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
8POINT3 ENERGY PARTNERS LP CL A RPT LTDPT 282539105 2,076 136,508 SH   SOLE   136,508 0 0
ALLETE INC COM NEW 018522300 1,965 26,425 SH   SOLE   26,425 0 0
AMERICAN WTR WKS CO INC NEW COM 030420103 1,484 16,217 SH   SOLE   16,217 0 0
ANADARKO PETE CORP COM 032511107 12,977 241,925 SH   SOLE   241,925 0 0
ANDEAVOR COM 03349M105 1,197 10,471 SH   SOLE   10,471 0 0
ANDEAVOR LOGISTICS LP COM UNIT LP INT 03350F106 6,152 133,192 SH   SOLE   133,192 0 0
ANTERO MIDSTREAM GP LP COM SHS REPSTG 03675Y103 24,696 1,252,358 SH   SOLE   1,252,358 0 0
ANTERO MIDSTREAM PARTNERS LP UNT LTD PARTN 03673L103 3,133 107,874 SH   SOLE   107,874 0 0
AQUA AMERICA INC COM 03836W103 1,156 29,460 SH   SOLE   29,460 0 0
ATLANTICA YIELD PLC SHS G0751N103 4,297 202,614 SH   SOLE   202,614 0 0
ATMOS ENERGY CORP COM 049560105 1,501 17,473 SH   SOLE   17,473 0 0
BLACK HILLS CORP COM 092113109 1,339 22,281 SH   SOLE   22,281 0 0
BOARDWALK PIPELINE PARTNERS UT LTD PARTNER 096627104 17,465 1,352,819 SH   SOLE   1,352,819 0 0
CABOT OIL & GAS CORP COM 127097103 1,286 44,975 SH   SOLE   44,975 0 0
CHENIERE ENERGY INC COM NEW 16411R208 40,143 745,606 SH   SOLE   745,606 0 0
CHESAPEAKE ENERGY CORP COM 165167107 365 92,150 SH   SOLE   92,150 0 0
CHEVRON CORP NEW COM 166764100 39,640 316,640 SH   SOLE   316,640 0 0
CIMAREX ENERGY CO COM 171798101 1,419 11,631 SH   SOLE   11,631 0 0
CONCHO RES INC COM 20605P101 18,340 122,087 SH   SOLE   122,087 0 0
CONOCOPHILLIPS COM 20825C104 5,665 103,213 SH   SOLE   103,213 0 0
CONTINENTAL RESOURCES INC COM 212015101 46,685 881,343 SH   SOLE   881,343 0 0
DEVON ENERGY CORP NEW COM 25179M103 2,787 67,329 SH   SOLE   67,329 0 0
DIAMONDBACK ENERGY INC COM 25278X109 48,511 384,249 SH   SOLE   384,249 0 0
ENABLE MIDSTREAM PARTNERS LP COM UNIT RP IN 292480100 8,392 590,148 SH   SOLE   590,148 0 0
ENCANA CORP COM 292505104 295 22,168 SH   SOLE   22,168 0 0
ENERGY TRANSFER EQUITY L P COM UT LTD PTN 29273V100 20,216 1,171,251 SH   SOLE   1,171,251 0 0
ENERGY TRANSFER PARTNERS LP UNIT LTD PRT INT 29278N103 21,621 1,206,543 SH   SOLE   1,206,543 0 0
ENTERPRISE PRODS PARTNERS L COM 293792107 30,143 1,137,053 SH   SOLE   1,137,053 0 0
EOG RES INC COM 26875P101 47,048 435,995 SH   SOLE   435,995 0 0
EQT CORP COM 26884L109 8,377 147,165 SH   SOLE   147,165 0 0
EQT GP HLDGS LP COM UNIT REP 26885J103 12,197 453,414 SH   SOLE   453,414 0 0
EQT MIDSTREAM PARTNERS LP UNIT LTD PARTN 26885B100 4,040 55,268 SH   SOLE   55,268 0 0
EVOQUA WATER TECHNOLOGIES CO COM 30057T105 998 42,093 SH   SOLE   42,093 0 0
EXELON CORP COM 30161N101 2,552 64,761 SH   SOLE   64,761 0 0
EXXON MOBIL CORP COM 30231G102 7,006 83,766 SH   SOLE   83,766 0 0
FAIRMOUNT SANTROL HLDGS INC COM 30555Q108 26,035 4,977,990 SH   SOLE   4,977,990 0 0
FORUM ENERGY TECHNOLOGIES IN COM 34984V100 29,538 1,899,562 SH   SOLE   1,899,562 0 0
GOLAR LNG LTD BERMUDA SHS G9456A100 11,407 382,667 SH   SOLE   382,667 0 0
GREAT PLAINS ENERGY INC COM 391164100 2,943 91,283 SH   SOLE   91,283 0 0
GULFPORT ENERGY CORP COM NEW 402635304 369 28,945 SH   SOLE   28,945 0 0
HALLIBURTON CO COM 406216101 49,177 1,006,275 SH   SOLE   1,006,275 0 0
