Best Sustainability Tech Companies in San Jose, United States
The 70 best Sustainability Tech companies in San Jose, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: SoloPower.
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 San Jose
| # | Company | Disclosed funding | Last round | Stage | Employees | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | SoloPower Provider of flexible thin-film photovoltaic cells | $273M | 164 mo ago | Series E | 24 | 2005 | — | 248 patents Thin‑film photovoltaic manufacturing, roll‑to‑roll processing, and building‑integrated solar modules | — |
| 2 | Frore Systems Developer of thermal management solutions for data centers and electronic devices 72Innovation top 16%Patents top 17%Funding top 18%Moat top 33% All 10 signals ▾Innovationtop 16% Patentstop 17% Fundingtop 18% Moattop 33% Newstop 34% Growthtop 35% Talenttop 38% Marketbottom 48% Techbottom 42% Globalbottom 40% Innovation: 194 patents (top 16% of patent-holders) · 163 filings since 2022 vs 31 in 2017-21 Patents: 194 patents matched (strict assignee match) · 163 filings since 2022 vs 31 in 2017-21 rank vs industry peers · Fliar Intelligence Index 72/100 | $190M | 3 mo ago | Series D | 75 | 2018 | WebflowVimeoreCAPTCHA+12 | 194 patents MEMS-enabled active cooling and thermal management for LED and electronic devices | — |
| 3 | Stion Manufactures solar modules | $90M | 107 mo ago | Deadpooled | 5 | 2006 | — | 301 patents Large-scale CIGS thin-film solar cell manufacturing equipment and processing methods. | — |
| 4 | Ariosa Diagnostics Domain management, brand protection, and cyber security solutions provider | $68M | 174 mo ago | Acqui-Hired | 246 | 2008 | — | 163 patents Non‑invasive prenatal genetic testing using cell‑free fetal DNA analysis | — |
| 5 | Aridis Pharma Provider of human monoclonal antibodies against infectious diseases | $42M | 42 mo ago | Public | 34 | 2005 | WordPressMySQLPHP+28 | — | — |
| 6 | Fat Spaniel Provider of solutions for renewable energy monitoring | $33M | 198 mo ago | Acquired | 15 | 2003 | — | 35 patents Remote commissioning, performance optimization, and predictive maintenance for renewable energy assets | — |
| 7 | Merlin Solar Manufacturers of solar modules 55Product top 26%Funding top 27%Tech top 27%Growth top 35% All 10 signals ▾Producttop 26% Fundingtop 27% Techtop 27% Growthtop 35% Patentstop 43% Moattop 43% Innovationtop 50% Talentbottom 49% Globalbottom 40% Marketbottom 38% Product: 11 distinct product lines · Company stage: Acquired Funding: Raised $31.0M across 2 rounds · 2 rounds over 2 yrs (1.0/yr) rank vs industry peers · Fliar Intelligence Index 55/100 | $31M | 6 mo ago | Acquired | 62 | 2016 | Wix eCommerceWixSentry+13 | 79 patents Metallic component manufacturing, surface blackening, and bonding for photovoltaic modules | — |
| 8 | FranklinWH Manufacturer of home energy management and battery storage solutions | $25M | 34 mo ago | Series B | 54 | 2019 | Node.jsElement UIVideoJS+23 | — | — |
| 9 | LED Engin LED emitters, light engines and lenses | $23M | 170 mo ago | Acqui-Hired | 30 | 2004 | — | — | — |
| 10 | Xangati Data center environment analytics and performance monitoring platform | $22M | 151 mo ago | Acqui-Hired | 23 | 2006 | — | 15 patents Advanced network traffic monitoring, anomaly detection, and flow processing for telecom infrastructure. | — |
| 11 | Amberflo Cloud-based invoicing and billing solution for businesses | $20M | 41 mo ago | Series A | 27 | 2020 | — | — | — |
| 12 | Cassatt Data center automation software | $15M | 243 mo ago | Acqui-Hired | 2 | 2003 | — | 49 patents Autonomic resource orchestration and management for distributed computing systems | — |
| 13 | Dwelo A smart apartment management solution for managers and residents | $14M | 64 mo ago | Acquired | 49 | 2014 | Craft CMSPHPYii+12 | 8 patents Smart‑home device rights management and automated control transition systems | — |
| 14 | EnerTalk Solution for power consumption monitoring | $13M | 106 mo ago | Series A | 1 | 2013 | Node.jsNginxExpress+3 | — | — |
| 15 | Join Cloud-based maintenance management software for owners and property managers | $10M | 74 mo ago | Series A | 10 | 2016 | — | 3 patents AI-driven recommendation engines and automated structural design generation using machine learning | 1 award |
| 16 | BIA Controls Provider of IoT-enabled energy management solutions | $5M | 48 mo ago | Series A | 7 | 2020 | — | — | — |
| 17 | Corinth MedTech Provider of resectoscope for surgical procedure and fluid management solution | $5M | 65 mo ago | Funding Raised | 12 | 2014 | — | 33 patents Innovative surgical instruments for minimally invasive procedures and related device methods. | — |
