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
ALLEGHENY TECHNOLOGIES INC COM 01741R102 1,300 51,569 SH   DFND 1 51,569 0 0
ALTUS MIDSTREAM CO CL A 02215L100 4,262 1,145,792 SH   SOLE 1,145,792 0 0
ANTERO MIDSTREAM CORP COM 03676B102 40,317 3,518,049 SH   DFND 1 3,518,049 0 0
APERGY CORP COM 03755L104 1,623 48,401 SH   DFND 1 48,401 0 0
ATLANTICA YIELD PLC SHS G0751N103 11,833 521,980 SH   SOLE 521,980 0 0
BP PLC SPONSORED ADR 055622104 11,030 264,520 SH   DFND 1 264,520 0 0
BRIGHAM MINERALS INC CL A COM 10918L103 1,976 92,099 SH   SOLE 92,099 0 0
CABOT OIL & GAS CORP COM 127097103 1,500 65,350 SH   DFND 1 65,350 0 0
CACTUS INC CL A 127203107 2,053 61,984 SH   DFND 1 61,984 0 0
CANADIAN NAT RES LTD COM 136385101 1,716 63,644 SH   DFND 1 63,644 0 0
CHENIERE ENERGY INC COM NEW 16411R208 101,117 1,477,244 SH   DFND 1 1,477,244 0 0
CHEVRON CORP NEW COM 166764100 3,187 25,610 SH   DFND 1 25,610 0 0
CIMAREX ENERGY CO COM 171798101 1,696 28,593 SH   DFND 1 28,593 0 0
CLEARWAY ENERGY INC CL C 18539C204 9,614 570,208 SH   DFND 1 570,208 0 0
CNX MIDSTREAM PARTNERS LP COM UNIT REPST 12654A101 4,756 338,530 SH   SOLE 338,530 0 0
CONCHO RES INC COM 20605P101 2,783 26,973 SH   DFND 1 26,973 0 0
CONOCOPHILLIPS COM 20825C104 1,153 18,900 SH   DFND 1 18,900 0 0
CRESTWOOD EQUITY PARTNERS LP UNIT LTD PARTNER 226344208 79,760 2,229,789 SH   DFND 1 2,229,789 0 0
CVR ENERGY INC COM 12662P108 2,999 60,000 SH   SOLE 60,000 0 0
DCP MIDSTREAM LP COM UT LTD PTN 23311P100 66,400 2,266,225 SH   DFND 1 2,266,225 0 0
DIAMONDBACK ENERGY INC COM 25278X109 6,224 57,120 SH   DFND 1 57,120 0 0
DOW INC COM 260557103 8,705 176,537 SH   DFND 1 176,537 0 0
EATON CORP PLC SHS G29183103 1,824 21,905 SH   DFND 1 21,905 0 0
ENABLE MIDSTREAM PARTNERS LP COM UNIT RP IN 292480100 44,590 3,252,384 SH   DFND 1 3,252,384 0 0
ENBRIDGE INC COM 29250N105 76,318 2,115,249 SH   DFND 1 2,115,249 0 0
ENCANA CORP COM 292505104 3,086 601,575 SH   DFND 1 601,575 0 0
ENERGY TRANSFER LP COM UT LTD PTN 29273V100 191,895 13,628,926 SH   DFND 1 13,628,926 0 0
ENLINK MIDSTREAM LLC COM UNIT REP LTD 29336T100 49,277 4,883,726 SH   DFND 1 4,883,726 0 0
ENTERPRISE PRODS PARTNERS L COM 293792107 194,152 6,725,034 SH   DFND 1 6,725,034 0 0
EOG RES INC COM 26875P101 2,001 21,479 SH   DFND 1 21,479 0 0
EQM MIDSTREAM PARTNERS LP UNIT LTD PARTN 26885B100 50,561 1,131,631 SH   DFND 1 1,131,631 0 0
