| 1 | SAIPEM S.P.A MILANO - SUCURSALA ARICESTII RAHTIVANI | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 2,1 mld. | 1 |
| 2 | OMV PETROM ENERGY SOLUTIONS S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 619,6 mil. | 2.813 |
| 3 | SNGN "ROMGAZ" SA-FILIALA DE ÎNMAGAZINARE GAZE NATURALE DEPOGAZ PLOIEŞTI SRL | Municipiul Ploieşti | Prahova | 593,2 mil. | 494 |
| 4 | FORAJ SONDE SA | Loc. Videle, Oraş Videle | Teleorman | 251,7 mil. | 351 |
| 5 | PETROFAC SOLUTIONS & FACILITIES SUPPORT SRL | Municipiul Ploieşti | Prahova | 239,0 mil. | 524 |
| 6 | NEWPARK DRILLING FLUIDS EASTERN EUROPE SRL | Bucureşti Sectorul 1 | Bucureşti | 226,8 mil. | 103 |
| 7 | FORAJ SONDE SA | Municipiul Craiova | Dolj | 166,0 mil. | 277 |
| 8 | SCHLUMBERGER ROMANIA S.R.L. | Bucureşti Sectorul 6 | Bucureşti | 136,3 mil. | 109 |
| 9 | EXPERT PETROLEUM SRL | Bucureşti Sectorul 1 | Bucureşti | 91,5 mil. | 270 |
| 10 | ROHRER OIL & GAS SERVICES S.R.L. | Sat Tătărani, Comuna Bărcăneşti | Prahova | 82,3 mil. | 327 |
| 11 | TACROM SERVICES SRL | Municipiul Ploieşti | Prahova | 78,7 mil. | 67 |
| 12 | CHRISTOF MB WELL S.R.L. | Sat Brazii de Sus, Comuna Brazi | Prahova | 74,2 mil. | — |
| 13 | ROMPETROL WELL SERVICES SA | Municipiul Ploieşti | Prahova | 63,2 mil. | 134 |
| 14 | DEPOMURES SA | Municipiul Târgu Mureş | Mureş | 61,6 mil. | 25 |
| 15 | ENDURANCE LIFT SOLUTIONS INTERNATIONAL S.R.L. | Sat Negoieşti, Comuna Brazi | Prahova | 61,2 mil. | 98 |
| 16 | NATIONAL OILWELL VARCO ROMANIA S.R.L. | Sat Negoieşti, Comuna Brazi | Prahova | 60,2 mil. | 40 |
| 17 | CHEMFOR BALKAN S.R.L. | Municipiul Ploieşti | Prahova | 45,8 mil. | 34 |
| 18 | OCEANEERING INTERNATIONAL SERVICES LIMITED LONDRA SUCURSALA BUCURESTI | Bucureşti Sectorul 1 | Bucureşti | 45,1 mil. | 0 |
| 19 | ODFJELL WELL SERVICES SRL | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 43,8 mil. | 52 |
| 20 | DIETSMANN S.R.L. | Oraş Voluntari | Ilfov | 39,7 mil. | 145 |
| 21 | ANVERGO SRL | Municipiul Târgu Mureş | Mureş | 32,1 mil. | 59 |
| 22 | NA SOLID PETROSERVE LTD CANADA CALGARY - SUCURSALA ROMANIA | Municipiul Ploieşti | Prahova | 28,5 mil. | 38 |
| 23 | M I PETROGAS SERVICES ROMANIA SRL | Loc. Otopeni, Oraş Otopeni | Ilfov | 27,3 mil. | 15 |
| 24 | COMREP SA | Municipiul Ploieşti | Prahova | 23,9 mil. | 114 |
| 25 | H2OIL WELL SERVICES SRL | Municipiul Baia Mare | Maramureş | 19,0 mil. | 1 |
| 26 | ROHRER DEPOTS MANAGEMENT S.R.L. | Municipiul Constanţa | Constanţa | 15,6 mil. | 95 |
| 27 | PREMIER SLICKLINE S.A. | Municipiul Câmpina | Prahova | 15,1 mil. | 38 |
| 28 | OIL DYNAMICS SERVICES S.R.L. | Bucureşti Sectorul 2 | Bucureşti | 11,9 mil. | 13 |
| 29 | DEVELTOR SRL | Municipiul Târgu Mureş | Mureş | 10,3 mil. | 20 |
| 30 | S.M.A.P.E.SRL ITALIA SUCURSALA BUCURESTI | Bucureşti Sectorul 5 | Bucureşti | 8,0 mil. | 20 |
| 31 | TACROM DRILLING SRL | Municipiul Ploieşti | Prahova | 7,7 mil. | — |
