Best Sustainability Tech Companies in Connecticut, United States
The 76 best Sustainability Tech companies in Connecticut, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: melinta therapeutics.
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 Connecticut
| # | Company | Disclosed funding | Last round | Stage | Employees | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | melinta therapeutics Melinta Therapeutics is an antibiotics-focused company that develops and commercializes antibiotics to… | $186M | 88 mo ago | Public | 162 | 2000 | — | 376 patents Novel boronic acid‑based beta‑lactamase inhibitors for treating resistant bacterial infections | — |
| 2 | The Richman Group Developer, investor, asset manager, and property manager of residential apartments | $120M | 86 mo ago | Acquired | 104 104 → 165 (+59%) | 1987 | WordPressMySQLPHP+17 | 6 patents Real-time security monitoring systems integrating human guard augmentation and protocol management | — |
| 3 | Budderfly Provider of energy management solutions and services for buildings 76Innovation top 19%Patents top 19%Funding top 22%Growth top 27% All 11 signals ▾Innovationtop 19% Patentstop 19% Fundingtop 22% Growthtop 27% Newstop 30% Moattop 32% Producttop 33% Techtop 41% Talenttop 41% Marketbottom 49% Globalbottom 36% Innovation: 68 patents (top 23% of patent-holders) · 43 filings since 2022 vs 9 in 2017-21 Patents: 68 patents matched (strict assignee match) · 43 filings since 2022 vs 9 in 2017-21 rank vs industry peers · Fliar Intelligence Index 76/100 | $85M | 2 mo ago | Acquired | 103 | 2007 | HubSpot CMS HubApple iCloud MailZoho+29 | 68 patents IoT-enabled energy management and efficiency technologies for industrial/commercial power systems | 2 partnerships |
| 4 | NanoViricides Targeted antiviral therapeutics 14Funding top 26%Moat top 48%Growth bottom 40%News bottom 35% All 7 signals ▾Fundingtop 26% Moattop 48% Growthbottom 40% Newsbottom 35% Globalbottom 30% Marketbottom 29% Techbottom 24% Funding: Raised $47.0M across 7 rounds · 7 rounds over 15 yrs (0.5/yr) Moat: Editorial + unicorn rating 5/10 · 10 curated direct competitors tracked rank vs industry peers · Fliar Intelligence Index 14/100 | $47M | 7 mo ago | Public | 17 | 2005 | RequireJSHSTSOpen Graph | — | — |
| 5 | Achillion Pioneering new possibilities for the rare disease community through innovative science | $41M | 292 mo ago | Acquired | 2,372 | 1998 | — | 2 patents Antiviral hepatitis C therapeutics targeting viral replication | — |
| 6 | CHFA Provider of affordable housing finance solutions | $27M | 170 mo ago | Funding Raised | 134 | 1969 | Microsoft ASP.NETAlertifyJSAngularJS+12 | — | 2 job openings · 3 awards |
| 7 | Tangen Biosciences Developer of a molecular diagnostics platform | $24M | 36 mo ago | Series B | 10 | 2013 | — | — | — |
| 8 | Saphlux Developer of III-V Group-based semiconductor materials 40Talent top 15%Product top 25%Funding top 30%Moat top 32% All 9 signals ▾Talenttop 15% Producttop 25% Fundingtop 30% Moattop 32% Patentstop 38% Innovationtop 40% Techbottom 44% Globalbottom 40% Marketbottom 20% Talent: Analyst team rating 5/5 Product: 6 distinct product lines · Company stage: Series C rank vs industry peers · Fliar Intelligence Index 40/100 | $22M | 2 mo ago | Series C | 3 | 2014 | Cart FunctionalitySquarespace CommerceSquarespace+13 | 32 patents Patents concentrated in electrical & electronics | 1 partnership |
| 9 | GestVision Point of care diagnostic test for preeclampsia | $17M | 71 mo ago | Series B | 5 | 2014 | WixSentryBootstrap+7 | 30 patents Detection of misfolded proteins using immunoassay devices | — |
| 10 | DotLab Provider of a molecular diagnostic testing tool for endometriosis in women | $10M | 83 mo ago | Series A | 11 | 2016 | WebflowAmazon Web Servicescore-js+9 | — | — |
