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
AbbVie Inc. COM 00287Y109 33,767 380,000 SH   SOLE 0 380,000 0 0
Adams Natural Resources Fund, Inc. COM 00548F105 42,970 2,186,774 SH   SOLE 0 2,186,774 0 0
Adobe Systems Inc. COM 00724F101 17,484 117,200 SH   SOLE 0 117,200 0 0
Aetna Inc. COM 00817Y108 29,242 183,900 SH   SOLE 0 183,900 0 0
Albemarle Corp. COM 012653101 10,400 76,300 SH   SOLE 0 76,300 0 0
Alexion Pharmaceuticals, Inc. COM 015351109 10,297 73,400 SH   SOLE 0 73,400 0 0
Allergan plc COM G0177J108 21,949 107,096 SH   SOLE 0 107,096 0 0
Alphabet Inc. (Class A) COM 02079K305 30,088 30,900 SH   SOLE 0 30,900 0 0
Alphabet Inc. (Class C) COM 02079K107 28,387 29,597 SH   SOLE 0 29,597 0 0
Altria Group, Inc. COM 02209S103 17,333 273,300 SH   SOLE 0 273,300 0 0
Amazon.com, Inc. COM 023135106 42,396 44,100 SH   SOLE 0 44,100 0 0
American Express Co. COM 025816109 34,221 378,300 SH   SOLE 0 378,300 0 0
American Tower Corp. COM 03027X100 11,741 85,900 SH   SOLE 0 85,900 0 0
Amgen Inc. COM 031162100 21,125 113,300 SH   SOLE 0 113,300 0 0
Andeavor COM 03349M105 7,014 68,000 SH   SOLE 0 68,000 0 0
Apple Inc. COM 037833100 74,055 480,500 SH   SOLE 0 480,500 0 0
AT&T Inc. COM 00206R102 10,270 262,200 SH   SOLE 0 262,200 0 0
AvalonBay Communities, Inc. COM 053484101 9,599 53,800 SH   SOLE 0 53,800 0 0
Bank of America Corp. COM 060505104 34,756 1,371,600 SH   SOLE 0 1,371,600 0 0
Becton, Dickinson and Co. COM 075887109 12,345 63,000 SH   SOLE 0 63,000 0 0
Berkshire Hathaway Inc. (Class B) COM 084670702 12,081 65,900 SH   SOLE 0 65,900 0 0
BlackRock, Inc. COM 09247X101 18,510 41,400 SH   SOLE 0 41,400 0 0
Broadcom Ltd. COM Y09827109 19,136 78,900 SH   SOLE 0 78,900 0 0
CenterPoint Energy, Inc. COM 15189T107 11,713 401,000 SH   SOLE 0 401,000 0 0
Chubb Ltd. COM H1467J104 11,233 78,800 SH   SOLE 0 78,800 0 0
Cisco Systems, Inc. COM 17275R102 9,144 271,900 SH   SOLE 0 271,900 0 0
Citigroup Inc. COM 172967424 25,139 345,600 SH   SOLE 0 345,600 0 0
Cognizant Technology Solutions Corp. COM 192446102 14,515 200,100 SH   SOLE 0 200,100 0 0
Comcast Corp. COM 20030N101 38,826 1,009,000 SH   SOLE 0 1,009,000 0 0
Concho Resources Inc. COM 20605P101 9,602 72,900 SH   SOLE 0 72,900 0 0
Costco Wholesale Corp. COM 22160K105 7,426 45,200 SH   SOLE 0 45,200 0 0
Cummins Inc. COM 231021106 22,869 136,100 SH   SOLE 0 136,100 0 0
CVS Health Corp. COM 126650100 20,119 247,400 SH   SOLE 0 247,400 0 0
Delta Air Lines, Inc. COM 247361702 13,608 282,200 SH   SOLE 0 282,200 0 0
Dollar General Corp. COM 256677105 12,128 149,637 SH   SOLE 0 149,637 0 0
DowDuPont Inc. COM 26078J100 14,421 208,300 SH   SOLE 0 208,300 0 0
DXC Technology Co. COM 23355L106 12,281 143,000 SH   SOLE 0 143,000 0 0
Edison International COM 281020107 10,055 130,300 SH   SOLE 0 130,300 0 0
Exxon Mobil Corp. COM 30231G102 29,373 358,300 SH   SOLE 0 358,300 0 0
Facebook, Inc. COM 30303M102 46,613 272,800 SH   SOLE 0 272,800 0 0
Fortive Corp. COM 34959J108 19,800 279,700 SH   SOLE 0 279,700 0 0
General Electric Co. COM 369604103 12,346 510,600 SH   SOLE 0 510,600 0 0
