| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Municipal Obligations–164.83%(a) | ||||||
| Alabama–2.02% | ||||||
| Alabama (State of) Special Care Facilities Financing Authority (Ascension Health Senior Credit Group); Series 2016 B, Ref. RB | 5.00% | 11/15/2046 | $ 4,770 | $ 5,519,367 | ||
| Birmingham (City of), AL Airport Authority; Series 2010, RB (INS - AGM)(b) | 5.25% | 07/01/2030 | 1,650 | 1,656,072 | ||
| Birmingham (City of), AL Special Care Facilities Financing Authority (Methodist Home for the Aging); Series 2016, RB | 5.75% | 06/01/2045 | 225 | 216,077 | ||
| Birmingham (City of), AL Water Works Board; Series 2016 B, Ref. RB | 5.00% | 01/01/2043 | 1,235 | 1,465,933 | ||
| Huntsville (City of), AL Special Care Facilities Financing Authority (Redstone Village); Series 2007, RB (c) | 5.50% | 01/01/2043 | 1,725 | 1,131,807 | ||
| Lower Alabama Gas District (The); Series 2016 A, RB (d) | 5.00% | 09/01/2046 | 2,700 | 3,552,390 | ||
| Tuscaloosa (County of), AL Industrial Development Authority (Hunt Refining); Series 2019 A, Ref. IDR (e) | 5.25% | 05/01/2044 | 825 | 844,420 | ||
| 14,386,066 | ||||||
| Alaska–0.46% | ||||||
| Alaska (State of) Industrial Development & Export Authority (Providence Health Services); Series 2011 A, RB (d) | 5.50% | 10/01/2041 | 3,160 | 3,262,921 | ||
| Arizona–4.25% | ||||||
| Arizona (State of) Health Facilities Authority (Scottsdale Lincoln Hospital); Series 2014, Ref. RB | 5.00% | 12/01/2042 | 2,160 | 2,346,624 | ||
| Arizona (State of) Industrial Development Authority; Series 2019 A-2, RB | 3.63% | 05/20/2033 | 1,103 | 1,106,975 | ||
| Arizona (State of) Industrial Development Authority (Great Laked Senior Living Community); Series 2019 A, RB | 4.25% | 01/01/2040 | 1,500 | 1,324,515 | ||
| Arizona (State of) Industrial Development Authority (Leman Academy of Excellence); Series 2017 A, Ref. RB (e) | 5.25% | 07/01/2047 | 1,160 | 1,153,307 | ||
| Arizona (State of) Transportation Board; Series 2011 A, Ref. RB (d) | 5.25% | 07/01/2032 | 2,500 | 2,637,600 | ||
| City of Phoenix Civic Improvement Corp; Series 2020, RB (d) | 5.00% | 07/01/2049 | 3,015 | 3,527,550 | ||
| City of Phoenix Civic Improvement Corp.; Series 2020 A, RB | 5.00% | 07/01/2044 | 2,000 | 2,618,600 | ||
| Glendale (City of), AZ Industrial Development Authority (The Beatitudes Campus); | ||||||
| Series 2017, Ref. RB | 5.00% | 11/15/2029 | 1,105 | 1,062,303 | ||
| Series 2017, Ref. RB | 5.00% | 11/15/2045 | 890 | 723,018 | ||
| Maricopa (County of), AZ Industrial Development Authority (Legacy Traditional Schools); Series 2019, Ref. RB (e) | 5.00% | 07/01/2054 | 225 | 222,809 | ||
| Maricopa County Pollution Control Corp. (Southern California Education Co.); Series 2000 B, Ref. RB | 5.00% | 06/01/2035 | 1,170 | 1,172,878 | ||
| Phoenix (City of), AZ Industrial Development Authority (Career Success Schools); | ||||||
| Series 2009, RB | 7.00% | 01/01/2039 | 640 | 641,536 | ||
| Series 2009, RB | 7.13% | 01/01/2045 | 610 | 611,495 | ||
| Phoenix (City of), AZ Industrial Development Authority (Legacy Traditional Schools); Series 2014 A, RB (e) | 6.50% | 07/01/2034 | 500 | 549,375 | ||
| Phoenix (City of), AZ Industrial Development Authority (Rowan University); Series 2012, RB | 5.00% | 06/01/2042 | 2,170 | 2,243,650 | ||
| Phoenix Civic Improvement Corp.; | ||||||
| Series 2017 A, RB (f) | 5.00% | 07/01/2042 | 1,550 | 1,760,815 | ||
| Series 2017 A, RB (f) | 5.00% | 07/01/2047 | 2,475 | 2,794,102 | ||
| Pima (County of), AZ Industrial Development Authority (American Leadership Academy); Series 2019, Ref. RB (e) | 5.00% | 06/15/2052 | 360 | 321,635 | ||
| Pima (County of), AZ Industrial Development Authority (Grande Innovations Academy); Series 2018, RB (e) | 5.25% | 07/01/2048 | 1,190 | 1,118,540 | ||
| Salt Verde Financial Corp.; Series 2007, RB | 5.00% | 12/01/2037 | 800 | 1,044,368 | ||
| Yuma (City of), AZ Industrial Development Authority (Regional Medical Center); Series 2014 A, RB | 5.25% | 08/01/2032 | 1,060 | 1,185,377 | ||
| 30,167,072 | ||||||
| Arkansas–0.08% | ||||||
| Arkansas (State of) Development Finance Authority (Baptist Memorial Health); Series 2020, Ref. RB | 5.00% | 09/01/2039 | 500 | 569,575 | ||
| California–12.36% | ||||||
| Anaheim (City of), CA Public Financing Authority (Anaheim Public Improvements); Series 1997 C, RB (INS - AGM)(b)(g) | 0.00% | 09/01/2020 | 4,000 | 3,996,040 | ||
| Bay Area Toll Authority (San Francisco Bay Area); Series 2017 F-1, RB (d) | 5.00% | 04/01/2056 | 2,490 | 2,916,861 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| California–(continued) | ||||||
| Beverly Hills Unified School District (Election of 2008); Series 2009, GO Bonds (g) | 0.00% | 08/01/2028 | $ 800 | $ 727,432 | ||
| California (County of), CA Tobacco Securitization Agency (Alameda County Tobacco Asset Securitization Corp.); Series 2006 C, RB (g) | 0.00% | 06/01/2055 | 11,000 | 699,490 | ||
| California (State of); | ||||||
| Series 2012, GO Bonds | 5.25% | 04/01/2035 | 2,880 | 3,126,355 | ||
| Series 2012, GO Bonds | 5.00% | 04/01/2042 | 1,900 | 2,038,320 | ||
| Series 2012, Ref. GO Bonds | 5.00% | 02/01/2032 | 2,100 | 2,246,496 | ||
| Series 2013, Ref. GO Bonds | 5.25% | 09/01/2030 | 1,500 | 1,712,835 | ||
| California (State of) Community Housing Agency (Annadel Apartments); Series 2019 A, RB (e) | 5.00% | 04/01/2049 | 835 | 868,801 | ||
| California (State of) Health Facilities Financing Authority (Sutter Health); Series 2011 B, RB (h)(i) | 5.50% | 08/15/2020 | 1,000 | 1,010,860 | ||
| California (State of) Housing Finance Agency; Series 2019 2, Class A, Revenue Ctfs. | 4.00% | 03/20/2033 | 497 | 507,803 | ||
| California (State of) Municipal Finance Authority (CHF-Davis I, LLC - West Village Student Housing Project); Series 2018, RB | 5.00% | 05/15/2035 | 1,255 | 1,387,716 | ||
| California (State of) Municipal Finance Authority (Linxs APM); | ||||||
| Series 2018 A, RB (f) | 5.00% | 12/31/2038 | 1,490 | 1,636,303 | ||
| Series 2018 A, RB (f) | 5.00% | 12/31/2043 | 2,010 | 2,182,297 | ||
| California (State of) Pollution Control Finance Authority; | ||||||
| Series 2012, RB (e)(f) | 5.00% | 07/01/2027 | 1,375 | 1,439,680 | ||
| Series 2012, RB (e)(f) | 5.00% | 07/01/2030 | 1,600 | 1,668,320 | ||
| Series 2012, RB (e)(f) | 5.00% | 07/01/2037 | 3,535 | 3,642,570 | ||
| California (State of) Statewide Communities Development Authority (Loma Linda University Medical Center); | ||||||
| Series 2014, RB | 5.25% | 12/01/2044 | 855 | 879,248 | ||
| Series 2016 A, RB (e) | 5.00% | 12/01/2041 | 1,355 | 1,391,206 | ||
| Series 2016 A, RB (e) | 5.25% | 12/01/2056 | 1,005 | 1,021,241 | ||
| California State University; Series 2018 A, Ref. RB | 5.00% | 11/01/2048 | 2,070 | 2,574,128 | ||
| City of Long Beach CA Harbor Revenue; Series 2020-XM0865, Ctfs. (d) | 5.00% | 05/15/2044 | 2,005 | 2,484,235 | ||
| Daly City (City of), CA Housing Development Finance Agency (Franciscan Mobile Home Park Acquisition); Series 2007 C, Ref. RB | 6.50% | 12/15/2047 | 395 | 395,332 | ||
| Foothill-Eastern Transportation Corridor Agency; Series 2015, Ref. RB (INS - AGM)(b)(g) | 0.00% | 01/15/2034 | 4,125 | 2,777,032 | ||
| Golden State Tobacco Securitization Corp.; | ||||||
| Series 2013 A, RB | 5.00% | 06/01/2030 | 2,875 | 3,189,525 | ||
| Series 2015 A, Ref. RB | 5.00% | 06/01/2040 | 1,000 | 1,147,640 | ||
| Series 2018 A-1, Ref. RB | 5.00% | 06/01/2047 | 1,130 | 1,130,915 | ||
| Los Angeles Department of Water; Series 2012 B, RB (d) | 5.00% | 07/01/2043 | 3,500 | 3,783,150 | ||
| M-S-R Energy Authority; | ||||||
| Series 2009 A, RB | 6.50% | 11/01/2039 | 2,265 | 3,396,911 | ||
| Series 2009 B, RB | 7.00% | 11/01/2034 | 585 | 858,137 | ||
| Mt. San Antonio Community College District (Election of 2008); Series 2013 A, GO Bonds (j) | 6.25% | 08/01/2043 | 2,010 | 2,134,178 | ||
| Oroville (City of), CA (Oroville Hospital); Series 2019, RB | 5.25% | 04/01/2049 | 620 | 650,473 | ||
| Sacramento (County of), CA; Series 2010, RB | 5.00% | 07/01/2040 | 2,300 | 2,306,555 | ||
| San Buenaventura (City of), CA (Community Memorial Health System); Series 2011, RB | 7.50% | 12/01/2041 | 2,200 | 2,238,192 | ||
| San Diego (City of), CA Community College District (Election of 2006); Series 2011, GO Bonds (d) | 5.00% | 08/01/2036 | 4,110 | 4,343,695 | ||
| San Francisco (City & County of), CA Airport Commission (San Francisco International Airport); | ||||||
| Series 2011 F, Ref. RB (f) | 5.00% | 05/01/2025 | 775 | 801,102 | ||
| Series 2011 F, Ref. RB (f) | 5.00% | 05/01/2026 | 1,550 | 1,601,630 | ||
| Series 2019 A, Ref. RB (f) | 5.00% | 05/01/2036 | 1,170 | 1,395,026 | ||
| Series 2019 A, Ref. RB (f) | 5.00% | 05/01/2039 | 2,360 | 2,787,113 | ||
| San Francisco (City & County of), CA Public Utilities Commission (Water System Improvement Program); Subseries 2011 A, RB (d) | 5.00% | 11/01/2036 | 3,360 | 3,589,589 | ||
| Santa Margarita Water District (Community Facilities District No. 2013-1); Series 2013, RB | 5.50% | 09/01/2032 | 660 | 716,107 | ||
| Silicon Valley Tobacco Securitization Authority (Santa Clara); Series 2007 A, RB (g) | 0.00% | 06/01/2041 | 3,485 | 1,075,122 | ||
| State of California; Series 2020-XX1123, Ctfs. (d)(k) | 4.00% | 03/01/2046 | 3,015 | 3,550,615 | ||
| University of California; Series 2018 AZ, Ref. RB (d) | 4.00% | 05/15/2048 | 3,300 | 3,779,919 | ||
| 87,806,195 | ||||||
| Colorado–3.58% | ||||||
| Arkansas River Power Authority; Series 2006, RB (h) | 5.88% | 10/01/2026 | 1,235 | 1,486,075 | ||
| Colorado (State of) Board of Governors; Series 2012 A, RB (d) | 5.00% | 03/01/2041 | 3,850 | 4,174,286 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Colorado–(continued) | ||||||
| Colorado (State of) Health Facilities Authority (Adventist Health System/Sunbelt Obligated Group); Series 2018 A, RB | 5.00% | 11/15/2048 | $ 1,170 | $ 1,354,146 | ||
| Colorado (State of) Health Facilities Authority (CommonSpirit Health); Series 2019 A-2, Ref. RB | 4.00% | 08/01/2049 | 1,675 | 1,705,602 | ||
| Colorado (State of) Health Facilities Authority (Evangelical Lutheran Good Samaritan Society (The)); Series 2017, Ref. RB (h)(i) | 5.00% | 06/01/2027 | 585 | 759,260 | ||
| Colorado (State of) Health Facilities Authority (Volunteers of America Care); | ||||||
| Series 2007 A, RB | 5.25% | 07/01/2027 | 295 | 266,235 | ||
| Series 2007 A, RB | 5.30% | 07/01/2037 | 355 | 278,160 | ||
| Colorado (State of) High Performance Transportation Enterprise (C-470 Express Lanes); Series 2017, RB | 5.00% | 12/31/2047 | 920 | 914,508 | ||
| Colorado (State of) Regional Transportation District (Denver Transit Partners Eagle P3); | ||||||
