| 1 | Kca Deutag Drilling LIMITED | Iraq | Basra | Artawi Road | Al Basrah | N/A | N/A | 2011 | $98,122,169,273 | 92 | N/A | N/A | 2996 |
| 2 | PT. Pertamina (persero) | Indonesia | Dki Jakarta | Grha Pertamina | Special Capital Region of Jakarta | 10110 | N/A | 1957 | $75,327,000,000 | 2,163 | N/A | N/A | AHU-AH.01.09-030 |
| 3 | SPA Sonatrach | Algeria | Hydra | Djenane el Malik | Wilaya D'Alger | 16035 | N/A | 1963 | $53,694,702,000 | 65,991 | N/A | N/A | 00B0013767 |
| 4 | Timor Gap, E.P | Easttimor | Dili | 3rd Floor | Dili | N/A | N/A | 2011 | $48,025,000,000 | 135 | N/A | N/A | N/A |
| 5 | Schlumberger LIMITED | USA | Houston | 5599 San Felipe St Fl 17 | Harris | 77056 | slb.***** | 1926 | $36,289,000,000 | 110,000 | N/A | N/A | N/A |
| 6 | PT. Kilang Pertamina Internasional | Indonesia | Dki Jakarta | Pertamina Main Building 14th Floor | Special Capital Region of Jakarta | 10110 | N/A | 2017 | $31,741,104,000 | 6,200 | N/A | N/A | AHU-AH.01.09-010 |
| 7 | Sinopec Oilfield Service CORPORATION | Hongkong | Central | 26/f Jardine Hse | Central & Western District | N/A | N/A | 1994 | $11,192,651,199 | 44 | N/A | N/A | 17988673 |
| 8 | China Oilfield Services LIMITED (unofficial Translation) | Hongkong | Central | 65/f Bank of China Twr | Central & Western District | N/A | N/A | 2002 | $6,666,439,305 | 44 | N/A | N/A | 33038591 |
| 9 | Halliburton Guyana, INC. | Guyana | Georgetown | 103 Carmichael Street | N/A | N/A | N/A | 2015 | $6,605,717,184 | 57,024 | N/A | N/A | 8150 |
| 10 | Patterson-Uti Energy, INC. | USA | Houston | 10713 W Sam Houston Pkwy N Ste 800 | Harris | 77064 | patenergy.***** | 1978 | $5,377,911,000 | 9,200 | N/A | N/A | 2355146 |
| 11 | Cnpc Chuanqing Drilling Engineering CO., LTD. | China | Chengdu | No.6 Mangchouwan Street, Chenghua District | Sichuan | 610051 | N/A | 2008 | $4,951,876,535 | 18,985 | N/A | N/A | 510000619570616 |
| 12 | Nabors Industries, INC. | USA | Houston | 515 W Greens Rd Ste 1200 | Harris | 77067 | nabors.***** | 1978 | $4,585,433,359 | 16,847 | N/A | N/A | 853632 |
| 13 | Antero Resources CORPORATION | USA | Denver | 1615 Wynkoop St | Denver | 80202 | anteroresources.***** | 2002 | $4,325,596,000 | 616 | N/A | N/A | 4520810 |
| 14 | Easternwell Group Assets PTY LTD | Australia | Groper Creek | 8-10 Russell Street | Queensland | 4350 | easternwell.***** | 2007 | $4,079,136,009 | 15,639 | N/A | N/A | 126227932 |
| 15 | Easternwell Group Operations PTY LTD | Australia | Groper Creek | 8-10 Russell Street | Queensland | 4350 | easternwell.***** | 2007 | $4,079,136,009 | 15,639 | N/A | N/A | 128179313 |
| 16 | Adnoc Drilling Company P.J.S.C. | United Arab Emirates | Abu Dhabi | Skec 2, Zone 1 - E-17 | Abu Dhabi | N/A | N/A | 2019 | $4,034,222,000 | 6,000 | N/A | N/A | CN-2688881 |
| 17 | Pdc Energy, INC. | USA | Denver | 1099 18th St Ste 1500 | Denver | 80202 | pdce.***** | 2023 | $3,845,733,000 | 520 | N/A | N/A | 5760896 |
| 18 | Arc Resources LTD | Canada | Calgary | 1500 308-4 Ave Sw | Alberta | T2P 0H7 | arcresources.***** | 1996 | $3,634,730,368 | 464 | N/A | N/A | N/A |
