| ADVANCED POWER SWITCHGEAR COMPANY LLC | 4117 | Oman |
| AGILITY LOGISTICS COMPANY (GLOBAL LOGISTICS OMAN LLC) | 5011B | Oman |
| AIV | S34 | United Arab Emirates |
| AL AFLAJ ENGINEERING & PROJECTS LLC | 5204C | Oman |
| AL MOURID FOR OIL SERVICES LLC | 5315 | Oman |
| AL NAFIE STEEL LLC | 5104 | United Arab Emirates |
| AL SUMRI TRADING & CONTRACTING ESTABLISHMENT | 2027 | Oman |
| ALFANAR ENGINEERING SERVICES | 4212 | Saudi Arabia |
| ALS ARABIA BIYAQ LLC | 5102A | Oman |
| AMBICA STEELS LIMITED | S19 | India |
| APERGY MIDDLE EAST LLC | 4103 | Oman |
| APPLIED PHYSICS SYSTEMS | 5314 | United States |
| ARA PETROLEUM LLC | 3305 | Oman |
| ARABIAN PIPES CO | 4209 | Saudi Arabia |
| ARCELORMITTAL TUBULAR PRODUCTS JUBAIL | 4002 | Saudi Arabia |
| ASIA BOLTS INDUSTRY (FZC) LLC | 3310 | Oman |
| ATMOS INTERNATIONAL | 2029 | United Kingdom |
| BAKER HUGHES | 2005 | United Arab Emirates |
| BINDER EDELSTAHL PRODUKTIONSGES. MBH | S37 | Germany |
| BLASTLINE LLC | 5425 | United Arab Emirates |
| BOLLINGHAUS STEEL GMBH | S10 | Germany |
| BP EXPLORATION (EPILSON) LTD | 3101 | Oman |
| BREDA ENERGIA S.P.A. | 2028 | Italy |
| BUSINESS GATEWAYS | 5105 | Oman |
| CALTROLS MIIDLE EAST | 2025 | Oman |
| CANADIAN SCOTTISH CO. LLC | 5103 | Oman |
| CARL STAHL LIFTING EQUIPMENT INDUSTRIES LLC | 5321 | United Arab Emirates |
| CASAGRANDE ELETTROCOSTRUZIONI S.P.A | 4208 | Italy |
| CC ENERGY DEVELOPMENT S.A.L (OMAN) | 5301 | Oman |
| COMPASS OIL SERVICES LLC | 3010 | Oman |
| COMPLETION OIL TOOLS PRIVATE LIMITED | 5204A | India |
| COMPOSITE PIPES INDUSTRY LLC | 4210 | Oman |
| COMPUTER MODELLING GROUP LTD | 3021 | Canada |
| CRIMSON PETROLEUM SERVICES LLC | 2501 | Oman |
| CROWNE PLAZA MUSCAT OMAN CONVENTION AND EXHIBITION CENTER | 3030 | Oman |
| CRYSTAL INTERNATIONAL TECHNOLOGY & TRADING LLC | 2110 | Oman |
| CTS MIDDLE EAST BAHRAIN WLL | 3103 | Bahrain |
| DALEEL PETROLEUM LLC | 5001 | Oman |
| DELTA CORPORATION | 4304 | Qatar |
| DIVINE TUBES PVT. LTD | S4 | India |
| DRUPPS AB | 5104B | Sweden |
| DSCAFF ENGINEERING SDN. BHD | 4113 | Malaysia |
| ECARYS GMBH | 5323 | Germany |
| ELIXIR ENGINEERING - PROCESS SAFETY I FIRE & GAS I ENGINEERING DESIGN & CONSULTACY | 5102B | Oman |
| ENERWHERE SUSTAINABLE ENERGY | 3031 | United Arab Emirates |
| ENI SPA | 2101 | Italy |
| EOR ALLIANCE | 2026 | France |
| EUGENIE.AI | 4118B | United States |
| FIELDAQ AS | 4006B | Norway |
| FIRST FILTER LLC | 3026 | Oman |
| FOS ENERGY LLC | 5201 | Oman |
| FUTURE OILFIELD SUPPLY AND SERVICES LLC | 2502 | Oman |
| G.M. INTERNATIONAL SRL | 4203 | Italy |
| GATES ENGINEERING & SERVICES LLC | 3020 | Oman |
| GERBER HOLDING GMBH | S30 | Germany |
| GLOBAL COMPUTER SERVICES | 2023B | Oman |
| GLOBAL INDUSTRIAL SERVICES LLC | 3012 | Oman |
| GOLDEN HARBOUR LLC | 5426 | United Arab Emirates |
| GULF ENERGY SAOC | 3102 | Oman |
| GULF PETRO SOLUTIONS LLC | 5202 | Oman |
| HALLIBURTON WORLD WIDE LIMITED | 3302 | Oman |
