Gigablue has raised $20 million in the first close of its Series A financing round to scale its ocean-based carbon dioxide removal solution. The funding will be used to expand deployment of the company’s marine technology, which is designed to capture atmospheric carbon and store it in the deep ocean through enhanced natural processes.

Founded in 2022, Gigablue focuses on ocean health and climate solutions that leverage the ocean’s existing capacity to absorb carbon. Its approach is based on a method known as Microalgae Carbon Fixation Sinking, which builds on the natural biological carbon pump.

Enhancing the Ocean’s Natural Carbon Sink

Gigablue’s system deploys substrates made from naturally occurring compounds that support the growth of photosynthetic phytoplankton. These microorganisms absorb carbon dioxide from the atmosphere and convert it into biomass. Once formed, the biomass sinks to deep ocean layers, effectively sequestering carbon for long durations.

The company says its approach amplifies the ocean’s natural sequestration processes by up to two orders of magnitude, increasing the efficiency of carbon capture while working within existing marine systems rather than introducing synthetic capture mechanisms.

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Measurement and Environmental Integrity

A central challenge for ocean-based carbon removal is credibility and verification. Gigablue positions measurement and transparency as core elements of its model. Each deployment is supported by a comprehensive Measurement, Monitoring, Reporting and Verification framework that combines in-situ oceanographic measurements, environmental DNA sampling, water chemistry analysis, and custom deep-sea monitoring tools.

According to the company, this integrated monitoring approach is intended to ensure that carbon removal outcomes are measurable, verifiable, and environmentally responsible, addressing concerns around permanence, leakage, and ecological impact that have limited confidence in some marine carbon removal concepts.

Investor Backing and Market Context

The Series A first close was led by Planet Ocean Capital, reflecting growing investor interest in ocean-based climate solutions. Gigablue said the financing signals increasing recognition that high-integrity carbon removal will be necessary alongside aggressive emissions reductions to meet global climate targets.

Company leadership emphasized that marine carbon removal can play a meaningful role in net-zero strategies when grounded in scientific rigor, transparency, and strong environmental safeguards. They also highlighted the potential for such approaches to deliver co-benefits for ocean health if deployed responsibly.

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Next Steps and Scaling Plans

Gigablue said it is now working toward a second close of the Series A round as it continues to scale its technology and deployment capacity. As global demand for durable carbon removal grows, particularly from corporates and governments seeking to address residual emissions, the company aims to position its ocean-based solution as a credible and scalable option within the broader carbon removal landscape.

The progress of Gigablue’s technology will be closely watched by policymakers, scientists, and investors as debates continue over the role of the ocean in long-term climate mitigation and the standards required to ensure integrity in emerging carbon removal markets.

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