| ADAMS NATURAL RESOURCES FUND, INC. | 549,091 | $89,408 | 15.08% |
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| Gruss & Co., LLC | 12,300 | $2,003 | 8.89% |
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| ACR Alpine Capital Research, LLC | 1,052,740 | $171,417 | 8.51% |
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| Berkshire Hathaway | 159,178,117 | $25,918,973 | 7.13% |
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| Solus Alternative Asset Management LP | 195,437 | $31,823 | 7.01% |
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| WOODWARD DIVERSIFIED CAPITAL, LLC | 58,381 | $9,506 | 6.22% |
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| FOUNDATION RESOURCE MANAGEMENT INC | 232,462 | $37,852 | 5.84% |
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| Sage Investment Advisers LLC | 25,873 | $4,213 | 5.58% |
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| Poplar Forest Capital LLC | 315,800 | $51,422 | 5.35% |
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| Canal Insurance CO | 109,240 | $17,788 | 4.88% |
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| AR ASSET MANAGEMENT INC | 115,326 | $18,779 | 4.75% |
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| American Investment Services, Inc. | 130,188 | $21,199 | 4.66% |
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| Cornerstone Investment Partners, LLC | 498,530 | $81,176 | 4.64% |
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| Lazard Freres Gestion S.A.S. | 958,131 | $151,998 | 4.58% |
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| BLUESTEIN R H & CO LLC | 651,470 | $106,079 | 4.45% |
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| SPRING CAPITAL MANAGEMENT, LLC | 33,041 | $5,380 | 4.37% |
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| Stack Financial Management, Inc | 330,625 | $53,836 | 4.33% |
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| RIDGECREST WEALTH PARTNERS, LLC | 41,310 | $6,727 | 4.27% |
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| Energy Opportunities Capital Management, LLC | 10,995 | $1,790 | 4.26% |
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| McGinn Investment Management, Inc. | 38,855 | $6,327 | 4.23% |
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