| Series 2010, RB | 6.50% | 01/15/2030 | 1,400 | 1,403,710 | ||
| Series 2010, RB | 6.00% | 01/15/2034 | 1,100 | 1,102,266 | ||
| Colorado (State of) Science and Technology Park Metropolitan District No. 1; Series 2018, Ref. RB | 5.00% | 12/01/2033 | 500 | 490,755 | ||
| Colorado Health Facilities Authority; Series 2020-XX1130, Ctfs. (d)(k) | 5.00% | 08/01/2044 | 1,260 | 1,411,452 | ||
| Denver (City & County of), CO; | ||||||
| Series 2012 B, RB | 5.00% | 11/15/2037 | 1,850 | 1,983,977 | ||
| Series 2018 A, Ref. RB (d)(f) | 5.25% | 12/01/2048 | 5,260 | 6,184,655 | ||
| Series 2018 A-2, RB (g) | 0.00% | 08/01/2033 | 1,765 | 1,228,405 | ||
| Neu Towne Metropolitan District; Series 2018 A, Ref. GO Bonds | 5.38% | 12/01/2046 | 705 | 672,020 | ||
| 25,415,512 | ||||||
| Connecticut–0.46% | ||||||
| Connecticut (State of) (Bradley International Airport); Series 2000 A, RB (INS - ACA)(b)(f) | 6.60% | 07/01/2024 | 2,015 | 2,020,380 | ||
| Connecticut (State of) Development Authority (Aquarion Water Co.); Series 2011, RB (f) | 5.50% | 04/01/2021 | 1,200 | 1,245,048 | ||
| 3,265,428 | ||||||
| District of Columbia–3.07% | ||||||
| District of Columbia; Series 2014 C, GO Bonds (d) | 5.00% | 06/01/2035 | 6,890 | 7,979,585 | ||
| District of Columbia (Provident Group - Howard Properties LLC); Series 2013, RB | 5.00% | 10/01/2045 | 2,125 | 1,918,832 | ||
| District of Columbia Water & Sewer Authority; Series 2013 A, RB (d) | 5.00% | 10/01/2044 | 3,000 | 3,470,160 | ||
| Metropolitan Washington Airports Authority (Dulles Metrorail and Capital Improvement); | ||||||
| Series 2014 A, Ref. RB | 5.00% | 10/01/2053 | 6,550 | 6,725,933 | ||
| Series 2019 B, Ref. RB | 4.00% | 10/01/2049 | 1,675 | 1,699,723 | ||
| 21,794,233 | ||||||
| Florida–7.63% | ||||||
| Alachua (County of), FL Health Facilities Authority (Shands Teaching Hospital & Clinics); Series 2019, RB | 4.00% | 12/01/2049 | 505 | 527,437 | ||
| Alachua (County of), FL Health Facilities Authority (Terraces at Bonita Springs); Series 2011 A, RB | 8.13% | 11/15/2041 | 1,000 | 687,790 | ||
| Broward (County of), FL; | ||||||
| Series 2012 A, RB (h)(i) | 5.00% | 10/01/2022 | 2,270 | 2,524,898 | ||
| Series 2013 C, RB (h)(i) | 5.25% | 10/01/2023 | 2,450 | 2,854,250 | ||
| Series 2015 A, RB (f) | 5.00% | 10/01/2045 | 1,395 | 1,539,829 | ||
| Series 2017, RB (d)(f)(k) | 5.00% | 10/01/2047 | 4,015 | 4,547,791 | ||
| Series 2019 B, RB (f) | 4.00% | 09/01/2044 | 835 | 881,927 | ||
| Cape Coral (City of), FL Health Facilities Authority (Gulf Care, Inc.); Series 2015, Ref. RB (e) | 6.00% | 07/01/2045 | 250 | 198,920 | ||
| Central Florida Expressway Authority; Series 2020-XX1136, Ctfs. (d)(k) | 5.00% | 07/01/2049 | 2,385 | 2,819,762 | ||
| Collier (County of), FL Industrial Development Authority (The Arlington of Naples); Series 2014 A, RB (Acquired 12/16/2013; Cost $1,270,077) (c)(e) | 7.75% | 05/15/2035 | 1,300 | 975,000 | ||
| Davie (Town of), FL (Nova Southeastern University); Series 2013 A, RB | 6.00% | 04/01/2042 | 1,400 | 1,518,776 | ||
| Escambia (County of), FL Health Facilities Authority (Florida Health Care Facility Loan Veterans Health Administration Program); Series 2000, RB (h) | 5.95% | 07/01/2020 | 35 | 35,161 | ||
| Florida (State of) North Broward Hospital District; Series 2017 B, Ref. RB | 5.00% | 01/01/2048 | 3,015 | 3,348,580 | ||
| Florida (State of) Ports Financing Commission (State Transportation Trust Fund); Series 2011 B, Ref. RB (f) | 5.13% | 06/01/2027 | 1,650 | 1,726,329 | ||
| Greater Orlando Aviation Authority; Series 2019 A, RB (f) | 4.00% | 10/01/2039 | 2,500 | 2,739,800 | ||
| Hillsborough (County of), FL Aviation Authority (Tampa International Airport); Series 2018 E, RB (f) | 5.00% | 10/01/2048 | 2,080 | 2,337,525 | ||
| JEA Electric System Revenue; Series 2012 3B, RB | 5.00% | 10/01/2039 | 145 | 153,780 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Florida–(continued) | ||||||
| Miami Beach (City of), FL Health Facilities Authority (Mount Sinai Medical Center); Series 2014, Ref. RB | 5.00% | 11/15/2039 | $ 935 | $ 1,008,902 | ||
| Miami-Dade (County of), FL; | ||||||
| Series 2012 A, Ref. RB (f)(h)(i) | 5.00% | 10/01/2022 | 1,000 | 1,103,640 | ||
| Series 2012 B, Ref. RB | 5.00% | 10/01/2032 | 1,150 | 1,270,221 | ||
| Series 2012 B, Ref. RB (INS - AGM)(b) | 5.00% | 10/01/2035 | 1,950 | 2,149,056 | ||
| Series 2016 A, Ref. RB | 5.00% | 10/01/2041 | 2,795 | 3,171,570 | ||
| Miami-Dade (County of), FL Educational Facilities Authority (University of Miami); Series 2018 A, RB (d) | 5.00% | 04/01/2053 | 3,865 | 4,342,250 | ||
| Miami-Dade (County of), FL Expressway Authority; Series 2010 A, Ref. RB | 5.00% | 07/01/2040 | 1,250 | 1,253,300 | ||
| Miami-Dade (County of), FL Health Facilities Authority (Miami Children’s Hospital); | ||||||
| Series 2010, Ref. RB (h)(i) | 6.13% | 08/01/2020 | 470 | 474,442 | ||
| Series 2010, Ref. RB | 6.13% | 08/01/2042 | 170 | 170,984 | ||
| Miami-Dade (County of), FL Industrial Development Authority (Waste Management, Inc.); Series 2018 B, RB (SIFMA Municipal Swap Index + 0.80%)(f)(i)(l) | 0.94% | 11/01/2021 | 585 | 585,614 | ||
| Orlando (City of), FL Greater Orlando Aviation Authority; Series 2017 A, RB (f) | 5.00% | 10/01/2047 | 1,315 | 1,504,399 | ||
| Osceola (County of), FL; | ||||||
| Series 2020 A-2, Ref. RB (g) | 0.00% | 10/01/2044 | 1,000 | 372,520 | ||
| Series 2020 A-2, Ref. RB (g) | 0.00% | 10/01/2052 | 450 | 118,125 | ||
| Series 2020 A-2, Ref. RB (g) | 0.00% | 10/01/2053 | 445 | 111,717 | ||
| Series 2020 A-2, Ref. RB (g) | 0.00% | 10/01/2054 | 385 | 92,415 | ||
| Overoaks Community Development District; Series 2010 A-2, RB (j) | 6.13% | 05/01/2035 | 90 | 90,984 | ||
| Palm Beach (County of), FL Solid Waste Authority; Series 2016, RB (d) | 5.00% | 10/01/2031 | 2,565 | 2,722,440 | ||
| Putnam (County of), FL Development Authority (Seminole Electric Cooperative); Series 2018 B, Ref. PCR | 5.00% | 03/15/2042 | 840 | 1,017,744 | ||
| Reunion East Community Development District; | ||||||
| Series 2005, RB (c)(m) | 5.80% | 05/01/2036 | 235 | 2 | ||
| Series 2015-2, RB | 6.60% | 05/01/2036 | 205 | 199,098 | ||
| Sterling Hill Community Development District; Series 2003 A, RB (m)(n) | 6.20% | 05/01/2035 | 735 | 463,290 | ||
| Sumter (County of), FL Industrial Development Authority (Central Florida Health Alliance); Series 2014 A, RB | 5.25% | 07/01/2044 | 1,000 | 1,081,630 | ||
| Tallahassee (City of), FL (Tallahassee Memorial Health Care, Inc.); Series 2016, RB | 5.00% | 12/01/2055 | 1,350 | 1,453,586 | ||
| 54,175,484 | ||||||
| Georgia–3.17% | ||||||
| Atlanta (City of), GA; Series 2015, Ref. RB (d) | 5.00% | 11/01/2040 | 8,290 | 9,651,964 | ||
| Augusta (City of), GA Development Authority; Series 2018, RB | 4.00% | 07/01/2039 | 2,860 | 3,013,582 | ||
| Brookhaven Development Authority; | ||||||
| Series 2020, RB (d)(k) | 4.00% | 07/01/2044 | 1,130 | 1,268,301 | ||
| Series 2020, RB (d)(k) | 4.00% | 07/01/2049 | 1,680 | 1,870,478 | ||
| DeKalb (County of), GA Hospital Authority (DeKalb Medical Center, Inc.); Series 2010, RAC (h)(i) | 6.00% | 09/01/2020 | 1,000 | 1,014,450 | ||
| Fulton (County of), GA Development Authority (Georgia Tech Athletic Association); Series 2012, Ref. RB | 5.00% | 10/01/2042 | 1,150 | 1,237,331 | ||
| Fulton (County of), GA Development Authority (Wellstar Health System, Inc.); Series 2017, RB | 5.00% | 04/01/2042 | 1,000 | 1,114,380 | ||
| Glynn-Brunswick Memorial Hospital Authority (Southeast Georgia Health System); Series 2017, RAC | 5.00% | 08/01/2043 | 3,000 | 3,352,380 | ||
| 22,522,866 | ||||||
| Guam–0.52% | ||||||
| Guam (Territory of); | ||||||
| Series 2011 A, RB | 5.25% | 01/01/2036 | 625 | 637,300 | ||
| Series 2011 A, RB | 5.13% | 01/01/2042 | 780 | 791,622 | ||
| Guam (Territory of) Power Authority; Series 2010 A, RB (h)(i) | 5.50% | 10/01/2020 | 835 | 849,529 | ||
| Guam (Territory of) Waterworks Authority; Series 2010, RB (h)(i) | 5.63% | 07/01/2020 | 1,400 | 1,406,076 | ||
| 3,684,527 | ||||||
| Hawaii–1.33% | ||||||
| Hawaii (State of); | ||||||
| Series 2010 A, RB | 5.00% | 07/01/2039 | 2,050 | 2,055,535 | ||
| Series 2015 A, RB (f) | 5.00% | 07/01/2045 | 1,695 | 1,889,789 | ||
| Series 2018 A, RB (f) | 5.00% | 07/01/2043 | 1,550 | 1,798,481 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Hawaii–(continued) | ||||||
| Hawaii (State of) Department of Budget & Finance (Hawaii Pacific Health Obligated Group); | ||||||
| Series 2010 B, RB (h)(i) | 5.75% | 07/01/2020 | $ 1,000 | $ 1,004,470 | ||
| Series 2013 A, Ref. RB | 5.50% | 07/01/2043 | 2,500 | 2,700,775 | ||
| 9,449,050 | ||||||
| Idaho–0.24% | ||||||
| Idaho (State of) Health Facilities Authority (Valley Vista Care Corp.); Series 2017 A, Ref. RB | 5.25% | 11/15/2047 | 865 | 708,426 | ||
| Regents of the University of Idaho; Series 2011, Ref. RB (i) | 5.25% | 04/01/2021 | 965 | 999,190 | ||
| 1,707,616 | ||||||
| Illinois–19.34% | ||||||
| Bartlett (Village of), IL (Quarry Redevelopment); Series 2007, Ref. RB | 5.60% | 01/01/2023 | 565 | 565,119 | ||
| Bolingbrook (Village of), IL; Series 2005, RB (j) | 6.25% | 01/01/2024 | 1,100 | 1,021,939 | ||
| Chicago (City of), IL; | ||||||
| Series 2002 B, GO Bonds | 5.50% | 01/01/2037 | 1,050 | 1,077,373 | ||
| Series 2005 D, Ref. GO Bonds | 5.50% | 01/01/2040 | 1,190 | 1,215,383 | ||
| Series 2007 E, Ref. GO Bonds | 5.50% | 01/01/2042 | 340 | 346,287 | ||
| Series 2011 A, RB (h)(i) | 5.25% | 01/01/2022 | 1,905 | 2,054,523 | ||
| Series 2011, COP | 7.13% | 05/01/2021 | 347 | 346,930 | ||
| Series 2012 A, GO Bonds | 5.00% | 01/01/2033 | 1,675 | 1,675,502 | ||
| Series 2012 A, GO Bonds (INS - BAM)(b) | 5.00% | 01/01/2033 | 1,290 | 1,354,771 | ||
| Series 2012, RB | 5.00% | 01/01/2042 | 3,350 | 3,483,229 | ||
| Series 2014, RB | 5.00% | 11/01/2044 | 875 | 924,297 | ||
| Series 2014, Ref. RB (INS - AGM)(b) | 5.00% | 01/01/2032 | 1,175 | 1,297,541 | ||
| Series 2015 A, GO Bonds | 5.50% | 01/01/2033 | 3,395 | 3,516,032 | ||
| Series 2017 A, Ref. GO Bonds | 6.00% | 01/01/2038 | 2,025 | 2,172,440 | ||
| Series 2017-2, Ref. RB (INS - AGM)(b) | 5.00% | 11/01/2038 | 1,000 | 1,146,190 | ||
| Chicago (City of), IL (Diversey/Narragansett); Series 2006, COP (m) | 7.46% | 02/15/2026 | 551 | 385,646 | ||
| Chicago (City of), IL (Midway Airport); | ||||||
| Series 2013 A, Ref. RB (f) | 5.50% | 01/01/2031 | 2,650 | 2,857,839 | ||
| Series 2014 A, Ref. RB (f) | 5.00% | 01/01/2041 | 1,250 | 1,329,537 | ||
| Chicago (City of), IL (O’Hare International Airport); | ||||||
