Basic Materials Fund SCHEDULE OF INVESTMENTS (Unaudited) March 31, 2021 Shares Value COMMON STOCKS† - 98.4% Chemicals - 42.4% Sherwin-Williams Co. 323 $ 238,377 Air Products and Chemicals, Inc. 819 230,417 Ecolab, Inc. 1,059 226,700 Dow, Inc. 3,077 196,743 DuPont de Nemours, Inc. 2,364 182,690 PPG Industries, Inc. 1,137 170,846 International Flavors & Fragrances, Inc. 1,221 170,464 LyondellBasell Industries N.V. — Class A 1,593 165,752 Linde plc 548 153,517 Celanese Corp. — Class A 795 119,099 Albemarle Corp. 796 116,304 Eastman Chemical Co. 993 109,349 FMC Corp. 984 108,840 RPM International, Inc. 1,095 100,576 Mosaic Co. 3,047 96,316 Westlake Chemical Corp. 1,061 94,206 CF Industries Holdings, Inc. 1,903 86,358 Axalta Coating Systems Ltd.* 2,545 75,281 Huntsman Corp. 2,511 72,392 Olin Corp. 1,823 69,219 Nutrien Ltd. 1,275 68,710 Sociedad Quimica y Minera de Chile S.A. ADR 1,250 66,338 Ashland Global Holdings, Inc. 747 66,311 Chemours Co. 2,246 62,686 Valvoline, Inc. 2,373 61,864 Element Solutions, Inc. 3,184 58,235 W R Grace & Co. 952 56,987 HB Fuller Co. 840 52,844 Sensient Technologies Corp. 660 51,480 Ingevity Corp.* 679 51,285 Total Chemicals 3,380,186 Mining - 19.1% Newmont Corp. 3,249 195,817 Freeport-McMoRan, Inc. * 5,808 191,258 Barrick Gold Corp. 6,954 137,689 Rio Tinto plc ADR 1,088 84,483 BHP Group Ltd. ADR1 1,157 80,284 Royal Gold, Inc. 709 76,303 Wheaton Precious Metals Corp. 1,989 76,000 Franco-Nevada Corp. 604 75,675 Agnico Eagle Mines Ltd. 1,279 73,939 AngloGold Ashanti Ltd. ADR 3,294 72,369 Alcoa Corp.* 2,211 71,835 Kirkland Lake Gold Ltd. 2,003 67,701 Teck Resources Ltd. — Class B 3,310 63,486 First Majestic Silver Corp.*,1 3,989 62,149 Pan American Silver Corp. 2,048 61,502 Arconic Corp.* 1,810 45,956 Livent Corp.* 2,620 45,378 Coeur Mining, Inc.* 4,475 40,409 Total Mining 1,522,233 Packaging & Containers - 12.7% Ball Corp. 1,809 153,295 Westrock Co. 2,035 105,922 Amcor plc 8,965 104,711 Crown Holdings, Inc. 1,075 104,318 Packaging Corporation of America 761 102,339 AptarGroup, Inc. 610 86,419 Berry Global Group, Inc.* 1,366 83,872 Sealed Air Corp. 1,665 76,290 Sonoco Products Co. 1,137 71,972 Graphic Packaging Holding Co. 3,479 63,179 Silgan Holdings, Inc. 1,462 61,448 Total Packaging & Containers 1,013,765 Iron & Steel - 10.6% Nucor Corp. 1,860 149,302 Vale S.A. ADR 8,563 148,825 Cleveland-Cliffs, Inc.* 4,950 99,545 Steel Dynamics, Inc. 1,912 97,053 Reliance Steel & Aluminum Co. 589 89,699 United States Steel Corp. 3,120 81,650 ArcelorMittal S.A.* 2,530 73,800 Commercial Metals Co. 1,855 57,208 Allegheny Technologies, Inc.* 2,198 46,290 Total Iron & Steel 843,372 Building Materials - 5.8% Vulcan Materials Co. 805 135,844 Martin Marietta Materials, Inc. 388 130,298 Louisiana-Pacific Corp. 1,272 70,545 Eagle Materials, Inc.* 514 69,087 Summit Materials, Inc. — Class A* 1,868 52,341 Total Building Materials 458,115 Forest Products & Paper - 2.2% International Paper Co. 2,448 132,363 Domtar Corp. 1,106 40,867 Total Forest Products & Paper 173,230 Biotechnology - 2.1% Corteva, Inc. 3,607 168,158 Household Products & Housewares - 1.4% Avery Dennison Corp. 612 112,394 Housewares - 1.4% Scotts Miracle-Gro Co. — Class A 454 111,217 Distribution & Wholesale - 0.7% Avient Corp. 1,211 57,244 Total Common Stocks (Cost $3,437,452) 7,839,914 RIGHTS† - 0.0% Chemicals - 0.0% Sociedad Quimica y Minera de Chile S.A. Expires 04/19/21* 233 723 Total Rights (Cost $423) 723 EXCHANGE-TRADED FUNDS† - 0.9% VanEck Vectors Junior Gold Miners ETF 1,708 76,877 Total Exchange-Traded Funds (Cost $77,541) 76,877 Basic Materials Fund SCHEDULE OF INVESTMENTS (Unaudited) March 31, 2021 Face Amount Value REPURCHASE AGREEMENTS††,2 - 0.7% J.P. Morgan Securities LLC issued 03/31/21 at 0.01% due 04/01/21 $ 27,734 $ 27,734 Barclays Capital, Inc. issued 03/31/21 at 0.01% due 04/01/21 12,609 12,609 BofA Securities, Inc. issued 03/31/21 at 0.01% due 04/01/21 11,508 11,508 Total Repurchase Agreements (Cost $51,851) 51,851 Shares SECURITIES LENDING COLLATERAL†,3 - 1.1% Money Market Fund First American Government Obligations Fund — Class Z, 0.03%4 86,527 86,527 Total Securities Lending Collateral (Cost $86,527) 86,527 Total Investments - 101.1% (Cost $3,653,794) $ 8,055,892 Other Assets & Liabilities, net - (1.1)% (89,009) Total Net Assets - 100.0% $ 7,966,883 * Non-income producing security. † Value determined based on Level 1 inputs. †† Value determined based on Level 2 inputs. 1 All or a portion of this security is on loan at March 31, 2021. 2 Repurchase Agreements. 3 Securities lending collateral. 4 Rate indicated is the 7-day yield as of March 31, 2021. ADR — American Depositary Receipt plc — Public Limited Company .