China Oilfield Services Limited
China Oilfield Services Limited (中海油田服务股份有限公司) is a joint-stock limited company incorporated in the People’s Republic of China on 1 January 2001, formed as part of the restructuring of China National Offshore Oil Corporation ahead of the company’s 2002 stock exchange listings. Its registry status is recorded as Active. The company’s own website lists its business address as No. 201 Haiyou Street, Yanjiao Economic and Technological Development Zone, Sanhe, Hebei Province, while earlier corporate filings and interim reports record a registered office in the Tanggu Ocean Hi-tech Zone of Tianjin; both addresses have been used in connection with the same listed group.
China Oilfield Services Limited provides offshore oilfield services spanning the full lifecycle of oil and gas exploration, development and production. Its principal service lines are geophysical acquisition and surveying, drilling services, well services such as logging, cementing and directional drilling, and marine support services including supply, anchor-handling and towage vessels.
The company’s shares are dual-listed: H-shares trade on the Hong Kong Stock Exchange under stock code 2883, and A-shares trade on the Shanghai Stock Exchange under stock code 601808. China Oilfield Services Limited serves offshore projects in Chinese waters as well as international customers, with reported operations across more than 20 countries and regions, including Southeast Asia, the Middle East and Central Asia. Its Norway-based subsidiary, COSL Drilling Europe AS, operates offshore drilling rigs from Stavanger.
For the financial year ended 31 December 2024, the group reported consolidated revenue of RMB 48,301.6 million, an increase of 9.5% year-on-year, and consolidated net profit of RMB 3,399.1 million, up 3.5% year-on-year, according to its own annual results announcement published in March 2025. These figures relate to the consolidated group rather than the standalone parent entity.
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- Digitized company financials
- Firmographics — websites, social profiles, revenue and employee estimates
Shareholders
5
Public share-register data collected for China Oilfield Services Limited identifies a number of institutional index and exchange-traded funds as disclosed shareholders, each typically holding low single-digit percentages of total share capital. The company’s controlling shareholder is China National Offshore Oil Corporation (CNOOC Group), which held 2,426,857,300 shares, equivalent to approximately 50.86% of total issued share capital, as of 10 October 2025, according to a stock-exchange disclosure summarised by Shanghai Securities News. CNOOC Group has been increasing this holding through an on-market share-purchase programme running on the Shanghai and Hong Kong exchanges since April 2025, which it extended in October 2025 to run until 8 April 2027, targeting a cumulative additional investment of RMB 300 million to RMB 500 million.
Ultimate beneficial ownership
China National Offshore Oil Corporation is a corporate entity and a wholly state-owned enterprise, not a natural person, so it cannot itself be described as an ultimate beneficial owner. Authoritative sources describe CNOOC Group as owned by the government of the People’s Republic of China, with the State-owned Assets Supervision and Administration Commission of the State Council (SASAC) exercising shareholder rights on the state’s behalf. No natural-person ultimate beneficial owner of China Oilfield Services Limited was identified in the sources reviewed for this profile.
Data availability
Shareholder disclosure for Hong Kong- and Shanghai-listed companies is generally strong, but the information gathered for this profile is classified as Partial: it captures the controlling shareholder’s stake and several minor institutional holders, but not a complete register of all disclosed shareholders as of a single reporting date.
Sources
- Shanghai Securities News (paper.cnstock.com) – CNOOC Group shareholding increase disclosure, retrieved 2026
- Hong Kong Stock Exchange (HKEXnews) – listed company announcements, retrieved 2026
- SASAC (State-owned Assets Supervision and Administration Commission) – China National Offshore Oil Corporation company overview, retrieved 2026
| Shareholder | Type | Holding | Source Document |
|---|---|---|---|
| VANGUARD Intl Eqy. INDEX Fd.S-Vanguard Emerging Markets Stock Index Fd | 9.9% | SAMR — public search via GSXT (National Enterprise Credit Information Publicity System) | |
| iShares MSCI China ETF | 2.6% | SAMR — public search via GSXT (National Enterprise Credit Information Publicity System) | |
| DFA Investment Dimensions-DFA Emerging Mkts Value | 2.4% | SAMR — public search via GSXT (National Enterprise Credit Information Publicity System) | |
| SPDR INDEX SHARES FUNDS-SPDR Portfolio Emerging Markets ETF | 2.2% | SAMR — public search via GSXT (National Enterprise Credit Information Publicity System) | |
| iShares Trust-iShares MSCI China ETF | 1.8% | SAMR — public search via GSXT (National Enterprise Credit Information Publicity System) |
Officers
5
According to China Oilfield Services Limited’s most recent quarterly filing reviewed for this profile (first-quarter 2026 report), the board comprised executive directors Zhao Shunqiang (Chairman) and Lu Tao, employee representative director Xiao Jia, non-executive directors Fan Baitao and Liu Qiudong, and independent non-executive directors Chiu Lai Kuen Susanna, Kwok Lam Kwong Larry and Yao Xin. Senior management roles publicly disclosed include Vice President and General Counsel/Chief Compliance Officer, Head of Accounting, and Vice President and Board Secretary. Nationality is not disclosed for any officer in the sources reviewed; country of residence is reported as China for the executive team. This overview reflects information current to mid-2026 and does not capture every historical appointment.
