CNOOC Limited
Corporate brand
UnclaimedChina's largest producer of offshore crude oil and natural gas.
Last updated August 31, 2026
Overview
CNOOC Limited is a Hong Kong-listed Chinese oil and gas exploration and production company and a major subsidiary of China National Offshore Oil Corporation, the Chinese state-owned energy group commonly known as CNOOC. The listed company was established in 1999 as a Hong Kong-incorporated vehicle for placing selected offshore oil and gas assets of the CNOOC group into the public markets. Because it is incorporated in Hong Kong while controlled by a mainland Chinese state-owned parent, it is commonly described as a red-chip company. The company focuses primarily on upstream activities: the exploration, appraisal, development, production and sale of crude oil and natural gas. Its principal domestic operating areas include the Bohai Bay, the South China Sea and the East China Sea. Internationally, CNOOC Limited has built a portfolio spanning Asia, Africa, North America, South America and Oceania, giving it exposure to both offshore and other international oil and gas projects. Its business model is centered on finding and developing hydrocarbon reserves, operating producing assets and marketing the resulting petroleum and gas production rather than on being primarily a refining or retail-fuels company. CNOOC Limited is the listed arm most closely associated with the CNOOC group's traditional offshore upstream specialization. Within the broader Chinese petroleum sector, it is commonly discussed alongside PetroChina and Sinopec, the listed affiliates of China National Petroleum Corporation and China Petrochemical Corporation respectively. Those historical divisions of specialization have become less distinct over time as China's major energy groups have expanded across overlapping parts of the petroleum value chain, but CNOOC Limited remains particularly identified with offshore exploration and production. The company became publicly traded in Hong Kong in February 2001 and was added to the Hang Seng Index in July of the same year. It also traded in New York from 2001 until 2021 and in Toronto from 2013 until 2021, following the acquisition of Nexen Inc. The withdrawal of those overseas listings left Hong Kong as its principal public-market listing. CNOOC Limited's international expansion has included major asset acquisitions and participation in overseas petroleum projects, complementing its long-standing Chinese offshore portfolio. CNOOC Limited operates in a capital-intensive and cyclical industry affected by commodity prices, reserve performance, production costs, regulation, geopolitical conditions and the pace of the global energy transition. Its public identity therefore combines the scale and policy significance of a state-linked Chinese energy group with the reporting, governance and capital-market requirements of a listed international exploration and production company. In October 2024, it signed an Exploration, Development & Production Contract with Iraq's state-run Midland Oil Company, illustrating its continuing participation in overseas upstream opportunities. The company remains an active international oil and gas producer, with crude oil and natural gas as its core commercial outputs.
History
CNOOC Limited was created in 1999 by China National Offshore Oil Corporation as a Hong Kong-incorporated holding company intended to place a substantial portion of the state-owned group's petroleum assets into the public markets. The structure separated the listed operating company from its Beijing-based parent while preserving the parent's control. This arrangement made CNOOC Limited a characteristic red-chip issuer: a company incorporated outside mainland China but controlled by a mainland state-owned enterprise. The company's commercial foundation was China's offshore petroleum sector. Its domestic operations developed around the Bohai region, the South China Sea and the East China Sea, where it has pursued exploration, field development and production of crude oil and natural gas. CNOOC Limited's activities have covered the upstream project cycle, from identifying and evaluating resources to bringing fields into production and selling the resulting hydrocarbons. CNOOC Limited listed in Hong Kong in February 2001. It was added to the Hang Seng Index in July of that year, increasing its visibility among international investors. The company also obtained a New York Stock Exchange listing in 2001. These listings supported its international capital-markets profile and reflected the company's ambition to operate beyond China's domestic offshore base. Over time, the company expanded its geographic reach through overseas exploration, production interests and acquisitions. Its portfolio came to include assets in Asia, Africa, North America, South America and Oceania. The acquisition of Nexen Inc. in 2013 was a significant international expansion step. In connection with that transaction, CNOOC Limited was listed on the Toronto Stock Exchange, adding a market associated with Nexen's Canadian base and international investor presence. CNOOC Limited operates within China's group-based petroleum industry. CNOOC Group has traditionally been associated with offshore upstream exploration and production, while PetroChina and Sinopec have historically been more strongly identified with onshore production and refining and marketing. Those boundaries have become increasingly overlapping as China's major state-owned energy groups have broadened their activities, but CNOOC Limited continues to be distinguished by its offshore orientation and its international exploration and production portfolio. The company later ended its New York and Toronto listings in 2021, leaving Hong Kong as its principal stock-market venue. Its core business remained exposed to the normal opportunities and risks of the upstream oil and gas sector, including reserve replacement, production performance, commodity-price movements, project execution, environmental regulation and geopolitical conditions. CNOOC Limited also operates in an energy system undergoing gradual transition, although the company's documented commercial center remains petroleum and natural gas rather than a diversified consumer energy brand. In October 2024, CNOOC Limited signed an Exploration, Development & Production Contract with Iraq's Midland Oil Company. The agreement demonstrated the company's continuing willingness to pursue overseas upstream opportunities and its role as an international arm of China's offshore-focused petroleum group. Today, CNOOC Limited remains an active Hong Kong-listed oil and gas producer whose principal outputs are crude oil and natural gas and whose operating footprint combines major Chinese offshore regions with assets and projects across several overseas markets.
