Skip to content
DefDex
Surtr Defense Systems logo

Startup · United States

Surtr Defense Systems

HQ San Francisco, CAFounded 20261-10 employees

Software combining counter-drone sensor data and operator decision support.

StartupPrototype
Website
Total raised
$4.8M
1 round
Last round
$4.8M
Pre-Seed · Jul 7, 2026
Systems
1
Most mature: prototype
Mentions
1
Latest Jul 7, 2026

News1

Open in the news feed →

Funding1 round · $4.8M

Equity raised
$4.8M
Latest
$4.8MPre-Seed · Jul 7, 2026

Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.

Systems1

ParallaxOS

Hardware-agnostic operating system that fuses counter-drone sensors and effectors into one picture.

Prototype

Newest unveiled first. Open a system for its milestone timeline, components and sources.

Supply Chain1 facility

Facilities1

  • Surtr Defense Systems San Francisco headquarters
    Headquarters · San Francisco, CA, United States
    Operating
    Reported

People2

All 2 people →

Company Metrics

LinkedIn employee profiles
4
Observed Oct 13, 2026
Bright Data / LinkedIn · Source ↗
LinkedIn followers
1,108
Observed Oct 13, 2026
Bright Data / LinkedIn · Source ↗

Employee-profile counts reflect LinkedIn profiles associated with the company, not verified headcount. One observation establishes a baseline; it does not establish growth.

Sources5

Profile1

  1. 1
    CompanyDefense Startups funded by Y Combinator (YC) 2026 | Y Combinator

    Y Combinator · Supports Organization

    “Surtr Defense Systems”

Systems3

  1. 2
    NewsExclusive: Surtr Raises $5M Pre-Seed for C-UAS Integration

    Tectonic · Jul 7, 2026 · Supports Funding round, Funding round · amount, Funding round · investors, Organization, Organization · ownership, System · maturity

    “it’s raised a $4.8M pre-seed round”
  2. 3
    CompanySurtr Defense | The hardware-agnostic operating system for air defense

    Surtr Defense Systems · Supports Organization · linkedin url, System

    “https://www.linkedin.com/company/surtr-defense-systems”
  3. 4
    OtherSurtr Defense Systems: The hardware-agnostic operating system for drone defense | Y Combinator

    Y Combinator · Supports Facility, Organization, Organization · status, Organization · x url, Role, System

    “Location:San Francisco”

Other1

  1. 5
    DatabaseSurtr Defense Systems - LinkedIn company profile

    LinkedIn · Supports Organization · employee range, Organization metric · employees in linkedin, Organization metric · followers

    “employee_range: 1-10 (profile: 2-10 employees)”

Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.