| 18 | Previvo Genetics Developer of preimplantation genetic diagnostics and screening device | $3M | 117 mo ago | Series A | — | 2012 | WebflowGSAPSplide+18 | 47 patents Reproductive medicine devices for uterine lavage and in‑vivo embryo recovery/processing | — |
| 19 | Haven Connect Provider of property management software solutions for affordable housing | $3M | 87 mo ago | Series A | 6 | 2014 | Squarespace CommerceSquarespaceTypeScript+15 | — | — |
| 20 | Full Cycle Provider of solutions to convert plastic into biopolymers | $2M | 115 mo ago | Deadpooled | 19 | 2014 | — | — | — |
| 21 | Ecosense Provider of accurate, fast radon detection monitors for homes and professionals. | $1M | 34 mo ago | Seed | 13 | 2019 | Cart FunctionalityShopifyZoho+12 | 3 patents Storm water filtration and treatment infrastructure for runoff management | 1 launch · 1 award |
| 22 | Shield Bio Provides technology for developing precision drugs for treating infectious diseases | $920K | 97 mo ago | Deadpooled | 28 | 2016 | — | — | — |
| 23 | Cypress Envirosystems IoT retrofit solutions digitizing legacy equipment for smart facilities | $466K | 157 mo ago | Seed | 87 | 2006 | — | 9 patents Advanced HVAC analytics, pneumatic control/energy harvesting, and gauge sensing instrumentation. | — |
| 24 | LiquiLume Diagnostics Optofluidic based immunodiagnostic platform | $422K | 168 mo ago | Deadpooled | — | 2010 | — | — | — |
| 25 | ZutaCore Provider of waterless liquid cooling solutions for artificial intelligence and computing | $397K | 16 mo ago | Seed | 48 | 2016 | HubSpot CMS HubApple iCloud MailGoogle Workspace+20 | — | 2 job openings |
| 26 | ferveret Developer of adaptive phase cooling technology for data center infrastructure | $125K | 36 mo ago | Seed | 5 | 2020 | WebflowCloudflare TurnstileHSTS+12 | 8 patents Thermal management hardware: heat exchangers and cooling systems for electronic devices. | 2 launchs |
Top 12 Sustainability Tech companies in San Jose
#1
Series D · San Jose, California · founded 2018 · 75 employees$190Mraised▾
Developer of thermal management solutions for data centers and electronic devices. The company offers direct-to-chip liquid cooling and solid-state active air cooling products. These cooling solutions are applicable to consumer devices, industrial embedded systems, and data centers. The company's products aim to improve performance and enable compact designs.
- Mar 2026Series D$143M
- May 2024Series C$90M
- Dec 2022Series B$100M
- 2018Series A—
#2
Acquired · San Jose, California · founded 2016 · 62 employees$31Mraised▾
Manufacturers of solar modules. It provides crystalline silicon-based solar solutions which address deployments such as on metal roofs, auxiliary power for transportation, flush-mounted residential solar, and military applications. It also provides solutions for interconnect system that enables them to extract more power compared to standard solar panels and also improve the reliability performance, and ruggedness of the solar panels.
- Dec 2025Series B$16.1M
- Oct 2024Series B$31M
#3
Public · San Jose, California · founded 2005 · 34 employees$42.1Mraised▾
Provider of human monoclonal antibodies against infectious diseases. The company's lead human antibodies candidates are against hospital-acquired pneumonia, ventilator-associated pneumonia, and cystic fibrosis. The company’s products target infectious diseases, including nosocomial infections, cystic fibrosis, and severe wound infections. In addition, it offers mAb discovery technology platform that enables the recovery of rare, naturally occurring protective antibodies generated by the human immune system.
- Dec 2022Post IPO$4.8M
- Oct 2020Post IPO$8.5M
- Jan 2017Grant (prize money)—
- Dec 2016Series B$13.6M
#4
Series E · San Jose, California · founded 2005 · 24 employees$272.9Mraised▾
Provider of flexible thin-film photovoltaic cells. It offers high-efficiency, low-cost Copper-Indium-Gallium-Selenide-based devices to enable solar electricity generation at a cost that is competitive with traditional methods.
- Oct 2012Series E$12M
- Jun 2012Series E$10.8M
- May 2012Series E$7.1M
- Dec 2011Series E$20.1M
#5
Series B · San Jose, California · founded 2019 · 54 employees$25Mraised▾
Manufacturer of home energy management and battery storage solutions. The company provides systems designed for uninterrupted power during blackouts or peak demand. The systems manage solar, battery, generator, electric vehicle, and grid power. The company's app allows control, real-time monitoring, and analysis of energy status.
