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The oceans' fastest-growing organism is also one of the planet's greatest carbon sinks.

Up to 40 cm
of growth every day, the fastest-growing organism in the sea.
3x
harvests a year from the same holdfast, instead of once every four or five years for most wild seaweed.
45%
EBITDA margin we target by processing two to six products from one harvest, near-zero waste.
30x carbon
Wild kelp fixes carbon at 20x the rate of forest — our depth-cycling method pushes that past 30x.
Why Big Kelp

Big Kelp, Giant Potential

Huge amounts of consented water are already available to grow giant kelp in our catchment area in New Zealand. We have 480 ha on the table already.

This represents a major opportunity for local aquaculture, notably mussel farms, to use the same crews, boats and rigging to grow a new crop of kelp alongside their existing crop of mussels. This improves the health of the water and adds 3 extra harvests per year to their existing 2-year harvest cycle.

Mussel farmers and other aquaculture, apply here

How we put it to work

One crop, four product categories, zero waste.

$2.9bn market

Organic Bio-Stimulant

Certified-organic tonic sprayed on vines and other crops to boost growth and resilience to heat, drought, flood, and transplant shock.

Sells year one · 44% of terminal revenue
$2.1bn market

KelpPods.com

Biodegradable, plantable pots pressed from fertilising kelp fibre instead of plastic — they break down in the soil as the plant or tree grows.

Sells year one · 20% of terminal revenue
$1.98bn market

Alginates

The gel ingredient in ice cream, pills, dressings and a thousand other products worldwide — we farm at 10x the rate of wild harvest, in clean water.

Deferred to post break-even year two · 14% of terminal revenue
~10x bulk value

Marine Actives

High-value compounds incl. phlorotannins and fucosterol, for skincare antioxidants and nutraceutical supplements.

Deferred to post break-even year two · 22% of terminal revenue

Additional ‘bonus’ revenue of under 4% is available from the sale of insured, verified, audited carbon offsets. Apply here to make your company carbon neutral.

Speak to our team about partnership or supply →
The case for kelp

Every product replaces something more damaging.

Carbon locked in faster than a forest — and unlike a forest, it doesn't burn down. Farms sited where nothing currently grows, so marine life only gains.

A better fertiliser

Our bio-stimulant helps reduce use of synthetic fertiliser. Every ton of Haber-Bosch nitrate produced emits up to 7 tons of CO₂. Ours is carbon negative, increases nitrate uptake in crops and won’t kill wildflowers, bees and fish from run-off. It even enhances soil health, wind and flood resistance.

Net gain for biodiversity

Kelp farms are sited where nothing grows. Fish and invertebrates breed more, water clarity and acidity improve locally, with no need to compete for agricultural land or coastal kelp fields – our kelp floats.

Displacement, not just storage

89% of our carbon benefit comes from displacing dredged kelp, synthetic fertiliser and plastic plant pots — a permanent reduction.

Helps neighbouring farms too

Grown alongside salmon cages, giant kelp reduces nitrogen in the water and adds oxygen and shade that can help prevent summer heat-driven oxygen crashes. Not to mention the extra revenue from harvests.

The moonshot

Wild kelp already fixes carbon at 20× the rate of a forest. Our depth-cycling method pushes that past 30× — with none of a forest's fire, drought or deforestation risk. At scale this will make a major impact on climate change.

Backed by serious science

Big Kelp London Lab

Our team of scientists will devote their time, and grant money, to advancing the next generation of bio-degradable plastics, bio-materials and products. Giant kelp biomass is cheap, plentiful and has huge potential to shift the world away from fossil-fuel-based products.

For engineering we work alongside researchers at Imperial College London's hydrodynamics department, testing our farming racks in wave-tank facilities under the roughest sea conditions before they ever go into open water.

The next frontier: autonomous, self-cycling racks that farm the open ocean — a method independently validated in Maine and off Catalina Island, California.

Meet our research partners →
Cawthron Institute Earth Sciences New Zealand — Te Whatu Ao Imperial College London
The team · in the order they join

The people behind the revolution.

Year one
James Carter-Johnson
Founder & CEO · MA, MBA

A gifted communicator and manager with 10 years’ experience in global partnership development, fundraising, stakeholder management and communications. James has produced film and TV across three continents and was a key player at ScreenHits TV, a successful streaming start-up with international reach. Climate solutions have been an obsession for 20 years, since his first climate documentary in Madagascar.

Year one
Peter Rivera
VP Bio-Technology · MSc, PhD

Developed applied biotechnological solutions from marine systems, from algal cultivation to sustainable bioproduct research and development. Led interdisciplinary projects advancing seaweed-based bioproducts, bio-acrylic acid production and aquaculture waste valorisation, in many international collaborations. Has both the kelp farming and processing chops to get Big Kelp off to a running start.

Year one
Confirmed for launch
SVP Project Management · BSc, MSc

A talented and adventurous marine biologist whose background is in fish, shrimp and kelp farming. Their dissertation was on land-based seaweed aquaculture, and they currently work on the biggest seaweed project of its kind domestically. Their role will be to set up and oversee new aquaculture projects. Living in New Zealand means valuable local knowledge.