Halliburton Co. COM 406216101 16,313 354,400 SH   SOLE 0 354,400 0 0
Home Depot, Inc. COM 437076102 29,016 177,400 SH   SOLE 0 177,400 0 0
Honeywell International Inc. COM 438516106 27,356 193,000 SH   SOLE 0 193,000 0 0
Industrial Select Sector SPDR Fund COM 81369Y704 10,217 143,900 SH   SOLE 0 143,900 0 0
Intercontinental Exchange, Inc. COM 45866F104 26,099 379,900 SH   SOLE 0 379,900 0 0
Johnson & Johnson COM 478160104 31,449 241,900 SH   SOLE 0 241,900 0 0
JPMorgan Chase & Co. COM 46625H100 17,020 178,200 SH   SOLE 0 178,200 0 0
Lam Research Corp. COM 512807108 15,599 84,300 SH   SOLE 0 84,300 0 0
Lowe's Companies, Inc. COM 548661107 23,854 298,400 SH   SOLE 0 298,400 0 0
LyondellBasell Industries N.V. COM N53745100 13,491 136,200 SH   SOLE 0 136,200 0 0
Magna International Inc. COM 559222401 13,452 252,000 SH   SOLE 0 252,000 0 0
MasterCard, Inc. COM 57636Q104 20,855 147,700 SH   SOLE 0 147,700 0 0
McKesson Corp. COM 58155Q103 15,499 100,900 SH   SOLE 0 100,900 0 0
Microsoft Corp. COM 594918104 62,333 836,800 SH   SOLE 0 836,800 0 0
NextEra Energy, Inc. COM 65339F101 16,384 111,800 SH   SOLE 0 111,800 0 0
Oracle Corp. COM 68389X105 5,908 122,200 SH   SOLE 0 122,200 0 0
Parker-Hannifin Corp. COM 701094104 18,097 103,400 SH   SOLE 0 103,400 0 0
PepsiCo, Inc. COM 713448108 25,673 230,400 SH   SOLE 0 230,400 0 0
Pfizer Inc. COM 717081103 25,095 702,940 SH   SOLE 0 702,940 0 0
Philip Morris International Inc. COM 718172109 32,781 295,300 SH   SOLE 0 295,300 0 0
Pioneer Natural Resources Co. COM 723787107 8,528 57,800 SH   SOLE 0 57,800 0 0
Prologis, Inc. COM 74340W103 22,313 351,600 SH   SOLE 0 351,600 0 0
Prudential Financial, Inc. COM 744320102 13,758 129,400 SH   SOLE 0 129,400 0 0
Public Services Enterprise Group Inc. COM 744573106 11,516 249,000 SH   SOLE 0 249,000 0 0
salesforce.com, inc. COM 79466L302 16,928 181,200 SH   SOLE 0 181,200 0 0
SBA Communications Corp. COM 78410G104 6,742 46,800 SH   SOLE 0 46,800 0 0
Signature Bank COM 82669G104 11,882 92,800 SH   SOLE 0 92,800 0 0
Simon Property Group, Inc. COM 828806109 12,398 77,000 SH   SOLE 0 77,000 0 0
Starbucks Corp. COM 855244109 13,497 251,300 SH   SOLE 0 251,300 0 0
SunTrust Banks, Inc. COM 867914103 22,599 378,100 SH   SOLE 0 378,100 0 0
Boeing Co. COM 097023105 29,158 114,700 SH   SOLE 0 114,700 0 0
Coca-Cola Co. COM 191216100 8,372 186,000 SH   SOLE 0 186,000 0 0
Priceline Group Inc. COM 741503403 18,857 10,300 SH   SOLE 0 10,300 0 0
Procter & Gamble Co. COM 742718109 11,996 131,850 SH   SOLE 0 131,850 0 0
Walt Disney Co. COM 254687106 11,533 117,000 SH   SOLE 0 117,000 0 0
Thermo Fisher Scientific Inc. COM 883556102 27,510 145,400 SH   SOLE 0 145,400 0 0
T-Mobile US, Inc. COM 872590104 6,055 98,200 SH   SOLE 0 98,200 0 0
Union Pacific Corp. COM 907818108 25,455 219,500 SH   SOLE 0 219,500 0 0
Verizon Communications Inc. COM 92343V104 8,492 171,600 SH   SOLE 0 171,600 0 0
Visa Inc. (Class A) COM 92826C839 33,887 322,000 SH   SOLE 0 322,000 0 0
Walmart Stores, Inc. COM 931142103 22,848 292,400 SH   SOLE 0 292,400 0 0
