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Startup · United Kingdom

CSignum

HQ Bathgate, United KingdomFounded 202011-50 employeesUpdated

Revolutionising underwater communications with electromagnetic technology for seamless data integration between surface & submerged devices.

StartupCommand, control and communicationsUncrewed systems
Website
Total raised
~$12.6M
3 rounds
Last round
~$3.5M
Stage undisclosed · Sep 23, 2026
Systems
4
Capabilities
2

Funding3 rounds · ~$12.6M

Equity raised
~$12.6M
Latest
~$3.5MStage undisclosed · Sep 23, 2026
Cumulative raised$12.6M
Mar 6, 2024Sep 23, 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.

Systems4

  • EM-2A wireless communications system for sensor data through water and ground.
    —
  • EM-2GBankside wireless gateway used with CSignum’s underwater monitoring equipment.
    —
  • EM-2QA wireless communications system for water-quality monitoring.
    —
  • EM-2SA wireless communications system for ship-hull monitoring sensors.
    —

Newest unveiled first. Systems that belong to a government program link to the program page, where variants, costs and contracts are.

Capabilities2

  • Command, control and communications
    Developer
    classify_sectors run 52, haiku, taxonomy 2026-10-18b: Electromagnetic underwater communications whose stated uses include critical infrastructure security and defense.
    —Reported
  • Uncrewed systems
    Developer
    classify_sectors run 52, haiku, taxonomy 2026-10-18b: Electromagnetic underwater communications whose stated uses include critical infrastructure security and defense.
    —Reported

Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.

People3

All 3 people →
People
PersonRole
Chris Brooks · LinkedIn ↗Chief Executive Officer
Graeme BoyceCOO
Jonathan ReevesCEO

More in Command, Control and Communications

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Sources12

Show all 12 sources and supporting evidence

Profile3

  1. 1
    DatabaseCSignum - PitchBook company profile

    PitchBook · Supports Organization · employee range, Organization · founded year, Organization · linkedin url, Organization · x url

    “employee_range: 11-50 (profile: 29)”
  2. 2
    DatabaseSixth-Domain public startups directory

    Sixth-Domain · Supports Organization · country, Organization · kind

    “{"country": "UK", "hq_iso2": "GB", "id": "d1a1d40e-f17f-46ba-9701-98d05dd480f0"}”
  3. 3
    DatabaseCSignum - LinkedIn company profile

    LinkedIn · Supports Organization · employee range, Organization · founded year, Organization · hq city, Organization · hq region, Organization · linkedin url

    “employee_range: 11-50 (profile: 11-50 employees)”

Systems2

  1. 4
    CompanyCSignum - Wireless Through Water, Ice and GroundExpandExpandExpandToggle MenuTagsTagsTagsTagsLinkedinScroll to topScroll to topExpandExpandExpand

    CSignum · Supports Organization · description, Organization · name, Organization · website, System

    “Revolutionising underwater communications with electromagnetic technology for seamless data integration between surface & submerged devices.”
  2. 5
    CompanyCSignum’s teams will be available to share their learnings from recent deployments of their wireless continuous water quality monitoring system at the SWIG events during March - CSignum

    CSignum · Supports System

    “The combination of the underwater EM-2Q and the bankside EM-2G gateway provides a powerful and reliable system that is suitable for use in any river, lake or underwater environment.”

Funding5

  1. 6
    CompanyCSignum secures £6M to transform underwater wireless networks

    CSignum · Apr 22, 2025 · Supports Funding round, Funding round · amount, Organization · ownership, Role

    “The funding round was led by Archangels, Par Equity, and Scottish Enterprise”
  2. 7
    NewsCSignum Raises £6M in Series A Funding

    FinSMEs · Apr 22, 2025 · Supports Funding round · amount

    “raised £6M in Series A funding”
  3. 8
    CompanyCSignum Secures £1 Million of Funding to Transform Underwater and Underground Sensor Networking

    CSignum · Mar 6, 2024 · Supports Funding round · amount

    “has announced £1 million of additional funding from a consortium of US investors”
  4. 9
    NewsCSignum raises £2.6M to send data through water, ice and ground

    Dealroom News · Supports Funding round · amount

    “has raised £2.6 million in early-stage funding”
  5. 10
    NewsScottish scale-up confirms new CEO to lead next phase of commercial growth

    Envirotech Online · Supports Funding round

    “has completed a £2.6 million funding round”

People2

  1. 11
    DatabaseCSignum - Crunchbase company profile

    Crunchbase · Supports Organization · employee range, Organization · hq city, Organization · linkedin url, Organization · x url, Role

    “employee_range: 11-50 (profile: 11-50)”
  2. 12
    CompanyManagement Team - CSignum

    CSignum · Supports Role

    “Graeme Boyce is the COO at CSignum and brings over 20 years of leadership experience driving operational transformation and scalable growth across manufacturing, engineering, cleantech, and high-growth technology sectors.”

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