| ABRAJ ENERGY SERVICES S.A.O.C | 4202 | Oman |
| ADVANCED POWER SWITCHGEAR COMPANY LLC | 5415 | Oman |
| AGILITY LOGISTICS COMPANY (GLOBAL LOGISTICS OMAN LLC) | 5011 | Oman |
| AL MOURID FOR OIL SERVICES LLC | 5310 | Oman |
| AL NAFIE STEEL LLC | 5104 | United Arab Emirates |
| AL SUMRI TRADING & CONTRACTING ESTABLISHMENT | 2505 | Oman |
| ALFANAR ENGINEERING SERVICES | 2405 | Saudi Arabia |
| APERGY MIDDLE EAST LLC | 4203 | Oman |
| APPLIED PHYSICS SYSTEMS | 5306 | United States |
| ARA PETROLEUM LLC | 3120 | Oman |
| ARABIAN PIPES CO | 4105 | Saudi Arabia |
| ARCELORMITTAL TUBULAR PRODUCTS JUBAIL | 4002 | Saudi Arabia |
| ASIA BOLTS INDUSTRY (FZC) LLC | 3220 | Oman |
| ATLAS COMMERCE & ENERGY LLC | 5006 | Oman |
| ATMOS INTERNATIONAL | 2517 | United Kingdom |
| BAKER HUGHES | 2301 | United Arab Emirates |
| BINDER EDELSTAHL PRODUKTIONSGES. MBH | S21 | Germany |
| BINZAGR FACTORY FOR INSULATION MATERIALS LTD. | 5204C | Saudi Arabia |
| BLASTLINE LLC | 2117 | United Arab Emirates |
| BOLLINGHAUS STEEL GMBH | S14 | Germany |
| BP EXPLORATION (EPILSON) LTD | 3101 | Oman |
| BREDA ENERGIA S.P.A. | 2515 | Italy |
| BUSINESS GATEWAYS | 5004 | Oman |
| CALTROLS MIIDLE EAST | 2506 | Oman |
| CANADIAN SCOTTISH CO. LLC | 5103 | Oman |
| CARL STAHL LIFTING EQUIPMENT INDUSTRIES LLC | 5321 | United Arab Emirates |
| CASAGRANDE ELETTROCOSTRUZIONI S.P.A | 4121 | Italy |
| CC ENERGY DEVELOPMENT S.A.L (OMAN) | 5301 | Oman |
| COMPASS OIL SERVICES LLC | 4221 | Oman |
| COMPLETION OIL TOOLS PRIVATE LIMITED | 5204A | India |
| COMPOSITE PIPES INDUSTRY LLC | 4110 | Oman |
| COMPUTER MODELLING GROUP LTD | 4022 | Canada |
| CROWNE PLAZA MUSCAT OMAN CONVENTION AND EXHIBITION CENTER | 5012 | Oman |
| CRYSTAL INTERNATIONAL TECHNOLOGY & TRADING LLC | 3307 | Oman |
| CTS MIDDLE EAST BAHRAIN WLL | 3010 | Bahrain |
| DALEEL PETROLEUM LLC | 5001 | Oman |
| DELTA CORPORATION | 3105 | Qatar |
| DIVINE TUBES PVT. LTD | S12 | India |
| DRUPPS AB | 5104B | Sweden |
| DSCAFF ENGINEERING SDN. BHD | 2408 | Malaysia |
| ECARYS GMBH | 5323 | Germany |
| ELIXIR ENGINEERING - PROCESS SAFETY I FIRE & GAS I ENGINEERING DESIGN & CONSULTACY | 5102B | Oman |
| ENERWHERE SUSTAINABLE ENERGY | 2415 | United Arab Emirates |
| ENI SPA | 2401 | Italy |
| EUGENIE.AI | 5010 | United States |
| FIELDAQ AS | 2017 | Norway |
| FIRST FILTER LLC | 2020 | Oman |
| FOS ENERGY LLC | 5201 | Oman |
| FUTURE OILFIELD SUPPLY AND SERVICES LLC | 2402 | Oman |
