| 1 | ROMPETROL RAFINARE SA | Loc. Năvodari, Oraş Năvodari | Constanţa | 17.31 mld | 1.106 |
| 2 | PREMIER ENERGY TRADING S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 636.6 mil | 9 |
| 3 | FORAJ SONDE SA | Loc. Videle, Oraş Videle | Teleorman | 251.7 mil | 351 |
| 4 | NIS PETROL SRL | Bucureşti Sectorul 1 | Bucureşti | 205.5 mil | 42 |
| 5 | MAZARINE ENERGY ROMANIA SRL | Bucureşti Sectorul 1 | Bucureşti | 135.6 mil | 160 |
| 6 | STRATUM ENERGY ROMANIA LTD (NICOSIA SUCURSALA BUCURESTI) | Bucureşti Sectorul 1 | Bucureşti | 111.7 mil | 52 |
| 7 | EXPERT PETROLEUM SRL | Bucureşti Sectorul 1 | Bucureşti | 91.5 mil | 270 |
| 8 | ROHRER OIL & GAS SERVICES S.R.L. | Sat Tătărani, Comuna Bărcăneşti | Prahova | 82.3 mil | 327 |
| 9 | ENDURANCE LIFT SOLUTIONS INTERNATIONAL S.R.L. | Sat Negoieşti, Comuna Brazi | Prahova | 61.2 mil | 98 |
| 10 | AMROMCO ENERGY SRL | Municipiul Ploieşti | Prahova | 59.7 mil | 120 |
| 11 | IVONCO TRADE SRL | Bucureşti Sectorul 2 | Bucureşti | 35.2 mil | 17 |
| 12 | MICHAEL OIL&GAS SERVICES SRL | Sat Lipăneşti, Comuna Lipăneşti | Prahova | 25.0 mil | 34 |
| 13 | EVDANCO OGC SRL | Municipiul Târgovişte | Dâmboviţa | 14.4 mil | 12 |
| 14 | RTIME-GS SRL | Municipiul Bacău | Bacău | 11.8 mil | 5 |
| 15 | TIM-ICE COMPANY SRL | Municipiul Timişoara | Timiş | 10.4 mil | 7 |
| 16 | UTILITAR FLUID CONSTRUCT SRL | Sat Dezmir, Comuna Apahida | Cluj | 8.7 mil | 12 |
| 17 | BRENT EXPLORATION & PRODUCTION SRL | Sat Blejoi, Comuna Blejoi | Prahova | 8.1 mil | 22 |
| 18 | DRILLING EQUIPMENT SRL | Municipiul Zalău | Sălaj | 7.8 mil | 17 |
| 19 | BOLT POWER ROMANIA SRL | Bucureşti Sectorul 1 | Bucureşti | 7.4 mil | 23 |
| 20 | ENIT DOWNSTREAM SRL | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 6.0 mil | 17 |
| 21 | SERINUS ENERGY ROMANIA S.A. | Bucureşti Sectorul 1 | Bucureşti | 5.6 mil | 13 |
| 22 | AKCG INTERNAȚIONAL ZONE S.R.L. | Sat Dobroeşti, Comuna Dobroeşti | Ilfov | 4.5 mil | 1 |
| 23 | CONSTEHNO AL SRL | Municipiul Ploieşti | Prahova | 4.3 mil | 5 |
| 24 | AP INTERTEK SOLUTIONS SRL | Bucureşti Sectorul 2 | Bucureşti | 3.8 mil | 2 |
| 25 | CONSTEHNO WELL MANAGEMENT S.R.L. | Municipiul Ploieşti | Prahova | 3.7 mil | 3 |
| 26 | GEOLINK SRL | Municipiul Timişoara | Timiş | 3.4 mil | 13 |
| 27 | PADO GROUP INFRASTRUCTURES SRL | Municipiul Târgu Mureş | Mureş | 3.3 mil | 8 |
| 28 | QUICK DRILL S.R.L. | Municipiul Cluj-Napoca | Cluj | 2.6 mil | 2 |
| 29 | ASCO GLOBAL SOLUTIONS S.R.L. | Bucureşti Sectorul 5 | Bucureşti | 2.0 mil | 4 |
| 30 | SPENCO SRL | Loc. Zărneşti, Oraş Zărneşti | Braşov | 1.8 mil | 2 |
| 31 | ROCKWELL SERVICES S.R.L. | Sat Blejoi, Comuna Blejoi | Prahova | 1.8 mil | 8 |
| 32 | GREAT WESTERN GROUP S.R.L. | Sat Chişoda, Comuna Giroc | Timiş | 1.4 mil | 4 |
| 33 | FBM INNOVATIVE SERVICES SRL | Bucureşti Sectorul 1 | Bucureşti | 1.3 mil | 2 |
| 34 | AB DRILL S.R.L. | Municipiul Cluj-Napoca | Cluj | 1.2 mil | 1 |
| 35 | CDOG SERVICES S.R.L. | Sat Budiu Mic, Comuna Crăciuneşti | Mureş | 1.1 mil | 1 |
| 36 | EUREKA CONSULTING ENGINEERS SRL | Bucureşti Sectorul 1 | Bucureşti | 1.1 mil | 3 |
| 37 | INA DRILLING S.R.L. | Sat Cordun, Comuna Cordun | Neamţ | 1.1 mil | 3 |
| 38 | XCD SRL | Municipiul Târgu Mureş | Mureş | 979.4 mii | 7 |
| 39 | NAVARA TRANS ARGO SRL | Sat Ciolpani, Comuna Ciolpani | Ilfov | 738.5 mii | 3 |
| 40 | QHZ SERVERS HOSTING S.R.L. | Bucureşti Sectorul 6 | Bucureşti | 489.4 mii | 1 |
| 41 | ASMACS S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 290.6 mii | 2 |
| 42 | PRIMUS CORP S.R.L. | Municipiul Braşov | Braşov | 211.6 mii | 1 |
| 43 | RG ENERGY TECHNOLOGIES S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 193.4 mii | 0 |
| 44 | ZENITH RESOURCES S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 189.8 mii | 2 |
| 45 | JULIAN BLACK GOLD COMPANY S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 176.2 mii | 1 |
| 46 | HASEL INDUSTRIAL SRL | Sat Valea Călugărească, Comuna Valea Călugărească | Prahova | 131.4 mii | 2 |
| 47 | ALPHA ENERGY OPERATIONS S.R.L. | Bucureşti Sectorul 2 | Bucureşti | 50.5 mii | 0 |
| 48 | PACIFIC ENERGY S.A. | Municipiul Zalău | Sălaj | 35.5 mii | 1 |
| 49 | KARPATHIAN ENERGY DEVELOPMENT AGENCY S.A. | Sat Cornu de Jos, Comuna Cornu | Prahova | 10.9 mii | 2 |
| 50 | LOTUS PETROL SRL | Bucureşti Sectorul 4 | Bucureşti | 0 | 2 |
| 51 | ROMGAZ BLACK SEA LIMITED NASSAU (BAHAMAS) SUCURSALA BUCURESTI | Bucureşti Sectorul 1 | Bucureşti | 0 | 15 |
| 52 | LUKOIL OVERSEAS ATASH B.V., AMSTERDAM, OLANDA SUCURSALA BUCURESTI | Bucureşti Sectorul 1 | Bucureşti | 0 | 10 |
| 53 | CENTRAL EUROPEAN DRILLING S.R.L. | Municipiul Ploieşti | Prahova | 0 | 1 |
