| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Municipal Obligations–163.27%(a) | ||||||
| Alabama–2.32% | ||||||
| Alabama (State of) Special Care Facilities Financing Authority (Ascension Health Senior Credit Group); Series 2016 B, Ref. RB | 5.00% | 11/15/2046 | $ 3,630 | $ 4,325,960 | ||
| Birmingham (City of), AL Special Care Facilities Financing Authority (Methodist Home for the Aging); Series 2016, RB | 5.75% | 06/01/2045 | 185 | 194,150 | ||
| Birmingham (City of), AL Water Works Board; Series 2016 B, Ref. RB | 5.00% | 01/01/2043 | 940 | 1,147,134 | ||
| Huntsville (City of), AL Special Care Facilities Financing Authority (Redstone Village); Series 2007, RB(b) | 5.50% | 01/01/2043 | 1,900 | 1,303,664 | ||
| Lower Alabama Gas District (The); | ||||||
| Series 2016 A, RB | 5.00% | 09/01/2046 | 1,195 | 1,819,707 | ||
| Series 2016 A, RB(c) | 5.00% | 09/01/2046 | 2,100 | 3,197,812 | ||
| Tuscaloosa (County of), AL Industrial Development Authority (Hunt Refining); Series 2019 A, Ref. IDR(d) | 5.25% | 05/01/2044 | 615 | 707,147 | ||
| 12,695,574 | ||||||
| Alaska–0.64% | ||||||
| Alaska (State of) Industrial Development & Export Authority (Providence Health Services); Series 2011 A, RB(c) | 5.50% | 10/01/2041 | 3,465 | 3,518,217 | ||
| Arizona–3.78% | ||||||
| Arizona (State of) Health Facilities Authority (Scottsdale Lincoln Hospital); Series 2014, Ref. RB | 5.00% | 12/01/2042 | 1,645 | 1,874,495 | ||
| Arizona (State of) Industrial Development Authority; | ||||||
| Series 2019 A-2, RB | 3.63% | 05/20/2033 | 812 | 924,133 | ||
| Series 2020 A, RB(d) | 5.00% | 12/15/2050 | 300 | 343,681 | ||
| Arizona (State of) Industrial Development Authority (Great Laked Senior Living Community); | ||||||
| Series 2019 A, RB | 5.00% | 01/01/2038 | 1,200 | 1,247,647 | ||
| Series 2019 B, RB | 5.13% | 01/01/2054 | 60 | 58,833 | ||
| Arizona (State of) Industrial Development Authority (Leman Academy of Excellence); Series 2017 A, Ref. RB(d) | 5.25% | 07/01/2047 | 870 | 897,365 | ||
| Glendale (City of), AZ Industrial Development Authority (The Beatitudes Campus); | ||||||
| Series 2017, Ref. RB | 5.00% | 11/15/2030 | 1,000 | 1,092,537 | ||
| Series 2017, Ref. RB | 5.00% | 11/15/2045 | 665 | 710,346 | ||
| Maricopa (County of), AZ Industrial Development Authority (Legacy Traditional Schools); Series 2019, Ref. RB(d) | 5.00% | 07/01/2054 | 165 | 189,797 | ||
| Phoenix (City of), AZ Industrial Development Authority (Legacy Traditional Schools); Series 2014 A, RB(d) | 6.50% | 07/01/2034 | 380 | 440,977 | ||
| Phoenix (City of), AZ Industrial Development Authority (Rowan University); Series 2012, RB | 5.00% | 06/01/2042 | 2,340 | 2,440,011 | ||
| Phoenix Civic Improvement Corp.; | ||||||
| Series 2017 A, RB(e) | 5.00% | 07/01/2042 | 1,160 | 1,398,524 | ||
| Series 2017 A, RB(e) | 5.00% | 07/01/2047 | 1,855 | 2,236,972 | ||
| Series 2020, RB(c) | 5.00% | 07/01/2049 | 2,250 | 2,804,528 | ||
| Series 2020-XM0924, RB(c) | 5.00% | 07/01/2044 | 1,495 | 1,940,368 | ||
| Pima (County of), AZ Industrial Development Authority (American Leadership Academy); Series 2019, Ref. RB(d) | 5.00% | 06/15/2052 | 270 | 286,894 | ||
| Pima (County of), AZ Industrial Development Authority (Grande Innovations Academy); Series 2018, RB(d) | 5.38% | 07/01/2052 | 885 | 931,711 | ||
| Salt Verde Financial Corp.; Series 2007, RB | 5.00% | 12/01/2037 | 600 | 845,809 | ||
| 20,664,628 | ||||||
| Arkansas–0.12% | ||||||
| Arkansas (State of) Development Finance Authority (Baptist Memorial Health); Series 2020, Ref. RB | 5.00% | 09/01/2039 | 500 | 628,274 | ||
| California–18.01% | ||||||
| Anaheim (City of), CA Public Financing Authority (Anaheim Public Improvements); Series 1997 C, RB (INS - AGM)(f)(g) | 0.00% | 09/01/2021 | 7,265 | 7,259,022 | ||
| Bay Area Toll Authority (San Francisco Bay Area); Series 2017 F-1, RB(c)(h)(i)(j) | 5.00% | 04/01/2027 | 1,890 | 2,365,769 | ||
| Beverly Hills Unified School District (Election of 2008); Series 2009, GO Bonds(g) | 0.00% | 08/01/2028 | 900 | 837,911 | ||
| California (County of), CA Tobacco Securitization Agency; Series 2020 A, Ref. RB | 4.00% | 06/01/2037 | 275 | 333,611 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | ||
| California–(continued) | |||||
| California (County of), CA Tobacco Securitization Agency (Alameda County Tobacco Asset Securitization Corp.); Series 2006 C, RB(g) | 0.00% | 06/01/2055 | $ 8,390 | $ 675,570 | |
| California (County of), CA Tobacco Securitization Agency (Los Angeles County Securitization Corp.); | |||||
| Series 2020 B-1, Ref. RB | 5.00% | 06/01/2049 | 100 | 123,570 | |
| Series 2020 B-2, Ref. RB(g) | 0.00% | 06/01/2055 | 1,245 | 247,327 | |
| California (State of); | |||||
| Series 2012, GO Bonds | 5.25% | 04/01/2035 | 2,805 | 2,923,127 | |
| Series 2012, GO Bonds | 5.00% | 04/01/2042 | 2,060 | 2,140,539 | |
| Series 2012, Ref. GO Bonds | 5.25% | 02/01/2030 | 2,220 | 2,295,349 | |
| Series 2013, GO Bonds | 5.00% | 04/01/2037 | 1,350 | 1,463,973 | |
| Series 2013, Ref. GO Bonds | 5.25% | 09/01/2030 | 2,000 | 2,223,376 | |
| Series 2020-XM0909, GO Bonds(c) | 3.00% | 11/01/2050 | 1,750 | 1,882,465 | |
| Series 2020-XX1123, Ctfs.(c)(j) | 4.00% | 03/01/2046 | 2,245 | 2,670,701 | |
| California (State of) Community Housing Agency (Annadel Apartments); Series 2019 A, RB(d) | 5.00% | 04/01/2049 | 625 | 714,281 | |
| California (State of) Housing Finance Agency; | |||||
| Series 2019 A-2, RB | 4.00% | 03/20/2033 | 367 | 433,422 | |
| Series 2021-1, Class A, Ctfs. | 3.50% | 11/20/2035 | 623 | 731,083 | |
| California (State of) Municipal Finance Authority (Bella Mente Montessori Academy); Series 2018 A, RB(d) | 5.00% | 06/01/2048 | 145 | 163,080 | |
| California (State of) Municipal Finance Authority (CHF-Davis I, LLC - West Village Student Housing); Series 2018, RB | 5.00% | 05/15/2035 | 940 | 1,151,846 | |
| California (State of) Municipal Finance Authority (Green Bonds); Series 2021, RB (INS -BAM)(f) | 4.00% | 05/15/2039 | 500 | 601,514 | |
| California (State of) Municipal Finance Authority (Linxs APM); | |||||
| Series 2018 A, RB(e) | 5.00% | 12/31/2038 | 1,110 | 1,356,263 | |
| Series 2018 A, RB(e) | 5.00% | 12/31/2043 | 1,500 | 1,825,813 | |
| California (State of) Municipal Finance Authority (United Airlines, Inc.); Series 2019, Ref. RB(e) | 4.00% | 07/15/2029 | 1,240 | 1,439,285 | |
| California (State of) Municipal Finance Authority (William Jessup University); Series 2019, Ref. RB | 5.00% | 08/01/2039 | 185 | 209,176 | |
| California (State of) Pollution Control Finance Authority; | |||||
| Series 2012, RB(d)(e) | 5.00% | 07/01/2027 | 1,005 | 1,079,617 | |
| Series 2012, RB(d)(e) | 5.00% | 07/01/2030 | 1,215 | 1,304,019 | |
| Series 2012, RB(d)(e) | 5.00% | 07/01/2037 | 2,685 | 2,837,201 | |
| California (State of) Statewide Communities Development Authority (Loma Linda University Medical Center); | |||||
| Series 2014, RB | 5.25% | 12/01/2044 | 655 | 743,780 | |
| Series 2016 A, RB(d) | 5.00% | 12/01/2041 | 1,030 | 1,164,010 | |
| Series 2016 A, RB(d) | 5.25% | 12/01/2056 | 750 | 846,478 | |
| California State University; Series 2020-XM0923, RB(c) | 5.00% | 11/01/2048 | 1,545 | 1,936,840 | |
| CSCDA Community Improvement Authority; Series 2021, RB(d) | 4.00% | 08/01/2056 | 375 | 408,173 | |
| CSCDA Community Improvement Authority (Jefferson-Anaheim Social Bonds); Series 2021-A, RB(d) | 3.13% | 08/01/2056 | 625 | 622,996 | |
| CSCDA Community Improvement Authority (Social Bonds); Series 2021 A-2, RB(d) | 4.00% | 09/01/2056 | 625 | 688,227 | |
| Daly City (City of), CA Housing Development Finance Agency (Franciscan Mobile Home Park Acquisition); Series 2007 C, Ref. RB | 6.50% | 12/15/2047 | 385 | 385,625 | |
| Foothill-Eastern Transportation Corridor Agency; Series 2015, Ref. RB (INS - AGM)(f)(g) | 0.00% | 01/15/2034 | 3,145 | 2,386,717 | |
| Golden State Tobacco Securitization Corp.; | |||||
| Series 2013 A, RB | 5.00% | 06/01/2030 | 1,050 | 1,142,237 | |
| Series 2015, Ref. RB(h)(i) | 5.00% | 06/01/2025 | 1,650 | 1,947,797 | |
| Series 2015, Ref. RB | 5.00% | 06/01/2040 | 1,350 | 1,572,546 | |
| Series 2018 A-1, Ref. RB | 5.00% | 06/01/2035 | 1,015 | 1,224,679 | |
| Series 2018 A-1, Ref. RB | 5.00% | 06/01/2047 | 875 | 906,175 | |
| Long Beach (City of), CA; Series 2020-XM0865, Ctfs.(c) | 7.15% | 05/15/2044 | 1,495 | 1,895,173 | |
| Los Angeles (City of), CA Department of Water & Power; Series 2012 B, RB | 5.00% | 07/01/2037 | 1,200 | 1,261,909 | |
| M-S-R Energy Authority; | |||||
| Series 2009 B, RB | 7.00% | 11/01/2034 | 435 | 688,252 | |
| Series 2009 B, RB | 6.50% | 11/01/2039 | 1,660 | 2,736,741 | |
| Mt. San Antonio Community College District (Election of 2008); Series 2013 A, GO Bonds(k) | 6.25% | 08/01/2043 | 1,500 | 1,702,893 | |
| Oakland (Port of), CA; Series 2012 P, Ref. RB(e)(h)(i) | 5.00% | 05/01/2022 | 2,730 | 2,850,872 | |
| Riverside County Asset Leasing Corp. (Riverside County Hospital); Series 1997, RB (INS - NATL)(f)(g) | 0.00% | 06/01/2021 | 9,000 | 9,000,000 | |
| San Buenaventura (City of), CA (Community Memorial Health System); Series 2011, RB(h)(i) | 7.50% | 12/01/2021 | 1,655 | 1,714,330 | |
