Seabound
Seabound builds modular onboard carbon capture systems for cargo ships that retrofit into 20-foot containers and convert CO2 into solid limestone pebbles using calcium looping. It serves shipowners, cargo owners, and ports seeking to reduce maritime emissions and comply with upcoming IMO carbon pricing.
- Company typePrivate
- Founded2021
- HeadquartersLondon, United Kingdom
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Seabound does
Seabound, founded in late 2021 in London by Alisha Fredriksson and Roujia Wen, develops modular onboard carbon capture systems for cargo ships that trap CO2 from vessel exhaust as solid calcium carbonate (limestone) pebbles. The core product, the Seabound Container, houses calcium looping technology in standard 20-foot shipping-container form factors that retrofit to existing vessels, capturing 25-95% of CO2 and up to 90% of sulphur emissions in a dual-purpose scrubber-and-capture configuration. A decoupled architecture moves regeneration and liquefaction off-vessel to land facilities, minimizing onboard equipment and CAPEX. The captured carbonate is offloaded at key ports for recycling, sequestration, or sale for industrial use (notably cement production at Heidelberg Materials' Brevik plant in Norway).
The company generates revenue through a combination of hardware sales or leasing of Seabound Containers and a planned usage-based fee of approximately $150 per tonne of captured CO2, positioned below the IMO's global carbon price of up to $380 per tonne from 2028. Customers include shipowners and operators (Hartmann Group, Lomar Shipping, Hapag-Lloyd, Wallenius Wilhelmsen, NYK Line), cargo owners and charterers (Heidelberg Materials), and ports (Associated British Ports via the PortZero project). Distribution combines direct enterprise sales to shipowners, co-development partnerships with technology firms (STAX Engineering) and industrial partners (thyssenkrupp Polysius for green lime supply), and pilot programs with shipping companies that serve as reference deployments.
Seabound has raised over £8.5 million in combined equity and grant funding since inception from Lowercarbon Capital, Y Combinator, Eastern Pacific Shipping, Collaborative Fund, Elemental Impact, the European Space Agency, and UK Government grants (Innovate UK, CMDC6). The company operates from a London headquarters and a Doncaster R&D facility ("Seabound North") with a team of 11-50 employees and is led by Co-Founder and CEO Alisha Fredriksson with Co-Founder Roujia Wen as advisor. Seabound has begun commercial deployment on the UBC Cork cement carrier in partnership with Hartmann Group, InterMaritime Shipmanagement, and Heidelberg Materials, and has stated an ambition to equip 1,000 ships by 2030 and capture 100 million tonnes of CO2 per year by 2040, equivalent to approximately 10% of global shipping emissions.
Seabound firmographics
Firmographics- Name
- Seabound
- Legal name
- Seabound
- Website
- https://seabound.co
- Company type
- Private
- Founded year
- 2021
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Seabound builds modular onboard carbon capture systems for cargo ships that retrofit into 20-foot containers and convert CO2 into solid limestone pebbles using calcium looping. It serves shipowners, cargo owners, and ports seeking to reduce maritime emissions and comply with upcoming IMO carbon pricing.
- Ownership category
- akta.pro rank
Seabound industry classification
Industry- Product category
- Maritime Carbon Capture Equipment
- NAICS
- Lime Manufacturing (32741), Boiler, Tank, and Shipping Container Manufacturing (3324)
- SIC
- Industrial Inorganic Chemicals (2810), Metal Shipping Barrels, Drums, Kegs & Pails (3412)
- akta.pro primary industry
- Calcium Looping & Carbonate-based Capture (High-temperature Sorbent Cycling) (EUABAGAG)
Keywords
Where Seabound is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices2 records
Markets served
Seabound business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Technology or R&D, Personnel, Operations, Supply Chain, Marketing or Sales
Revenue model
- Carbon Capture Equipment Sales/Leasing: Seabound designs, installs, and presumably sells or leases its modular carbon capture systems to shipowners. The company offers systems with low CAPEX and simple installation as a key selling point. Systems can be installed incrementally, allowing shipping companies to scale carbon capture capacity.
- Carbon Capture Service Fee: Seabound charges approximately $150 per tonne of captured CO2. The captured carbonate is offloaded at key ports with simple logistics, and CO2 can be sequestered or sold for industrial use (e.g., cement production, fuel production).
