| 1 | SOCIETATEA NATIONALA DE GAZE NATURALE " ROMGAZ " SA | Municipiul Mediaş | Sibiu | 7.58 mld | 5.227 |
| 2 | SAIPEM S.P.A MILANO - SUCURSALA ARICESTII RAHTIVANI | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 2.11 mld | 1 |
| 3 | SAIPEM ROMANIA S.R.L. | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 1.47 mld | 351 |
| 4 | SIEMENS ENERGY S.R.L. | Bucureşti Sectorul 5 | Bucureşti | 1.34 mld | 1.779 |
| 5 | OMV PETROM ENERGY SOLUTIONS S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 619.6 mil | 2.813 |
| 6 | SNGN "ROMGAZ" SA-FILIALA DE ÎNMAGAZINARE GAZE NATURALE DEPOGAZ PLOIEŞTI SRL | Municipiul Ploieşti | Prahova | 593.2 mil | 494 |
| 7 | WEATHERFORD ATLAS GIP SA | Municipiul Ploieşti | Prahova | 229.8 mil | 258 |
| 8 | NEWPARK DRILLING FLUIDS EASTERN EUROPE SRL | Bucureşti Sectorul 1 | Bucureşti | 226.8 mil | 103 |
| 9 | ATLAS COPCO ROMANIA SRL | Bucureşti Sectorul 1 | Bucureşti | 193.8 mil | 120 |
| 10 | PROSPECTIUNI SA | Bucureşti Sectorul 1 | Bucureşti | 158.3 mil | 379 |
| 11 | KRAFTANLAGEN ROMANIA SRL | Municipiul Ploieşti | Prahova | 152.5 mil | 211 |
| 12 | SCHLUMBERGER ROMANIA S.R.L. | Bucureşti Sectorul 6 | Bucureşti | 136.3 mil | 109 |
| 13 | INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE TURBOMOTOARE - COMOTI | Bucureşti Sectorul 6 | Bucureşti | 124.7 mil | 388 |
| 14 | DOF DENMARK A/S KONGENS LYNGBY - SUCURSALA BUCURESTI | Bucureşti Sectorul 5 | Bucureşti | 116.0 mil | 0 |
| 15 | ARGENTA S.R.L. | Loc. Năvodari, Oraş Năvodari | Constanţa | 95.0 mil | 202 |
| 16 | GAZPET INSTAL SRL | Municipiul Ploieşti | Prahova | 92.4 mil | 106 |
| 17 | MEGACONSTRUCT SA | Bucureşti Sectorul 3 | Bucureşti | 70.3 mil | 97 |
| 18 | ROMPETROL WELL SERVICES SA | Municipiul Ploieşti | Prahova | 63.2 mil | 134 |
| 19 | DEPOMURES SA | Municipiul Târgu Mureş | Mureş | 61.6 mil | 25 |
| 20 | NATIONAL OILWELL VARCO ROMANIA S.R.L. | Sat Negoieşti, Comuna Brazi | Prahova | 60.2 mil | 40 |
| 21 | FALCK FIRE SERVICES SRL | Bucureşti Sectorul 1 | Bucureşti | 55.0 mil | 344 |
| 22 | ARMAX GAZ SA | Municipiul Mediaş | Sibiu | 52.1 mil | 205 |
| 23 | MECANPETROL SA | Loc. Găeşti, Oraş Găeşti | Dâmboviţa | 51.8 mil | 170 |
| 24 | GEOSTUD SRL | Bucureşti Sectorul 1 | Bucureşti | 49.6 mil | 159 |
| 25 | ECOMED EASTERN EUROPE SRL | Bucureşti Sectorul 3 | Bucureşti | 46.6 mil | 22 |
| 26 | CHEMFOR BALKAN S.R.L. | Municipiul Ploieşti | Prahova | 45.8 mil | 34 |
| 27 | OCEANEERING INTERNATIONAL SERVICES LIMITED LONDRA SUCURSALA BUCURESTI | Bucureşti Sectorul 1 | Bucureşti | 45.1 mil | 0 |
| 28 | ODFJELL WELL SERVICES SRL | Sat Ariceştii Rahtivani, Comuna Ariceştii Rahtivani | Prahova | 43.8 mil | 52 |
| 29 | DIETSMANN S.R.L. | Oraş Voluntari | Ilfov | 39.7 mil | 145 |
| 30 | YÜKSEL PROJE ANONIM SIRKETI ANKARA - SUCURSALA BUCURESTI | Bucureşti Sectorul 1 | Bucureşti | 39.2 mil | 16 |
| 31 | IPIP SA | Municipiul Ploieşti | Prahova | 36.7 mil | 130 |
| 32 | ELEMENTAL ENERGIES S.R.L. | Bucureşti Sectorul 2 | Bucureşti | 32.8 mil | 5 |