| San Diego (City of), CA Community College District (Election of 2006); Series 2011, GO Bonds(h)(i) | 5.00% | 08/01/2021 | 4,490 | 4,526,492 | |
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| California–(continued) | ||||||
| San Francisco (City & County of), CA Airport Commission (San Francisco International Airport); | ||||||
| Series 2019 A, Ref. RB(e) | 5.00% | 05/01/2036 | $ 875 | $ 1,099,041 | ||
| Series 2019 A, Ref. RB(e) | 5.00% | 05/01/2039 | 1,760 | 2,194,954 | ||
| San Francisco (City & County of), CA Public Utilities Commission (Water System Improvement Program); Subseries 2011 A, RB(c)(h)(i) | 5.00% | 11/01/2021 | 3,690 | 3,765,737 | ||
| Santa Margarita Water District (Community Facilities District No. 2013-1); Series 2013, RB | 5.50% | 09/01/2032 | 505 | 550,744 | ||
| Silicon Valley Tobacco Securitization Authority (Santa Clara); Series 2007 A, RB(g) | 0.00% | 06/01/2041 | 2,605 | 850,352 | ||
| University of California; | ||||||
| Series 2018 AZ, Ref. RB(c) | 4.00% | 05/15/2048 | 1,780 | 2,056,222 | ||
| Series 2020 BE, Ref. RB | 4.00% | 05/15/2047 | 1,740 | 2,069,758 | ||
| Series 2021-XF1212, Revenue Ctfs.(c) | 4.00% | 05/15/2051 | 1,905 | 2,282,343 | ||
| 98,511,003 | ||||||
| Colorado–3.02% | ||||||
| Arkansas (State of) River Power Authority; Series 2006, RB(h) | 5.88% | 10/01/2026 | 925 | 1,077,076 | ||
| Belford North Metropolitan District; Series 2020 A, GO Bonds | 5.50% | 12/01/2050 | 780 | 856,269 | ||
| Colorado (State of) Health Facilities Authority (Commonspirit Health); Series 2019 A-2, Ref. RB | 4.00% | 08/01/2049 | 1,245 | 1,410,486 | ||
| Colorado (State of) Health Facilities Authority (Evangelical Lutheran Good Samaritan Society (The)); Series 2017, Ref. RB(h)(i) | 5.00% | 06/01/2027 | 435 | 540,334 | ||
| Colorado (State of) Health Facilities Authority (Volunteers of America Care); Series 2007 A, RB | 5.30% | 07/01/2037 | 690 | 679,700 | ||
| Colorado (State of) Science and Technology Park Metropolitan District No. 1; Series 2018, Ref. RB | 5.00% | 12/01/2033 | 500 | 542,411 | ||
| Colorado Crossing Metropolitan District No. 2; Series 2020 A-1, Ref. GO Bonds | 5.00% | 12/01/2047 | 500 | 542,039 | ||
| Colorado Health Facilities Authority; Series 2020-XX1130, Ctfs.(c)(j) | 5.00% | 08/01/2044 | 935 | 1,156,068 | ||
| Denver (City & County of), CO; | ||||||
| Series 2012 B, RB(h)(i) | 5.00% | 11/15/2022 | 1,400 | 1,498,711 | ||
| Series 2018 A, Ref. RB(c)(e) | 5.25% | 12/01/2048 | 1,315 | 1,625,657 | ||
| Series 2018 A-2, RB(g) | 0.00% | 08/01/2034 | 1,270 | 851,524 | ||
| Great Western Metropolitan District; Series 2020, Ref. GO Bonds | 4.75% | 12/01/2050 | 340 | 371,107 | ||
| Jefferson (County of), CO Center Metropolitan District No. 1; Series 2020 B, Ref. RB | 5.75% | 12/15/2050 | 675 | 728,968 | ||
| Neu Towne Metropolitan District; Series 2018 A, Ref. GO Bonds | 5.38% | 12/01/2046 | 530 | 570,273 | ||
| North Range Metropolitan District No. 3; Series 2020 A, GO Bonds | 5.00% | 12/01/2040 | 500 | 556,253 | ||
| Public Authority for Colorado Energy; Series 2008, RB | 6.50% | 11/15/2038 | 1,500 | 2,341,632 | ||
| Village Metropolitan District (The); Series 2020, Ref. GO Bonds | 5.00% | 12/01/2040 | 550 | 623,407 | ||
| White Buffalo Metropolitan District No. 3; Series 2020, GO Bonds | 5.50% | 12/01/2050 | 500 | 550,851 | ||
| 16,522,766 | ||||||
| District of Columbia–1.31% | ||||||
| District of Columbia (Provident Group - Howard Properties LLC); Series 2013, RB | 5.00% | 10/01/2045 | 515 | 534,065 | ||
| Metropolitan Washington Airports Authority (Dulles Metrorail and Capital Improvement); | ||||||
| Series 2014 A, Ref. RB | 5.00% | 10/01/2053 | 5,005 | 5,177,362 | ||
| Series 2019 B, Ref. RB | 4.00% | 10/01/2049 | 1,245 | 1,425,528 | ||
| 7,136,955 | ||||||
| Florida–9.84% | ||||||
| Alachua (County of), FL Health Facilities Authority (Shands Teaching Hospital & Clinics); Series 2019, RB | 4.00% | 12/01/2049 | 370 | 426,738 | ||
| Alachua (County of), FL Health Facilities Authority (Terraces at Bonita Springs); Series 2011 A, RB | 8.13% | 11/15/2041 | 1,000 | 1,001,818 | ||
| Broward (County of), FL; | ||||||
| Series 2012 A, RB(h)(i) | 5.00% | 10/01/2022 | 2,460 | 2,620,577 | ||
| Series 2013 C, RB(h)(i) | 5.25% | 10/01/2023 | 1,900 | 2,123,927 | ||
| Series 2015 A, RB(e) | 5.00% | 10/01/2045 | 1,075 | 1,242,194 | ||
| Series 2017, RB(c)(e)(j) | 5.00% | 10/01/2047 | 1,935 | 2,344,778 | ||
| Series 2019 B, RB(e) | 4.00% | 09/01/2044 | 625 | 721,806 | ||
| Cape Coral (City of), FL Health Facilities Authority (Gulf Care, Inc.); Series 2015, Ref. RB(d) | 6.00% | 07/01/2045 | 190 | 203,799 | ||
| Central Florida Expressway Authority; Series 2020-XX1136, Ctfs.(c)(j) | 5.00% | 07/01/2049 | 1,775 | 2,220,056 | ||
| Collier (County of), FL Industrial Development Authority (The Arlington of Naples); Series 2014 A, RB (Acquired 12/16/2013; Cost $976,983)(b)(d)(l) | 7.75% | 05/15/2035 | 1,000 | 680,000 | ||
| County of Miami-Dade FL Water & Sewer System Revenue; Series 2021-XM0942, Revenue Ctfs.(c) | 4.00% | 10/01/2046 | 2,225 | 2,675,361 | ||
| Davie (Town of), FL (Nova Southeastern University); Series 2013 A, RB(h)(i) | 6.00% | 04/01/2023 | 1,100 | 1,216,729 | ||
| Florida (State of) North Broward Hospital District; Series 2017 B, Ref. RB | 5.00% | 01/01/2048 | 2,255 | 2,637,470 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Florida–(continued) | ||||||
| Florida (State of) Ports Financing Commission (State Transportation Trust Fund); Series 2011 B, Ref. RB(e)(h)(i) | 5.13% | 06/01/2021 | $ 1,800 | $ 1,800,000 | ||
| Florida Development Finance Corp. (Green Bonds); Series 2019 B, RB(d)(e) | 7.38% | 01/01/2049 | 490 | 532,011 | ||
| Greater Orlando Aviation Authority; Series 2019 A, RB(e) | 4.00% | 10/01/2044 | 1,750 | 2,013,033 | ||
| Hillsborough (County of), FL Aviation Authority (Tampa International Airport); Series 2018 E, RB(e) | 5.00% | 10/01/2048 | 1,555 | 1,920,920 | ||
| JEA Electric System Revenue; Series 2012 3B, RB | 5.00% | 10/01/2039 | 155 | 157,309 | ||
| Lake (County of), FL (Lakeside at Waterman Village); | ||||||
| Series 2020 A, Ref. RB | 5.50% | 08/15/2040 | 485 | 527,534 | ||
| Series 2020 A, Ref. RB | 5.75% | 08/15/2050 | 210 | 227,997 | ||
| Series 2020 A, Ref. RB | 5.75% | 08/15/2055 | 790 | 853,172 | ||
| Series 2020 B-3, Ref. RB | 3.38% | 08/15/2026 | 310 | 311,827 | ||
| Miami Beach (City of), FL Health Facilities Authority (Mt. Sinai Medical Center); Series 2014, Ref. RB | 5.00% | 11/15/2039 | 710 | 791,060 | ||
| Miami-Dade (County of), FL; | ||||||
| Series 2012 A, Ref. RB(e)(h)(i) | 5.00% | 10/01/2022 | 2,270 | 2,413,446 | ||
| Series 2012 A, Ref. RB(e)(h)(i) | 5.00% | 10/01/2022 | 1,510 | 1,605,420 | ||
| Series 2012 B, Ref. RB(h)(i) | 5.00% | 10/01/2022 | 870 | 926,789 | ||
| Series 2012 B, Ref. RB(h)(i) | 5.00% | 10/01/2022 | 1,375 | 1,464,753 | ||
| Series 2012 B, Ref. RB(h)(i) | 5.00% | 10/01/2022 | 1,450 | 1,544,649 | ||
| Series 2016 A, Ref. RB | 5.00% | 10/01/2041 | 965 | 1,161,098 | ||
| Miami-Dade (County of), FL Educational Facilities Authority (University of Miami); Series 2018 A, RB(c) | 5.00% | 04/01/2053 | 2,890 | 3,466,547 | ||
| Miami-Dade (County of), FL Expressway Authority; Series 2010 A, Ref. RB | 5.00% | 07/01/2040 | 1,000 | 1,002,773 | ||
| Miami-Dade (County of), FL Health Facilities Authority (Miami Children’s Hospital); Series 2010, Ref. RB | 6.13% | 08/01/2042 | 185 | 185,653 | ||
| Orlando (City of), FL Greater Orlando Aviation Authority; Series 2017 A, RB(e) | 5.00% | 10/01/2047 | 1,535 | 1,860,070 | ||
| Osceola (County of), FL; | ||||||
| Series 2020 A-2, Ref. RB(g) | 0.00% | 10/01/2050 | 1,105 | 410,999 | ||
| Series 2020 A-2, Ref. RB(g) | 0.00% | 10/01/2052 | 335 | 114,995 | ||
| Series 2020 A-2, Ref. RB(g) | 0.00% | 10/01/2053 | 335 | 110,569 | ||
| Series 2020 A-2, Ref. RB(g) | 0.00% | 10/01/2054 | 285 | 90,428 | ||
| Palm Beach (County of), FL Health Facilities Authority; Series 2020, RB | 5.00% | 06/01/2055 | 375 | 406,932 | ||
| Palm Beach (County of), FL Health Facilities Authority (BRRH Corp. Obligated Group); Series 2014, Ref. RB(h)(i) | 5.00% | 12/01/2024 | 1,125 | 1,306,675 | ||
| Palm Beach (County of), FL Solid Waste Authority; Series 2016, RB(c) | 5.00% | 10/01/2031 | 2,805 | 2,849,906 | ||
| Putnam (County of), FL Development Authority (Seminole Electric Cooperative); Series 2018 B, Ref. PCR | 5.00% | 03/15/2042 | 625 | 756,526 | ||
| Reunion East Community Development District; | ||||||
| Series 2005, RB(b)(m) | 5.80% | 05/01/2036 | 197 | 2 | ||
| Series 2015-2, RB | 6.60% | 05/01/2036 | 175 | 179,072 | ||
| Sterling Hill Community Development District; Series 2003 A, RB(m)(n) | 6.20% | 05/01/2035 | 828 | 496,596 | ||
| Sumter (County of), FL Industrial Development Authority (Central Florida Health Alliance); Series 2014 A, RB | 5.25% | 07/01/2044 | 1,000 | 1,099,449 | ||
| Tallahassee (City of), FL (Tallahassee Memorial Health Care, Inc.); Series 2016, RB | 5.00% | 12/01/2055 | 1,010 | 1,131,796 | ||
| 53,835,259 | ||||||
| Georgia–2.34% | ||||||
| Atlanta (City of), GA; Series 2015, Ref. RB(c) | 5.00% | 11/01/2040 | 6,015 | 7,005,308 | ||
