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Deep Tech Companies in Plymouth: 31 Active Firms (2026)
Deep tech companies develop science- and engineering-led technologies across AI, hardware, robotics, healthcare and energy in the Plymouth area.
Buying centres in Plymouth tend to sit with technical, clinical, operational and infrastructure teams rather than broad corporate software buyers. The customer base is mainly B2B and public-sector-facing, with industrial, healthcare and infrastructure use cases shaping procurement. Engagements are likely to be proof-of-concept work, specialist integration, validation studies or grant-backed development partnerships rather than self-serve subscriptions. The common thread is defensible technical complexity: AI, cyber security, advanced connectivity, engineering biology, quantum technologies, semiconductors, robotics, hardware, materials, health technology and energy all appear as adjacent routes to market, but each brings a different buyer and evidence burden.
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Plymouth is a small local market, with 31 deep tech firms in this list actively trading. Reported employment is also limited, at 58 people across businesses that publish headcount. None report turnover above £5M, which keeps the cohort weighted towards research-led commercialisation, contract development and early customer validation rather than revenue-ranked scale-ups. The presence of 7 incorporated since 2022 points to continued formation, but the current footprint remains narrow by national deep-tech standards.
No single licensing regime covers Plymouth's deep-tech activity. Oversight follows the technology and the use case: AI is handled through a sector-specific model, engineering biology through the Engineering Biology Regulators Network, regulatory sandboxes and the Genetic Technology (Precision Breeding) Act, and cyber activity through secure-by-design policy and the Cyber Security and Resilience Bill. Quantum technologies and semiconductors are shaped more by national strategies, public funding conditions and standards work than by a single permissioning route. For Plymouth suppliers, the practical issue is often customer assurance: evidence, security, safety and procurement scrutiny arrive before formal sector regulation in many deals.
Commercial development appears likely to remain uneven. The local cohort has early-commercial weight and few visible revenue-scaled anchors, so specialist contracts, public-sector procurement and industrial pilots may matter more than volume sales motions. Buyers in healthcare, infrastructure, cyber and energy tend to ask for proof, governance and integration capacity before expanding deployments, which can lengthen sales cycles but also rewards defensible engineering. Consolidation may come through partnerships with larger industrial or public-sector suppliers rather than a wave of standalone scale-ups, particularly where regulation, capital intensity and technical validation all sit in the same procurement conversation.
31
Active firms
2026
7
Incorporated since 2022
Plymouth-area firms
0
Above £5M
reported turnover
Key facts
22% of the cohort was incorporated since 2022 (7 firms), so a sizeable share is in its first few filing cycles.
Deep tech is not a single regulated industry in the UK; oversight tends to follow the technology and use case rather than the sector label.
UK government policy identifies six priority frontier technologies: advanced connectivity, AI, cyber security, engineering biology, quantum technologies and semiconductors.
AI follows a sector-specific model, engineering biology is supported by the Engineering Biology Regulators Network, regulatory sandboxes and the Genetic Technology (Precision Breeding) Act, and cyber activity links to the Cyber Security and Resilience Bill.
UK deep tech venture investment has slowed from its 2021 peak but still consistently attracts over £5 billion in annual venture capital.
Domestic investor participation in UK deep tech falls from 57% at seed stage to under 10% at late stage, leaving later rounds more reliant on overseas capital.
Top Plymouth Deep Tech companies
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops and deploys autonomous micro ocean robots (C-Stars) that operate in distributed constellations to collect persistent ocean data. Systems provide wide‑area maritime sensing and monitoring for…
Serves government agencies, research institutions and infrastructure stakeholders needing persistent ocean intelligence for climate monitoring, maritime security, offshore energy, seabed pipelines…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
Location
Silicon Sensing
Designs and manufactures MEMS-based inertial sensors including gyroscopes, accelerometers and inertial measurement units. Products are used in navigation, stabilisation, pointing and motion sensing…
Serves B2B OEMs and engineering teams in aerospace, defence, robotics, autonomous vehicles, marine/subsea, space, precision agriculture and industrial motion-sensing applications.
Location
M Subs
Designs, manufactures and operates manned and unmanned submersibles and underwater vehicles for military, research and commercial use. Provides engineering services including pressure vessel design,…
Serves defence and naval organisations, commercial marine/offshore operators, and scientific research bodies requiring manned or unmanned submersible systems, autonomous vessels, and operational…
Location
12 ST JOHNS ROAD MANAGEMENT COMPANY LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and operates manned and unmanned submersible vehicles, including diver lock‑out and combat submersibles and unmanned underwater and surface vehicles, and provides engineering,…
Serves defence organisations, commercial marine operators and scientific research bodies, including teams procuring or operating manned and unmanned underwater and surface vehicles.
