| 1 | OMV PETROM ENERGY SOLUTIONS S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 2,813 |
| 2 | PETROFAC SOLUTIONS & FACILITIES SUPPORT SRL | Municipiul Ploieşti | Prahova | 524 |
| 3 | SNGN "ROMGAZ" SA-FILIALA DE ÎNMAGAZINARE GAZE NATURALE DEPOGAZ PLOIEŞTI SRL | Municipiul Ploieşti | Prahova | 494 |
| 4 | FORAJ SONDE SA | Loc. Videle, Oraş Videle | Teleorman | 351 |
| 5 | ROHRER OIL & GAS SERVICES S.R.L. | Sat Tătărani, Comuna Bărcăneşti | Prahova | 327 |
| 6 | FORAJ SONDE SA | Municipiul Craiova | Dolj | 277 |
| 7 | EXPERT PETROLEUM SRL | Bucureşti Sectorul 1 | Bucureşti | 270 |
| 8 | DIETSMANN S.R.L. | Oraş Voluntari | Ilfov | 145 |
| 9 | ROMPETROL WELL SERVICES SA | Municipiul Ploieşti | Prahova | 134 |
| 10 | COMREP SA | Municipiul Ploieşti | Prahova | 114 |
| 11 | SCHLUMBERGER ROMANIA S.R.L. | Bucureşti Sectorul 6 | Bucureşti | 109 |
| 12 | NEWPARK DRILLING FLUIDS EASTERN EUROPE SRL | Bucureşti Sectorul 1 | Bucureşti | 103 |
| 13 | ENDURANCE LIFT SOLUTIONS INTERNATIONAL S.R.L. | Sat Negoieşti, Comuna Brazi | Prahova | 98 |
| 14 | ROHRER DEPOTS MANAGEMENT S.R.L. | Municipiul Constanţa | Constanţa | 95 |
| 15 | TACROM SERVICES SRL | Municipiul Ploieşti | Prahova | 67 |
| 16 | ANVERGO SRL | Municipiul Târgu Mureş | Mureş | 59 |
| 17 | ODFJELL WELL SERVICES SRL | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 52 |
| 18 | NATIONAL OILWELL VARCO ROMANIA S.R.L. | Sat Negoieşti, Comuna Brazi | Prahova | 40 |
| 19 | NA SOLID PETROSERVE LTD CANADA CALGARY - SUCURSALA ROMANIA | Municipiul Ploieşti | Prahova | 38 |
| 20 | PREMIER SLICKLINE S.A. | Municipiul Câmpina | Prahova | 38 |
| 21 | CHEMFOR BALKAN S.R.L. | Municipiul Ploieşti | Prahova | 34 |
| 22 | DEPOMURES SA | Municipiul Târgu Mureş | Mureş | 25 |
| 23 | BOLT POWER ROMANIA SRL | Bucureşti Sectorul 1 | Bucureşti | 23 |
| 24 | DEVELTOR SRL | Municipiul Târgu Mureş | Mureş | 20 |
| 25 | S.M.A.P.E.SRL ITALIA SUCURSALA BUCURESTI | Bucureşti Sectorul 5 | Bucureşti | 20 |
| 26 | ARTIMET INDUSTRY SRL | Municipiul Moineşti | Bacău | 17 |
| 27 | M I PETROGAS SERVICES ROMANIA SRL | Loc. Otopeni, Oraş Otopeni | Ilfov | 15 |
| 28 | OIL DYNAMICS SERVICES S.R.L. | Bucureşti Sectorul 2 | Bucureşti | 13 |
| 29 | DAFORA SA | Municipiul Mediaş | Sibiu | 11 |
| 30 | DIETSCON O&M S.R.L. | Oraş Voluntari | Ilfov | 11 |
| 31 | FORAJ SONDE SA | Sat Ernei, Comuna Ernei | Mureş | 8 |
| 32 | ROCKWELL SERVICES S.R.L. | Sat Blejoi, Comuna Blejoi | Prahova | 8 |
| 33 | SERVICII SI OPERATIUNI SPECIALE LA SONDE S.R.L. | Municipiul Mediaş | Sibiu | 7 |
