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Perseus Defense

YC S25

Austin, US · Founded 2025 · 3 employees · Hiring · 8 known investors

Perseus Defense builds autonomous defense systems. The company focuses on next-generation autonomous technologies for defense applications.

Also known as Perseus Defense

Founders & leadership· Y Combinator alumni (S25)

Perseus Defense was founded in 2025 by Jason Cornelius and Steve Messinger.

JCJason Cornelius
Jason CorneliusinCo-Founder & CEOJason Cornelius co-founded Perseus Defense. He worked on the NASA Titan Dragonfly rotorcraft program and led an advanced concepts team on Mars helicopter design using AI and supercomputing. He teaches aerospace engineering at Stanford.
SMSteve Messinger
Steve MessingerinCo-FounderSteve Messinger is co-founder and CTO of Perseus Defense, with research and applied work in swarm robotics and autonomous systems. He has previously developed autonomy systems for Boeing aircraft and collaborative control systems for unmanned maritime platforms.

Investors · 8

Also in the syndicate · 2

Multimodal VenturesSparkwave Capital

Funding

SEC filings, press & company announcements

Source: company announcements and press reports — follow each round's link for the claim.

Company profile

researched Aug 2026

Perseus Defense develops counter-unmanned aerial system (C-UAS) hardware intended for U.S. Department of War and Homeland Security customers. Its stated mission is to enable mass production of micro-guided missiles that are affordable, scalable and portable, addressing the cost imbalance of intercepting inexpensive drones. The company positions its systems against Group 1 and Group 2 drone classes, which it describes as the categories most commonly used in one-way attack roles.

The product line comprises two disclosed elements. The Harpe interceptor is a kinetic missile roughly 24 inches long with a stated range of about 2 km and a target cost of under $10,000 per shot; the company states it has been flown in testing. The Perseus launcher is a portable, lightweight system weighing under 80 lb, with a stated setup time of under 60 seconds and 24-hour operation. Integrated tracking and engagement are combined in a single system, and launchers can be fielded singly or in a distributed architecture: units are deployed and powered, mesh with nearby launchers, receive targeting data from command-and-control or sensor systems, synchronize to build an engagement envelope, and then fire one or more missiles at the target. Systems are described as deployable in the field or mounted on vehicles.

Business model

Perseus Defense designs and intends to mass-produce counter-UAS interceptors and launcher hardware for government defense and homeland security buyers, with a stated per-shot cost target below $10,000.

Traction

The company states its Harpe interceptor has been proven in flight and publishes test footage. Its newsroom references exercise Golden Shield, a 1st Cavalry Division-led event at which counter-UAS capability providers tested new technologies.

Full profile — market position, technology, go-to-market, geography

Market position

Perseus Defense addresses the counter-drone segment, framing its offering against the practice of intercepting low-cost drones with far more expensive missiles.

The company frames its approach around cost and portability: micro-guided missiles priced under $10,000 per shot, optimized specifically for Group 1 and Group 2 drones, in a lightweight launcher that can be deployed by a single unit or distributed across a battlespace.

Technology

A portable kinetic missile interceptor system combining tracking and engagement in one unit. The Harpe interceptor is a micro-guided missile of approximately 24 inches with roughly 2 km range. The modular Perseus launcher meshes with nearby launchers, ingests targeting data from C2 or sensor feeds, synchronizes engagement envelopes across networked units, and supports autonomous operation, with system weight under 80 lb and setup in under 60 seconds.

Go-to-market

The company states it builds counter-UAS systems for the U.S. Department of War and Homeland Security.

Geography

Operations are based in Buda, Texas, United States, with the company describing itself as built in Texas.

Compiled by commissioned research from 1 cited public sources — announcements, filings, and press listed under research sources below.

Key figures

latest reported
Harpe interceptor cost per shotJan 2026$10K
Harpe interceptor lengthJan 202624 in
Harpe interceptor rangeJan 20262 km
HeadcountAug 20269
Perseus launcher operation durationJan 202624 hours
Perseus launcher setup timeJan 202660 seconds
Perseus launcher system weightJan 202680 lb

Company-reported or press-reported figures, each dated to when it was claimed — not independently audited.

Competitors · 3

by search overlap

Companies competing with Perseus Defense for the same Google search keywords, organic and paid, via search-intersection analysis.

In the news

Research sources · 1

primary sources listed

1 public sources were cited for this profile; the first-party ones are listed here.

Frequently asked questions

What does Perseus Defense do?
Texas-based developer of low-cost counter-UAS missile interceptors and portable launchers for U.S. defense customers.
Who founded Perseus Defense?
Perseus Defense was founded by Jason Cornelius, Steve Messinger in 2025.
Who are Perseus Defense's investors?
Perseus Defense's investors include Bow Capital, Lobster Capital, Olive Tree Capital, Y Combinator, Alumni Ventures, Rebel Fund.
Where is Perseus Defense headquartered?
Perseus Defense is headquartered in Austin, US.