Defense Tech Startups

A company providing analytical, modeling and simulation, and program support services, including support for naval expeditionary and EOD (explosive ordnance disposal) programs. It serves government and mission-oriented defense clients.

1 investor

European Space Ventures AG is a space-focused investment company that allocates capital from European investors to European space, deep tech, and defence ventures ranging from start-ups to SMEs. It also offers sector-specific investment expertise to the wider European investor community, with a stated emphasis on European sovereignty.

1 investor

SSCL provides independent third-party advisory and consulting services to defence and security stakeholders, focused on space operations for commercial, civil, and national security users. Its work covers operational research, capability-based planning, modeling and simulation, and concept development across the aerospace, near-space, and space domains.

1 investor

Space Protocol develops a decentralized operating system for space operations that provides real-time sensor calibration, satellite positioning, and orbital compliance monitoring. The platform enables autonomous satellites to sense, share, and react while delivering trustless data verification and risk quantification for space operators and defense agencies.

1 investor

Spear AI builds artificial intelligence solutions for maritime operations, turning sensor data into signals and decisions to help maritime operators act faster. It works with U.S. defense and intelligence organizations, applying acoustic intelligence to areas such as undersea warfare and submarine forces.

1 investor

Spherea provides test and simulation solutions to clients across multiple industries worldwide.

1 investor

Spiral Blue builds LiDAR Earth observation satellites to provide high-resolution data for national security, disaster response, climate mitigation, and insurance applications. The company develops the Space Edge Computer, a spacecraft payload, with multiple units already operational in orbit.

1 investor

Squadra is a seed-stage venture capital firm that provides hands-on operational support, network connections, and go-to-market help to early-stage startups. It has particular ties to the national security, defense, and cyber sectors.

1 investor

Squarehead Technology builds acoustic microphone arrays that passively detect threats and anomalies from sound, used for defense applications such as drone and rocket/artillery/mortar detection as well as industrial machinery monitoring and predictive maintenance. It serves military, security, and industrial customers in the acoustic sensing field.

1 investor

StandardAero is an independent maintenance, repair and overhaul (MRO) provider specializing in gas turbine engines, airframes, avionics, and components. It serves commercial aviation, business aviation, military, and industrial power customers, offering services such as engine health monitoring, mobile service teams, and STC certification.

1 investor

Starburst is a global accelerator dedicated to Aerospace & Defense startups, providing acceleration programs, consulting missions, private pitches and events. It connects startups with industrial partners and allied governments through a team present in nine countries.

1 investor

Starburst is an aerospace and defense innovation organization that combines a startup accelerator, strategy consulting, and venture investing to support companies from startup to Fortune 500. It advises aerospace firms and invests in deep tech areas such as electric flight, autonomous drones, urban air mobility, and national security.

1 investor

STAT-TIS builds rugged hardware, modular sensors, and software that convert physical military logistics into real-time machine-readable data on a single platform. Aimed at military commanders and units, it provides visibility over assets, maintenance, and supply for sustainment operations in contested environments.

1 investor

Project Omega recycles spent nuclear fuel and develops next-generation nuclear power systems for national security, energy independence, and waste remediation. The company builds portable power sources and fuel recycling infrastructure to meet growing U.S. energy demand.

1 investor

Stedfast manufactures coated and laminated protective barrier fabrics, including chemical and biological resistant materials, for first responders, medical PPE, industrial, and military applications. Founded in 1930, it produces high-performance protective fabrics such as CBRN protection layers and air-permeable particulate barriers.

1 investor

SteelMirror builds custom AI, computer vision, and robotics systems for industrial automation and government/security use cases, including factory automation, autonomous ground vehicles, threat-detection platforms, and regulatory compliance software. It serves manufacturers and federal/security projects, handling work from shop-floor audits and R&D through field deployment and maintenance.

1 investor

Stellant Systems designs and manufactures high-power RF amplification systems and components, including solid-state power amplifiers, traveling-wave tubes and amplifiers, klystrons, magnetrons, microwave power modules, and propulsion systems (XIPS). Its products serve defense, space, and industrial applications.

1 investor

Stendr is building defence technology that fuses data from disparate sensors to counter fast-moving threats such as drone swarms, aiming to give operators clearer, faster situational awareness. It positions itself as a Nordic defence company for mission-critical, high-consequence operations.

1 investor

StirlingX is a technology and operations company founded by veterans of UK military and intelligence units, emphasizing reliable systems, operational discipline, and rigorous security. The page describes the founders' background and approach but does not specify a concrete product or target customer.

1 investor

The Canadian Strategic Missions Corporation (CSMC) is a space and defence company developing dual-use technologies through two subsidiaries: CSMC Nuclear, which builds portable micro-nuclear reactors for remote environments, and CSMC Labs, an R&D division commercializing deep-tech in quantum, robotics, nano-materials, and space systems. Its nuclear reactors serve Canadian defence, Indigenous communities, and space exploration.

1 investor

Stratolia develops software for planning, operating, and supervising stratospheric balloon missions at altitudes of 15-35 km. The platform is designed for defense applications requiring sovereign capability, and serves research and telecommunications markets.

1 investor

STS Defense Solutions, a defense-focused division of STS Aviation Group, provides aircraft maintenance, modification, and sustainment (MRO) services for military fleets, working directly with prime contractors, OEMs, and government defense agencies. Its work spans flight-line and depot-level maintenance, avionics modernization, structural repair, and mission system integration across platforms in the U.S. and U.K.

1 investor

Sunvair is an international aerospace maintenance, repair, and overhaul (MRO) provider offering repair and engineering services for flight-critical components including avionics, hydraulics, landing gear, and electrical systems. It serves commercial airlines, militaries, OEMs, and other repair stations, with Parts Manufacturer Approval (PMA) and in-house Designated Engineering Representative (DER) capabilities.

1 investor

A company positioned around security and defense with a stated focus on Europe, though the page provides only high-level mission statements without concrete details on its products or services.

1 investor