- Blew Stoub
- Bloctube Marine Services Ltd
- BLOMMAERT NV
- BLUCHER METAL A/S
- Bode GmbH
- Boening Automationstechnologie GmbH & Co KG
- Bold Nu-Tec Insulation Product
- Bolidt Synthetic Products & Systems
- Boll & Kirch Filterbau GmbH
- Bolton Gate Co Ltd
- Bopp & Reuther Messtechnik GmbH
- BORGER GmbH
- Brauer Ltd
- Breman Shipping Installation
- Bridon Marine Systems & Servic
- Bristol Uniforms Ltd
- Britannia Marine Services
- Brooksbank Valves Limited
- Brude Safety AS
- BRUSH Turbogenerators
- Brusselle Marine Industries
- Buffers Marine AB
- C-Nautical B.V.
- C.C.JENSEN A/S
- C.M. HAMMAR
- C.N.S. SYSTEMS AB
- C2SAT COMMUNICATIONS AB
- CA Clase (UK) Ltd
- CAC Industrial Products Ltd
- Cactus 020 Ltd
- Calder Ltd (UK)
- Caley Ocean Systems Ltd
- Campbell Scientific Ltd.
- Capital Equipment Supply Co Ltd
- Cargo Care Solutions B.V
- CARGOMAXX
- Carlson Filtration Ltd
- CARPENTER Ltd.
- CASSENS & PLATH GmbH
- Castrol Marine Ltd
- Caterform Ltd
- Caterpillar Marine Power Systems
- Caterpillar Propulsion Sweden (previously BERG PROPULSION AB)
- CATHELCO GROUP
- CBI Engineering AS
- CEDES EUROPE
- CENTA Antriebe Kirschey GmbH
- CENTA Transmissions Ltd.
- Central Industry Group (CIG)
- Cetrac GmbH
- CGG VERITAS / LAND DIVISION / SWOBS
- Chase Protective Coatings Ltd,
- CHEVRON PRODUCTS SCANDINAVIA AB
- CHRIS-MARINE AB
- Christie & Grey Ltd
- Citreon-Messian-Durand
- CLA-VAL UK Limited
- Class Instrumentation Ltd
- CLAYTON OF BELGIUM NV
- CLAYTON SCANDINAVIA AS
- Cleemann Chair-Systems GmbH
- Clements Engineering (St Neots) Ltd
- CLIMAX GmbH
- CLYDEUNION Pumps
- CM Technologies GmbH (formerly Kittiwake GmbH)
- CMI Marine
- CMR Controle Mesure Regulation
- CNAi
- CNIM
- COATES OFFSHORE
- Coldharbour Marine Ltd
- ColorLight AB
- Coltraco Ltd
- COMBIMAC B.V.
- COMET GMBH
- Compass Marine Services
- COMPRESSED AIR CENTRE
- COMROD A/S
- CONRAC GmbH
- Consilium AB
- Consilium Marine & Safety AB
- Consilium Marine Systems BV
- CONVOTHERM Elektrogeraete GmbH
- Cooper Roller Bearings Co Ltd
- Coops en Nieborg B.V.
- Corrosion & Water-Control Shared Services BV
- COSALT BV (Survitec Group)
- Cosalt GmbH
- Cosalt Head Office
- Cramer Systemtechnik GmbH
- Cramm Yachting Systems
- Crestchic Loadbanks
- Crewsaver Marine Equipment
- Croon Elektrotechniek BV
- CUMMINS NORWAY AS
- Cygnus Instruments Ltd
- D I DAVIT INTERNATIONAL GmbH
- Damen Anchor & Chain Factory (AKF)
- DANFOSS A/S
- Daniamant Electronics A/S (formerly Uni-Safe Electronics A/S)