| G.M. INTERNATIONAL SRL | 4120 | Italy |
| GATES ENGINEERING & SERVICES LLC | 4020 | Oman |
| GERBER HOLDING GMBH | S17 | Germany |
| GLOBAL COMPUTER SERVICES | 2307 | Oman |
| GLOBAL INDUSTRIAL SERVICES LLC | 4222 | Oman |
| GOLDEN HARBOUR LLC | 2115 | United Arab Emirates |
| GULF ENERGY SAOC | 3102 | Oman |
| HALLIBURTON WORLD WIDE LIMITED | 3302 | Oman |
| HART BV | S23 | Netherlands |
| HEMA ENERGY | 3320 | Oman |
| HORIZON CAPITAL DIAMOND TRADE | 2320 | Oman |
| HORMUZ ENERGY SERVICES | 2406 | Oman |
| HY-LOK MIDDLE EAST | 5206 | United Arab Emirates |
| HYTORC | 5003 | Oman |
| IBD GROUP | 2005 | Oman |
| INFLOWCONTROL | 2025 | Oman |
| INTERWELL | 5405 | Oman |
| ITECO OILFIELD SUPPLY ME FZCO | 5410 | United Arab Emirates |
| JKL HARDWARE PRODUCTS CO LTD | S24 | China |
| JSC OZNA METERING SYSTEMS | 5208A | Russian Federation |
| KANAT PAINTS & COATINGS | 4102 | Turkey |
| KOSO GULF LLC | 4220 | Oman |
| LANGLEY ALLOYS | S26 | United Kingdom |
| LOTO SAFETY PRODUCTS DMCC | 2222 | United Arab Emirates |
| LST LINSTER STAINLESS TRADING GMBH | S3 | Germany |
| MAHA ENERGY | 5102A | Canada |
| MAJEES TECHNICAL SERVICES LLC | 5402 | Oman |
| MASS INVESTMENT | 2317 | Oman |
| METRON ENERGY APPLICATIONS LLC | 5002 | Oman |
| MIDDLE EAST SCIENTIFIC EQUIPMENT CORP LLC | 5104A | Oman |
| MOL WEST OMAN B.V | 2302 | Oman |
| MONTANSTAHL AG | S13 | Switzerland |
| MONTI POWER | 3022 | Germany |
| 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 | 5312 | 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 | 4010 | Oman |
| OMAN LNG | 4302 | Oman |
| OMAN OIL INDUSTRIES SUPPLIES & SERVICES CO LLC | 4310 | Oman |
| OMAN SOCIETY FOR PETROLEUM SERVICES (OPAL) | 3322 | Oman |
| OMANEXPO LLC | 2417 | Oman |
| OMANOILANDGAS.COM | M3 | Oman |
| ORYX METAL INDUSTRIES LLC | 5210A | Oman |
| OXFORD BUSINESS GROUP | M1 | United Arab Emirates |
| PANTERRA MIDDLE EAST LLC | 2120 | Oman |
| PETROJET | 3215 | Egypt |
| PETROLEUM DEVELOPMENT OMAN LLC | 3001 | Oman |
| PFF MIDDLE EAST DWC LLC | 3015 | United Arab Emirates |
| PIONEER OILFIELD ENTERPRISES LLC | 2205 | Oman |
| PIONEERING ADVANCED TECHNOLOGIES LLC | 2407 | Oman |
| PORT OF DUQM COMPANY SAOC | 3305 | Oman |
| PROPROCESS | 2215 | South Africa |
| PSC TEKNOLOGIS | 5101 | Oman |
| QAHWAN PROJECTS | 2502 | Oman |
| QATAR PETROLEUM | 4001 | Qatar |
| RAS AL HAMRA LLC | 2002 | Oman |
| RAS AL HAMRA LLC | 2202 | Oman |
