Greenjets
Greenjets was founded in 2022 by chief executive Anmol Manohar and chief technology officer Dr Guido Monterzino, and builds propulsion for uncrewed and electric aircraft, with a portfolio running from electric ducted fans to geared turbofan engines. Products include the Sycamore 160 and Aspen 212, designed for higher efficiency, greater speed and a lower acoustic signature than conventional designs, and the team draws on Rolls-Royce, General Electric, BAE Systems and Formula 1 experience. The company sells to NATO, the UK MoD and the German MoD, and was selected under the MoD's Low-Cost Air Defence Effectors programme to build a British low-cost drone interceptor. It grew from 160 to more than 250 staff and expanded UK facilities from 12,000 to nearly 70,000 square feet. The $40M Series A was led by Blossom Capital, with the NATO Innovation Fund, the National Security Strategic Investment Fund, Tanglin Ventures and NSFO Family Office.
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QuadSAT
QuadSAT is a Denmark-based defence technology company founded in 2017 by Joakim Espeland (CEO) and Andrian Buchi (CTO), who met as mechanical engineering students at VIA University College. Espeland, a Norwegian RF engineer with five years of experience in maritime satellite communications, identified inefficiencies in satellite antenna testing that required expensive ship deployments. The company develops drone-based RF measurement and antenna testing systems, with traction including operational campaigns with OneWeb and the European Space Agency. QuadSAT maintains a UK registered office in London to serve NATO-aligned defence customers across Europe. The company raised €9M in Series A funding led by IQ Capital in 2023, followed by a €5M extension in 2025 led by Join Capital and North Ventures.
Arondite
Arondite is a London-based defence technology company building foundational software and AI to power the autonomous age. The company develops a platform that connects disparate autonomous systems, such as drones, ground robots, and AI-powered sensors from any manufacturer, giving human operators clearer oversight and safer operational control. Founded by former Palantir and Helsing veteran Will Blyth and ex-BAE Systems engineer Rob Underhill, the company addresses the growing need for interoperability as militaries adopt a proliferation of new autonomous hardware across the battlefield.
Grayscale AI
Grayscale AI is a London-based startup founded in 2020 by Dragos Stanciu, developing neuromorphic AI systems that mimic human neural networks for autonomous drones, robots, and vehicle navigation. Drawing on computational neuroscience research from the University of Edinburgh and ETH Zurich, the company's technology delivers up to 500x greater energy efficiency than traditional computing with edge processing under 100 milliseconds. Grayscale AI has validated its technology through partnerships with HORIBA MIRA, AVL, and Smart Mobility Living Lab London. The company participates in NATO's DIANA accelerator programme and has received grant funding from Innovate UK and the US Army xTech programme, alongside backing from Techstars.
Overwatch
Overwatch Group is an independent British defence company that designs, engineers, and manufactures unmanned aerial systems and precision strike munitions. Founded in 2020 by British forces veterans and headquartered in Wolverhampton, the company builds agile defence technology including the Pholos pack-portable UAS and loitering munitions with kinetic payloads. Overwatch has delivered approximately 800 systems since 2022 and operates with a team of around 30 personnel. The company is self-funded with no disclosed external investment rounds, led by CEO Drew Michael.