KINDER MORGAN INC DEL COM 49456B101 22,712 1,256,883 SH   SOLE   1,256,883 0 0
LAREDO PETROLEUM INC COM 516806106 10,992 1,036,018 SH   SOLE   1,036,018 0 0
MARATHON OIL CORP COM 565849106 1,101 65,047 SH   SOLE   65,047 0 0
MARATHON PETE CORP COM 56585A102 2,761 41,848 SH   SOLE   41,848 0 0
MPLX LP COM UNIT REP LTD 55336V100 15,614 440,196 SH   SOLE   440,196 0 0
NEXTDECADE CORP COM 65342K105 3,094 371,835 SH   SOLE   371,835 0 0
NEXTERA ENERGY INC COM 65339F101 1,777 11,378 SH   SOLE   11,378 0 0
NEXTERA ENERGY PARTNERS LP COM UNIT PART IN 65341B106 1,091 25,318 SH   SOLE   25,318 0 0
NGL ENERGY PARTNERS LP COM UNIT REPST 62913M107 16,734 1,191,008 SH   SOLE   1,191,008 0 0
NOBLE MIDSTREAM PARTNERS LP COM UNIT REPST 65506L105 10,271 205,425 SH   SOLE   205,425 0 0
NRG YIELD INC CL A NEW 62942X306 719 38,148 SH   SOLE   38,148 0 0
OASIS MIDSTREAM PARTNERS LP COM UNITS REPS 67420T206 12,611 723,118 SH   SOLE   723,118 0 0
OASIS PETE INC NEW COM 674215108 31,901 3,793,224 SH   SOLE   3,793,224 0 0
OCCIDENTAL PETE CORP DEL COM 674599105 2,277 30,912 SH   SOLE   30,912 0 0
ONEOK INC NEW COM 682680103 11,237 210,237 SH   SOLE   210,237 0 0
PARSLEY ENERGY INC CL A 701877102 462 15,679 SH   SOLE   15,679 0 0
PATTERN ENERGY GROUP INC CL A 70338P100 1,868 86,920 SH   SOLE   86,920 0 0
PATTERSON UTI ENERGY INC COM 703481101 4,974 216,149 SH   SOLE   216,149 0 0
PG&E CORP COM 69331C108 616 13,750 SH   SOLE   13,750 0 0
PHILLIPS 66 COM 718546104 3,493 34,536 SH   SOLE   34,536 0 0
PIONEER NAT RES CO COM 723787107 3,069 17,757 SH   SOLE   17,757 0 0
PLAINS ALL AMERN PIPELINE L UNIT LTD PARTN 726503105 31,183 1,510,817 SH   SOLE   1,510,817 0 0
RICE MIDSTREAM PARTNERS LP UNIT LTD PARTN 762819100 2,496 116,262 SH   SOLE   116,262 0 0
ROYAL DUTCH SHELL PLC SPONS ADR A 780259206 19,720 295,601 SH   SOLE   295,601 0 0
SCHLUMBERGER LTD COM 806857108 4,348 64,518 SH   SOLE   64,518 0 0
SELECT ENERGY SVCS INC CL A COM 81617J301 11,107 608,953 SH   SOLE   608,953 0 0
SEMPRA ENERGY COM 816851109 1,325 12,396 SH   SOLE   12,396 0 0
SHELL MIDSTREAM PARTNERS L P UNIT LTD INT 822634101 14,557 488,147 SH   SOLE   488,147 0 0
SILVER RUN ACQUISITION COM CL A 82812A103 1,595 160,979 SH   SOLE   160,979 0 0
SUMMIT MIDSTREAM PARTNERS LP COM UNIT LTD 866142102 11,151 543,970 SH   SOLE   543,970 0 0
TARGA RES CORP COM 87612G101 24,230 500,413 SH   SOLE   500,413 0 0
TECHNIPFMC PLC COM G87110105 515 16,461 SH   SOLE   16,461 0 0
TRANSCANADA CORP COM 89353D107 15,068 309,777 SH   SOLE   309,777 0 0
U S SILICA HLDGS INC COM 90346E103 9,807 301,184 SH   SOLE   301,184 0 0
USA COMPRESSION PARTNERS LP COMUNIT LTDPAR 90290N109 6,508 393,469 SH   SOLE   393,469 0 0
VALERO ENERGY PARTNERS LP COM UNT REP LP 91914J102 12,726 285,977 SH   SOLE   285,977 0 0
WEATHERFORD INTL PLC ORD SHS G48833100 39,182 9,396,177 SH   SOLE   9,396,177 0 0
WESTERN GAS EQUITY PARTNERS COMUNT LTD PT 95825R103 24,300 653,934 SH   SOLE   653,934 0 0
WILLIAMS COS INC DEL COM 969457100 3,164 103,787 SH   SOLE   103,787 0 0
WILLIAMS PARTNERS L P NEW COM UNIT LTD PAR 96949L105 23,010 593,350 SH   SOLE   593,350 0 0
WPX ENERGY INC COM 98212B103 29,244 2,078,490 SH   SOLE   2,078,490 0 0
XYLEM INC COM 98419M100 703 10,305 SH   SOLE   10,305 0 0