| 34 | XCD SRL | Municipiul Târgu Mureş | Mureş | 7 |
| 35 | PETROCONSTRUCT PITESTI SA | Sat Valea Mare-Podgoria, Oraş Ştefăneşti | Argeş | 6 |
| 36 | PSV COMPANY SA | Bucureşti Sectorul 1 | Bucureşti | 6 |
| 37 | WEST GAL TOUR SRL | Municipiul Piatra Neamţ | Neamţ | 6 |
| 38 | OILFIELD EXPLORATION BUSINESS SOLUTIONS S.A. | Bucureşti Sectorul 1 | Bucureşti | 5 |
| 39 | PANFORA OIL & GAS SRL | Municipiul Cluj-Napoca | Cluj | 4 |
| 40 | VALCHIR CONSTRUCT SRL | Municipiul Moreni | Dâmboviţa | 3 |
| 41 | ECOWELL SOLUTIONS SRL | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 3 |
| 42 | PREMIER WELL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 3 |
| 43 | LOTUS PETROL SRL | Bucureşti Sectorul 4 | Bucureşti | 2 |
| 44 | TUBEX SRL | Comuna Daneş | Mureş | 2 |
| 45 | SOLID PETROSERVE SRL | Municipiul Ploieşti | Prahova | 2 |
| 46 | DFG TECHNICAL DRILLING SERVICES SRL | Sat Bobolia, Comuna Poiana Câmpina | Prahova | 2 |
| 47 | REGIONAL ECO RECYCLING SRL | Sat Berca, Comuna Berca | Buzău | 2 |
| 48 | HEFAISTOS GLOBAL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 2 |
| 49 | LEYA O&G S.R.L. | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 2 |
| 50 | YOLO RDU S.R.L. | Municipiul Ploieşti | Prahova | 2 |
| 51 | QUICK SOLUTIONS GLOBAL S.R.L. | Municipiul Ploieşti | Prahova | 2 |
| 52 | CONTROL SOLID SERV S.R.L. | Municipiul Câmpina | Prahova | 2 |
| 53 | RIG SOLUTIONS S.R.L. | Municipiul Ploieşti | Prahova | 2 |
| 54 | PEROM PROD SRL | Municipiul Marghita | Bihor | 1 |
| 55 | ANGECRIS PETROPROD SRL | Municipiul Moreni | Dâmboviţa | 1 |
| 56 | AUTOTRANS GEDA SRL | Municipiul Piatra Neamţ | Neamţ | 1 |
| 57 | CARPATOIL SERVICES SRL | Sat Blejoi, Comuna Blejoi | Prahova | 1 |
| 58 | VIKING OILFIELD SERVICES SRL | Municipiul Ploieşti | Prahova | 1 |
| 59 | DRILLING CO BUZĂU SRL | Municipiul Buzău | Buzău | 1 |
| 60 | DRILLING & CONSULTING EXPERT SRL | Loc. Târgu Neamţ, Oraş Târgu Neamţ | Neamţ | 1 |
| 61 | DEA & EMY BUSINESS SRL | Municipiul Moineşti | Bacău | 1 |
| 62 | H2OIL WELL SERVICES SRL | Municipiul Baia Mare | Maramureş | 1 |
| 63 | C&MM IONA OILFIELD SERVICES SRL | Loc. Băicoi, Oraş Băicoi | Prahova | 1 |
| 64 | CENTRAL EUROPEAN DRILLING S.R.L. | Municipiul Ploieşti | Prahova | 1 |
| 65 | NEGREA NICOLAE SERVICES S.R.L. | Sat Gorneşti, Comuna Gorneşti | Mureş | 1 |
| 66 | PMD EXPLORATION S.R.L. | Sat Păuleşti, Comuna Păuleşti | Prahova | 1 |
| 67 | GEO LINE SOLUTION S.R.L. | Bucureşti Sectorul 4 | Bucureşti | 1 |
