Mainprize Offshore

What Mainprize Offshore does

Mainprize Offshore Ltd is a privately held UK marine services company headquartered in Scarborough, North Yorkshire, that operates a fleet of 11 purpose-built Crew Transfer Vessels (CTVs) serving the offshore renewable energy sector. The company began its renewable energy operations in 2013, initially conducting seabed surveys, risk assessments, and traffic surveys before expanding into CTV operations, and traces its maritime heritage to a family fishing business dating back 350 years. The vessel portfolio splits between two design lineages: MO1 and MO2 were designed by Tecknicraft (New Zealand), while MO3 through MO11 were designed by Walker Marine Design (UK), with the high-performance MO5-MO11 class achieving market-leading personnel transfer capability in 2m Hs sea states and deck spaces up to 190m² with 41-45 ton payloads. Multi-role designs enable crew transfer, offshore bunkering, and cargo operations from a single platform.

The company's service offering extends beyond crew transfer to include subsea survey support, fuel and water transfer, dive support, guard vessel supply, ROV support, marine consultancy, IMDG logistics, and bespoke vessel and equipment design — providing an integrated service proposition to offshore wind farm developers and operators. The company is certified to ISO 9001:2015 (quality), ISO 14001:2015 (environmental), and ISO 45001:2018 (occupational health and safety) under ISOQAR/UKAS accreditation, credentials that are typically prerequisites for tendering on major UK and European offshore wind contracts.

Mainprize generates revenue primarily through vessel charter services to offshore wind farm operators and renewable energy companies, supplemented by broader marine support services. The go-to-market is sales-led and direct, with customers engaging the company via its website and phone for vessel chartering and bespoke marine support work. Pricing is not publicly disclosed and is handled through contact-based quotations. The company operates as a founder/family-owned business with no disclosed institutional investors or parent company, and serves a regional UK market from its single Scarborough headquarters with no public global footprint claims.

Name

Mainprize Offshore

Legal name

Mainprize Offshore Ltd

Website

https://mainprizeoffshore.co.uk

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

11–50 employees

Short description

Mainprize Offshore Ltd is a privately held UK marine services company operating an 11-vessel fleet of crew transfer vessels and providing crew transfer, cargo, subsea survey, and marine support services to offshore wind farm operators, headquartered in Scarborough, North Yorkshire.

Ownership category

akta.pro rank

Product category

Offshore Marine Support Services

NAICS

Support Activities for Water Transportation (4883), Coastal and Great Lakes Passenger Transportation (483114), Ship Building and Repairing (336611)

SIC

Water Transportation (4400), Oil & Gas Field Services, Nec (1389)

akta.pro primary industry

Offshore Support & Marine Logistics Vessel Operators (PSV/AHTS) (TLADABAL)

akta.pro secondary industries

Crew Transfer & Workboat Services (Tug-Adjacent Operations) (TLAHAHAM), Offshore Wind & Renewable Support Vessel Construction (SOV, CTV, WTIV) (IMAJACAG)

Keywords

• Crew transfer vessels
• Offshore wind support
• Marine support services
• Subsea survey services
• Offshore vessel charter

Headquarters

HQ city

Scarborough

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Personnel, Operations, Marketing or Sales, Technology or R&D

Revenue model

1. Vessel Charter Services: Chartering of crew transfer vessels to offshore wind farm operators and renewable energy companies. Vessels are chartered with crew for personnel transfer, cargo operations, and support services.
2. Marine Support Services: Comprehensive offshore marine services including subsea survey, fuel and water transfer, dive support operations, guard vessel supply, ROV support, and marine consultancy.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Mainprize Offshore operates a fleet of 11 purpose-built crew transfer vessels (CTVs) chartered to offshore wind farm operators for personnel and cargo transfer, offshore bunkering, and marine support. The company also provides subsea survey, fuel and water transfer, dive support, guard vessel supply, ROV support, marine consultancy, IMDG logistics, and bespoke vessel and equipment design services to the offshore renewable energy sector.

Product overview

Mainprize Offshore Ltd operates a fleet of 11 purpose-built Crew Transfer Vessels (CTVs) for the offshore renewable energy sector. The company provides integrated services including personnel and cargo transfer, subsea survey, fuel and water transfer, dive support, guard vessel supply, ROV support, marine consultancy, IMDG logistics, and bespoke vessel and equipment design. The vessel portfolio spans two design lineages: the MO1 and MO2 built to Tecknicraft NZ designs with 155-164m2 deck areas and 34-45-ton payloads, and the MO3-MO11 built to Walker Marine Design UK specifications. The MO5 through MO8 represent the high-performance class capable of 2m Hs personnel transfers with 190m2 deck space and approximately 41-42.8-ton payloads, while the newer MO10 and MO11 offer 140m2 deck space with 30-ton payload capacity.

