| OACU |  | | CY | Linde - Hadjikyriakos Gas Ltd. | www.linde-gas.com.cy/ | |
| OACU | | | JP | Orix Auto Corporation | | |
| OAFU | | | ZA | Orca Africa Pty. Ltd. | www.orcafuels.co.za/ | |
| OAKU | | | US | Oak Ridge National Laboratory | www.ornl.gov/ | |
| OAKU | | | JP | Osaka Asahi Kaiun Co.,Ltd. | www.o-asahi.co.jp/ | |
| OASU | | ocean axis shipping line | AE | Ocean Axis Shipping Services LLC. | www.oceanaxis.com/ | |
| OBCU | | | SR | NV. Cobo Construction | www.coboholding.com/ | |
| OBLU | | oceanblu | SG | OceanBlu Shipping (S) Pte. Ltd. | www.oblu.com.sg/ | |
| OBTU | | | CN | Jiangsu O-Best New Materials Co., Ltd. | www.o-bestjs.com/ | |
| OCAU |  | | CY | Ocean Box Containers Ltd. | oceanboxcontainers.com/ | |
| OCBU | | sitc | CN | Ocean Blue Finance Group Ltd. | www.oceanbluefg.com/ | |
| OCCU | | | NL | Orange Container Line BV. | www.orangecontainerline.com/ | |
| OCCU | | | | | | |
| OCEU | | oceanex | CA | Oceanex Inc. | www.oceanex.com/ | |
| OCEU | | | EG | Ocean Express Agency | www.oceanexpressag.net/ | |
| OCGU | | ocg | US | Textainer Equipment Management Ltd. | www.textainer.com/ | |
| OCIU | | | US | Arkema Chemicals Inc. | www.arkema.com/ | |
| OCLU | | p&o | DK | Maersk A/S. | www.maersk.com/ | |
| OCNU | | | US | Oceanic Containers LLC. | | |
| OCOU | | | HK | Aonoco Ltd. | www.aonoco.com/ | |
| OCPU | | fahrenheit | BE | Ocean Cloud BV. | oceancloudgroup.com/ | |
| OCSU | | | AU | | | |
| OCTU | | ocean | ES | Ocean Containers Trading S.L. | contenedoresmaritimos.eu/ | |
| OCTU |  | samskip | NL | Samskip Multimodal Container Logistics BV. | www.samskip.com/ | |
| OCVU | | occ | NL | Overbeek Container Control | overbeekbv.nl/ | |
| ODDU | | | ZA | Welfit Oddy (Pty.) Ltd. | www.oddy.co.za/ | |
| ODSU | | | UA | Metall Progess | | |
| OEGU | | oeg | SG | OEG Offshore Pte. Ltd. | www.oegoffshore.com/ | |
| OERU | | cosco | US | Precise Asset Sourcing LLC. | | |
| OEWU | | | AU | | | |
| OEXU | | | ES | Marguisa Shipping Lines S.L.U. | www.marguisa.com/ | |
| OFFU | | cca | NL | CARU Containers BV. | www.carucontainers.com/ | |
| OFSU | | ohs | GB | Oilfield Hire & Services Ltd. | www.ohsuk.com/ | |
| OFTU | | | HK | Ocean First Logistics Ltd. | www.oceanfirst.com.hk/ | |
| OGPU | | | RU | Roza Mira LLC. | rozamira.ru/ | |
| OGTU | | orphan grain train | US | Orphan Grain Train Inc. | www.ogt.org/ | |
| OHKU | | | US | Tokyo Ohka Kogyo America Inc. | www.tokamerica.com/ | |
| OILU | | | AU | Oil2U Pty. Ltd. | oil2u.com.au/ | |
| OJCU | | | | | | |
| OKAU | | okanagan containers | CA | Okanagan Containers | okanagancontainers.com/ | |
| OKAU | | a logistics | JP | Japan Alcohol Logistics Co., Ltd. | www.aruhan.gr.jp/logistics/f2.html | |
| OKBU | | | US | O.K. Logistics Inc. | www.oklogistics.net/ | |
| OKCU | | cahata | SG | Cahaya Samudera Shipping Pte. Ltd. | www.cahayasamudera.com/ | |
| OKFU | | kurios | CA | Cirque du Soleil Inc. | www.cirquedusoleil.com/kurios | |
| OKFU | | | | | | |
| OKKU | | | JP | Okinawa Kasei Kogyo Co., Ltd. | | |