| Augusta (City of), GA Development Authority; Series 2018, RB | 4.00% | 07/01/2038 | 2,265 | 2,437,050 | ||
| Brookhaven Development Authority; | ||||||
| Series 2020, RB(c)(j) | 4.00% | 07/01/2044 | 845 | 994,537 | ||
| Series 2020, RB(c)(j) | 4.00% | 07/01/2049 | 1,250 | 1,456,969 | ||
| Fulton (County of), GA Development Authority (Wellstar Health System, Inc.); Series 2017, RB | 5.00% | 04/01/2042 | 745 | 889,306 | ||
| 12,783,170 | ||||||
| Hawaii–2.76% | ||||||
| Hawaii (State of); | ||||||
| Series 2014 EO, GO Bonds | 5.00% | 08/01/2033 | 4,500 | 5,123,694 | ||
| Series 2015 A, RB(e) | 5.00% | 07/01/2041 | 645 | 740,407 | ||
| Series 2015 A, RB(e) | 5.00% | 07/01/2045 | 1,295 | 1,486,554 | ||
| Series 2018 A, RB(e) | 5.00% | 07/01/2043 | 1,150 | 1,421,012 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Hawaii–(continued) | ||||||
| Hawaii (State of) Department of Budget & Finance (Hawaii Pacific Health Obligated Group); Series 2013 A, Ref. RB(h) | 5.50% | 07/01/2043 | $ 2,500 | $ 2,744,994 | ||
| Honolulu (City & County of), HI; Series 2012 A, GO Bonds | 5.00% | 11/01/2036 | 1,000 | 1,064,333 | ||
| Honolulu (City & County of), HI Wastewater System Revenue; Series 2015 A, Ref. RB(c) | 5.00% | 07/01/2031 | 2,160 | 2,538,834 | ||
| 15,119,828 | ||||||
| Idaho–0.12% | ||||||
| Idaho (State of) Health Facilities Authority (Valley Vista Care Corp.); Series 2017 A, Ref. RB | 5.25% | 11/15/2047 | 650 | 669,320 | ||
| Illinois–18.46% | ||||||
| Bartlett (Village of), IL (Quarry Redevelopment); Series 2007, Ref. RB | 5.60% | 01/01/2023 | 555 | 556,052 | ||
| Bolingbrook (Village of), IL; Series 1999 C, Ref. GO Bonds (INS - NATL)(f)(g) | 0.00% | 01/01/2029 | 1,710 | 1,493,933 | ||
| Chicago (City of), IL; | ||||||
| Series 2002 B, GO Bonds | 5.50% | 01/01/2037 | 795 | 893,941 | ||
| Series 2005 D, Ref. GO Bonds | 5.50% | 01/01/2040 | 325 | 364,264 | ||
| Series 2007 E, Ref. GO Bonds | 5.50% | 01/01/2042 | 260 | 290,783 | ||
| Series 2011 A, RB(h)(i) | 5.25% | 01/01/2022 | 2,785 | 2,868,886 | ||
| Series 2012 A, GO Bonds | 5.00% | 01/01/2033 | 625 | 637,059 | ||
| Series 2012 A, GO Bonds (INS - BAM)(f) | 5.00% | 01/01/2033 | 1,190 | 1,213,585 | ||
| Series 2012, RB | 5.00% | 01/01/2042 | 2,585 | 2,648,305 | ||
| Series 2014, RB | 5.00% | 11/01/2044 | 665 | 751,844 | ||
| Series 2014, Ref. RB | 5.00% | 01/01/2029 | 890 | 937,302 | ||
| Series 2015 A, GO Bonds | 5.50% | 01/01/2033 | 2,590 | 2,929,176 | ||
| Series 2017 A, Ref. GO Bonds | 6.00% | 01/01/2038 | 1,550 | 1,886,788 | ||
| Chicago (City of), IL (Midway Airport); | ||||||
| Series 2013 A, Ref. RB(e) | 5.50% | 01/01/2031 | 2,600 | 2,795,907 | ||
| Series 2014 A, Ref. RB(e) | 5.00% | 01/01/2041 | 950 | 1,044,329 | ||
| Chicago (City of), IL (O’Hare International Airport); | ||||||
| Series 2013, RB | 5.75% | 01/01/2038 | 1,900 | 2,051,872 | ||
| Series 2015 C, RB(e) | 5.00% | 01/01/2046 | 645 | 730,484 | ||
| Series 2015 D, RB | 5.00% | 01/01/2046 | 450 | 517,326 | ||
| Series 2017 D, RB | 5.25% | 01/01/2042 | 1,035 | 1,275,891 | ||
| Chicago (City of), IL Board of Education; | ||||||
| Series 2017 H, GO Bonds | 5.00% | 12/01/2046 | 475 | 559,540 | ||
| Series 2018 A, Ref. GO Bonds (INS - AGM)(f) | 5.00% | 12/01/2032 | 535 | 671,123 | ||
| Series 2018 A, Ref. GO Bonds | 5.00% | 12/01/2034 | 520 | 639,901 | ||
| Series 2018 C, Ref. GO Bonds | 5.00% | 12/01/2022 | 750 | 797,227 | ||
| Chicago (City of), IL Metropolitan Water Reclamation District (Green Bonds); Series 2016 E, GO Bonds | 5.00% | 12/01/2045 | 1,335 | 1,598,380 | ||
| Chicago (City of), IL Transit Authority; | ||||||
| Series 2011, RB(c)(h)(i)(j) | 5.25% | 12/01/2021 | 4,185 | 4,292,965 | ||
| Series 2014, RB | 5.00% | 12/01/2044 | 2,590 | 2,966,750 | ||
| Chicago Park District; Series 2020 C, GO Bonds (INS - BAM)(f) | 4.00% | 01/01/2041 | 1,485 | 1,715,379 | ||
| Cook (County of), IL; Series 2021 A, Ref. RB | 4.00% | 11/15/2039 | 575 | 689,002 | ||
| Illinois (State of); | ||||||
| Series 2013, GO Bonds (INS - AGM)(f) | 5.25% | 07/01/2029 | 1,660 | 1,818,647 | ||
| Series 2014, GO Bonds | 5.25% | 02/01/2034 | 1,050 | 1,153,872 | ||
| Series 2014, GO Bonds | 5.00% | 05/01/2035 | 355 | 390,324 | ||
| Series 2014, GO Bonds | 5.00% | 05/01/2036 | 850 | 933,563 | ||
| Series 2016, GO Bonds | 5.00% | 11/01/2036 | 895 | 1,039,775 | ||
| Series 2017 C, GO Bonds | 5.00% | 11/01/2029 | 195 | 235,788 | ||
| Series 2017 D, GO Bonds | 5.00% | 11/01/2024 | 115 | 132,073 | ||
| Series 2017 D, GO Bonds | 5.00% | 11/01/2026 | 1,880 | 2,270,912 | ||
| Series 2018 A, GO Bonds | 6.00% | 05/01/2027 | 575 | 734,702 | ||
| Series 2018 A, GO Bonds | 5.00% | 05/01/2030 | 935 | 1,140,183 | ||
| Series 2018 A, Ref. GO Bonds | 5.00% | 10/01/2021 | 1,550 | 1,574,306 | ||
| Series 2018 A, Ref. GO Bonds | 5.00% | 10/01/2022 | 435 | 461,645 | ||
| Series 2020, GO Bonds | 5.50% | 05/01/2039 | 1,040 | 1,335,233 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Illinois–(continued) | ||||||
| Illinois (State of) Finance Authority (Art Institute of Chicago); | ||||||
| Series 2012, RB(h)(i) | 5.00% | 03/01/2022 | $ 5 | $ 5,180 | ||
| Series 2012, RB(h)(i) | 5.00% | 03/01/2022 | 995 | 1,031,253 | ||
| Illinois (State of) Finance Authority (Centegra Health System); Series 2014 A, RB | 5.00% | 09/01/2039 | 1,100 | 1,231,079 | ||
| Illinois (State of) Finance Authority (CITGO Petroleum Corp.); Series 2002, RB(e) | 8.00% | 06/01/2032 | 270 | 270,328 | ||
| Illinois (State of) Finance Authority (Loyola University of Chicago); Series 2012 B, RB | 5.00% | 07/01/2042 | 2,000 | 2,094,692 | ||
| Illinois (State of) Finance Authority (Lutheran Communities Obligated Group); | ||||||
| Series 2019 A, Ref. RB | 5.00% | 11/01/2040 | 45 | 51,175 | ||
| Series 2019 A, Ref. RB | 5.00% | 11/01/2049 | 410 | 460,935 | ||
| Illinois (State of) Finance Authority (Navistar International Corp.); Series 2020, Ref. RB(d)(i) | 4.75% | 08/01/2030 | 620 | 661,042 | ||
| Illinois (State of) Finance Authority (OSF Healthcare System); Series 2015 A, Ref. RB | 5.00% | 11/15/2045 | 1,810 | 2,086,260 | ||
| Illinois (State of) Finance Authority (Park Place of Elmhurst); Series 2016, RB | 5.13% | 05/15/2060 | 991 | 998,176 | ||
| Illinois (State of) Finance Authority (Roosevelt University); Series 2007, RB | 5.50% | 04/01/2037 | 1,000 | 1,002,002 | ||
| Illinois (State of) Finance Authority (Rush University Medical Center); Series 2015 A, Ref. RB | 5.00% | 11/15/2038 | 1,570 | 1,821,102 | ||
| Illinois (State of) Finance Authority (Three Crowns Park); | ||||||
| Series 2017, Ref. RB | 5.00% | 02/15/2032 | 155 | 158,146 | ||
| Series 2017, Ref. RB | 5.25% | 02/15/2037 | 145 | 148,283 | ||
| Series 2017, Ref. RB | 5.25% | 02/15/2047 | 620 | 624,808 | ||
| Illinois (State of) Finance Authority (University of Chicago); Series 2013 A, RB(c)(h)(i) | 5.25% | 04/01/2023 | 2,460 | 2,688,779 | ||
| Illinois (State of) Metropolitan Pier & Exposition Authority; Series 2002, RB (INS - AGM)(f)(g) | 0.00% | 12/15/2029 | 2,100 | 1,796,118 | ||
| Illinois (State of) Metropolitan Pier & Exposition Authority (McCormick Place Expansion); Series 2015 A, RB | 5.50% | 06/15/2053 | 4,500 | 5,199,760 | ||
| Illinois (State of) Sports Facilities Authority (The); | ||||||
| Series 2014, Ref. RB (INS - AGM)(f) | 5.25% | 06/15/2031 | 920 | 1,023,847 | ||
| Series 2014, Ref. RB (INS - AGM)(f) | 5.25% | 06/15/2032 | 840 | 932,962 | ||
| Illinois (State of) Toll Highway Authority; | ||||||
| Series 2013 A, RB(c) | 5.00% | 01/01/2038 | 3,125 | 3,343,133 | ||
| Series 2014 C, RB(c) | 5.00% | 01/01/2039 | 3,760 | 4,301,013 | ||
| Series 2015 A, RB(c) | 5.00% | 01/01/2040 | 1,500 | 1,743,316 | ||
| Metropolitan Water Reclamation District of Greater Chicago; Series 2007 B, Ref. GO Bonds | 5.25% | 12/01/2035 | 1,000 | 1,478,083 | ||
| Peoria (County of), IL; Series 2011, GO Bonds(c) | 5.00% | 12/15/2041 | 3,425 | 3,436,398 | ||
| Peoria, Moline & Freeport (Cities of), IL; Series 1995 A, RB (CEP - GNMA)(e) | 7.60% | 04/01/2027 | 10 | 10,039 | ||
| Regional Transportation Authority; | ||||||
| Series 2000, RB (INS - NATL)(f) | 6.50% | 07/01/2030 | 1,685 | 2,281,391 | ||
| Series 2002 A, RB (INS - NATL)(f) | 6.00% | 07/01/2029 | 860 | 1,151,240 | ||
| Series 2018 B, RB | 5.00% | 06/01/2040 | 1,730 | 2,142,281 | ||
| Sales Tax Securitization Corp.; Series 2018 A, Ref. RB(c) | 5.00% | 01/01/2048 | 3,135 | 3,751,542 | ||
| 100,963,380 | ||||||
| Indiana–2.56% | ||||||
| Indiana (State of) Finance Authority (CWA Authority); Series 2011 B, RB | 5.25% | 10/01/2031 | 2,550 | 2,591,806 | ||
| Indiana (State of) Finance Authority (Ohio River Bridges East End Crossing); | ||||||
| Series 2013 A, RB(e) | 5.00% | 07/01/2035 | 500 | 544,669 | ||
| Series 2013 A, RB(e) | 5.00% | 07/01/2048 | 440 | 478,415 | ||
| Series 2013, RB(e) | 5.00% | 07/01/2040 | 2,940 | 3,201,024 | ||
| Indiana (State of) Finance Authority (Ohio Valley Electrical Corp.); | ||||||
| Series 2012 A, RB | 5.00% | 06/01/2032 | 610 | 629,022 | ||
| Series 2012 A, RB | 5.00% | 06/01/2039 | 2,550 | 2,622,398 | ||
| Indiana (State of) Municipal Power Agency; | ||||||
| Series 2013 A, RB(h)(i) | 5.25% | 07/01/2023 | 1,000 | 1,105,238 | ||