| Series 2012 B, Ref. RB (f) | 5.00% | 01/01/2030 | 4,500 | 4,705,425 | ||
| Series 2013, RB | 5.75% | 01/01/2038 | 2,450 | 2,589,846 | ||
| Series 2015 C, RB (f) | 5.00% | 01/01/2046 | 850 | 921,000 | ||
| Series 2015 D, RB | 5.00% | 01/01/2046 | 595 | 651,900 | ||
| Series 2016 C, Ref. RB | 5.00% | 01/01/2037 | 1,685 | 1,885,987 | ||
| Series 2017 D, RB | 5.25% | 01/01/2042 | 1,355 | 1,547,166 | ||
| Chicago (City of), IL Board of Education; | ||||||
| Series 2017 H, GO Bonds | 5.00% | 12/01/2036 | 1,705 | 1,690,797 | ||
| Series 2018 A, Ref. GO Bonds | 5.00% | 12/01/2035 | 750 | 744,818 | ||
| Series 2018 A, Ref. GO Bonds (INS - AGM)(b) | 5.00% | 12/01/2035 | 650 | 739,752 | ||
| Series 2018 C, Ref. GO Bonds | 5.00% | 12/01/2022 | 1,005 | 1,027,231 | ||
| Chicago (City of), IL Metropolitan Water Reclamation District (Green Bonds); Series 2016 E, GO Bonds | 5.00% | 12/01/2045 | 1,755 | 2,006,527 | ||
| Chicago (City of), IL Transit Authority; | ||||||
| Series 2011, RB (d)(k) | 5.25% | 12/01/2036 | 3,795 | 3,954,466 | ||
| Series 2014, RB | 5.00% | 12/01/2044 | 3,735 | 4,013,743 | ||
| Chicago Park District; | ||||||
| Series 2020 D, GO Bonds (INS - BAM)(b) | 4.00% | 01/01/2036 | 1,000 | 1,079,140 | ||
| Series 2020 D, GO Bonds (INS - BAM)(b) | 4.00% | 01/01/2037 | 1,000 | 1,074,620 | ||
| Gilberts (Village of), IL Special Service Area No. 24 (The Conservancy); Series 2014 A, RB | 5.38% | 03/01/2034 | 552 | 491,819 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Illinois–(continued) | ||||||
| Illinois (State of); | ||||||
| Series 2013, GO Bonds (INS - BAM)(b) | 5.50% | 07/01/2038 | $ 2,450 | $ 2,587,175 | ||
| Series 2014, GO Bonds | 5.25% | 02/01/2033 | 1,250 | 1,270,712 | ||
| Series 2014, GO Bonds | 5.00% | 05/01/2035 | 450 | 452,363 | ||
| Series 2014, GO Bonds | 5.00% | 05/01/2036 | 1,210 | 1,214,211 | ||
| Series 2016, GO Bonds | 5.00% | 11/01/2036 | 1,120 | 1,126,048 | ||
| Series 2017 C, GO Bonds | 5.00% | 11/01/2029 | 265 | 268,262 | ||
| Series 2017 D, GO Bonds | 5.00% | 11/01/2023 | 1,675 | 1,710,192 | ||
| Series 2017 D, GO Bonds | 5.00% | 11/01/2024 | 70 | 71,385 | ||
| Series 2017 D, GO Bonds | 5.00% | 11/01/2026 | 1,115 | 1,136,386 | ||
| Series 2018 A, GO Bonds | 6.00% | 05/01/2027 | 770 | 817,278 | ||
| Series 2018 A, GO Bonds | 5.00% | 05/01/2030 | 1,225 | 1,240,925 | ||
| Series 2018 A, Ref. GO Bonds | 5.00% | 10/01/2021 | 2,080 | 2,106,312 | ||
| Series 2018 A, Ref. GO Bonds | 5.00% | 10/01/2022 | 585 | 594,734 | ||
| Series 2020, GO Bonds | 5.50% | 05/01/2039 | 1,385 | 1,455,136 | ||
| Illinois (State of) Finance Authority (Art Institute of Chicago); Series 2012, RB (h)(i) | 5.00% | 03/01/2022 | 1,000 | 1,083,305 | ||
| Illinois (State of) Finance Authority (Centegra Health System); Series 2014 A, RB | 5.00% | 09/01/2042 | 1,430 | 1,589,717 | ||
| Illinois (State of) Finance Authority (CITGO Petroleum Corp.); Series 2002, RB (f) | 8.00% | 06/01/2032 | 360 | 359,953 | ||
| Illinois (State of) Finance Authority (Loyola University of Chicago); Series 2012 B, RB | 5.00% | 07/01/2042 | 1,000 | 1,082,200 | ||
| Illinois (State of) Finance Authority (Lutheran Communities Obligated Group); | ||||||
| Series 2019 A, Ref. RB | 5.00% | 11/01/2035 | 605 | 569,608 | ||
| Series 2019 A, Ref. RB | 5.00% | 11/01/2040 | 60 | 54,364 | ||
| Series 2019 A, Ref. RB | 5.00% | 11/01/2049 | 550 | 478,495 | ||
| Illinois (State of) Finance Authority (OSF Healthcare System); Series 2015 A, Ref. RB | 5.00% | 11/15/2045 | 2,375 | 2,648,600 | ||
| Illinois (State of) Finance Authority (Park Place of Elmhurst); | ||||||
| Series 2016 B, RB (c) | 5.63% | 05/15/2020 | 986 | 640,976 | ||
| Series 2016, RB (c) | 2.00% | 05/15/2055 | 230 | 2,303 | ||
| Illinois (State of) Finance Authority (Roosevelt University); Series 2007, RB | 5.50% | 04/01/2037 | 1,000 | 1,000,290 | ||
| Illinois (State of) Finance Authority (Rush University Medical Center); Series 2015 A, Ref. RB | 5.00% | 11/15/2038 | 2,490 | 2,740,021 | ||
| Illinois (State of) Finance Authority (The University of Chicago Medical Center); Series 2011 C, RB (d) | 5.50% | 08/15/2041 | 2,370 | 2,456,434 | ||
| Illinois (State of) Finance Authority (University of Chicago); Series 2013 A, RB (d) | 5.25% | 10/01/2052 | 3,630 | 3,988,317 | ||
| Illinois (State of) Metropolitan Pier & Exposition Authority; Series 2002, RB (INS - AGM)(b)(g) | 0.00% | 12/15/2029 | 2,750 | 2,014,980 | ||
| Illinois (State of) Metropolitan Pier & Exposition Authority (McCormick Place Expansion); | ||||||
| Series 2010, RB (h)(i) | 5.50% | 06/15/2020 | 550 | 550,985 | ||
| Series 2010, RB | 5.50% | 06/15/2050 | 1,715 | 1,717,881 | ||
| Series 2015 A, RB | 5.50% | 06/15/2053 | 2,200 | 2,225,872 | ||
| Illinois (State of) Sports Facilities Authority; | ||||||
| Series 2014, Ref. RB (INS - AGM)(b) | 5.25% | 06/15/2031 | 1,205 | 1,315,860 | ||
| Series 2014, Ref. RB (INS - AGM)(b) | 5.25% | 06/15/2032 | 1,100 | 1,190,277 | ||
| Illinois (State of) Toll Highway Authority; | ||||||
| Series 2013 A, RB (d) | 5.00% | 01/01/2038 | 3,875 | 4,182,288 | ||
| Series 2015 A, RB (d) | 5.00% | 01/01/2040 | 11,210 | 12,942,730 | ||
| Metropolitan Water Reclamation District of Greater Chicago; Series 2007 B, Ref. GO Bonds | 5.25% | 12/01/2035 | 3,155 | 4,522,756 | ||
| Peoria (County of), IL; Series 2011, GO Bonds (d) | 5.00% | 12/15/2041 | 3,075 | 3,147,970 | ||
| Railsplitter Tobacco Settlement Authority; Series 2010, RB (h)(i) | 5.50% | 06/01/2021 | 3,800 | 4,000,526 | ||
| Regional Transportation Authority; | ||||||
| Series 2002 A, RB (INS - NATL)(b) | 6.00% | 07/01/2029 | 1,155 | 1,558,834 | ||
| Series 2018 B, RB | 5.00% | 06/01/2040 | 2,315 | 2,765,476 | ||
| Sales Tax Securitization Corp.; Series 2018 A, Ref. RB (d) | 5.00% | 01/01/2048 | 4,195 | 4,582,744 | ||
| 137,359,696 | ||||||
| Indiana–2.97% | ||||||
| Indiana (State of) Finance Authority (CWA Authority); Series 2011 B, RB | 5.25% | 10/01/2031 | 2,320 | 2,470,730 | ||
| Indiana (State of) Finance Authority (Ohio River Bridges East End Crossing); | ||||||
| Series 2013 A, RB (f) | 5.00% | 07/01/2035 | 500 | 526,790 | ||
| Series 2013 A, RB (f) | 5.00% | 07/01/2048 | 575 | 598,937 | ||
| Series 2013, RB (f) | 5.00% | 07/01/2040 | 3,850 | 4,033,222 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Indiana–(continued) | ||||||
| Indiana (State of) Finance Authority (Ohio Valley Electric Corp.); | ||||||
| Series 2012 A, RB | 5.00% | 06/01/2032 | $ 610 | $ 622,273 | ||
| Series 2012 A, RB | 5.00% | 06/01/2039 | 2,670 | 2,684,365 | ||
| Indiana (State of) Municipal Power Agency; | ||||||
| Series 2013 A, RB (h)(i) | 5.25% | 07/01/2023 | 1,250 | 1,438,750 | ||
| Series 2016 A, Ref. RB | 5.00% | 01/01/2042 | 1,235 | 1,453,138 | ||
| Indianapolis Local Public Improvement Bond Bank; | ||||||
| Series 2011 K, RB | 5.00% | 06/01/2027 | 2,000 | 2,091,680 | ||
| Series 2013 F, RB (d) | 5.00% | 02/01/2030 | 3,240 | 3,599,834 | ||
| Valparaiso (City of), IN (Pratt Paper, LLC); Series 2013, RB (f) | 6.75% | 01/01/2034 | 1,500 | 1,594,380 | ||
| 21,114,099 | ||||||
| Iowa–1.50% | ||||||
| Iowa (State of) Finance Authority (Iowa Fertilizer Co.); | ||||||
| Series 2013, RB | 5.25% | 12/01/2025 | 1,295 | 1,309,401 | ||
| Series 2013, RB (e) | 5.88% | 12/01/2027 | 1,090 | 1,126,253 | ||
| Series 2013, Ref. RB (i) | 5.25% | 12/01/2037 | 1,265 | 1,272,008 | ||
| Series 2019, Ref. RB | 3.13% | 12/01/2022 | 485 | 480,344 | ||
| Iowa (State of) Finance Authority (Lifespace Communities, Inc.); Series 2016, RB | 5.00% | 05/15/2041 | 895 | 863,442 | ||
| Iowa (State of) Tobacco Settlement Authority; | ||||||
| Series 2005 B, RB (j) | 5.60% | 06/01/2034 | 280 | 283,696 | ||
| Series 2005 C, RB | 5.50% | 06/01/2042 | 1,965 | 1,990,938 | ||
| Series 2005 C, RB | 5.63% | 06/01/2046 | 1,370 | 1,388,084 | ||
| Series 2005 E, RB (g) | 0.00% | 06/01/2046 | 12,665 | 1,929,640 | ||
| 10,643,806 | ||||||
| Kansas–0.41% | ||||||
| Kansas (State of) Municipal Energy Agency (Jameson Energy Center); Series 2013, RB | 5.75% | 07/01/2038 | 1,575 | 1,794,209 | ||
| Wyandotte (County of) & Kansas City (City of), KS Unified Government; Series 2014 A, Ref. RB | 5.00% | 09/01/2044 | 1,000 | 1,132,900 | ||
| 2,927,109 | ||||||
| Kentucky–2.75% | ||||||
| Kentucky (Commonwealth of) Economic Development Finance Authority (Catholic Health Initiatives); Series 2011 B, RB (SIFMA Municipal Swap Index + 1.40%)(i)(l) | 1.54% | 02/01/2025 | 710 | 692,520 | ||
| Kentucky (State of) Economic Development Finance Authority (Louisville Arena Authority, Inc.); Series 2017 A, Ref. RB (INS - AGM)(b) | 5.00% | 12/01/2047 | 1,115 | 1,165,409 | ||
| Kentucky (State of) Economic Development Finance Authority (Next Generation Kentucky Information Highway); | ||||||
| Series 2015 A, RB | 5.00% | 07/01/2040 | 1,985 | 2,053,284 | ||
| Series 2015 A, RB | 5.00% | 01/01/2045 | 335 | 343,063 | ||
| Kentucky (State of) Economic Development Finance Authority (Owensboro Health, Inc.); | ||||||
| Series 2017 A, Ref. RB | 5.25% | 06/01/2041 | 1,265 | 1,347,807 | ||
| Series 2017 A, Ref. RB | 5.00% | 06/01/2045 | 1,015 | 1,053,367 | ||
| Kentucky (State of) Economic Development Finance Authority (Owensboro Medical Health System, Inc.); | ||||||
| Series 2010 A, RB (h)(i) | 6.38% | 06/01/2020 | 1,225 | 1,225,000 | ||
| Series 2010 A, RB (h)(i) | 6.50% | 06/01/2020 | 3,100 | 3,100,000 | ||
| Kentucky (State of) Public Energy Authority; Series 2019 C, RB (i) | 4.00% | 02/01/2028 | 1,495 | 1,662,590 | ||
| Kentucky (State of) Public Transportation Infrastructure Authority (Downtown Crossing); Series 2013 A, RB | 5.75% | 07/01/2049 | 1,000 | 1,034,380 | ||
| Kentucky Bond Development Corp; Series 2020, RB (INS - BAM)(b)(d)(k) | 5.00% | 09/01/2044 | 3,840 | 4,767,245 | ||
| Louisville (City of) & Jefferson (County of), KY Metropolitan Government (Norton Healthcare, Inc.); Series 2013 A, RB | 5.50% | 10/01/2033 | 1,000 | 1,100,510 | ||
| 19,545,175 | ||||||
| Louisiana–1.31% | ||||||
| Jefferson Sales Tax District; Series 2019 B, RB (INS - AGM)(b) | 4.00% | 12/01/2039 | 1,000 | 1,161,210 | ||
| Louisiana (State of) Local Government Environmental Facilities & Community Development Authority (St. James Parish Gomesa); Series 2019, RB (e) | 3.90% | 11/01/2044 | 955 | 790,902 | ||
| Louisiana (State of) Public Facilities Authority (Provident Group-Flagship Properties LLC- Louisiana State University Nicholson Gateway); Series 2016, RB | 5.00% | 07/01/2051 | 1,140 | 1,225,477 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Louisiana–(continued) | ||||||
| New Orleans (City of), LA; Series 2014, Ref. RB | 5.00% | 06/01/2044 | $ 755 | $ 853,580 | ||
