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
Estimated average burden
hours per response: 23.8
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
Advance Auto Parts, Inc. COM 00751Y106 21,058 125,100 SH   SOLE   125,100 0 0
Apple Inc. COM 037833100 77,971 345,400 SH   SOLE   345,400 0 0
Abbott Laboratories COM 002824100 30,936 421,700 SH   SOLE   421,700 0 0
Accenture plc Class A COM G1151C101 26,789 157,400 SH   SOLE   157,400 0 0
Adobe Systems Incorporated COM 00724F101 31,638 117,200 SH   SOLE   117,200 0 0
Aflac Incorporated COM 001055102 14,888 316,300 SH   SOLE   316,300 0 0
Alaska Air Group, Inc. COM 011659109 9,661 140,300 SH   SOLE   140,300 0 0
Alexion Pharmaceuticals, Inc. COM 015351109 14,902 107,200 SH   SOLE   107,200 0 0
American Tower Corporation COM 03027X100 12,481 85,900 SH   SOLE   85,900 0 0
Amazon.com, Inc. COM 023135106 85,728 42,800 SH   SOLE   42,800 0 0
Andeavor COM 03349M105 10,438 68,000 SH   SOLE   68,000 0 0
Air Products and Chemicals, Inc. COM 009158106 7,668 45,900 SH   SOLE   45,900 0 0
Boeing Company COM 097023105 37,636 101,200 SH   SOLE   101,200 0 0
Bank of America Corp. COM 060505104 43,318 1,470,400 SH   SOLE   1,470,400 0 0
Becton, Dickinson and Company COM 075887109 25,526 97,800 SH   SOLE   97,800 0 0
Biogen Inc. COM 09062X103 17,277 48,900 SH   SOLE   48,900 0 0
BlackRock, Inc. COM 09247X101 19,513 41,400 SH   SOLE   41,400 0 0
Ball Corporation COM 058498106 7,738 175,900 SH   SOLE   175,900 0 0
Berkshire Hathaway Inc. Class B COM 084670702 47,832 223,400 SH   SOLE   223,400 0 0
Caterpillar Inc. COM 149123101 14,944 98,000 SH   SOLE   98,000 0 0
Comcast Corporation Class A COM 20030N101 10,127 286,000 SH   SOLE   286,000 0 0
Chipotle Mexican Grill, Inc. COM 169656105 11,636 25,600 SH   SOLE   25,600 0 0
Costco Wholesale Corporation COM 22160K105 18,297 77,900 SH   SOLE   77,900 0 0
salesforce.com, inc. COM 79466L302 28,816 181,200 SH   SOLE   181,200 0 0
Cisco Systems, Inc. COM 17275R102 30,421 625,300 SH   SOLE   625,300 0 0
Cintas Corporation COM 172908105 11,671 59,000 SH   SOLE   59,000 0 0
Delta Air Lines, Inc. COM 247361702 12,503 216,200 SH   SOLE   216,200 0 0
Dollar General Corporation COM 256677105 21,197 193,937 SH   SOLE   193,937 0 0
Walt Disney Company COM 254687106 8,045 68,800 SH   SOLE   68,800 0 0
DowDuPont Inc. COM 26078J100 13,286 206,600 SH   SOLE   206,600 0 0
Emerson Electric Co. COM 291011104 19,742 257,800 SH   SOLE   257,800 0 0
EOG Resources, Inc. COM 26875P101 13,573 106,400 SH   SOLE   106,400 0 0
Edwards Lifesciences Corporation COM 28176E108 23,242 133,500 SH   SOLE   133,500 0 0
Exelon Corporation COM 30161N101 13,067 299,300 SH   SOLE   299,300 0 0
Diamondback Energy, Inc. COM 25278X109 12,397 91,700 SH   SOLE   91,700 0 0
Facebook, Inc. Class A COM 30303M102 37,563 228,400 SH   SOLE   228,400 0 0
FedEx Corporation COM 31428X106 19,600 81,400 SH   SOLE   81,400 0 0
General Electric Company COM 369604103 2,783 246,500 SH   SOLE   246,500 0 0
Alphabet Inc. Class C COM 02079K107 30,072 25,197 SH   SOLE   25,197 0 0
Alphabet Inc. Class A COM 02079K305 37,299 30,900 SH   SOLE   30,900 0 0