| Series 2016 A, Ref. RB | 5.00% | 01/01/2042 | 940 | 1,133,727 | ||
| Valparaiso (City of), IN (Pratt Paper, LLC); Series 2013, RB(e) | 6.75% | 01/01/2034 | 1,500 | 1,693,685 | ||
| 13,999,984 | ||||||
| Iowa–1.58% | ||||||
| Iowa (State of) Finance Authority (Alcoa, Inc.); Series 2012, RB | 4.75% | 08/01/2042 | 310 | 320,115 | ||
| Iowa (State of) Finance Authority (Iowa Fertilizer Co.); | ||||||
| Series 2013, RB | 5.25% | 12/01/2025 | 965 | 1,056,861 | ||
| Series 2013, Ref. RB(i) | 5.25% | 12/01/2037 | 965 | 1,065,407 | ||
| Series 2019, Ref. RB | 3.13% | 12/01/2022 | 220 | 224,451 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Iowa–(continued) | ||||||
| Iowa (State of) Finance Authority (Lifespace Communities, Inc.); Series 2016, RB | 5.00% | 05/15/2041 | $ 375 | $ 426,844 | ||
| Iowa (State of) Tobacco Settlement Authority; | ||||||
| Series 2021 A-2, Ref. RB | 5.00% | 06/01/2030 | 755 | 1,000,503 | ||
| Series 2021 A-2, Ref. RB | 4.00% | 06/01/2049 | 900 | 1,044,671 | ||
| Series 2021 B-1, Ref. RB | 0.38% | 06/01/2030 | 70 | 70,053 | ||
| Series 2021 B-1, Ref. RB | 4.00% | 06/01/2049 | 1,425 | 1,661,017 | ||
| Series 2021 B-2, Ref. RB(g) | 0.00% | 06/01/2065 | 10,165 | 1,795,465 | ||
| 8,665,387 | ||||||
| Kansas–0.25% | ||||||
| Kansas (State of) Municipal Energy Agency (Jameson Energy Center); Series 2013, RB | 5.75% | 07/01/2038 | 1,215 | 1,349,884 | ||
| Kentucky–2.29% | ||||||
| Kentucky (Commonwealth of) Economic Development Finance Authority (Catholic Health Initiatives); Series 2011 B, RB (SIFMA Municipal Swap Index + 1.40%)(i)(o) | 1.43% | 02/01/2025 | 530 | 534,810 | ||
| Kentucky (Commonwealth of) Economic Development Finance Authority (Louisville Arena Authority, Inc.); Series 2017 A, Ref. RB (INS - AGM)(f) | 5.00% | 12/01/2047 | 835 | 888,713 | ||
| Kentucky (Commonwealth of) Economic Development Finance Authority (Next Generation Kentucky Information Highway); | ||||||
| Series 2015 A, RB | 5.00% | 07/01/2040 | 1,515 | 1,690,510 | ||
| Series 2015 A, RB | 5.00% | 01/01/2045 | 255 | 283,027 | ||
| Kentucky (Commonwealth of) Economic Development Finance Authority (Owensboro Health, Inc.); | ||||||
| Series 2017 A, Ref. RB | 5.25% | 06/01/2041 | 945 | 1,108,092 | ||
| Series 2017 A, Ref. RB | 5.00% | 06/01/2045 | 775 | 886,418 | ||
| Kentucky (Commonwealth of) Public Energy Authority; Series 2019 C, RB(i) | 4.00% | 02/01/2028 | 1,115 | 1,328,843 | ||
| Kentucky (Commonwealth of) Public Transportation Infrastructure Authority (Downtown Crossing); Series 2013 A, RB | 5.75% | 07/01/2049 | 1,000 | 1,104,119 | ||
| Kentucky Bond Development Corp.; Series 2020, RB (INS - BAM)(c)(f)(j) | 5.00% | 09/01/2044 | 2,860 | 3,577,387 | ||
| Louisville (City of) & Jefferson (County of), KY Metropolitan Government (Norton Healthcare, Inc.); Series 2013 A, RB | 5.50% | 10/01/2033 | 1,000 | 1,111,232 | ||
| 12,513,151 | ||||||
| Louisiana–1.20% | ||||||
| Louisiana (State of) Energy & Power Authority (LEPA Unit No. 1); Series 2013 A, RB (INS - AGM)(f) | 5.25% | 06/01/2033 | 2,000 | 2,190,947 | ||
| Louisiana (State of) Local Government Environmental Facilities & Community Development Authority (St. John the Baptist) (Green Bonds); Series 2019, RB(d) | 3.90% | 11/01/2044 | 715 | 753,268 | ||
| Louisiana (State of) Public Facilities Authority (Tulane University of Louisiana); Series 2020, Ref. RB | 4.00% | 04/01/2050 | 500 | 573,088 | ||
| New Orleans (City of), LA Aviation Board (Parking Facilities Corp. Consolidated Garage System); Series 2018 A, RB (INS - AGM)(f) | 5.00% | 10/01/2043 | 335 | 410,909 | ||
| Tobacco Settlement Financing Corp.; | ||||||
| Series 2013 A, Ref. RB | 5.25% | 05/15/2031 | 235 | 235,724 | ||
| Series 2013 A, Ref. RB | 5.25% | 05/15/2032 | 1,245 | 1,298,694 | ||
| Series 2013 A, Ref. RB | 5.25% | 05/15/2033 | 1,050 | 1,094,462 | ||
| 6,557,092 | ||||||
| Maryland–0.99% | ||||||
| Brunswick (City of), MD (Brunswick Crossing); Series 2019, RB | 5.00% | 07/01/2036 | 285 | 342,858 | ||
| Maryland (State of) Health & Higher Educational Facilities Authority (LifeBridge Health); Series 2016, Ref. RB | 5.00% | 07/01/2047 | 590 | 700,032 | ||
| Maryland (State of) Health & Higher Educational Facilities Authority (Peninsula Regional Medical Center); Series 2015, Ref. RB(h)(i) | 5.00% | 07/01/2024 | 1,205 | 1,378,932 | ||
| Maryland (State of) Health & Higher Educational Facilities Authority (Stevenson University); Series 2021, Ref. RB | 4.00% | 06/01/2038 | 500 | 581,129 | ||
| Maryland (State of) Transportation Authority; Series 2021 A, Ref. RB | 5.00% | 07/01/2051 | 935 | 1,226,111 | ||
| Prince Georges (County of), MD (Collington Episcopal Life Care Community, Inc.); Series 2017, Ref. RB | 5.00% | 04/01/2029 | 690 | 746,018 | ||
| Rockville (City of), MD (Ingleside at King Farm); Series 2017 B, RB | 5.00% | 11/01/2047 | 405 | 431,906 | ||
| 5,406,986 | ||||||
| Massachusetts–1.44% | ||||||
| Massachusetts (Commonwealth of) Development Finance Agency (Caregroup); Series 2018 J-2, RB | 5.00% | 07/01/2048 | 1,850 | 2,233,398 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Massachusetts–(continued) | ||||||
| Massachusetts (Commonwealth of) Development Finance Agency (Emerson College); Series 2016 A, RB | 5.00% | 01/01/2047 | $ 2,525 | $ 2,937,119 | ||
| Massachusetts (Commonwealth of) Development Finance Agency (Milford Regional Medical Center); Series 2020, Ref. RB(d) | 5.00% | 07/15/2036 | 235 | 283,540 | ||
| Massachusetts (Commonwealth of) Port Authority; Series 2019 A, Ref. RB(e) | 5.00% | 07/01/2036 | 740 | 932,169 | ||
| Massachusetts (State of) Water Resources Authority; Series 2011 C, Ref. RB(h)(i) | 5.00% | 08/01/2021 | 1,500 | 1,512,140 | ||
| 7,898,366 | ||||||
| Michigan–4.19% | ||||||
| Academy of Warren; Series 2020 A, Ref. RB(d) | 5.50% | 05/01/2050 | 250 | 263,375 | ||
| Detroit Downtown Development Authority; Series 2018 A, Ref. RB (INS - AGM)(c)(f)(j) | 5.00% | 07/01/2043 | 1,590 | 1,787,494 | ||
| Michigan (State of) Building Authority; Series 2020, Ref. VRD RB(p) | 0.08% | 10/15/2042 | 500 | 500,000 | ||
| Michigan (State of) Building Authority (Facilities Program); Series 2016 I, Ref. RB(c) | 5.00% | 04/15/2041 | 2,190 | 2,607,886 | ||
| Michigan (State of) Finance Authority; Series 2014 C-1, RB(h)(i) | 5.00% | 07/01/2022 | 950 | 1,000,366 | ||
| Michigan (State of) Finance Authority (Beaumont Health Credit Group); Series 2016, RB | 5.00% | 11/01/2044 | 1,415 | 1,647,220 | ||
| Michigan (State of) Finance Authority (Charter County of Wayne Criminal Justice Center); Series 2018, RB | 5.00% | 11/01/2043 | 615 | 760,072 | ||
| Michigan (State of) Finance Authority (Detroit Water & Sewerage Department); | ||||||
| Series 2014 C-3, Ref. RB (INS - AGM)(f) | 5.00% | 07/01/2031 | 2,500 | 2,841,633 | ||
| Series 2014 C-6, Ref. RB | 5.00% | 07/01/2033 | 475 | 539,284 | ||
| Series 2014 D-4, Ref. RB | 5.00% | 07/01/2029 | 475 | 540,067 | ||
| Series 2015, Ref. RB | 5.00% | 07/01/2035 | 970 | 1,132,861 | ||
| Michigan (State of) Finance Authority (Landmark Academy); | ||||||
| Series 2020, Ref. RB | 5.00% | 06/01/2035 | 125 | 138,326 | ||
| Series 2020, Ref. RB | 5.00% | 06/01/2045 | 360 | 392,815 | ||
| Michigan (State of) Finance Authority (MidMichigan Health Credit Group); Series 2014, Ref. RB(h)(i) | 5.00% | 06/01/2024 | 1,740 | 1,982,149 | ||
| Michigan (State of) Finance Authority (Trinity Health Credit); Series 2017 MI, Ref. RB(c)(h)(j) | 5.00% | 12/01/2046 | 2,965 | 3,563,356 | ||
| Michigan (State of) Hospital Finance Authority (Ascension Health); Series 2010, Ref. RB | 5.00% | 11/15/2047 | 1,000 | 1,268,785 | ||
| Michigan (State of) Strategic Fund (I-85 Improvement Project); Series 2018, RB(e) | 5.00% | 06/30/2033 | 600 | 746,700 | ||
| Oakland University; Series 2012, RB | 5.00% | 03/01/2032 | 1,145 | 1,181,763 | ||
| 22,894,152 | ||||||
| Minnesota–0.35% | ||||||
| Bethel (City of), MN (Spectrum High School); Series 2017 A, Ref. RB | 4.25% | 07/01/2047 | 400 | 428,709 | ||
| St. Cloud (City of), MN (CentraCare Health System); Series 2019, Ref. RB | 5.00% | 05/01/2048 | 925 | 1,143,982 | ||
| St. Paul (City of), MN Housing & Redevelopment Authority (Hope Community Academy); Series 2020, RB | 5.00% | 12/01/2055 | 315 | 338,656 | ||
| 1,911,347 | ||||||
| Mississippi–0.23% | ||||||
| West Rankin Utility Authority; Series 2018, RB (INS - AGM)(f) | 5.00% | 01/01/2048 | 1,010 | 1,234,567 | ||
| Missouri–1.51% | ||||||
| Kansas City (City of), MO Industrial Development Authority (Downtown Redevelopment District); | ||||||
| Series 2011 A, Ref. RB | 5.50% | 09/01/2027 | 800 | 810,303 | ||
| Series 2011 A, Ref. RB | 5.50% | 09/01/2028 | 1,670 | 1,691,507 | ||
| Kansas City (City of), MO Industrial Development Authority (Kansas City International Airport); | ||||||
| Series 2019 B, RB(e) | 5.00% | 03/01/2046 | 900 | 1,102,873 | ||
| Series 2019 B, RB (INS - AGM)(e)(f) | 5.00% | 03/01/2049 | 745 | 915,802 | ||
| Kirkwood (City of), MO Industrial Development Authority (Aberdeen Heights); Series 2017 A, Ref. RB | 5.25% | 05/15/2050 | 385 | 423,520 | ||
| Missouri (State of) Health & Educational Facilities Authority (Lutheran Senior Services); Series 2019, Ref. RB | 5.00% | 02/01/2048 | 245 | 296,306 | ||