| New Orleans (City of), LA Aviation Board (Parking Facilities Corp. Consolitdated Garage System); Series 2018 A, RB (INS - AGM)(b) | 5.00% | 10/01/2043 | 445 | 527,797 | ||
| Tobacco Settlement Financing Corp.; | ||||||
| Series 2013 A, Ref. RB | 5.50% | 05/15/2030 | 685 | 685,966 | ||
| Series 2013 A, Ref. RB | 5.25% | 05/15/2031 | 860 | 881,380 | ||
| Series 2013 A, Ref. RB | 5.25% | 05/15/2032 | 1,635 | 1,711,862 | ||
| Series 2013 A, Ref. RB | 5.25% | 05/15/2033 | 1,375 | 1,438,566 | ||
| 9,276,740 | ||||||
| Maryland–0.80% | ||||||
| Brunswick (City of), MD (Brunswick Crossing); Series 2019, RB | 5.00% | 07/01/2036 | 385 | 386,582 | ||
| Maryland (State of) Health & Higher Educational Facilities Authority (LifeBridge Health); Series 2016, Ref. RB | 5.00% | 07/01/2047 | 770 | 869,731 | ||
| Maryland (State of) Health & Higher Educational Facilities Authority (Peninsula Regional Medical Center); Series 2015, Ref. RB | 5.00% | 07/01/2045 | 1,580 | 1,709,434 | ||
| Maryland Economic Development Corp. (Terminal); Series 2010 B, RB (h)(i) | 5.75% | 06/01/2020 | 1,080 | 1,080,000 | ||
| Maryland Economic Development Corp. (Transportation Facilities); Series 2010 A, RB (h)(i) | 5.38% | 06/01/2020 | 765 | 765,000 | ||
| Prince Georges (County of), MD (Collington Episcopal Life Care Community, Inc.); Series 2017, Ref. RB | 5.00% | 04/01/2029 | 905 | 889,108 | ||
| 5,699,855 | ||||||
| Massachusetts–5.21% | ||||||
| Massachusetts (Commonwealth of) Development Finance Agency (Massachusetts Institute of Technology); Series 2002 K, RB (d) | 5.50% | 07/01/2032 | 2,500 | 3,698,575 | ||
| Massachusetts (Commonwealth of) Transportation Fund Revenue; Series 2016 B, RB | 4.00% | 06/01/2046 | 2,530 | 2,808,730 | ||
| Massachusetts (Commonwealth of) Water Resources Authority; Series 2011 C, Ref. RB (d) | 5.00% | 08/01/2030 | 3,500 | 3,697,330 | ||
| Massachusetts (State of); | ||||||
| Series 2004 A, Ref. GO Bonds (INS - AMBAC)(b) | 5.50% | 08/01/2030 | 1,500 | 2,108,925 | ||
| Series 2005, Ref. RB (INS - NATL)(b) | 5.50% | 01/01/2023 | 1,000 | 1,113,020 | ||
| Massachusetts (State of) (Consolidated Loan of 2019); Series 2019, GO Bonds | 5.00% | 05/01/2047 | 1,000 | 1,271,370 | ||
| Massachusetts (State of) Department of Transportation; Series 1997 C, RB (INS - NATL)(b)(g) | 0.00% | 01/01/2022 | 1,550 | 1,527,695 | ||
| Massachusetts (State of) Development Finance Agency (Boston College); Series 2008, RB | 5.50% | 06/01/2026 | 400 | 508,024 | ||
| Massachusetts (State of) Development Finance Agency (Broad Institute); Series 2011 A, RB (h)(i) | 5.25% | 04/01/2021 | 500 | 520,515 | ||
| Massachusetts (State of) Development Finance Agency (Caregroup); Series 2018 J-2, RB | 5.00% | 07/01/2048 | 2,480 | 2,787,322 | ||
| Massachusetts (State of) Development Finance Agency (Emerson College); Series 2016 A, RB | 5.00% | 01/01/2047 | 3,255 | 3,442,944 | ||
| Massachusetts (State of) Development Finance Agency (Lesley University); Series 2011 B-1, RB (h)(i) | 5.25% | 07/01/2021 | 300 | 316,344 | ||
| Massachusetts (State of) Development Finance Agency (Lowell General Hospital); Series 2010 C, RB | 5.13% | 07/01/2035 | 500 | 501,560 | ||
| Massachusetts (State of) Development Finance Agency (Merrimack College); Series 2012 A, RB | 5.25% | 07/01/2042 | 500 | 508,245 | ||
| Massachusetts (State of) Development Finance Agency (Mount Holyoke College); Series 2011 B, RB (h)(i) | 5.00% | 07/01/2021 | 500 | 525,890 | ||
| Massachusetts (State of) Development Finance Agency (Partners Healthcare); Series 2012 L, RB (h)(i) | 5.00% | 07/01/2021 | 3,425 | 3,602,346 | ||
| Massachusetts (State of) Development Finance Agency (Suffolk University); Series 2010, RB | 5.13% | 07/01/2040 | 500 | 501,700 | ||
| Massachusetts (State of) Development Finance Agency (Tufts Medical Center); | ||||||
| Series 2011 I, RB (h)(i) | 6.75% | 01/01/2021 | 500 | 518,930 | ||
| Series 2011 I, RB (h)(i) | 7.25% | 01/01/2021 | 825 | 858,429 | ||
| Massachusetts (State of) Development Finance Agency (Umass Memorial); | ||||||
| Series 2011 H, RB (h)(i) | 5.50% | 07/01/2021 | 475 | 502,426 | ||
| Series 2011 H, RB | 5.50% | 07/01/2031 | 25 | 25,850 | ||
| Massachusetts (State of) Educational Financing Authority; Series 2011 J, RB (f) | 5.63% | 07/01/2028 | 115 | 119,618 | ||
| Massachusetts (State of) Port Authority; Series 2019 A, Ref. RB (f) | 5.00% | 07/01/2036 | 995 | 1,196,796 | ||
| Massachusetts (State of) Port Authority (Bosfuel); Series 2019 A, Ref. RB (f) | 4.00% | 07/01/2044 | 1,000 | 1,054,050 | ||
| Massachusetts (State of) Port Authority (Conrac); Series 2011 A, RB | 5.13% | 07/01/2041 | 250 | 258,813 | ||
| Massachusetts (State of) Water Resources Authority; | ||||||
| Series 2007 B, Ref. RB (INS - AGM)(b) | 5.25% | 08/01/2031 | 500 | 719,040 | ||
| Series 2011 B, RB (h)(i) | 5.00% | 08/01/2021 | 200 | 211,154 | ||
| Series 2011 C, Ref. RB (d) | 5.00% | 08/01/2031 | 2,000 | 2,112,760 | ||
| 37,018,401 | ||||||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Michigan–4.50% | ||||||
| Detroit Downtown Development Authority; Series 2018 A, Ref. RB (INS - AGM)(b)(d)(k) | 5.00% | 07/01/2043 | $ 2,110 | $ 2,391,748 | ||
| Michigan (State of) Building Authority (Facilities Program); Series 2016 I, Ref. RB (d) | 5.00% | 04/15/2041 | 2,865 | 3,447,025 | ||
| Michigan (State of) Finance Authority (Beaumont Health Credit Group); Series 2016, RB | 5.00% | 11/01/2044 | 1,865 | 2,077,330 | ||
| Michigan (State of) Finance Authority (Bronson Healthcare Group); Series 2020 A, Ref. RB | 5.00% | 05/15/2036 | 1,675 | 1,905,848 | ||
| Michigan (State of) Finance Authority (Charter County of Wayne Criminal Justice Center); Series 2018, RB | 5.00% | 11/01/2038 | 750 | 937,125 | ||
| Michigan (State of) Finance Authority (Detroit Water & Sewerage Department); | ||||||
| Series 2014 C-1, Ref. RB | 5.00% | 07/01/2044 | 1,245 | 1,301,809 | ||
| Series 2014 C-3, Ref. RB (INS - AGM)(b) | 5.00% | 07/01/2032 | 2,500 | 2,844,425 | ||
| Series 2014 C-6, Ref. RB | 5.00% | 07/01/2033 | 625 | 700,563 | ||
| Series 2014 D-4, Ref. RB | 5.00% | 07/01/2029 | 625 | 709,513 | ||
| Series 2015, Ref. RB | 5.00% | 07/01/2035 | 1,270 | 1,501,508 | ||
| Michigan (State of) Finance Authority (MidMichigan Health Credit Group); Series 2014, Ref. RB | 5.00% | 06/01/2039 | 2,275 | 2,501,476 | ||
| Michigan (State of) Finance Authority (Trinity Health Credit); Series 2017 MI, Ref. RB (d) | 5.00% | 12/01/2046 | 3,890 | 4,464,359 | ||
| Michigan (State of) Hospital Finance Authority (Ascension Health); Series 2010, Ref. RB | 5.00% | 11/15/2047 | 1,000 | 1,247,670 | ||
| Michigan (State of) Strategic Fund (I-85 Improvement Project); Series 2018, RB (f) | 5.00% | 06/30/2033 | 600 | 658,260 | ||
| Michigan (State of) Tobacco Settlement Finance Authority; Series 2007 A, RB | 6.00% | 06/01/2048 | 3,305 | 3,305,066 | ||
| Saginaw (City of), MI Hospital Finance Authority (Covenant Medical Center, Inc.); Series 2010 H, Ref. RB (h)(i) | 5.00% | 07/01/2020 | 2,000 | 2,007,760 | ||
| 32,001,485 | ||||||
| Minnesota–0.31% | ||||||
| Bethel (City of), MN (Spectrum High School); | ||||||
| Series 2017 A, Ref. RB | 4.25% | 07/01/2047 | 305 | 287,206 | ||
| Series 2017 A, Ref. RB | 4.38% | 07/01/2052 | 500 | 474,785 | ||
| St. Cloud (City of), MN (CentraCare Health System); Series 2019, Ref. RB | 5.00% | 05/01/2048 | 1,245 | 1,449,977 | ||
| 2,211,968 | ||||||
| Mississippi–0.23% | ||||||
| West Rankin Utility Authority; Series 2018, RB (INS - AGM)(b) | 5.00% | 01/01/2048 | 1,355 | 1,623,182 | ||
| Missouri–1.20% | ||||||
| Kansas (City of), MO Industrial Development Authority (Downtown Redevelopment District); Series 2011 A, Ref. RB | 5.50% | 09/01/2028 | 1,515 | 1,612,036 | ||
| Kansas City (City of), MO Industrial Development Authority (Downtown Redevelopment District); Series 2011 A, Ref. RB | 5.50% | 09/01/2027 | 750 | 798,037 | ||
| Kansas City (City of), MO Industrial Development Authority (Kansas City International Airport); Series 2019 B, RB (INS - AGM)(b)(f) | 5.00% | 03/01/2049 | 1,005 | 1,166,554 | ||
| Kirkwood (City of), MO Industrial Development Authority (Aberdeen Heights); Series 2017 A, Ref. RB | 5.25% | 05/15/2050 | 510 | 453,217 | ||
| Missouri (State of) Health & Educational Facilities Authority (Lutheran Senior Services); | ||||||
| Series 2014, RB | 5.00% | 02/01/2035 | 1,000 | 1,003,250 | ||
| Series 2019, Ref. RB | 5.00% | 02/01/2048 | 330 | 315,229 | ||
| Missouri (State of) Health & Educational Facilities Authority (St. Louis College of Pharmacy); Series 2013, RB | 5.25% | 05/01/2033 | 1,175 | 1,219,133 | ||
| St. Louis (County of), MO Industrial Development Authority (Friendship Village West County); Series 2018 A, RB | 5.00% | 09/01/2038 | 2,095 | 1,952,288 | ||
| 8,519,744 | ||||||
| Nebraska–1.78% | ||||||
| Central Plains Energy Project (No. 3); | ||||||
| Series 2012, RB (o) | 5.00% | 09/01/2032 | 3,500 | 3,762,360 | ||
| Series 2012, RB (o) | 5.25% | 09/01/2037 | 2,485 | 2,684,943 | ||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2034 | 205 | 260,215 | ||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2042 | 2,160 | 2,824,913 | ||
| Central Plains Energy Project (No. 4); Series 2018, RB (i) | 5.00% | 01/01/2024 | 1,805 | 2,005,571 | ||
| Douglas (County of), NE Hospital Authority No. 2 (Madonna Rehabilitation Hospital); Series 2014, RB | 5.00% | 05/15/2044 | 1,000 | 1,080,510 | ||
| 12,618,512 | ||||||
| New Hampshire–0.35% | ||||||
| National Finance Authority; Series 2020-1, Class A | 4.13% | 01/20/2034 | 1 | 1,231 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| New Hampshire–(continued) | ||||||
| New Hampshire (State of) Health and Education Facilities Authority Act; Series 2020 A, RB | 5.00% | 08/01/2059 | $ 1,800 | $ 2,477,106 | ||
| 2,478,337 | ||||||
| New Jersey–11.24% | ||||||
| Colts Neck (Township of), NJ Board of Education; Series 2002, GO Bonds (h) | 5.00% | 02/01/2021 | 485 | 486,731 | ||
| East Orange (City of), NJ Board of Education; | ||||||
| Series 1998, COP (INS - AGM)(b)(g) | 0.00% | 02/01/2025 | 1,845 | 1,757,842 | ||
| Series 1998, COP (INS - AGM)(b)(g) | 0.00% | 02/01/2028 | 2,850 | 2,547,986 | ||
| Essex (County of), NJ Improvement Authority; Series 2004, Ref. RB (INS - NATL)(b) | 5.50% | 10/01/2028 | 1,000 | 1,385,760 | ||
| Essex (County of), NJ Improvement Authority (Newark); Series 2010 A, RB (h)(i) | 6.25% | 11/01/2020 | 1,000 | 1,024,590 | ||
| Garden State Preservation Trust; | ||||||
| Series 2003 B, RB (INS - AGM)(b)(g) | 0.00% | 11/01/2025 | 2,000 | 1,792,380 | ||
