# Y Combinator's Cleantech Investments: 27 Startups in Its Portfolio (2026) > The 27 Cleantech startups Y Combinator has backed, by stage: $570M raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/y-combinator-cleantech-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Pre-seed and seed 11 - [Invert](https://millionrounds.com/company/invert) - [AirMyne](https://millionrounds.com/company/airmyne) - [ReliOn](https://millionrounds.com/company/relion) - [Valor Water Analytics](https://millionrounds.com/company/valor-water-analytics) - [FTEX](https://millionrounds.com/company/ftex) - [GreenLIB Materials](https://millionrounds.com/company/greenlib-materials) - [Jupe](https://millionrounds.com/company/jupe) - [Island Water Technologies](https://millionrounds.com/company/island-water-technologies) - [Glow Energy](https://millionrounds.com/company/glow-energy) - [Offstream](https://millionrounds.com/company/offstream) - [Proxy](https://millionrounds.com/company/proxy) ## Stage not reported 8 - [Twelve](https://millionrounds.com/company/twelve) - [Moxion Power](https://millionrounds.com/company/moxion-power) - [Itero](https://millionrounds.com/company/itero) - [HeyCharge](https://millionrounds.com/company/heycharge) - [MoltexFLEX](https://millionrounds.com/company/moltexflex) - [Seabound](https://millionrounds.com/company/seabound) - [ALT TEX](https://millionrounds.com/company/alt-tex) - [Heimdal](https://millionrounds.com/company/heimdal) ## Series B 3 - [Rainmaker](https://millionrounds.com/company/rainmaker) - [Polystyvert](https://millionrounds.com/company/polystyvert) - [SPARK Microsystems](https://millionrounds.com/company/spark-microsystems) ## Series A 3 - [Noya](https://millionrounds.com/company/noya) - [Clarasight](https://millionrounds.com/company/clarasight) - [Riff](https://millionrounds.com/company/riff) ## Growth 2 - [Converge](https://millionrounds.com/company/converge) - [Zeitview](https://millionrounds.com/company/zeitview) ## Segment by segment ### Pre-seed and seed 11 startups · $58M raised - [**Invert**](https://millionrounds.com/company/invert) Invert is a software startup that specializes in Bioprocess AI SaaS, focusing on enhancing biomanufacturing and bio-industrial operations. Canada $40M - [**AirMyne**](https://millionrounds.com/company/airmyne) AirMyne is a Direct Air Capture (DAC) company based in Berkeley, California, founded in 2022. United States $6.9M - [**ReliOn**](https://millionrounds.com/company/relion) Relion is an online platform for shift scheduling and time registration solutions. Canada $3.0M - [**Valor Water Analytics**](https://millionrounds.com/company/valor-water-analytics) Valor Water Analytics has developed customized financial data and dashboard tools for water utilities and businesses. United States $2.7M - [**FTEX**](https://millionrounds.com/company/ftex) FTEX is a Montreal-based company founded in 2017 that specializes in advanced electric vehicle (EV) powertrain solutions, focusing Canada $1.4M - [**GreenLIB Materials**](https://millionrounds.com/company/greenlib-materials) GreenLIB Materials is a long-term recovery process for key materials from all forms of lithium-ion batteries. Canada $1.1M - [**Jupe**](https://millionrounds.com/company/jupe) JUPE is a hospitality and modular housing technology company that specializes in designing flat-packed, off-grid shelter units. United States $1.1M - [**Island Water Technologies**](https://millionrounds.com/company/island-water-technologies) IWT develops and markets solar-powered wastewater treatment systems for domestic and industrial applications. Canada $500K ### Stage not reported 8 startups · $140M raised - [**Twelve**](https://millionrounds.com/company/twelve) Twelve offers smart payment solutions such as software modules, links, ordering solutions, internet solutions, communication & sponsorship. United States $117M - [**Moxion Power**](https://millionrounds.com/company/moxion-power) Moxion