United Kingdom

Top 63 largest UK Companies in the Oil & Gas E&P industry by Market Cap

This is the list of the largest public listed companies in the Oil & Gas E&P industry from the United Kingdom by market capitalization with links to their reference stock.

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Top Oil & Gas E&P Companies from the United Kingdom as of Jan. 01, 2026

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Rank Company Market Cap (USD) Country Sector Industry
1 Caspian Sunrise plc $9.99 B United Kingdom UK Energy UK Oil & Gas E&P
2 Energean plc $2.24 B United Kingdom UK Energy UK Oil & Gas E&P
3 President Energy plc $1.00 B

(Jan. 1, 2024)

 United Kingdom UK Energy UK Oil & Gas E&P
4 RAK Petroleum plc $999.9 M

(Oct. 1, 2022)

 United Kingdom UK Energy UK Oil & Gas E&P
5 Serica Energy plc $937.6 M United Kingdom UK Energy UK Oil & Gas E&P
6 Rockhopper Exploration plc $621.6 M United Kingdom UK Energy UK Oil & Gas E&P
7 Warrego Energy Limited $293.7 M

(March 1, 2023)

 United Kingdom UK Energy UK Oil & Gas E&P
8 EnQuest plc $272.2 M United Kingdom UK Energy UK Oil & Gas E&P
9 Genel Energy plc $225.7 M United Kingdom UK Energy UK Oil & Gas E&P
10 Savannah Energy plc $211.2 M United Kingdom UK Energy UK Oil & Gas E&P
11 Phoenix Global Resources plc $208.5 M

(Sept. 1, 2022)

 United Kingdom UK Energy UK Oil & Gas E&P
12 Hurricane Energy plc $197.2 M

(June 1, 2023)

 United Kingdom UK Energy UK Oil & Gas E&P
13 Cairn Energy plc $172.6 M United Kingdom UK Energy UK Oil & Gas E&P
14 Pantheon Resources plc $161.8 M United Kingdom UK Energy UK Oil & Gas E&P
15 i3 Energy plc $149.3 M

(July 1, 2024)

 United Kingdom UK Energy UK Oil & Gas E&P
16 PetroNor E&P Ltd $139.4 M

(July 1, 2024)

 United Kingdom UK Energy UK Oil & Gas E&P
17 Tullow Oil plc $129.4 M United Kingdom UK Energy UK Oil & Gas E&P
18 Afentra PLC $126.7 M United Kingdom UK Energy UK Oil & Gas E&P
19 Pharos Energy plc $114.9 M United Kingdom UK Energy UK Oil & Gas E&P
20 Borders & Southern Petroleum plc $113.1 M United Kingdom UK Energy UK Oil & Gas E&P
21 Enwell Energy plc $77.1 M

(July 1, 2025)

 United Kingdom UK Energy UK Oil & Gas E&P
22 Zephyr Energy plc $73.4 M

(July 1, 2025)

 United Kingdom UK Energy UK Oil & Gas E&P
23 Wentworth Resources plc $67.3 M

(July 1, 2023)

 United Kingdom UK Energy UK Oil & Gas E&P
24 Upland Resources Limited $63.5 M United Kingdom UK Energy UK Oil & Gas E&P
25 Jersey Oil and Gas plc $59.1 M

(July 1, 2025)

 United Kingdom UK Energy UK Oil & Gas E&P
26 Longboat Energy plc $50.7 M United Kingdom UK Energy UK Oil & Gas E&P
27 Predator Oil & Gas Holdings plc $34.2 M United Kingdom UK Energy UK Oil & Gas E&P
28 Chariot Ltd. $32.4 M United Kingdom UK Energy UK Oil & Gas E&P
29 Sound Energy plc $28.7 M United Kingdom UK Energy UK Oil & Gas E&P
30 Europa Oil & Gas (Holdings) plc $28.4 M United Kingdom UK Energy UK Oil & Gas E&P