EQUINOR ASA SPONSORED ADR 29446M102 1,337 67,612 SH   DFND 1 67,612 0 0
EQUITRANS MIDSTREAM CORPORAT COM 294600101 3,298 167,330 SH   SOLE 167,330 0 0
FTS INTERNATIONAL INC COM 30283W104 654 117,197 SH   DFND 1 117,197 0 0
GASLOG PARTNERS LP UNIT LTD PTNRP Y2687W108 15,795 744,000 SH   DFND 1 744,000 0 0
GENESIS ENERGY L P UNIT LTD PARTN 371927104 57,619 2,630,990 SH   DFND 1 2,630,990 0 0
GOLAR LNG LTD BERMUDA SHS G9456A100 2,443 132,221 SH   DFND 1 132,221 0 0
GOLAR LNG PARTNERS LP COM UNIT LPI Y2745C102 3,058 270,624 SH   SOLE 270,624 0 0
HALLIBURTON CO COM 406216101 2,350 103,352 SH   DFND 1 103,352 0 0
HOLLYFRONTIER CORP COM 436106108 1,657 35,805 SH   DFND 1 35,805 0 0
JACOBS ENGR GROUP INC COM 469814107 2,984 35,360 SH   DFND 1 35,360 0 0
KIMBELL RTY PARTNERS LP UNIT 49435R102 5,057 313,138 SH   DFND 1 313,138 0 0
KINDER MORGAN INC DEL COM 49456B101 98,159 4,701,124 SH   DFND 1 4,701,124 0 0
KIRBY CORP COM 497266106 914 11,569 SH   DFND 1 11,569 0 0
LYONDELLBASELL INDUSTRIES N SHS - A - N53745100 5,318 61,749 SH   DFND 1 61,749 0 0
MAGELLAN MIDSTREAM PRTNRS LP COM UNIT RP LP 559080106 106,887 1,670,104 SH   DFND 1 1,670,104 0 0
MARATHON OIL CORP COM 565849106 1,137 80,000 SH   DFND 1 80,000 0 0
MARATHON PETE CORP COM 56585A102 3,153 56,418 SH   DFND 1 56,418 0 0
MATADOR RES CO COM 576485205 1,252 62,999 SH   DFND 1 62,999 0 0
MCDERMOTT INTL INC COM 580037703 1,366 141,412 SH   DFND 1 141,412 0 0
MPLX LP COM UNIT REP LTD 55336V100 136,169 4,230,154 SH   DFND 1 4,230,154 0 0
NEW FORTRESS ENERGY LLC CL A SHS RP LLC 644393100 4,763 406,721 SH   DFND 1 406,721 0 0
NEXTERA ENERGY PARTNERS LP COM UNIT PART IN 65341B106 70,124 1,453,357 SH   DFND 1 1,453,357 0 0
NGL ENERGY PARTNERS LP COM UNIT REPST 62913M107 739 50,000 SH   SOLE 50,000 0 0
NOBLE ENERGY INC COM 655044105 839 37,455 SH   DFND 1 37,455 0 0
NOBLE MIDSTREAM PARTNERS LP COM UNIT REPST 65506L105 5,444 163,681 SH   SOLE 163,681 0 0
NUSTAR ENERGY LP UNIT COM 67058H102 28,648 1,055,568 SH   DFND 1 1,055,568 0 0
OCCIDENTAL PETE CORP COM 674599105 7,614 151,426 SH   DFND 1 151,426 0 0
ONEOK INC NEW COM 682680103 173,071 2,515,199 SH   DFND 1 2,515,199 0 0
OSHKOSH CORP COM 688239201 2,480 29,702 SH   DFND 1 29,702 0 0
PARSLEY ENERGY INC CL A 701877102 4,576 240,733 SH   DFND 1 240,733 0 0
PATTERN ENERGY GROUP INC CL A 70338P100 4,524 195,933 SH   SOLE 195,933 0 0
PATTERSON UTI ENERGY INC COM 703481101 1,428 124,042 SH   DFND 1 124,042 0 0
