- Hyphose Ltd
- Hypteck AS
- I.C. Brindle & Co. Ltd
- Icom (UK) Ltd
- ICS ELECTRONICS
- IMO AB
- IMP
- Index Marine Ltd
- INDUSTRIMARIN AS
- Infrafone AB
- INTERLINKS MARINE SERVICES Ltd
- International Paint Ltd
- Intl Safety Products Ltd
- IronPump A/S
- ISIC A/S
- Ixsea Limited
- J A Harrison & Co (Manchester) Ltd
- Jensen & Rhoden Europe Marine Control AS
- John Gjerde AS
- JOTRON SatCom AS
- JOWA AB
- JS COCK AS
- JSC MABROCONA
- Karmoy Hire AS
- Karmoy Winch AS
- Kawasaki Precision Machinery UK Ltd
- KELVIN HUGHES
- KEMPPI OY
- Keytouch Technology
- Kilkanen Oy
- KJ Hydraulik
- Knowsley Instrument Serv Ltd
- KOCKUM SONICS AB
- Koja Marine
- Konecranes Lifttrucks AB
- Kongsberg Maritime
- Kongsberg Maritime AS (formerly SIMRAD SUBSEA A/S)
- KPM Marine D E Ltd
- KROHNE Skarpenord
- Kumera
- KUMERA OY
- Kyma AS
- Lansihydro Ltd.
- LAUTEX AB OY
- Lawson Engineers Ltd
- LEC Marine Ltd
- LIDO MARINE
- Lifting & Marine Services Ltd
- Liftra ApS
- Littelfuse SELCO A/S
- LOIPART LTD
- LONNE SCANDINAVIA AS
- Lopolight ApS
- LOTEK A/S
- LSM Pumper
- LYNGSO MARINE A/S
- MacArtney A/S
- MacGregor HYDRAMARINE AS
- MacGregor Marine Equipment Ltd
- MAGISTR SIA
- MAN B&W DIESEL A/S
- MAN Engines & Components UK
- Mantsbrite Marine Electr
- Marco Marine A/S
- MARE SAFETY AS
- MARINE ALUMINIUM AS
- MARINE COMMUNICATIONS Ltd.
- MARINE CONTROL SERVICES AS
- Marine Logistics Limited
- Marine Rescue Technologies Ltd
- Marine Technic
- Marine Technologies LLC
- MarineShaft Hirtshals A/S
- Marinfloc AB
- MARIOFF CORPORATION OY
- MARITEAM A/S
- MARITIME MOBLER AS
- MARITIME MONTERING AS
- MARITIME PROGRESS Ltd.
- Marketing Direct One
- Markus Lifenet Ltd.
- MARLINK AS
- MARTIN BRUUSGAARD & Co. AS
- Mayflower Engineering Ltd
- McMurdo Ltd
- MCT BRATTBERG AB
- MEDI3 MARINE
- MEGACON AS
- Megalight Systems Oy
- MEKANORD A/S
- Merima Ltd
- Merlin Diesel Systems Ltd
- MESON AB
- Metalast LTD
- Metos Marine
- Midcontinent (Aberdeen) Limited
- Miko Marine AS
- MMC (Europe) Ltd.
- MML Marine Ltd
- MODELL MOBLER AS