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 30,727 256,400 SH   SOLE   256,400 0 0
AbbVie, Inc. COM 00287Y109 26,070 240,900 SH   SOLE   240,900 0 0
Accenture plc Class A COM G1151C101 10,912 39,500 SH   SOLE   39,500 0 0
Activision Blizzard, Inc. COM 00507V109 11,718 126,000 SH   SOLE   126,000 0 0
Adams Natural Resources Fund, Inc. COM 00548F105 32,167 2,186,774 SH   SOLE   2,186,774 0 0
Adobe Inc. COM 00724F101 26,526 55,800 SH   SOLE   55,800 0 0
Air Products and Chemicals, Inc. COM 009158106 4,473 15,900 SH   SOLE   15,900 0 0
Alaska Air Group, Inc. COM 011659109 12,402 179,200 SH   SOLE   179,200 0 0
Alexion Pharmaceuticals, Inc. COM 015351109 13,945 91,200 SH   SOLE   91,200 0 0
Alphabet Inc. Class A COM 02079K305 93,638 45,400 SH   SOLE   45,400 0 0
Amazon.com, Inc. COM 023135106 98,082 31,700 SH   SOLE   31,700 0 0
AmerisourceBergen Corporation COM 03073E105 18,372 155,600 SH   SOLE   155,600 0 0
Amphenol Corporation Class A COM 032095101 14,500 219,800 SH   SOLE   219,800 0 0
Apple Inc. COM 037833100 130,139 1,065,400 SH   SOLE   1,065,400 0 0
Arista Networks, Inc. COM 040413106 13,494 44,700 SH   SOLE   44,700 0 0
AT&T Inc. COM 00206R102 7,201 237,882 SH   SOLE   237,882 0 0
Bank of America Corp. COM 060505104 44,432 1,148,400 SH   SOLE   1,148,400 0 0
Berkshire Hathaway Inc. Class B COM 084670702 43,328 169,600 SH   SOLE   169,600 0 0
Bristol-Myers Squibb Company COM 110122108 17,064 270,300 SH   SOLE   270,300 0 0
Capital One Financial Corporation COM 14040H105 23,563 185,200 SH   SOLE   185,200 0 0
Carrier Global Corporation COM 14448C104 16,576 392,600 SH   SOLE   392,600 0 0
Caterpillar Inc. COM 149123101 29,401 126,800 SH   SOLE   126,800 0 0
CBRE Group, Inc. Class A COM 12504L109 9,968 126,000 SH   SOLE   126,000 0 0
CDW Corp. COM 12514G108 11,089 66,900 SH   SOLE   66,900 0 0
Centene Corporation COM 15135B101 8,615 134,800 SH   SOLE   134,800 0 0
Chipotle Mexican Grill, Inc. COM 169656105 15,203 10,700 SH   SOLE   10,700 0 0
Cisco Systems, Inc. COM 17275R102 14,060 271,900 SH   SOLE   271,900 0 0
CMS Energy Corporation COM 125896100 11,069 180,800 SH   SOLE   180,800 0 0
Comcast Corporation Class A COM 20030N101 38,456 710,700 SH   SOLE   710,700 0 0
ConocoPhillips COM 20825C104 16,675 314,800 SH   SOLE   314,800 0 0
Constellation Brands, Inc. Class A COM 21036P108 11,947 52,400 SH   SOLE   52,400 0 0
Costco Wholesale Corporation COM 22160K105 18,681 53,000 SH   SOLE   53,000 0 0
CVS Health Corporation COM 126650100 18,943 251,800 SH   SOLE   251,800 0 0
DuPont de Nemours, Inc. COM 26614N102 13,733 177,700 SH   SOLE   177,700 0 0
Edison International COM 281020107 11,609 198,100 SH   SOLE   198,100 0 0
Edwards Lifesciences Corporation COM 28176E108 15,582 186,300 SH   SOLE   186,300 0 0
Eli Lilly and Company COM 532457108 24,660 132,000 SH   SOLE   132,000 0 0
Equinix, Inc. COM 29444U700 13,320 19,600 SH   SOLE   19,600 0 0
Facebook, Inc. Class A COM 30303M102 55,872 189,700 SH   SOLE   189,700 0 0
Fair Isaac Corporation COM 303250104 11,957 24,600 SH   SOLE   24,600 0 0
General Motors Company COM 37045V100 11,279 196,300 SH   SOLE   196,300 0 0
Hess Corporation COM 42809H107 13,501 190,800 SH   SOLE   190,800 0 0
Hilton Worldwide Holdings, Inc. COM 43300A203 13,833 114,400 SH   SOLE   114,400 0 0
Home Depot, Inc. COM 437076102 8,333 27,300 SH   SOLE   27,300 0 0
Honeywell International Inc. COM 438516106 27,742 127,800 SH   SOLE   127,800 0 0
Huntington Ingalls Industries, Inc. COM 446413106 13,174 64,000 SH   SOLE   64,000 0 0
IDEXX Laboratories, Inc. COM 45168D104 6,752 13,800 SH   SOLE   13,800 0 0
Intercontinental Exchange, Inc. COM 45866F104 10,587 94,800 SH   SOLE   94,800 0 0
Intuit Inc. COM 461202103 19,957 52,100 SH   SOLE   52,100 0 0
Johnson & Johnson COM 478160104 23,896 145,400 SH   SOLE   145,400 0 0
JPMorgan Chase & Co. COM 46625H100 45,776 300,700 SH   SOLE   300,700 0 0