Waters Corp. COM 941848103 11,166 62,200 SH   SOLE 0 62,200 0 0
Wells Fargo & Co. COM 949746101 28,579 518,200 SH   SOLE 0 518,200 0 0
Acadia Realty Trust COM 004239109 798 27,900 SH   DFND 1 27,900 0 0
Advanced Energy Industries, Inc. COM 007973100 800 9,900 SH   DFND 1 9,900 0 0
Aegion Corp. COM 00770F104 903 38,800 SH   DFND 1 38,800 0 0
Akebia Therapeutics, Inc. COM 00972D105 930 47,300 SH   DFND 1 47,300 0 0
ALLETE, Inc. COM 018522300 1,105 14,300 SH   DFND 1 14,300 0 0
AMAG Pharmaceuticals Inc. COM 00163U106 511 27,700 SH   DFND 1 27,700 0 0
American Outdoor Brands Corp. COM 02874P103 659 43,200 SH   DFND 1 43,200 0 0
Amkor Technology, Inc. COM 031652100 619 58,700 SH   DFND 1 58,700 0 0
AMN Healthcare Services, Inc. COM 001744101 1,156 25,300 SH   DFND 1 25,300 0 0
Archrock Inc. COM 03957W106 830 66,100 SH   DFND 1 66,100 0 0
Aspen Technology Inc. COM 045327103 1,105 17,600 SH   DFND 1 17,600 0 0
Bankrate, Inc. COM 06647F102 1,000 71,700 SH   DFND 1 71,700 0 0
Barnes Group Inc. COM 067806109 1,324 18,800 SH   DFND 1 18,800 0 0
Belden Inc. COM 077454106 1,087 13,500 SH   DFND 1 13,500 0 0
Benchmark Electronics Inc. COM 08160H101 1,120 32,800 SH   DFND 1 32,800 0 0
Blucora, Inc. COM 095229100 989 39,100 SH   DFND 1 39,100 0 0
Cardtronics PLC COM G1991C105 642 27,900 SH   DFND 1 27,900 0 0
Cathay General Bancorp COM 149150104 1,089 27,100 SH   DFND 1 27,100 0 0
Central Pacific Financial Corp. COM 154760409 1,072 33,300 SH   DFND 1 33,300 0 0
Chefs' Warehouse, Inc. COM 163086101 816 42,300 SH   DFND 1 42,300 0 0
ChemoCentryx, Inc. COM 16383L106 533 71,800 SH   DFND 1 71,800 0 0
Cirrus Logic, Inc. COM 172755100 555 10,400 SH   DFND 1 10,400 0 0
CNO Financial Group, Inc. COM 12621E103 1,092 46,800 SH   DFND 1 46,800 0 0
Cogent Communications COM 19239V302 1,159 23,700 SH   DFND 1 23,700 0 0
Collectors Universe, Inc. COM 19421R200 808 33,700 SH   DFND 1 33,700 0 0
Commvault Systems, Inc. COM 204166102 973 16,000 SH   DFND 1 16,000 0 0
Continental Building Products COM 211171103 967 37,200 SH   DFND 1 37,200 0 0
Costamare Inc. COM Y1771G102 842 136,300 SH   DFND 1 136,300 0 0
CSG Systems International, Inc. COM 126349109 1,003 25,000 SH   DFND 1 25,000 0 0
CubeSmart COM 229663109 872 33,600 SH   DFND 1 33,600 0 0
Customers Bancorp, Inc. COM 23204G100 959 29,400 SH   DFND 1 29,400 0 0
CyrusOne Inc. COM 23283R100 1,096 18,600 SH   DFND 1 18,600 0 0
Dana Incorporated COM 235825205 1,158 41,400 SH   DFND 1 41,400 0 0
Darling Ingredients, Inc. COM 237266101 759 43,300 SH   DFND 1 43,300 0 0
DCT Industrial Trust, Inc. COM 233153204 1,118 19,300 SH   DFND 1 19,300 0 0
Delek US Holdings, Inc. COM 24665A103 764 28,600 SH   DFND 1 28,600 0 0
Deluxe Corp. COM 248019101 897 12,300 SH   DFND 1 12,300 0 0
Digital Realty Trust Inc. COM 253868103 993 8,393 SH   DFND 1 8,393 0 0
EMCOR Group, Inc. COM 29084Q100 888 12,800 SH   DFND 1 12,800 0 0
Emergent Biosolutions Inc. COM 29089Q105 724 17,900 SH   DFND 1 17,900 0 0
Empire State Realty Trust, Inc. COM 292104106 933 45,400 SH   DFND 1 45,400 0 0