| 19 | China National Logging CORPORATION | China | Xi'An | No.50 Zhangba 5th Road, Jinye 2nd Road, High-tech Development Di | Shaanxi | 710077 | N/A | 2002 | $2,950,259,441 | 11,311 | N/A | N/A | 610131100005419 |
| 20 | Helmerich & Payne, INC. | USA | Tulsa | 222 N Detroit Ave | Tulsa | 74103 | hpinc.***** | 1920 | $2,756,607,000 | 6,200 | N/A | N/A | 0388801 |
| 21 | Sinopec Petroleum Engineering & Construction CORPORATION | China | Beijing | Floor No.11, Building No.4, No. A6, Huixin E. Street, Chaoyang D | Beijing | 100099 | N/A | 2012 | $2,475,377,680 | 151 | N/A | N/A | 110000015474874 |
| 22 | Sinopec Oilfield Service Shengli CORPORATION | China | Dongying | No.125, Jinan Rd., Dongying District | Shandong | 257051 | N/A | 2012 | $2,338,035,031 | 15,109 | N/A | N/A | 370500000001512 |
| 23 | PT. Medco Energi Internasional TBK | Indonesia | Kebayoran Baru | Scbd, the Energy Building 53rd Floor | Special Capital Region of Jakarta | 12190 | medcoenergi.***** | 1980 | $2,249,337,000 | 3,365 | N/A | N/A | AHU-0035936.AH.0 |
| 24 | Midis Energy Services LIMITED | Nigeria | Port Harcourt | Plot 190/14b Senator George Sekibo Road | Rivers | N/A | N/A | 2015 | $2,131,906,524 | 105 | N/A | N/A | 639040 |
| 25 | PT. Pertamina Ep Cepu | Indonesia | Setia Budi | Patra Jasa Office Tower 5th-8th & 13th-14th Floor | Special Capital Region of Jakarta | 12950 | pepc-pertamina.***** | 2005 | $1,732,808,000 | 160 | N/A | N/A | AHU-AH.01.09-011 |
| 26 | Expro Group Holdings N.V. | USA | Houston | 1311 Broadfield Blvd Ste 400 | Harris | 77084 | expro.***** | 1938 | $1,712,802,000 | 8,500 | N/A | N/A | N/A |
| 27 | Ces Energy Solutions CORP | Canada | Calgary | 1400-332 6 Ave Sw | Alberta | T2P 0B2 | canadianenergyservices.***** | 1986 | $1,575,043,227 | 2,123 | N/A | N/A | N/A |
| 28 | Ensign Drilling INC | Canada | Calgary | 1000-400 5 Ave Sw | Alberta | T2P 0L6 | ensignenergy.***** | 1980 | $1,364,927,500 | 2,500 | N/A | N/A | N/A |
| 29 | Precision Drilling CORPORATION | Canada | Calgary | 525 8 Ave Sw Suite 800 | Alberta | T2P 1G1 | precisiondrilling.***** | 1951 | $1,356,040,273 | 4,337 | N/A | N/A | N/A |
| 30 | Ensign Energy Services INC | Canada | Calgary | 1000-400 5 Ave Sw | Alberta | T2P 0L6 | ensignenergy.***** | 1987 | $1,304,411,751 | 4,772 | N/A | N/A | N/A |
| 31 | Rn-Burenie, OOO | Russia | Moskva | D. 15 Str. 31 Etazh 4 Kom. 415, Ul. Malaya Kaluzhskaya | Moskva | 119071 | N/A | 2006 | $1,291,317,042 | 14,395 | N/A | N/A | 94475850 |
| 32 | Bke, OOO | Russia | Moskva | D. 40 K. 2, Ul. Narodnogo Opolcheniya | Moskva | 123298 | N/A | 1995 | $1,260,644,659 | 5,354 | N/A | N/A | 39355854 |
| 33 | Ranger Oil LLC | USA | Houston | 16285 Park Ten Pl Ste 500 | Harris | 77084 | rangeroil.***** | 2023 | $1,145,189,000 | 87 | N/A | N/A | 00169714 |
| 34 | Frontera Energy CORPORATION | Canada | Calgary | 1030 140 4 Ave Sw | Alberta | T2P 3N3 | N/A | 1996 | $1,129,891,000 | 1,376 | N/A | N/A | N/A |
