4909 indexable Environment Tech companies headquartered in United States, ranked by total equity funding and recent funding momentum. Combined disclosed equity funding of $67.1B across 1788 funded companies, including 23 unicorns.
| # | Company | Funding | Valuation | Stage | Latest round | Employees | Founded | Momentum |
|---|---|---|---|---|---|---|---|---|
| 1 |
Nexamp
Unicorn Provider of community solar programs and energy solutions for businesses |
$1.3B | $1B as of 2024 |
Series E | Conventional Debt Apr 2026 | 331 | 2007 | ↑ Active |
| 2 |
Redwood Materials
Unicorn Provider of repurposed battery packs for modular energy storage systems |
$1.9B | $5B as of 2023 |
Series E | Series E Jan 2026 | 516 | 2017 | ↑ Active |
| 3 |
Gradiant
Unicorn Provider of industrial water treatment solutions and technologies |
$400M | $1B as of 2023 |
Series E | Series E May 2026 | 900 | 2013 | ↑ Active |
| 4 |
LanzaTech
Unicorn Developer of technology converting carbon-rich gases into fuels and chemicals |
$869.3M | $1B as of 2019 |
Public | Post IPO Jan 2026 | 367 | 2005 | ↑ Active |
| 5 |
Tomorrow.io
Unicorn AI-powered weather intelligence platform using satellites for real-time forecasting |
$250M | — | Series F | Series F May 2026 | 124 | 2016 | ↑ Active |
| 6 |
Fervo Energy
Developer of next-generation geothermal projects delivering carbon-free energy |
$420.2M | — | Public | Conventional Debt Mar 2026 | 49 | 2017 | ↑ Active |
| 7 |
Divert
Provider of recyclable waste management services |
$1B | — | Series B | Series B Jan 2026 | 250 | 2005 | ↑ Active |
| 8 |
Persefoni
Provider of carbon accounting and sustainability management platform for businesses |
$170.7M | — | Series C | Series C Apr 2026 | 295 | 2020 | ↑ Active |
| 9 |
Clean Capital
Online platform for funding solar projects |
$503.9M | — | Series B | Conventional Debt Jan 2026 | 30 | 2015 | ↑ Active |
| 10 |
VoltaGrid
AI and cloud-driven platform offering microgrids to provide electricity to off-grid areas |
$100M | — | Series D | Series D May 2026 | 44 | 2020 | ↑ Active |
| 11 |
Ascent Solar
Manufacturer of flexible thin-film solar panels for varied applications |
$265.2M | — | Public | Post IPO Jan 2026 | 16 | 2005 | ↑ Active |
| 12 |
Frore Systems
Developer of thermal management solutions for data centers and electronic devices |
$190M | — | Series D | Series D Mar 2026 | 75 | 2018 | ↑ Active |
| 13 |
Switched Source
Developer of hardware-based system for distributed energy resources |
$66.7M | — | Seed | Seed May 2026 | 8 | 2016 | ↑ Active |
| 14 |
SPAN
Smart energy management technology platform that modernizes residential electrical systems |
$231M | — | Series C | Series C Jan 2026 | 220 | 2014 | ↑ Active |
| 15 |
GridCARE
Provider of AI data center power solutions leveraging existing grid infrastructure |
$77.5M | — | Series A | Series A May 2026 | — | 2024 | ↑ Active |
| 16 |
Sense
Smart energy platform providing real-time electricity usage insights for homes and utilities |
$194.6M | — | Series D | Series D Jan 2026 | 120 | 2013 | ↑ Active |
| 17 |
Nth Cycle
Provider of electronics and li-ion battery recycling technology |
$59.7M | — | Series B | Series B Apr 2026 | 37 | 2017 | ↑ Active |
| 18 |
Budderfly
Provider of energy management solutions and services for buildings |
$84.8M | — | Acquired | Conventional Debt Mar 2026 | 103 | 2007 | ↑ Active |
| 19 |
Torus
Manufacturer of power generators and energy management app |
$67M | — | Series D | Conventional Debt May 2026 | 1 | 2021 | ↑ Active |
| 20 |
Living Carbon
Provider of biotechnology based carbon storage solutions |
$36M | — | Series A | Series A Apr 2026 | 25 | 2019 | ↑ Active |
| 21 |
Utility Global
Provider of solutions to convert waste gas into hydrogen and syngas |
$86M | — | Series D | Series D Feb 2026 | 4 | 2018 | ↑ Active |
| 22 |
Watershed
Unicorn Provider of platform for enterprise sustainability programs, measurement, reporting, and action |
$170.5M | $1B as of 2022 |
Series C | Series C Dec 2025 | 225 | 2019 | ↑ Active |
| 23 |
M2X Energy
Provider of mobile methane-to-methanol conversion systems |
$60M | — | Series B | Series B Feb 2026 | 16 | 2020 | ↑ Active |
| 24 |
SmartAC.com
Provider of a platform for HVAC membership program management and growth |
$38.6M | — | Series B | Series B Mar 2026 | 34 | 2003 | ↑ Active |
| 25 |
Tantalus
Communication technology provider for smart grids |