- 2024
Iraq exploration and production contract
[1]The company signed an Exploration, Development & Production Contract with Iraq's Midland Oil Company.
- 2021
End of New York and Toronto trading
[1]CNOOC Limited ceased its New York and Toronto exchange listings while continuing to trade in Hong Kong.
- 2013
Nexen acquisition and Toronto listing
[1]The acquisition of Nexen Inc. expanded the company's international portfolio and was followed by its Toronto Stock Exchange listing.
- 2001
Hong Kong listing
[1]CNOOC Limited was listed on the Hong Kong Stock Exchange in February 2001.
- 2001
Added to the Hang Seng Index
[1]The company became a constituent of the Hang Seng Index in July 2001.
- 2001
New York listing
[1]CNOOC Limited began trading on the New York Stock Exchange, a listing it retained until 2021.
- 1999
Listed-company vehicle incorporated
[1]CNOOC Limited was incorporated in Hong Kong to hold and publicly float selected assets of China National Offshore Oil Corporation.
Products and positioning
A state-linked Chinese energy company focused on offshore and international upstream oil and gas exploration, development and production.
Upstream petroleum
Crude oil
Crude oil is one of CNOOC Limited's principal commercial outputs. The company explores for, develops and produces oil from domestic Chinese offshore regions and international upstream assets. Its role is primarily that of an exploration and production operator or partner rather than a consumer-facing fuel retailer. Production volumes depend on reserve quality, field development schedules, operating conditions and the company's portfolio of domestic and overseas projects.
Upstream natural gas
Natural gas
Natural gas is a core product of CNOOC Limited's exploration and production business. Gas resources are developed through offshore and international upstream projects and sold into relevant markets through the company's commercial arrangements. The product reflects the company's position in the petroleum supply chain, where resource discovery, field development, production and sales are more central than downstream retail branding.
Energy operations
Offshore exploration and production services
CNOOC Limited's principal offering to the energy market is its upstream operating capability: identifying hydrocarbon resources, evaluating reserves, developing fields and producing oil and gas. Its domestic base includes the Bohai, South China Sea and East China Sea regions, while its international portfolio extends across multiple continents. This is an operating and asset-based business rather than a packaged consumer product line.
Brand decisions
2024
Enter Iraqi exploration and production contractStrategyBackground
CNOOC Limited continued to pursue international upstream opportunities beyond its established Chinese offshore operating areas.
Action taken
The company signed an Exploration, Development & Production Contract with Iraq's state-run Midland Oil Company.
Aftermath
The agreement reinforced the company's international exploration and production footprint.
2021
Withdraw from New York and Toronto listingsStrategyBackground
After trading in New York since 2001 and Toronto since 2013, CNOOC Limited changed its public-market footprint.
Action taken
The company ended its New York Stock Exchange and Toronto Stock Exchange listings while retaining its Hong Kong listing.
Aftermath
Hong Kong became the company's remaining principal listed market.
2013
Acquire Nexen Inc.M&ABackground
CNOOC Limited pursued international expansion by acquiring Nexen Inc., adding overseas oil and gas assets and increasing its presence in North American and other international markets.
Action taken
The company completed the Nexen acquisition and subsequently maintained a Toronto Stock Exchange listing.
Aftermath
The transaction broadened CNOOC Limited's international portfolio and became an important part of its overseas growth history.
Recent events
- 2024
CNOOC signs an Iraqi exploration, development and production contract[1]
Other
CNOOC Limited signed an Exploration, Development & Production Contract with Iraq's state-run Midland Oil Company, extending its participation in overseas upstream projects.
- 2021
CNOOC Limited ends its New York and Toronto listings[1]
Other
The company ceased trading on the New York Stock Exchange and Toronto Stock Exchange in 2021, while retaining its Hong Kong listing.
- 2013
CNOOC Limited acquires Nexen and expands its international portfolio[1]
M&A
Following its acquisition of Nexen Inc., CNOOC Limited became listed on the Toronto Stock Exchange and broadened its international upstream asset base.
- 2001
CNOOC Limited begins trading on the Hong Kong Stock Exchange[1]
Other
The company was listed on the Hong Kong Stock Exchange in February 2001 as the publicly traded vehicle for selected assets of China National Offshore Oil Corporation.
- 2001
CNOOC Limited joins the Hang Seng Index[1]
Other
CNOOC Limited was admitted as a constituent of the Hang Seng Index in July 2001, reflecting its position among major Hong Kong-listed companies.
Sources6 sources
- 1CNOOC Limiteden.wikipedia.org
- 2CNOOC Limited official websitecnoocltd.com
- 3体现央企担当！三大石油集团向湖北捐赠1.5亿tech.sina.com.cn
- 4CNOOC Limited Announces Bozhong 34-9 Oilfield Commences Productionbenzinga.com
- 5CNOOC Limited Announces Caofeidian 11-1/11-6 Oilfield Comprehensive Adjustment Project Commences Productibenzinga.com
- 6CNOOC Limited Appoints New CEOrigzone.com
Cite this profile: Cite the canonical profile. /brand-wiki/cnooc-limited · Editorial policy · How profiles are compiled