Y Combinator companies
The Y Combinator portfolio as the radar sees it: synced daily, classified into clusters, checked for life and movement. 6,198 companies.
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| Earendil Robotics Drone swarm defence at a small-unit level | Defense and spacecounter-drone swarm systems | Y CombinatorS26 | Active | checked 2026-08-23 |
| Exosat Building a sovereign Starlink | Defense and spacesovereign satellite constellation | Y CombinatorS26 | Active | checked 2026-08-23 |
| Greypoint IndustriesAI Building drone swarms that hunt drone operators | Defense and spaceautonomous drone swarm warfare | Y CombinatorS26 | Active | checked 2026-08-23 |
| GUILDAI Making aerospace parts faster and cheaper for defense | Defense and spaceAI-automated aerospace manufacturing for defense | Y CombinatorS26 | Active | checked 2026-08-23 |
| Hop Aero Rocket cargo delivery to contested environments | Defense and spacehypersonic rocket cargo delivery | Y CombinatorS26 | Active | checked 2026-08-23 |
| IMPACT DronesAI Air Defense as a Service for Civilian Infrastructure. | Defense and spaceautonomous air defense drones | Y CombinatorS26 | Active | checked 2026-08-23 |
| Isengard Industries IncAI Mass-produced AI strike systems and Counter-UAS | Defense and spaceautonomous strike and counter-UAS systems | Y CombinatorS26 | Active | checked 2026-08-23 |
| Mass Magnetics USA-made magnetics for aerospace, robotics, and defense. | Defense and spaceDomestic rare-earth magnets for defense | Y CombinatorS26 | Active | checked 2026-08-23 |
| Vernius Systems, Inc. Autonomous radar guidance for interceptors | Defense and spaceautonomous radar guidance systems | Y CombinatorS26 | Active | checked 2026-08-23 |
| 9 Mothers Counter Drone Systems. $1.6m sales. We delivered for the DoW. | Defense and spaceautonomous counter-drone systems | Y CombinatorX26 | Active | checked 2026-08-23 |
| AICE Submarine drones for defense | Defense and spaceAutonomous underwater defense drones | Y CombinatorX26 | Active | checked 2026-08-23 |
| Arlo Industries Track drones and missiles without radars - Accurate, Passive, Scalable | Defense and spacepassive drone and missile tracking network | Y CombinatorX26 | Active | checked 2026-08-23 |
| Dispatch Satellites for Manufacturing in Space | Defense and spacereusable space logistics for manufacturing | Y CombinatorX26 | Active | checked 2026-08-23 |
| General Aviation Fix ATC by connecting aircraft to the internet | Defense and spaceaviation communication infrastructure | Y CombinatorX26 | Active | checked 2026-08-23 |
| Maquoketa ResearchAI The intelligence layer for drones | Defense and spacedrone intelligence software | Y CombinatorX26 | Active | checked 2026-08-23 |
| Nine Fives RF test equipment for next-gen spacecraft, drones, and cellphones | Defense and spaceRF test equipment for aerospace and telecom | Y CombinatorX26 | Active | checked 2026-08-23 |
| Ornadyne We're building robot birds for surveillance. | Defense and spacebiomimetic surveillance drones | Y CombinatorX26 | Active | checked 2026-08-23 |
| Surtr Defense Systems The hardware-agnostic operating system for drone defense | Defense and spaceCounter-UAS OS and threat fusion | Y CombinatorX26 | Active | checked 2026-08-23 |
| Tenet Industries Low-cost, mass-producible defense systems | Defense and spacemass-producible attack drones | Y CombinatorX26 | Active | checked 2026-08-23 |
| Beyond Reach Labs Space solar arrays that grow to the size of a football field in orbit | Defense and spaceSpace solar power generation | Y CombinatorW26 | Active | checked 2026-08-23 |
| Constellation SpaceAI AI operating system for mega-scale satellite networks. | Defense and spacesatellite network orchestration | Y CombinatorW26 | Active | checked 2026-08-23 |
| Galactic Resource Utilization Space, Inc. (GRU Space) Moon Hotel -> The Intergalactic Construction Company of Earth | Defense and spacelunar infrastructure and construction | Y CombinatorW26 | Active | checked 2026-08-23 |
| Milliray Technology to detect and track small drones | Defense and spacedrone detection radar systems | Y CombinatorW26 | Active | checked 2026-08-23 |
| Seeing SystemsAI Modular AI-Commanded Drones for Defence | Defense and spaceAI-commanded autonomous strike drones | Y CombinatorW26 | Active | checked 2026-08-23 |
| Icarus Stratospheric birds for defense | Defense and spaceautonomous stratospheric surveillance aircraft | Y CombinatorF25 | Active | checked 2026-08-23 |
