Best Sustainability Tech Companies in Seattle, United States
The 104 best Sustainability Tech companies in Seattle, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Porch Group.
Our analysis of 84 Sustainability Tech companies
$19.4b in tracked funding; 85% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Sustainability Tech companies in Seattle
| # | Company | Disclosed funding | Last round | Employees | Founded | Founder | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | Porch Group Provides software & service to home improvement industries | $718M | 38 mo ago | 1,800 | 2013 | Matt Ehrlichman Founder | — | — |
| 2 | Adaptive Biotechnologies Provider of clinical diagnostics, and drug discovery for immune diseases | $419M | 100 mo ago | 609 609 → 654 (+7%) · sector median +21% | 2009 | Harlan Robins co-founder and chief Scientific Officer | 351 patents Immune repertoire sequencing for diagnostics, vaccine response, and engineered T‑cell therapies | 3 partnerships |
| 3 | Icosavax Developer of computationally designed VLP vaccines for treating multiple infections | $152M | 62 mo ago | 60 | 2017 | Adam Simpson Founder & CEO | 123 patents Recombinant influenza neuraminidase tetramer nanoparticle vaccine antigens | 1 partnership · 1 award |
| 4 | LevelTen Energy Online renewable energy PPA marketplace | $137M | 23 mo ago | 146 | 2016 | Bryce Smith Founder & CEO | — | 1 job opening |
| 5 | WSHFC Housing finance commission focused on developments | $122M | 84 mo ago | 97 | 1983 | — | — | 1 job opening |
| 6 | Curevo Developer of vaccines for the treatment of various diseases 29Funding top 25%Talent top 41%Moat top 43%Patents top 48% All 9 signals ▾Fundingtop 25% Talenttop 41% Moattop 43% Patentstop 48% Techtop 50% Innovationbottom 45% Globalbottom 39% Marketbottom 22% Newsbottom 18% Funding: Raised $86.0M across 3 rounds · 3 rounds over 4 yrs (0.8/yr) Talent: Analyst team rating 4/5 · 1 named leader on record rank vs industry peers · Fliar Intelligence Index 29/100 | $86M | 15 mo ago | 8 | 2017 | George Simeon CEO | 3 patents Herpes zoster and combination vaccine formulations for immunogenic protection | — |
| 7 | Omnidian Provider of monitoring and maintenance solutions for solar PV systems | $81M | 13 mo ago | 192 | 2015 | David Kenny Co-Founder & Chief Operating Officer | — | — |
| 8 | Lumen Developer of biological drugs for the treatment of infectious diseases | $68M | 32 mo ago | 67 | 2011 | Brian Finrow CEO & Founder | — | — |
| 9 | Theraclone Sciences Discovering human monoclonal antibodies for safe and effective therapeutic product development | $61M | 133 mo ago | 19 | 2004 | Clifford J Stocks CEO | 225 patents Broadly neutralizing HIV‑1 envelope (Env) trimer monoclonal antibody therapeutics | — |
| 10 | Deako Manufacturer of modular smart lighting systems and related accessories | $61M | 23 mo ago | 21 | 2015 | — | 30 patents Patents concentrated in computing, sensing & instrumentation | 1 launch |
| 11 | Cardeas Pharma Developer of inhaled antibiotics for DR gram negative infections | $49M | 134 mo ago | 2 | 2010 | — | — | — |
| 12 | Optimum Energy SaaS-driven HVAC optimization software for commercial spaces | $41M | 115 mo ago | 47 47 → 106 (+126%) · sector median +21% | 2005 | Larry Stapleton CEO & President | 75 patents Patents concentrated in mechanical & energy engineering | 5 job openings |
| 13 | Tune Therapeutics Developer of cell and gene therapy by using the epigenomic platform | $40M | 39 mo ago | 89 | 2009 | Akira Matsuno Co-Founder | — | — |
| 14 | Inspectify Provider of SaaS-driven inspection management services for professionals and homeowners | $33M | 20 mo ago | 34 34 → 75 (+121%) · sector median +21% | 2019 | Josh Jensen Co-Founder & CEO | — | 1 launch |
| 15 | Membrion Developer of membranes for the flow battery market | $32M | 12 mo ago | 29 | 2016 | Greg Newbloom President & CEO | 39 patents Ceramic ion‑exchange membranes for selective capture and separation of chemicals | — |
| 16 | HDT Bio Developer of immunotherapy for the treatment of cancer & infectious diseases | $31M | 13 mo ago | 32 32 → 54 (+69%) · sector median +21% | 2018 | — | — | 1 award |
| 17 | Evrnu Provider of sustainable fabrics from recycled cloths | $27M | 27 mo ago | 22 | 2014 | Christopher Stanev Co-Founder & President | — | — |