| 11 | Solais Lighting Manufacturer of smart LED lighting products | $9M | 77 mo ago | Acquired | 42 | 2008 | WordPressMySQLPHP+37 | 15 patents High‑efficiency LED lighting modules, drivers, and power‑supply conditioning for improved visual performance. | 1 launch |
| 12 | Noteworthy Offering cloud and AI-driven power line inspection solutions | $9M | 32 mo ago | Series A | 5 | 2020 | — | — | — |
| 13 | Upcycle Technologies Developer of a bio-asset recovery system for wet waste | $6M | 105 mo ago | Series A | 5 | 2006 | — | 4 patents Soil bio-nutrient formulations and slow‑release fertilizer technologies for enhanced microbial activity. | — |
| 14 | Artificial Cell Technologies Redefining vaccine manufacturing through rapid, synthetic, and personalized production | $6M | 144 mo ago | Funding Raised | 8 | 2006 | — | 118 patents Particle-based vaccine and drug delivery formulations using layer‑by‑layer coating technologies | — |
| 15 | SRS Provider of a platform for commercial property assessed clean energy programs | $4M | 149 mo ago | Seed | 11 | 2010 | — | 117 patents Real-time audio signal processing, adaptive object streaming, and immersive sound rendering | — |
| 16 | Intus Bio Developer of sequencing technology for microbiome testing, pathogen identification, and tracking | $3M | 13 mo ago | Seed | 9 | 2014 | — | — | — |
| 17 | Sustainable Real Estate Solutions Software for calculating energy saving as financial impacts | $3M | 165 mo ago | Seed | — | 2010 | — | — | — |
| 18 | CaroGen Corporation Immunotherapy company developing novel RNA-based artificial virus platform for infectious diseases | $2M | 30 mo ago | Series A | 8 | 2012 | — | — | — |
| 19 | Raise Green Developer of a crowdfunding platform for renewable energy and climate solution projects | $2M | 36 mo ago | Seed | 9 | 2011 | — | — | — |
| 20 | CarbonWave Provider of carbon capture solution | $2M | 23 mo ago | Seed | — | — | — | 5 patents Patents concentrated in health & consumer products | — |
| 21 | West Haven Housing Authority Operator of housing programs enhancing affordable living opportunities for families | $2M | 197 mo ago | Funding Raised | — | 2013 | — | — | — |
| 22 | EpitoGenesis Developing all-natural immune enhancing adjuvants and delivery systems for vaccines | $2M | 156 mo ago | Funding Raised | — | 2008 | — | 30 patents Natural‑product based immunomodulatory and antipathogen pharmaceutical adjuvant formulations | — |
| 23 | Enviro Power Online platform offering HVAC monitoring solutions | $2M | 37 mo ago | Series A | 24 | 2013 | — | — | — |
| 24 | Go Green Global Technologies Provider of water treatment solutions | $1M | 141 mo ago | Deadpooled | — | 2009 | — | — | — |
| 25 | Mutual Housing Provider of affordable housing, resident services, and community development programs | $998K | 134 mo ago | Funding Raised | — | 1988 | Concrete CMSPleskPHP+10 | — | — |
| 26 | Gynion Developer of therapeutic devices for women health applications | $969K | 13 mo ago | Funding Raised | 2 | 2019 | — | 14 patents Intrauterine drug delivery systems for localized therapeutic agent administration. | — |
| 27 | DiagMetrics Provider of mask-based diagnostic system to detect COVID-19 | $939K | 34 mo ago | Funding Raised | — | 2020 | — | 11 patents Patents concentrated in health & consumer products | — |
| 28 | Ellington Valley Technologies Developer of next-generation sampling methodologies for environmental applications and air toxics | $910K | 7 mo ago | Seed | — | 2024 | — | — | — |
| 29 | Curatix Developer of novel anti-fungal and anti-parasitic drugs and diagnostics | $594K | 38 mo ago | Funding Raised | — | 2021 | — | — | — |
