ZEPHYR ENERGY PLC

Pantheon Resources plcPTHRF · Oil & GasLondon, United Kingdom

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Pantheon Resources Plc, operating through its various subsidiaries, is engaged in the exploration and extraction of oil and gas resources primarily within the United States. Its portfolio prominently features the Greater Alkaid project, which encompasses 22,804 acres in Alaska, and the Talitha project, spanning approximately 44,463 acres. This company was established in 2005 and maintains its principal executive offices in London, United Kingdom.

CHK OIL00632 · Oil & GasTsim Sha Tsui, Hong Kong

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Operating as an investment holding firm, CHK Oil Limited is primarily involved in the upstream oil and natural gas sector, spanning exploration, development, production, and sales activities. Its operations extend across Hong Kong, the United States, and the People's Republic of China, including a significant exploitation stake in the Utah Gas and Oil Field project located in Utah, USA. Beyond its core energy pursuits, the company also engages in the trading of petroleum and related commodities, alongside providing various corporate services. The firm was rebranded as CHK Oil Limited in February 2020, having previously operated under the name Pearl Oriental Oil Limited. Its corporate headquarters are situated in Tsim Sha Tsui, Hong Kong, and it functions as a subsidiary of Xin Hua Petroleum (Hong Kong) Limited.

Buccaneer Energy plc., together with its subsidiaries, engages in the exploitation of hydrocarbon resources in the United States. The company offers modern 3D seismic technology. It also holds 100% working interest in the Pine Mills oil-producing asset that covers an area of approximately 2,400 acres; and production and development assets and injection wells. The company was formerly known as Nostra Terra Oil and Gas Company plc and changed its name to Buccaneer Energy plc. in June 2025. Buccaneer Energy plc. was incorporated in 2005 and is headquartered in London, the United Kingdom.

Headquartered in London, United Kingdom, Sound Energy plc was established in 2005. Operating through its subsidiaries, the company specializes in the exploration, evaluation, and development of oil and natural gas properties. Its primary assets include a 75% ownership in several Moroccan licenses located in the eastern region: the Greater Tendrara license (14,411 square kilometers), the Anoual license (8,873 square kilometers), and the Tendrara production concession (133.5 square kilometers). Furthermore, the company possesses the Sidi Mokhtar license, encompassing 4,712 square kilometers in Southern Morocco. This entity rebranded from Sound Oil Plc to Sound Energy plc in September 2015.

TomCo Energy Plc is an enterprise primarily focused on the exploration and development of oil shale resources, with operations concentrated in both the United Kingdom and the United States. The company boasts complete ownership of nine critical oil shale leases, which together span approximately 15,488 acres within Uintah County, Utah. Its corporate headquarters are located in Douglas, Isle of Man.

PENNPETRO ENERGY PLCPPP · Oil & GasLondon, United Kingdom

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Pennpetro Energy Plc operates in the United States, focusing on the domestic exploration and extraction of onshore oil and gas. Its primary asset is the undeveloped core of the Gonzales oil field, situated in Gonzales, Texas. This property encompasses around 1,000 lease agreements for petroleum mineral rights, covering a total area of 2,500 acres. Established in 2016, the company's headquarters are located in London, United Kingdom.