| LakoniaAI Delivering AI-powered situational awareness in tactical environments. | Defense and spaceAI command and control for tactical ops | Y CombinatorF25 | Active | checked 2026-08-23 |
| Null Labs End-to-end Simulation for Defense Autonomy | Defense and spaceautonomous systems simulation | Y CombinatorF25 | Active | checked 2026-08-23 |
| Wardstone The Modular Interceptor Platform | Defense and spaceLow-cost modular air defense interceptors | Y CombinatorF25 | Active, new domain | 2026-08-23 |
| Zephyr Fusion Powering tomorrow's industrial revolution in space | Defense and spacein-orbit fusion power for space industry | Y CombinatorF25 | Active | checked 2026-08-23 |
| Albacore Inc. Drone submarines | Defense and spaceautonomous underwater drone systems | Y CombinatorS25 | Active | checked 2026-08-23 |
| Perseus Defense America's Golden Dome for Drones | Defense and spacecounter-UAS defense systems | Y CombinatorS25 | Active | checked 2026-08-23 |
| Cascade Space Commercial alternative to the Deep Space Network | Defense and spaceCommercial deep space ground stations | Y CombinatorX25 | Active | checked 2026-08-23 |
| Enhanced RadarAI AI for air traffic control | Defense and spaceAI air traffic control systems | Y CombinatorW25 | Active | checked 2026-08-23 |
| Instinct Space Building lunar landers | Defense and spacelunar lander hardware | Y CombinatorW25 | Active | checked 2026-08-23 |
| Orbital Operations High Thrust Space Vehicles for Satellite Defense | Defense and spacesatellite defense vehicles | Y CombinatorW25 | Active | checked 2026-08-23 |
| Reditus Space Reusable Satellites | Defense and spaceReusable orbital platforms | Y CombinatorW25 | Active | checked 2026-08-23 |
| Splash Inc. Autonomous patrol-boats for National Security | Defense and spaceautonomous patrol vessels for national security | Y CombinatorW25 | Active | checked 2026-08-23 |
| Apolink 24/7 satellite connectivity in low Earth orbit | Defense and spacesatellite connectivity infrastructure | Y CombinatorF24 | Active | checked 2026-08-23 |
| Ares Industries Building low-cost cruise missiles | Defense and spacecruise missile manufacturing | Y CombinatorS24 | Active | checked 2026-08-23 |
| Guardian RF Drone detection for US defense and national security | Defense and spacedrone detection and counter-UAS | Y CombinatorS24 | Active | checked 2026-08-23 |
| Theseus GPS Denied Navigation for Drones | Defense and spaceGPS-denied drone navigation | Y CombinatorS24 | Active | checked 2026-08-23 |
| UsulAI AI Platform for Winning Defense & Government Contracts | Defense and spaceAI contract matching for government | Y CombinatorS24 | Active | checked 2026-08-23 |
| BasaltAI Constellations as a Service | Defense and spaceAI-controlled satellite constellations | Y CombinatorW24 | Active | checked 2026-08-23 |
| DeepnightAI Building The Next Generation of Night Vision Devices | Defense and spaceAI-enhanced night vision devices | Y CombinatorW24 | Active, new domain | 2026-08-23 |
| EdgeTraceAI Describe It. Find It. Act On It. | Defense and spaceAI-powered video intelligence for public safety | Y CombinatorW24 | Active | checked 2026-08-23 |
| Elodin Unified flight software and hardware for the mission of tomorrow | Defense and spaceFlight software and hardware for drones and satellites | Y CombinatorW24 | Active | checked 2026-08-23 |
| Singularity Building and Protecting an Exciting Future | Defense and spacecounter-weapon defense systems | Y CombinatorS23 | Active | checked 2026-08-23 |
| Radical Building persistent, high-performance infrastructure in the sky | Defense and spaceHigh-altitude autonomous platforms | Y CombinatorW23 | Active | checked 2026-08-23 |
| Array Labs We're building satellites to create a real-time 3D map of the world. | Defense and spacesatellite imaging and earth observation | Y CombinatorS22 | Active | checked 2026-08-23 |
| Quindar Datadog for Space | Defense and spacesatellite constellation management SaaS | Y CombinatorS22 | Active | checked 2026-08-23 |
| Velontra Hypersonic space plane that can take-off from any location and weather | Defense and spacehypersonic space launch vehicles | Y CombinatorS22 | Active | checked 2026-08-23 |
| AstroForge We Mine Asteroids | Defense and spaceasteroid mining and space resources | Y CombinatorW22 | Active, new domain | 2026-08-23 |
| Hubble Network Bluetooth to Space | Defense and spacesatellite connectivity infrastructure | Y CombinatorW22 | Active | checked 2026-08-23 |
| Palitronica Inc Detect cyber attacks on critical physical infrastructure | Defense and spaceCritical infrastructure cyber defense | Y CombinatorW22 | Active | checked 2026-08-24 |