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Usage-based | Pay-as-you-go | Per-tonne carbon capture pricing |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels6 records
Seabound product offering
Product offeringCore offering
Seabound designs, manufactures, and installs modular onboard carbon capture systems for cargo ships, housed in 20-foot shipping-container-sized units. The systems use calcium looping technology with lime-based sorbent to chemically react with CO2 from ship exhaust, producing solid calcium carbonate (limestone) pebbles that are offloaded at ports. The dual-purpose units capture 25-95% of CO2 and up to 90% of sulphur emissions, and are retrofittable to existing vessels.
Product overview
Seabound offers a modular, retrofittable onboard carbon capture system called the Seabound Container for cargo ships, utilizing calcium looping technology that converts CO2 into solid limestone pebbles. The system captures 25-95% of a ship's CO2 emissions and also removes sulphur emissions, functioning as a dual-purpose scrubber and carbon capture unit. The core Seabound Container product comes in 20-foot shipping container form factors, with a second-generation version offering improved configurations. Seabound also provides a port-based emissions capture solution developed with STAX Engineering for capturing at-berth vessel emissions. The captured CO2 stored as carbonate pebbles can be offloaded at ports for sequestration or sale for industrial applications like cement production.
Differentiator
Problem solved
Functional benefit
Products and services
- Seabound Container A modular onboard carbon capture system housed in 20-foot shipping container-sized units that trap CO2 from ship engine exhaust using calcium looping technology, achieving 25-95% capture efficiency and also removing sulphur emissions. Retrofittable to existing vessels with low CAPEX, simple and compact design, and fast installation.
Quantifiable outcome
- Up to 95% CO2 capture efficiency achieved in full-scale systems
- +4 more outcomes
Companies that use Seabound
Customer profileNamed customers7 records
Segments3 records
Ideal customer profiles3 records
Seabound technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Seabound partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered core and major.
- thyssenkrupp PolysiuscoreNew partnership announced at Doncaster event to produce green lime for net-positive onboard carbon capture, enabling scalable and truly net-positive capture for global shipping. This partnership supports Seabound's goal of capturing 100 million tonnes of CO2 annually by 2040.
- Associated British Ports (ABP)majorPartnership for PortZero project at Port of Southampton to demonstrate portable carbon and emissions capture system. Funded by £1.1M UK Government CMDC6 grant, positioning Southampton as first UK port with integrated carbon and pollutant capture solutions from docked ships.
- STAX EngineeringcoreDemonstrated first-of-its-kind fully integrated emissions and carbon capture solution at Port of Long Beach servicing Wallenius Wilhelmsen vessels. STAX's mobile emissions control removes 99% PM and 95% NOx before Seabound captures up to 95% of carbon. Companies exploring international expansion including PortZero project at Southampton.
- Lomar Shipping / LomarlabscoreFirst customer providing Sounion Trader vessel for pilot carbon capture testing. Lomar's innovation arm lomarlabs facilitated world-first demonstration of onboard carbon capture technology aboard 3200 TEU container ship, achieving ~78% efficiency.
- Hapag-LloydmajorSupported Seabound's first pilot project while chartering the Sounion Trader vessel. Partnership enabled world-first demonstration of onboard carbon capture aboard commercial container vessel.
- Hartmann GroupmajorOwner of UBC Cork cement-carrying vessel selected for Seabound's first full-scale commercial carbon capture deployment. Partnership enables transition from pilot to commercial operation.
- InterMaritime ShipmanagementmajorShip manager for UBC Cork vessel managing Seabound's commercial carbon capture deployment.
- Heidelberg MaterialscoreGlobal cement leader chartering UBC Cork and providing pathway to Scope 3 emissions reductions. Captured CO2 will be utilized at Heidelberg's Brevik cement plant in Norway, world's first industrial-scale carbon capture plant in cement industry producing net-zero concrete.
- Wallenius Wilhelmsen (WWL)majorContainer ship from Wallenius Wilhelmsen serviced during STAX and Seabound's integrated emissions and carbon capture demonstration at Port of Long Beach.
Scale indicators9 records
Recent moves6 records
Expansion highlights7 records
Seabound competitors and assessment
Company assessmentDirect peers
- Value Maritime: Dutch maritime technology company developing modular carbon capture modules (Filtree system) that retrofit onto ship exhaust to capture CO2. Closest direct competitor to Seabound with comparable vessel-side CCS modules and a similar European shipping customer base.