Goldman Sachs Group, Inc. COM 38141G104 5,628 25,100 SH   SOLE   25,100 0 0
Home Depot, Inc. COM 437076102 35,941 173,500 SH   SOLE   173,500 0 0
Honeywell International Inc. COM 438516106 32,115 193,000 SH   SOLE   193,000 0 0
Intercontinental Exchange, Inc. COM 45866F104 28,451 379,900 SH   SOLE   379,900 0 0
Johnson & Johnson COM 478160104 19,040 137,800 SH   SOLE   137,800 0 0
JPMorgan Chase & Co. COM 46625H100 36,075 319,700 SH   SOLE   319,700 0 0
Coca-Cola Company COM 191216100 7,474 161,800 SH   SOLE   161,800 0 0
Lazard Ltd Class A COM G54050102 4,654 96,700 SH   SOLE   96,700 0 0
Lowe's Companies, Inc. COM 548661107 29,245 254,700 SH   SOLE   254,700 0 0
Southwest Airlines Co. COM 844741108 9,661 154,700 SH   SOLE   154,700 0 0
LyondellBasell Industries N.V. COM N53745100 9,605 93,700 SH   SOLE   93,700 0 0
Mastercard Incorporated Class A COM 57636Q104 32,879 147,700 SH   SOLE   147,700 0 0
Mondelez International, Inc. Class A COM 609207105 19,912 463,500 SH   SOLE   463,500 0 0
Medtronic plc COM G5960L103 24,888 253,000 SH   SOLE   253,000 0 0
Monster Beverage Corporation COM 61174X109 9,156 157,100 SH   SOLE   157,100 0 0
Marathon Petroleum Corporation COM 56585A102 7,029 87,900 SH   SOLE   87,900 0 0
Merck & Co., Inc. COM 58933Y105 34,122 481,000 SH   SOLE   481,000 0 0
Microsoft Corporation COM 594918104 95,705 836,800 SH   SOLE   836,800 0 0
NextEra Energy, Inc. COM 65339F101 16,592 99,000 SH   SOLE   99,000 0 0
Netflix, Inc. COM 64110L106 24,954 66,700 SH   SOLE   66,700 0 0
NVIDIA Corporation COM 67066G104 23,465 83,500 SH   SOLE   83,500 0 0
Oracle Corporation COM 68389X105 6,301 122,200 SH   SOLE   122,200 0 0
Occidental Petroleum Corporation COM 674599105 13,188 160,500 SH   SOLE   160,500 0 0
Public Service Enterprise Group Incorporated COM 744573106 9,180 173,900 SH   SOLE   173,900 0 0
Adams Natural Resources Fund, Inc. COM 00548F105 43,582 2,186,774 SH   SOLE   2,186,774 0 0
PepsiCo, Inc. COM 713448108 15,026 134,400 SH   SOLE   134,400 0 0
Pfizer Inc. COM 717081103 24,284 551,040 SH   SOLE   551,040 0 0
Procter & Gamble Company COM 742718109 10,974 131,850 SH   SOLE   131,850 0 0
Prologis, Inc. COM 74340W103 16,005 236,100 SH   SOLE   236,100 0 0
Philip Morris International Inc. COM 718172109 4,232 51,900 SH   SOLE   51,900 0 0
Public Storage COM 74460D109 17,360 86,100 SH   SOLE   86,100 0 0
Simon Property Group, Inc. COM 828806109 15,307 86,600 SH   SOLE   86,600 0 0
SunTrust Banks, Inc. COM 867914103 18,300 274,000 SH   SOLE   274,000 0 0
Constellation Brands, Inc. Class A COM 21036P108 13,067 60,600 SH   SOLE   60,600 0 0
AT&T Inc. COM 00206R102 23,143 689,182 SH   SOLE   689,182 0 0
Thermo Fisher Scientific Inc. COM 883556102 35,489 145,400 SH   SOLE   145,400 0 0
Tractor Supply Company COM 892356106 16,686 183,600 SH   SOLE   183,600 0 0
UnitedHealth Group Incorporated COM 91324P102 43,205 162,400 SH   SOLE   162,400 0 0
Union Pacific Corporation COM 907818108 30,482 187,200 SH   SOLE   187,200 0 0
U.S. Bancorp COM 902973304 18,420 348,800 SH   SOLE   348,800 0 0
Visa Inc. Class A COM 92826C839 48,884 325,700 SH   SOLE   325,700 0 0
