China Oilfield Services Ltd. Unsponsored ADR (CHOLY1)


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China Oilfield Services Limited provides integrated oilfield services in the offshore China market. Its services cover various phases of offshore oil and gas exploration, development, and production. The company operates in four segments: Drilling Services, Well Services, Marine Support and Transportation Services, and Geophysical Services. The Drilling Services segment provides oilfield drilling services and well workovers. The Well Services segment offers logging and downhole services, such as drilling fluids, directional drilling, cementing, and well completion services. The Marine Support and Transportation Services segment engages in transporting materials, supplies, and personnel to offshore facilities, and crude oil and refined products, as well as moving and positioning drilling structures. The Geophysical Services segment provides offshore seismic data collection, marine surveying, and data processing services. As of March 31, 2007, it operated 15 drilling rigs, including 11 jack-ups, 3 semisubmersibles, and 1 leased jack-up rig; and owned and operated 70 marine support vessels, 5 oil tankers, and 1 chemical vessel, as well as 7 seismic vessels, and 4 geotech survey vessels. China Oilfield Services operates in the People?s Republic of China, North and South America, the Middle East, offshore Africa, and offshore Europe. The company, formerly known as China National Offshore Oil Corporation, was founded in 1982 and is based in Tanggu, the People?s Republic of China. China Oilfield Services Limited is a subsidiary of China National Offshore Oil Corporation.

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Transaction Code Definitions
Code Definition
A Grant, award or other acquisition pursuant to Rule 16b-3(d)
C Conversion of derivative security
D Disposition to the issuer of issuer equity securities pursuant to Rule 16b-3(e)
E Expiration of short derivative position
F Payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3
G Bona fide gift
H Expiration (or cancellation) of long derivative position with value received
I Discretionary transaction in accordance with Rule 16b-3(f) resulting in acquisition or disposition of issuer securities
J Other acquisition or disposition
L Small acquisition under Rule 16a-6
M Exercise or conversion of derivative security exempted pursuant to Rule 16b-3
O Exercise of out-of-the-money derivative security
P Open market or private purchase of non-derivative or derivative security
S Open market or private sale of non-derivative or derivative security
U Disposition pursuant to a tender of shares in a change of control transaction
W Acquisition or disposition by will or the laws of descent and distribution
X Exercise of in-the-money or at-the-money derivative security
Z Deposit into or withdrawal from voting trust

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