| 33 | ANVERGO SRL | Municipiul Târgu Mureş | Mureş | 32.1 mil | 59 |
| 34 | BOURBON TECH SOLUTIONS S.R.L. | Bucureşti Sectorul 2 | Bucureşti | 31.3 mil | 35 |
| 35 | EDIGO TRANS SRL | Loc. Boldeşti-Scăeni, Oraş Boldeşti-Scăeni | Prahova | 30.2 mil | 59 |
| 36 | LLOYD'S REGISTER (ROMANIA) S.R.L. | Municipiul Constanţa | Constanţa | 30.0 mil | 14 |
| 37 | SONOVISION ROMANIA SRL | Municipiul Iaşi | Iaşi | 29.9 mil | 61 |
| 38 | INDEPENDENT OIL TOOLS SRL | Bucureşti Sectorul 1 | Bucureşti | 28.9 mil | 57 |
| 39 | NA SOLID PETROSERVE LTD CANADA CALGARY - SUCURSALA ROMANIA | Municipiul Ploieşti | Prahova | 28.5 mil | 38 |
| 40 | M I PETROGAS SERVICES ROMANIA SRL | Loc. Otopeni, Oraş Otopeni | Ilfov | 27.3 mil | 15 |
| 41 | WTS ENERGY GLOBAL SERVICES S.R.L. | Bucureşti Sectorul 1 | Bucureşti | 19.0 mil | 49 |
| 42 | H2OIL WELL SERVICES SRL | Municipiul Baia Mare | Maramureş | 19.0 mil | 1 |
| 43 | VALDRIX - S.A. | Bucureşti Sectorul 2 | Bucureşti | 18.1 mil | 12 |
| 44 | ERM ENVIRONMENTAL RESOURCES MANAGEMENT SRL | Bucureşti Sectorul 1 | Bucureşti | 17.4 mil | 22 |
| 45 | KATO GROUP SRL | Sat Ploieştiori, Comuna Blejoi | Prahova | 17.0 mil | 51 |
| 46 | NOV GERMANY GMBH CELLE GERMANIA SUCURSALA TÂRGOVIŞTE | Municipiul Târgovişte | Dâmboviţa | 16.9 mil | 43 |
| 47 | INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU INGINERIE ELECTRICA ICPE - CA BUCURESTI | Bucureşti Sectorul 3 | Bucureşti | 16.1 mil | 110 |
| 48 | ROHRER DEPOTS MANAGEMENT S.R.L. | Municipiul Constanţa | Constanţa | 15.6 mil | 95 |
| 49 | ECO GEODRUM SRL | Bucureşti Sectorul 1 | Bucureşti | 15.3 mil | 48 |
| 50 | PREMIER SLICKLINE S.A. | Municipiul Câmpina | Prahova | 15.1 mil | 38 |
| 51 | EVDANCO ARTIFICIAL LIFT SOLUTIONS S.R.L. | Municipiul Târgovişte | Dâmboviţa | 13.2 mil | 4 |
| 52 | EVDANCO OILFIELD SERVICES S.R.L. | Municipiul Târgovişte | Dâmboviţa | 12.6 mil | 30 |
| 53 | PEX SRL | Municipiul Ploieşti | Prahova | 12.1 mil | 43 |
| 54 | OIL DYNAMICS SERVICES S.R.L. | Bucureşti Sectorul 2 | Bucureşti | 11.9 mil | 13 |
| 55 | PRIMEX MURES SRL | Municipiul Târgu Mureş | Mureş | 11.7 mil | 26 |
| 56 | ISOTECH SRL | Municipiul Mediaş | Sibiu | 11.4 mil | 17 |
| 57 | PREPITECH SRL | Municipiul Sibiu | Sibiu | 11.0 mil | 25 |
| 58 | COMES INDUSTRY S.R.L. | Municipiul Piatra Neamţ | Neamţ | 11.0 mil | 27 |
| 59 | E.S. ONE S.R.L. | Municipiul Târgu Jiu | Gorj | 10.4 mil | 4 |
| 60 | DEVELTOR SRL | Municipiul Târgu Mureş | Mureş | 10.3 mil | 20 |
| 61 | RUXO SERVICE CONSTRUCT SRL | Sat Păuleşti, Comuna Păuleşti | Prahova | 9.7 mil | 20 |
| 62 | TRANSMARIN SRL | Sat Strejnicu, Comuna Târgşoru Vechi | Prahova | 9.5 mil | 15 |
| 63 | ARMOS EXIM SRL | Municipiul Târgu Mureş | Mureş | 8.8 mil | 19 |
| 64 | S.M.A.P.E.SRL ITALIA SUCURSALA BUCURESTI | Bucureşti Sectorul 5 | Bucureşti | 8.0 mil | 20 |
| 65 | ALCATO GROUP SRL | Municipiul Buzău | Buzău | 7.3 mil | 12 |