Top Oil & Gas E&P Companies from the United Kingdom as of Jan. 01, 2026

1. Caspian Sunrise plc

Company Profile: Caspian Sunrise plc
Market Cap (USD): $9.99 B
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

2. Energean plc

Company Profile: Energean plc
Market Cap (USD): $2.24 B
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

3. President Energy plc

Company Profile: President Energy plc
Market Cap (USD): $1.00 B (Jan. 1, 2024)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

4. RAK Petroleum plc

Company Profile: RAK Petroleum plc
Market Cap (USD): $999.9 M (Oct. 1, 2022)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

5. Serica Energy plc

Company Profile: Serica Energy plc
Market Cap (USD): $937.6 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

6. Rockhopper Exploration plc

Company Profile: Rockhopper Exploration plc
Market Cap (USD): $621.6 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

7. Warrego Energy Limited

Company Profile: Warrego Energy Limited
Market Cap (USD): $293.7 M (March 1, 2023)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

8. EnQuest plc

Company Profile: EnQuest plc
Market Cap (USD): $272.2 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

9. Genel Energy plc

Company Profile: Genel Energy plc
Market Cap (USD): $225.7 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

10. Savannah Energy plc

Company Profile: Savannah Energy plc
Market Cap (USD): $211.2 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

11. Phoenix Global Resources plc

Company Profile: Phoenix Global Resources plc
Market Cap (USD): $208.5 M (Sept. 1, 2022)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

12. Hurricane Energy plc

Company Profile: Hurricane Energy plc
Market Cap (USD): $197.2 M (June 1, 2023)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

13. Cairn Energy plc

Company Profile: Cairn Energy plc
Market Cap (USD): $172.6 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

14. Pantheon Resources plc

Company Profile: Pantheon Resources plc
Market Cap (USD): $161.8 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

15. i3 Energy plc

Company Profile: i3 Energy plc
Market Cap (USD): $149.3 M (July 1, 2024)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

16. PetroNor E&P Ltd

Company Profile: PetroNor E&P Ltd
Market Cap (USD): $139.4 M (July 1, 2024)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

17. Tullow Oil plc

Company Profile: Tullow Oil plc
Market Cap (USD): $129.4 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

18. Afentra PLC

Company Profile: Afentra PLC
Market Cap (USD): $126.7 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

19. Pharos Energy plc

Company Profile: Pharos Energy plc
Market Cap (USD): $114.9 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

20. Borders & Southern Petroleum plc

Company Profile: Borders & Southern Petroleum plc
Market Cap (USD): $113.1 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

21. Enwell Energy plc

Company Profile: Enwell Energy plc
Market Cap (USD): $77.1 M (July 1, 2025)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

22. Zephyr Energy plc

Company Profile: Zephyr Energy plc
Market Cap (USD): $73.4 M (July 1, 2025)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

23. Wentworth Resources plc

Company Profile: Wentworth Resources plc
Market Cap (USD): $67.3 M (July 1, 2023)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

24. Upland Resources Limited

Company Profile: Upland Resources Limited
Market Cap (USD): $63.5 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

25. Jersey Oil and Gas plc

Company Profile: Jersey Oil and Gas plc
Market Cap (USD): $59.1 M (July 1, 2025)
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

26. Longboat Energy plc

Company Profile: Longboat Energy plc
Market Cap (USD): $50.7 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

27. Predator Oil & Gas Holdings plc

Company Profile: Predator Oil & Gas Holdings plc
Market Cap (USD): $34.2 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

28. Chariot Ltd.

Company Profile: Chariot Ltd.
Market Cap (USD): $32.4 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

29. Sound Energy plc

Company Profile: Sound Energy plc
Market Cap (USD): $28.7 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

30. Europa Oil & Gas (Holdings) plc

Company Profile: Europa Oil & Gas (Holdings) plc
Market Cap (USD): $28.4 M
Country: United Kingdom
Sector: UK Energy
Industry: UK Oil & Gas E&P

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