- Dredging & Mining
- IHC Beaver Dredgers B.V.
- IHC Deep Sea Dredging & Mining
- IHC Dredgers B.V.
- IHC Engineering Services B.V.
- IHC Holland B.V.
- IHC Marine and Mineral Projects
- IHC Mining
- MTI Holland B.V.
- Training Institute for Dredging (T.I.D.)
- Verenigde Scheepswerf Heusden B.V.
- Technology & Services
- IHC Drives & Automation B.V.
- IHC Engineering Business Ltd.
- IHC Fabrication
- IHC Fundex Equipment B.V.
- IHC Handling Systems V.O.F.
- IHC Hydrohammer B.V.
- IHC Hytop B.V.
- IHC Lagersmit B.V.
- IHC Metalix B.V.
- IHC Offshore Systems B.V.
- IHC Offshore Wind
- IHC Parts & Services B.V.
- IHC Piping B.V.
- IHC Sea Steel Ltd.
- IHC Systems B.V.
- IHC Vremac Cylinders B.V.
- IHC Interior B.V.
- Offshore & Marine
- IHC Offshore & Marine B.V.
- Merwede Design s.r.o.
- R-project d.o.o.