The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number: 3235-0006
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COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
Abbott Laboratories COM 002824100 28,073 256,400 SH   SOLE   256,400 0 0
AbbVie, Inc. COM 00287Y109 25,812 240,900 SH   SOLE   240,900 0 0
Accenture plc Class A COM G1151C101 10,318 39,500 SH   SOLE   39,500 0 0
Adams Natural Resources Fund, Inc. COM 00548F105 24,864 2,186,774 SH   SOLE   2,186,774 0 0
Adobe Inc. COM 00724F101 35,258 70,500 SH   SOLE   70,500 0 0
Alexion Pharmaceuticals, Inc. COM 015351109 14,249 91,200 SH   SOLE   91,200 0 0
Alliant Energy Corporation COM 018802108 8,348 162,000 SH   SOLE   162,000 0 0
Alphabet Inc. Class A COM 02079K305 70,281 40,100 SH   SOLE   40,100 0 0
Amazon.com, Inc. COM 023135106 109,433 33,600 SH   SOLE   33,600 0 0
American Tower Corporation COM 03027X100 11,941 53,200 SH   SOLE   53,200 0 0
AmerisourceBergen Corporation COM 03073E105 15,211 155,600 SH   SOLE   155,600 0 0
Amphenol Corporation Class A COM 032095101 10,945 83,700 SH   SOLE   83,700 0 0
Apple Inc. COM 037833100 153,695 1,158,300 SH   SOLE   1,158,300 0 0
AT&T Inc. COM 00206R102 6,841 237,882 SH   SOLE   237,882 0 0
Bank of America Corp. COM 060505104 37,639 1,241,800 SH   SOLE   1,241,800 0 0
Berkshire Hathaway Inc. Class B COM 084670702 19,106 82,400 SH   SOLE   82,400 0 0
Bristol-Myers Squibb Company COM 110122108 23,633 381,000 SH   SOLE   381,000 0 0
Capital One Financial Corporation COM 14040H105 25,810 261,100 SH   SOLE   261,100 0 0
Carrier Global Corporation COM 14448C104 18,600 493,100 SH   SOLE   493,100 0 0
Caterpillar Inc. COM 149123101 23,080 126,800 SH   SOLE   126,800 0 0
CBRE Group, Inc. Class A COM 12504L109 8,862 141,300 SH   SOLE   141,300 0 0
CDW Corp. COM 12514G108 8,817 66,900 SH   SOLE   66,900 0 0
Centene Corporation COM 15135B101 13,897 231,500 SH   SOLE   231,500 0 0
Charter Communications, Inc. Class A COM 16119P108 15,480 23,400 SH   SOLE   23,400 0 0
Chevron Corporation COM 166764100 13,436 159,100 SH   SOLE   159,100 0 0
Chipotle Mexican Grill, Inc. COM 169656105 14,838 10,700 SH   SOLE   10,700 0 0
Cintas Corporation COM 172908105 6,680 18,900 SH   SOLE   18,900 0 0
Cisco Systems, Inc. COM 17275R102 12,168 271,900 SH   SOLE   271,900 0 0
CMS Energy Corporation COM 125896100 8,731 143,100 SH   SOLE   143,100 0 0
Comcast Corporation Class A COM 20030N101 29,134 556,000 SH   SOLE   556,000 0 0
ConocoPhillips COM 20825C104 9,206 230,200 SH   SOLE   230,200 0 0
Costco Wholesale Corporation COM 22160K105 23,963 63,600 SH   SOLE   63,600 0 0
CVS Health Corporation COM 126650100 10,873 159,200 SH   SOLE   159,200 0 0
Edwards Lifesciences Corporation COM 28176E108 16,996 186,300 SH   SOLE   186,300 0 0
Eli Lilly and Company COM 532457108 22,287 132,000 SH   SOLE   132,000 0 0
Equinix, Inc. COM 29444U700 12,284 17,200 SH   SOLE   17,200 0 0
Exxon Mobil Corporation COM 30231G102 3,574 86,700 SH   SOLE   86,700 0 0
Facebook, Inc. Class A COM 30303M102 57,855 211,800 SH   SOLE   211,800 0 0
Fidelity National Information Services, Inc. COM 31620M106 15,391 108,800 SH   SOLE   108,800 0 0
General Motors Company COM 37045V100 8,174 196,300 SH   SOLE   196,300 0 0
Hilton Worldwide Holdings, Inc. COM 43300A203 12,728 114,400 SH   SOLE   114,400 0 0
Home Depot, Inc. COM 437076102 14,423 54,300 SH   SOLE   54,300 0 0
Honeywell International Inc. COM 438516106 31,862 149,800 SH   SOLE   149,800 0 0
Intercontinental Exchange, Inc. COM 45866F104 23,819 206,600 SH   SOLE   206,600 0 0
Intuit Inc. COM 461202103 16,523 43,500 SH   SOLE   43,500 0 0
Johnson & Johnson COM 478160104 22,883 145,400 SH   SOLE   145,400 0 0
JPMorgan Chase & Co. COM 46625H100 38,210 300,700 SH   SOLE   300,700 0 0
Kansas City Southern COM 485170302 14,493 71,000 SH   SOLE   71,000 0 0
