| ClearBridge Investments Ltd | 6,566,554 | $197,390,610 | 6.40% |
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| Heronetta Management, L.P. | 191,698 | $7,638,162 | 5.60% |
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| Recurrent Investment Advisors LLC | 1,212,978 | $36,869,366 | 5.41% |
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| Cardinal Capital Management, Inc. | 2,684,661 | $80,970,297 | 4.22% |
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| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT | 1,350,002 | $40,581,060 | 4.11% |
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| Tortoise Index Solutions, LLC | 641,202 | $19,281,857 | 4.01% |
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| LINCLUDEN MANAGEMENT LTD | 1,033,597 | $31,098 | 3.76% |
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| HITE Hedge Asset Management LLC | 1,124,317 | $33,809,812 | 3.63% |
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| MORGAN DEMPSEY CAPITAL MANAGEMENT LLC | 304,701 | $9,159,304 | 2.85% |
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| KRAEMATON INVESTMENT ADVISORS, INC | 67,231 | $2,020,951 | 2.49% |
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| KAYNE ANDERSON CAPITAL ADVISORS LP | 2,493,491 | $74,954,339 | 2.33% |
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| TORTOISE CAPITAL ADVISORS, L.L.C. | 4,506,987 | $135,517,554 | 2.06% |
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| A. D. Beadell Investment Counsel, Inc. | 63,957 | $1,922 | 2.01% |
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| CASCADE INVESTMENT GROUP, INC. | 68,238 | $2,051,235 | 1.93% |
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| SIG North Trading, ULC | 1,149,800 | $34,562,988 | 1.65% |
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| Silver Lake Advisory, LLC | 88,145 | $2,650 | 1.64% |
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| CIBC WORLD MARKET INC. | 12,937,268 | $389,157 | 1.28% |
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| Tacita Capital Inc | 49,561 | $1,494,783 | 1.17% |
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| Addenda Capital Inc. | 656,035 | $26,792,469 | 1.17% |
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| BANK OF NOVA SCOTIA | 14,665,584 | $440,966,392 | 1.16% |
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