Circe Bioscience Inc.

Founded in 2021 and based in Massachusetts, US, Circe Bioscience Inc. is a bioproduction technology company that provides gas fermentation processes to transform carbon dioxide, water, and waste into organic products to reduce carbon footprint in production. Shannon Nangle (CEO) and Ciaran Dunn are the co-founders of the company. In September 2024, Circe Biosciences Inc.

raised USD 5 million in seed funding from ReGen Ventures, including Undeterred Capital, Ponderosa Ventures, Bee Partners, Exceptional Ventures, Climate Capital, and Safar Partners. Circe is a manufacturing technology company leveraging gas fermentation to create sustainable, carbon-negative molecules for industrial applications. By converting CO₂ emissions into high-value products, Circe provides a scalable solution to enhance supply chain stability while addressing environmental challenges. The firm's proprietary aerobic gas fermentation process transforms point-source CO₂ emissions into industry-agnostic molecules.

This approach enables manufacturers to access on-spec, drop-in equivalents of essential ingredients used in food production, chemical manufacturing, and sustainable fuel development. Circe's technology removes three kilograms of CO₂ for every kilogram of product produced, offering a cost-competitive and environmentally sustainable alternative to traditional raw materials.