Enanta Pharmaceuticals, Inc. COM 29251M106 936 20,000 SH   DFND 1 20,000 0 0
Esterline Technologies Corp. COM 297425100 974 10,800 SH   DFND 1 10,800 0 0
Ethan Allen Interiors Inc. COM 297602104 849 26,200 SH   DFND 1 26,200 0 0
Exact Sciences Corp. COM 30063P105 905 19,200 SH   DFND 1 19,200 0 0
ExlService Holdings, Inc. COM 302081104 956 16,400 SH   DFND 1 16,400 0 0
Federal Agricultural Mortgage Corp. COM 313148306 1,353 18,600 SH   DFND 1 18,600 0 0
Fidelity & Guaranty Life COM 315785105 1,143 36,800 SH   DFND 1 36,800 0 0
Flagstar Bancorp, Inc. COM 337930705 1,380 38,900 SH   DFND 1 38,900 0 0
Globus Medical, Inc. COM 379577208 906 30,500 SH   DFND 1 30,500 0 0
Great Western Bancorp, Inc. COM 391416104 1,061 25,700 SH   DFND 1 25,700 0 0
Halyard Health, Inc. COM 40650V100 959 21,300 SH   DFND 1 21,300 0 0
Hancock Holding Co. COM 410120109 1,168 24,100 SH   DFND 1 24,100 0 0
Harsco Corp. COM 415864107 1,281 61,300 SH   DFND 1 61,300 0 0
HealthSouth Corp. COM 421924309 844 18,200 SH   DFND 1 18,200 0 0
Highwoods Properties, Inc. COM 431284108 943 18,100 SH   DFND 1 18,100 0 0
Horizon Pharma PLC COM G4617B105 606 47,800 SH   DFND 1 47,800 0 0
Independent Bank Corp. COM 453838609 1,071 47,300 SH   DFND 1 47,300 0 0
Ingles Markets, Inc. COM 457030104 784 30,500 SH   DFND 1 30,500 0 0
Inogen, Inc. COM 45780L104 618 6,500 SH   DFND 1 6,500 0 0
Inter Parfums, Inc. COM 458334109 796 19,300 SH   DFND 1 19,300 0 0
iShares Russell 2000 COM 464287655 237 1,600 SH   DFND 1 1,600 0 0
j2 Global, Inc. COM 48123V102 983 13,300 SH   DFND 1 13,300 0 0
Kaiser Aluminum Corp. COM 483007704 1,135 11,000 SH   DFND 1 11,000 0 0
KapStone Paper and Packaging Corp. COM 48562P103 817 38,000 SH   DFND 1 38,000 0 0
KLX Inc. COM 482539103 1,143 21,600 SH   DFND 1 21,600 0 0
Lannett Company, Inc. COM 516012101 727 39,400 SH   DFND 1 39,400 0 0
Ligand Pharmaceuticals, Inc. COM 53220K504 667 4,900 SH   DFND 1 4,900 0 0
Lithia Motors, Inc. COM 536797103 1,167 9,700 SH   DFND 1 9,700 0 0
Marriott Vacations Worldwide Corp. COM 57164Y107 1,133 9,100 SH   DFND 1 9,100 0 0
Masimo Corp. COM 574795100 892 10,300 SH   DFND 1 10,300 0 0
Matador Resources Co. COM 576485205 858 31,600 SH   DFND 1 31,600 0 0
Minerals Technologies Inc. COM 603158106 714 10,100 SH   DFND 1 10,100 0 0
MKS Instruments, Inc. COM 55306N104 774 8,200 SH   DFND 1 8,200 0 0
National Bank Holdings Corp. COM 633707104 1,064 29,800 SH   DFND 1 29,800 0 0
National Health Investors, Inc. COM 63633D104 866 11,200 SH   DFND 1 11,200 0 0
Nelnet, Inc. COM 64031N108 944 18,700 SH   DFND 1 18,700 0 0
Newpark Resources, Inc. COM 651718504 835 83,500 SH   DFND 1 83,500 0 0
NIC Inc. COM 62914B100 878 51,200 SH   DFND 1 51,200 0 0
Oasis Petroleum Inc. COM 674215108 880 96,500 SH   DFND 1 96,500 0 0
Old Second Bancorp, Inc. COM 680277100 1,135 84,400 SH   DFND 1 84,400 0 0
OraSure Technologies, Inc. COM 68554V108 974 43,300 SH   DFND 1 43,300 0 0
PAREXEL International Corp. COM 699462107 958 10,876 SH   DFND 1 10,876 0 0
Party City Holdco Inc. COM 702149105 938 69,200 SH   DFND 1 69,200 0 0
