What is CleanFiber?
Founded in 2013, CleanFiber (formerly Ultracell Insulation) has developed a proprietary process to create high-purity cellulose insulation. By blending recycled cardboard fibers with other clean paper feedstocks, the company produces an environmentally friendly and effective insulation product. This innovative approach positions CleanFiber as a key player in the green building sector, offering sustainable alternatives to traditional insulation materials and contributing to a circular economy. The company's commitment to recycling and eco-friendly manufacturing aligns with increasing market demand for sustainable construction solutions.
How much funding has CleanFiber raised?
CleanFiber has raised a total of $79.5M across 6 funding rounds:
Grant
$100K
Debt
$870K
Other Financing Round
$10M
Series B
$28M
Private Equity
$6.5M
Private Equity
$34M
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 Global Brain, Climate Innovation Capital, and Spring Lane Capital
Private Equity (2025): $6.5M, investors not publicly disclosed
Private Equity (2025): $34M, investors not publicly disclosed
Key Investors in CleanFiber
Global Brain
Global Brain is an independent venture capital firm that specializes in supporting startups to achieve global success through hands-on assistance and collaboration with large corporations. With over $2.3 billion in assets under management, the firm actively invests in more than 100 startups annually, focusing on various sectors including technology, healthcare, and education.
Climate Innovation Capital
Climate Innovation Capital focuses on finding, funding, and growing commercial innovations that aim to decarbonize the economy, presenting an unmatched economic opportunity. They partner with leading entrepreneurs, investors, and companies, investing in innovations across various sectors to accelerate climate technology deployment.
Spring Lane Capital
Spring Lane Capital specializes in investing in sustainable real assets, focusing on the 'missing middle' of project finance and corporate equity. They partner with real-asset platforms to build scalable companies that generate long-term value across various sectors, including energy, waste-to-value, transportation, and food & agriculture.
What's next for CleanFiber?
The substantial enterprise-level backing and recent strategic investment signal a pivotal phase for CleanFiber. This capital is likely to fuel significant operational scaling, including potential expansion of manufacturing capabilities and broader market penetration. CleanFiber may also invest in further research and development to enhance its product offerings and explore new applications for its patented fiber-blending technology. The company's focus on sustainability and recycled materials positions it favorably to capitalize on growing environmental regulations and consumer preferences for eco-conscious building products, potentially leading to further strategic partnerships and market leadership.
See full CleanFiber company page