| 66 | ROUTE 66 SPEDITION SRL | Municipiul Constanţa | Constanţa | 6.9 mil | 7 |
| 67 | EUROHALE ANTREPRENOR SRL | Bucureşti Sectorul 3 | Bucureşti | 6.6 mil | 20 |
| 68 | OPTIMATIC SOLUTIONS SRL | Municipiul Ploieşti | Prahova | 6.4 mil | 18 |
| 69 | IAT ENGINEERING & DESIGN SRL | Municipiul Ploieşti | Prahova | 6.2 mil | 9 |
| 70 | SEA PROTECT GROUP SRL | Municipiul Constanţa | Constanţa | 6.2 mil | 31 |
| 71 | METALUX SRL | Municipiul Piteşti | Argeş | 6.1 mil | 31 |
| 72 | OGMS GROUP S.R.L. | Loc. Băicoi, Oraş Băicoi | Prahova | 5.6 mil | 2 |
| 73 | GLOBAL TECH XPERT SRL | Bucureşti Sectorul 6 | Bucureşti | 4.9 mil | 6 |
| 74 | SERVICII SI OPERATIUNI SPECIALE LA SONDE S.R.L. | Municipiul Mediaş | Sibiu | 4.8 mil | 7 |
| 75 | ARTIMET INDUSTRY SRL | Municipiul Moineşti | Bacău | 4.6 mil | 17 |
| 76 | FEMARIS SRL | Sat Cihei, Comuna Sânmartin | Bihor | 3.4 mil | 5 |
| 77 | BRUNEL ENERGY ROMANIA SRL | Bucureşti Sectorul 1 | Bucureşti | 3.4 mil | 2 |
| 78 | INSTITUTUL NAŢIONAL DE CERCETARE-DEZVOLTARE PENTRU INGINERIE ELECTRICĂ ICPE - CA BUCUREŞTI SUBUNITATEA ICEMENERG | Bucureşti Sectorul 3 | Bucureşti | 3.4 mil | 30 |
| 79 | UPETROM 1 MAI MANUFACTURING SRL | Oraş Voluntari | Ilfov | 3.2 mil | 33 |
| 80 | ALLIED GREEN ENERGY S.R.L. | Bucureşti Sectorul 3 | Bucureşti | 3.0 mil | 9 |
| 81 | PREMIER WELL SERVICES S.R.L. | Municipiul Ploieşti | Prahova | 2.9 mil | 3 |
| 82 | HIDROGAZ CONSTRUCT AG SRL | Municipiul Piteşti | Argeş | 2.8 mil | 9 |
| 83 | ROAD CONSTRUCT INDUSTRY SRL | Sat Fundeni, Comuna Dobroeşti | Ilfov | 2.4 mil | 7 |
| 84 | AS GAZ SERVICII COMPLETE S.R.L. | Municipiul Moineşti | Bacău | 2.3 mil | 18 |
| 85 | SERVICII SI REPARATII ECHIPAMENTE S.R.L. | Sat Păuleşti, Comuna Păuleşti | Prahova | 2.2 mil | 0 |
| 86 | DESPA SRL | Sat Colanu, Comuna Ulmi | Dâmboviţa | 2.0 mil | 10 |
| 87 | PICOIL INFO CONSULT SRL | Municipiul Câmpina | Prahova | 2.0 mil | 13 |
| 88 | ENVIROLAND S.R.L. | Bucureşti Sectorul 5 | Bucureşti | 1.8 mil | 3 |
| 89 | TECHNICAL OPERATIONS WORKS & SERVICES S.R.L. | Loc. Năvodari, Oraş Năvodari | Constanţa | 1.8 mil | 1 |
| 90 | OILFIELD EXPLORATION BUSINESS SOLUTIONS S.A. | Bucureşti Sectorul 1 | Bucureşti | 1.7 mil | 5 |
| 91 | CONSPETROL LAND SRL | Sat Berca, Comuna Berca | Buzău | 1.7 mil | 2 |
| 92 | PITSTOP RENTALS S.R.L. | Municipiul Turda | Cluj | 1.6 mil | 2 |
| 93 | DISTRIGAZ ŞIMIAN S.R.L. | Sat Şimian, Comuna Şimian | Mehedinţi | 1.4 mil | 10 |
| 94 | GAN GAZ WELDING S.R.L. | Sat Vârsolţ, Comuna Vârşolţ | Sălaj | 1.4 mil | 4 |
| 95 | LUXRA ONE CONCEPT S.R.L. | Bucureşti Sectorul 4 | Bucureşti | 1.2 mil | 1 |
| 96 | ENERGOPETROL COM SA | Municipiul Câmpina | Prahova | 1.2 mil | 9 |
| 97 | ALVIBA S.R.L. | Sat Ostratu, Comuna Corbeanca | Ilfov | 1.2 mil | 1 |
| 98 | MICHAEL DEVELOPMENT S.R.L. | Municipiul Ploieşti | Prahova | 1.2 mil | 1 |
| 99 | DANAMAR INOVATION SRL | Municipiul Ploieşti | Prahova | 1.2 mil | 11 |
| 100 | PETROEST SRL | Municipiul Moineşti | Bacău | 1.1 mil | 11 |