| 35 | Egyptian Drilling Company Sae | Egypt | Cairo | Km 17.5, Cairo-suez Desert Road | Cairo | 11371 | egyptian-drilling.***** | 2017 | $1,111,570,000 | 5,000 | N/A | N/A | 178136 |
| 36 | Tecpetrol S.A. | Argentina | Cidade Autónoma de Buenos Aires | Ingeniero Carlos María della Paolera 297/99 | Ciudad Autónoma de Buenos Aires | C1001ADA | tecpetrol.***** | 1982 | $1,072,995,464 | 745 | N/A | N/A | 30592665472 |
| 37 | Diamond Offshore Drilling INC | USA | Houston | 15415 Katy Fwy Ste 100 | Harris | 77094 | diamondoffshore.***** | 2024 | $1,056,179,000 | 2,140 | N/A | N/A | 2193202 |
| 38 | Nabors Drilling Canada LIMITED | Canada | Calgary | 2800-500 4 Ave Sw | Alberta | T2P 2V6 | nabors.***** | 1951 | $1,022,603,683 | 1,873 | N/A | N/A | N/A |
| 39 | PT. Pertamina Hulu Energi | Indonesia | Pasar Minggu | Pertamina Hulu Energy (phe) Tower | Special Capital Region of Jakarta | 12520 | phe.***** | 2007 | $1,019,554,137 | 160 | N/A | N/A | AHU-AH.01.09-017 |
| 40 | Agl Gas Storage PTY LTD | Australia | Sydney | L 24 200 George St | New South Wales | 2000 | N/A | 1986 | $1,003,416,857 | 3,847 | N/A | N/A | 009203463 |
| 41 | Saipem Australia PTY LTD | Australia | Perth | 1101 Hay St | Western Australia | 6005 | saipem.***** | 1966 | $980,895,660 | 103 | N/A | N/A | 000544507 |
| 42 | Baker Hughes Oilfield Operations LLC | USA | Houston | 575 N Dairy Ashford Rd | Harris | 77079 | N/A | 1992 | $930,161,688 | 4,923 | N/A | N/A | 201715210251 |
| 43 | Arabian Drilling Company | Saudiarabia | Al Khobar | Prince Sultan Road, al Jawharah Area | Eastern Region | 31952 | arabdrill.***** | 2002 | $927,070,713 | 6,143 | N/A | N/A | 2051026089 |
| 44 | Trinidad Drilling LTD | Canada | Calgary | 400 5th Ave Suite 1000 | Alberta | T2P 0L6 | ensignenergy.***** | 2008 | $873,007,629 | 1,599 | N/A | N/A | N/A |
| 45 | Chevron Thailand Exploration And Production LIMITED | Thailand | Chatuchak | 19 Ratchadaphisek Road | Bangkok | 10900 | chevronthailand.***** | N/A | $857,528,017 | 44 | N/A | N/A | 0100536023947 |
| 46 | Jiangsu Geological Foundation Pile Engineering CO., LTD | China | Zhenjiang | No.64, Zhongshan E. Road, Jingkou District | Jiangsu | 212002 | N/A | 1987 | $805,706,959 | 3,089 | N/A | N/A | 320000000000221 |
| 47 | Shandong Senhe Construction Engineering Co.,ltd. | China | Dezhou | North of Zhangdazhuang Village, Linpan Town, Linyi County | Shandong | 251508 | N/A | 1989 | $805,706,959 | 87 | N/A | N/A | 371424018002176 |
| 48 | Karamay Boda Industry And Trade Co.,ltd. | China | Karamay | No.83, Shengli Road, Kelamayi District | Xinjiang | 834000 | N/A | 2003 | $805,706,959 | 3,089 | N/A | N/A | 650200030000522 |
| 49 | PT. Usaha Yaktapena | Indonesia | Matraman | Pertamina Building 8th Floor | Special Capital Region of Jakarta | 13140 | N/A | 1979 | $805,706,959 | 3,089 | N/A | N/A | AHU-87348.AH.01. |
| 50 | PT. Mi Indonesia | Indonesia | Mampang Prapatan | Wisma Mulia 46th Floor | Special Capital Region of Jakarta | 12710 | N/A | 1972 | $805,706,959 | 3,089 | N/A | N/A | AHU-AH.01.09-009 |