X0303 4 2010-12-31 0 0000216851 PETROLEUM & RESOURCES CORP PEO 0001466287 Hook Brian Stephen 7 ST. PAUL STREET SUITE 1140 BALTIMORE MD 21202 0 1 0 0 Treasurer Common Stock 2010-12-31 5 J 0 E 244 0 A 427 I By Issuer's Thrift Plan Trust Common Stock 2010-12-31 5 J 0 E 8 0 A 2302 D Common Stock 2011-01-13 4 A 0 1062 0 A 3364 D The number of shares reported as held by the Issuer's Thrift Plan Trust represents the undersigned's proportionate beneficial interest in such stock held in the Trust. Such number is based on information as of December 31, 2010. This number reflects periodic contributions made during 2010, shares acquired by the Trustee through dividend reinvestment, and changes in the number of shares previously reported due to fluctuations in the market price and interests in the Trust. Shares were acquired by the Trustee at various times during 2010. The Issuer's stock traded in a range of $19.56-27.13 during 2010. These shares were acquired in exempt transactions as a result of dividend reinvestment. The Issuer's stock traded in a range of $19.56-27.13 during 2010. N/A. Restricted Stock Grant. Shares will vest in 2014. Brian S. Hook 2011-01-14