| OKPU | | | US | O.K. Logistics Inc. | www.oklogistics.net/ | |
| OKTU | | | US | OK Trans | | |
| OKWU | | ndunese | MY | Ndunese Sealand Sdn. Bhd. | ndunese.com/ | |
| OLCU | | | LT | Oilcore UAB. | oilcore.eu/ | |
| OLFU | | | CY | Olvi Forwarding Ltd. | www.olvi.ltd/ | |
| OLMU | | | US | Oceanus Line | oceanusline.us/ | |
| OLSU | | one stop | PH | One Stop Logistics Solutions | www.msl.com.ph/ | |
| OLSU | | | RU | Optimal Logistics LLC. | optimalog.ru/ | |
| OLTU | | | US | Odyssey Foodtrans LLC. | www.odysseylogistics.com/ | |
| OMAU | | | AU | Omni Tanker Pty. Ltd. | omnitanker.com/ | |
| OMAU | | oman | IE | Oman Secure Storage ( Oman Transport Ltd. ) | oman.ie/ | |
| OMBU | | | AR | Missionline Logistics S.A. | missionline.com.ar/ | |
| OMCU | | omega chemicals | AU | Omega Chemicals Pty. Ltd. | omegachem.com.au/ | |
| OMHU | | | RU | Economtrade LLC. | holding-omega.com/ | |
| OMLU | | | AE | Axis Fert Trade Dmcc. | www.orbitcargomanagement.com/ | |
| OMNU | | | IT | Air Liquid Italia Service S.r.l. | | |
| OMPU | | | IT | OMP Engineering Srl. | www.omp-italia.com/ | |
| OMRU | | | IL | 1M Robotics | www.1mrobotics.com/ | |
| OMSU | | | PT | Orica Mining Services Portugal | www.orica.com/ | |
| OMXU | | | MX | Olam Energy, S.A. de C.V. | www.olamenergy.com/ | |
| ONBU | | | MY | Oceanus Container Lines Pte. Ltd. | oceanus-lines.com/ | |
| ONEU | | one | SG | Ocean Network Express Pte. Ltd. | www.one-line.com/ | |
| ONKU | | | JP | | | |
| ONLU | | asyad | OM | Oman Shipping Company S.O.A.C. | www.omanship.co.om/ | |
| ONPU | | | AE | OnePort CLine DWC. LLC. | www.oneportcline.com/ | |
| ONPU | | one | SG | Ocean Network Express Pte. Ltd. | www.one-line.com/ | |
| ONTU | | onto | HK | New Onto Shipping International Ltd | | |
| ONVU | | | JP | | | |
| OOCU | | | JP | Sumitomo Corporation | www.sumitomocorp.com/ | |
| OOCU | | oocl | HK | Orient Overseas Container Line Ltd. | www.oocl.com/ | |
| OOLU | | oocl | HK | Orient Overseas Container Line Ltd. | www.oocl.com/ | |
| OOOU | | | FR | Unauthorised prefix (on B.I.C. authority) | www.bic-code.org/ | |
| OOTU | | otlo | AE | Otlo Shipping Line | www.otloline.com/ | |
| OPDU | | opdr | FR | CMA CGM | www.cma-cgm.com/ | |
| OPGU | | | US | Ogden Polar Group | ogdenpolar.com/ | |
| OPLU | | | SG | Oceans Private Ltd. | | |
| OPRU | | | RU | Operator LLC. | tekoperator.ru/ | |
| OPTU | | terca | AT | Wienerberger AG. | www.wienerberger.com/ | |
| OPTU | | odyssey | US | Odyssey Foodtrans LLC. | www.odysseylogistics.com/ | |
| ORAU | | intermodal logistics | RU | Intermodal Logistics Plus LLC. | intermodals.com/ | |
| ORBU | | orbit | KE | Orbit Chemical Industries | www.orbitchem.com/ | |
| ORCU | | tml | ZA | Orca Container Asset Management | www.orca-sa.com/ | |
| ORDU | | oris intermodal | CA | Oris Intermodal Ltd. | | |
| OREU | | | RU | Orient Express LLC. | www.oriexp.ru/ | |
| ORGU | | | TR | Oregon Teknoloji Hizmetleri A.S. | oregon.com.tr/ | |
| ORIU | | vinci & campagna | IT | Vinci & Campagna SpA. | www.vinciecampagna.it/ | |