| HART BV | S40 | Netherlands |
| HEAVY EQUIPMENT MAINTENANCE & TRADING CO. LLC (HEMT) | 5302 | Oman |
| HEMA ENERGY | 3105 | Oman |
| HILTON METAL FORGING LTD | S9 | India |
| HORIZON CAPITAL DIAMOND TRADE | 4114 | Oman |
| HORMUZ ENERGY SERVICES | 4110 | Oman |
| HW-INOX GMBH | S11 | Germany |
| HY-LOK MIDDLE EAST | 5206 | United Arab Emirates |
| HYTORC | 5003 | Oman |
| IBD GROUP | 2010 | Oman |
| INFINITY OIL SERVICES | 5005 | Oman |
| INFLOWCONTROL | 3106 | Oman |
| INLAND TARP & LINER | 4213 | U.S.A. |
| INTERWELL | 5303 | Oman |
| ITECO OILFIELD SUPPLY ME FZCO | 5307 | United Arab Emirates |
| JIANGSU HONGCHENG MARINE TECHNOLOGY CO., LTD | S38 | China |
| JKL HARDWARE PRODUCTS CO LTD | S43 | China |
| JSC OZNA METERING SYSTEMS | 5208A | Russian Federation |
| KCI WORLD | S50 | Netherlands |
| KOSO GULF LLC | 3011 | Oman |
| KRYSTAL GLOBAL ENGINEERING LIMITED | S5 | India |
| LANGLEY ALLOYS | S42 | United Kingdom |
| LOTO SAFETY PRODUCTS DMCC | 3208 | United Arab Emirates |
| LST LINSTER STAINLESS TRADING GMBH | S7 | Germany |
| MAC PIPING MATERIALS SDN BHD | S41 | Malaysia |
| MAJEES TECHNICAL SERVICES LLC | 5402 | Oman |
| MASS INVESTMENT | 4112 | Oman |
| METRON ENERGY APPLICATIONS LLC | 5002 | Oman |
| MOL WEST OMAN B.V | 2105 | Oman |
| MONTANSTAHL AG | S17 | Switzerland |
| MONTI POWER | 2024B | Germany |
| MUKHAIZNA INTERNATIONAL LLC | 2023A | Oman |
| MUTTRAH COAST FOR MODERN SERVICES | 5102 | Oman |
| NARIMAN TRADING CO. LLC | 5210 | United Arab Emirates |
| NATIONAL GAS COMPANY SAOG | 5205 | Oman |
| NATIONAL GAS COMPANY SAOG & BEINIT ENERGY | 5316 | Oman |
| NDT GLOBAL | 5211 | United Arab Emirates |
| OCCIDENTAL OF OMAN INC. | 3201 | Oman |
| OIL & GAS DIRECTORY M.E. | M6 | United Arab Emirates |
| OIL & GAS NEWS MAGAZINE (AL HILAL PUBLISHING) | M4 | Bahrain |
| OIL & GAS PAGES (ONG PUBLICATIONS) | M2 | United Arab Emirates |
| OMAN ECONOMIC REVIEW - UMS | M5 | Oman |
| OMAN GASKET FACTORY LLC / DOHAT AL KHALEEJ LLC | 4004 | Oman |
| OMAN INSTITUTE FOR OIL & GAS | 5204D | Oman |
| OMAN LNG | 4302 | Oman |
| OMAN OIL INDUSTRIES SUPPLIES & SERVICES CO LLC | 2114 | Oman |
| OMAN SOCIETY FOR PETROLEUM SERVICES (OPAL) | 3205A | Oman |
| OMANOILANDGAS.COM | M3 | Oman |
| OQ | 4101 | Oman |
| OXFORD BUSINESS GROUP | M1 | United Arab Emirates |
| PANTERRA MIDDLE EAST LLC | 3209 | Oman |
| PETROJET | 3207 | Egypt |
| PETROLEUM DEVELOPMENT OMAN LLC | 3001 | Oman |
| PFF MIDDLE EAST DWC LLC | 2106 | United Arab Emirates |
| PIONEER OILFIELD ENTERPRISES LLC | 4207 | Oman |
| PIONEERING ADVANCED TECHNOLOGIES LLC | 4116 | Oman |
| PORT OF DUQM COMPANY SAOC | 2503 | Oman |
| PROPROCESS | 3027 | South Africa |
| PSC TEKNOLOGIS | 5101 | Oman |
| QAHWAN PROJECTS | 2505 | Oman |
| QATAR PETROLEUM | 4001 | Qatar |
| RAS AL HAMRA LLC | 2301 | Oman |
| RAS AL HAMRA LLC | 2201,2401 | Oman |
| RAS AL HAMRA LLC | 2302 | Oman |
| RAS AL HAMRA LLC | 2202 | Oman |
| RAS AL HAMRA LLC | 2402 | Oman |