Power develops zero-emission generators and off-road equipment to support industries. United States $11M - [**Itero**](https://millionrounds.com/company/itero) Itero is a technology company based in London, United Kingdom, specializing in chemical recycling. United Kingdom $6.1M - [**HeyCharge**](https://millionrounds.com/company/heycharge) HeyCharge provides charging infrastructure, payment systems, and installation for electric vehicles. Germany $3.0M - [**MoltexFLEX**](https://millionrounds.com/company/moltexflex) MoltexFLEX is developing the advanced small modular FLEX reactor and GridReserve energy storage system. United Kingdom $1.7M - [**Seabound**](https://millionrounds.com/company/seabound) Seabound is a carbon capture technology company. United Kingdom $1.5M - [**ALT TEX**](https://millionrounds.com/company/alt-tex) ALT TEX is a biotech company that offerscarbon neutral fabric generated from post-industrial waste. Canada $216K - [**Heimdal**](https://millionrounds.com/company/heimdal) Heimdal is a climate technology company that specializes in direct air capture (DAC) technology to remove CO2 from the atmosphere. United Kingdom $40K ### Series B 3 startups · $180M raised - [**Rainmaker**](https://millionrounds.com/company/rainmaker) Rainmaker is a New York-based crypto and DeFi company that specializes in a mobile-first, account-abstraction wallet. United States $126M - [**Polystyvert**](https://millionrounds.com/company/polystyvert) Polystyvert est une entreprise montréalaise du secteur des technologies propres qui révolutionne le monde du recyclage des plastiq Canada $29M - [**SPARK Microsystems**](https://millionrounds.com/company/spark-microsystems) SPARK Microsystems is a Canadian fabless semiconductor company based in Montreal, Quebec. Canada $25M ### Series A 3 startups · $62M raised - [**Noya**](https://millionrounds.com/company/noya) Noya, also known as Noya Labs, is a climate technology company founded in 2020 and headquartered in San Francisco, California. United States $22M - [**Clarasight**](https://millionrounds.com/company/clarasight) Clarasight is a New York-based technology company founded in 2021 by Adam Braun and Philip Charm. United States $21M - [**Riff**](https://millionrounds.com/company/riff) Riff provides plans to musicians and connects them with industry access to a platform. United States $19M ### Growth 2 startups · $129M raised - [**Converge**](https://millionrounds.com/company/converge) Construction Technology. United Kingdom $69M - [**Zeitview**](https://millionrounds.com/company/zeitview) Zeitview, formerly known as DroneBase, is a leader in advanced inspection software and aerial data analytics, focusing on renewabl United States $60M **How this map is made.** Every startup here works in Cleantech and has raised money in a round we track that names Y Combinator as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Sector portfolio **Y Combinator's AI portfolio** 1,143 startups · $44B](https://millionrounds.com/portfolio-maps/y-combinator-ai-portfolio)[Sector portfolio **Y Combinator's Fintech portfolio** 338 startups · $24B](https://millionrounds.com/portfolio-maps/y-combinator-fintech-portfolio)[Sector portfolio **Y Combinator's Big Data & Analytics portfolio** 201 startups · $3.4B](https://millionrounds.com/portfolio-maps/y-combinator-big-data-analytics-portfolio)[Sector portfolio **Y Combinator's Healthtech portfolio** 150 startups · $4.2B](https://millionrounds.com/portfolio-maps/y-combinator-healthtech-portfolio)[Sector portfolio **Y Combinator's IT Services portfolio** 148 startups · $840M](https://millionrounds.com/portfolio-maps/y-combinator-it-services-portfolio)[Sector portfolio **Y Combinator's Web3 & Crypto portfolio** 139 startups · $7.4B](https://millionrounds.com/portfolio-maps/y-combinator-web3-crypto-portfolio) ## Raising from investors like Y Combinator? 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