy with the acceptance of its reorganization plan by the bankruptcy court. Under the settlement 
  agreement established to meet UAL’s unsecured bond obligations, the bondholders, including the Fund, 
  received three distributions of UAL common stock over the subsequent months, and the bankruptcy court 
  dismissed all unsecured claims of bondholders, including those of the Fund. On May 5, 2006, the Fund 
  liquidated such UAL common stock holdings. On September 29, 2006 and May 30, 2007, the Fund received 
  additional distributions of 1,901 and 617 shares, respectively, of UAL common stock as a result of its 
  earlier ownership of the UAL bonds. The Fund liquidated 1,901 shares of such UAL common stock holdings 
  on November 15, 2006. The Fund received an additional distribution of 172 UAL common stock shares on 
  November 14, 2007. The remaining 789 shares of UAL common stock were still held by the Fund at 
  December 31, 2009. 
N/R  Not rated. 
(ETM)  Escrowed to maturity. 
(IF)  Inverse floating rate investment. 

 
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 Tax-Free Income Portfolio 
 
By (Signature and Title)     /s/ Kevin J. McCarthy                    
                                                   Kevin J. McCarthy
                                                   Vice President and Secretary
 
Date         March 1, 2010        
 
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         March 1, 2010        
 
By (Signature and Title)     /s/ Stephen D. Foy                              
                                                   Stephen D. Foy
                                                  Vice President and Controller (principal financial officer) 
 
Date        March 1, 2010