# Seabound **Source:** https://geo.sig.ai/brands/seabound **Vertical:** Climate & Energy **Subcategory:** General **Tier:** Challenger **Website:** seabound.co **Last Updated:** 2026-04-14 ## Summary Maritime carbon capture startup using calcium oxide chemistry to capture ship exhaust CO2 as solid calcium carbonate for offloading; onboard retrofit technology for shipping decarbonization. ## Company Overview Seabound is a maritime carbon capture technology company developing systems that capture CO2 from ship exhaust directly onboard vessels, storing it as calcium carbonate for offloading at port — enabling the shipping industry to reduce emissions without switching to alternative fuels. Founded in 2021 and headquartered in London, Seabound has raised approximately $4.8 million in seed funding and is developing a post-combustion carbon capture approach that can retrofit onto existing ships without requiring engine replacements or fuel changes.\n\nSeabound's system works by diverting flue gas from a ship's engine exhaust through a reaction chamber containing calcium oxide (quicklime), which reacts with CO2 to form calcium carbonate — a solid, stable material that can be offloaded at port and sold as a feedstock for construction materials or industrial processes. This chemistry eliminates the need for compressed CO2 storage or cryogenic liquefaction, which are significant technical and safety challenges for onboard carbon capture. The calcium oxide can be regenerated at port facilities.\n\nIn 2025, Seabound operates in the emerging maritime decarbonization market where the International Maritime Organization (IMO) has established targets to cut shipping emissions 50% by 2050. Maritime shipping is responsible for approximately 2.5% of global CO2 emissions, and the sector faces growing regulatory pressure (EU ETS carbon pricing extending to shipping from 2024). Seabound competes with other maritime carbon capture startups and against alternative decarbonization approaches (ammonia fuel, hydrogen, LNG). The 2025 strategy focuses on completing pilot installations on commercial vessels, demonstrating the techno-economic case for operators, and partnering with port infrastructure providers for calcium oxide supply and calcium carbonate offtake. ## Frequently Asked Questions ### What is Seabound? Seabound is a UK-based carbon capture technology company founded in 2021 that develops onboard carbon capture systems for ships. The company traps CO₂ emissions and converts them into solid carbonate pebbles, achieving approximately 80% capture efficiency. ### What products and services does Seabound offer? Seabound offers onboard carbon capture systems that convert ship CO₂ emissions into carbonate pebbles with ~80% capture efficiency. Their services include container ship retrofits and integrated emissions capture solutions through their partnership with STAX Engineering. ### Who are Seabound's target customers? Seabound's target customers are shipowners and shipping companies operating container ships and commercial vessels. Current customers and partners include Lomar Shipping, Hapag-Lloyd, WWL, NYK, and various shipowners worldwide who have placed pre-orders. ### When was Seabound founded? Seabound was founded in 2021 and participated in Y Combinator's W22 batch. ### Where is Seabound based? Seabound is based in the United Kingdom. They are partnering with STAX Engineering on integrated solutions at the Port of Southampton. ### How much funding has Seabound raised? Seabound has raised $6.8M from investors including Lowercarbon Capital, Y Combinator, Eastern Pacific Shipping, and Collaborative Fund. The company has also secured £2.3M in UK Government grants, including £1.1M from the Clean Maritime Demonstration Competition Round 6 in August 2025. ### What are Seabound's key achievements? Seabound completed a world-first pilot with Lomar Shipping/Hapag-Lloyd, capturing CO₂ at ~80% efficiency onboard a 3200 TEU container ship. The company has secured pre-orders from shipowners worldwide and is launching trials with STAX Engineering in March 2025 servicing WWL/NYK customers. ### How does Seabound's carbon capture technology work? Seabound's onboard systems trap CO₂ emissions from ships and convert them into solid carbonate pebbles. The technology achieves approximately 80% carbon capture efficiency and can be retrofitted onto existing container ships. ### When will Seabound's commercial systems be available? Seabound plans to deliver their first commercial systems in H2 2025. They are launching trials with STAX Engineering in March 2025 and have already secured pre-orders from shipowners worldwide. ### What recent partnerships has Seabound announced? Seabound has partnered with STAX Engineering on integrated emissions capture solutions at the Port of Southampton. STAX Engineering has secured $70M in funding and will service WWL and NYK customers through trials beginning in March 2025. ## Tags energy, startup, b2b --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*