| 18 | Powerit Solutions Demand response solutions | $26M | 145 mo ago | 22 | 2006 | Kevin Klustner CEO & Board Director | 4 patents Smart power demand management and automated charging systems for electrical grids | — |
| 19 | Etubics Therapeutic vaccines for cancer | $23M | 141 mo ago | 14 | 2005 | — | 160 patents Manufacturing adenoviral vectors for multi‑vaccine and cancer immunotherapy applications | — |
| 20 | Koronis Pharmaceuticals Developing innovative biotechnology platforms for viral research and therapeutics | $21M | 128 mo ago | 4 | 1998 | — | — | — |
| 21 | Nori Provider of carbon dioxide removal marketplace | $19M | 38 mo ago | 43 | 2017 | Paul Gambill Co-Founder & CEO | — | — |
| 22 | StormSensor Developer of IoT enabled solution to track and prevent stormwater pollution or flooding | $19M | 54 mo ago | 30 | 2015 | — | 14 patents Real-time stormwater flow and depth sensing with tidal decoupling for flood risk modeling | — |
| 23 | InBios Innovating immunodiagnostics for infectious diseases, improving global health outcomes | $18M | 13 mo ago | 73 | 1996 | Estela Raychaudhuri CEO & President | 24 patents Rapid lateral flow immunoassays for detecting viral and parasitic infectious diseases | — |
| 24 | Climate Vault Provider of solutions for organizations and project developers to mitigate emissions | $16M | 22 mo ago | 41 | 2020 | — | — | — |
| 25 | Ridwell Provider of convenient hard-to-recycle item pickup services | $15M | 6 mo ago | 177 177 → 99 (-44%) · sector median +21% | 2018 | Ryan Metzger Co-Founder & CEO | — | — |
| 26 | Green Canopy NODE Developer of green building communities | $15M | 55 mo ago | 33 33 → 34 (+3%) · sector median +21% | 2010 | Andy Wolverton Co-Founder | — | — |
| 27 | Calico Energy Connectivity platform for integration of all small grid appliances | $13M | 104 mo ago | 24 24 → 29 (+21%) · sector median +21% | 2004 | Matthew Haak Co- Founder & Director | — | — |
| 28 | Wally Provider of connected water leak detectors | $13M | 136 mo ago | 11 | 2012 | Shwetak Patel Co-Founder | 2 patents Personalized marketing systems for generating and delivering targeted offers | — |
| 29 | Allumia IoT and AI-driven energy management solutions | $10M | 51 mo ago | 37 | 2013 | Quintin Barnes Co-Founder & VP | — | 1 partnership |
| 30 | Tria Bioscience Innovating hearing technology for biomedical equipment manufacturers worldwide | $9M | 92 mo ago | — | 2009 | Christopher Clegg Founder & President | — | — |
| 31 | Drift Offering solutions for energy trading and tracking | $9M | 103 mo ago | 3 | 2015 | Ed McKenzie Co-Founder | — | — |
| 32 | Peregrine Hydrogen Green hydrogen production | $8M | 11 mo ago | 6 | 2023 | Stefan Omelchenko Co-Founder / VP of Operations and Strategy | 20 patents Efficient sulfur‑dioxide depolarized electrolysis for low‑carbon hydrogen and sulfuric acid production | — |
| 33 | Oscilla Power Provider of wave energy harvesting system | $7M | 46 mo ago | 20 | 2009 | Balky Nair President and CEO | 147 patents Wave energy conversion systems and marine vehicle power integration | 1 award |
| 34 | Atossa Therapeutics Developer of drugs for treating breast cancer | $7M | 64 mo ago | 10 | 2009 | — | 166 patents Sustained‑release endocrine modulators and pulmonary drug formulations using heparin/N‑acetylcysteine. | — |
| 35 | Optio3 IoT based web platform to monitor energy consumption in commercial buildings | $6M | 73 mo ago | 15 | 2016 | — | — | — |
| 36 | Anavasi Diagnostics Manufacturer of molecular detector for COVID-19 | $6M | 55 mo ago | 30 | 2020 | Minh Duong Co-Founder | — | — |
| 37 | Immunexpress Molecular diagnostics for the detection of sepsis. | $6M | 80 mo ago | 16 | 2006 | — | — | 1 launch |
| 38 | Abacus Bioscience Developer of immunotherapeutics for treating cancer and viral diseases | $4M | 40 mo ago | 7 | 2015 | Edward Clark Founder and Chair | — | — |
| 39 | Bellwether Housing Provider of affordable housing development services | $3M | 85 mo ago | 158 158 → 121 (-23%) · sector median +21% | 1980 | Susan Boyd CEO | — | — |
| 40 | Vor Systems AI-enabled transaction platform for energy asset transactions | $3M | 3 mo ago | — | 2025 | Victor Shao Co-Founder & CEO | — | — |
| 41 | adyn Provider of DNA and hormone analysis based birth control optimization kits | $3M | 62 mo ago | 10 | 2019 | — | — | — |
