Circular Economy Startups

Sequent manufactures and distributes reusable totes available at over 38,000 retail locations across the United States, selling over 100 million units annually to consumers seeking sustainable alternatives to single-use bags.

1 investor

SERAPLANT GmbH operates a patented phosphorus recycling process that recovers nutrients from municipal sewage sludge for use in agriculture. The method aims to improve phosphorus efficiency in farming and meet regulatory requirements for phosphorus recovery from sewage sludge taking effect in 2029.

1 investor

Seventh Generation makes plant-based household cleaning products, including dish soaps, laundry detergents, all-purpose cleaners, and disinfectants formulated with biobased and botanical ingredients. Its consumer products carry EPA Safer Choice and USDA biobased certifications and are marketed as safe for families, children, and pets.

1 investor

seventhings offers an AI-supported asset intelligence platform that digitizes and centralizes inventory management of physical assets such as IT equipment, licenses, furniture, vehicles, and machines across their full lifecycle. It targets organizations with 250+ employees in the DACH region, particularly regulated sectors like healthcare, manufacturing, logistics, retail, education, and public administration, and includes tools for compliance documentation, lending, and circular reuse of assets.

1 investor

SG Enviro provides industrial water and wastewater management solutions using an Engineering, Procurement and Construction (EPC) approach, covering design, build, retrofitting, and operation of treatment, reclamation, sludge, biogas, and energy recovery systems. It serves petrochemical, oil & gas, renewable energy, food & beverage, manufacturing, and pharmaceutical clients across Southeast Asia, backed by an in-house treatability and analytical laboratory.

1 investor

Sharefox provides rental management software for equipment and activity-based rental businesses, covering online bookings, payments, subscriptions, self-service, and inventory management. It targets rental operators across multiple industries looking to run and grow an online rental store.

1 investor

Sharps Medical Waste Services provides medical waste disposal programs, including collection systems for sharps, regulated medical waste, universal waste, and unused medications, plus pick-up and mail-back services. It serves healthcare facilities ranging from single-provider clinics to multi-site hospital networks across the United States.

1 investor

Sheep Inc. is a knitwear brand making merino wool garments sourced from named regenerative high-country farms in New Zealand, with each piece embedding a near-field chip that lets wearers trace the wool back to a specific farm. It emphasizes traceability, small-batch dyeing, and carbon-negative, sustainable production for consumers buying quality knitwear.

1 investor

ShinSale sells second-hand tires, giving used tires a second life, and promotes reuse and conscious secondary consumption. The company highlights reduced CO2 emissions from its recycling activity.

1 investor

Shiperise guides investors and businesses in allocating resources to meaningful and transformative projects, with a focus on responsible innovation and sustainable initiatives. The company works to connect capital with ventures that balance economic growth with environmental and community well-being.

1 investor

SI Container Builds constructs sustainable steel-frame and repurposed shipping-container buildings for commercial, community, and residential use. It targets developers and homeowners with modular, off-site precision-built structures completed in roughly 8-12 weeks.

1 investor

SilicoLife uses AI and biological technology to produce pure, sustainable ingredients for industrial applications. The company focuses on making ingredient production more efficient, ethical, and accessible.

1 investor

Simplyfined develops a catalytic process to standardize renewable plant oils so they can replace petroleum in catalytic chemical reactions, enabling more sustainable chemical production. Its output serves manufacturers of consumer and industrial goods such as shampoos, mattresses, printer inks, lubricants, and surface coatings.

1 investor

Sinba is a Peruvian circular economy company that trains organizations, collects their waste, and transforms it into raw material. It serves businesses, events, schools, universities, and organizations of all sizes across Peru.

1 investor

Singular Solutions is a Canadian manufacturer of BioSustainable functional masterbatches and compostable compounds for flexible packaging, including patented additives for biodegradation of plastics and reduction of microplastics. Its products serve industries such as packaging, food, and agriculture.

1 investor

SipNShut makes reclosable, spill-proof aluminum can lids that drop into existing high-speed canning lines, aimed at beverage brands across categories such as water, energy drinks, beer, seltzers, wine, and CBD/THC drinks. The product offers a fully recyclable alternative to plastic packaging with the reclosability of plastic lids.

1 investor

Sirsak provides post-consumer packaging waste management services for businesses, including pickup, recovery, sorting, and safe disposal, along with waste management infrastructure such as community hubs, smart bins, and drop-off machines. It also helps clients meet waste regulations and runs education campaigns for communities, schools, and consumers, operating in Indonesia.

1 investor

Sixone recycles post-consumer polyester-blended textile waste into high-quality PET pellets, using AI and data-driven technology to selectively extract polyester from chemically complex blended fabrics. It supplies drop-in recycled polyester to apparel brands and textile manufacturers pursuing materials circularity goals.

1 investor

Smala is an online marketplace for second-hand, private-sale, and its own durable clothing for babies, children, and pregnant women, carrying over 300 kids' brands. Each item is individually inspected and shipped in a single package, and the platform also handles resale of used clothing on sellers' behalf. It serves parents in France.

1 investor

SmartBack manages product returns and reverse logistics for retailers, qualifying and redirecting unsaleable inventory to second-hand resellers and charitable organizations. The company handles collection, grading, pricing, and delivery of returned products across France.

1 investor

SMB Kenzai is a building materials trading company (shozai) serving the residential living-space industry, operating as part of the Mitsui & Co., Sumitomo Corporation, and Marubeni group. It emphasizes environmental preservation and a circular economy.

1 investor

Soane Materials develops plant-based, biodegradable materials and licenses the associated IP to consumer product manufacturers as replacements for plastics and petrochemicals. Its product lines cover nanofibrillated/microfibrillated cellulose processing, cleaning products, packaging, and absorbent products such as diapers and sanitary items.

1 investor

Soap2o produces soap products designed to reduce the shipment of water and the use of single-use plastics. The company positions sustainability as central to its products, operations, and supporting initiatives within the soap industry.

1 investor

Soiltech is a cleantech service provider that designs, builds, owns, and operates technologies for treating, recycling, and handling contaminated water and solid industrial waste streams. It works on customer sites and also offers biodegradable chemistry and treatment solutions for produced water and contaminated water across aquaculture, municipal, and other industries.

1 investor