Best Nuclear Energy Companies in United Kingdom
The 32 best Nuclear Energy companies in United Kingdom in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: First Light Fusion.
Ranked: Best Nuclear Energy companies in United Kingdom
| # | Company | Disclosed funding | Last round | Employees | Founded | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3T Safety Consultants Provider of nuclear safety and risk management services | — | — | — | 2008 | Brenda Butts Owner | — | — | — |
| 2 | Aquilaeurope Provider of engineering and project management solutions for the nuclear sector | — | — | 72 | 2010 | — | — | — | — |
| 3 | Cavendish Nuclear Nuclear project development, installation and decommissioning services provider | — | — | 917 | 2013 | Corfield Steve CEO | WordPress Block EditorWordPressMySQL+22 | 33 patents Ultrasonic nondestructive testing probes for weld inspection and quality control | — |
| 4 | Doosan Babcock EPC and asset management services provider for nuclear, thermal & petroleum indsutries | — | — | 2,953 | 1891 | — | — | 146 patents Power plant boiler systems and pipe integrity inspection/testing technologies | — |
| 5 | Fusion Reactors Provider of nuclear fusion reactors for sustainable energy generation | — | — | 1 | 2019 | Christos Stavrou CEO | — | 2 patents Neutral beam injection systems for plasma heating in fusion reactors | — |
| 6 | Gridfire Fusion Developer of nuclear fusion technology to accelerate humanity’s race forward | — | — | — | 2025 | David Peto Co-Founder & CEO | — | — | — |
| 7 | Horizon Nuclear Power ABWR based Nuclear Energy plant developers | — | — | 51 | 2009 | — | — | — | — |
| 8 | JGC Developer of nuclear energy projects | — | — | 78 | 1972 | — | — | — | — |
Top 12 Nuclear Energy companies in United Kingdom
#1
Series C · Oxford, England · founded 2011 · 66 employees$105.4Mraised▾
First Light is developing a nuclear fusion process based on inertial confinement fusion. The process involves symmetrical implosion reaction of the helium produced from water which claims to produce a temperature that of the sun core. This heat energy is then utilized for power production.
- Apr 2026Series C$33.8M
- Feb 2022Series C$45M
- Dec 2020Series B$25M
- Aug 2015Series B$35.4M
#2
Series B · Edinburgh, Scotland · founded 2023 · 15 employees$45Mraised▾
Producer of nuclear energy. Company components are prefabricated in the shipyard environment before being transported to their final locations for assembly. Company builds plants in shipyards, which are centralized locations equipped with permanent workforces and automated machinery.
- Apr 2026Series B$380M
- Oct 2024Series A$45M
#3
Series C · Abingdon, Oxfordshire · founded 2009$87Mraised▾
Tokamak Energy is a company focused on developing technology to commercialize clean and secure fusion energy, along with high temperature superconducting magnet technology. They are pioneers in the field of fusion energy and are at the forefront of developing new technologies and ideas.
- Nov 2024Series C$125M
- Sep 2020Grant (prize money)$580K
- Jan 2020Series B$87M
- Dec 2018Series A—
#4
Seed · Culham, England · founded 2024$615.2Kraised▾
Provider of engineering solutions and services. It is a microwave technology company designing and operating microwave systems on fusion devices. It offers high-power microwave systems from GHz to THz frequencies. It specializes with a focus on scientific, technical, or energy-related fields.
- Jan 2026Seed$615.2K
#5
Funding Raised · Sheffield, England · founded 2009 · 107 employees$10.5Mraised▾
Provider of advanced manufacturing research and development for the nuclear sector. It develops new techniques, optimizes processes, and pioneers new technologies for nuclear energy. The organization focuses on advancements, innovations, and breakthroughs in nuclear research and development.
- Aug 2022Grant (prize money)$1.5M
- Aug 2020Grant (prize money)$9M
#6
Seed · Glasgow, Scotland · founded 2016 · 3 employees$788.5Kraised▾
Provider of solutions for nuclear waste recycling. It uses a muon imaging system to analyze intermediate-level nuclear waste drums.
- Nov 2022Seed$788.5K
#7
Seed · London, Gloucestershire · founded 2019 · 4 employees$421.7Kraised▾
Developer of novel compact fusion reactor intended for carbon-free heat and power generation. The company utilizes nuclear fusion for a safe and clean solution that uses safe fuels that can be made from water and is exploring its uses in developing hydrogen isotope separation as part of the fusion fuel cycle, enabling the scientific community with the research of new approach to building fusion reactors based on patented technology.
- Apr 2020Seed$282.7K
- Apr 2020Seed$139K
#8
Funding Raised · Warrington, England · founded 2008$145.1Kraised▾
Provider of technical solutions across the complete nuclear fuel cycle. The organization offers advice, products, and services supporting fuel manufacture and power generation. It also focuses on reprocessing, waste treatment, and disposal. The company coordinates research and development and maintains connections with academia and industry. It supports government in safeguarding skills and capabilities.
- Jun 2019Grant (prize money)$145.1K
- Sep 2017Grant (prize money)—
#9
Seed · United Kingdom · founded 2021 · 637 employees—raised▾
Just a moment...
- Mar 2025Seed—
#10
Seed · Bristol, Bristol—raised▾
Developer of fusion systems for medical isotope production and research. The company provides fusion reactor testbeds for equipment calibration and material testing. It offers a research platform to accelerate discoveries. The systems are designed for medical, industrial, and research applications.
#11
Funding Raised · Bletchley, England · founded 2014—raised▾
Provider of plasma-propelled nuclear fusion energy. It provides PLSR orbital satellite engine, PLSR advanced heated ignition cathodes and PLSR high energy launch thruster. Additionally, it provides plasma-facing components, plasma control & confinement analysis solutions, and more.
- Nov 2021Grant (prize money)—
#12
Funding Raised · Warrington, England · founded 1999 · 1128 employees—raised▾
Welcome to National Nuclear Laboratory's Linked In page We play a key role in the UK and global nuclear industry. That means reducing the cost of clean-up and decommissioning, maintaining critical skills and attracting talented new people to the industry. We're the only UK organisation with the skills, facilities and expertise to provide technical support to all aspects of the nuclear industry. What's more, we pride ourselves on offering quality, value and service to every one of our customers.
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Nuclear Energy coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Nuclear / Small Modular Reactors is moving in the United Kingdom
A read on the academic research around Nuclear / Small Modular Reactors — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 227 United Kingdom-affiliated papers.
- Imperial College London30
- University of Liverpool27
- National Nuclear Laboratory24
- University of Manchester16
- University of Cambridge16
- Nuclear engineering4→11
- Nuclear reactor2→8
- Molten salt1→5
- Nuclear data1→4
- Neutron1→4
- Molten salt2→13
- Nuclear reactor4→13
- Nuclear engineering9→18
- Molten salt reactor1→10
- Neutron1→8
- Nuclear reactor5→8
- Nuclear data1→4
- Spent nuclear fuel2→4
- Nuclear power4→5
Where nuclear smr is researched across United Kingdom
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 nuclear smr patents in the United Kingdom
United Kingdom nuclear smr patent filing is accelerating — 588 filings from 157 assignees (2016–2025), led by Rolls Royce, Rolls Royce SMR, Scott IAN Richard; annual filings 24→80.
- Rolls Royce114
- Rolls Royce SMR110
- Scott IAN Richard90
- Rolls Royce Power ENG62
- Rolls Royce Submarines57
- BAE Systems40
- Johnson Matthey22
- United Kingdom Atomic Energy Aut20
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.