About
Seabound builds modular onboard carbon-capture equipment for ships, targeting shipowners and operators seeking to reduce emissions and comply with maritime regulations. Its system captures CO₂ and sulphur from engine exhaust, locking CO₂ into solid carbonate pebbles in a compact, retrofittable design.
Market
Seabound competes in maritime onboard carbon capture and storage, particularly the retrofit market for existing commercial vessels. Its positioning is a compact, purpose-built shipboard system that captures a configurable 25–95% of CO₂ and stores it as solid carbonate pebbles that can be offloaded at ports, rather than requiring the ship to handle gaseous CO₂. Its calcium-looping approach also captures sulfur emissions and combines carbon capture with scrubber functionality, while its low-CAPEX, fast-installation, automated, and remotely monitored design differentiates it from other marine OCCS offerings.
Seabound primarily targets commercial shipowners, ship managers, and fleet operators seeking to retrofit existing vessels and reduce emissions without waiting for alternative fuels. It also serves cargo owners and charterers with supply-chain or Scope 3 decarbonization obligations, as illustrated by the Heidelberg Materials cement-shipping deployment.
At a Glance
Problem
Seabound addresses shipping’s hard-to-abate greenhouse-gas emissions problem. Shipowners face pressure from regulation, customers, and shareholders, while future fuels such as hydrogen and ammonia remain years away and efficiency measures are insufficient. The industry produces approximately 3% of global greenhouse-gas emissions, creating a particularly urgent problem for operators of existing vessels that cannot wait for new propulsion technologies.
The economic pain is both regulatory and operational: conventional onboard carbon-capture approaches can require up to $30 million in capital expenditure, substantial space and energy, and difficult port infrastructure for handling liquefied CO₂. Seabound’s primary use case is therefore retrofitting existing commercial ships—especially large container vessels—with a comparatively compact system that can cut emissions now while shipowners manage rising carbon costs and tightening environmental requirements.
Product / Service
Seabound provides a retrofittable, modular onboard carbon-capture system that is designed and installed to fit each ship. Its equipment sits near the ship’s funnel and uses calcium looping: exhaust gas reacts with calcium oxide to form solid, inert calcium-carbonate or limestone pebbles. The company says its systems can be configured to capture between 25% and 95% of CO₂, while also removing sulphur emissions; an early container-ship pilot captured roughly 80% of CO₂ and about 90% of sulphur.
The captured material is stored as easy-to-handle solids rather than pure gaseous or liquefied CO₂, then offloaded in port for shore-based processing. That process can regenerate the calcium material for reuse and produce a pure CO₂ stream for utilization or storage. Seabound’s delivery proposition is a simple, compact, low-CAPEX installation using modular units sized like 20-foot shipping containers, with the company and its partners claiming materially lower capture and carbon-transport costs than conventional approaches.
Market
Seabound competes in maritime decarbonization, specifically the market for onboard carbon-capture equipment for existing ships. A named comparable is Value Maritime, which has also been developing onboard carbon-capture systems. Scrubbers are an adjacent incumbent technology rather than a direct equivalent: they primarily remove sulphur, whereas Seabound’s system is designed to capture both CO₂ and sulphur. Longer-term alternatives include future fuels, electrification, efficiency measures, and slow steaming, but the available evidence presents these as insufficient, immature, or transitional relative to the immediate retrofit opportunity.
Seabound has moved beyond laboratory development but remains an early-stage commercial technology company. By February 2026 it had completed two world-first pilot projects, including work with Lomar Shipping, lomarlabs, Hapag-Lloyd, STAX Engineering, and Wallenius Wilhelmsen; raised more than £8.5 million in combined equity and grant funding; and completed its first full-scale modular units. The company says it has transitioned from pilots to commercial deployment, although the available evidence does not report revenue figures, so it cannot be definitively labeled either revenue-generating or pre-revenue from this record alone.
Founders & Leadership
Funding History
Undisclosed
Undisclosed
Y Combinator
Lowercarbon Capital
Undisclosed
Collab Fund
Government of the United Kingdom
European Space Agency
Recent News
Seabound announced completion of its first full-scale maritime carbon capture systems, a new partnership with the European Space Agency backed by €1.5 million in funding, and a partnership with thyssenkrupp Polysius to produce green lime. The company also unveiled its second-generation Seabound Containers and said it was moving from pilot projects toward commercial deployment.
Seabound secured a £1.1 million UK Government grant for the PortZero project at the Port of Southampton. The project integrates Seabound’s carbon-capture technology with STAX Engineering’s emissions-capture barge, in a consortium that also includes Associated British Ports and Lomar Shipping.
STAX Engineering announced that it was participating in a Seabound-led consortium awarded £1.1 million through the UK Department for Transport’s Clean Maritime Demonstration Competition. The PortZero demonstration combines STAX’s mobile emissions-capture barge with Seabound’s carbon-capture system and is scheduled to debut at Associated British Ports’ Southampton port with Lomar vessels.
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Get notified when they postBusiness Model
Seabound’s commercial model centers on selling and installing its carbon-capture systems for ships. The company has also used pilot projects, equity, and grant funding to develop and commercialize the technology.