| 1 | SNGN "ROMGAZ" SA-FILIALA DE ÎNMAGAZINARE GAZE NATURALE DEPOGAZ PLOIEŞTI SRL | Municipiul Ploieşti | Prahova | 179,6 mil. | 494 |
| 2 | NEWPARK DRILLING FLUIDS EASTERN EUROPE SRL | Bucureşti Sectorul 1 | Bucureşti | 57,0 mil. | 103 |
| 3 | PETROFAC SOLUTIONS & FACILITIES SUPPORT SRL | Municipiul Ploieşti | Prahova | 51,3 mil. | 524 |
| 4 | SAIPEM S.P.A MILANO - SUCURSALA ARICESTII RAHTIVANI | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 28,4 mil. | 1 |
| 5 | OMV PETROM ENERGY SOLUTIONS S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 26,2 mil. | 2.813 |
| 6 | DEPOMURES SA | Municipiul Târgu Mureş | Mureş | 20,8 mil. | 25 |
| 7 | FORAJ SONDE SA | Municipiul Craiova | Dolj | 11,0 mil. | 277 |
| 8 | ENDURANCE LIFT SOLUTIONS INTERNATIONAL S.R.L. | Sat Negoieşti, Comuna Brazi | Prahova | 10,5 mil. | 98 |
| 9 | NA SOLID PETROSERVE LTD CANADA CALGARY - SUCURSALA ROMANIA | Municipiul Ploieşti | Prahova | 9,5 mil. | 38 |
| 10 | ANVERGO SRL | Municipiul Târgu Mureş | Mureş | 8,3 mil. | 59 |
| 11 | PSV COMPANY SA | Bucureşti Sectorul 1 | Bucureşti | 8,1 mil. | 6 |
| 12 | TACROM SERVICES SRL | Municipiul Ploieşti | Prahova | 7,4 mil. | 67 |
| 13 | OILFIELD EXPLORATION BUSINESS SOLUTIONS S.A. | Bucureşti Sectorul 1 | Bucureşti | 5,9 mil. | 5 |
| 14 | CHEMFOR BALKAN S.R.L. | Municipiul Ploieşti | Prahova | 5,0 mil. | 34 |
| 15 | ROMPETROL WELL SERVICES SA | Municipiul Ploieşti | Prahova | 3,9 mil. | 134 |
| 16 | PRODUCTION SOLUTIONS INTERNATIONAL ROMANIA S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 2,7 mil. | 0 |
| 17 | DEVELTOR SRL | Municipiul Târgu Mureş | Mureş | 2,7 mil. | 20 |
| 18 | SERVICII SI REPARATII ECHIPAMENTE S.R.L. | Sat Păuleşti, Comuna Păuleşti | Prahova | 1,8 mil. | 0 |
| 19 | TACROM DRILLING SRL | Municipiul Ploieşti | Prahova | 1,7 mil. | — |
| 20 | OIL DYNAMICS SERVICES S.R.L. | Bucureşti Sectorul 2 | Bucureşti | 1,6 mil. | 13 |
| 21 | SERVICII SI OPERATIUNI SPECIALE LA SONDE S.R.L. | Municipiul Mediaş | Sibiu | 1,6 mil. | 7 |
| 22 | DAFORA SA | Municipiul Mediaş | Sibiu | 1,4 mil. | 11 |
| 23 | ODFJELL WELL SERVICES SRL | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 1,4 mil. | 52 |
| 24 | PREMIER WELL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 1,3 mil. | 3 |
| 25 | ECOWELL SOLUTIONS SRL | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 1,3 mil. | 3 |
| 26 | OCEANEERING INTERNATIONAL SERVICES LIMITED LONDRA SUCURSALA BUCURESTI | Bucureşti Sectorul 1 | Bucureşti | 1,2 mil. | 0 |
| 27 | ARTIMET INDUSTRY SRL | Municipiul Moineşti | Bacău | 721 mii | 17 |
| 28 | DFG TECHNICAL DRILLING SERVICES SRL | Sat Bobolia, Comuna Poiana Câmpina | Prahova | 588 mii | 2 |
| 29 | PBG OILFIELD MANAGEMENT S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 390 mii | 1 |
| 30 | ROSTIM SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 365 mii | 1 |