| RowndAI Fully autonomous defense solutions for the global edge. | Defense and spaceautonomous defense drones | Y CombinatorW22 | Active | checked 2026-08-23 |
| Wyvern High-res hyperspectral pictures of Earth from space | Defense and spaceHigh-resolution satellite imagery | Y CombinatorW22 | Active | checked 2026-08-23 |
| HEO Robotics We visually monitor space objects for governments and defense | Defense and spaceSatellite imagery and space monitoring | Y CombinatorS21 | Active | 2026-08-23 |
| Inversion Space Turning space into a transportation layer for Earth | Defense and spacespace infrastructure for transportation | Y CombinatorS21 | Active | checked 2026-08-23 |
| Kalam Labs Near Space Flying Machines | Defense and spacehigh-altitude UAVs for reconnaissance | Y CombinatorS21 | Active | checked 2026-08-23 |
| Odys Aviation Vertical takeoff and landing aircraft for major airlines | Defense and spaceeVTOL aircraft manufacturing | Y CombinatorS21 | Active | checked 2026-08-23 |
| Onebrief Onebrief makes military headquarters run seamlessly | Defense and spacemilitary planning software | Y CombinatorS21 | Active | checked 2026-08-23 |
| TransAstra Corporation Orbital logistics: Unleashing space industry, from Earth to asteroids | Defense and spaceorbital logistics and propulsion | Y CombinatorS21 | Active | checked 2026-08-23 |
| Turion Space Moving Things Around in Space, Imaging Space Objects When We're Not | Defense and spacespace domain awareness and orbital services | Y CombinatorS21 | Active | checked 2026-08-23 |
| Alba Orbital We make satellites to image everywhere on Earth, every 15 minutes | Defense and spaceEarth observation satellite constellation | Y CombinatorW21 | Active | checked 2026-08-23 |
| Albedo Full-stack VLEO satellite missions | Defense and spaceVLEO satellite infrastructure and operations | Y CombinatorW21 | Active | checked 2026-08-23 |
| Care Weather The highest-accuracy global weather data from low-cost flat satellites | Defense and spaceEarth observation satellites | Y CombinatorW21 | Active | checked 2026-08-23 |
| Stoke Space Seamless mobility to, through, and from space. It starts with 100%… | Defense and spacereusable rocket launch vehicle | Y CombinatorW21 | Active | checked 2026-08-23 |
| Farcast We build advanced satcom user terminals | Defense and spacesatellite communications terminals | Y CombinatorW20 | Active | checked 2026-08-23 |
| EPIC AEROSPACE Last-mile delivery for satellites. | Defense and spacesatellite launch and delivery | Y CombinatorS19 | Active | checked 2026-08-23 |
| Ravn Ravn is building a heads-up display for soldiers. | Defense and spacetactical heads-up display for soldiers | Y CombinatorW19 | Active | checked 2026-08-23 |
| VotingWorks Non-profit building open-source voting machines for US elections. | Defense and spaceElection infrastructure and voting security | Y CombinatorW19 | Active | checked 2026-08-23 |
| PaladinAI We deploy autonomous drones to 911 calls. Our software gives first… | Defense and spaceemergency response drones | Y CombinatorS18 | Active | checked 2026-08-23 |
| Tesseract Tesseract builds better thrusters for modern satellites | Defense and spacesatellite propulsion systems | Y CombinatorS17 | Active | checked 2026-08-23 |
| Wright Electric Boeing for electric planes | Defense and spaceelectric aircraft manufacturing | Y CombinatorW17 | Active | checked 2026-08-23 |
| ApolloShield ApolloShield is a system that detects unwanted drones and drives them… | Defense and spacedrone detection and interdiction | Y CombinatorS16 | Active | checked 2026-08-23 |
| Prime Lightworks Prime Lightworks Inc. manufactures electric propulsion systems for… | Defense and spaceelectric propulsion for satellites | Y CombinatorS16 | Site unreachable | checked 2026-08-17 |
| Astranis Advanced satellites for high orbits. | Defense and spaceadvanced satellite communications | Y CombinatorW16 | Active | checked 2026-08-23 |
| Boom Economically and environmentally sustainable supersonic travel | Defense and spacesupersonic aircraft manufacturing | Y CombinatorW16 | Active | checked 2026-08-23 |
| Relativity Space Building humanity’s multiplanetary future. | Defense and space3D printed rockets and reusable launch vehicles | Y CombinatorW16 | Active | checked 2026-08-23 |
| Per Vices Building Mission Critical Software Defined Radio products. | Defense and spacesoftware defined radio hardware | Y CombinatorW12 | Active | checked 2026-08-23 |