| Kercheville Advisors, LLC | 201,167 | $5,859,997 | 3.72% |
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| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT | 1,142,580 | $33,283,355 | 3.37% |
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| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | 386,864 | $11,269,348 | 2.98% |
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| ALPS ADVISORS INC | 11,728,814 | $341,660,352 | 2.84% |
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| Energy Income Partners, LLC | 4,118,258 | $119,964,856 | 2.73% |
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| Heronetta Management, L.P. | 104,455 | $3,042,774 | 2.23% |
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| GoodHaven Capital Management | 143,307 | $4,174,533 | 2.19% |
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| Castellan Group | 91,435 | $2,663,502 | 1.87% |
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| SPIRIT OF AMERICA MANAGEMENT CORP/NY | 234,837 | $6,840,802 | 1.54% |
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| EAGLE GLOBAL ADVISORS LLC | 782,765 | $22,801,944 | 1.48% |
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| TORTOISE CAPITAL ADVISORS, L.L.C. | 3,211,026 | $93,537,187 | 1.42% |
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| INFRASTRUCTURE CAPITAL ADVISORS, LLC | 422,920 | $12,319,660 | 1.41% |
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| Aventail Capital Group, LP | 687,827 | $20,036,401 | 1.39% |
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| Stokes Capital Advisors, LLC | 129,703 | $3,778,249 | 1.32% |
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| Pinnacle Holdings, LLC | 84,136 | $2,450,873 | 1.15% |
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| Camarda Financial Advisors, LLC | 51,410 | $1,497,562 | 0.97% |
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| NBW CAPITAL LLC | 133,278 | $3,882,388 | 0.95% |
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| KAYNE ANDERSON CAPITAL ADVISORS LP | 837,960 | $24,409,775 | 0.76% |
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| Penbrook Management LLC | 30,830 | $898,078 | 0.66% |
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| MILLER HOWARD INVESTMENTS INC /NY | 497,407 | $14,489,479 | 0.53% |
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