Roc Oil Company
Australian independent oil and gas company with upstream exploration, development and production activities.
Last updated August 26, 2026
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Overview
Roc Oil Company is an Australian independent oil and gas company headquartered in Sydney. The business was created by John Doran in the mid-1990s to pursue oil and natural-gas exploration, development and production opportunities across Australia, Asia, Africa, the Middle East and Europe. It began as a privately owned venture with no producing assets, working capital or established operating partners, then used a 1999 Australian Securities Exchange listing and associated capital raising to assemble an international upstream portfolio. Its early expansion included the acquisition of interests in the United Kingdom, most notably the Saltfleetby gas field in Lincolnshire. The field became an important onshore gas asset and was later sold to a subsidiary associated with Wintershall and Gazprom. Proceeds from that divestment supported development and exploration in other regions, including the Chinguetti oil field offshore Mauritania and the Cliff Head oil field offshore Western Australia. Roc also obtained interests in projects in China, Malaysia and Angola, making the company a geographically diversified but relatively small producer compared with major international oil companies. Roc became publicly traded in Australia in 1999 and added a London Alternative Investment Market listing in 2004. Its corporate development included a proposed acquisition of Gulfstream Resources Canada in 2001, later capital raisings, asset sales and a major combination with Anzon Australia. The 2008 merger increased Roc's exposure to Australian oil production and gave it control of a substantial interest in Anzon Australia. The same year, founder and chief executive John Doran died after a sudden illness, and chief operating officer Bruce Clement succeeded him as chief executive. The company's portfolio included exploration and production activity in the Beibu Gulf offshore China, the Perth Basin and Canning Basin in Western Australia, the Cabinda area of Angola, offshore Mauritania and other international locations. Some exploration campaigns produced discoveries, while others were curtailed after disappointing drilling results. In Western Australia, Roc participated in the Cliff Head oil field and later acquired a 50 percent interest in the Ungani oil field and related exploration permits from Buru Energy. Roc subsequently sold its Cliff Head interest in 2017 to release cash for other exploration priorities, particularly in China. In 2014, Fosun International acquired Roc through its subsidiary Transcendent Resources. The cash takeover followed a proposed merger of equals with Horizon Oil and gave Fosun an entry into the upstream oil and gas sector. Hainan Mining later acquired a 51 percent stake in Roc from Fosun in 2019 and purchased the remaining 49 percent in 2023. Roc therefore moved from a publicly traded independent explorer and producer to a privately controlled upstream company within a Chinese industrial group. In September 2024, Roc Oil Company Pty Limited announced a recommended cash offer for the shareholders of Tethys Oil AB, indicating continued strategic activity in the international upstream sector. The company's best-documented production base has included assets in Australia, China, Mauritania, Angola and Malaysia. In 2013, Roc reported production of approximately 2.7 million barrels of oil equivalent. Its current corporate structure, ownership and operational scope should be checked against the latest company and regulatory disclosures because the business has undergone multiple ownership changes and asset transactions.