| RAS AL HAMRA LLC | 2101 | Oman |
| RAS AL HAMRA LLC | 2001,2201 | Oman |
| RAS AL HAMRA LLC | 2102 | Oman |
| RAY INTERNATIONAL OIL & GAS LLC | 4302A | Oman |
| REPUBLIC OF TATARSTAN | 5204B | Russian Federation |
| ROCK FLOW DYNAMICS | 5420 | Oman |
| RUSSIAN PROMOTION GROUP | 4005 | Russian Federation |
| RUSSIAN PROMOTION GROUP | 4007 | Russian Federation |
| SANCTUM WORK WEAR PRIVATE LIMITED | 2322 | India |
| SANDVIK | S19 | Sweden |
| SAROOJ CONSTRUCTION COMPANY | 5212 | Oman |
| SASOL PERFORMANCE CHEMICALS GMBH | 3205 | Germany |
| SCHLUMBERGER OMAN & CO LLC | 5401 | Oman |
| SCODA TUBES LTD | S16 | India |
| SERCK SERVICES INTERNATIONAL | 5225 | Oman |
| SEVEN SEAS PETROLEUM LLC | 3202 | Oman |
| SEVEN STARS OIL FIELDS EQUIPMENT TRADING FZE | 3021 | United Arab Emirates |
| SHEIDA INTERNATIONAL LLC | 5220 | Oman |
| SHELL DEVELOPMENT OMAN | 4301 | Oman |
| SILVERBACK DISTRIBUTION | S20 | U.S.A. |
| SIRIM QAS INTERNATIONAL SDN BHD | 5207 | Malaysia |
| SNF OMAN LLC | 3020 | Oman |
| SOCIETY OF PETROLEUM ENGINEERS | 2022 | United Arab Emirates |
| SOLUFORCE | 2220 | Netherlands |
| SPECIAL OILFIELD SERVICES CO. LLC - INSTRUMENTATION DIVISION | 4305 | Oman |
| SPECTRUM TECHNICAL SERVICES LLC | 2520 | Oman |
| STAROFIT | S2 | Germany |
| STUDIO 52 / SHARPEAGLE | 5322 | India |
| SUN MARK STAINLESS | S1 | India |
| SUNPOWER - SUPERTECH GROUP | 5305 | United Arab Emirates |
| SUPERLITE JOINTINGS PRIVATE LTD | 2217 | India |
| TECHNICAL SUPPLIES INTERNATIONAL COMPANY LLC | 3301 | Oman |
| TFI FILTRATION (INDIA) PVT. LTD | 2422 | India |
| TGT OILFIELD SERVICES | 4012 | Oman |
| THE HOT ENERGY GROUP | 2015 | Austria |
| THE OMAN EPC COMPANY (OMEPC) | 5208 | Oman |
| TIMESAVERS INTERNATIONAL | S25 | Netherlands |
| TMK | 3310 | Russian Federation |
| TOTAL E&P OMAN DEVELOPMENT B.V. - OMAN BRANCH | 3002 | Oman |
| TOTAL SAFETY | 2420 | United Arab Emirates |
| TRADEBE SERVICES LLC | 5225A | Oman |
| TRITORC ENGINEERING SERVICES AND TRADING LLC | 3203 | Oman |
| ULTRANODE | 2315 | Canada |
| UNIVERSAL INSPECTION CO. LTD. | 2122 | Oman |
| VALUE ENGINEERING CENTER LLC | 2310 | Oman |
| VOSS EDELSTAHLHANDEL GMBH & CO. KG | S8 | Oman |
| WAHIBA ENERGY | 2305 | Oman |
| WALEED ASSOCIATES LLC | 3315 | Oman |
| WALZWERKE EINSAL GMBH | S6 | Germany |
| WELLTEC | 5320 | Denmark |
| WELSPUN | S4 | India |
| YOKOGAWA | 5304 | Bahrain |
| ZAWAWI TRADING CO. LLC | 5007 | Oman |
| ZL EOR CHEMICALS | 3303 | China |