| 42 | Buildpulse SaaS-driven analytics solutions for buildings | $3M | 97 mo ago | 17 | 2013 | — | 8 patents Automated sensor discovery, classification, and airflow control for HVAC building automation systems. | — |
| 43 | Scope 5 ESG reporting and sustainability software, data integration, and consulting services | $2M | 94 mo ago | 14 | 2011 | — | 44 patents Variable travel valve timing mechanisms for internal combustion engines | — |
| 44 | Microplanet Technology Voltage regulation products for utilities | $1M | 149 mo ago | — | 1995 | Brett Ironside CEO | 7 patents Electronic power conversion and control systems for regulated power electronics | — |
| 45 | Optimum Energy Online platform offering HVAC management solutions | $1M | 188 mo ago | 47 | 2006 | — | 75 patents Advanced HVAC energy optimization and predictive free‑cooling for building grid integration | — |
| 46 | ClearSign Provider of combustion efficiency enhancement technology solutions | $1M | 16 mo ago | 16 16 → 23 (+44%) · sector median +21% | 2008 | — | — | 1 launch |
| 47 | MalarVx Developing innovative malaria vaccines using RNA technology and in vitro culture systems | $1M | 69 mo ago | 5 | 2012 | — | 3 patents Malaria vaccine formulations and delivery devices for sterile protection. | — |
| 48 | Ario Healthy lighting solutions mimicking natural light for better health and well-being | $1M | 116 mo ago | 3 | 2015 | — | — | — |
| 49 | BlueDot Photonics Manufacturer of nanotech-enabled solar panels and photonic devices | $1M | 61 mo ago | 2 | 2018 | Matthew Crane Co-Founder | — | — |
| 50 | ID Genomics Diagnostics for drug resistant infections. | $736K | 57 mo ago | 3 | 2012 | — | 149 patents Blood-based cardiovascular diagnostics and automated tissue sample processing technologies. | — |
Top 12 Sustainability Tech companies in Seattle
#1
Series C · Seattle, Washington · founded 2015 · 192 employees$81.5Mraised▾
Provider of monitoring and maintenance solutions for solar PV systems. It specializes in developing monitoring systems for domestic solar PV systems. It offers a day-to-day monitoring system that is used for risk management and project management of the installed photovoltaic system. Also, provides repair service and maintenance for solar energy system through signed contracts.
- Apr 2025Series C$87M
- Oct 2023Series B$25M
- Sep 2021Series B$36.4M
- Jun 2019Series A$15M
#2
Series B · Seattle, Washington · founded 2018 · 177 employees$15Mraised▾
Provider of convenient hard-to-recycle item pickup services. The company collects hard-to-recycle materials, such as plastic film, batteries, and light bulbs, directly from customers' homes. Using provided bags, customers store these items until bi-weekly pickup. Collected materials are then recycled or reused by vetted partners, diverting waste from landfills. The service aims to simplify the recycling process for consumers and promote sustainable waste management practices.
- Nov 2025Series B$15M
#3
Series B · Seattle, Washington · founded 2016 · 29 employees$32.2Mraised▾
Developer of membranes for the flow battery market. The company is engaged in the development of high-performance membranes to reduce the cost and improve the performance of flow batteries. Its first membrane is built for redox flow batteries, other potential use cases include pharmaceutical purification, fuel cells, and reverse osmosis.
- Jun 2025Series B$20M
- Feb 2025Series B$1M
- Nov 2024Series B$1.9M
- Aug 2023Series B$12.5M
#4
Seed · Seattle, Washington · founded 2025$3Mraised▾
AI-enabled transaction platform for energy asset transactions. It streamline transactions and financing for complex renewable energy assets, such as M&A, project finance, and tax equity deals. It processes massive document volumes to extract key insights like site risks, offtake details, and market dynamics, enabling faster due diligence for buyers, sellers, IPPs, lenders, and advisors.
- Mar 2026Seed$3M
#5
Series B · Seattle, Washington · founded 2017 · 8 employees$86Mraised▾
Developer of vaccines for the treatment of various diseases. The company's product pipeline includes CRV-101, for Herpes Zoster, CRV0-102 used against chicken pox. Other products of the company include CRV-201 used against the respiratory syncytial virus.