| 30 | Green Buildings Provider of consulting services for green buildings projects | $450K | 162 mo ago | Seed | — | 2008 | — | — | — |
| 31 | Skyre Develops and manufactures products for energy and other industries | $380K | 98 mo ago | Seed | 19 19 → 22 (+16%) | 2007 | Cart FunctionalitySquarespace CommerceSquarespace+11 | 74 patents Electrochemical gas separation and production systems for H₂, O₂, and CO₂ | — |
| 32 | Shelton Housing Authority Operator of housing providing affordable and safe living environments for residents | $237K | 6 mo ago | Funding Raised | — | 2019 | — | — | — |
| 33 | MZ Diagnostics Developer of non-genotypic assays for the detection of antimicrobial resistance | $225K | 161 mo ago | Deadpooled | — | 2011 | — | 94 patents Molecular diagnostic assays using cooperative primers for allele-specific nucleic acid detection | — |
| 34 | USEngineering Solutions USEngineering Solutions Corp. Home Page | $200K | 185 mo ago | Funding Raised | 5 | 1998 | — | — | — |
| 35 | Meta Carbon Provider of solutions to reduce the carbon footprint | $100K | 48 mo ago | Seed | 6 | 2021 | — | — | — |
| 36 | Whether Offering AI-based solutions for weather forecasting | $100K | 59 mo ago | Seed | 2 | 2018 | — | — | — |
Top 12 Sustainability Tech companies in Connecticut
#1
Acquired · Shelton, Connecticut · founded 2007 · 103 employees$84.8Mraised▾
Provider of energy management solutions and services for buildings. It provides integrated light switches to monitor and control lighting loads, advanced power strips to monitor and control plug load at the workstation level, temperature sensors, and electrical panel-level monitoring devices to monitor load at each level and report back to central software. It caters to corporations, municipal governments, colleges, universities, and manufacturers.
- Mar 2026Conventional Debt$550M
- Jun 2025Conventional Debt$100M
- Jan 2024Conventional Debt$400M
- Oct 2020Series B$7.8M
#2
Series C · New Haven, Connecticut · founded 2014 · 3 employees$22Mraised▾
Developer of III-V Group-based semiconductor materials. It provides users with III-V Group-based semiconductor materials for fabricating semiconductor wafers or integrated circuits with a new base material which finds applications in improving LED technology and LED performance. It also provides a chip out which could reduce the cost of manufacturing LED-based lighting by 10 times.
- Apr 2026Series C$43.5M
- Dec 2022Series B$15.8M
- Mar 2017Series A$5M
- Jul 2015Seed$200K
#3
Public · West Haven, Connecticut · founded 2005 · 17 employees$47Mraised▾
NanoViricides discovers, develops and commercializes therapeutics to treat viral infections. Nanoviricide is an antiviral agent based on the TheraCour polymeric micelle technology. This is a biomimetic platform technology has enabled the Company to rapidly develop highly effective drug candidates against a number of viral diseases. Currently developing drugs against five diseases: FluCide, a single drug against all influenzas including pandemic viruses, bird flu (H5N1), and highly pathogenic strains; HIVCide, which was found to be so effective in SCID-hu mouse model studies that it is widely believed that it could result in a “functional cure” of HIV/AIDS; HerpeCide for oral and genital herpes; DengueCide, a single drug to combat all dengue virus types; and a broad-spectrum antiviral for infections of the external eye.
- Nov 2025Post IPO$6M
- Feb 2019Post IPO$2.5M
- Jan 2014Post IPO$20M
- Feb 2013Post IPO$6M
#4
Seed · Farmington, Connecticut · founded 2014 · 9 employees$3.1Mraised▾
Developer of sequencing technology for microbiome testing, pathogen identification, and tracking. It offers a platform, called Titan-1 which ses a patented 16S-ITS-23S amplicon to generate information to differentiate strains without sequencing the whole genome.