| Missouri (State of) Health & Educational Facilities Authority (St. Louis College of Pharmacy); Series 2013, RB | 5.25% | 05/01/2033 | 1,175 | 1,247,028 | ||
| St. Louis (County of), MO Industrial Development Authority (Friendship Village West County); Series 2018 A, RB | 5.00% | 09/01/2038 | 1,565 | 1,771,426 | ||
| 8,258,765 | ||||||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Nebraska–1.57% | ||||||
| Central Plains Energy Project (No. 3); | ||||||
| Series 2012, RB(q) | 5.25% | 09/01/2037 | $ 1,000 | $ 1,062,612 | ||
| Series 2012, RB(q) | 5.00% | 09/01/2042 | 3,250 | 3,443,373 | ||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2034 | 155 | 214,133 | ||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2042 | 1,610 | 2,386,212 | ||
| Central Plains Energy Project (No. 4); Series 2018, RB(i) | 5.00% | 01/01/2024 | 1,345 | 1,491,466 | ||
| 8,597,796 | ||||||
| New Hampshire–0.39% | ||||||
| New Hampshire (State of) Health and Education Facilities Authority; Series 2020 A, RB | 5.00% | 08/01/2059 | 1,340 | 2,139,756 | ||
| New Hampshire Business Finance Authority; Series 2020-1, Class A | 4.13% | 01/20/2034 | 1 | 1,185 | ||
| 2,140,941 | ||||||
| New Jersey–6.87% | ||||||
| Garden State Preservation Trust; Series 2005 A, RB (INS - AGM)(f) | 5.75% | 11/01/2028 | 685 | 847,153 | ||
| New Jersey (State of) Economic Development Authority; | ||||||
| Series 2005 N-1, Ref. RB (INS - NATL)(c)(f)(j) | 5.50% | 09/01/2022 | 2,820 | 3,004,456 | ||
| Series 2021, RB | 4.00% | 06/15/2037 | 900 | 1,058,413 | ||
| New Jersey (State of) Economic Development Authority (Continental Airlines, Inc.); Series 1999, RB(e) | 5.13% | 09/15/2023 | 500 | 529,649 | ||
| New Jersey (State of) Economic Development Authority (Port Newark Container Terminal LLC); Series 2017, Ref. RB(e) | 5.00% | 10/01/2037 | 715 | 839,145 | ||
| New Jersey (State of) Economic Development Authority (The Goethals Bridge Replacement); Series 2013, RB(e) | 5.38% | 01/01/2043 | 2,000 | 2,241,428 | ||
| New Jersey (State of) Higher Education Student Assistance Authority; Series 2018 B, Ref. RB(e) | 5.00% | 12/01/2024 | 830 | 956,330 | ||
| New Jersey (State of) Transportation Trust Fund Authority; | ||||||
| Series 2008 A, RB (INS - BAM)(f)(g) | 0.00% | 12/15/2037 | 1,500 | 1,042,949 | ||
| Series 2010 D, RB | 5.00% | 12/15/2023 | 1,700 | 1,903,143 | ||
| Series 2011 B, RB(h)(i) | 5.50% | 06/15/2021 | 790 | 791,522 | ||
| Series 2014, RB | 5.00% | 06/15/2030 | 685 | 863,016 | ||
| Series 2015 AA, RB | 5.25% | 06/15/2033 | 1,150 | 1,327,660 | ||
| Series 2018 A, Ref. RB | 5.00% | 12/15/2024 | 355 | 411,788 | ||
| Series 2018 A, Ref. RB | 5.00% | 12/15/2032 | 925 | 1,158,684 | ||
| Series 2018 A, Ref. RB | 5.00% | 12/15/2036 | 440 | 546,655 | ||
| Series 2018 A, Ref. RN(c)(j) | 5.00% | 06/15/2029 | 1,190 | 1,416,497 | ||
| Series 2018 A, Ref. RN(c)(j) | 5.00% | 06/15/2030 | 405 | 479,710 | ||
| Series 2018 A, Ref. RN(c)(j) | 5.00% | 06/15/2031 | 565 | 667,404 | ||
| Series 2022 AA, Ref. RB | 5.00% | 06/15/2036 | 1,370 | 1,695,730 | ||
| Subseries 2016 A-1, RN | 5.00% | 06/15/2028 | 770 | 921,510 | ||
| New Jersey (State of) Turnpike Authority; Series 2013 A, RB(h)(i) | 5.00% | 07/01/2022 | 2,600 | 2,737,844 | ||
| New Jersey Economic Development Authority; Series 2004 A, RB(c)(h) | 5.25% | 07/01/2026 | 6,625 | 8,162,917 | ||
| Salem (County of), NJ Pollution Control Financing Authority (Chambers); Series 2014 A, Ref. PCR(e) | 5.00% | 12/01/2023 | 925 | 976,131 | ||
| Tobacco Settlement Financing Corp.; | ||||||
| Series 2018 A, Ref. RB | 5.00% | 06/01/2046 | 1,880 | 2,246,567 | ||
| Series 2018 A, Ref. RB | 5.25% | 06/01/2046 | 625 | 761,577 | ||
| 37,587,878 | ||||||
| New Mexico–0.06% | ||||||
| Santa Fe (City of), NM (El Castillo Retirement); Series 2019 A, RB | 5.00% | 05/15/2049 | 300 | 335,333 | ||
| New York–20.26% | ||||||
| Build NYC Resource Corp. (Brooklyn Navy Yard); Series 2019, Ref. RB(d)(e) | 5.25% | 12/31/2033 | 200 | 218,801 | ||
| Erie Tobacco Asset Securitization Corp.; Series 2005 A, RB | 5.00% | 06/01/2045 | 2,070 | 2,072,462 | ||
| Hudson Yards Infrastructure Corp; Series 2020-XF2859, Ctfs. (INS - AGM)(c)(f) | 4.00% | 02/15/2047 | 2,470 | 2,758,270 | ||
| Metropolitan Transportation Authority; | ||||||
| Series 2013 B, RB | 5.00% | 11/15/2038 | 1,425 | 1,528,719 | ||
| Series 2016 A, Ref. RB | 5.25% | 11/15/2032 | 465 | 572,117 | ||
| Series 2016 B, Ref. RB | 5.00% | 11/15/2037 | 110 | 131,229 | ||
| Series 2019 A, RB (INS - AGM)(c)(f) | 4.00% | 11/15/2046 | 1,995 | 2,290,840 | ||
| Series 2020 A-2, RB | 4.00% | 02/01/2022 | 870 | 891,693 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| New York–(continued) | ||||||
| Metropolitan Transportation Authority (Green Bonds); | ||||||
| Series 2016 A1, RB | 5.00% | 11/15/2041 | $ 1,510 | $ 1,766,152 | ||
| Series 2017 C-1, Ref. RB | 5.00% | 11/15/2023 | 450 | 500,708 | ||
| Series 2020 A-1, RB (INS - BAM)(f) | 4.00% | 11/15/2053 | 295 | 341,293 | ||
| Series 2020 C-1, RB | 5.25% | 11/15/2055 | 995 | 1,241,130 | ||
| New York & New Jersey (States of) Port Authority; Two Hundred Seventh Series 2018, Ref. RB(c)(e)(j) | 5.00% | 09/15/2028 | 2,460 | 3,114,120 | ||
| New York (City of), NY; | ||||||
| Series 2020-XM0925, GO Bonds(c) | 5.00% | 08/01/2043 | 1,730 | 2,206,780 | ||
| Series 2021-XM0937, Revenue Ctfs.(c) | 4.00% | 03/01/2047 | 1,935 | 2,297,749 | ||
| New York (City of), NY Industrial Development Agency (Yankee Stadium); Series 2020, Ref. RB (INS - AGM)(f) | 3.00% | 03/01/2049 | 1,875 | 1,978,268 | ||
| New York (City of), NY Municipal Water Finance Authority; | ||||||
| Series 2012 FF, RB(c) | 5.00% | 06/15/2045 | 5,515 | 5,780,845 | ||
| Series 2013 DD, RB | 5.00% | 06/15/2035 | 1,000 | 1,095,123 | ||
| Series 2020 GG-1, RB(c) | 5.00% | 06/15/2050 | 3,225 | 4,111,486 | ||
| New York (City of), NY Transitional Finance Authority; Series 2018 S-2A, Ref. RB | 5.00% | 07/15/2034 | 925 | 1,169,493 | ||
| New York (County of), NY Tobacco Trust VI; Subseries 2016 A-1, Ref. RB | 5.75% | 06/01/2043 | 2,370 | 3,118,206 | ||
| New York (State of) Dormitory Authority; | ||||||
| Series 2018 E, RB(c) | 5.00% | 03/15/2045 | 4,260 | 5,340,724 | ||
| Series 2021-XM0939, Revenue Ctfs.(c) | 4.00% | 03/15/2042 | 3,180 | 3,810,018 | ||
| New York (State of) Dormitory Authority (General Purpose); | ||||||
| Series 2013 A, RB(h)(i) | 5.00% | 02/15/2023 | 7,900 | 8,559,825 | ||
| Series 2014 C, RB(c) | 5.00% | 03/15/2040 | 4,210 | 4,717,381 | ||
| Series 2018 A, Ref. RB | 5.25% | 03/15/2038 | 925 | 1,189,486 | ||
| New York (State of) Utility Debt Securitization Authority; Series 2013 TE, RB(c) | 5.00% | 12/15/2031 | 2,785 | 3,119,778 | ||
| New York City (City of), NY Transitional Finance Authority; Series 2020-XF2864, Ctfs.(c) | 4.00% | 11/01/2045 | 2,490 | 2,925,066 | ||
| New York Liberty Development Corp. (3 World Trade Center); Series 2014, Class 1, Ref. RB(d) | 5.00% | 11/15/2044 | 4,375 | 4,841,600 | ||
| New York Liberty Development Corp. (7 World Trade Center); Series 2012, Class 2, Ref. RB | 5.00% | 09/15/2043 | 2,000 | 2,067,962 | ||
| New York Power Authority; Series 2020-XF0956, Ctfs.(c) | 4.00% | 11/15/2050 | 2,750 | 3,230,875 | ||
| New York State Thruway Authority; | ||||||
| Series 2020-XM0830, Ctfs.(c) | 4.00% | 01/01/2050 | 4,030 | 4,659,905 | ||
| Series 2020-XX1127, Ctfs. (INS - AGM)(c)(f)(j) | 4.00% | 01/01/2050 | 1,950 | 2,274,857 | ||
| New York Transportation Development Corp. (American Airlines, Inc. John F. Kennedy International Airport); | ||||||
| Series 2016, Ref. RB(e) | 5.00% | 08/01/2021 | 1,540 | 1,551,799 | ||
| Series 2020, Ref. RB(e) | 5.25% | 08/01/2031 | 490 | 585,284 | ||
| Series 2020, Ref. RB(e) | 5.38% | 08/01/2036 | 705 | 885,168 | ||
| New York Transportation Development Corp. (American Airlines, Inc.); | ||||||
| Series 2016, Ref. RB(e) | 5.00% | 08/01/2026 | 1,285 | 1,294,401 | ||
| Series 2016, Ref. RB(e) | 5.00% | 08/01/2031 | 1,000 | 1,007,074 | ||
| New York Transportation Development Corp. (Delta Air Lines, Inc. LaGuardia Airport Terminal C&D Redevelopment); | ||||||
| Series 2018, RB(e) | 5.00% | 01/01/2031 | 180 | 220,123 | ||
| Series 2018, RB(e) | 5.00% | 01/01/2033 | 1,565 | 1,903,411 | ||
| Series 2018, RB(e) | 5.00% | 01/01/2034 | 1,285 | 1,559,030 | ||
| Series 2018, RB(e) | 4.00% | 01/01/2036 | 1,125 | 1,283,304 | ||
| Series 2018, RB(e) | 5.00% | 01/01/2036 | 335 | 405,441 | ||
| New York Transportation Development Corp. (Delta Air Lines, Inc.-Laguardia); Series 2020, RB(e) | 5.00% | 10/01/2040 | 1,495 | 1,890,197 | ||
| New York Transportation Development Corp. (LaGuardia Airport Terminal B Redevelopment); | ||||||
| Series 2016 A, RB(e) | 5.00% | 07/01/2046 | 2,465 | 2,789,369 | ||
| Series 2016 A, RB(e) | 5.25% | 01/01/2050 | 1,355 | 1,539,988 | ||
| Rockland Tobacco Asset Securitization Corp.; Series 2001, RB | 5.75% | 08/15/2043 | 1,295 | 1,306,749 | ||
| Tender Option Bond Trust Receipts/Certificates; Series 2021-XF2932, Revenue Ctfs.(c) | 5.00% | 06/15/2048 | 1,485 | 1,896,533 | ||