$58.7M | — | Public | Post IPO Feb 2026 | 42 | 1989 | ↑ Active |
| 26 |
Trillium Renewable Chemicals
Manufacturer of green acrylonitrile and acetonitrile from biorenewable feedstocks |
$21.9M | — | Series B | Series B May 2026 | 3 | 2021 | ↑ Active |
| 27 |
Verdigris
AI and SaaS-driven energy analytics platform for the management of facilities and commercial buildings |
$41.7M | — | Series B | Series B Mar 2026 | 27 | 2011 | ↑ Active |
| 28 |
Redaptive
Unicorn Provider of fully-funded energy efficiency and sustainability solutions. It offers end-to-end services, including financing, expertise, and project management, to implement energy-saving and renewable upgrades across multiple sites. This allows clients to focus on their core business while achieving OPEX reduction and meeting ESG goals. Services encompass real-time data monitoring, enabling performance analysis and sustainability reporting, along with flexible financing options. The company's approach facilitates faster and larger-scale implementation of sustainability initiatives than clients could achieve independently. |
$726.5M | $1B as of 2022 |
Series E | Conventional Debt May 2025 | 326 | 2015 | ↑ Active |
| 29 |
Noveon
Provider of magnet recycling solutions |
$75M | — | Series C | Series C Jan 2026 | 12 | 2021 | ↑ Active |
| 30 |
Emerald
Developer of a platform optimizing power grids and artificial intelligence infrastructure |
$66.5M | — | Seed | Seed Feb 2026 | — | 2024 | ↑ Active |
| 31 |
NanoH2O
Developer of reverse osmosis membranes for water treatment |
$89.9M | — | Acquired | Series D Dec 2025 | 120 | 2005 | ↑ Active |
| 32 |
Allonnia
Provider of solutions for upcycling plastic waste |
$90M | — | Series A | Series A Dec 2025 | 16 | 2019 | ↑ Active |
| 33 |
Rebound
Developer of industrial cooling technology with built-in energy storage |
$17.9M | — | Series A | Series A Apr 2026 | 7 | 2012 | ↑ Active |
| 34 |
Saphlux
Developer of III-V Group-based semiconductor materials |
$22M | — | Series C | Series C Apr 2026 | 3 | 2014 | ↑ Active |
| 35 |
Ascend Elements
Unicorn Manufacturer of engineered materials from recycled lithium-ion batteries and battery scrap |
$1B | $1.4B as of 2023 |
Series D | Grant (prize money) Feb 2025 | 87 | 2015 | ↑ Active |
| 36 |
Terraform Industries
Developer of natural gas from carbon capture technology |
$37.7M | — | Series A | Series A Mar 2026 | 9 | 2021 | ↑ Active |
| 37 |
HELIXintel
Provider of SaaS-driven maintenance management software for commercial spaces |
$21.4M | — | Series A | Conventional Debt Mar 2026 | 28 | 2019 | ↑ Active |
| 38 |
Sage Geosystems
Developer of geo-thermal energy projects |
$56.8M | — | Series B | Series B Jan 2026 | 9 | 2020 | ↑ Active |
| 39 |
Ardent
Technology solution for carbon capture |
$74.3M | — | Series B | Series B Nov 2025 | 20 | 1993 | ↑ Active |
| 40 |
Lancium
Developer of infrastructure for artificial intelligence data centers and power orchestration |
$150M | — | Series D | Conventional Debt Oct 2025 | 80 | 2014 | ↑ Active |
| 41 |
Form Energy
Clean energy technology platform developing long-duration iron-air battery systems |
$1.1B | — | Series F | Series F Jan 2025 | 372 | 2009 | ↑ Active |
| 42 |
Radiant Nuclear
Unicorn Developer of portable nuclear microreactors designed to replace diesel generators |
$55M | — | Series D | Series D Dec 2025 | 34 | 2019 | ↑ Active |
| 43 |
TrashieCash
Provider of textile recycling services for clothing and household items |
$10M | — | Series A | Series A 2026 | — | 2023 | ↑ Active |
| 44 |
GridPoint
Provider of data-driven energy management solutions |
$539.3M | — | Acquired | Series G Mar 2025 | 192 | 2003 | ↑ Active |
| 45 |
Mainspring Energy
Developer of onsite linear power generators |
$518M | — | Series F | Series F Apr 2025 | 114 | 2010 | ↑ Active |
| 46 |
Twelve
Developer of carbon transformation technology producing fuels and feedstock products |
$387.4M | — | Series C | Series C May 2025 | 232 | 2015 | ↑ Active |
| 47 |
Star Catcher
Space-based energy grid solutions for space operations |
$12.2M | — | Series A | Series A May 2026 | — | 2024 | ↑ Active |
| 48 |
Halcyon
Provider of AI-assisted search and information platform for energy professionals |
$31.8M | — | Series A | Series A Feb 2026 | — | 2021 | ↑ Active |
| 49 |
Aether Fuels
Developer of technology converting waste carbon into sustainable liquid fuels |
$45.4M | — | Series A | Series A Jan 2026 | — | 2022 | ↑ Active |
