Oil sector stocks were among the top performers during early trading. At the time of writing, Petrochina Company Limited (00857) had risen by 4.14% to HK$9.56. China Oilfield Services Limited (02883) increased by 3.61% to HK$10.05. CNOOC Limited (00883) advanced 3.18% to HK$25.94. China Petroleum & Chemical Corporation (00386) was up 0.92% at HK$5.49.