| RATNADEEP METAL & TUBES LTD INDIA | S20 | India |
| RATNAMANI METALS & TUBES LIMITED | S22 | Oman |
| REPUBLIC OF TATARSTAN | 5204B | Russian Federation |
| RHYTON SOLUTIONS GMBH | 4204 | Germany |
| ROCK FLOW DYNAMICS | 4306 | Oman |
| RUSSIAN PROMOTION GROUP | 5403 | Russian Federation |
| RUSSIAN PROMOTION GROUP | 5404 | Russian Federation |
| SAFETY TECHNICAL SERVICES | 4210A | Oman |
| SANCTUM WORK WEAR PRIVATE LIMITED | 4115 | India |
| SANDVIK | S29 | Sweden |
| SAROOJ CONSTRUCTION COMPANY | 5212 | Oman |
| SASOL PERFORMANCE CHEMICALS GMBH | 4303 | Germany |
| SCHLUMBERGER OMAN & CO LLC | 5401 | Oman |
| SCODA TUBES LTD | S18 | India |
| SERCK SERVICES INTERNATIONAL | 5428 | Oman |
| SEVEN SEAS PETROLEUM LLC | 3202 | Oman |
| SEVEN STARS OIL FIELDS EQUIPMENT TRADING FZE | 2111 | United Arab Emirates |
| SHEIDA INTERNATIONAL LLC | 5220 | Oman |
| SHELL DEVELOPMENT OMAN | 4201 | Oman |
| SIRIM QAS INTERNATIONAL SDN BHD | 5207 | Malaysia |
| SNF OMAN LLC | 2022 | Oman |
| SOCIETY OF PETROLEUM ENGINEERS | 3025 | United Arab Emirates |
| SOLUFORCE | 3029 | Netherlands |
| SPECIAL OILFIELD SERVICES CO LLC | 5340 | Oman |
| SPECIAL OILFIELD SERVICES CO. LLC - INSTRUMENTATION DIVISION | 5427 | Oman |
| SPECTRUM TECHNICAL SERVICES LLC | 2515 | Oman |
| STAROFIT | S8 | Germany |
| STEAMLINE INDUSTRIES LTD. (MARKETED BY GMT PIPES & TUBES PVT LTD) | S13 | India |
| STUDIO 52 / SHARPEAGLE | 5322 | India |
| SUN MARK STAINLESS | S1 | India |
| SUN POWER INTERNATIONAL GENERAL TRADING LLC | 2024A | Oman |
| SUNPOWER - SUPERTECH GROUP | 5305 | United Arab Emirates |
| SUPERIORITY OF MODERN SERVICES LLC SOMS | 5306 | Oman |
| SUPERLITE JOINTINGS PRIVATE LTD | 3051 | India |
| TECHNICAL SUPPLIES INTERNATIONAL COMPANY LLC | 2000 | Oman |
| TFI FILTRATION (INDIA) PVT. LTD | 3028 | India |
| TGT OILFIELD SERVICES | 4005 | Oman |
| THE HOT ENERGY GROUP | 4006A | Austria |
| THE OMAN EPC COMPANY (OMEPC) | 5208 | Oman |
| TIMESAVERS INTERNATIONAL | S44 | Netherlands |
| TMK | 3206 | Russian Federation |
| TOTAL E&P OMAN DEVELOPMENT B.V. - OMAN BRANCH | 3002 | Oman |
| TOTAL SAFETY | 3032 | United Arab Emirates |
| TRADEBE SERVICES LLC | 4118A | Oman |
| TRITORC ENGINEERING SERVICES AND TRADING LLC | 4305 | Oman |
| ULTRANODE | 4111 | Canada |
| UNICORN INTERNATIONAL LLC | 4102B | Oman |
| UNIVERSAL INSPECTION CO. LTD. | 5426A | Oman |
| VALUE ENGINEERING CENTER LLC | 2023 | Oman |
| VANGUARD ENGINEERING & OILFIELD SERVICES CO LLC | 4202 | Oman |
| VANGUARD OIL TOOLS & SERVICES LLC | 4102A | Oman |
| VANGUARD RESERVOIR SURVEILLANCE SERVICES LLC | 5203 | Oman |
| VORTEX OIL ENGINEERING SA | 5006 | Poland |
| VOSS EDELSTAHLHANDEL GMBH & CO. KG | S31 | Oman |
| WALEED ASSOCIATES LLC | 2107 | Oman |
| WELLTEC | 5320 | Denmark |
| WELSPUN | S14 | India |
| WHITEHOUSE FLEXIBLE TUBING LTD | 5209 | United Kingdom |
| YOKOGAWA | 5304 | Bahrain |
| ZAWAWI TRADING CO. LLC | 4118C | Oman |
| ZL EOR CHEMICALS | 3303 | China |