Differentiator

Problem solved

Functional benefit

Products and services

• MO1 Crew Transfer Vessel Fast crew transfer vessel designed by Tecknicraft NZ, capable of transferring personnel in 1.75m Hs significant wave height. Features a 155m² deck space and 34-ton payload capacity, performing crew transfer, offshore bunkering, and cargo operations for offshore wind farm operators.
• MO2 Crew Transfer Vessel Fast crew transfer vessel designed by Tecknicraft NZ, capable of transferring personnel in 1.75m Hs. Features a 164m² deck space and 45-ton payload, performing crew transfer, offshore bunkering, and cargo operations.
• MO3 Crew Transfer Vessel Fast crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 1.75m Hs. One of only a handful of vessels achieving this milestone in passenger transfer. Features 164m² deck space and 45-ton payload.
• MO4 Shallow Water Crew Transfer Vessel Shallow water all-purpose crew transfer vessel designed by Walker Marine Design UK, featuring minimal draft and weight-saving features for shallow water operations. Features 66m² deck space and 28-ton payload for heavy cargo transfers.
• MO5 High-Performance Crew Transfer Vessel High-performance crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 2m Hs significant wave height. One of only a handful of vessels achieving this milestone in passenger transfer. Features 190m² deck space and 42.8-ton payload.
• MO6 High-Performance Crew Transfer Vessel High-performance crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 2m Hs significant wave height. Features 190m² deck space and 41-ton payload for heavy cargo operations at offshore wind installations.
• MO7 High-Performance Crew Transfer Vessel High-performance crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 2m Hs significant wave height. Features 190m² deck space and 41-ton payload for heavy cargo operations at offshore wind installations.
• MO8 High-Performance Crew Transfer Vessel High-performance crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 2m Hs significant wave height. Features 190m² deck space and 41-ton payload for heavy cargo operations at offshore wind installations.
• MO9 High-Performance Crew Transfer Vessel High-performance crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 2m Hs significant wave height. Features 190m² deck space and 41-ton payload for heavy cargo operations at offshore wind installations.
• MO10 Crew Transfer Vessel Crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 2m Hs significant wave height. Features 140m² deck space and 30-ton payload for heavy cargo transfers at offshore wind installations.
• MO11 Crew Transfer Vessel Crew transfer vessel designed by Walker Marine Design UK, capable of transferring personnel in 2m Hs significant wave height. Features 140m² deck space and 30-ton payload for heavy cargo transfers at offshore wind installations.
• Marine Support Services Comprehensive offshore marine services for offshore wind farm and renewable energy operators, including subsea survey, fuel and water transfer, dive support operations, guard vessel supply, ROV support, and marine consultancy. Provided to enterprise customers in the offshore renewable energy sector.

Quantifiable outcome

• 12+ years of experience in renewable industry
• +2 more outcomes

Named customers1 record

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Two partnerships are on record, tiered core.

• Tecknicraft (New Zealand)coreStrategic or Co-development PartnerTecknicraft of New Zealand designed the MO1 and MO2 vessels. These vessels were designed and built to perform crew transfer, offshore bunkering, and cargo operations, featuring exceptional heavy cargo transfer capabilities.
• Walker Marine Design (UK)coreStrategic or Co-development PartnerWalker Marine Design of UK designed MO3 through MO11 vessels. These multi-role crew transfer vessels are optimized for offshore wind operations with capabilities for personnel transfer in 1.75m-2m Hs and heavy cargo operations.

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• High Speed Transfers (HST): Scottish-based CTV operator serving offshore wind clients in the UK and Europe. Directly comparable on crew transfer service model and target customer segment.
• Seacat Services: UK-headquartered CTV operator with a multi-vessel fleet supporting offshore wind O&M and construction. Directly overlaps Mainprize on service offering, customer base, and Northern European footprint.
• Tidal Transit: UK operator of CTVs purpose-built for offshore wind crew transfer. Directly comparable on vessel category and customer base, with overlap on North Sea deployments.
• Windcat Workboats: UK-based operator of one of the largest CTV fleets serving European offshore wind. Directly comparable to Mainprize in vessel category, target customer (wind farm developers), and operating geography.
• Edda Wind: Norwegian operator of purpose-built CTVs and SOVs serving European offshore wind. Comparable on vessel design philosophy and customer base, with a primary focus on the North Sea basin.
• Maritime Craft Services (MCS): UK-based operator of CTVs and small workboats supporting offshore wind and oil & gas. Directly comparable on vessel categories, customer base, and UK operating region.

Broad incumbents

• ESVAGT: Danish offshore service vessel operator with a large fleet of SOVs and CTVs. Overlaps with Mainprize on CTV services to offshore wind but at meaningfully greater scale and broader geographic reach.
• Vroon Offshore: Dutch offshore vessel operator with PSVs, AHTS, and CTVs. Overlaps with Mainprize on offshore wind CTV services, but operates a much broader and more diversified fleet across multiple offshore segments.
• North Star Renewables: Aberdeen-headquartered operator of SOVs and CTVs for offshore wind. Comparable on service category and target market, with broader service portfolio and significantly larger fleet.
• Bourbon: Global offshore vessel operator with a fleet spanning PSVs, AHTS, and CTVs serving offshore wind and oil & gas. Comparable on marine support services category, though with a far broader portfolio and international footprint.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/LtdOffshore
• Facebookfacebook.com/mainprizevessels
• LinkedInlinkedin.com/company/mainprize-offshore-ltd

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Mainprize Offshore