China Oilfield Services : COSL on Hang Seng (China A) Corporate Sustainability Index

China Oilfield Services Limited ("COSL" or the "Company") is pleased to acknowledge as a constituent stock (2014-2015) of the Hang Seng (China A) Corporate Sustainability Index ("HSCASUS") in succession, along with other 28 A share listed companies; and the inclusion for the first time as a constituent stock of the Hang Seng Corporate Sustainability Benchmark Index ("HSSUSB"), along with other 75 Hong Kong-listed companies.

COSL has been included in HSCASUS for three consecutive years since 2012. Selection of index constituents is based on a robust process that includes consideration of results from a sustainability assessment by Hong Kong Quality Assurance Agency (HKQAA), an independent and professional assessment body, using its proprietary sustainability assessment and rating framework. The process ensures that indexes in the Hang Seng Corporate Sustainability Index Series are objective, reliable and of high investability, making them excellent benchmarks for index funds that adopt a corporate sustainability theme. HSCASUS and HSSUSB are reviewed annually. COSL has been performing well with respect to corporate sustainability and won the recognitions from the capital market.