| Series 2005 A, RB (INS - AGM)(b) | 5.75% | 11/01/2028 | 1,920 | 2,373,734 | ||
| New Jersey (State of) Economic Development Authority; | ||||||
| Series 1992, RB (INS - NATL)(b) | 5.90% | 03/15/2021 | 8,635 | 8,924,445 | ||
| Series 2005 N-1, Ref. RB (INS - NATL)(b)(d)(k) | 5.50% | 09/01/2022 | 3,775 | 3,942,157 | ||
| Series 2005 N-1, Ref. RB (INS - AMBAC)(b) | 5.50% | 09/01/2026 | 1,500 | 1,652,685 | ||
| Series 2012, Ref. RB | 5.00% | 06/15/2029 | 1,000 | 1,054,140 | ||
| New Jersey (State of) Economic Development Authority (American Water Co., Inc.); Series 2010 B, Ref. RB (f) | 5.60% | 11/01/2034 | 1,000 | 1,003,480 | ||
| New Jersey (State of) Economic Development Authority (Continental Airlines, Inc.); Series 1999, RB (f) | 5.13% | 09/15/2023 | 875 | 872,918 | ||
| New Jersey (State of) Economic Development Authority (Kapkowski Road Landfill); | ||||||
| Series 2002, Ref. RB | 5.75% | 10/01/2021 | 570 | 571,858 | ||
| Series 2002, Ref. RB | 5.75% | 04/01/2031 | 1,000 | 988,810 | ||
| New Jersey (State of) Economic Development Authority (Port Newark Container Terminal LLC); Series 2017, Ref. RB (f) | 5.00% | 10/01/2037 | 955 | 1,015,728 | ||
| New Jersey (State of) Economic Development Authority (Provident Group-Montclair Properties LLC-Montclair State University Student Housing); Series 2010 A, RB (h)(i) | 5.88% | 06/01/2020 | 2,650 | 2,650,000 | ||
| New Jersey (State of) Economic Development Authority (The Goethals Bridge Replacement); | ||||||
| Series 2013, RB (f) | 5.13% | 01/01/2034 | 1,250 | 1,353,463 | ||
| Series 2013, RB (f) | 5.38% | 01/01/2043 | 1,000 | 1,084,640 | ||
| New Jersey (State of) Educational Facilities Authority (Institute of Technology); Series 2010 H, RB | 5.00% | 07/01/2031 | 500 | 500,680 | ||
| New Jersey (State of) Health Care Facilities Financing Authority (AHS Hospital Corp.); Series 2011, RB (h)(i) | 6.00% | 07/01/2021 | 750 | 796,335 | ||
| New Jersey (State of) Health Care Facilities Financing Authority (Barnabas Health); Series 2011 A, Ref. RB (h)(i) | 5.63% | 07/01/2021 | 1,000 | 1,057,960 | ||
| New Jersey (State of) Health Care Facilities Financing Authority (Holy Name Medical Center); Series 2010, Ref. RB | 5.00% | 07/01/2025 | 500 | 501,140 | ||
| New Jersey (State of) Health Care Facilities Financing Authority (St. Clare’s Hospital, Inc.); Series 2004 A, Ref. RB (h) | 5.25% | 07/01/2023 | 1,000 | 1,152,670 | ||
| New Jersey (State of) Higher Education Student Assistance Authority; | ||||||
| Series 2010 1-A, Ref. RB (d) | 5.00% | 12/01/2025 | 1,905 | 1,905,000 | ||
| Series 2010 1-A, Ref. RB (d) | 5.00% | 12/01/2026 | 1,185 | 1,185,000 | ||
| Series 2018 B, Ref. RB (f) | 5.00% | 12/01/2024 | 1,110 | 1,264,090 | ||
| New Jersey (State of) Transportation Trust Fund Authority; | ||||||
| Series 2009 A, RB (g) | 0.00% | 12/15/2039 | 6,000 | 2,300,220 | ||
| Series 2010 A, RB (g) | 0.00% | 12/15/2030 | 1,600 | 1,013,936 | ||
| Series 2010 A, RB (g) | 0.00% | 12/15/2031 | 3,000 | 1,800,660 | ||
| Series 2011 A, RB (h)(i) | 5.50% | 06/15/2021 | 800 | 843,864 | ||
| Series 2011 B, RB | 5.50% | 06/15/2031 | 1,060 | 1,076,769 | ||
| Series 2014, RB | 5.00% | 06/15/2030 | 925 | 1,003,486 | ||
| Series 2018 A, Ref. RB | 5.00% | 12/15/2032 | 1,240 | 1,321,245 | ||
| Series 2018 A, Ref. RN (d)(k) | 5.00% | 06/15/2029 | 1,590 | 1,720,205 | ||
| Series 2018 A, Ref. RN (d)(k) | 5.00% | 06/15/2030 | 550 | 591,976 | ||
| Series 2018 A, Ref. RN (d)(k) | 5.00% | 06/15/2031 | 1,005 | 1,076,657 | ||
| Subseries 2016 A-1, RN | 5.00% | 06/15/2028 | 1,015 | 1,103,569 | ||
| New Jersey (State of) Turnpike Authority; | ||||||
| Series 2005 A, Ref. RB (INS - AGM)(b) | 5.25% | 01/01/2027 | 705 | 891,980 | ||
| Series 2013 A, RB (h)(i) | 5.00% | 07/01/2022 | 1,900 | 2,090,513 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| New Jersey–(continued) | ||||||
| New Jersey Economic Development Authority; Series 2004 A, RB (INS - BHAC)(b)(d) | 5.25% | 07/01/2026 | $ 7,000 | $ 7,808,850 | ||
| New Jersey Institute of Technology; Series 2012 A, RB (h)(i) | 5.00% | 07/01/2022 | 500 | 549,415 | ||
| Rahway Valley Sewerage Authority; Series 2005 A, RB (INS - NATL)(b)(g) | 0.00% | 09/01/2032 | 5,000 | 3,925,950 | ||
| Salem (County of), NJ Improvement Authority (Finlaw Street Office Building); Series 2007, RB (INS - AGM)(b) | 5.25% | 08/15/2032 | 1,300 | 1,303,991 | ||
| Salem (County of), NJ Pollution Control Financing Authority (Chambers); Series 2014 A, Ref. PCR (f) | 5.00% | 12/01/2023 | 815 | 845,652 | ||
| Tobacco Settlement Financing Corp.; | ||||||
| Series 2018 A, Ref. RB | 5.00% | 06/01/2046 | 2,515 | 2,763,281 | ||
| Series 2018 A, Ref. RB | 5.25% | 06/01/2046 | 835 | 933,079 | ||
| 79,811,520 | ||||||
| New Mexico–0.50% | ||||||
| Farmington (City of), NM (Public Service Co. of New Mexico San Juan); | ||||||
| Series 2010 A, Ref. PCR (i) | 5.20% | 06/01/2020 | 1,000 | 1,000,000 | ||
| Series 2010 C, Ref. PCR | 5.90% | 06/01/2040 | 2,100 | 2,102,142 | ||
| Santa Fe (City of), NM (El Castillo Retirement); Series 2019 A, RB | 5.00% | 05/15/2049 | 500 | 442,285 | ||
| 3,544,427 | ||||||
| New York–18.56% | ||||||
| Build NYC Resource Corp. (Brooklyn Navy Yard); Series 2019, Ref. RB (e)(f) | 5.25% | 12/31/2033 | 400 | 376,632 | ||
| Erie Tobacco Asset Securitization Corp.; Series 2005 A, RB | 5.00% | 06/01/2045 | 2,710 | 2,710,136 | ||
| Hudson Yards Infrastructure Corp; Series 2020-XF2859, Ctfs. (INS - AGM)(b)(d) | 4.00% | 02/15/2047 | 3,320 | 3,626,801 | ||
| Metropolitan Transportation Authority; | ||||||
| Series 2010 D, RB (h)(i) | 5.25% | 11/15/2020 | 2,500 | 2,558,150 | ||
| Series 2013 B, RB | 5.00% | 11/15/2038 | 1,850 | 1,890,663 | ||
| Series 2016 A1, RB | 5.00% | 11/15/2041 | 1,980 | 2,062,625 | ||
| Series 2016 B, Ref. RB | 5.00% | 11/15/2037 | 145 | 152,128 | ||
| Series 2017 C1, RB | 5.00% | 11/15/2023 | 600 | 626,850 | ||
| Series 2020 A-1, RB (INS - BAM)(b) | 4.00% | 11/15/2053 | 395 | 418,546 | ||
| Series 2020 A-2, RB | 4.00% | 02/01/2022 | 1,170 | 1,173,873 | ||
| Series 2020 C-1, RB | 5.25% | 11/15/2055 | 1,335 | 1,470,876 | ||
| New York & New Jersey (States of) Port Authority; | ||||||
| Eighty-Fifth Series 1993, RB (INS - NATL)(b) | 5.38% | 03/01/2028 | 2,000 | 2,347,460 | ||
| Two Hundred Seventh Series 2018, Ref. RB (d)(f) | 5.00% | 09/15/2028 | 3,300 | 4,021,743 | ||
| New York & New Jersey (States of) Port Authority (JFK International Air Terminal LLC); | ||||||
| Series 2010 8, RB | 6.00% | 12/01/2036 | 2,050 | 2,061,644 | ||
| Series 2010, RB | 5.50% | 12/01/2031 | 670 | 673,846 | ||
| Series 2010, RB | 6.00% | 12/01/2042 | 710 | 714,849 | ||
| New York (City of), NY Municipal Water Finance Authority; | ||||||
| Series 2012 FF, RB (d) | 5.00% | 06/15/2045 | 6,915 | 7,438,327 | ||
| Series 2013 DD, RB | 5.00% | 06/15/2035 | 3,200 | 3,563,712 | ||
| New York (City of), NY Transitional Finance Authority; | ||||||
| Series 2013 I, RB | 5.00% | 05/01/2038 | 5,000 | 5,521,250 | ||
| Series 2018 S-2A, Ref. RB | 5.00% | 07/15/2034 | 1,240 | 1,546,913 | ||
| Subseries 2011 D-1, RB (d) | 5.00% | 11/01/2033 | 4,845 | 5,103,432 | ||
| Subseries 2013, RB (d) | 5.00% | 11/01/2038 | 5,010 | 5,613,505 | ||
| New York (City of), NY Water & Sewer System; Series 2019 EE-2, Ref. RB (d) | 4.00% | 06/15/2040 | 2,805 | 3,291,527 | ||
| New York (Counties of), NY Tobacco Trust VI; Subseries 2016 A-1, Ref. RB | 5.75% | 06/01/2043 | 3,170 | 3,402,329 | ||
| New York (State of) Dormitory Authority; | ||||||
| Series 2009 C, RB (INS - AGC)(b) | 5.00% | 10/01/2023 | 180 | 180,623 | ||
| Series 2018 E, RB (d) | 5.00% | 03/15/2045 | 5,715 | 6,958,413 | ||
| New York (State of) Dormitory Authority (General Purpose); | ||||||
| Series 2011 A, RB (d) | 5.00% | 03/15/2030 | 2,220 | 2,297,545 | ||
| Series 2013 A, RB (h)(i) | 5.00% | 02/15/2023 | 1,750 | 1,976,310 | ||
| Series 2014 C, RB (d) | 5.00% | 03/15/2040 | 5,510 | 6,212,194 | ||
| Series 2018 A, Ref. RB | 5.25% | 03/15/2038 | 1,240 | 1,550,905 | ||
| New York (State of) Dormitory Authority (New York University); Series 1998 A, RB (INS - NATL)(b) | 5.75% | 07/01/2027 | 1,000 | 1,218,220 | ||
| New York (State of) Metropolitan Transportation Authority; Subseries 2015 A-2, RB (SIFMA Municipal Swap Index + 0.58%)(i)(l) | 0.72% | 11/15/2039 | 580 | 580,000 | ||
| New York (State of) Utility Debt Securitization Authority; Series 2013 TE, RB (d) | 5.00% | 12/15/2031 | 1,905 | 2,183,816 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| New York–(continued) | ||||||
| New York City Transitional Finance Authority; Series 2020 C-1, RB | 4.00% | 05/01/2037 | $ 2,505 | $ 2,958,505 | ||
| New York City Transitional Finance Authority Future Tax Secured Revenue; Series 2020-XF2864, Ctfs. (d) | 4.00% | 11/01/2045 | 3,345 | 3,808,015 | ||
| New York Liberty Development Corp. (3 World Trade Center); Series 2014, Class 1, Ref. RB (e) | 5.00% | 11/15/2044 | 6,570 | 6,514,878 | ||
| New York Liberty Development Corp. (7 World Trade Center); Series 2012, Class 2, Ref. RB | 5.00% | 09/15/2043 | 1,870 | 1,992,803 | ||
| New York Power Authority; Series 2020-XF0956, Ctfs. (d) | 4.00% | 11/15/2050 | 3,675 | 4,288,358 | ||
| New York State Thruway Authority; | ||||||
| Series 2020-XM0830, Ctfs. (d) | 4.00% | 01/01/2050 | 5,400 | 5,786,748 | ||
| Series 2020-XX1127, Ctfs. (INS - AGM)(b)(d)(k) | 4.00% | 01/01/2050 | 2,625 | 2,846,970 | ||
| New York Transportation Development Corp. (American Airlines, Inc.); | ||||||
| Series 2016, Ref. RB (f) | 5.00% | 08/01/2026 | 1,585 | 1,530,349 | ||
| Series 2016, Ref. RB (f) | 5.00% | 08/01/2031 | 770 | 742,496 | ||
| New York Transportation Development Corp. (Delta Air Lines, Inc. LaGuardia Airport Terminal C&D Redevelopment); | ||||||
| Series 2018, RB (f) | 5.00% | 01/01/2031 | 240 | 241,502 | ||
| Series 2018, RB (f) | 5.00% | 01/01/2033 | 2,100 | 2,113,146 | ||
| Series 2018, RB (f) | 5.00% | 01/01/2034 | 2,030 | 2,042,708 | ||
| Series 2018, RB (f) | 4.00% | 01/01/2036 | 1,510 | 1,477,686 | ||
| Series 2018, RB (f) | 5.00% | 01/01/2036 | 640 | 644,006 | ||
| New York Transportation Development Corp. (LaGuardia Airport Terminal B Redevelopment); | ||||||
| Series 2016 A, RB (f) | 5.00% | 07/01/2046 | 3,235 | 3,379,184 | ||
| Series 2016 A, RB (f) | 5.25% | 01/01/2050 | 1,775 | 1,867,353 | ||
| Rockland Tobacco Asset Securitization Corp.; Series 2001, RB | 5.75% | 08/15/2043 | 1,735 | 1,749,262 | ||
| Triborough Bridge and Tunnel Authority; Series 1992 Y, RB (h) | 6.13% | 01/01/2021 | 315 | 325,918 | ||
| TSASC, Inc.; Series 2016 B, Ref. RB | 5.00% | 06/01/2045 | 2,125 | 2,003,025 | ||