| 50 |
NovaSolix
Developer of rectenna-based solar technology for various applications and sectors |
$16.1M | — | Series C | Series C Apr 2026 | 12 | 2015 | ↑ Active |
Provider of community solar programs and energy solutions for businesses. It offers community solar subscriptions, enabling savings on electricity costs without rooftop panels. It delivers energy storage solutions and power purchase agreements for commercial users. It also offers community solar programs with no rooftop panels, sign-up fees, or long-term contracts, enabling savings on electricity costs. It focuses on
Provider of repurposed battery packs for modular energy storage systems. It offers energy solutions by repurposing used battery packs into modular energy storage systems. The company recycles and refines lithium-ion batteries, recovering valuable materials. It focuses on creating scalable energy storage solutions by utilizing battery packs with remaining capacity. The company provides an alternative to traditional gr
Provider of industrial water treatment solutions and technologies. It offers end-to-end, turnkey treatment systems engineered to meet specific customer requirements. Services include water reduction, reclamation, and renewal, recovering valuable resources from wastewater. Custom chemical formulations are developed in-house to support these technologies. The company's solutions address various industrial sectors, focu
Developer of technology converting carbon-rich gases into fuels and chemicals. The company provides solutions for energy security and economic strength. It transforms industrial emissions and gasified waste into ethanol. This ethanol serves as a building block for sustainable aviation fuel and chemical derivatives. The company partners with industries to capture and process carbon-rich gases.
AI-powered weather intelligence platform using satellites for real-time forecasting. It combines satellite data, machine learning, and real-time atmospheric modeling to deliver hyperlocal forecasts and predictive insights. It helps industries like aviation, energy, logistics, and insurance anticipate weather risks and automate operational decisions.
Developer of next-generation geothermal projects delivering carbon-free energy. It pioneers a new approach to geothermal energy using technologies like horizontal drilling and distributed fiber optic sensing to unlock geothermal resources. It focuses on making geothermal energy a scalable resource and ensures environmental health and safety in its operations. The company aims to decarbonize challenging parts of the e
Provider of recyclable waste management services
Provider of carbon accounting and sustainability management platform for businesses. The platform offers tools for carbon footprint measurement, analytics, and sustainability reporting. It supports regulatory emissions reporting, stakeholder emissions reporting, and decarbonization management. The platform also provides features for scope 3 supplier engagement and financed emissions accounting. It includes AI-powered
Online platform for funding solar projects. It is financing and investing entity that offers a platform for individual investors as well as institutional investors to invest in clean energy projects. It identifies, screens, and manages clean energy projects for its investors. Additionally, it offers both equity and debt investments in operating clean energy projects.
AI and cloud-driven platform offering microgrids to provide electricity to off-grid areas. It offers solutions that include trailer-mounted custom-engineered switchgear, trailer-mounted Genset, and trailer-mounted energy storage system. The AI-driven platform allows users to track emissions, costs, power usage, equipment diagnostics, equipment operation, and more.
Manufacturer of flexible thin-film solar panels for varied applications. These photovoltaic modules are suitable for airborne vehicles, space missions, and agrivoltaic installations. The company utilizes CIGS chemistries with roll-to-roll manufacturing processes. The panels are built on a thin polyamide substrate.
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.
Rankings are computed by Radar (Fliar BI) from the Radar company master and are updated periodically. Funding and momentum scores use disclosed equity-funding data only. Figures may lag private rounds. Last updated 2026-06-16.