History
Roc Oil Company was established in the mid-1990s by Australian oil executive and geologist John Doran. Before founding Roc, Doran had led Command Petroleum and was involved in its sale to Cairn Energy in 1996. Roc was designed as an independent upstream company capable of pursuing exploration, development and production opportunities across Australia, Asia, Africa, the Middle East and Europe. At the outset, Roc had no producing assets, working capital or operating partners. Its 1999 Australian Securities Exchange listing transformed the company into a funded public explorer. The listing raised approximately A$150 million, which Roc used to acquire interests in oil and gas properties, including assets in eastern England and the North Sea. The Saltfleetby gas field in Lincolnshire became the central British asset. Roc later sold the subsidiary holding Saltfleetby to a company associated with Wintershall and Gazprom, using the proceeds to support projects such as the Chinguetti field offshore Mauritania and the Cliff Head field offshore Western Australia. Roc expanded its access to capital by listing on London's Alternative Investment Market in 2004. Its international portfolio subsequently included interests in China, Malaysia, Angola and Mauritania, alongside Australian projects. Exploration outcomes varied. Work in the Beibu Gulf offshore China produced oil discoveries, while parts of the Perth Basin program produced gas discoveries that were not necessarily large enough to justify further development. In Angola, Roc operated and held a significant interest in an onshore Cabinda block, but several wells failed to find commercial quantities of oil and some wells were plugged and abandoned. The company pursued several transactions to reshape its portfolio. In 2001 it made an unsolicited proposal for Gulfstream Resources Canada, but Gulfstream rejected the offer. Roc also raised additional capital through a rights issue. In Australia, it became interested in Anzon and accumulated control before shareholders approved a merger in 2008. The transaction strengthened Roc's Australian production position and increased its crude-oil reserves. Doran died unexpectedly in 2008 at the age of 62. Bruce Clement, previously Roc's chief operating officer, became chief executive. The company continued to develop and divest assets while seeking a balance between exploration risk and near-term production. In 2013 it reported production of roughly 2.7 million barrels of oil equivalent. In 2014 Roc became the subject of competing strategic alternatives. Horizon Oil proposed a merger of equals, while Transcendent Resources, a subsidiary of Fosun International, made a cash takeover offer. Roc's board supported the Fosun-backed transaction, citing the cash premium and the strategic benefits of Fosun's entry into upstream oil and gas. The acquisition moved Roc from independent public-company ownership into the Fosun group. After the Fosun period, Hainan Mining acquired 51 percent of Roc in 2019 and the remaining 49 percent in 2023. Roc's Australian activities included a 50 percent interest in the Ungani oil field in Western Australia's Canning Basin, acquired from Buru Energy together with exploration interests. The company also sold its 42.5 percent Cliff Head interest in 2017, describing the divestment as a way to generate cash for other exploration priorities. In 2024, Roc Oil Company Pty Limited announced a recommended cash offer for Tethys Oil AB. The continuing ownership changes and transaction activity make current asset holdings and executive arrangements important areas for verification.
- 2024
Recommended offer for Tethys Oil
[1]Roc Oil Company Pty Limited announces a recommended cash offer for shareholders of Tethys Oil AB.
- 2023
Hainan Mining acquires the remaining ownership
[1]Hainan Mining purchases the remaining 49 percent interest in Roc.
- 2019
Hainan Mining acquires majority ownership
[1]Hainan Mining acquires a 51 percent shareholding in Roc from Fosun International.
- 2017
Cliff Head divestment
[1]Roc sells its 42.5 percent Cliff Head interest to Triangle (Perth Basin) and Royal Energy.
- 2014
Fosun acquires Roc Oil
[1]Transcendent Resources, a Fosun subsidiary, completes a cash acquisition after Roc favors the offer over a proposed Horizon Oil merger.
- 2013
Reported production reaches approximately 2.7 million barrels of oil equivalent
[1]Roc reports annual production of approximately 2.7 million barrels of oil equivalent across its upstream portfolio.
- 2008
Merger with Anzon Australia
[1]The approved merger expands Roc's Australian oil position and gives it control of a 53.1 percent interest in Anzon Australia.
- 2007
Perth Basin drilling campaign records discoveries
[1]The Frankland and Perseverance wells encounter gas, and the Dunsborough well records an oil and gas discovery in an offshore Perth Basin program.
- 2004
London AIM cross-listing
[1]Roc becomes cross-listed through admission to London's Alternative Investment Market.
- 2001
Gulfstream Resources Canada proposal
[1]Roc makes an unsolicited proposal to acquire a 40 percent interest in Gulfstream Resources Canada, but the proposal is rejected.
Products and positioning
Independent upstream oil and gas operator focused on acquiring, exploring, developing and producing hydrocarbon assets in Australia and selected international markets.
Hydrocarbon production
Crude oil
Crude oil was Roc's principal produced commodity. The company held or operated interests in producing and developing fields including Chinguetti offshore Mauritania, Cliff Head offshore Western Australia and Ungani in the Canning Basin. Production was generated through interests rather than through a consumer-facing branded fuel product.