| 131,838,755 | ||||||
| North Carolina–2.99% | ||||||
| Charlotte (City of), NC (Charlotte Douglas International Airport); Series 2019, RB | 4.00% | 07/01/2044 | 645 | 707,443 | ||
| North Carolina (State of) Department of Transportation (I-77 HOT Lanes); Series 2015, RB (f) | 5.00% | 06/30/2054 | 3,120 | 3,184,334 | ||
| North Carolina (State of) Turnpike Authority; Series 2011, RB (d) | 5.00% | 07/01/2036 | 2,870 | 2,995,189 | ||
| North Carolina Capital Facilities Finance Agency; Series 2015 B, Ref. RB (d) | 5.00% | 10/01/2055 | 9,585 | 11,925,273 | ||
| University of North Carolina at Chapel Hill (University of North Carolina Hospital); Series 2019, RB | 5.00% | 02/01/2049 | 1,645 | 2,429,073 | ||
| 21,241,312 | ||||||
| North Dakota–0.74% | ||||||
| McLean (County of), ND (Great River Energy); Series 2010 B, RB | 5.15% | 07/01/2040 | 1,000 | 1,003,600 | ||
| Ward (County of), ND (Trinity Obligated Group); | ||||||
| Series 2017 C, RB | 5.00% | 06/01/2043 | 2,165 | 2,262,360 | ||
| Series 2017 C, RB | 5.00% | 06/01/2048 | 1,930 | 2,009,651 | ||
| 5,275,611 | ||||||
| Ohio–10.80% | ||||||
| Akron (City of), OH (Community Learning Centers); Series 2012, Ref. RB | 5.00% | 12/01/2033 | 1,270 | 1,383,094 | ||
| Akron, Bath & Copley Joint Township Hospital District (Medical Center of Akron); Series 2012, RB | 5.00% | 11/15/2032 | 1,190 | 1,246,275 | ||
| Akron, Bath & Copley Joint Township Hospital District (Summa Health Obligated Group); Series 2016, Ref. RB | 5.25% | 11/15/2046 | 2,645 | 2,868,556 | ||
| American Municipal Power, Inc.; Series 2015 A, Ref. RB | 5.00% | 02/15/2042 | 1,075 | 1,203,946 | ||
| American Municipal Power, Inc. (Amp Fremont Energy Center); Series 2012, RB | 5.00% | 02/15/2037 | 2,470 | 2,634,477 | ||
| American Municipal Power, Inc. (Greenup Hydroelectric); Series 2016 A, RB | 5.00% | 02/15/2046 | 535 | 621,948 | ||
| Bowling Green (City of), OH (CFP I LLC - Bowling Green State University); Series 2010, RB (h)(i) | 5.75% | 06/01/2020 | 1,000 | 1,000,000 | ||
| Buckeye Tobacco Settlement Financing Authority; | ||||||
| Series 2020 A-2, Ref. RB | 4.00% | 06/01/2039 | 470 | 524,976 | ||
| Series 2020 A-2, Ref. RB | 4.00% | 06/01/2048 | 3,165 | 3,349,583 | ||
| Series 2020 B-2, Ref. RB | 5.00% | 06/01/2055 | 10,600 | 10,713,102 | ||
| Series 2020 B-3, Ref. RB (g) | 0.00% | 06/01/2057 | 3,595 | 465,049 | ||
| Butler (County of), OH (Kettering Health Network Obligated Group); Series 2011, RB | 6.38% | 04/01/2036 | 375 | 386,899 | ||
| Cincinnati (City of), OH; Series 2011 A, Ref. RB (d) | 5.00% | 12/01/2036 | 5,000 | 5,362,550 | ||
| Cleveland (City of) & Cuyahoga (County of), OH Port Authority (Constellation Schools); Series 2014 A, Ref. RB | 6.50% | 01/01/2034 | 1,100 | 1,128,072 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Ohio–(continued) | ||||||
| Columbus-Franklin (County of), OH Finance Authority (Easton); Series 2020, RB (e) | 5.00% | 06/01/2028 | $ 835 | $ 837,129 | ||
| Cuyahoga (County of), OH (Medical Mart/Convention Center); Series 2010 F, RB | 5.00% | 12/01/2027 | 500 | 510,525 | ||
| Cuyahoga (County of), OH (Metrohealth System); Series 2017, Ref. RB | 5.50% | 02/15/2052 | 1,690 | 1,808,655 | ||
| Franklin (County of), OH (Ohio Presbyterian Retirement Services); Series 2010 A, RB | 5.63% | 07/01/2026 | 1,000 | 1,003,170 | ||
| Franklin (County of), OH (OhioHealth Corp.); | ||||||
| Series 2011 A, RB (d) | 5.00% | 11/15/2036 | 930 | 972,231 | ||
| Series 2011 A, RB | 5.00% | 11/15/2036 | 750 | 784,058 | ||
| Series 2011 A, RB (d) | 5.00% | 11/15/2041 | 1,500 | 1,565,085 | ||
| Gallia (County of), OH (Holzer Health System Obligated Group); Series 2012, Ref. RB | 8.00% | 07/01/2042 | 1,530 | 1,679,099 | ||
| Hamilton (County of), OH; | ||||||
| Series 2000 B, RB (INS - AMBAC)(b)(g) | 0.00% | 12/01/2023 | 2,000 | 1,921,960 | ||
| Series 2011 A, Ref. RB | 5.00% | 12/01/2032 | 1,000 | 1,054,130 | ||
| Hamilton (County of), OH (Life Enriching Communities); Series 2016, Ref.RB | 5.00% | 01/01/2046 | 1,490 | 1,382,511 | ||
| Hamilton (County of), OH (Stratford Heights-University of Cincinnati); Series 2010, Ref. RB (INS - AGM)(b) | 5.00% | 06/01/2030 | 1,000 | 1,003,420 | ||
| Hamilton (County of), OH (Trihealth, Inc. Obligated Group); Series 2017 A, RB | 5.00% | 08/15/2047 | 2,470 | 2,799,844 | ||
| Hancock (County of), OH (Blanchard Valley Regional Health Center); Series 2011 A, RB (h)(i) | 6.25% | 06/01/2021 | 1,300 | 1,376,011 | ||
| Lucas (County of), OH (Lutheran Homes); Series 2010 A, Ref. RB (h)(i) | 7.00% | 11/01/2020 | 1,000 | 1,027,950 | ||
| Lucas (County of), OH (ProMedica Healthcare System); | ||||||
| Series 2011 A, RB (h)(i) | 5.75% | 11/15/2021 | 1,000 | 1,079,710 | ||
| Series 2011 A, RB (h)(i) | 6.00% | 11/15/2021 | 1,000 | 1,083,020 | ||
| Series 2018 A, Ref. RB | 5.25% | 11/15/2048 | 1,675 | 1,724,446 | ||
| Miami University; Series 2011, Ref. RB (d) | 5.00% | 09/01/2031 | 5,050 | 5,340,779 | ||
| Montgomery (County of), OH (Trousdale Foundation Properties); Series 2018 A, RB (e) | 6.00% | 04/01/2038 | 1,410 | 836,384 | ||
| Norwood (City of), OH (Cornerstone at Norwood); Series 2006, RB | 6.20% | 12/01/2031 | 1,340 | 1,304,624 | ||
| Ohio (State of) (Portsmouth Bypass); Series 2015, RB (INS - AGM)(b)(f) | 5.00% | 12/31/2039 | 805 | 916,782 | ||
| Ohio (State of) Air Quality Development Authority (Ohio Valley Electric Corp.); Series 2014, RB (f)(i) | 2.60% | 10/01/2029 | 1,000 | 1,010,550 | ||
| Ohio (State of) Air Quality Development Authority (Pratt Paper LLC); Series 2017, RB (e)(f) | 4.25% | 01/15/2038 | 585 | 589,276 | ||
| Ohio (State of) Higher Educational Facility Commission (Summa Health System); | ||||||
| Series 2010, RB | 5.75% | 11/15/2035 | 1,330 | 1,334,482 | ||
| Series 2010, RB | 5.75% | 11/15/2040 | 220 | 220,706 | ||
| Ohio (State of) Higher Educational Facility Commission (University of Dayton); Series 2011 A, RB | 5.38% | 12/01/2030 | 750 | 761,063 | ||
| Ohio (State of) Housing Finance Agency (Covenant House Apartments); Series 2008 C, RB (CEP - GNMA)(f) | 5.85% | 09/20/2028 | 495 | 495,663 | ||
| Ohio (State of) Housing Finance Agency (Mortgage-Backed Securities Program); Series 1999 A1, RB (CEP - GNMA)(f) | 5.25% | 09/01/2030 | 25 | 25,061 | ||
| Ohio (State of) Municipal Electric Generation Agency (Joint Venture 5); Series 2001, Beneficial Interest Ctfs. (INS - NATL)(b)(g) | 0.00% | 02/15/2030 | 1,000 | 854,830 | ||
| Ohio (State of) Water Development Authority (Water Pollution Control Loan Fund); Series 2020 A, RB | 5.00% | 12/01/2050 | 1,670 | 2,165,706 | ||
| Ohio State University (The); | ||||||
| Series 2010 D, RB (h) | 5.00% | 12/01/2030 | 45 | 63,496 | ||
| Series 2010 D, RB | 5.00% | 12/01/2030 | 955 | 1,333,256 | ||
| Summit (County of), OH Port Authority (University of Akron Student Housing); Series 2011, RB (h)(i) | 5.00% | 01/01/2021 | 500 | 513,824 | ||
| Toledo (City of), OH; Series 2010, Ref. GO Bonds (INS - AGM)(b) | 5.00% | 12/01/2028 | 1,000 | 1,022,830 | ||
| University of Cincinnati; | ||||||
| Series 2010 F, RB (h)(i) | 5.00% | 12/01/2020 | 725 | 742,175 | ||
| Series 2010 F, RB | 5.00% | 06/01/2034 | 20 | 20,427 | ||
| Series 2010, RB (h)(i) | 5.00% | 12/01/2020 | 5 | 5,117 | ||
| University of Toledo; Series 2011 B, RB (h)(i) | 5.00% | 06/01/2021 | 650 | 679,731 | ||
| 76,738,243 | ||||||
| Oklahoma–1.57% | ||||||
| Edmond Public Works Authority; | ||||||
| Series 2017, RB (d) | 5.00% | 07/01/2042 | 2,735 | 3,327,784 | ||
| Series 2017, RB (d) | 5.00% | 07/01/2047 | 2,670 | 3,216,416 | ||
| Oklahoma (State of) Development Finance Authority (OU Medicine); Series 2018 B, RB | 5.50% | 08/15/2057 | 2,180 | 2,380,255 | ||
| Oklahoma (State of) Development Finance Authority (Provident Oklahoma Education Resources, Inc.-Cross Village Student Housing); Series 2017, RB (c) | 5.00% | 08/01/2052 | 1,945 | 778,000 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Oklahoma–(continued) | ||||||
| Oklahoma (State of) Water Resources Board; Series 2018 C, RB | 4.00% | 10/01/2048 | $ 1,260 | $ 1,430,125 | ||
| 11,132,580 | ||||||
| Oregon–0.59% | ||||||
| University of Oregon; Series 2020, RB (d)(k) | 5.00% | 04/01/2050 | 3,350 | 4,211,185 | ||
| Pennsylvania–3.29% | ||||||
| Allegheny (County of), PA Hospital Development Authority (Allegheny Health Network Obligated Group Issue); Series 2018 A, Ref. RB | 5.00% | 04/01/2047 | 1,600 | 1,792,752 | ||
| Allegheny (County of), PA Hospital Development Authority (Allegheny Health Network); Series 2018 A, Ref. RB | 4.00% | 04/01/2044 | 835 | 864,041 | ||
| Franklin (County of), PA Industrial Development Authority (Chambersburg Hospital); Series 2010, RB (h)(i) | 5.38% | 07/01/2020 | 1,900 | 1,907,790 | ||
| Franklin (County of), PA Industrial Development Authority (Menno-Haven, Inc.); Series 2018, Ref. RB | 5.00% | 12/01/2024 | 500 | 499,005 | ||
| Pennsylvania (State of) Turnpike Commission; | ||||||
| Series 2014 A, RB (j) | 4.75% | 12/01/2037 | 990 | 1,077,377 | ||
| Series 2018 A-2, RB | 5.00% | 12/01/2048 | 1,195 | 1,416,302 | ||
| Series 2018 B, RB | 5.25% | 12/01/2048 | 1,170 | 1,398,033 | ||
| Subseries 2010 B-2, RB (h)(i)(j) | 5.75% | 12/01/2020 | 2,250 | 2,311,695 | ||
| Subseries 2010 B-2, RB (h)(i)(j) | 6.00% | 12/01/2020 | 1,400 | 1,439,970 | ||
| Subseries 2014 A-2, RB (j) | 5.13% | 12/01/2039 | 2,000 | 2,048,960 | ||
| Philadelphia (City of), PA; | ||||||
| Series 2017 A, RB | 5.00% | 10/01/2052 | 1,100 | 1,309,990 | ||
| Series 2017 B, Ref. RB (f) | 5.00% | 07/01/2047 | 4,940 | 5,533,343 | ||
| Philadelphia (City of), PA Industrial Development Authority (Thomas Jefferson University); | ||||||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2035 | 720 | 810,094 | ||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2047 | 845 | 930,134 | ||
| 23,339,486 | ||||||
| Puerto Rico–4.03% | ||||||
| Children’s Trust Fund; | ||||||
| Series 2002, RB | 5.50% | 05/15/2039 | 3,450 | 3,467,940 | ||
| Series 2002, RB | 5.63% | 05/15/2043 | 1,490 | 1,496,258 | ||
| Series 2005 A, RB (g) | 0.00% | 05/15/2050 | 5,915 | 870,688 | ||
| Series 2005 B, RB (g) | 0.00% | 05/15/2055 | 2,540 | 203,403 | ||
| Series 2008 A, RB (g) | 0.00% | 05/15/2057 | 14,970 | 819,607 | ||
| Puerto Rico (Commonwealth of); | ||||||
| Series 2003 C-7, Ref. GO Bonds (INS - NATL)(b) | 6.00% | 07/01/2027 | 400 | 404,004 | ||
| Series 2004 A, GO Bonds (INS - NATL)(b) | 5.25% | 07/01/2021 | 490 | 492,156 | ||
| Series 2012 A, Ref. GO Bonds (INS - AGM)(b) | 5.00% | 07/01/2035 | 460 | 464,214 | ||
| Puerto Rico (Commonwealth of) Aqueduct & Sewer Authority; Series 2008 A, RB | 6.00% | 07/01/2044 | 1,505 | 1,527,575 | ||