| ORNU | | | FR | Orano Cycle | www.orano.group/fr/ | |
| OROU | | | IT | Autogasservice Srl. | www.autogasorobica.it/ | |
| ORPU | | | RU | Ocetrovskiy River Port ojc. | | |
| ORPU | | orpic | OM | OQ SAOC. | oq.com/ | |
| ORTU | | ucl | SG | Ueno Container Logistics | www.uenologistics.com/ | |
| ORTU | | | RU | OOO Atlant | atlantrails.ru/ | |
| ORXU | | | | | | |
| OSCU | | oci | KR | OCI Company Ltd. | www.oci.co.kr/ | |
| OSEU | | stolt | ZA | Ovenstone Holdings (Pty) Ltd. | | |
| OSHU | | omega | CZ | Omega Servis Holding a.s. | www.omegaservis.com/ | |
| OSKU | | oceanic | HK | Oceanic Star Line HK Ltd. | star-liners.com/ | |
| OSLU | | ostermann | DE | Ostermann Transporte GmbH. | ostermanntransporte.com/ | |
| OSMU | | | NZ | Koppers Performance Chemicals New Zealand | www.kopperspc.co.nz/ | |
| OSMU | | oss | AU | OSS Worldwide Movers | www.ossworldwidemovers.com/ | |
| OSPU | | | PE | Oxigeno Santa Clara S.A.C. | santaclarasac.com/ | |
| OSRU | | | DE | Siemens AG. | www.siemens.com/ | |
| OSSU | | oss | AU | OSS Worldwide Movers | www.ossworldwidemovers.com/ | |
| OSTU | | | DE | Suncontract GmbH. | suncontract.ch/ | |
| OTAU | | otal | FR | CMA CGM | www.cma-cgm.com/ | |
| OTEU | | | US | CAI International Inc. | www.capps.com/ | |
| OTFU | | | FR | Onet Technologies | www.groupeonet.com/ | |
| OTGU | | ocean transport | PH | Ocean Transport Group of Companies Inc. | oceantransportgroup.com/ | |
| OTKU | | | RU | OTK LLC. | otk.ag/ | |
| OTLU | | fuji oil asia | SG | Fuji Oil Asia Pte., Ltd. | www.fujioil.asia/ | |
| OTLU | | otl | MY | Overland Total Logistic Services (M) Sdn. Bhd. | www.otlsb.com/ | |
| OTNU | | | MT | Multigas Ltd. | www.multigas.com/ | |
| OTPU | | | US | SeaCube Container Leasing Ltd. | seacubecontainers.com/ | |
| OTTU | | ottevanger | NL | Ottevanger Milling Engineers | www.ottevanger.com/ | |
| OTXU | | stradtmann | | | | |
| OULU | | kylmäkontit | FI | Oulun Konttivuokraus Oy | www.konttivuokraus.fi/ | |
| OUSU | | | JP | Ogawa Unso So Ltd. | | |
| OUTU | | | FI | Outotec (Finland) Oy. | www.mogroup.com/ | |
| OVFU | | | UA | Overfood LLC. | | |
| OVLU | | ovl | FI | O.V. Lahtinen Oy. | www.ovlahtinen.fi/ | |
| OVZU | | ovz-trans | BY | EMG Trans LLC. | emgtrans.by/ | |
| OWLU | | one way | US | One Way Leasing Inc. | www.onewaylease.com/ | |
| OWMU | | mtc | AE | M/S. Magnum Technology Center | www.mtc-intl.com/ | |
| OWNU | | | IT | Tarros Spa. Compagnia di Navigazione | www.tarros.it/ | |
| OXGU | | oxigas | ES | Oxigeno y Gases Licuados de Canarias S.L. | | |
| OXGU | | | SV | Infra de El Salvador S.A. de C.V. | www.infrasal.com/ | |
| OXMU | | | HN | Aires Maya S.A. de C.V. | | |
| OXNU | | oxon | IT | Sipcam Oxon SpA. | www.sipcam-oxon.com/ | |
| OXYU | | | FR | Oxymontage | www.oxymontage.com/ | |
| OYSU | | oys line | JP | OYS Line | www.oysnet.com/ | |
| OZMU | | | BY | GJSC. Otew | oztm.by/ | |
| OZRU | | | TR | Özer Elektrik San. Ve Tic. Ltd. Şti. | ozerelektrik.com/ | |
| OZTU | | özturk container | TR | Özturk Nakliyat ve Insaat San Tic Ltd. | www.ozturkcontainer.com/ | |