Recent officer changes
- Zhao Shunqiang resigned as Chairman, Executive Director and Chief Executive Officer of China Oilfield Services Limited effective 30 June 2026, in connection with a change in his work arrangements, per a Hong Kong Stock Exchange announcement dated 30 June 2026.
- Liu Jianzhong was appointed Chief Executive Officer effective 30 June 2026 and was subsequently elected Executive Director and Chairman of the company at an extraordinary general meeting held on 29 July 2026.
- Shang Jie was appointed President effective 30 June 2026 and was subsequently elected Executive Director at the same extraordinary general meeting on 29 July 2026.
Data availability
Officer information for Hong Kong- and Shanghai-listed companies such as China Oilfield Services Limited is classified as Partial: current directors and senior management are publicly disclosed through stock-exchange announcements and annual reports, but nationality is not disclosed and complete historical appointment and resignation records were not obtained for this profile.
Sources
- Hong Kong Stock Exchange (HKEXnews) – announcement of board and management changes dated 30 June 2026, and related listed-company filings, retrieved 2026
- China Oilfield Services Limited first-quarter 2026 report, retrieved 2026
- Financial news coverage referencing the official HKEX announcement (TipRanks, Futu, Moomoo), retrieved 2026
Get complete shareholder and officer records, ultimate beneficial owner resolution, and ongoing ownership monitoring.
Frequently Asked Questions
What does China Oilfield Services Limited do?
China Oilfield Services Limited (COSL) provides offshore oilfield services across geophysical acquisition and surveying, drilling services, well services and marine support, covering the full lifecycle of oil and gas exploration, development and production in Chinese offshore waters and international markets.
Who owns China Oilfield Services Limited?
China Oilfield Services Limited's controlling shareholder is China National Offshore Oil Corporation (CNOOC Group), which held approximately 50.86% of total share capital (2,426,857,300 shares) as of 10 October 2025.
Who is China Oilfield Services Limited's UBO (Ultimate Beneficial Owner)?
China Oilfield Services Limited is majority owned by the state-owned China National Offshore Oil Corporation, which is itself wholly state-owned via SASAC under the State Council of the People's Republic of China; no natural-person ultimate beneficial owner is disclosed.
Is China Oilfield Services Limited still an active company?
China Oilfield Services Limited's status on SAMR — public search via GSXT (National Enterprise Credit Information Publicity System) is listed as active.
When was China Oilfield Services Limited incorporated?
China Oilfield Services Limited was incorporated on 1 January 2001, according to SAMR — public search via GSXT (National Enterprise Credit Information Publicity System).
What is China Oilfield Services Limited's registered address?
The registered address on file for China Oilfield Services Limited is Sanhe, China.
What is China Oilfield Services Limited's revenue?
China Oilfield Services Limited reported consolidated revenue of RMB 48,301.6 million for the financial year ended 31 December 2024, up 9.5% year-on-year, with consolidated net profit of RMB 3,399.1 million.
Is China Oilfield Services Limited listed on a stock exchange?
China Oilfield Services Limited is dual-listed: H-shares trade on the Hong Kong Stock Exchange (stock code 2883) and A-shares trade on the Shanghai Stock Exchange (stock code 601808).
Who are the officers/directors of China Oilfield Services Limited?
China Oilfield Services Limited's Chairman, Executive Director and CEO Zhao Shunqiang stepped down effective 30 June 2026; Liu Jianzhong was appointed CEO and later elected Chairman, and Shang Jie was appointed President and later elected Executive Director, both effective from mid-2026 changes.
Does China Oilfield Services Limited have a parent company or subsidiaries?
China Oilfield Services Limited's controlling parent is China National Offshore Oil Corporation (CNOOC Group); Hong Kong-listed CNOOC Limited is a verified sister company under the same parent; confirmed subsidiary COSL Drilling Europe AS operates offshore drilling rigs in Norway.
Can Zavia monitor changes to China Oilfield Services Limited's ownership over time?
This profile reflects a point-in-time snapshot from SAMR — public search via GSXT (National Enterprise Credit Information Publicity System). Zavia's monitoring API can track changes to China Oilfield Services Limited's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access China Oilfield Services Limited's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including China, so records like China Oilfield Services Limited's registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from SAMR — public search via GSXT (National Enterprise Credit Information Publicity System) and was last synced on 11 August 2026.