Financial Health
StableStable
Location
MSubs
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and operates manned and unmanned submersibles, underwater vehicles and autonomous surface vessels for military, scientific and commercial use. Provides engineering design,…
Serves defence organisations, naval operators, scientific research bodies and commercial marine/offshore customers requiring manned or unmanned submersible systems and related operational support.
Financial Health
StrongStrong · 0% CAGR over 1y
Location
Equisonics Ltd.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
GEARED LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
GSG WORKS LTD
Trajectory
4y · 2020–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
WeakWeak · Hiring · 23% CAGR over 3y
Location
ARUNDAL ASTRONAUTICS LTD
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
MODUS LABORATORIES LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable · 0% CAGR over 1y
Location
FINGOTI LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -7% CAGR over 4y
Location
MIRRECO UK LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Dark Ocean Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and engineers deep‑sea submersibles and underwater vehicles, including electrical systems, control and navigation software. Provides vehicle design, engineering consultancy, certification…
Serves specialist B2B clients in deep-sea marine sectors: submersible manufacturers and operators, ocean exploration expeditions, documentary and research organisations, defence-related underwater…
Financial Health
HealthyHealthy · Hiring · 14% CAGR over 4y
Location
Fishtek Marine Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, tests and manufactures technology for fisheries and marine operations, including bycatch reduction devices, deterrents and low‑impact fishing equipment. Provides engineering, research and…
Serves commercial fishing fleets, marine operators and offshore infrastructure developers globally, from small coastal fleets to large offshore operations, plus organisations involved in fisheries…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
Brent Measurement Technology Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
DART SENSORS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures fuel cell sensors for alcohol and formaldehyde detection. Produces breath alcohol, transdermal alcohol and ignition interlock sensors, along with calibration standards,…
Serves B2B OEMs and equipment manufacturers building alcohol and formaldehyde detection products, including breathalyser, ignition interlock, police-approved testing, environmental monitoring and…
Financial Health
StableStable · -68% CAGR over 4y
Location
CORESYS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Kealow Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Scope Works Consulting Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
Valogen Biosciences Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · Hiring · 32% CAGR over 4y
Location
AAA SCIENTIFIC LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
BLUE PENINSULA MARINE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
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How Plymouth Deep Tech companies work and how to sell to them
What they do
Plymouth deep tech firms tend to earn revenue through staged technical engagements rather than simple subscription volume. Common models include grant-funded research, paid pilots, contract development, specialist integration, licensing of protected IP, and support or maintenance around deployed hardware or software. Some sell physical systems, devices or components; others package algorithms, scientific methods or engineering know-how into repeatable platforms. Commercial commitments usually begin with validation, feasibility work or a narrow operational use case, then move into longer service, licence or deployment agreements if the technical evidence holds. Margin can depend as much on engineering time and access to specialist facilities as on the underlying product.
Who they sell to
Most sell to technically literate buyers in industrial, healthcare, infrastructure, defence-adjacent and public-sector settings. Day-to-day sponsors are often CTOs, heads of R&D, clinical leads, operations directors, security teams or engineering managers, with finance and procurement joining once the work moves beyond a pilot. Sales cycles tend to be longer where safety, data protection, integration or operational downtime are material concerns. Procurement may come through direct founder-led selling, public tenders, university or grant consortia, systems integrators, or partner channels attached to larger programmes. Buyers usually expect a clear evidence pack before they treat a prototype as an operational purchase.
What they buy
Most deep tech firms tend to spend on tools and services that reduce technical, regulatory and commercial friction. Relevant categories include cloud infrastructure, data engineering, cyber security, observability, testing environments, quality management, CRM, project accounting, grant finance support and contract management. Hardware-led businesses may also need prototyping, electronics design, specialist manufacturing, lab access, calibration, insurance and health-and-safety advice. Health, biology and energy-related firms often buy regulatory, IP and standards support early, because customer diligence can arrive before recurring revenue. Recruitment is also a recurring need, particularly for engineers, applied scientists, product managers and commercial leads who can translate technical proof into buyer language.
Why and how to sell to them
Deep tech buyers tend to evaluate vendors when a pilot becomes repeatable, a grant or customer contract creates delivery pressure, a technical founder hires a commercial lead, or a regulated customer asks for security, safety or quality evidence. Useful outbound angles are usually practical: shorten validation work, reduce integration risk, document compliance, improve project visibility, or help small teams sell into formal procurement. Generic productivity claims tend to land badly unless tied to a specific bottleneck. Plymouth firms in this segment may be receptive to suppliers that understand staged development, public-sector paperwork and the gap between scientific promise and deployable operations.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
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