Circular Economy Startups

Sella is a peer-powered marketplace that connects people who have pre-owned items to sell with local thrifters and resellers who handle the listing and selling on their behalf. The service targets households wanting to turn unused belongings into cash while extending the life of secondhand goods.

2 investors

Seloxium develops a metal recovery and refining technology (branded "Selectal") used for tailings reprocessing, wastewater treatment, bulk metal recovery, and high-purity refining. It targets recovery of metals such as scandium with an emphasis on higher recovery rates, processing speed, and metal purity.

2 investors

Seprify produces functional cellulose-based ingredients from renewable plant resources for industrial applications, offering biodegradable cellulose particles that serve as lower-carbon alternatives to conventional materials such as titanium dioxide. The company targets formulators and industrial users seeking natural, high-performance material inputs.

2 investors

Seventh Generation manufactures plant-based household and personal care products designed to reduce environmental impact and promote sustainable practices. The company targets environmentally conscious consumers and is committed to climate action, sustainable sourcing, plastic reduction, and supply chain equity.

2 investors

seventhings is a cloud-based asset management platform that helps companies digitize and centralize inventory tracking for IT equipment, office furniture, vehicles, and machinery. The platform combines AI-powered data capture, real-time asset tracking, lifecycle management, and circular economy features to optimize resource utilization and compliance for organizations across the DACH region.

2 investors

The Shell Works produces VIVOMER, a biodegradable biomaterial created through microbial fermentation of agricultural and industrial waste that mimics the performance of conventional plastic but breaks down safely when discarded. The company serves brands seeking sustainable packaging solutions compatible with existing manufacturing processes.

2 investors

Sheltersuit creates products to support people experiencing homelessness, operating social sewing ateliers that provide professional development training and employment while repurposing high-quality materials.

2 investors

Shit2Power builds a patented containerized system that converts dewatered sludge on-site into electricity, heat, and phosphorus-rich mineral ash through drying and thermochemical gasification. It serves municipal wastewater treatment plants and industrial operators (e.g. food factories, paper mills, biogas plants) primarily across the EU, replacing sludge transport and disposal.

2 investors

RE/DONE is a luxury denim brand founded in 2014 that creates limited-edition designs by upcycling vintage materials and repurposing heritage American brands. The company focuses on circular fashion and sustainable production practices for consumers seeking individuality in the denim market.

2 investors

S.I. Container Builds designs and constructs sustainable steel-frame housing structures using repurposed containers to address housing shortages and reduce environmental impact. The company serves both B2B developers and B2C homeowners seeking climate-resilient, code-certified construction solutions.

2 investors

Silvis Materials develops a bio-based, patent-pending adhesive binder derived from sustainable cellulose that replaces petroleum-based adhesives in building products and packaging. The material reduces carbon emissions by up to 80% in building products and up to 40% in packaging while enabling recycling of previously unrecyclable materials.

2 investors

Simpli operates a platform that enables enterprises to redirect excess inventory and unsold products to nonprofits and charities instead of destroying them. The company serves large enterprises seeking to reduce waste while supporting communities in need.

2 investors

Sironix Renewables is a Seattle-based manufacturer of plant-based, high-performance molecules and surfactants made from agricultural waste, intended to replace petrochemical ingredients. It serves consumer product manufacturers and formulators in industries such as personal care, cleaning, and agriculture.

2 investors

Smile Plastics (Smile Materials) makes recycled panel materials and solid surfaces for commercial interiors, turning waste streams such as plastics and reclaimed solid surface into durable panels for worktops, vanities, furniture and joinery. It serves hospitality, workplace, retail and residential design projects, with a focus on sustainability, circularity, and verified environmental accreditations.

2 investors

smol sells cleaning products designed to use less plastic, carbon and chemicals. The company positions its household cleaning range as a more environmentally conscious option for consumers' homes.

2 investors

Soil Safe operates soil recycling facilities across three states, processing petroleum-impacted soil and similar materials into engineered products for use in construction and development projects. The company has recycled over 30 million tons since its founding in 1989, diverting materials from landfills.

2 investors

Solar Materials recovers silver, silicon, aluminum, copper, and glass from end-of-life solar modules using a patented thermomechanical process that recovers 99% of materials. The company serves solar park operators, engineering procurement contractors, and module manufacturers with WEEE-compliant recycling solutions across Germany.

2 investors

Solid Oral Care manufactures plastic-free toothpaste products in various formats (paste, tablets, powder) using fluoride formulations made in-house in New Zealand. The company serves consumers seeking sustainable oral care alternatives with clinically effective formulations.

2 investors

Something Borrowed Blooms rents and returns reusable wedding flowers — bouquets, centerpieces, and other floral arrangements — as a lower-cost, waste-reducing alternative to fresh flowers. It serves couples, families, and event planners across the U.S. through a circular, subscription-style rental model.

2 investors

Spartech engineers and manufactures plastic sheet and specialty materials, sourcing most raw materials in the United States and operating facilities close to its customers. The company focuses on custom, sustainable, and high-performance plastic solutions developed through its materials science and engineering expertise.

2 investors

Spotless Water produces and distributes purified water (0.00 TDS) to professional and commercial customers including window cleaners, car detailers, solar panel cleaners, and aquatic hobbyists. The company operates self-service water stations as a cost-effective alternative to in-house water purification equipment.

2 investors

A retailer of patterned fabric and textiles for purchase by the yard.

2 investors

STABL Energy builds stationary industrial battery storage systems that reuse second-life electric vehicle batteries, offered as 20 ft outdoor containers and battery-hotel installations. The systems serve industrial and commercial customers for uses such as self-consumption optimization, peak shaving, and electricity trading, with cloud-based monitoring and multi-year performance guarantees.

2 investors

Starstech makes ECO-ST1, an eco-friendly de-icing/snow-melting agent designed to reduce the indirect costs of snow removal while limiting steel corrosion, concrete damage, and harm to plants, marine ecosystems, and pets. The product is marketed for road, bridge, and infrastructure winter maintenance.

2 investors