Mercury Yacht Construction
Netherlands · ZwijndrechtGrade B39 of 40Oceanco's wholly owned hull builder in Zwijndrecht, building steel hulls for 80 m-plus yachts in a 204 m hall on the former Heerema yard.
What happened, 2023 to 2026
- Aug 2025OwnerOceanco, and with it Mercury, bought by Gabe Newell
- Sep 2025BuildSecond 13,400 m2 complex bought next door
- Sep 2026Top seatNew general manager, from Royal Huisman operations and Royal IHC
What it adds up to. The hull plant of a yacht group, run like a steel-construction yard by people from dredger building and offshore fabrication.
Who runs it
- General Managersince 2026
- Manager Productionsince 2023
- Manager Operationssince 2026
- Manager engineeringsince 2024
Organisation. Hull plant: general manager, operations, production, engineering
What it shows for a new yard. The model for the hull-building half of a greenfield yard: general manager, operations, production, engineering, planning.
Former leaders now elsewhere1 people who held a top or senior seat here
- now Manager Engineering at Vitters Shipyard
Organisation chartthe top seat, the senior layer by function, and the managers where the top team is small; the number two is marked
Engineering and design1 senior, 2 managers | Production and operations2 senior, 6 managers | Purchasing1 managers |
 Corné Koorneef Manager engineering since 2024  Catalin Popa Lead engineer since 2024  Marcel van der Waal Lead engineer since 2025 |  John van Empel Manager Production since 2023  Tom van Stenis Manager Operations since 2026  Hans Benard Production leader, assembly since 2020  José Melaard Production leader since 2026 LV Louis van den Bosch Production leader, subcontracting since 2022  Simon Van Nieuwenhuijzen Production leader, workshop since 2024  Stefan van Amelsvoort Manager, planning office since 2024  Tom van Os Production project leader since 2025 |  Robin Klomp Warehouse leader since 2026 |
Number twoNo number two. A general manager over three managers (production, operations, engineering), all hired since 2023.
The top team as read on LinkedIn37 people read as staff, October 2026
A General Manager (Sep 2026, from Royal Huisman and IHC operations) over a Manager Operations (Sep 2026, from Heerema), Manager Production (2023, from Oceanco), Manager Engineering (2024, from IHC), planning office manager, production leaders per workshop, lead engineers; staffed heavily from Royal IHC and the Zwijnenburg yard it replaced.
Mercury is Oceanco's hull and superstructure subsidiary, 40 people on LinkedIn, organised as a steel-construction plant: general manager, operations, production, engineering, planning. Its leaders come from dredger-building (IHC) and offshore fabrication (Heerema), not from yachting. The most 'shipbuilding' organisation on the list, and the model for the hull-building half of a new yard.
Engineering and design 1
Production and operations 2
Engineering and design 2
Production and operations 6
Purchasing and supply chain 1
24 more people read as staff below manager level: see them in the directory.
Seats and dates are as the people describe them on LinkedIn; a person who moved in the last months can still show the old seat. Tap a person for the profile and the reading.
Facts and news, with sourcesthe research behind the overview
Show the facts and the dated news with their sources
Identity
- Full name: Mercury Yacht Construction B.V. ("an Oceanco company"). source
- Founded: 2020, "to control the primary build process, secure enough capacity, and keep high-quality knowledge in-house.".
- Headquarters and yard: Noordweg 8, 3336 LH Zwijndrecht, Netherlands, on the former Heerema Fabrication Group yard that Oceanco bought in 2019 (Oceanco press release, 2019-05-20). source 1 source 2
- Ownership: 100% owned by Oceanco Group ("Mercury is fully owned by Oceanco Group and takes care of building Oceanco's new hulls"). source
- Ultimate owner: Oceanco was bought by Gabe Newell (Valve co-founder) from the Barwani family in 2025-08. source 1 source 2
- Sister companies (Oceanco Group): Lateral Naval Architects, Aluship, and Alewijnse (systems integrator, joined 2025-08). source
Size
- Employees: not found. The company says only that most of the team is relatively young. source
- Revenue: not found (subsidiary, not published separately).
- Boat International Global Order Book: not applicable; Mercury builds hulls for Oceanco projects, which are counted under Oceanco.
- Facilities (company statement, undated page read 2026-10-21): 144,000 m² structural and refit site; construction hall 204 x 50 x 30 m (4 x 35 t overhead cranes, 6 x 8 t semi-gantry cranes); refit hall 132 x 50 x 38 m (2 x 75 t cranes); 400 m quay. source
- 2025-09: Oceanco bought a second complex at Noordweg 15A, Zwijndrecht (about 13,400 m²); its use was not stated. source
Product
- What it does: builds steel hulls (casco) of Oceanco superyachts (80 m plus), supports refit construction work for Oceanco Life Cycle Support, and is open to third-party construction work. source
- Hull materials: high-grade steel. source
- Series / semi-custom / full-custom: not applicable; it is a structural subcontractor for full-custom Oceanco yachts. No own model lines.
- Hull flow: hulls are built in Zwijndrecht, then moved about 10 km by water to Oceanco's outfitting yard in Alblasserdam (Oceanco, 2019-05-20). source
- Notable deliveries 2023 to 2026: no named hull credited to Mercury in public press. Not found.
- Training: runs "De Vakschool", a paid work-study programme for hull builders and welders (3 days work, 2 days school), with partners Zwijnenburg Shipyards, Bayards Yacht Structures and Scheepswerf Slob. source
Leadership
- Managing Director: Mark Mieras, as of an undated customer reference page (site footer 2026). source
- Team listed on the company site, as of 2026-10-21 (page undated): Corné Koorneef (Manager Engineering), Jermain de Wit (Production Coordinator), Coen Lodder (Production Engineer), Stefan van Amelsvoort (Manager Bedrijfsbureau). source
- Parent CEO: Marcel Onkenhout, Oceanco CEO, as of 2025-08 (quoted on the Alewijnse deal). source
News 2023 to 2026
- 2025-09
Oceanco buys a further 13,400 m² complex at Noordweg 15A in Zwijndrecht, next to Mercury's site.swzmaritime.nl
- 2025-08
Oceanco Group, Mercury's parent, acquires systems integrator Alewijnse; Mercury is named as an existing group company.yachtbuyer.com
- 2025-08
Gabe Newell buys Oceanco (and with it Mercury) from the Barwani family.swzmaritime.nl