- Mar 2025Series B$110M
- Nov 2022Series A$26M
- Jan 2022Series A$60M
#6
Seed · Seattle, Washington · founded 2018 · 32 employees$30.6Mraised▾
HDT Bio is a developer of immunotherapy for the treatment of cancer & infectious diseases. It enhances the body's immunity power to fight against cancer disease. It increases tumor junctions and improves the disruptive capability. It helps in the tumor penetrance and therefore improves the efficacy, of diverse therapeutics including chemotherapeutics like Paclitaxel, Doxil, Cisplatin, antibodies, oncolytic viruses, and cell therapies. It helps in the treatment of breast cancer, ovarian cancer, and many more. It also provides solutions for pathogen agnostic therapeutics that offer solutions against gram-positive and gram-negative bacteria.
- May 2025Grant (prize money)$2.7M
- May 2025Grant (prize money)$1.6M
- May 2025Grant (prize money)$2.2M
- Apr 2025Grant (prize money)$2M
#7
Funding Raised · Seattle, Washington · founded 1996 · 73 employees$18Mraised▾
Innovating immunodiagnostics for infectious diseases, improving global health outcomes. This biotechnology company specializes in the design, development, and manufacture of high-quality immunodiagnostic devices for infectious diseases and biothreats. They strive to improve health outcomes globally by providing superior quality products that are accurate, easy to use, and cost-effective. Their team of scientists and engineers have extensive experience in developing and manufacturing in vitro diagnostic tests, with expertise in infectious diseases. They offer reliable and practical solutions for challenging infectious disease diagnoses. They develop proprietary technologies used to create rapid and ELISA-based immunodiagnostic assays. They also specialize in the development and manufacture of highly specific and well-characterized antibodies and antigens for use in infectious disease research. They are a total solution company with expertise in all facets of the product pipeline, from discovery to application, partnering with private companies, federal laboratories, and academia to bring customers the best scientific solutions for their diagnostic needs. They offer assay development
- May 2025Grant (prize money)$2M
- May 2024Grant (prize money)$1000K
- Nov 2022Grant (prize money)$100K
- Mar 2020Grant (prize money)$598K
#8
Series D · Seattle, Washington · founded 2016 · 146 employees$137.3Mraised▾
Online renewable energy PPA marketplace. It offers a renewable energy transaction platform connecting power buyers to PPAs from utility-scale wind, solar, and storage projects. The PPA product enables customers of various sizes to access the financial security of fixed-price renewables, economic benefits of at-scale projects, portfolio advantages of geographic & resource diversity, and sophisticated analysis of respected wholesale market experts.
- Jul 2024Series D$65M
- Nov 2023Series C$10M
- Aug 2021Series C$35M
- Jun 2019Series B$20.5M
#9
Series A · Seattle, Washington · founded 2023 · 6 employees$7.8Mraised▾
Green hydrogen production. It provides thermodynamic and dual production approach solutions for the production of hydrogen.
- Jul 2025Series A$7.5M
- Jul 2024Grant (prize money)$500K
- Sep 2023Seed$7.8M
#10
Series B · Seattle, Washington · founded 2015 · 21 employees$60.7Mraised▾
Manufacturer of modular smart lighting systems and related accessories. The company provides smart switches, dimmers, plugs, and simple switches, including motion sensor, nightlight, timer, and ceiling fan controllers. It also offers whole-home solutions, backplates, and faceplates. The company's lighting systems allow users to personalize lighting based on lifestyle.
- Jun 2024Series B$3.4M
- Oct 2022Series B$13.4M
- Mar 2021Series B$12.5M
- May 2020Series B$751.1K
#11
Series B · Seattle, Washington · founded 2019 · 34 employees$32.8Mraised▾
Provider of SaaS-driven inspection management services for professionals and homeowners. Solutions are provided for inspectors, real estate professionals, and home buyers. Users can book home inspections by providing the address or the location of the house.
- Sep 2024Series B$15.5M
- Jul 2023Series A$5.8M
- Nov 2021Series A$11.4M
- Aug 2020Seed$150K
#12
Public · Seattle, Washington · founded 2013 · 1800 employees$718.3Mraised▾
Provides software & service to home improvement industries. It provides an inspection support network, home inspection software, an online marketplace to book professional movers to pack, load, and haul their goods, roofing software, concierge service & more.
- Apr 2023Post IPO$333.3M
- Sep 2021Post IPO$385M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Sustainability Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.