- May 2025Seed$1.1M
- Jun 2024Conventional Debt—
- Jun 2024Seed$2M
- Nov 2022Seed$1.1M
#5
Seed · Broad Brook, Connecticut · founded 2024$910Kraised▾
Developer of next-generation sampling methodologies for environmental applications and air toxics. The company focuses on creating sampling methodologies that can be coupled with analytical measurement technology. Its patent-pending technology enables customers to measure analytes at lower levels than currently achievable.
- Oct 2025Seed$910K
#6
Funding Raised · Shelton, Connecticut · founded 2019$237.4Kraised▾
Operator of housing providing affordable and safe living environments for residents. It offers housing options to mixed populations, including families, children, seniors, and persons with disabilities. The organization is governed by a board of commissioners, with meetings open to the public. It adheres to regulations and operates as an equal opportunity provider and employer.
- Dec 2025Grant (prize money)—
- Nov 2025Grant (prize money)$37.8K
- Jun 2025Grant (prize money)$37.8K
- May 2025Grant (prize money)$47.5K
#7
Funding Raised · Trumbull, Connecticut · founded 2019 · 2 employees$969.1Kraised▾
Developer of therapeutic devices for women health applications. The company's products include "Clarablex" a topical gel for multiple indications in gynecology, including the treatment of cervical intraepithelial neoplasia (CIN) to prevent cervical cancer and other diseases caused by human papillomavirus (HPV) and "Menorrx", which is a therapy for Heavy menstrual bleeding (HMB).
- May 2025Grant (prize money)$300.8K
- Sep 2024Grant (prize money)$367.5K
- Sep 2023Grant (prize money)$300.8K
#8
Series B · Branford, Connecticut · founded 2013 · 10 employees$24.3Mraised▾
Developer of a molecular diagnostics platform. The GeneSpark diagnostic instrument used for the detection of targeted DNAs and RNAs from specimens by using isothermal nucleic acid amplification. The company has a TangenDx assay based on GeneSpark is used for COVID, flu, yeast, bacterial, and AMR bloodstream infection.
- May 2023Series B$464.8K
- Aug 2020Series B$12.2M
- Jul 2020Series B$11.2M
- May 2020Grant (prize money)$3.3M
#9
Seed · Bethel, Connecticut$2Mraised▾
Provider of carbon capture solution
#10
Public · New Haven, Connecticut · founded 2000 · 162 employees$186Mraised▾
Developer of novel small-molecule antibiotics intended to focus on the treatment of resistant infections. The company develops treatments for bacterial infectious diseases, particularly respiratory tract infections and staphylococcal infections and is focused on treating community-acquired bacterial pneumonia, as well as gonorrhea and other indications, enabling clients to get safe and differentiated antibiotics for acute care.
#11
Series A · Stamford, Connecticut · founded 2020 · 5 employees$8.6Mraised▾
Offering cloud and AI-driven power line inspection solutions. Its sensors can be mounted on vehicles for real-time asset inspection. It offers Inspector Edge which uses existing fleet vehicles to inspect and inventory assets in the field, and Inspector Cloud which provides analytics solutions.
- Oct 2023Series A$5.6M
- Jul 2022Seed$3M
- Jun 2021Seed$1.9M
#12
Acquired · Greenwich, Connecticut · founded 1987 · 104 employees$120Mraised▾
Developer, investor, asset manager, and property manager of residential apartments. The firm focuses on development, equity investment, asset management, and property management activities. It has presence in both the luxury rental apartment and affordable housing sectors. The firm executes all phases of the businesses: land acquisition, governmental approvals and entitlements, design and construction, equity arrangement, and long term asset and property management. The objective is to create a residential experience for residents and optimize economic returns for developer clients, partners, and investors.
- Mar 2019Conventional Debt$120M
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.