| 32 | BOLT POWER ROMANIA SRL | Bucureşti Sectorul 1 | Bucureşti | 7,4 mil. | 23 |
| 33 | ECOWELL SOLUTIONS SRL | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 6,7 mil. | 3 |
| 34 | SERVICII SI OPERATIUNI SPECIALE LA SONDE S.R.L. | Municipiul Mediaş | Sibiu | 4,8 mil. | 7 |
| 35 | ARTIMET INDUSTRY SRL | Municipiul Moineşti | Bacău | 4,6 mil. | 17 |
| 36 | PREMIER WELL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 2,9 mil. | 3 |
| 37 | SERVICII SI REPARATII ECHIPAMENTE S.R.L. | Sat Păuleşti, Comuna Păuleşti | Prahova | 2,2 mil. | 0 |
| 38 | ROCKWELL SERVICES S.R.L. | Sat Blejoi, Comuna Blejoi | Prahova | 1,8 mil. | 8 |
| 39 | OILFIELD EXPLORATION BUSINESS SOLUTIONS S.A. | Bucureşti Sectorul 1 | Bucureşti | 1,7 mil. | 5 |
| 40 | DFG TECHNICAL DRILLING SERVICES SRL | Sat Bobolia, Comuna Poiana Câmpina | Prahova | 1,1 mil. | 2 |
| 41 | XCD SRL | Municipiul Târgu Mureş | Mureş | 979 mii | 7 |
| 42 | SOLID PETROSERVE SRL | Municipiul Ploieşti | Prahova | 814 mii | 2 |
| 43 | WEST GAL TOUR SRL | Municipiul Piatra Neamţ | Neamţ | 740 mii | 6 |
| 44 | TUBEX SRL | Comuna Daneş | Mureş | 732 mii | 2 |
| 45 | PMD EXPLORATION S.R.L. | Sat Păuleşti, Comuna Păuleşti | Prahova | 623 mii | 1 |
| 46 | PBG OILFIELD MANAGEMENT S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 615 mii | 1 |
| 47 | CB FLUIDS SPECIALIST S.R.L. | Municipiul Slobozia | Ialomiţa | 523 mii | 1 |
| 48 | JUST DRILLING S.R.L. | Loc. Târgu Cărbuneşti, Oraş Târgu Cărbuneşti | Gorj | 508 mii | 1 |
| 49 | VALCHIR CONSTRUCT SRL | Municipiul Moreni | Dâmboviţa | 503 mii | 3 |
| 50 | ROSTIM SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 488 mii | 1 |
| 51 | DRILLING & CONSULTING EXPERT SRL | Loc. Târgu Neamţ, Oraş Târgu Neamţ | Neamţ | 475 mii | 1 |
| 52 | APC SUPPORT SERVICES S.R.L. | Municipiul Buzău | Buzău | 456 mii | 1 |
| 53 | GEO LINE SOLUTION S.R.L. | Bucureşti Sectorul 4 | Bucureşti | 442 mii | 1 |
| 54 | FRAC STIMULATION SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 412 mii | 1 |
| 55 | TRG DRILLING FLUIDS SERVICES S.R.L. | Municipiul Râmnicu Sărat | Buzău | 405 mii | 1 |
| 56 | IMMC SMART ENERGY SOLUTIONS S.R.L. | Municipiul Ploieşti | Prahova | 370 mii | 1 |
| 57 | NEGREA NICOLAE SERVICES S.R.L. | Sat Gorneşti, Comuna Gorneşti | Mureş | 369 mii | 1 |
| 58 | ALDAM SERVICES SOLUTIONS S.R.L. | Municipiul Târgovişte | Dâmboviţa | 366 mii | 1 |
| 59 | MARIANIS INSPECTION SERVICES S.R.L. | Sat Bucov, Comuna Bucov | Prahova | 319 mii | 0 |
| 60 | YOLO RDU S.R.L. | Municipiul Ploieşti | Prahova | 312 mii | 2 |
| 61 | LEYA O&G S.R.L. | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 303 mii | 2 |
| 62 | DANIEL SERVICY S.R.L. | Sat Buzota, Comuna Apostolache | Prahova | 302 mii | 1 |
| 63 | DRILLING RISKS SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 296 mii | 0 |
| 64 | PETRO GAS ENGINEERING S.R.L. | Sat Păuleştii Noi, Comuna Păuleşti | Prahova | 282 mii | 1 |