WEC Energy Group Inc. COM 92939U106 11,096 166,200 SH   SOLE   166,200 0 0
Wells Fargo & Company COM 949746101 18,843 358,500 SH   SOLE   358,500 0 0
Walmart Inc. COM 931142103 24,163 257,300 SH   SOLE   257,300 0 0
Exxon Mobil Corporation COM 30231G102 14,317 168,400 SH   SOLE   168,400 0 0
Aegion Corporation COM 00770F104 655 25,800 SH   DFND   0 0 25,800
Advanced Energy Industries, Inc. COM 007973100 341 6,600 SH   DFND   0 0 6,600
American Equity Investment Life Holding Company COM 025676206 721 20,400 SH   DFND   0 0 20,400
Federal Agricultural Mortgage Corporation Class C COM 313148306 657 9,100 SH   DFND   0 0 9,100
Acadia Realty Trust COM 004239109 723 25,800 SH   DFND   0 0 25,800
ALLETE, Inc. COM 018522300 713 9,500 SH   DFND   0 0 9,500
AMAG Pharmaceuticals, Inc. COM 00163U106 370 18,500 SH   DFND   0 0 18,500
Amedisys, Inc. COM 023436108 712 5,700 SH   DFND   0 0 5,700
Amkor Technology, Inc. COM 031652100 430 58,200 SH   DFND   0 0 58,200
American Renal Associates COM 029227105 559 25,839 SH   DFND   0 0 25,839
On Assignment, Inc. COM 00191U102 663 8,400 SH   DFND   0 0 8,400
Aspen Technology, Inc. COM 045327103 968 8,500 SH   DFND   0 0 8,500
Banner Corporation COM 06652V208 727 11,700 SH   DFND   0 0 11,700
TopBuild Corp. COM 89055F103 494 8,700 SH   DFND   0 0 8,700
BioSpecifics Technologies Corp. COM 090931106 567 9,700 SH   DFND   0 0 9,700
CalAmp Corp. COM 128126109 870 36,300 SH   DFND   0 0 36,300
Cara Therapeutics Inc COM 140755109 410 17,100 SH   DFND   0 0 17,100
Cardtronics plc Class A COM G1991C105 718 22,700 SH   DFND   0 0 22,700
Continental Building Products, Inc. COM 211171103 931 24,800 SH   DFND   0 0 24,800
Cogent Communications Holdings Inc COM 19239V302 887 15,900 SH   DFND   0 0 15,900
Chemocentryx, Inc. COM 16383L106 508 40,200 SH   DFND   0 0 40,200
Cerus Corporation COM 157085101 739 102,500 SH   DFND   0 0 102,500
Costamare Inc. COM Y1771G102 588 90,600 SH   DFND   0 0 90,600
CNO Financial Group, Inc. COM 12621E103 770 36,300 SH   DFND   0 0 36,300
CyrusOne, Inc. COM 23283R100 793 12,500 SH   DFND   0 0 12,500
Cirrus Logic, Inc. COM 172755100 479 12,400 SH   DFND   0 0 12,400
Carrizo Oil & Gas, Inc. COM 144577103 491 19,500 SH   DFND   0 0 19,500
CSG Systems International, Inc. COM 126349109 666 16,600 SH   DFND   0 0 16,600
Cardiovascular Systems, Inc. COM 141619106 736 18,800 SH   DFND   0 0 18,800
Customers Bancorp, Inc. COM 23204G100 673 28,600 SH   DFND   0 0 28,600
Covanta Holding Corporation COM 22282E102 694 42,700 SH   DFND   0 0 42,700
CVR Energy, Inc. COM 12662P108 635 15,800 SH   DFND   0 0 15,800
CommVault Systems, Inc. COM 204166102 742 10,600 SH   DFND   0 0 10,600
Dana Incorporated COM 235825205 659 35,300 SH   DFND   0 0 35,300
DineEquity, Inc. COM 254423106 691 8,500 SH   DFND   0 0 8,500
Diamond Offshore Drilling, Inc. COM 25271C102 516 25,800 SH   DFND   0 0 25,800
Emergent BioSolutions Inc. COM 29089Q105 790 12,000 SH   DFND   0 0 12,000
Enterprise Financial Services Corp COM 293712105 711 13,400 SH   DFND   0 0 13,400
NIC Inc. COM 62914B100 741 50,100 SH   DFND   0 0 50,100
EMCOR Group, Inc. COM 29084Q100 638 8,500 SH   DFND   0 0 8,500
