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Wardstone

YC F25

El Segundo, US · Founded 2025 · 8 employees · Hiring · 13 known investors

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Wardstone designs and plans to deploy a constellation of satellites equipped with sensors and kinetic interceptors to detect, predict, and counter hypersonic and ballistic missiles for U.S. military defense agencies. The system, called the Golden Dome, is intended to provide global missile defense capabilities across multiple domains of conflict for the Space Force, Air Force, Navy, and Missile Defense Agency.

Advanced ManufacturingDefense TechSpace TechHard TechSatellitesRocketryAerospaceDefenseUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (F25)

Wardstone was founded in 2025 by Sebastian Fischer and Tobias Fischer.

SFSebastian Fischer
Sebastian FischerCo-founder · Chief Executive OfficerHe brings over a decade of engineering and product experience from roles at Amazon Prime Air, Cruise Self-Driving, Lockheed Martin, and NASA on planetary spacecraft, with an aerospace engineering degree from MIT and dual MS/MBA from Harvard.
TFTobias Fischer
Tobias FischerCo-founder · Chief Technical OfficerHe previously worked at Astranis on geostationary communication satellites and studied mechanical engineering at Cornell University, where he served as Chief Spacecraft Engineer on a lunar CubeSat mission.

Investors · 13

Pioneerlisted by PioneerToronto, Ontario

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SHORlisted by SHOR

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Y Combinatorlisted by Y CombinatorSan Francisco · $500K

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ALLEGIS CAPITALreportedPalo Alto · $10M

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B5 CapitalreportedSilicon Valley

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Bow CapitalreportedMenlo Park · $5M

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Ecosystem Ventures LLCreportedSilicon Valley

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Liquid VenturesreportedSan Francisco · $250K – $5M

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Mergus VenturesreportedSão Paulo · $100K – $1M

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Metsu Capitalreported

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Rice CapitalreportedCovina

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Twenty Two VenturesreportedPalo Alto · $50K – $250K

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Images

Wardstone photo

Related companies · 6

ElodinElodin provides a cloud-based simulation platform for building autonomous systems, targeting developers and engineers creating satellites, drones, and robots. The company aims to make advanced autonomy tooling accessible and affordable to innovators in aerospace and robotics.
TesseractTesseract designs and manufactures spacecraft propulsion hardware, including off-the-shelf thrusters, multi-thruster modules, and complete propulsion systems for space missions. The company prioritizes low-toxicity green propellants, cost-effective manufacturing, and flight-qualified reliability for aerospace applications.
Capella SpaceCapella Space designs, builds, and operates synthetic aperture radar (SAR) satellite constellations that provide all-weather, day-and-night Earth observation imagery at sub-0.25m resolution. It offers an automated end-to-end tasking and data delivery platform serving defense and intelligence, maritime, disaster response, and infrastructure monitoring customers.
Relativity SpaceRelativity Space develops Terran R, a reusable medium-to-heavy-lift rocket designed for efficiency and scalability, serving government entities, telecommunications companies, and commercial customers for space access missions. The company focuses on making space exploration more accessible, reliable, and sustainable.
BasaltBasalt operates managed satellite constellations controlled by artificial intelligence, serving private companies and government agencies that lack aerospace expertise and want to collect and stream satellite imagery and data to their devices.
Zephyr FusionZephyr Fusion develops compact, in-orbit fusion power systems for space-based applications including microgravity manufacturing, data centers, defense, propulsion, and human habitation. The company leverages fusion technology to provide megawatt-class power generation for space industry customers.

Companies working in the same space as Wardstone.

Legal entities · 1

corporate structure
Wardstone, Inc.

In the news

Wardstone: Satellites for Missile Defenseycombinator.com · Nov 2025Wardstone Funding | Complete Analysis | Extruct AIextruct.ai

Frequently asked questions

What does Wardstone do?
Wardstone designs and plans to deploy a constellation of satellites equipped with sensors and kinetic interceptors to detect, predict, and counter hypersonic and ballistic missiles for U.S. military defense agencies. The system, called the Golden Dome, is intended to provide global missile defense capabilities across multiple domains of conflict for the Space Force, Air Force, Navy, and Missile Defense Agency.
Who founded Wardstone?
Wardstone was founded by Sebastian Fischer, Tobias Fischer in 2025.
Who are Wardstone's investors?
Wardstone's investors include Mana Ventures, Pioneer, SHOR, Y Combinator, ALLEGIS CAPITAL, B5 Capital, Bow Capital, Ecosystem Ventures LLC and 5 more.
Where is Wardstone headquartered?
Wardstone is headquartered in El Segundo, US.