| 31 | CB FLUIDS SPECIALIST S.R.L. | Municipiul Slobozia | Ialomiţa | 364 mii | 1 |
| 32 | EXPERT PETROLEUM SRL | Bucureşti Sectorul 1 | Bucureşti | 318 mii | 270 |
| 33 | APC SUPPORT SERVICES S.R.L. | Municipiul Buzău | Buzău | 292 mii | 1 |
| 34 | NEGREA NICOLAE SERVICES S.R.L. | Sat Gorneşti, Comuna Gorneşti | Mureş | 252 mii | 1 |
| 35 | BOLT POWER ROMANIA SRL | Bucureşti Sectorul 1 | Bucureşti | 198 mii | 23 |
| 36 | TRG DRILLING FLUIDS SERVICES S.R.L. | Municipiul Râmnicu Sărat | Buzău | 198 mii | 1 |
| 37 | ALDAM SERVICES SOLUTIONS S.R.L. | Municipiul Târgovişte | Dâmboviţa | 197 mii | 1 |
| 38 | FRAC STIMULATION SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 190 mii | 1 |
| 39 | PETRO GAS ENGINEERING S.R.L. | Sat Păuleştii Noi, Comuna Păuleşti | Prahova | 186 mii | 1 |
| 40 | TUBEX SRL | Comuna Daneş | Mureş | 184 mii | 2 |
| 41 | DRILLING RISKS SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 177 mii | 0 |
| 42 | BUCUR OIL SERVICES S.R.L. | Sat Băneşti, Comuna Băneşti | Prahova | 158 mii | 1 |
| 43 | PMD EXPLORATION S.R.L. | Sat Păuleşti, Comuna Păuleşti | Prahova | 152 mii | 1 |
| 44 | IMMC SMART ENERGY SOLUTIONS S.R.L. | Municipiul Ploieşti | Prahova | 152 mii | 1 |
| 45 | DF-PROFSERV S.R.L. | Sat Aroneanu, Comuna Aroneanu | Iaşi | 143 mii | 0 |
| 46 | PHYTIA OIL & GAS S.R.L. | Loc. Băicoi, Oraş Băicoi | Prahova | 143 mii | 1 |
| 47 | DANIEL SERVICY S.R.L. | Sat Buzota, Comuna Apostolache | Prahova | 142 mii | 1 |
| 48 | MATVAS CONSULT S.R.L. | Municipiul Iaşi | Iaşi | 139 mii | 1 |
| 49 | I.M.S.G. S.R.L. | Municipiul Ploieşti | Prahova | 135 mii | 0 |
| 50 | AMIN DRILFLUID S.R.L. | Sat Vărbilău, Comuna Vărbilău | Prahova | 119 mii | 1 |
| 51 | JUST DRILLING S.R.L. | Loc. Târgu Cărbuneşti, Oraş Târgu Cărbuneşti | Gorj | 116 mii | 1 |
| 52 | HEFAISTOS GLOBAL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 101 mii | 2 |
| 53 | L. P. C. DRILLING S.R.L. | Sat Plopu, Comuna Hurezani | Gorj | 100 mii | 1 |
| 54 | DRILLING & CONSULTING EXPERT SRL | Loc. Târgu Neamţ, Oraş Târgu Neamţ | Neamţ | 96 mii | 1 |
| 55 | LEYA O&G S.R.L. | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 95 mii | 2 |
| 56 | MUDILI S.R.L. | Sat Ţânţăreni, Comuna Blejoi | Prahova | 92 mii | 1 |
| 57 | JULIAN BLACK GOLD COMPANY S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 86 mii | 1 |
| 58 | GAMA INTERMED BEST DEAL S.R.L. | Municipiul Ploieşti | Prahova | 84 mii | 0 |
| 59 | MARIANIS INSPECTION SERVICES S.R.L. | Sat Bucov, Comuna Bucov | Prahova | 82 mii | 0 |
| 60 | YOLO RDU S.R.L. | Municipiul Ploieşti | Prahova | 80 mii | 2 |
| 61 | L.G DRILLING S.R.L. | Sat Vişineşti, Comuna Vişineşti | Dâmboviţa | 67 mii | 1 |
| 62 | ROCKWELL SERVICES S.R.L. | Sat Blejoi, Comuna Blejoi | Prahova | 66 mii | 8 |
| 63 | COMREP SA | Municipiul Ploieşti | Prahova | 64 mii | 114 |
| 64 | DUCON CONSTRUCT S.R.L. | Bucureşti Sectorul 5 | Bucureşti | 64 mii | 1 |