L3Harris Technologies Inc. COM 502431109 14,214 75,200 SH   SOLE   75,200 0 0
Lam Research Corporation COM 512807108 21,063 44,600 SH   SOLE   44,600 0 0
Lamb Weston Holdings, Inc. COM 513272104 12,543 159,300 SH   SOLE   159,300 0 0
Las Vegas Sands Corp. COM 517834107 10,770 180,700 SH   SOLE   180,700 0 0
Liberty SiriusXM Group Series A COM 531229409 4,673 108,200 SH   SOLE   108,200 0 0
Lincoln Electric Holdings, Inc. COM 533900106 11,892 102,300 SH   SOLE   102,300 0 0
Linde plc COM G5494J103 17,550 66,600 SH   SOLE   66,600 0 0
Lowe's Companies, Inc. COM 548661107 19,887 123,900 SH   SOLE   123,900 0 0
LyondellBasell Industries N.V. COM N53745100 12,383 135,100 SH   SOLE   135,100 0 0
Mastercard Incorporated Class A COM 57636Q104 39,442 110,500 SH   SOLE   110,500 0 0
Merck & Co., Inc. COM 58933Y105 6,806 83,200 SH   SOLE   83,200 0 0
MetLife, Inc. COM 59156R108 25,466 542,400 SH   SOLE   542,400 0 0
Microchip Technology Incorporated COM 595017104 15,634 113,200 SH   SOLE   113,200 0 0
Microsoft Corporation COM 594918104 146,664 659,400 SH   SOLE   659,400 0 0
Mondelez International, Inc. Class A COM 609207105 14,009 239,600 SH   SOLE   239,600 0 0
Morgan Stanley COM 617446448 29,379 428,700 SH   SOLE   428,700 0 0
Netflix, Inc. COM 64110L106 8,074 14,931 SH   SOLE   14,931 0 0
NextEra Energy, Inc. COM 65339F101 25,089 325,200 SH   SOLE   325,200 0 0
NVIDIA Corporation COM 67066G104 23,238 44,500 SH   SOLE   44,500 0 0
Oracle Corporation COM 68389X105 7,905 122,200 SH   SOLE   122,200 0 0
Parker-Hannifin Corporation COM 701094104 20,022 73,500 SH   SOLE   73,500 0 0
PayPal Holdings Inc. COM 70450Y103 9,883 42,200 SH   SOLE   42,200 0 0
PepsiCo, Inc. COM 713448108 16,669 112,400 SH   SOLE   112,400 0 0
Philip Morris International Inc. COM 718172109 16,633 200,900 SH   SOLE   200,900 0 0
Prologis, Inc. COM 74340W103 16,753 168,100 SH   SOLE   168,100 0 0
Public Service Enterprise Group Incorporated COM 744573106 12,628 216,600 SH   SOLE   216,600 0 0
QUALCOMM Incorporated COM 747525103 27,558 180,900 SH   SOLE   180,900 0 0
Raytheon Technologies Corporation COM 75513E101 15,003 209,800 SH   SOLE   209,800 0 0
S&P Global, Inc. COM 78409V104 12,590 38,300 SH   SOLE   38,300 0 0
salesforce.com, inc. COM 79466L302 4,562 20,500 SH   SOLE   20,500 0 0
Sherwin-Williams Company COM 824348106 14,845 20,200 SH   SOLE   20,200 0 0
Simon Property Group, Inc. COM 828806109 7,999 93,800 SH   SOLE   93,800 0 0
Skyworks Solutions, Inc. COM 83088M102 12,613 82,500 SH   SOLE   82,500 0 0
T. Rowe Price Group COM 74144T108 16,153 106,700 SH   SOLE   106,700 0 0
Target Corporation COM 87612E106 28,686 162,500 SH   SOLE   162,500 0 0
Tesla Motors, Inc. COM 88160R101 23,852 33,800 SH   SOLE   33,800 0 0
Coca-Cola Company COM 191216100 23,428 427,200 SH   SOLE   427,200 0 0
Procter & Gamble Company COM 742718109 16,050 115,350 SH   SOLE   115,350 0 0
Walt Disney Company COM 254687106 24,043 132,700 SH   SOLE   132,700 0 0
Thermo Fisher Scientific Inc. COM 883556102 41,454 89,000 SH   SOLE   89,000 0 0
TJX Companies, Inc. COM 872540109 11,719 171,600 SH   SOLE   171,600 0 0
T-Mobile US, Inc. COM 872590104 13,687 101,500 SH   SOLE   101,500 0 0
Union Pacific Corporation COM 907818108 29,651 142,400 SH   SOLE   142,400 0 0
United Rentals, Inc. COM 911363109 10,158 43,800 SH   SOLE   43,800 0 0
UnitedHealth Group Incorporated COM 91324P102 46,325 132,100 SH   SOLE   132,100 0 0
Vertex Pharmaceuticals Incorporated COM 92532F100 16,827 71,200 SH   SOLE   71,200 0 0
ViacomCBS Inc. Class B COM 92556H206 7,318 196,400 SH   SOLE   196,400 0 0
Visa Inc. Class A COM 92826C839 41,471 189,600 SH   SOLE   189,600 0 0
Walmart Inc. COM 931142103 26,005 180,400 SH   SOLE   180,400 0 0
WEC Energy Group Inc. COM 92939U106 9,166 99,600 SH   SOLE   99,600 0 0
Wells Fargo & Company COM 949746101 9,226 305,700 SH   SOLE   305,700 0 0