Skip to main content
China Oilfield Services Limited logo

China Oilfield Services Limited — Investor Relations & Filings

Ticker · 2883 HKEX Mining and quarrying
Open in API
Filings indexed 1,859 across all filing types
Latest filing 2026-03-24 Regulatory Filings
Country HK Hong Kong
Listing HKEX 2883

About China Oilfield Services Limited

http://www.cosl.com.cn

China Oilfield Services Limited (COSL) is a large-scale integrated oilfield service provider and the core services arm of the CNOOC Group. COSL offers comprehensive solutions spanning all phases of oil and gas exploration, development, and production, primarily focusing on the Asian offshore market. Its operations are divided into four major segments: geophysical services, drilling services, well services (including oilfield technology development and well testing), and marine support services. COSL utilizes a diverse fleet of assets, including jack-up, semi-submersible, and land drilling rigs, to deliver specialized technical solutions.

Recent filings

Filing Released Lang Actions
An announcement has just been published by the issuer in the Chinese section of this website, a corresponding version of which may or may not be published in this section.
Regulatory Filings Classification · 1% confidence The document is a short notice titled “Overseas Regulatory Announcement” indicating that an announcement has been published in the Chinese section of the issuer’s website. It does not contain full financial data or meeting materials, but is rather a regulatory announcement notification, fitting the fallback category for miscellaneous regulatory filings.
2026-03-24 English
An announcement has just been published by the issuer in the Chinese section of this website, a corresponding version of which may or may not be published in this section.
Report Publication Announcement Classification · 1% confidence The document is extremely short (592 characters) and contains only a placeholder notice stating that an announcement has just been published in the Chinese section of the issuer’s website. There is no substantive content or financial data, and it simply indicates the publication of another filing. Under the “menu vs meal” rule, this is not the report itself but an announcement of its publication. Therefore, it is classified as a Report Publication Announcement.
2026-03-24 English
An announcement has just been published by the issuer in the Chinese section of this website, a corresponding version of which may or may not be published in this section.
Report Publication Announcement Classification · 1% confidence The document is very short (under 600 characters) and does not contain substantive financial or governance content itself. It merely states that an announcement has been published in the Chinese section of the website. This indicates it is not the full report or financial data but a notice about the publication of another document. Under the “Menu vs Meal” rule, this is a Report Publication Announcement (RPA).
2026-03-24 English
An announcement has just been published by the issuer in the Chinese section of this website, a corresponding version of which may or may not be published in this section.
Report Publication Announcement Classification · 1% confidence The document is extremely short and simply states that an overseas regulatory announcement has just been published in the Chinese section of the issuer’s website. It does not contain substantive financial data or detailed disclosures itself, but merely announces the release of another document. Under the “menu vs meal” rule, this is a Report Publication Announcement (RPA), as it notifies readers of the publication of a report rather than being the report content.
2026-03-24 English
An announcement has just been published by the issuer in the Chinese section of this website, a corresponding version of which may or may not be published in this section.
Regulatory Filings Classification · 1% confidence The document is a brief notice (under 1,000 characters) indicating that an "Overseas Regulatory Announcement" has just been published by the issuer in the Chinese section of the website, with no substantive content of its own. It is a generic regulatory notice and does not fit any of the more specific categories. As such, it falls under the fallback category for miscellaneous regulatory announcements.
2026-03-24 English
An announcement has just been published by the issuer in the Chinese section of this website, a corresponding version of which may or may not be published in this section.
Report Publication Announcement Classification · 1% confidence The document is very short and simply states that an announcement has just been published by the issuer in the Chinese section of the website, without providing any substantive financial data or full report content. It is a notice of publication rather than a full filing (e.g., Annual Report, Interim Report, or Regulatory Detail). This matches the description of a Report Publication Announcement (RPA).
2026-03-24 English

Report missing filing

Can't find a specific document? Let us know and we'll add it within 24 hours.

We will notify you once the filing is added.
Report sent
Thank you. We will check the data and update it shortly.