Kansas City Southern COM 485170302 12,747 48,300 SH   SOLE   48,300 0 0
Knight-Swift Transportation Holdings Inc. COM 499049104 12,215 254,000 SH   SOLE   254,000 0 0
Lam Research Corporation COM 512807108 26,548 44,600 SH   SOLE   44,600 0 0
Lamb Weston Holdings, Inc. COM 513272104 17,805 229,800 SH   SOLE   229,800 0 0
Lowe's Companies, Inc. COM 548661107 15,519 81,600 SH   SOLE   81,600 0 0
LyondellBasell Industries N.V. COM N53745100 11,945 114,800 SH   SOLE   114,800 0 0
Mastercard Incorporated Class A COM 57636Q104 39,344 110,500 SH   SOLE   110,500 0 0
MetLife, Inc. COM 59156R108 31,696 521,400 SH   SOLE   521,400 0 0
Microchip Technology Incorporated COM 595017104 17,571 113,200 SH   SOLE   113,200 0 0
Micron Technology, Inc. COM 595112103 24,372 276,300 SH   SOLE   276,300 0 0
Microsoft Corporation COM 594918104 145,729 618,100 SH   SOLE   618,100 0 0
Monster Beverage Corporation COM 61174X109 14,656 160,900 SH   SOLE   160,900 0 0
Morgan Stanley COM 617446448 32,136 413,800 SH   SOLE   413,800 0 0
Netflix, Inc. COM 64110L106 13,214 25,331 SH   SOLE   25,331 0 0
NextEra Energy, Inc. COM 65339F101 9,383 124,100 SH   SOLE   124,100 0 0
NVIDIA Corporation COM 67066G104 31,021 58,100 SH   SOLE   58,100 0 0
Oracle Corporation COM 68389X105 8,575 122,200 SH   SOLE   122,200 0 0
O'Reilly Automotive, Inc. COM 67103H107 15,065 29,700 SH   SOLE   29,700 0 0
Parker-Hannifin Corporation COM 701094104 23,184 73,500 SH   SOLE   73,500 0 0
PayPal Holdings Inc. COM 70450Y103 10,248 42,200 SH   SOLE   42,200 0 0
PepsiCo, Inc. COM 713448108 11,146 78,800 SH   SOLE   78,800 0 0
Philip Morris International Inc. COM 718172109 27,483 309,700 SH   SOLE   309,700 0 0
Post Holdings, Inc. COM 737446104 12,369 117,000 SH   SOLE   117,000 0 0
Prologis, Inc. COM 74340W103 9,837 92,800 SH   SOLE   92,800 0 0
Public Service Enterprise Group Incorporated COM 744573106 14,083 233,900 SH   SOLE   233,900 0 0
QUALCOMM Incorporated COM 747525103 20,883 157,500 SH   SOLE   157,500 0 0
Raytheon Technologies Corporation COM 75513E101 16,211 209,800 SH   SOLE   209,800 0 0
Schlumberger N.V. COM 806857108 13,320 489,900 SH   SOLE   489,900 0 0
Sherwin-Williams Company COM 824348106 14,908 20,200 SH   SOLE   20,200 0 0
Simon Property Group, Inc. COM 828806109 10,455 91,900 SH   SOLE   91,900 0 0
Southern Company COM 842587107 13,849 222,800 SH   SOLE   222,800 0 0
Steel Dynamics, Inc. COM 858119100 11,939 235,200 SH   SOLE   235,200 0 0
T. Rowe Price Group COM 74144T108 18,310 106,700 SH   SOLE   106,700 0 0
Target Corporation COM 87612E106 28,582 144,300 SH   SOLE   144,300 0 0
Tesla Motors, Inc. COM 88160R101 24,446 36,600 SH   SOLE   36,600 0 0
Boeing Company COM 097023105 24,912 97,800 SH   SOLE   97,800 0 0
Coca-Cola Company COM 191216100 14,137 268,200 SH   SOLE   268,200 0 0
Procter & Gamble Company COM 742718109 15,622 115,350 SH   SOLE   115,350 0 0
Walt Disney Company COM 254687106 24,486 132,700 SH   SOLE   132,700 0 0
Thermo Fisher Scientific Inc. COM 883556102 40,618 89,000 SH   SOLE   89,000 0 0
TJX Companies, Inc. COM 872540109 18,568 280,700 SH   SOLE   280,700 0 0
T-Mobile US, Inc. COM 872590104 12,717 101,500 SH   SOLE   101,500 0 0
Ulta Beauty, Inc. COM 90384S303 11,656 37,700 SH   SOLE   37,700 0 0
Union Pacific Corporation COM 907818108 11,395 51,700 SH   SOLE   51,700 0 0
United Rentals, Inc. COM 911363109 14,424 43,800 SH   SOLE   43,800 0 0
UnitedHealth Group Incorporated COM 91324P102 49,150 132,100 SH   SOLE   132,100 0 0
V.F. Corporation COM 918204108 14,977 187,400 SH   SOLE   187,400 0 0
Vertex Pharmaceuticals Incorporated COM 92532F100 15,300 71,200 SH   SOLE   71,200 0 0
Visa Inc. Class A COM 92826C839 40,144 189,600 SH   SOLE   189,600 0 0
Wells Fargo & Company COM 949746101 26,009 665,700 SH   SOLE   665,700 0 0
Weyerhaeuser Company COM 962166104 10,420 292,700 SH   SOLE   292,700 0 0