Enanta Pharmaceuticals, Inc. COM 29251M106 436 5,100 SH   DFND   0 0 5,100
EPAM Systems, Inc. COM 29414B104 799 5,800 SH   DFND   0 0 5,800
Eldorado Resorts Inc COM 28470R102 792 16,300 SH   DFND   0 0 16,300
Essent Group Ltd. COM G3198U102 708 16,000 SH   DFND   0 0 16,000
Empire State Realty Trust, Inc. Class A COM 292104106 503 30,300 SH   DFND   0 0 30,300
Ethan Allen Interiors Inc. COM 297602104 639 30,800 SH   DFND   0 0 30,800
First Bancorp COM 318910106 705 17,400 SH   DFND   0 0 17,400
First Cash Financial Services, Inc. COM 33767D105 779 9,500 SH   DFND   0 0 9,500
First Interstate BancSystem, Inc. Class A COM 32055Y201 730 16,300 SH   DFND   0 0 16,300
Greenbrier Companies, Inc. COM 393657101 992 16,500 SH   DFND   0 0 16,500
Great Southern Bancorp, Inc. COM 390905107 708 12,800 SH   DFND   0 0 12,800
Gray Television, Inc. COM 389375106 725 41,400 SH   DFND   0 0 41,400
Haemonetics Corporation COM 405024100 768 6,700 SH   DFND   0 0 6,700
Halozyme Therapeutics, Inc. COM 40637H109 507 27,900 SH   DFND   0 0 27,900
Highwoods Properties, Inc. COM 431284108 577 12,200 SH   DFND   0 0 12,200
Houlihan Lokey, Inc. Class A COM 441593100 660 14,700 SH   DFND   0 0 14,700
Heritage Insurance Holdings, Inc. COM 42727J102 627 42,300 SH   DFND   0 0 42,300
Heron Therapeutics Inc COM 427746102 513 16,200 SH   DFND   0 0 16,200
Harsco Corporation COM 415864107 759 26,600 SH   DFND   0 0 26,600
Horizon Pharma plc COM G4617B105 623 31,800 SH   DFND   0 0 31,800
Independent Bank Corporation COM 453838609 743 31,400 SH   DFND   0 0 31,400
IBERIABANK Corporation COM 450828108 732 9,000 SH   DFND   0 0 9,000
IDACORP, Inc. COM 451107106 675 6,800 SH   DFND   0 0 6,800
Ingles Markets, Incorporated Class A COM 457030104 527 15,400 SH   DFND   0 0 15,400
Inter Parfums, Inc. COM 458334109 831 12,900 SH   DFND   0 0 12,900
Integer Holdings Corporation COM 45826H109 946 11,400 SH   DFND   0 0 11,400
j2 Global, Inc. COM 48123V102 737 8,900 SH   DFND   0 0 8,900
Kaiser Aluminum Corporation COM 483007704 600 5,500 SH   DFND   0 0 5,500
KLX Inc. COM 482539103 697 11,100 SH   DFND   0 0 11,100
KLX ENERGY SERVICES HOLDINGS, INC. COM 48253L106 142 4,440 SH   DFND   0 0 4,440
Lannett Company, Inc. COM 516012101 469 98,700 SH   DFND   0 0 98,700
Ligand Pharmaceuticals Incorporated COM 53220K504 549 2,000 SH   DFND   0 0 2,000
Loxo Oncology Inc COM 548862101 512 3,000 SH   DFND   0 0 3,000
MKS Instruments, Inc. COM 55306N104 345 4,300 SH   DFND   0 0 4,300
Herman Miller, Inc. COM 600544100 714 18,600 SH   DFND   0 0 18,600
MRC Global Inc. COM 55345K103 484 25,800 SH   DFND   0 0 25,800
Matador Resources Company COM 576485205 697 21,100 SH   DFND   0 0 21,100
MGIC Investment Corporation COM 552848103 692 52,000 SH   DFND   0 0 52,000
Minerals Technologies Inc. COM 603158106 676 10,000 SH   DFND   0 0 10,000
National Health Investors, Inc. COM 63633D104 567 7,500 SH   DFND   0 0 7,500
Nelnet, Inc. Class A COM 64031N108 720 12,600 SH   DFND   0 0 12,600
National Storage Affiliates Trust COM 637870106 649 25,500 SH   DFND   0 0 25,500
Oasis Petroleum Inc. COM 674215108 590 41,600 SH   DFND   0 0 41,600
