Seaweed Rising:Europe’s Untapped Blue Bioeconomy

Executive Summary

• The European seaweed sector is at a pivotal stage. While oceans offer an untapped resource for sustainable, valuable, and scalable production, local supply is limited: Europe produces just 0.8% of global seaweed, mostly artisanal. Scaling the upstream segment – nursery, seeding, cultivation, and harvesting – is essential to meet growing demand, which could reach €9 billion by 2030.

• Venture activity shows the sector’s early promise. Since 2007, 72 upstream companies have raised €234 million globally across 153 deals, mostly in small, early-stage rounds, highlighting strong interest in pioneering ventures despite limited follow-on funding.

• Funding is heavily reliant on non-traditional sources – grants, angels, and public programs – and repeat investors are rare. The largest deals have gone to integrated players that combine cultivation with processing, while pure farming ventures struggle to attract growth capital. Structural challenges include high capex, low production volumes, fragmented supply chains, and limited offtake agreements.

• Early consolidation and industrial-scale farms are beginning to emerge, creating conditions for institutional and venture capital. First-movers can secure prime coastal sites, build regulatory expertise, and lock in corporate partnerships. Investors who back scalable, defensible models now can capture significant value while shaping the European seaweed bioeconomy.

The Opportunity

Transitioning to a circular bioeconomy is central to achieving Europe’s climate goals. Getting there will require sustainable feedstocks that don’t interfere with food production or biodiversity. But competition for resources is intense: half of the world’s habitable land is used for agriculture, fuelling strong competition for space and difficult trade-offs.

A historic underuse of our oceans has intensified this pressure on terrestrial systems. Fortunately, this is changing, with growing attention on aquaculture as an alternative source of sustainable biomass. One of the most promising untapped resources is seaweed.

Seaweed has many attractive qualities:

• Sustainable. Unlike land-based agriculture, it doesn’t require freshwater, fertilizer , or pesticides which makes it a less carbon-intensive alternative biomass. It also captures five times more CO2 than most land crops and reduces pollution by absorbing nutrients from the water – a process known as ‘bioremediation’.

• Valuable. Seaweed can be used in a wide range of products. It’s edible, making it suitable for food and dietary supplements. It can be processed into fertilizer or turned into biochemicals for pharmaceuticals, cosmetics, and industrial applications. Seaweed also has uses in packaging, biofuels, and animal feed.

• Scalable. Seaweed can be cultivated in vast areas of the ocean, which are currently underused. With the right infrastructure and management, production could reach billions of tons annually, supporting global supply chains.

Europe is uniquely suited for seaweed production for several reasons:

• Fertile growing environment. The region’s cold and nutrient rich waters are well suited to grow seaweed. In particular, the North Sea corridor between Norway, the UK, and the Netherlands has exceptional biophysical conditions, including ideal salinity, temperature, and species richness.

• High-value products. European producers are well-placed to differentiate with ‘clean’, traceable, and certified products, offering higher-margin opportunities compared to mass-market production.

• Strong local demand. Corporates across food, packaging, cosmetics, and chemicals are actively scouting partnerships and sourcing opportunities as they seek to decarbonize their supply chains. This signals strong future offtake potential once scalable supply is available.

• Supportive policy environment. Growing attention to the blue bioeconomy and biodiversity is creating favorable frameworks, including initiatives such as the EU Roadmap Towards Nature Credits, which could establish new revenue streams for ecosystem services.

European demand for seaweed could reach up to €9 billion by 2030, according to Seaweed for Europe. Drivers include a rapidly growing biostimulant market, advanced innovation in the biorefineries that turn seaweed into other products, and a push to restore oceans and coastlines.

But local production lags significantly behind other regions. Europe grows just 0.8% of seaweed globally, compared to 97% in Asia. Most of it is harvested from the wild, rather than farmed, and has been plateauing for the last two decades.

“It’s all about scale,” says Kim Kristensen, founder and CEO of Arctic Seaweed. “A typical analysis for us is 100 tons would cost you about €3 a kilo to produce. If you go to 10,000 tons, we’re about €0.40. At 100,000 tons, we believe we’re at €0.15.”

Despite Asia’s dominance in production, it lags behind in environmental assessment and sustainability research, producing just 25% of life-cycle assessment (LCA) studies, according to researchers at Aarhus University. Europe accounts for roughly 70%, indicating that the region is playing a leading role in building the evidence base on the environmental impacts and benefits of seaweed production.

Source: Global Seaweed Coalition

To meet growing demand and reach industrial scale, Europe needs to develop the upstream segment of the seaweed value chain: nursery, seeding, cultivation, and harvesting. It currently makes up just 4% of the region’s production, according to the European Infrastructure Bank. The market is also artisanal and fragmented: there are 75 farms in 11 countries, most of which are at a nascent stage, per the Global Seaweed Coalition.

What they’re missing is the capital to fund their growth.

Venture Dynamics

An analysis of recent investment patterns reveals the emerging opportunity for venture capital in European seaweed.

We have identified 72 upstream seaweed companies that have raised funds globally since 2007. They have done 153 deals, raising a total of €234 million. One of the most notable companies is Norway’s Alginor, which is responsible for three of the biggest rounds, the largest of which was a €34 million fundraise in 2024.

