Defense Tech Startups

Seitec builds Nightingale, a passive seismic and acoustic sensor network with on-device Edge-AI that detects, tracks, and classifies targets such as people, vehicles, aircraft, and ordnance without requiring line of sight. Its sensing platform is aimed at defence, law enforcement, corporate, agricultural, and infrastructure users.

2 investors

SensusQ builds a knowledge engine that provides real-time access to critical information to improve decision-making for defense and intelligence professionals, drawing on decades of military and intelligence experience.

2 investors

SFC Energy AG manufactures fuel cells, power supplies, and power management systems for clean energy, defense, and industrial applications. The company operates across clean energy solutions, tactical power systems, and semiconductor/laser power supplies from headquarters in Germany.

2 investors

Shearwater Aerospace develops intelligent drone systems designed for public safety, disaster response, and other applications where traditional aircraft use is costly or risky. The company's Smart Flight platform aims to enable faster, longer-range uncrewed operations while reducing greenhouse gas emissions compared to conventional aviation.

2 investors

SiFly builds NDAA-compliant, fully-electric VTOL drones with long endurance (over 2 hours in hover, 3 hours in forward flight) and heavy-lift capacity as an alternative to light utility helicopters. Its autonomous rotorcraft serve mapping, inspection, logistics, search & rescue, and public safety operations with onboard intelligence and remote-operation networking.

2 investors

Signum Technologies develops artificial intelligence and computer vision solutions in collaboration with U.S. National Laboratories and Federal Agencies to address critical challenges in healthcare, security, and national defense. The company commercializes advanced biosensor and imaging technologies originally developed for urgent public health and security needs.

2 investors

Silent Ventures is an early-stage venture capital firm that invests in founders building aerospace, defense, and national security companies. The firm focuses on concept-stage pre-seed and seed investments in the defense technology sector.

2 investors

SMG develops high-precision resonant MEMS inertial and gravity sensors, including accelerometers, gyroscopes, and the GAIA gravity system, spun out from Cambridge University research. Its sensors serve autonomous navigation, aerospace, defence, robotics, and geophysics/subsurface exploration applications.

2 investors

Simplesense builds a platform delivering "Continuous Mission Assurance" that provides unified visibility across installation infrastructure and security for defense installation leaders and operations centers. It serves military service branches, federal agencies, and critical infrastructure environments.

2 investors

Skapion develops a native counter-swarm air defense platform that integrates detection, interception, and command-and-control into a distributed, mobile architecture for intercepting multiple simultaneous aerial threats. The system is aimed at protecting allied military forces across domains.

2 investors

SKYDEX engineers patented impact-protection technology used across applications including footwear, fall protection, athletic gear, vehicle blast protection, and soldier body armor. It serves defense and military customers such as the U.S. Marine Corps, as well as industries like sports stadiums, film sets, and construction.

2 investors

Skydweller Aero develops and manufactures very large solar-powered, autonomous aircraft designed for perpetual uncrewed flight carrying heavy payloads, with applications including ISR and maritime patrol. The aerospace company serves defense and long-endurance surveillance markets and is headquartered in Oklahoma City with R&D facilities in Spain and Mississippi.

2 investors

SkyeBrowse is a 3D modeling platform using patented videogrammetry technology to convert video from drones, phones, and other devices into accurate 3D models in minutes. The platform serves public safety agencies, construction professionals, surveyors, and forensics teams who need rapid reality capture and spatial analysis.

2 investors

SMTC Corporation is a mid-size provider of end-to-end electronics manufacturing services (EMS), including PCBA production, systems integration, testing, enclosure fabrication, product design, sustaining engineering, and supply chain management. It serves global OEMs and emerging technology companies across market segments such as medical, semiconductor, retail and payment systems, test and measurement, industrial and clean tech, telecom, and defense and aerospace.

2 investors

Solafune is a company applying geospatial technology to address social, environmental, and industrial problems. It operates as a global team focused on satellite/geospatial data analysis.

2 investors

South 8 develops lithium-ion battery cells and electrolyte systems using patented liquefied gas electrolyte technology designed for extreme-temperature and defense applications. The company offers both direct-to-customer battery cells and an electrolyte injection system for cell manufacturers.

2 investors

Sovereign.ai develops Aurora, an intelligence software platform that processes and analyzes structured and unstructured data from multiple sources using artificial intelligence, natural language processing, and graph theory analysis. The platform serves organizations requiring advanced data contextualization and analytics across complex information ecosystems.

2 investors

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.

2 investors

Squire Solutions develops a smart digital assistant platform for military and first responders that improves information flow and communication in field operations. The system uses voice-based technology and data synchronization to reduce coordination time for critical tasks like medical evacuation operations.

2 investors

Starling Systems develops fixed-wing electric vertical take-off and landing (eVTOL) drones for defense and military applications. The company focuses on aerodynamic efficiency and reliability for demanding missions requiring advanced unmanned flight capabilities.

2 investors

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.

2 investors

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.

2 investors

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.

2 investors

Strider provides data and analytical services to identify organizations connected to strategic infrastructure projects and reveal links between commercial entities and government/military actors, particularly focused on People's Republic of China activities in Latin America and the Caribbean.

2 investors