Old Second Bancorp, Inc. COM 680277100 867 56,100 SH   DFND   0 0 56,100
Phibro Animal Health Corporation Class A COM 71742Q106 438 10,200 SH   DFND   0 0 10,200
Pebblebrook Hotel Trust COM 70509V100 702 19,300 SH   DFND   0 0 19,300
Pattern Energy Group, Inc. Class A COM 70338P100 755 38,000 SH   DFND   0 0 38,000
Penn National Gaming, Inc. COM 707569109 843 25,600 SH   DFND   0 0 25,600
Perry Ellis International, Inc. COM 288853104 943 34,500 SH   DFND   0 0 34,500
PennyMac Financial Services, Inc. Class A COM 70932B101 621 29,700 SH   DFND   0 0 29,700
PennyMac Mortgage Investment Trust COM 70931T103 735 36,300 SH   DFND   0 0 36,300
PolyOne Corporation COM 73179P106 555 12,700 SH   DFND   0 0 12,700
Portland General Electric Company COM 736508847 629 13,800 SH   DFND   0 0 13,800
Progress Software Corporation COM 743312100 635 18,000 SH   DFND   0 0 18,000
Party City Holdco, Inc. COM 702149105 625 46,100 SH   DFND   0 0 46,100
QuinStreet, Inc. COM 74874Q100 759 55,900 SH   DFND   0 0 55,900
RadNet, Inc. COM 750491102 917 60,900 SH   DFND   0 0 60,900
Regis Corporation COM 758932107 725 35,500 SH   DFND   0 0 35,500
RH COM 74967X103 734 5,600 SH   DFND   0 0 5,600
RLJ Lodging Trust COM 74965L101 692 31,400 SH   DFND   0 0 31,400
Ruth's Hospitality Group, Inc. COM 783332109 1,019 32,300 SH   DFND   0 0 32,300
Rexnord Corporation COM 76169B102 742 24,100 SH   DFND   0 0 24,100
Boston Beer Company, Inc. Class A COM 100557107 546 1,900 SH   DFND   0 0 1,900
Sanmina-SCI Corporation COM 801056102 704 25,500 SH   DFND   0 0 25,500
Sinclair Broadcast Group, Inc. Class A COM 829226109 624 22,000 SH   DFND   0 0 22,000
Schnitzer Steel Industries, Inc. Class A COM 806882106 682 25,200 SH   DFND   0 0 25,200
Select Medical Holdings Corporation COM 81619Q105 648 35,200 SH   DFND   0 0 35,200
SkyWest, Inc COM 830879102 719 12,200 SH   DFND   0 0 12,200
SYNNEX Corporation COM 87162W100 567 6,700 SH   DFND   0 0 6,700
SPX Corporation COM 784635104 909 27,300 SH   DFND   0 0 27,300
Tech Data Corporation COM 878237106 558 7,800 SH   DFND   0 0 7,800
Tenet Healthcare Corporation COM 88033G407 583 20,500 SH   DFND   0 0 20,500
Tailored Brands, Inc. COM 87403A107 685 27,200 SH   DFND   0 0 27,200
TriMas Corporation COM 896215209 766 25,200 SH   DFND   0 0 25,200
Trinseo SA COM L9340P101 689 8,800 SH   DFND   0 0 8,800
Tetra Tech, Inc. COM 88162G103 731 10,700 SH   DFND   0 0 10,700
TTM Technologies, Inc. COM 87305R109 818 51,400 SH   DFND   0 0 51,400
Travelport Worldwide Ltd. COM G9019D104 631 37,400 SH   DFND   0 0 37,400
Unit Corporation COM 909218109 662 25,400 SH   DFND   0 0 25,400
Univar, Inc. COM 91336L107 675 22,000 SH   DFND   0 0 22,000
Vector Group Ltd. COM 92240M108 506 36,700 SH   DFND   0 0 36,700
Virtusa Corporation COM 92827P102 607 11,300 SH   DFND   0 0 11,300
Walker & Dunlop, Inc. COM 93148P102 814 15,400 SH   DFND   0 0 15,400
Advanced Drainage Systems Inc COM 00790R104 735 23,800 SH   DFND   0 0 23,800
Wintrust Financial Corporation COM 97650W108 629 7,400 SH   DFND   0 0 7,400
Zumiez Inc. COM 989817101 909 34,500 SH   DFND   0 0 34,500