| Triborough Bridge & Tunnel Authority; Series 2020-XL0169, Revenue Ctfs.(c) | 5.00% | 05/15/2051 | 1,620 | 2,094,618 | ||
| Triborough Bridge & Tunnel Authority (MTA Bridges & Tunnels); Series 2021 A, RB | 5.00% | 11/15/2051 | 500 | 643,586 | ||
| TSASC, Inc.; Series 2016 B, Ref. RB | 5.00% | 06/01/2045 | 1,815 | 2,000,319 | ||
| 110,779,355 | ||||||
| North Carolina–2.82% | ||||||
| Charlotte-Mecklenburg Hospital Authority (The) (Atrium Health Obligated Group); Series 2021, RB(i) | 5.00% | 12/01/2028 | 625 | 807,755 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| North Carolina–(continued) | ||||||
| Charlotte-Mecklenburg Hospital Authority (The) (Atrium Health); Series 2018 H, VRD RB(p) | 0.01% | 01/15/2048 | $ 2,000 | $ 2,000,000 | ||
| North Carolina (State of) Department of Transportation (I-77 HOT Lanes); Series 2015, RB(e) | 5.00% | 06/30/2054 | 1,810 | 1,992,712 | ||
| North Carolina Capital Facilities Finance Agency; Series 2015 B, Ref. RB(c)(h)(i) | 5.00% | 10/01/2025 | 7,265 | 8,698,305 | ||
| University of North Carolina at Chapel Hill (University of North Carolina Hospital); Series 2019, RB | 5.00% | 02/01/2049 | 1,230 | 1,899,329 | ||
| 15,398,101 | ||||||
| North Dakota–0.64% | ||||||
| Ward (County of), ND (Trinity Obligated Group); | ||||||
| Series 2017 C, RB | 5.00% | 06/01/2043 | 1,615 | 1,863,845 | ||
| Series 2017 C, RB | 5.00% | 06/01/2048 | 1,440 | 1,651,808 | ||
| 3,515,653 | ||||||
| Ohio–7.82% | ||||||
| Akron, Bath & Copley Joint Township Hospital District (Summa Health Obligated Group); Series 2016, Ref. RB | 5.25% | 11/15/2046 | 645 | 761,127 | ||
| American Municipal Power, Inc.; Series 2015 A, Ref. RB | 5.00% | 02/15/2042 | 820 | 908,384 | ||
| American Municipal Power, Inc. (AMP Fremont Energy Center); Series 2012, RB | 5.00% | 02/15/2037 | 2,670 | 2,762,208 | ||
| American Municipal Power, Inc. (Combined Hydroelectric); Series 2016 A, Ref. RB | 5.00% | 02/15/2037 | 1,095 | 1,299,338 | ||
| American Municipal Power, Inc. (Greenup Hydroelectric); Series 2016 A, RB | 5.00% | 02/15/2046 | 405 | 479,961 | ||
| Buckeye Tobacco Settlement Financing Authority; | ||||||
| Series 2020 A-2, Ref. RB | 4.00% | 06/01/2039 | 355 | 421,369 | ||
| Series 2020 A-2, Ref. RB | 4.00% | 06/01/2048 | 2,365 | 2,737,903 | ||
| Series 2020 B-2, Ref. RB | 5.00% | 06/01/2055 | 6,125 | 7,100,333 | ||
| Series 2020 B-3, Ref. RB(g) | 0.00% | 06/01/2057 | 6,405 | 1,031,680 | ||
| Cleveland (City of) & Cuyahoga (County of), OH Port Authority (Constellation Schools); Series 2014 A, Ref. RB | 6.50% | 01/01/2034 | 900 | 972,509 | ||
| Columbus-Franklin (County of), OH Finance Authority (Easton); Series 2020, RB(d) | 5.00% | 06/01/2028 | 590 | 632,160 | ||
| Cuyahoga (County of), OH (Metrohealth System); Series 2017, Ref. RB | 5.50% | 02/15/2052 | 1,290 | 1,531,919 | ||
| Franklin (County of), OH (OhioHealth Corp.); Series 2011 A, RB(c)(h)(i)(j) | 5.00% | 11/15/2021 | 2,685 | 2,745,038 | ||
| Gallia (County of), OH (Holzer Health System Obligated Group); Series 2012, Ref. RB(h)(i) | 8.00% | 07/01/2022 | 765 | 824,597 | ||
| Hamilton (County of), OH (Christ Hospital); Series 2012, RB(h)(i) | 5.25% | 06/01/2022 | 2,750 | 2,890,272 | ||
| Hamilton (County of), OH (Life Enriching Communities); Series 2016, Ref.RB | 5.00% | 01/01/2046 | 1,135 | 1,259,141 | ||
| Hamilton (County of), OH (Trihealth, Inc. Obligated Group); Series 2017 A, RB | 5.00% | 08/15/2047 | 1,885 | 2,268,004 | ||
| Hancock (County of), OH (Blanchard Valley Regional Health Center); Series 2011 A, RB(h)(i) | 6.25% | 06/01/2021 | 875 | 875,000 | ||
| Lucas (County of), OH (ProMedica Healthcare System); Series 2018 A, Ref. RB | 5.25% | 11/15/2048 | 1,250 | 1,448,424 | ||
| Montgomery (County of), OH (Trousdale Foundation Properties); Series 2018 A, RB (Acquired 08/29/2018; Cost $1,003,739)(d)(l) | 6.00% | 04/01/2038 | 1,025 | 493,597 | ||
| Ohio (State of) (Portsmouth Bypass); Series 2015, RB (INS - AGM)(e)(f) | 5.00% | 12/31/2039 | 615 | 697,774 | ||
| Ohio (State of) Air Quality Development Authority (Ohio Valley Electric Corp.); Series 2014, RB(e)(i) | 2.60% | 10/01/2029 | 1,000 | 1,063,601 | ||
| Ohio (State of) Air Quality Development Authority (Pratt Paper LLC); Series 2017, RB(d)(e) | 4.25% | 01/15/2038 | 440 | 496,718 | ||
| Ohio (State of) Higher Educational Facility Commission (Cleveland Clinic Health System Obligated Group); Series 2008 B4, Ref. VRD RB(p) | 0.01% | 01/01/2043 | 5,440 | 5,440,000 | ||
| Ohio (State of) Water Development Authority (Water Pollution Control Loan Fund); Series 2020 A, RB | 5.00% | 12/01/2050 | 1,245 | 1,611,671 | ||
| 42,752,728 | ||||||
| Oklahoma–1.93% | ||||||
| Edmond Public Works Authority; | ||||||
| Series 2017, RB(c) | 5.00% | 07/01/2042 | 2,035 | 2,471,938 | ||
| Series 2017, RB(c) | 5.00% | 07/01/2047 | 1,985 | 2,397,595 | ||
| Oklahoma (State of) Development Finance Authority (OU Medicine); Series 2018 B, RB | 5.50% | 08/15/2057 | 3,745 | 4,612,747 | ||
| Oklahoma (State of) Development Finance Authority (Provident Oklahoma Education Resources, Inc.-Cross Village Student Housing); Series 2017, RB (Acquired 12/24/2018; Cost $1,386,455)(b)(l) | 5.00% | 08/01/2052 | 1,485 | 1,084,050 | ||
| 10,566,330 | ||||||
| Oregon–0.65% | ||||||
| Clackamas (County of), OR Hospital Facility Authority (Rose Villa); Series 2020 A, Ref. RB | 5.38% | 11/15/2055 | 375 | 415,601 | ||
| University of Oregon; Series 2020, RB(c)(j) | 5.00% | 04/01/2050 | 2,500 | 3,161,681 | ||
| 3,577,282 | ||||||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Pennsylvania–2.94% | ||||||
| Allegheny (County of), PA Hospital Development Authority (Allegheny Health Network Obligated Group Issue); | ||||||
| Series 2018 A, Ref. RB | 4.00% | 04/01/2044 | $ 625 | $ 707,674 | ||
| Series 2018 A, Ref. RB | 5.00% | 04/01/2047 | 1,000 | 1,210,046 | ||
| Coatesville School District; Series 2020 A, GO Bonds (INS - BAM)(f)(g) | 0.00% | 10/01/2036 | 500 | 300,419 | ||
| Franklin (County of), PA Industrial Development Authority (Menno-Haven, Inc.); Series 2018, Ref. RB | 5.00% | 12/01/2025 | 500 | 561,915 | ||
| Pennsylvania (Commonwealth of) Turnpike Commission; | ||||||
| Series 2014 A, RB(k) | 4.75% | 12/01/2037 | 740 | 835,675 | ||
| Series 2018 A-2, RB | 5.00% | 12/01/2048 | 890 | 1,100,889 | ||
| Series 2018 B, RB | 5.25% | 12/01/2048 | 875 | 1,103,346 | ||
| Subseries 2014 A-2, RB(k) | 5.13% | 12/01/2039 | 1,000 | 1,075,142 | ||
| Subseries 2017 B-1, RB | 5.25% | 06/01/2047 | 1,750 | 2,154,533 | ||
| Pennsylvania (State of) Economic Development Financing Authority (UPMC); Series 2021 A, Ref. RB | 4.00% | 10/15/2040 | 600 | 726,607 | ||
| Pennsylvania (State of) Turnpike Commission; | ||||||
| Series 2021 A, RB | 4.00% | 12/01/2043 | 340 | 403,924 | ||
| Series 2021 A, RB | 4.00% | 12/01/2044 | 375 | 443,676 | ||
| Philadelphia (City of), PA; | ||||||
| Series 2017 A, RB | 5.00% | 10/01/2052 | 840 | 1,020,905 | ||
| Series 2017 B, Ref. RB(e) | 5.00% | 07/01/2047 | 2,190 | 2,640,954 | ||
| Philadelphia (City of), PA Authority for Industrial Development (String Theory Charter School); | ||||||
| Series 2020, Ref. RB(d) | 5.00% | 06/15/2040 | 110 | 129,739 | ||
| Series 2020, Ref. RB(d) | 5.00% | 06/15/2050 | 210 | 244,292 | ||
| Philadelphia (City of), PA Industrial Development Authority (Thomas Jefferson University); | ||||||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2035 | 545 | 659,172 | ||
| Series 2017 A, Ref. RB | 5.00% | 09/01/2047 | 645 | 766,048 | ||
| 16,084,956 | ||||||
| Puerto Rico–5.22% | ||||||
| Children’s Trust Fund; | ||||||
| Series 2002, RB | 5.50% | 05/15/2039 | 2,575 | 2,636,491 | ||
| Series 2002, RB | 5.63% | 05/15/2043 | 1,110 | 1,115,769 | ||
| Series 2005 A, RB(g) | 0.00% | 05/15/2050 | 4,515 | 709,326 | ||
| Series 2005 B, RB(g) | 0.00% | 05/15/2055 | 2,000 | 178,370 | ||
| Series 2008 A, RB(g) | 0.00% | 05/15/2057 | 11,190 | 746,800 | ||
| Series 2008 B, RB(g) | 0.00% | 05/15/2057 | 18,675 | 977,638 | ||
| Puerto Rico (Commonwealth of); Series 2003 C-7, Ref. GO Bonds (INS - NATL)(f) | 6.00% | 07/01/2027 | 300 | 309,456 | ||
| Puerto Rico (Commonwealth of) Aqueduct & Sewer Authority; | ||||||
| Series 2012 A, RB | 5.00% | 07/01/2033 | 130 | 137,201 | ||
| Series 2012 A, RB | 5.13% | 07/01/2037 | 1,185 | 1,252,400 | ||
| Puerto Rico (Commonwealth of) Electric Power Authority; | ||||||
| Series 2007 VV, Ref. RB (INS - NATL)(f) | 5.25% | 07/01/2032 | 1,440 | 1,554,904 | ||
| Series 2007 VV, Ref. RB (INS - NATL)(f) | 5.25% | 07/01/2033 | 550 | 593,900 | ||
| Series 2007 VV, Ref. RB (INS - NATL)(f) | 5.25% | 07/01/2035 | 480 | 518,331 | ||
| Puerto Rico (Commonwealth of) Highway & Transportation Authority; | ||||||
| Series 1998 A, RB (INS - NATL)(f) | 4.75% | 07/01/2038 | 500 | 507,667 | ||
| Series 2007 CC, Ref. RB (INS - AGM)(f) | 5.25% | 07/01/2033 | 920 | 1,044,268 | ||
| Series 2007 N, Ref. RB (INS - NATL)(f) | 5.25% | 07/01/2032 | 575 | 627,722 | ||
| Series 2007 N, Ref. RB (INS - AGC)(f) | 5.25% | 07/01/2034 | 900 | 1,010,548 | ||
| Series 2007 N, Ref. RB (INS - AGC)(f) | 5.25% | 07/01/2036 | 800 | 872,365 | ||
| Puerto Rico (Commonwealth of) Public Buildings Authority (Government Facilities); Series 2007 M-3, Ref. RB (INS - NATL)(f) | 6.00% | 07/01/2024 | 1,510 | 1,552,824 | ||
