| DELPHI FINANCIAL GROUP, INC. | 1,583,389 | $54,547,751 | 26.90% |
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| PPM AMERICA INC/IL | 89,400 | $3,079,830 | 14.89% |
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| Fractal Investments LLC | 1,447,919 | $49,880,810 | 11.59% |
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| CHICKASAW CAPITAL MANAGEMENT LLC | 6,147,793 | $211,791 | 11.28% |
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| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | 1,316,775 | $45,362,899 | 10.38% |
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| Heronetta Management, L.P. | 332,069 | $11,439,777 | 8.40% |
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| ALPS ADVISORS INC | 23,649,524 | $814,726,102 | 7.20% |
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| Blackstone Inc. | 50,478,554 | $1,738,986,186 | 7.12% |
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| KAYNE ANDERSON CAPITAL ADVISORS LP | 6,491,071 | $223,617,396 | 6.63% |
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| TORTOISE CAPITAL ADVISORS, L.L.C. | 12,474,181 | $429,735,535 | 6.46% |
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| RR Advisors, LLC | 906,000 | $31,220 | 5.44% |
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| Sovereign Investment Advisors, LLC | 373,955 | $12,882,750 | 5.11% |
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| Progeny 3, Inc. | 869,859 | $29,966,643 | 5.08% |
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| INFRASTRUCTURE CAPITAL ADVISORS, LLC | 1,180,242 | $40,659,337 | 4.64% |
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| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT | 1,183,701 | $40,778,500 | 4.10% |
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| Kercheville Advisors, LLC | 169,723 | $5,846,973 | 4.01% |
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| Granby Capital Management, LLC | 130,000 | $4,478,500 | 3.54% |
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| EAGLE GLOBAL ADVISORS LLC | 1,500,416 | $51,689,331 | 3.48% |
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| BEACH INVESTMENT COUNSEL INC/PA | 758,441 | $26,128 | 3.48% |
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| SPIRIT OF AMERICA MANAGEMENT CORP/NY | 431,397 | $14,861,627 | 3.32% |
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