Pattern Energy Group Co. COM 70338P100 923 38,300 SH   DFND 1 38,300 0 0
Paycom Software, Inc. COM 70432V102 1,117 14,900 SH   DFND 1 14,900 0 0
Pebblebrook Hotel Trust COM 70509V100 1,041 28,800 SH   DFND 1 28,800 0 0
Penn National Gaming, Inc. COM 707569109 1,123 48,000 SH   DFND 1 48,000 0 0
PennyMac Mortgage Investment Trust COM 70931T103 949 54,600 SH   DFND 1 54,600 0 0
Perry Ellis International, Inc. COM 288853104 1,226 51,800 SH   DFND 1 51,800 0 0
Photronics, Inc. COM 719405102 614 69,400 SH   DFND 1 69,400 0 0
Piper Jaffray Companies COM 724078100 742 12,500 SH   DFND 1 12,500 0 0
PNM Resources, Inc. COM 69349H107 999 24,800 SH   DFND 1 24,800 0 0
PolyOne Corp. COM 73179P106 1,049 26,200 SH   DFND 1 26,200 0 0
Portland General Electric Co. COM 736508847 958 21,000 SH   DFND 1 21,000 0 0
Progress Software Corp. COM 743312100 1,034 27,100 SH   DFND 1 27,100 0 0
RadNet, Inc. COM 750491102 1,057 91,500 SH   DFND 1 91,500 0 0
Repligen Corp. COM 759916109 648 16,900 SH   DFND 1 16,900 0 0
Resources Connection, Inc. COM 76122Q105 1,155 83,100 SH   DFND 1 83,100 0 0
RLJ Lodging Trust COM 74965L101 781 35,500 SH   DFND 1 35,500 0 0
Ruth's Hospitality Group, Inc. COM 783332109 1,016 48,500 SH   DFND 1 48,500 0 0
Sanmina Corp. COM 801056102 1,141 30,700 SH   DFND 1 30,700 0 0
Schnitzer Steel Industries, Inc. COM 806882106 935 33,200 SH   DFND 1 33,200 0 0
Sinclair Broadcast Group Inc COM 829226109 737 23,000 SH   DFND 1 23,000 0 0
Sotheby's Class A COM 835898107 950 20,600 SH   DFND 1 20,600 0 0
SPX Corp. COM 784635104 1,209 41,200 SH   DFND 1 41,200 0 0
Stifel Financial Corp. COM 860630102 1,010 18,900 SH   DFND 1 18,900 0 0
Sucampo Pharmaceuticals, Inc. COM 864909106 765 64,800 SH   DFND 1 64,800 0 0
Supernus Pharmaceuticals, Inc. COM 868459108 736 18,400 SH   DFND 1 18,400 0 0
Tech Data Corp. COM 878237106 1,040 11,700 SH   DFND 1 11,700 0 0
Tenet Healthcare Corp. COM 88033G407 800 48,700 SH   DFND 1 48,700 0 0
Tetra Tech, Inc. COM 88162G103 1,178 25,300 SH   DFND 1 25,300 0 0
Texas Capital Bancshares, Inc. COM 88224Q107 1,073 12,500 SH   DFND 1 12,500 0 0
The Greenbrier Companies Inc. COM 393657101 1,194 24,800 SH   DFND 1 24,800 0 0
Time Inc. COM 887228104 968 71,700 SH   DFND 1 71,700 0 0
Travelport Worldwide Ltd COM G9019D104 884 56,300 SH   DFND 1 56,300 0 0
Trinseo S.A. COM L9340P101 879 13,100 SH   DFND 1 13,100 0 0
TTM Technologies, Inc. COM 87305R109 1,185 77,100 SH   DFND 1 77,100 0 0
Unit Corp. COM 909218109 790 38,400 SH   DFND 1 38,400 0 0
United Community Bank, Inc. COM 90984P303 956 33,500 SH   DFND 1 33,500 0 0
Univar, Inc. COM 91336L107 960 33,200 SH   DFND 1 33,200 0 0
Walker & Dunlop, Inc. COM 93148P102 1,204 23,000 SH   DFND 1 23,000 0 0
Webster Financial Corp. COM 947890109 956 18,200 SH   DFND 1 18,200 0 0
West Corp. COM 952355204 953 40,600 SH   DFND 1 40,600 0 0
Wintrust Financial Corp. COM 97650W108 1,042 13,300 SH   DFND 1 13,300 0 0
YRC Worldwide Inc. COM 984249607 1,230 89,100 SH   DFND 1 89,100 0 0
Zumiez Inc. COM 989817101 1,424 78,700 SH   DFND 1 78,700 0 0