| 65 | BUCUR OIL SERVICES S.R.L. | Sat Băneşti, Comuna Băneşti | Prahova | 280 mii | 1 |
| 66 | AMIN DRILFLUID S.R.L. | Sat Vărbilău, Comuna Vărbilău | Prahova | 276 mii | 1 |
| 67 | MATVAS CONSULT S.R.L. | Municipiul Iaşi | Iaşi | 268 mii | 1 |
| 68 | L.G DRILLING S.R.L. | Sat Vişineşti, Comuna Vişineşti | Dâmboviţa | 266 mii | 1 |
| 69 | DF-PROFSERV S.R.L. | Sat Aroneanu, Comuna Aroneanu | Iaşi | 261 mii | 0 |
| 70 | L. P. C. DRILLING S.R.L. | Sat Plopu, Comuna Hurezani | Gorj | 251 mii | 1 |
| 71 | HEFAISTOS GLOBAL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 250 mii | 2 |
| 72 | PHYTIA OIL & GAS S.R.L. | Loc. Băicoi, Oraş Băicoi | Prahova | 246 mii | 1 |
| 73 | INDUS CART S.R.L. | Municipiul Târgu Jiu | Gorj | 237 mii | 1 |
| 74 | CONTROL SOLID SERV S.R.L. | Municipiul Câmpina | Prahova | 231 mii | 2 |
| 75 | ENGINEERING SERVICES &MANAGEMENT S.R.L. | Sat Găgeni, Comuna Păuleşti | Prahova | 207 mii | 1 |
| 76 | DIETSCON O&M S.R.L. | Oraş Voluntari | Ilfov | 207 mii | 11 |
| 77 | I.M.S.G. S.R.L. | Municipiul Ploieşti | Prahova | 202 mii | 0 |
| 78 | QUICK SOLUTIONS GLOBAL S.R.L. | Municipiul Ploieşti | Prahova | 199 mii | 2 |
| 79 | DUCON CONSTRUCT S.R.L. | Bucureşti Sectorul 5 | Bucureşti | 197 mii | 1 |
| 80 | JULIAN BLACK GOLD COMPANY S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 176 mii | 1 |
| 81 | SOLIDS EXPERT S.R.L. | Municipiul Ploieşti | Prahova | 172 mii | 1 |
| 82 | EP DIGITAL CONCEPT SRL | Bucureşti Sectorul 6 | Bucureşti | 167 mii | 0 |
| 83 | RIG SOLUTIONS S.R.L. | Municipiul Ploieşti | Prahova | 159 mii | 2 |
| 84 | 2WIN GLOBAL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 149 mii | 1 |
| 85 | WIDMUD SERVICES S.R.L. | Municipiul Blaj | Alba | 135 mii | 1 |
| 86 | ASANACHE CONSULT S.R.L. | Municipiul Târgovişte | Dâmboviţa | 124 mii | 0 |
| 87 | MUDILI S.R.L. | Sat Ţânţăreni, Comuna Blejoi | Prahova | 119 mii | 1 |
| 88 | CARPATOIL SERVICES SRL | Sat Blejoi, Comuna Blejoi | Prahova | 117 mii | 1 |
| 89 | MIHAIDAR-PETROL CONSULT S.R.L. | Municipiul Târgovişte | Dâmboviţa | 113 mii | 0 |
| 90 | GAMA INTERMED BEST DEAL S.R.L. | Municipiul Ploieşti | Prahova | 108 mii | 0 |
| 91 | CIOBIVAL EXPERT SRL | Loc. Băicoi, Oraş Băicoi | Prahova | 107 mii | 0 |
| 92 | ANGECRIS PETROPROD SRL | Municipiul Moreni | Dâmboviţa | 105 mii | 1 |
| 93 | PETROCONSTRUCT PITESTI SA | Sat Valea Mare-Podgoria, Oraş Ştefăneşti | Argeş | 97 mii | 6 |
| 94 | ROBMIR SOLUTION S.R.L. | Municipiul Arad | Arad | 91 mii | 0 |
| 95 | DEA & EMY BUSINESS SRL | Municipiul Moineşti | Bacău | 86 mii | 1 |
| 96 | PEROM PROD SRL | Municipiul Marghita | Bihor | 85 mii | 1 |
| 97 | ANDREEA EXPERT AGENCY S.R.L. | Bucureşti Sectorul 4 | Bucureşti | 79 mii | 1 |
| 98 | STARH WORKOVER SERVICES S.R.L. | Sat Bucov, Comuna Bucov | Prahova | 77 mii | 0 |
| 99 | SIMIROCKCONS S.R.L. | Municipiul Focşani | Vrancea | 48 mii | 0 |
| 100 | SARSICOM SOLUTIONS S.R.L. | Loc. Urlaţi, Oraş Urlaţi | Prahova | 42 mii | 1 |