- STAX Engineering: California-based company providing mobile emissions capture systems for ships at berth, removing particulate matter, NOx, sulphur, and CO2. Already a strategic partner of Seabound for the integrated PortZero/Long Beach solution; competes in adjacent port-based CCS rather than onboard capture.
Broad incumbents
- Wärtsilä: Finnish marine technology and engine manufacturer with significant R&D in marine decarbonization, including CCS-compatible engines and future fuel platforms. Competes indirectly with Seabound via alternative decarbonization pathways and a broader marine equipment portfolio.
- Alfa Laval: Swedish marine equipment manufacturer offering scrubbers, heat exchangers, and emissions control systems including fuel cell modules. Broad incumbent with overlapping environmental control technology for ships and well-established shipyard relationships.
- Mitsubishi Heavy Industries: Japanese conglomerate with active research and pilot programs in onboard carbon capture for ships through its shipbuilding and CCS divisions. Well-capitalized engineering incumbent that could commercialize maritime CCS at scale if it chose to focus there.
- Langh Tech: Finnish marine scrubber manufacturer (part of Langh Group) expanding from SOx scrubbers into carbon capture and emissions reduction for ships. Direct adjacent competitor in vessel emissions control technology with shared regulatory drivers.
- Climeworks: Swiss direct air capture leader and one of the most capitalized carbon removal companies. Competes for the same climate capital and CO2 utilization customers (e.g., Heidelberg) as Seabound, though addresses atmospheric capture rather than shipboard point-source capture.
- 1PointFive (Occidental): Occidental subsidiary commercializing the Stratos direct air capture facility and large-scale CO2 sequestration infrastructure. Competes for the same carbon removal value chain customers and end-use markets as Seabound, though currently focused on DAC rather than onboard CCS.
Emerging players
- Heirloom Carbon Technologies: US-based DAC company using limestone-based DAC technology with CO2 sequestration partnerships. Uses similar calcium-based chemistry to Seabound but applies it to direct air capture rather than shipboard point-source capture; potential competitor for CO2 offtake customers.
- BAR Technologies: UK-based marine engineering firm developing WindWings wind-assisted propulsion for cargo ships as an alternative decarbonization pathway. Competes for the same shipowner decarbonization budget but via fuel-saving technology rather than exhaust capture.
Market position
Strengths4 records
Weaknesses5 records
Competitive moat6 records
Key risks7 records
Key highlights7 records
Customer concentration
Seabound social profiles
Digital presenceSeabound financial estimates
Financial estimateRevenue estimate
Valuation estimate
Seabound leadership team
Management profileNumber of profiles
Profiles9 records
Seabound funding detail
Funding detailFunding overview
Funding rounds6 records
Investors17 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Seabound M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Seabound
What does Seabound do?
Seabound designs, manufactures, and installs modular onboard carbon capture systems for cargo ships, housed in 20-foot shipping-container-sized units. The systems use calcium looping technology with lime-based sorbent to chemically react with CO2 from ship exhaust, producing solid calcium carbonate (limestone) pebbles that are offloaded at ports. The dual-purpose units capture 25-95% of CO2 and up to 90% of sulphur emissions, and are retrofittable to existing vessels.
Is Seabound a public or private company?
Seabound is a private company. It is classified as venture growth investor backed and is currently operating.
When was Seabound founded?
Seabound was founded in 2021. It employs 11 to 50 people.
Where is Seabound based?
Seabound is headquartered in London, United Kingdom, in the Europe region.
How does Seabound make money?
Two revenue lines are on record. Carbon Capture Equipment Sales/Leasing is the primary driver. The others are carbon Capture Service Fee.
Who are Seabound's main competitors?
Direct peers on record are Value Maritime and STAX Engineering. Broad incumbents are Wärtsilä, Alfa Laval, Mitsubishi Heavy Industries, Langh Tech, Climeworks and 1PointFive (Occidental). Emerging players are Heirloom Carbon Technologies and BAR Technologies.
Does Seabound have an API?
No public API is recorded for Seabound.
What industry is Seabound in?
Seabound's product category is Maritime Carbon Capture Equipment. Its primary akta.pro industry code is EUABAGAG, Calcium Looping & Carbonate-based Capture (High-temperature Sorbent Cycling). Its NAICS code is 32741 and its SIC code is 2810.