- Aug 2023Series B$25M
- Aug 2022Seed—
- Seed—
#6
Seed · San Jose, California · founded 2016 · 48 employees$396.6Kraised▾
Provider of waterless liquid cooling solutions for artificial intelligence and computing. The company’s technology removes heat directly at the processor through a closed-loop system. This approach eliminates water use and reduces energy consumption. It helps data centers scale performance and advance sustainability across digital infrastructure. The company offers end-of-row cooling units that deliver centralized, multi-rack cooling with rack-level monitoring.
- Feb 2025Seed—
- Jun 2024Seed—
- Jan 2024Grant (prize money)$396.6K
- Sep 2023Seed—
#7
Series A · San Jose, California · founded 2020 · 27 employees$20Mraised▾
Cloud-based invoicing and billing solution for businesses
- Jan 2023Series A$15M
- Seed$5M
#8
Deadpooled · San Jose, California · founded 2006 · 5 employees$90Mraised▾
Stion manufactures thin-film, solar PV modules having high-efficiency. The company not only provides solutions and technology for the cost reduction of PV modules but the whole solar system.
- Jul 2017Grant (prize money)$956.6K
- Dec 2012Series D$25M
- Jun 2010Series C$50M
- Jun 2007Series B$15M
#9
Acqui-Hired · San Jose, California · founded 2008 · 246 employees$67.5Mraised▾
Domain management, brand protection, and cyber security solutions provider, offering comprehensive services for online presence. Specializing in domain registration across numerous extensions, the company provides enterprise domain management, online brand monitoring, and enforcement services. Their expertise extends to domain consultancy, strategy, name acquisition, disputes, and recovery. They also offer web hosting, data center solutions, and SSL management, ensuring robust cyber security. This makes them a key player in the B2B tech industry, providing essential services for businesses seeking to protect and manage their digital assets.
- Nov 2011Series C$52.7M
- May 2010Series B$12.8M
- Jan 2009Series A$2M
#10
Acquired · San Jose, California · founded 2014 · 49 employees$13.8Mraised▾
A smart apartment management solution for managers and residents. The company has developed a hub which sits in the home and communicates with home automation devices like lighting, locks and thermostats. The property manager can manage their vacant apartments and give access to new tenants using the platform. Tenants can use the platform to control home devices. It works on a subscription-based model with a upfront cost for each smart device.
- Feb 2021Series A$5.6M
- Mar 2020Series A$4.8M
- Dec 2018Series A$2.3M
- Aug 2018Series A—
#11
Acquired · San Jose, California · founded 2003 · 15 employees$32.6Mraised▾
Provider of solutions for renewable energy monitoring. It is an independent provider of critical monitoring and reporting services for the renewable energy industry. The company's solutions are utilized by solar power producers, financiers, system integrators, OEMs, and growing a growing number of wind power companies. Fat Spaniel solutions help optimize energy output, reduce operations and maintenance costs, contain risk, and increase return on investment for renewable energy power plant projects.
- Dec 2009Conventional Debt$4.6M
- Jan 2008Series B$18M
- Nov 2007Series A$3M
- Oct 2006Series A$7M
#12
Acqui-Hired · San Jose, California · founded 2004 · 30 employees$23Mraised▾
LED Engin develops, manufactures, and sells advanced LED emitters, optics and light engines to create uncompromised lighting experiences for a wide range of entertainment, architectural, general lighting and specialty applications. It offers 1-, 4-, 9-, 12- and 24-die emitter products with highest efficacies in smallest packages with color offerings of red, deep red, far red, green, blue, amber, dental blue and white in the visible range and ultra violet (365nm and 400nm) and infrared (850nm) in the non-visible range. Their LuxiTune is a single-emitter light engine capable of true blackbody dimming from 3000K to 1800K with easy-to-use 0-10V dimmers.
- Apr 2012Series E$12M
- Jul 2010Series D—
- Oct 2007Series C$11M
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
How research on Climate Adaptation is moving in the United States
A read on the academic research around Climate Adaptation — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 1,953 United States-affiliated papers.
- Columbia University52
- University of North Carolina at Chapel Hill43
- Arizona State University42
- Texas A&M University42
- Purdue University West Lafayette35
- Flood myth4→56
- Climate change6→47
- Flooding (psychology)2→23
- Climate resilience1→16
- Flood mitigation2→14
- Flood myth50→178
- Climate change35→155
- Flooding (psychology)18→97
- Resilience (materials science)10→84
- Psychological resilience12→55
- Climate change71→449
- Resilience (materials science)17→139
- Flood myth36→158
- Psychological resilience13→115
- Climate resilience14→92
Where climate adaptation is researched across United States
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Who's filing climate adaptation patents in the United States
United States climate adaptation patent filing is cooling — 28 filings from 19 assignees (2016–2025), led by ILC Dover, Garcia Rogerio, Serralta Denset; annual filings 6→1.
- ILC Dover20
- Garcia Rogerio4
- Serralta Denset4
- Zesty AI2
- Yodock GUY1
- Mckee TONY RAY1
- Ballard Tristan1
- Cooper Matthew1
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.