| Puerto Rico (Commonwealth of) Electric Power Authority; | ||||||
| Series 2007 VV, Ref. RB (INS - NATL)(b) | 5.25% | 07/01/2032 | 1,840 | 1,821,802 | ||
| Series 2007 VV, Ref. RB (INS - NATL)(b) | 5.25% | 07/01/2033 | 735 | 725,805 | ||
| Series 2007 VV, Ref. RB (INS - NATL)(b) | 5.25% | 07/01/2035 | 645 | 635,235 | ||
| Puerto Rico (Commonwealth of) Highway & Transportation Authority; | ||||||
| Series 2007 CC, Ref. RB (INS - AGM)(b) | 5.25% | 07/01/2033 | 1,230 | 1,309,077 | ||
| Series 2007 N, Ref. RB (INS - NATL)(b) | 5.25% | 07/01/2032 | 770 | 762,385 | ||
| Series 2007 N, Ref. RB (INS - AGC)(b) | 5.25% | 07/01/2034 | 1,205 | 1,284,855 | ||
| Series 2007 N, Ref. RB (INS - AGC)(b) | 5.25% | 07/01/2036 | 1,000 | 1,066,160 | ||
| Puerto Rico (Commonwealth of) Public Buildings Authority; Series 2007 M-3, Ref. RB (INS - NATL)(b) | 6.00% | 07/01/2024 | 2,020 | 2,040,220 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Puerto Rico–(continued) | ||||||
| Puerto Rico Sales Tax Financing Corp.; | ||||||
| Series 2018 A-1, RB (g) | 0.00% | 07/01/2027 | $ 450 | $ 355,433 | ||
| Series 2018 A-1, RB (g) | 0.00% | 07/01/2029 | 1,495 | 1,083,262 | ||
| Series 2018 A-1, RB (g) | 0.00% | 07/01/2031 | 338 | 222,482 | ||
| Series 2018 A-1, RB (g) | 0.00% | 07/01/2033 | 2,120 | 1,272,933 | ||
| Series 2018 A-1, RB (g) | 0.00% | 07/01/2051 | 4,200 | 796,740 | ||
| Series 2018 A-1, RB | 4.75% | 07/01/2053 | 1,360 | 1,326,707 | ||
| Series 2018 A-1, RB | 5.00% | 07/01/2058 | 3,130 | 3,140,204 | ||
| Series 2019 A-2, RB | 4.33% | 07/01/2040 | 1,095 | 1,053,937 | ||
| 28,643,082 | ||||||
| South Carolina–1.42% | ||||||
| South Carolina (State of) Jobs-Economic Development Authority (Palmetto Health Alliance); Series 2013 A, Ref. RB (h)(i) | 5.25% | 08/01/2023 | 1,600 | 1,848,096 | ||
| South Carolina (State of) Ports Authority; Series 2015, RB (f)(h)(i) | 5.25% | 07/01/2025 | 3,215 | 3,976,505 | ||
| South Carolina (State of) Public Service Authority; Series 2014, Ref. RB | 5.00% | 12/01/2046 | 1,190 | 1,274,300 | ||
| South Carolina (State of) Public Service Authority (Santee Cooper); Series 2010 B, Ref. RB (d) | 5.00% | 01/01/2033 | 3,000 | 3,005,760 | ||
| 10,104,661 | ||||||
| South Dakota–0.47% | ||||||
| South Dakota (State of) Health & Educational Facilities Authority (Sanford Obligated Group); | ||||||
| Series 2014 B, RB | 5.00% | 11/01/2044 | 1,620 | 1,763,921 | ||
| Series 2015, Ref. RB | 5.00% | 11/01/2045 | 1,440 | 1,593,360 | ||
| 3,357,281 | ||||||
| Tennessee–0.78% | ||||||
| Greeneville (Town of), TN Health & Educational Facilities Board (Ballad Health); Series 2018 A, Ref. RB | 5.00% | 07/01/2036 | 1,735 | 1,949,151 | ||
| Nashville (City of) & Davidson (County of), TN Metropolitan Government Health & Educational Facilities Board (Lipscomb University); Series 2019 A, Ref. RB | 5.00% | 10/01/2037 | 1,000 | 1,092,040 | ||
| Nashville (City of) & Davidson (County of), TN Metropolitan Government Health & Educational Facilities Board (The) (Vanderbilt University Medical Center); Series 2016 A, RB | 5.00% | 07/01/2046 | 1,450 | 1,621,201 | ||
| Nashville (City of), TN Metropolitan Airport Authority; Series 2019 B, RB (f) | 5.00% | 07/01/2049 | 655 | 770,673 | ||
| Tennessee Energy Acquisition Corp.; Series 2006 C, RB | 5.00% | 02/01/2024 | 120 | 131,879 | ||
| 5,564,944 | ||||||
| Texas–14.67% | ||||||
| Austin (City of), TX; Series 2012, Ref. RB | 5.00% | 11/15/2042 | 1,710 | 1,864,362 | ||
| Clifton Higher Education Finance Corp. (International Leadership of Texas); Series 2018 D, RB | 5.75% | 08/15/2033 | 1,675 | 1,801,580 | ||
| Dallas-Fort Worth (Cities of), TX International Airport; | ||||||
| Series 2012 G, Ref. RB | 5.00% | 11/01/2035 | 2,390 | 2,423,842 | ||
| Series 2013 A, RB (f) | 5.00% | 11/01/2030 | 1,825 | 1,952,093 | ||
| Houston (City of), TX; | ||||||
| Series 2011 D, RB (d) | 5.00% | 11/15/2031 | 1,865 | 1,993,387 | ||
| Series 2011 D, RB (d) | 5.00% | 11/15/2033 | 900 | 961,956 | ||
| Series 2011 D, RB (d) | 5.00% | 11/15/2036 | 995 | 1,063,496 | ||
| Series 2018, RB (f) | 5.00% | 07/15/2028 | 495 | 494,970 | ||
| Houston (City of), TX Airport System (United Airlines, Inc. Airport Improvement); Series 2015 C, Ref. RB (f) | 5.00% | 07/15/2020 | 850 | 847,833 | ||
| Houston (City of), TX Airport System (United Airlines, Inc. Terminal E); Series 2014, Ref. RB (f) | 4.75% | 07/01/2024 | 1,730 | 1,720,433 | ||
| La Vernia Higher Education Finance Corp. (Meridian World School); Series 2015 A, RB (e) | 5.50% | 08/15/2045 | 1,330 | 1,356,839 | ||
| Lower Colorado River Authority; | ||||||
| Series 2012 A, Ref. RB (h)(i) | 5.00% | 05/15/2022 | 5 | 5,455 | ||
| Series 2012 A, Ref. RB | 5.00% | 05/15/2030 | 2,335 | 2,534,572 | ||
| Lower Colorado River Authority (LCRA Transmission Services Corp.); | ||||||
| Series 2011 A, Ref. RB | 5.00% | 05/15/2041 | 1,400 | 1,451,870 | ||
| Series 2019, Ref. RB | 5.00% | 05/15/2038 | 1,250 | 1,522,700 | ||
| Mission Economic Development Corp. (Natgasoline); Series 2018, Ref. RB (e)(f) | 4.63% | 10/01/2031 | 3,085 | 3,114,338 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Texas–(continued) | ||||||
| New Hope Cultural Education Facilities Corp. (Presbyterian Village North); | ||||||
| Series 2018, Ref. RB | 5.00% | 10/01/2031 | $ 560 | $ 508,805 | ||
| Series 2018, Ref. RB | 5.00% | 10/01/2032 | 1,015 | 906,953 | ||
| New Hope Cultural Education Facilities Finance Corp. (4-K Housing, Inc.-Stoney Brook); Series 2017 B, RB | 5.00% | 07/01/2052 | 1,500 | 954,315 | ||
| New Hope Cultural Education Facilities Finance Corp. (Carillon Lifecare Community); | ||||||
| Series 2016, Ref. RB | 5.00% | 07/01/2036 | 650 | 555,906 | ||
| Series 2016, Ref. RB | 5.00% | 07/01/2046 | 350 | 275,303 | ||
| New Hope Cultural Education Facilities Finance Corp. (CHF-Collegiate Housing College Station I, LLC-Texas A&M University); Series 2014 A, RB (INS - AGM)(b) | 5.00% | 04/01/2046 | 2,010 | 2,162,137 | ||
| New Hope Cultural Education Facilities Finance Corp. (Longhorn Village); | ||||||
| Series 2017, Ref. RB | 5.00% | 01/01/2042 | 495 | 441,550 | ||
| Series 2017, Ref. RB | 5.00% | 01/01/2047 | 620 | 543,306 | ||
| North Texas Tollway Authority; | ||||||
| Series 2008 I, Ref. RB (INS - AGC)(b)(j) | 6.20% | 01/01/2042 | 1,000 | 1,192,490 | ||
| Series 2011 A, RB (d) | 5.50% | 09/01/2036 | 2,895 | 3,084,130 | ||
| Series 2015 B, Ref. RB (d)(k) | 5.00% | 01/01/2040 | 9,860 | 10,621,192 | ||
| San Antonio (City of), TX; Series 2013, RB | 5.00% | 02/01/2038 | 2,795 | 3,083,137 | ||
| Tarrant County Cultural Education Facilities Finance Corp.; Series 2016 A, Ref. RB (d) | 5.00% | 02/15/2047 | 3,455 | 4,007,765 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (Air Force Village Obligated Group); | ||||||
| Series 2016, Ref. RB | 5.00% | 05/15/2037 | 2,295 | 2,179,171 | ||
| Series 2016, Ref. RB | 5.00% | 05/15/2045 | 1,660 | 1,498,084 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (Buckingham Senior Living Community, Inc.); | ||||||
| Series 2007, RB (c) | 5.63% | 11/15/2027 | 1,000 | 700,000 | ||
| Series 2007, RB (c) | 5.75% | 12/31/2049 | 550 | 385,000 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (C.C. Young Memorial Home); | ||||||
| Series 2007, RB | 5.75% | 02/15/2025 | 305 | 295,466 | ||
| Series 2017A, RB | 6.38% | 02/15/2048 | 1,940 | 1,684,560 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (Texas Health Resources System); Series 2016 A, Ref. RB | 5.00% | 02/15/2041 | 4,225 | 4,952,756 | ||
| Texas (State of) Transportation Commission; | ||||||
| Series 2016 A, GO Bonds | 5.00% | 04/01/2044 | 1,695 | 2,035,695 | ||
| Series 2019, RB (g) | 0.00% | 08/01/2043 | 3,000 | 1,032,870 | ||
| Texas (State of) Transportation Commission (Central Texas Turnpike System); | ||||||
| Series 2012 A, Ref. RB (h)(i) | 5.00% | 08/15/2022 | 4,130 | 4,568,400 | ||
| Series 2015 B, Ref. RB (g) | 0.00% | 08/15/2036 | 3,475 | 1,800,537 | ||
| Series 2015 B, Ref. RB (g) | 0.00% | 08/15/2037 | 1,175 | 580,908 | ||
| Series 2015 C, Ref. RB | 5.00% | 08/15/2042 | 5,335 | 5,610,873 | ||
| Texas (State of) Water Development Board; Series 2017 A, RB | 4.00% | 10/15/2035 | 280 | 331,694 | ||
| Texas Municipal Gas Acquisition & Supply Corp. I; Series 2008 D, RB | 6.25% | 12/15/2026 | 4,985 | 5,730,457 | ||
| Texas Municipal Gas Acquisition & Supply Corp. III; | ||||||
| Series 2012, RB | 5.00% | 12/15/2027 | 1,500 | 1,591,215 | ||
| Series 2012, RB | 5.00% | 12/15/2028 | 1,475 | 1,561,479 | ||
| Series 2012, RB | 5.00% | 12/15/2030 | 1,500 | 1,582,995 | ||
| Series 2012, RB | 5.00% | 12/15/2031 | 4,475 | 4,711,638 | ||
| Series 2012, RB | 5.00% | 12/15/2032 | 1,000 | 1,049,230 | ||
| Texas Private Activity Bond Surface Transportation Corp. (Blueridge Transportation Group, LLC SH 288 Toll Lanes); Series 2016, RB (f) | 5.00% | 12/31/2055 | 1,140 | 1,151,560 | ||
| Texas Private Activity Bond Surface Transportation Corp. (LBJ Infrastructure); Series 2010, RB | 7.00% | 06/30/2040 | 870 | 874,367 | ||
| Texas Private Activity Bond Surface Transportation Corp. (NTE Mobility Partners Segments 3 LLC Segments 3A and 3B Facility); Series 2013, RB (f) | 7.00% | 12/31/2038 | 1,475 | 1,674,774 | ||
| Texas Private Activity Bond Surface Transportation Corp. (Segment 3C); Series 2019, RB (f) | 5.00% | 06/30/2058 | 2,385 | 2,626,028 | ||
| Travis County Cultural Education Facilities Finance Corp. (Wayside Schools); Series 2012 A, RB | 5.25% | 08/15/2042 | 545 | 546,531 | ||
| 104,203,003 | ||||||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Utah–1.42% | ||||||
| Salt Lake (City of), UT; | ||||||
| Series 2017 A, RB (d)(f) | 5.00% | 07/01/2047 | $ 2,705 | $ 3,033,576 | ||
| Series 2018 A, RB (f) | 5.00% | 07/01/2048 | 1,305 | 1,481,605 | ||
| Series 2018 A, RB (f) | 5.25% | 07/01/2048 | 1,735 | 2,000,594 | ||
| Utah (County of), UT; Series 2016 B, RB (d) | 4.00% | 05/15/2047 | 3,300 | 3,546,279 | ||
| 10,062,054 | ||||||
| Virgin Islands–0.49% | ||||||
| Virgin Islands (Government of) Public Finance Authority (Matching Fund Loan Note - Diageo); Series 2009 A, RB | 6.63% | 10/01/2029 | 725 | 634,556 | ||
| Virgin Islands (Government of) Public Finance Authority (Matching Fund Loan Note); | ||||||
| Series 2009 B, Ref. RB | 5.00% | 10/01/2025 | 1,500 | 1,417,005 | ||
| Series 2010 A, RB | 5.00% | 10/01/2025 | 425 | 401,485 | ||
| Series 2010 A, RB | 5.00% | 10/01/2029 | 1,095 | 1,022,544 | ||
| 3,475,590 | ||||||
| Virginia–2.30% | ||||||