| 65 | GEO LINE SOLUTION S.R.L. | Bucureşti Sectorul 4 | Bucureşti | 62 mii | 1 |
| 66 | CONTROL SOLID SERV S.R.L. | Municipiul Câmpina | Prahova | 61 mii | 2 |
| 67 | INDUS CART S.R.L. | Municipiul Târgu Jiu | Gorj | 59 mii | 1 |
| 68 | CIOBIVAL EXPERT SRL | Loc. Băicoi, Oraş Băicoi | Prahova | 58 mii | 0 |
| 69 | ENGINEERING SERVICES &MANAGEMENT S.R.L. | Sat Găgeni, Comuna Păuleşti | Prahova | 50 mii | 1 |
| 70 | DEA & EMY BUSINESS SRL | Municipiul Moineşti | Bacău | 48 mii | 1 |
| 71 | 2WIN GLOBAL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 47 mii | 1 |
| 72 | ASANACHE CONSULT S.R.L. | Municipiul Târgovişte | Dâmboviţa | 45 mii | 0 |
| 73 | QUICK SOLUTIONS GLOBAL S.R.L. | Municipiul Ploieşti | Prahova | 45 mii | 2 |
| 74 | MIHAIDAR-PETROL CONSULT S.R.L. | Municipiul Târgovişte | Dâmboviţa | 42 mii | 0 |
| 75 | XCD SRL | Municipiul Târgu Mureş | Mureş | 38 mii | 7 |
| 76 | SIMIROCKCONS S.R.L. | Municipiul Focşani | Vrancea | 36 mii | 0 |
| 77 | SOLID PETROSERVE SRL | Municipiul Ploieşti | Prahova | 29 mii | 2 |
| 78 | NABORS DRILLING INTERNATIONAL PLOIEŞTI SRL | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 29 mii | — |
| 79 | ANGECRIS PETROPROD SRL | Municipiul Moreni | Dâmboviţa | 28 mii | 1 |
| 80 | EP DIGITAL CONCEPT SRL | Bucureşti Sectorul 6 | Bucureşti | 27 mii | 0 |
| 81 | RIG SOLUTIONS S.R.L. | Municipiul Ploieşti | Prahova | 26 mii | 2 |
| 82 | ANDREEA EXPERT AGENCY S.R.L. | Bucureşti Sectorul 4 | Bucureşti | 15 mii | 1 |
| 83 | SOLIDS EXPERT S.R.L. | Municipiul Ploieşti | Prahova | 14 mii | 1 |
| 84 | SUPER BUSINESS S.R.L. | Municipiul Câmpina | Prahova | 11 mii | 0 |
| 85 | ROWELL OIL & GAS SERVICES S.R.L. | Loc. Breaza de Sus, Oraş Breaza | Prahova | 9 mii | — |
| 86 | SARSICOM SOLUTIONS S.R.L. | Loc. Urlaţi, Oraş Urlaţi | Prahova | 5 mii | 1 |
| 87 | PRELAT PREST SRL | Loc. Târgu Ocna, Oraş Târgu Ocna | Bacău | 0 | 0 |
| 88 | IAMSAT PRODCONSTRUCT SA | Municipiul Piteşti | Argeş | 0 | 0 |
| 89 | HEO SPORT SRL | Municipiul Craiova | Dolj | 0 | 0 |
| 90 | SWISO FORAJ SRL | Comuna Floreşti | Prahova | 0 | 0 |
| 91 | WD - SERVICES. CO SRL | Sat Blejoi, Comuna Blejoi | Prahova | 0 | 0 |
| 92 | IAT GLOBAL SRL | Municipiul Ploieşti | Prahova | 0 | 0 |
| 93 | MB DRILLING ROMANIA SRL | Municipiul Călăraşi | Călăraşi | 0 | 0 |
| 94 | NORDRILL SRL | Municipiul Ploieşti | Prahova | 0 | 0 |
| 95 | DRILLING MD EXPERT SRL | Loc. Târgu Neamţ, Oraş Târgu Neamţ | Neamţ | 0 | 0 |
| 96 | MC NON DISTRUCTIVE EXAMINATION S.R.L. | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 0 | — |
| 97 | IOV IT-SERVIZI S.R.L. | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 0 | — |
| 98 | STANDARD DRILLING CONSULTING S.R.L. | Municipiul Ploieşti | Prahova | 0 | 0 |
| 99 | HOR YAZ OIL GAZ S.R.L. | Loc. Videle, Oraş Videle | Teleorman | 0 | 0 |
| 100 | MIRSONS BEST METALS S.R.L. | Municipiul Galaţi | Galaţi | -50 | — |
