| Company | Timeline | Status | |
| Volker Dredging Limited Director • (part-time) Director | 17 Jun 1992←2 Months→20 Aug 1992 | Active | |
| Volkerwessels UK Limited Director • Company Director | 8 Jun 1992←2 Years 9 Months→23 Mar 1995 | Active | |
| Nash Dredging Limited Director • (part Time) Director | 19 Apr 1992←33 Years→Current | Active | |
| Volkerstevin Limited Director • Engineer | 28 Mar 1992←2 Years 12 Months→23 Mar 1995 | Active | |