European seaweed fundraising can be divided into three distinct time periods:

• 2014-2016: Norway and other parts of Northern Europe expanded the number of licenses and farming areas dedicated to seaweed cultivation, driving a wave of new ventures focused on offshore kelp production. In 2014, 54 licenses for kelp farming were issued. By 2021, the number was 520.

• 2020-21: Venture investment in climate and ocean tech surged, amid a broader spike in VC deals. Seaweed startups attracted significant capital by positioning themselves as a climate mitigation and biodiversity solution.

• Post-2021: Activity decreased but stabilized at a higher baseline, following a shift from artisanal growth to capital-intensive, tech-driven ventures.

There are three important trends in the fundraising data:

1. Early-stage focus. Many small rounds show that investor interest is growing, but it’s concentrated in the earliest stages as regulations mature, infrastructure is built, and models are proven.

2. Deal concentration. The largest funding rounds have gone to integrated players that collect and process seaweed. For example, Sea6 Energy raised about €30 million with its ‘farm to factory’ approach, which combines mechanized farming and biorefineries. This contrasts with pure cultivation plays, which struggle to raise growth capital without downstream revenue.

3. Limited repeat backing. Of the 193 investors identified, only a tiny handful invest more than once. Funding comes mostly from non-traditional capital (grants, angel investors, public programs). Strategic corporate investors are rare. Notable examples include BASF, Borregaard, Colruyt, and Nissui.

This reflects an immature but emerging market that hasn’t yet attracted sustained venture capital. That presents a structural problem. Non-traditional funders seed early stages, but rarely offer follow-on financing for €10 million-plus growth rounds. Without that scale of funding, the industry can’t build the infrastructure it needs to grow.

There are a number of reasons why mainstream VC has stayed away from European seaweed. They include:

• Fragmented supply chains. Scaling requires heavy capex in mechanization, processing infrastructure, and logistics, so investors must be prepared for long holding periods.

• Low production volumes. There is a risk of backing companies prematurely, before supply chains and end markets mature. Technology innovations can help decrease production costs and increase yields of seaweed farms.

• Limited offtake agreements. Weak demand visibility and the absence of long-term contracts create uncertainty for scaling.

However, early signs of consolidation are beginning to emerge, creating the scale that attracts institutional capital. For example:

• The Seaweed Company acquired Dutch seaweed cultivator Zeewaar in 2021. The company was looking to strengthen its position in the European ‘blue food’ market by integrating a pioneer organic seaweed farm.

• Sapec Portugal acquired a 57% stake in marine algae producer ALGAplus in 2022. This was a strategic deal to strengthen Sapec’s market presence in organic aquaculture and pivot into sustainable food and cosmetics industries.

• Ocean Rainforest acquired a 60% stake in Alamarsa, the Mexico-based owner of the Algamar brand, in 2025. The company is now able to produce seaweed-based biostimulants in California, the Faroe Islands, and Mexico, serving the US, European, and Mexican markets.

Ocean Rainforest’s CEO is optimistic about the direction of the industry.

“We have to attract good people with an innovative spirit to come up with the technical solutions we need,” says Ólavur Gregersen. “You can only do that if you demonstrate that there is an industry, and there is an industry forming.”

Recent developments show further milestones as the sector matures:

• July 2025: Initial harvest at the world’s first commercial-scale seaweed farm off the Dutch coast.

• March 2025: European Infrastructure Bank publishes a report on scaling the region’s seaweed industry. It identifies regulatory inertia as a barrier to unlocking debt financing for aquaculture models.

• January 2025: Seaweed producer CH4 Global begins production of its new EcoPark, the world’s first commercial-scale Asparagopsis farming facility.

That momentum is clear to Adrien Vincent, programme director at Seaweed for Europe.

“We are regularly contacted by people from startup studios who see seaweed as a very promising area and want to explore what could be developed in this space,” he says.

Slowly but surely, the infrastructure is being built. The sector is crossing from ‘too early’ to ‘just right’ for growth capital.

Why Now?

The European seaweed sector is at an inflection point. Farms and processing facilities are expanding, regulatory frameworks are stabilizing, and partnerships are starting to form.

First-movers are set to enjoy three important advantages:

1. Prime coastal concessions. Early entrants can secure the best seaweed farming sites with optimal growth conditions, giving them a head start on production and scale.

2. Regulatory expertise. First-movers develop experience navigating complex EU and national rules, reducing compliance risk and speeding up expansion.

3. Corporate partnerships. Early companies can lock in relationships with large food, fertilizer, and bioproduct firms, ensuring demand and long-term offtake agreements. For example, Unilever has already invested millions in using seaweed to create self-cleaning surfaces, and in June 2025 the company signed a Seaweed for Europe manifesto alongside other major corporations, including Danone.

“There’s a clear interest from corporates to use seaweed biomass in order to reduce their carbon footprint,” says Gregersen. “They just don’t know exactly how to do it. And that is the challenge for us as entrepreneurs: to break that wall.”

The window is opening. Investors who back innovative early entrants with site advantages, defensible technology and scalable models have the opportunity to capture significant value and shape the future of the seaweed bioeconomy.

Through our focus on the European circular bioeconomy, we want to support companies building in this emerging market, helping unlock the economic potential of nature-based solutions whilst creating value for investors and the environment.

Whether you’re building upstream seaweed infrastructure, seeking co-investment partners with deep sector knowledge, or exploring opportunities in the blue bioeconomy, please get in touch. We’d like to hear from you.