| DELPHI FINANCIAL GROUP, INC. | 1,583,389 | $51,998,494 | 26.16% |
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| PPM AMERICA INC/IL | 89,400 | $2,935,896 | 11.70% |
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| Fractal Investments LLC | 1,447,919 | $47,549,660 | 11.33% |
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| CHICKASAW CAPITAL MANAGEMENT LLC | 6,198,749 | $203,567 | 10.76% |
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| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | 1,316,775 | $43,242,891 | 9.80% |
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| Heronetta Management, L.P. | 460,533 | $15,123,904 | 9.54% |
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| INFRASTRUCTURE CAPITAL ADVISORS, LLC | 1,478,666 | $48,559,392 | 7.24% |
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| Blackstone Inc. | 50,516,528 | $1,658,962,781 | 6.29% |
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| KAYNE ANDERSON CAPITAL ADVISORS LP | 6,491,071 | $213,166,771 | 6.22% |
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| ALPS ADVISORS INC | 20,674,484 | $678,950,055 | 6.06% |
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| TORTOISE CAPITAL ADVISORS, L.L.C. | 11,717,394 | $384,799,219 | 5.77% |
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| Sovereign Investment Advisors, LLC | 373,955 | $12,280,682 | 5.15% |
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| Progeny 3, Inc. | 851,159 | $27,952,062 | 4.85% |
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| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT | 1,252,268 | $41,124,481 | 3.87% |
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| Kercheville Advisors, LLC | 170,496 | $5,599,078 | 3.86% |
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| SPIRIT OF AMERICA MANAGEMENT CORP/NY | 440,247 | $14,457,711 | 3.24% |
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| Granby Capital Management, LLC | 130,000 | $4,269,200 | 3.16% |
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| BEACH INVESTMENT COUNSEL INC/PA | 719,597 | $23,632 | 2.95% |
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| EAGLE GLOBAL ADVISORS LLC | 1,264,966 | $41,541,483 | 2.86% |
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| Energy Income Partners, LLC | 3,744,205 | $122,959,692 | 2.77% |
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