Year one
Vincent Doumeizel
Board Advisor · New Markets

‘The Kelp Father’ and pre-eminent global seaweed generalist and futurist, author of the definitive book on seaweed futures, The Seaweed Revolution. His friends, contacts and influence span the world. He is a United Nations advisor and a known quantity at almost every global seaweed conference, and has already proved an excellent advocate and strategic advisor.

Year one
Prof. Carole Llewellyn
Board Advisor · MSc, PhD

Carole has been working with algae for decades and is seen as a leading expert globally. She has led large EU and international multidisciplinary projects on algal biotechnology (over €12M EU funding), has 80+ publications (h-index 45) and expertise in algal cultivation, extraction, product development and biorefining. She also mixes a mean Erlenmeyer flask.

The New Zealand team · operations to launch April 2027

Year one. Six roles, hired locally, before the first line goes in the water.

Year one
Robert Stack
Site Foreman · BCom, SIT2LRN, HACCP

Hires and runs the local crew, holds the day-to-day on site and reports to the CEO. Previously operations and site manager at large aquaculture companies CH4 and Maclab.

Year one
Huia Webby
Hatchery & Nursery Technician · BSc, MSc

Runs the in-house nursery, takes delivery of Macrocystis seed stock, and seeds the lines. Trained alongside the hatchery supplying Cawthron Institute before the season starts. Previously a lab technician at CH4.

Year one
Willie Houia
Head Wet Line Technician

Runs the wet line — no drying, no heat. Receives fresh biomass, presses, separates and drums the concentrate, and keeps the batch records the certifications need. Previously worked in senior roles across forestry, viticulture and aquaculture.

Year one
Paul Smith
Press Harvester & Rack Fabricator · ME, CPEngsmithengineering.co.nz ↗

Manufactures the wet lines and rack harvester. Assembles the first limited run of racks and winch buoys from delivered components, and repairs them between cycles. Intermittent contracted work. Has engineered for MacLab, Waimana and MFA.

Year one
Andy Robertson
Marine Operations Manager

Vessel handling, mooring and rack deployment. Holds the tickets, runs the deployment and recovery, and owns safety on the water. Harvest and deployment is intermittent and Andy has a workshop adjoined to our warehouse, so this is multi-role.

Year one Aquaculture Technician

Deploys and monitors the seeded lines, records growth, depth and condition, and gathers the season-one evidence the whole yield case rests on. Harvest, maintenance and deployment is intermittent, so part time or multi-role.

NZ science advisers
Cawthron Institute, NelsonSeed stock and hatchery training.
Paul South, PhDHead of Algae.
Cecilia Biancacci, PhDSeaweed aquaculture scientist.
Roberta D’Archino, PhDNZ Earth Sciences.
The team · in the order they join

The bench, and when it arrives.

Year one
Luke Muscutt
VP Engineering · MEng, PhD

Pioneering engineer and bio-mechanist. PhD on plesiosaur hydrodynamics; built the FLIP robot for the BBC with David Attenborough. Now at Imperial College mechanical engineering. Big Kelp has a partnership with Imperial College to battle climate change and coastal erosion at vast scale using its unique tech. Multiple grant applications pending.

Post year two / grant
Confirmed, to be announced
Chief Science Officer · MSc, PhD

Over a decade’s expertise in bio-refinery developing and optimising scalable extraction and purification processes for seaweed-based bioactive compounds, notably alginates from kelp at BioMara, integrating mariculture, biodiesel, livestock and agricultural industries into a seaweed-based biorefinery model.

Post year two breakeven
James Sainty
Chief Finance & Strategy Officer · BA, MBA

A brilliant strategist and financial analyst, James led a team at Emitwise helping some of the biggest companies in the world decarbonise. 15 years of Fortune 500 decarbonisation strategy (Accenture, McKinsey clients); expertise in market entry and corporate partnerships.

Post year two breakeven
Akthar Swaebe
Chief Commercial Officer · BT, MSc, MBA

A consummate salesperson and a subject expert in exactly the markets we intend to lead. Heads marketing and direct sales strategy and execution. A prolific lead creator and negotiator. He already sells exactly what we will sell – except our products will be cheaper, greener and more plentiful.

Post year two / grant
Confirmed, to be announced
SVP Materials & Carbon · BSc, MSc, PhD

Pioneering chemist and materials scientist specialising in the building blocks of algae used for bio-plastics, nano materials and hydrogels, and in carbon capture modelling. Pending grant funding or substantial profits, they will lead Big Kelp up the value chain in novel uses of algae-based bioplastics, both algin-based feedstock and fermentation to PHA.

The bottom line

Be a part of the algae revolution.

We're not asking anyone to choose between a good return and a good outcome for the planet. Clever use of giant kelp gives you both.

Big Kelp is raising a £7 million round — £4m equity, £3m debt — with £3m of equity closing now at a £12m pre-money valuation, with HMRC advance assurance for SEIS and EIS relief for UK taxpayers.

Request the investor deck → Get in touch
01

A 45% EBITDA margin from processing two to six products from the same harvest, near-zero waste.

02

The fastest-growing crop in the sea, harvested three times a year instead of once every four or five.

03

Our own depth-cycling racks yield 2.3x more per hectare than a surface canopy — our own IP.

04

A SEIS/EIS pathway that makes early UK investment particularly tax-efficient.