| 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 | $ 335 | $ 301,092 | ||
| Series 2018 A-1, RB(g) | 0.00% | 07/01/2029 | 785 | 668,912 | ||
| Series 2018 A-1, RB(g) | 0.00% | 07/01/2031 | 1,830 | 1,442,664 | ||
| Series 2018 A-1, RB(g) | 0.00% | 07/01/2033 | 650 | 474,740 | ||
| Series 2018 A-1, RB(g) | 0.00% | 07/01/2046 | 3,745 | 1,219,260 | ||
| Series 2018 A-1, RB(g) | 0.00% | 07/01/2051 | 11,375 | 2,689,996 | ||
| Series 2018 A-1, RB | 4.75% | 07/01/2053 | 1,015 | 1,141,026 | ||
| Series 2018 A-1, RB | 5.00% | 07/01/2058 | 2,965 | 3,382,488 | ||
| Series 2019 A-2, RB | 4.33% | 07/01/2040 | 815 | 904,265 | ||
| 28,570,423 | ||||||
| Rhode Island–0.11% | ||||||
| Tobacco Settlement Financing Corp.; Series 2015 A, Ref. RB | 5.00% | 06/01/2035 | 530 | 602,592 | ||
| South Carolina–1.22% | ||||||
| South Carolina (State of) Jobs-Economic Development Authority (Palmetto Health Alliance); Series 2013 A, Ref. RB(h)(i) | 5.25% | 08/01/2023 | 1,200 | 1,331,333 | ||
| South Carolina (State of) Ports Authority; | ||||||
| Series 2015, RB(e)(h)(i) | 5.25% | 07/01/2025 | 2,620 | 3,117,365 | ||
| Series 2015, RB(e)(h)(i) | 5.25% | 07/01/2025 | 180 | 214,170 | ||
| Series 2015, RB(e)(h)(i) | 5.25% | 07/01/2025 | 850 | 1,011,359 | ||
| South Carolina (State of) Public Service Authority; Series 2014, Ref. RB | 5.00% | 12/01/2046 | 890 | 1,016,277 | ||
| 6,690,504 | ||||||
| South Dakota–0.49% | ||||||
| South Dakota (State of) Health & Educational Facilities Authority (Sanford Obligated Group); | ||||||
| Series 2014 B, RB | 5.00% | 11/01/2044 | 1,235 | 1,405,513 | ||
| Series 2015, Ref. RB | 5.00% | 11/01/2045 | 1,100 | 1,280,010 | ||
| 2,685,523 | ||||||
| Tennessee–2.69% | ||||||
| Greeneville (Town of), TN Health & Educational Facilities Board (Ballad Health Obligated Group); Series 2018 A, Ref. RB | 5.00% | 07/01/2036 | 1,295 | 1,595,841 | ||
| Johnson City (City of), TN Health & Educational Facilities Board (Mountain States Health Alliance); Series 2000 A, Ref. RB (INS - NATL)(f)(g) | 0.00% | 07/01/2026 | 12,525 | 11,630,041 | ||
| Nashville (City of) & Davidson (County of), TN Metropolitan Government Health & Educational Facilities Board (Lipscomb University); Series 2019 A, Ref. RB | 5.00% | 10/01/2034 | 715 | 871,431 | ||
| Nashville (City of), TN Metropolitan Airport Authority; Series 2019 B, RB(e) | 5.00% | 07/01/2049 | 490 | 609,668 | ||
| 14,706,981 | ||||||
| Texas–15.16% | ||||||
| Austin (City of), TX; Series 2012, Ref. RB | 5.00% | 11/15/2042 | 1,600 | 1,705,958 | ||
| Board of Regents of the University of Texas System; Series 2020 A, Ref. RB | 3.50% | 08/15/2050 | 1,145 | 1,439,766 | ||
| Central Texas Regional Mobility Authority; Series 2020 E, RB | 5.00% | 01/01/2045 | 530 | 663,916 | ||
| Clifton Higher Education Finance Corp. (International Leadership of Texas); Series 2018 D, RB | 5.75% | 08/15/2033 | 1,250 | 1,460,005 | ||
| Dallas-Fort Worth (Cities of), TX International Airport; Series 2013 A, RB(e) | 5.00% | 11/01/2030 | 1,000 | 1,064,039 | ||
| Harris (County of), TX Metropolitan Transit Authority; Series 2011 A, RB(c)(h)(i)(j) | 5.00% | 11/01/2021 | 2,000 | 2,040,880 | ||
| Houston (City of), TX; Series 2011 D, RB(c)(h)(i) | 5.00% | 11/15/2021 | 3,150 | 3,220,436 | ||
| Houston (City of), TX (United Airlines, Inc.); Series 2018, RB(e) | 5.00% | 07/15/2028 | 375 | 450,344 | ||
| Houston (City of), TX Airport System (United Airlines, Inc. Terminal E); Series 2014, Ref. RB(e) | 4.75% | 07/01/2024 | 1,990 | 2,088,074 | ||
| La Vernia Higher Education Finance Corp. (Meridian World School); Series 2015 A, RB(d) | 5.50% | 08/15/2045 | 1,015 | 1,109,106 | ||
| Lower Colorado River Authority; | ||||||
| Series 2012 A, Ref. RB | 5.00% | 05/15/2039 | 2,270 | 2,364,663 | ||
| Series 2012-A, Ref. RB(h)(i) | 5.00% | 05/15/2022 | 5 | 5,227 | ||
| Matagorda (County of), TX Navigation District No. 1 (Houston Lighting & Power Co.); Series 1997, Ref. RB (INS - AMBAC)(e)(f) | 5.13% | 11/01/2028 | 5,000 | 6,319,223 | ||
| Mission Economic Development Corp. (Natgasoline); Series 2018, Ref. RB(d)(e) | 4.63% | 10/01/2031 | 2,305 | 2,443,852 | ||
| New Hope Cultural Education Facilities Corp. (Presbyterian Village North); | ||||||
| Series 2018, Ref. RB | 5.00% | 10/01/2027 | 175 | 193,495 | ||
| Series 2018, Ref. RB | 5.00% | 10/01/2028 | 1,000 | 1,099,644 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Texas–(continued) | ||||||
| New Hope Cultural Education Facilities Finance Corp. (4-K Housing, Inc.-Stoney Brook); Series 2017 B, RB | 5.00% | 07/01/2047 | $ 1,000 | $ 681,677 | ||
| New Hope Cultural Education Facilities Finance Corp. (Carillon Lifecare Community); Series 2016, Ref. RB | 5.00% | 07/01/2046 | 1,080 | 1,105,719 | ||
| New Hope Cultural Education Facilities Finance Corp. (CHF-Collegiate Housing College Station I, LLC - Texas A&M University); Series 2014 A, RB (INS - AGM)(f) | 5.00% | 04/01/2046 | 2,505 | 2,784,458 | ||
| New Hope Cultural Education Facilities Finance Corp. (Forefront Living Plano); Series 2020 A, RB(d) | 10.00% | 12/01/2025 | 195 | 206,819 | ||
| New Hope Cultural Education Facilities Finance Corp. (Longhorn Village); | ||||||
| Series 2017, Ref. RB | 5.00% | 01/01/2042 | 370 | 399,869 | ||
| Series 2017, Ref. RB | 5.00% | 01/01/2047 | 460 | 495,931 | ||
| New Hope Cultural Education Facilities Finance Corp. (Presbyterian Village North); Series 2020, RB | 5.25% | 10/01/2055 | 1,870 | 2,029,923 | ||
| North Texas Tollway Authority; | ||||||
| Series 2011 A, RB(h)(i) | 5.50% | 09/01/2021 | 3,180 | 3,222,351 | ||
| Series 2015 B, Ref. RB(c)(j) | 5.00% | 01/01/2040 | 7,525 | 8,062,654 | ||
| San Antonio (City of), TX; | ||||||
| Series 2013, RB(h)(i) | 5.00% | 02/01/2023 | 2,000 | 2,157,636 | ||
| Series 2021 A, RB | 5.00% | 02/01/2049 | 1,000 | 1,288,537 | ||
| Tarrant County Cultural Education Facilities Finance Corp.; Series 2016 A, Ref. RB(c) | 5.00% | 02/15/2047 | 2,585 | 3,093,561 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (Air Force Village Obligated Group); | ||||||
| Series 2016, Ref. RB | 5.00% | 05/15/2037 | 1,610 | 1,745,107 | ||
| Series 2016, Ref. RB | 5.00% | 05/15/2045 | 755 | 811,629 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (Buckingham Senior Living Community, Inc.); | ||||||
| Series 2007, RB (Acquired 07/27/2007; Cost $1,000,000)(b)(l) | 5.63% | 11/15/2027 | 1,000 | 450,000 | ||
| Series 2007, RB (Acquired 12/07/2007; Cost $527,418)(b)(l) | 5.75% | 11/16/2037 | 585 | 263,250 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (C.C. Young Memorial Home); | ||||||
| Series 2007, RB | 5.75% | 02/15/2025 | 335 | 272,194 | ||
| Series 2017 A, RB (Acquired 12/15/2016; Cost $1,504,423)(l) | 6.38% | 02/15/2048 | 1,490 | 1,220,401 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (MRC Stevenson Oaks); | ||||||
| Series 2020, Ref. RB | 6.63% | 11/15/2041 | 60 | 69,191 | ||
| Series 2020, Ref. RB | 6.75% | 11/15/2051 | 60 | 68,910 | ||
| Series 2020, Ref. RB | 6.88% | 11/15/2055 | 60 | 69,180 | ||
| Tarrant County Cultural Education Facilities Finance Corp. (Texas Health Resources System); Series 2016 A, Ref. RB | 5.00% | 02/15/2041 | 3,210 | 3,852,320 | ||
| Texas (State of) Transportation Commission; | ||||||
| Series 2016 A, GO Bonds | 5.00% | 04/01/2044 | 1,290 | 1,533,573 | ||
| Series 2019, RB(g) | 0.00% | 08/01/2040 | 1,500 | 725,132 | ||
| Texas (State of) Transportation Commission (Central Texas Turnpike System); | ||||||
| Series 2012 A, Ref. RB(h)(i) | 5.00% | 08/15/2022 | 3,310 | 3,505,323 | ||
| Series 2015 B, Ref. RB(g) | 0.00% | 08/15/2036 | 2,650 | 1,517,598 | ||
| Series 2015 B, Ref. RB(g) | 0.00% | 08/15/2037 | 955 | 522,157 | ||
| Series 2015 C, Ref. RB | 5.00% | 08/15/2042 | 2,980 | 3,317,029 | ||
| Texas (State of) Water Development Board (State Water Implementation Revenue Fund); Series 2017 A, RB | 4.00% | 10/15/2035 | 210 | 248,789 | ||
| Texas Municipal Gas Acquisition & Supply Corp. I; Series 2008 D, RB | 6.25% | 12/15/2026 | 3,960 | 4,643,676 | ||
| Texas Private Activity Bond Surface Transportation Corp. (Blueridge Transportation Group, LLC SH 288 Toll Lanes); Series 2016, RB(e) | 5.00% | 12/31/2055 | 870 | 978,736 | ||
| Texas Private Activity Bond Surface Transportation Corp. (NTE Mobility Partners Segments 3 LLC Segments 3A and 3B Facility); Series 2013, RB(e) | 7.00% | 12/31/2038 | 1,150 | 1,312,911 | ||
| Texas Private Activity Bond Surface Transportation Corp. (Segment 3C); Series 2019, RB(e) | 5.00% | 06/30/2058 | 1,780 | 2,184,203 | ||
| Travis County Cultural Education Facilities Finance Corp. (Wayside Schools); Series 2012 A, RB | 5.25% | 08/15/2042 | 410 | 412,792 | ||
| 82,921,864 | ||||||
| Utah–1.21% | ||||||
| Salt Lake (City of), UT; | ||||||
| Series 2017 A, RB(c)(e) | 5.00% | 07/01/2047 | 2,065 | 2,488,880 | ||
| Series 2018 A, RB(e) | 5.00% | 07/01/2048 | 885 | 1,071,675 | ||
| Series 2018 A, RB(e) | 5.25% | 07/01/2048 | 1,185 | 1,454,558 | ||
| Utah (County of), UT; Series 2016 B, RB(c) | 4.00% | 05/15/2047 | 1,515 | 1,622,711 | ||
| 6,637,824 | ||||||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Virgin Islands–0.25% | ||||||
