What is CleanFiber?
Founded in 2013 and formerly known as Ultracell Insulation, CleanFiber has established a dominant market position by transforming recycled cardboard and clean paper feedstocks into high-purity cellulose insulation. The company's patented process addresses the growing demand for sustainable, high-performance building materials that reduce carbon footprints without compromising on thermal efficiency. By operating at the intersection of waste management and construction technology, CleanFiber provides a scalable solution to the environmental challenges inherent in traditional insulation manufacturing.
The firm's ability to maintain product purity while utilizing recycled inputs has allowed it to capture significant market share, transitioning from a niche manufacturer to an enterprise-level entity. Its operational model is designed to integrate seamlessly into existing supply chains, providing a sustainable alternative that meets the rigorous standards of modern green building certifications.
How much funding has CleanFiber raised?
CleanFiber has raised a total of $84M across 7 funding rounds:
Grant
$100K
Debt
$870K
Other Financing Round
$10M
Series B
$28M
Stock/Share Issuance
$34M
Stock/Share Issuance
$6.5M
Debt
$4.5M
Grant (2014): $100K with participation from United States Environmental Protection Agency
Debt (2017): $870K, investors not publicly disclosed
Other Financing Round (2022): $10M supported by AXA IM Alts
Series B (2024): $28M featuring Climate Innovation Capital, Spring Lane Capital, and Global Brain
Stock/Share Issuance (2025): $34M, investors not publicly disclosed
Stock/Share Issuance (2025): $6.5M, investors not publicly disclosed
Debt (2026): $4.5M, investors not publicly disclosed
Key Investors in CleanFiber
Climate Innovation Capital
A venture firm dedicated to decarbonizing the economy by funding commercial innovations and partnering with entrepreneurs to accelerate climate technology deployment.
Spring Lane Capital
An investment firm specializing in sustainable real assets, focusing on project finance and corporate equity to build scalable infrastructure platforms.
Global Brain
An independent venture capital firm providing hands-on assistance and strategic consulting to startups, leveraging a vast network to foster global success.
What's next for CleanFiber?
With the successful closure of this major strategic investment, CleanFiber is poised to accelerate its infrastructure deployment and expand its production capacity to meet rising global demand. The company is expected to focus on scaling its proprietary technology, enhancing its supply chain resilience, and deepening its partnerships with key stakeholders in the sustainable real assets space. As the construction industry faces increasing pressure to decarbonize, CleanFiber's strategic roadmap emphasizes the optimization of its manufacturing footprint and the pursuit of long-term value creation through technological innovation.
The infusion of capital will likely support the development of next-generation insulation products and the expansion of its operational reach, ensuring that the company remains at the forefront of the climate technology sector. By maintaining a focus on operational excellence and strategic growth, CleanFiber is well-positioned to navigate the complexities of the current economic landscape while continuing to drive the transition toward a low-carbon built environment.