| Roanoke (City of), VA Economic Development Authority (Carilion Clinic Obligated Group); Series 2020, Ref. RB | 5.00% | 07/01/2047 | 1,255 | 1,926,011 | ||
| Roanoke (City of), VA Economic Development Authority (Richfield Living); Series 2020, RB | 5.00% | 09/01/2050 | 325 | 273,146 | ||
| Virginia (State of) Commonwealth Transportation Board; Series 2017, RB | 4.00% | 05/15/2042 | 1,320 | 1,505,249 | ||
| Virginia (State of) Small Business Financing Authority (95 Express Lanes LLC); Series 2019, RB (f) | 5.00% | 01/01/2044 | 1,985 | 2,022,973 | ||
| Virginia (State of) Small Business Financing Authority (95 Express Lanes, LLC); Series 2017, RB (f) | 5.00% | 01/01/2040 | 370 | 377,363 | ||
| Virginia (State of) Small Business Financing Authority (Elizabeth River Crossings Opco, LLC); | ||||||
| Series 2012, RB (f) | 6.00% | 01/01/2037 | 795 | 831,149 | ||
| Series 2012, RB (f) | 5.50% | 01/01/2042 | 2,950 | 3,040,830 | ||
| Virginia (State of) Small Business Financing Authority (Express Lanes, LLC); Series 2012, RB (f) | 5.00% | 07/01/2034 | 3,320 | 3,389,155 | ||
| Virginia (State of) Small Business Financing Authority (Transform 66 P3); Series 2017, RB (f) | 5.00% | 12/31/2052 | 1,900 | 1,988,616 | ||
| Virginia (State of) Small Business Financing Authority (Transform 66); Series 2017, RB (f) | 5.00% | 12/31/2049 | 910 | 955,282 | ||
| 16,309,774 | ||||||
| Washington–4.31% | ||||||
| Bellevue (City of), WA Convention Center Authority (Compound Interest); Series 1994, Ref. RB (INS - NATL)(b)(g) | 0.00% | 02/01/2024 | 5,000 | 4,741,600 | ||
| Chelan (County of), WA Public Utility District No. 1; Series 2011 A, Ref. RB (f) | 5.50% | 07/01/2026 | 1,525 | 1,603,949 | ||
| Energy Northwest (Columbia Generating Station); Series 2020 A, Ref. RB | 4.00% | 07/01/2039 | 1,535 | 1,852,684 | ||
| Kalispel Tribe of Indians; Series 2018 A, RB (e) | 5.25% | 01/01/2038 | 1,320 | 1,386,396 | ||
| Washington (State of); Series 2019 A, GO Bonds (d) | 5.00% | 08/01/2042 | 1,875 | 2,361,675 | ||
| Washington (State of) (SR 520 Corridor Program –Toll Revenue); Series 2011 C, GO Bonds (d) | 5.00% | 06/01/2033 | 1,500 | 1,560,915 | ||
| Washington (State of) Convention Center Public Facilities District; | ||||||
| Series 2018, RB | 5.00% | 07/01/2043 | 1,175 | 1,266,204 | ||
| Series 2018, RB (d)(k) | 5.00% | 07/01/2048 | 4,190 | 4,502,490 | ||
| Series 2018, RB | 5.00% | 07/01/2048 | 840 | 890,694 | ||
| Washington (State of) Health Care Facilities Authority; Series 2019 A-2, Ref. RB (d)(k) | 5.00% | 08/01/2044 | 3,635 | 4,071,927 | ||
| Washington (State of) Health Care Facilities Authority (Catholic Health Initiatives); Series 2011 A, RB (d) | 5.00% | 02/01/2041 | 2,325 | 2,398,214 | ||
| Washington (State of) Health Care Facilities Authority (Swedish Health Services); Series 2011 A, RB (h)(i) | 6.25% | 05/15/2021 | 1,025 | 1,083,794 | ||
| Washington (State of) Higher Education Facilities Authority (Whitworth University); Series 2012, RB | 5.25% | 10/01/2046 | 1,250 | 1,291,962 | ||
| Washington (State of) Tobacco Settlement Authority; | ||||||
| Series 2013, Ref. RB | 5.25% | 06/01/2031 | 595 | 595,357 | ||
| Series 2013, Ref. RB | 5.25% | 06/01/2033 | 1,000 | 1,026,210 | ||
| 30,634,071 | ||||||
| West Virginia–0.21% | ||||||
| Monongalia (County of), WV Commission Special District (University Town Centre Economic Opportunity Development District); Series 2020, Ref. RB (e) | 7.50% | 06/01/2043 | 830 | 816,703 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| West Virginia–(continued) | ||||||
| West Virginia (State of) Hospital Finance Authority (Thomas Health System); | ||||||
| Series 2008, RB (c) | 6.00% | 10/01/2020 | $ 475 | $ 213,750 | ||
| Series 2008, RB (c) | 6.25% | 10/01/2023 | 1,100 | 495,000 | ||
| 1,525,453 | ||||||
| Wisconsin–2.25% | ||||||
| Public Finance Authority (American Dream at Meadowlands); | ||||||
| Series 2017, RB (e) | 6.75% | 08/01/2031 | 915 | 792,555 | ||
| Series 2017, RB (e) | 6.75% | 12/01/2042 | 2,135 | 1,862,510 | ||
| Public Finance Authority (KU Campus Development Corp.); Series 2016, RB (d) | 5.00% | 03/01/2046 | 3,735 | 4,267,088 | ||
| Public Finance Authority (Mallard Creek Stem Academy); Series 2019 A, RB (e) | 5.13% | 06/15/2039 | 625 | 556,912 | ||
| Superior (City of), WI (Superior Water, Light & Power Co.); | ||||||
| Series 2007 A, Ref. RB (f) | 5.38% | 11/01/2021 | 450 | 451,724 | ||
| Series 2007 B, RB (f) | 5.75% | 11/01/2037 | 410 | 411,587 | ||
| Wisconsin (State of) Health & Educational Facilities Authority (Ascension Health Alliance); Series 2013, RB | 4.00% | 11/15/2043 | 2,375 | 2,645,892 | ||
| Wisconsin (State of) Public Finance Authority (Maryland Proton Treatment Center); Series 2018 A-1, RB (e) | 6.38% | 01/01/2048 | 650 | 536,250 | ||
| Wisconsin (State of) Public Finance Authority (Prime Healthcare Foundation, Inc.); | ||||||
| Series 2018 A, RB | 5.20% | 12/01/2037 | 1,675 | 1,772,435 | ||
| Series 2018 A, RB | 5.35% | 12/01/2045 | 1,675 | 1,765,500 | ||
| Wisconsin (State of) Public Finance Authority (Roseman University of Health Sciences); Series 2015, Ref. RB | 5.75% | 04/01/2035 | 875 | 901,276 | ||
| 15,963,729 | ||||||
| Wyoming–0.37% | ||||||
| Wyoming (State of) Municipal Power Agency; Series 2017 A, Ref. RB (INS - BAM)(b)(d) | 5.00% | 01/01/2047 | 2,205 | 2,611,977 | ||
| TOTAL INVESTMENTS IN SECURITIES(p)–164.83% (Cost $1,118,539,746) | 1,170,833,392 | |||||
| FLOATING RATE NOTE OBLIGATIONS–(28.65)% | ||||||
| Notes with interest and fee rates ranging from 0.52% to 1.21% at 05/31/2020 and contractual maturities of collateral ranging from 09/01/2022 to 04/01/2056(q) | (203,485,000) | |||||
| VARIABLE RATE MUNI TERM PREFERRED SHARES–(37.00)% | (262,795,217) | |||||
| OTHER ASSETS LESS LIABILITIES–0.82% | 5,753,161 | |||||
| NET ASSETS APPLICABLE TO COMMON SHARES–100.00% | $710,306,336 | |||||
| ACA | – ACA Financial Guaranty Corp. |
| AGC | – Assured Guaranty Corp. |
| AGM | – Assured Guaranty Municipal Corp. |
| AMBAC | – American Municipal Bond Assurance Corp. |
| BAM | – Build America Mutual Assurance Co. |
| BHAC | – Berkshire Hathaway Assurance Corp. |
| CEP | – Credit Enhancement Provider |
| COP | – Certificates of Participation |
| Ctfs. | – Certificates |
| GNMA | – Government National Mortgage Association |
| GO | – General Obligation |
| IDR | – Industrial Development Revenue Bonds |
| INS | – Insurer |
| NATL | – National Public Finance Guarantee Corp. |
| PCR | – Pollution Control Revenue Bonds |
| RAC | – Revenue Anticipation Certificates |
| RB | – Revenue Bonds |
| Ref. | – Refunding |
| RN | – Revenue Notes |
| SIFMA | – Securities Industry and Financial Markets Association |
| (a) | Calculated as a percentage of net assets. Amounts in excess of 100% are due to the Trust’s use of leverage. |
| (b) | Principal and/or interest payments are secured by the bond insurance company listed. |
| (c) | Defaulted security. Currently, the issuer is in default with respect to principal and/or interest payments. The aggregate value of these securities at May 31, 2020 was $5,321,838, which represented less than 1% of the Trust’s Net Assets. |
| (d) | Underlying security related to TOB Trusts entered into by the Trust. |
| (e) | Security purchased or received in a transaction exempt from registration under the Securities Act of 1933, as amended (the “1933 Act”). The security may be resold pursuant to an exemption from registration under the 1933 Act, typically to qualified institutional buyers. The aggregate value of these securities at May 31, 2020 was $36,909,781, which represented 5.20% of the Trust’s Net Assets. |
| (f) | Security subject to the alternative minimum tax. |
| (g) | Zero coupon bond issued at a discount. |
| (h) | Advance refunded; secured by an escrow fund of U.S. Government obligations or other highly rated collateral. |
| (i) | Security has an irrevocable call by the issuer or mandatory put by the holder. Maturity date reflects such call or put. |
| (j) | Convertible capital appreciation bond. The interest rate shown represents the coupon rate at which the bond will accrue at a specified future date. |
| (k) | Security is subject to a reimbursement agreement which may require the Trust to pay amounts to a counterparty in the event of a significant decline in the market value of the security underlying the TOB Trusts. In case of a shortfall, the maximum potential amount of payments the Trust could ultimately be required to make under the agreement is $35,636,000. However, such shortfall payment would be reduced by the proceeds from the sale of the security underlying the TOB Trusts. |
| (l) | Interest or dividend rate is redetermined periodically. Rate shown is the rate in effect on May 31, 2020. |
| (m) | Security valued using significant unobservable inputs (Level 3). See Note 1. |
| (n) | The issuer is paying less than stated interest, but is not in default on principal because scheduled principal payments have not yet begun. |
| (o) | Security subject to crossover refunding. |
| (p) | Entities may either issue, guarantee, back or otherwise enhance the credit quality of a security. The entities are not primarily responsible for the issuer’s obligation but may be called upon to satisfy issuer’s obligations. No concentration of any single entity was greater than 5% each. |
| (q) | Floating rate note obligations related to securities held. The interest and fee rates shown reflect the rates in effect at May 31, 2020. At May 31, 2020, the Trust’s investments with a value of $325,021,032 are held by TOB Trusts and serve as collateral for the $203,485,000 in the floating rate note obligations outstanding at that date. |
| Open Futures Contracts(a) | |||||
| Short Futures Contracts | Number of Contracts | Expiration Month | Notional Value | Value | Unrealized Appreciation (Depreciation) |
| Interest Rate Risk | |||||
| U.S. Treasury 10 Year Notes | 107 | September-2020 | $(14,879,688) | $(20,063) | $(20,063) |
| (a) | Futures contracts collateralized by $390,000 cash held with Goldman Sachs & Co., the futures commission merchant. |
| Level 1 | Level 2 | Level 3 | Total | |
| Investments in Securities | ||||
| Municipal Obligations | $— | $1,169,984,454 | $848,938 | $1,170,833,392 |
| Other Investments - Assets* | ||||
| Investments Matured | — | — | 147,300 | 147,300 |
| Other Investments - Liabilities* | ||||
| Futures Contracts | (20,063) | — | — | (20,063) |
| Total Investments | $(20,063) | $1,169,984,454 | $996,238 | $1,170,960,629 |
| * | Futures contracts are valued at unrealized appreciation (depreciation). Investments matured are shown at value. |