PBF LOGISTICS LP UNIT LTD PTNR 69318Q104 3,319 157,000 SH   SOLE 157,000 0 0
PEMBINA PIPELINE CORP COM 706327103 100,520 2,701,412 SH   DFND 1 2,701,412 0 0
PHILLIPS 66 COM 718546104 8,859 94,704 SH   DFND 1 94,704 0 0
PHILLIPS 66 PARTNERS LP COM UNIT REP INT 718549207 41,602 843,003 SH   DFND 1 843,003 0 0
PIONEER NAT RES CO COM 723787107 3,907 25,390 SH   DFND 1 25,390 0 0
PLAINS ALL AMERN PIPELINE L UNIT LTD PARTN 726503105 102,051 4,191,021 SH   DFND 1 4,191,021 0 0
PLAINS GP HLDGS L P LTD PARTNR INT A 72651A207 74,247 2,973,442 SH   SOLE 2,973,442 0 0
ROSEHILL RES INC CL A 777385105 1,917 518,180 SH   DFND 1 518,180 0 0
ROYAL DUTCH SHELL PLC SPONS ADR A 780259206 5,742 88,250 SH   SOLE 88,250 0 0
SCHLUMBERGER LTD COM 806857108 1,481 37,275 SH   DFND 1 37,275 0 0
SELECT ENERGY SVCS INC CL A COM 81617J301 1,811 155,959 SH   DFND 1 155,959 0 0
SEMGROUP CORP CL A 81663A105 206 17,160 SH   SOLE 17,160 0 0
SHELL MIDSTREAM PARTNERS L P UNIT LTD INT 822634101 73,391 3,542,054 SH   DFND 1 3,542,054 0 0
SOUTHWEST AIRLS CO COM 844741108 2,603 51,262 SH   DFND 1 51,262 0 0
SUNCOR ENERGY INC NEW COM 867224107 1,406 45,130 SH   DFND 1 45,130 0 0
SUNOCO LP COM UT REP LP 86765K109 7,194 230,000 SH   SOLE 230,000 0 0
TALLGRASS ENERGY LP CLASS A SHS 874696107 3,466 164,181 SH   DFND 1 164,181 0 0
TARGA RES CORP COM 87612G101 109,474 2,788,441 SH   DFND 1 2,788,441 0 0
TC ENERGY CORP COM 87807B107 18,307 369,680 SH   DFND 1 369,680 0 0
TELLURIAN INC NEW COM 87968A104 1,847 235,304 SH   DFND 1 235,304 0 0
TOTAL S A SPONSORED ADS 89151E109 2,547 45,658 SH   DFND 1 45,658 0 0
U S WELL SVCS INC CL A 91274U101 612 126,903 SH   DFND 1 126,903 0 0
UNITED RENTALS INC COM 911363109 1,749 13,184 SH   DFND 1 13,184 0 0
VALERO ENERGY CORP NEW COM 91913Y100 10,196 119,098 SH   DFND 1 119,098 0 0
VERMILION ENERGY INC COM 923725105 5,822 267,937 SH   DFND 1 267,937 0 0
VIPER ENERGY PARTNERS LP COM UNT RP INT 92763M105 23,026 747,108 SH   DFND 1 747,108 0 0
WABTEC CORP COM 929740108 2,404 33,506 SH   DFND 1 33,506 0 0
WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 57,308 1,862,476 SH   DFND 1 1,862,476 0 0
WESTLAKE CHEM CORP COM 960413102 1,035 14,906 SH   DFND 1 14,906 0 0
WILLIAMS COS INC DEL COM 969457100 184,835 6,591,817 SH   DFND 1 6,591,817 0 0
WPX ENERGY INC COM 98212B103 4,361 378,866 SH   DFND 1 378,866 0 0
XYLEM INC COM 98419M100 1,291 15,437 SH   DFND 1 15,437 0 0