Hydrocarbon production
Natural gas
Natural gas formed an important part of Roc's historical upstream portfolio. Its assets included the Saltfleetby gas field in the United Kingdom, which it later divested, as well as gas discoveries in the Perth Basin and exploration activity in China and Angola.
Upstream energy services · 1996
Oil and gas exploration and development
Roc's core business is the identification, appraisal, development and operation of upstream petroleum assets. Activities have included seismic and well programs, field development, production management, asset acquisitions and divestments across Australia and selected overseas jurisdictions.
Marketing campaigns
- 2015Ungani field development
Australia
Roc acquired a 50 percent interest in the Ungani oil field and associated exploration permits from Buru Energy, with development drilling beginning in Western Australia's Canning Basin.
Outcome. The field became a producing Australian asset operated through a 50/50 partnership with Buru Energy.
- 2014Beibu Gulf exploration drilling
China
Roc drilled two exploration wells in the Beibu Gulf and a sidetrack to evaluate the Jiaowei formation.
Outcome. One of the two exploration wells encountered oil, although the wells were ultimately plugged and abandoned in September 2014.
- 2007Offshore Perth Basin drilling program
Australia
Roc participated in a three-well offshore Perth Basin program involving the Frankland, Perseverance and Dunsborough wells.
Outcome. Frankland and Perseverance encountered gas, while Dunsborough produced an oil and gas discovery. Frankland was plugged and abandoned after being assessed as a small gas discovery.
- 2006Beibu Gulf appraisal drilling
China
Roc drilled a sidetrack appraisal well in the Beibu Gulf offshore China. Preliminary testing reported combined oil production of approximately 5,700 barrels per day from three columns.
Outcome. The campaign confirmed the presence of oil and supported continued evaluation of the Chinese portfolio.
Brand decisions
2017
Divestment of Cliff Head interestStrategyBackground
Roc aimed to generate liquidity for exploration and to place greater emphasis on other areas, particularly China.
Action taken
Roc sold its 42.5 percent interest in the Cliff Head oil field to Triangle (Perth Basin) and Royal Energy.
Aftermath
The sale reduced Roc's interest in the Western Australian field and supplied cash for other exploration priorities.
Reported consideration. US$3.75 million (2017)
2014
Acceptance of Fosun takeover over Horizon mergerM&ABackground
Horizon Oil had proposed a merger of equals, but Transcendent Resources, a Fosun International subsidiary, offered to acquire Roc for cash.
Action taken
Roc accepted Fosun's recommended offer rather than proceeding with the proposed Horizon combination.
Aftermath
Roc left the public markets and became part of Fosun's upstream oil and gas platform.
Cash takeover offer. A$474 million, or A$0.69 per share (2014)
2008
Merger with Anzon AustraliaM&ABackground
Roc pursued Anzon to increase its Australian crude-oil reserves and production exposure.
Action taken
Shareholders approved a merger valued at approximately A$600 million, combining Roc with Anzon Australia.
Aftermath
The transaction gave Roc control of a 53.1 percent interest in Anzon Australia and expanded its Australian upstream position.
Reported merger value. A$600 million (2008)
2005
Sale of Saltfleetby gas-field subsidiaryOtherBackground
Roc sought to recycle capital from its United Kingdom gas portfolio into development projects in Mauritania, Western Australia and other target regions.
Action taken
The company sold the subsidiary holding the Saltfleetby gas field to a business associated with Wintershall and Gazprom.
Aftermath
The transaction provided funds for development of the Chinguetti and Cliff Head projects and reduced Roc's exposure to the UK gas market.
Reported sale consideration. A$110 million (2005)
Recent events
Roc Oil completes acquisition of EOG China[2]
Hainan Mining said its overseas-controlled subsidiary Roc Oil completed the acquisition of 100% of EOG China, which holds operating interests in the Bajiaochang gas field.
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