Symbrosia Secures $5.8M Series A‑1 to Scale Methane-Reducing Seaweed Feed for Sustainable Livestock
Symbrosia, a Hawai‘i‑based agricultural biotechnology company pioneering climate‑friendly livestock nutrition solutions, has continued to secure major funding to scale its innovative products and commercial operations. The company develops SeaGraze®, a red seaweed‑derived feed additive designed to drastically reduce methane emissions from ruminant animals like cattle and sheep, positioning itself as a key player in the nascent blue economy and sustainable agriculture sector.
In December 2025, Symbrosia announced an additional $5.8 million Series A‑1 funding round, following its earlier Series A, to accelerate the commercial scale‑up of its SeaGraze® and SeaGraze® Oil products and expand production capacity at its facility in Kailua‑Kona, Hawai‘i. The new financing features participation from strategic investors Idemitsu, a Japanese energy and materials company broadening its commitment to ocean‑based climate solutions, and One Small Planet, a climate‑focused venture fund that supports ecosystem‑scale innovations. Existing backers also joined the round, signaling ongoing confidence in the company’s growth trajectory.
Symbrosia’s funding history traces back to a $7 million Series A raised in 2022. That earlier round was led by Danone Manifesto Ventures, the corporate venture arm of global food and beverage leader Danone, which invests in companies developing sustainable food system innovations. Other participants in that round included Pacific6, HATCH, Presidio Ventures, Kamehameha Schools, and Mana Up, as well as local individual investors such as farmers and seaweed enthusiasts. The purpose of the 2022 capital was to scale Symbrosia’s production of high‑performing seaweed strains and bring its methane‑reducing feed additive to market in partnership with visionary brands and livestock producers.
Symbrosia was founded with a mission to tackle one of agriculture’s largest unsolved climate challenges: high methane emissions from livestock. Methane is a potent greenhouse gas, and enteric fermentation from cattle accounts for a significant share of global agricultural emissions. SeaGraze®, derived from Asparagopsis taxiformis, has been shown in trials to reduce methane emissions from livestock by more than 80%, offering a tangible pathway for ranchers and dairy producers to improve environmental performance while maintaining productivity.
The 2025 Series A‑1 funding will support expansion of SeaGraze® production beyond demonstration‑scale volumes, enhancing Symbrosia’s ability to meet growing demand from cattle operations prepared to adopt science‑backed nutritional strategies that support both animal health and sustainability goals. With expanded capacity, the company has increased production to supply feed for thousands of cattle and is preparing for a much larger expansion of capacity by 2026. Investors have highlighted confidence in Symbrosia’s proprietary cultivation and production methods as cost‑effective relative to competitors in a market that is rapidly attracting attention from producers, regulators, and brand partners alike.
Symbrosia’s approach combines advanced aquaculture with regenerative ocean farming practices. The company grows and processes its proprietary seaweed strains using a two‑phase cultivation process that begins with photobioreactors and culminates in open pond systems optimized for scale, enabling efficient production of bioactive seaweed material. This scalable model is a key differentiator as Symbrosia transitions from pilot‑scale demonstration to commercial‑scale manufacturing.
Beyond greenhouse gas reduction, SeaGraze® is rich in nutrients such as minerals, protein, and amino acids, which can support livestock gut health and nutrient absorption. This multi‑benefit profile strengthens Symbrosia’s value proposition to beef and dairy producers who are increasingly incentivized to adopt climate‑smart practices. The company’s work aligns with broader industry goals to decarbonize livestock supply chains, including commitments from partners such as Danone aiming for carbon neutrality across their value chains.
As Symbrosia scales, it is also planning significant infrastructure investments, including development of a larger seaweed production facility in Kona capable of serving millions of head of cattle annually. This expansion reflects growing commercial agreements with producers in the U.S. and Europe and positions Symbrosia to meet demand tied to sustainability‑linked market requirements that increasingly influence procurement decisions by global food and beverage brands.
Symbrosia’s combination of strategic funding from climate‑oriented investors, advanced cultivation technology, and an early mover position in methane‑reducing seaweed feed additives positions it as an influential innovator in sustainable livestock nutrition. With $5.8 million newly raised to propel commercialization, the company continues to attract capital that supports its ambitious goals of transforming livestock production for environmental and economic impact.