| 68 | WIDMUD SERVICES S.R.L. | Municipiul Blaj | Alba | 1 |
| 69 | ROSTIM SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 1 |
| 70 | AMIN DRILFLUID S.R.L. | Sat Vărbilău, Comuna Vărbilău | Prahova | 1 |
| 71 | SAIPEM S.P.A MILANO - SUCURSALA ARICESTII RAHTIVANI | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 1 |
| 72 | PETRO GAS ENGINEERING S.R.L. | Sat Păuleştii Noi, Comuna Păuleşti | Prahova | 1 |
| 73 | PBG OILFIELD MANAGEMENT S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 1 |
| 74 | CARPAT ENGINEERING S.R.L. | Sat Păuleşti, Comuna Păuleşti | Prahova | 1 |
| 75 | PHYTIA OIL & GAS S.R.L. | Loc. Băicoi, Oraş Băicoi | Prahova | 1 |
| 76 | CB FLUIDS SPECIALIST S.R.L. | Municipiul Slobozia | Ialomiţa | 1 |
| 77 | SARSICOM SOLUTIONS S.R.L. | Loc. Urlaţi, Oraş Urlaţi | Prahova | 1 |
| 78 | JULIAN BLACK GOLD COMPANY S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 1 |
| 79 | ENGINEERING SERVICES &MANAGEMENT S.R.L. | Sat Găgeni, Comuna Păuleşti | Prahova | 1 |
| 80 | DUCON CONSTRUCT S.R.L. | Bucureşti Sectorul 5 | Bucureşti | 1 |
| 81 | RYSCORP S.R.L. | Municipiul Ploieşti | Prahova | 1 |
| 82 | L.G DRILLING S.R.L. | Sat Vişineşti, Comuna Vişineşti | Dâmboviţa | 1 |
| 83 | FLORINTAZ S.R.L. | Sat Ţânţăreni, Comuna Blejoi | Prahova | 1 |
| 84 | MATVAS CONSULT S.R.L. | Municipiul Iaşi | Iaşi | 1 |
| 85 | BUCUR OIL SERVICES S.R.L. | Sat Băneşti, Comuna Băneşti | Prahova | 1 |
| 86 | SOLIDS EXPERT S.R.L. | Municipiul Ploieşti | Prahova | 1 |
| 87 | ALDAM SERVICES SOLUTIONS S.R.L. | Municipiul Târgovişte | Dâmboviţa | 1 |
| 88 | FRAC STIMULATION SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 1 |
| 89 | JUST DRILLING S.R.L. | Loc. Târgu Cărbuneşti, Oraş Târgu Cărbuneşti | Gorj | 1 |
| 90 | IMMC SMART ENERGY SOLUTIONS S.R.L. | Municipiul Ploieşti | Prahova | 1 |
| 91 | MOL RBS S.R.L. | Municipiul Cluj-Napoca | Cluj | 1 |
| 92 | TRG DRILLING FLUIDS SERVICES S.R.L. | Municipiul Râmnicu Sărat | Buzău | 1 |
| 93 | APC SUPPORT SERVICES S.R.L. | Municipiul Buzău | Buzău | 1 |
| 94 | L. P. C. DRILLING S.R.L. | Sat Plopu, Comuna Hurezani | Gorj | 1 |
| 95 | DANIEL SERVICY S.R.L. | Sat Buzota, Comuna Apostolache | Prahova | 1 |
| 96 | 2WIN GLOBAL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 1 |
| 97 | INDUS CART S.R.L. | Municipiul Târgu Jiu | Gorj | 1 |
| 98 | ANDREEA EXPERT AGENCY S.R.L. | Bucureşti Sectorul 4 | Bucureşti | 1 |
| 99 | MUDILI S.R.L. | Sat Ţânţăreni, Comuna Blejoi | Prahova | 1 |
| 100 | DRILL CONTACT SRL | Municipiul Târgovişte | Dâmboviţa | 0 |