| Virgin Islands (Government of) Public Finance Authority (Matching Fund Loan Note); | ||||||
| Series 2010 A, RB | 5.00% | 10/01/2025 | $ 475 | $ 476,073 | ||
| Series 2010 A, RB | 5.00% | 10/01/2029 | 890 | 892,010 | ||
| 1,368,083 | ||||||
| Virginia–2.43% | ||||||
| Roanoke (City of), VA Economic Development Authority (Carilion Clinic Obligated Group); Series 2020, Ref. RB | 5.00% | 07/01/2047 | 935 | 1,432,975 | ||
| Roanoke (City of), VA Economic Development Authority (Richfield Living); Series 2020, RB | 5.00% | 09/01/2050 | 245 | 239,096 | ||
| Virginia (Commonwealth of) Small Business Financing Authority (95 Express Lanes LLC); | ||||||
| Series 2017, RB(e) | 5.00% | 01/01/2040 | 280 | 287,377 | ||
| Series 2019, RB(e) | 5.00% | 01/01/2044 | 1,480 | 1,518,643 | ||
| Virginia (Commonwealth of) Small Business Financing Authority (Elizabeth River Crossings Opco, LLC); | ||||||
| Series 2012, RB(e) | 6.00% | 01/01/2037 | 680 | 719,639 | ||
| Series 2012, RB(e) | 5.50% | 01/01/2042 | 2,705 | 2,843,604 | ||
| Virginia (Commonwealth of) Small Business Financing Authority (Express Lanes, LLC); Series 2012, RB(e) | 5.00% | 07/01/2034 | 2,735 | 2,807,576 | ||
| Virginia (Commonwealth of) Small Business Financing Authority (Transform 66 P3); | ||||||
| Series 2017, RB(e) | 5.00% | 12/31/2049 | 610 | 735,145 | ||
| Series 2017, RB(e) | 5.00% | 12/31/2052 | 1,285 | 1,546,139 | ||
| Virginia (Commonwealth of) Transportation Board; Series 2017, RB | 4.00% | 05/15/2042 | 1,000 | 1,151,677 | ||
| 13,281,871 | ||||||
| Washington–4.39% | ||||||
| Chelan (County of), WA Public Utility District No. 1; Series 2011 A, Ref. RB(e) | 5.50% | 07/01/2025 | 1,675 | 1,681,904 | ||
| Kalispel Tribe of Indians; Series 2018 B, RB(d) | 5.00% | 01/01/2032 | 700 | 821,328 | ||
| King (County of), WA; Series 2020 A, Ref. RB | 4.00% | 01/01/2052 | 2,250 | 2,661,167 | ||
| Seattle (Port of), WA; Series 2012 A, Ref. RB | 5.00% | 08/01/2030 | 2,265 | 2,391,853 | ||
| Washington (State of); Series 2019 A, GO Bonds(c) | 5.00% | 08/01/2042 | 1,400 | 1,761,238 | ||
| Washington (State of) (SR 520 Corridor Program –Toll Revenue); | ||||||
| Series 2011 C, GO Bonds(c)(h)(i) | 5.00% | 06/01/2021 | 2,700 | 2,700,000 | ||
| Series 2011 C, GO Bonds(c)(h)(i) | 5.00% | 06/01/2021 | 645 | 645,000 | ||
| Washington (State of) Convention Center Public Facilities District; | ||||||
| Series 2018, RB | 5.00% | 07/01/2043 | 875 | 1,060,245 | ||
| Series 2018, RB(c)(j) | 5.00% | 07/01/2048 | 3,130 | 3,780,975 | ||
| Series 2018, RB | 5.00% | 07/01/2048 | 625 | 741,309 | ||
| Washington (State of) Health Care Facilities Authority; Series 2019 A-2, Ref. RB(c)(j) | 5.00% | 08/01/2044 | 2,710 | 3,343,813 | ||
| Washington (State of) Housing Finance Commission (Bayview Manor Homes); | ||||||
| Series 2016 A, Ref. RB(d) | 5.00% | 07/01/2046 | 325 | 344,656 | ||
| Series 2016 A, Ref. RB(d) | 5.00% | 07/01/2051 | 270 | 285,922 | ||
| Washington (State of) Tobacco Settlement Authority; Series 2013, Ref. RB | 5.25% | 06/01/2033 | 1,700 | 1,777,779 | ||
| 23,997,189 | ||||||
| West Virginia–0.13% | ||||||
| Monongalia (County of), WV Commission Special District (University Town Centre Economic Opportunity Development District); Series 2020, Ref. RB(d) | 7.50% | 06/01/2043 | 625 | 693,596 | ||
| Wisconsin–4.33% | ||||||
| Public Finance Authority (American Dream at Meadowlands); | ||||||
| Series 2017, RB(d) | 6.75% | 08/01/2031 | 685 | 766,792 | ||
| Series 2017, RB(d) | 6.75% | 12/01/2042 | 1,595 | 1,829,059 | ||
| Public Finance Authority (KU Campus Development Corp.); Series 2016, RB(c)(j) | 5.00% | 03/01/2046 | 2,880 | 3,393,467 | ||
| Public Finance Authority (Mallard Creek Stem Academy); Series 2019 A, RB(d) | 5.13% | 06/15/2039 | 465 | 509,951 | ||
| Superior (City of), WI (Superior Water, Light & Power Co.); | ||||||
| Series 2007 A, Ref. RB(e) | 5.38% | 11/01/2021 | 500 | 501,863 | ||
| Series 2007 B, RB(e) | 5.75% | 11/01/2037 | 460 | 461,839 | ||
| Wisconsin (State of) Center District; | ||||||
| Series 2020 D, RB (INS - AGM)(f)(g) | 0.00% | 12/15/2055 | 4,730 | 1,362,400 | ||
| Series 2020 D, RB (INS - AGM)(f)(g) | 0.00% | 12/15/2060 | 18,280 | 4,180,908 | ||
| Wisconsin (State of) Health & Educational Facilities Authority (Mercy Alliance); Series 2012, RB | 5.00% | 06/01/2024 | 4,565 | 4,778,301 | ||
| Interest Rate | Maturity Date | Principal Amount (000) | Value | |||
| Wisconsin–(continued) | ||||||
| Wisconsin (State of) Health & Educational Facilities Authority (Ministry Health Care); Series 2012 C, Ref. RB(h)(i) | 5.00% | 08/15/2022 | $ 1,400 | $ 1,481,737 | ||
| Wisconsin (State of) Public Finance Authority (Explore Academy); Series 2020 A, RB(d) | 6.13% | 02/01/2050 | 310 | 342,752 | ||
| Wisconsin (State of) Public Finance Authority (Maryland Proton Treatment Center); Series 2018 A-1, RB(d) | 6.38% | 01/01/2048 | 490 | 411,457 | ||
| Wisconsin (State of) Public Finance Authority (Prime Healthcare Foundation, Inc.); | ||||||
| Series 2018 A, RB | 5.20% | 12/01/2037 | 1,255 | 1,433,713 | ||
| Series 2018 A, RB | 5.35% | 12/01/2045 | 1,255 | 1,425,704 | ||
| Wisconsin (State of) Public Finance Authority (Roseman University of Health Sciences); Series 2015, Ref. RB | 5.75% | 04/01/2035 | 670 | 775,058 | ||
| 23,655,001 | ||||||
| Wyoming–0.38% | ||||||
| Wyoming (State of) Municipal Power Agency; Series 2017 A, Ref. RB(c)(h)(i) | 5.00% | 01/01/2027 | 1,675 | 2,071,610 | ||
| TOTAL INVESTMENTS IN SECURITIES(r)–163.27% (Cost $820,590,076) | 892,957,469 | |||||
| FLOATING RATE NOTE OBLIGATIONS–(24.64)% | ||||||
| Notes with interest and fee rates ranging from 0.57% to 0.85% at 05/31/2021 and contractual maturities of collateral ranging from 09/01/2022 to 04/01/2056(s) | (134,760,000) | |||||
| VARIABLE RATE MUNI TERM PREFERRED SHARES–(39.49)% | (216,000,000) | |||||
| OTHER ASSETS LESS LIABILITIES–0.86% | 4,718,113 | |||||
| NET ASSETS APPLICABLE TO COMMON SHARES–100.00% | $546,915,582 | |||||
| AGC | – Assured Guaranty Corp. |
| AGM | – Assured Guaranty Municipal Corp. |
| AMBAC | – American Municipal Bond Assurance Corp. |
| BAM | – Build America Mutual Assurance Co. |
| CEP | – Credit Enhancement Provider |
| 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 |
| RB | – Revenue Bonds |
| Ref. | – Refunding |
| RN | – Revenue Notes |
| SIFMA | – Securities Industry and Financial Markets Association |
| VRD | – Variable Rate Demand |
| (a) | Calculated as a percentage of net assets. Amounts in excess of 100% are due to the Trust’s use of leverage. |
| (b) | 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, 2021 was $3,780,966, which represented less than 1% of the Trust’s Net Assets. |
| (c) | Underlying security related to TOB Trusts entered into by the Trust. |
| (d) | 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, 2021 was $33,824,886, which represented 6.18% of the Trust’s Net Assets. |
| (e) | Security subject to the alternative minimum tax. |
| (f) | Principal and/or interest payments are secured by the bond insurance company listed. |
| (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) | 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 $38,597,000. However, such shortfall payment would be reduced by the proceeds from the sale of the security underlying the TOB Trusts. |
| (k) | Convertible capital appreciation bond. The interest rate shown represents the coupon rate at which the bond will accrue at a specified future date. |
| (l) | Restricted security. The aggregate value of these securities at May 31, 2021 was $4,191,298, which represented less than 1% of the Trust’s Net Assets. |
| (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) | Interest or dividend rate is redetermined periodically. Rate shown is the rate in effect on May 31, 2021. |
| (p) | Demand security payable upon demand by the Trust at specified time intervals no greater than thirteen months. Interest rate is redetermined periodically by the issuer or agent based on current market conditions. Rate shown is the rate in effect on May 31, 2021. |
| (q) | Security subject to crossover refunding. |
| (r) | This table provides a listing of those entities that have either issued, guaranteed, backed or otherwise enhanced the credit quality of more than 5% of the securities held in the portfolio. In instances where the entity has guaranteed, backed or otherwise enhanced the credit quality of a security, it is not primarily responsible for the issuer’s obligations but may be called upon to satisfy the issuer’s obligations. |
| Entity | Percent |
| Assured Guaranty Municipal Corp. | 5.19% |
| (s) | Floating rate note obligations related to securities held. The interest and fee rates shown reflect the rates in effect at May 31, 2021. At May 31, 2021, the Trust’s investments with a value of $221,804,076 are held by TOB Trusts and serve as collateral for the $134,760,000 in the floating rate note obligations outstanding at that date. |
| Level 1 | Level 2 | Level 3 | Total | |
| Investments in Securities | ||||
| Municipal Obligations | $— | $892,460,871 | $496,598 | $892,957,469 |