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Deep Tech Companies in Southampton: 135 Active Firms (2026)
Deep tech companies in Southampton commercialise science-led engineering, computing and hardware innovation across the Solent economy.
Buying centres tend to sit in technical and operational teams rather than general software procurement: industrial engineering, healthcare R&D, infrastructure operators, public-sector technology units, and corporate cyber or computing functions. Customers are mainly business-to-business or public-sector buyers, with sales cycles shaped by validation, integration and procurement risk. Engagements often begin as funded pilots, proofs of concept, specialist component supply or licensing discussions, then move towards production contracts where safety, assurance and interoperability matter. The commercial pattern is closer to research-to-product companies than horizontal SaaS: fewer impulse purchases, more domain experts, and a higher burden of evidence before rollout.
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Southampton accounts for 135 actively trading deep tech companies, giving the city a compact cohort across the Solent economy rather than a broad national-scale cluster. Reported headcount totals 692 people, which points to a local employment footprint spread across specialist employers rather than a small set of very large workplaces. Commercial maturity is uneven: 6 companies report turnover above £5M, while 17 were incorporated since 2022. That mix is consistent with a city market where research-led formation and applied industrial demand sit close together, but only a minority have reached larger revenue bands.
Deep tech in Southampton sits inside a mixed regulatory map rather than a unified licensing regime. AI and computing work is handled through sector-specific oversight; healthcare, cyber, advanced connectivity and engineering biology each face their own assurance, safety and procurement tests. Engineering biology has dedicated regulator coordination, sandboxes and the Genetic Technology (Precision Breeding) Act, while cyber activity is being shaped by secure-by-design policy and the Cyber Security and Resilience Bill. For quantum technologies and semiconductors, market structure is more influenced by national strategy, public funding and standards than by routine firm-by-firm authorisation.
The Southampton cohort appears likely to remain research-proximate, with commercial traction depending on procurement cycles in industrial, healthcare, public-sector and infrastructure buyers. Early-commercial firms tend to face longer validation periods than software-only businesses, so the route from pilot to repeat revenue may be uneven. Scarcity of larger revenue reporters points to a scale-up gap, while the presence of newer incorporations suggests continuing formation at the lab-to-market edge. Acquisition by strategic buyers and partnership-led routes to market may matter more than volume hiring, especially where certification, safety cases or hardware supply chains are part of the sale.
135
Active firms
2026
6
Above £5M
turnover
17
Since 2022
new incorporations
Key facts
About 4% of the trading cohort reports turnover above £5M (6 of 135 firms) — the rest sits below that revenue band.
12% of the cohort was incorporated since 2022 (17 firms), so a sizeable share is in its first few filing cycles.
UK deep tech is not a single regulated industry; oversight is mostly technology- and use-case-specific.
Government policy identifies six priority frontier technologies: advanced connectivity, AI, cyber security, engineering biology, quantum technologies and semiconductors.
AI is being handled through a sector-specific model, while cyber activity is linked to the Cyber Security and Resilience Bill and secure-by-design policy.
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 falls from 57% at seed stage to under 10% at late stage, leaving later rounds more dependent on overseas capital.
Top Southampton Deep Tech companies
Nortek Instruments Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and manufactures acoustic Doppler instruments for oceanographic measurement and subsea navigation, including ADCPs and DVLs. Supplies sensors, buoy systems and software used to measure ocean…
Sells to B2B and public-sector buyers in marine science, oceanography, subsea robotics, defence, renewable energy, offshore operations, coastal engineering and marine resources, including…
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 4y
Location
Altertek Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures custom lithium‑ion batteries, battery management systems, and battery packs. Provides electronics and product development, BMS configuration software, and energy storage…
Serves B2B engineering teams and OEMs in vehicle, grid storage, robotics, drone, marine/submarine and renewable energy sectors that need lithium battery systems and battery management support.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Clearwater Sensors
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops and supplies submersible chemical sensors and analysers for in situ water chemistry monitoring. Products measure parameters including nitrate, phosphate, silicate, iron and pH using…
Serves scientific researchers, environmental monitoring organisations, and industrial operators needing in-situ water chemistry data across rivers, lakes, coastal waters and deep-sea environments.
Financial Health
StrongStrong · Hiring · 57% CAGR over 4y
Location
TOUCHNETIX LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops capacitive touch and force sensing integrated circuits and sensor technology for user interfaces. Produces aXiom touch controller chips and sensors used in automotive controls, industrial…
Sells to B2B OEMs and product manufacturers in automotive, industrial controls, consumer electronics, medical devices, kiosks, marine, appliances, heavy machinery, transportation, entertainment, and…
Financial Health
HealthyHealthy · Hiring · 22% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and maintains open‑source compiler toolchains and AI software infrastructure for processor and chip developers. Provides GCC and LLVM‑based C/C++ and Rust toolchain development,…
Sells to semiconductor and hardware businesses developing embedded, RISC-V, Arm, HPC and AI-enabled processors, and to engineering companies with software teams needing specialist compiler and AI…
Financial Health
HealthyHealthy · -11% CAGR over 4y
Location
Solead Energy Ltd
Trajectory
2y · 2025–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
PLASMA SPACE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
ADA MODE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops AI and data platforms for industrial operations, including machine health monitoring, predictive maintenance and energy optimisation. Provides data engineering, simulation, and custom AI…
Serves industrial operators, OEMs, government bodies and regulators in energy, manufacturing, marine, networks, civil nuclear and wind, typically organisations running complex plants or…
Financial Health
StrongStrong · Hiring · 16% CAGR over 4y
Location
OCEAN INFINITY GROUP (UK) LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides offshore hydrographic surveying, subsea search and inspection, and maritime data acquisition using remotely operated and autonomous vessels, robotics, and software systems. Delivers seabed…
Serves B2B and public-sector organisations with offshore and maritime operations, including energy companies, government agencies, and organisations involved in subsea search, survey, data and remote…
Financial Health
StrongStrong · Hiring · 4% CAGR over 4y
Location
WINDSHIP TECHNOLOGY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops wind‑assisted propulsion technology for commercial ships, including patented triple wing‑foil rigs that generate thrust. Provides integrated vessel systems combining wind power with solar…
Serves commercial shipping companies, shipowners and vessel operators running large vessels over 30,000 tonnes, especially organisations focused on emissions reduction and IMO compliance.
Financial Health
DistressedDistressed
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops hardware and software for KNX IoT smart building connectivity, including Thread-based wireless chips, modules, hubs, mesh extenders, environmental sensors and development kits. Also provides…
Serves B2B customers in smart building and building automation, including KNX users, device developers/manufacturers, and organisations adopting Thread and KNX IoT connectivity.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Develops and supplies motion detection systems that detect hidden human presence inside vehicles using vibration and signal‑processing sensors. Provides hardware, software, and mobile tablet systems…
Serves border and coast guard agencies, ports and terminal operators, prison services, and military, industrial, research or government sites running vehicle checkpoints.
Location
ELECTRON DYNAMICS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -16% CAGR over 4y
Location
ROGERS SCIENTIFIC LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed
Location
Delta Kinetic Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures motion simulation systems and virtual reality training simulators for land, marine and air vehicles. Provides engineering design, electronics, mechanical and systems…
Serves public-sector and commercial organisations needing vehicle training technology, including fire and rescue services, industrial vehicle operators, marine training providers and companies…
Financial Health
WeakWeak · Hiring · 6% CAGR over 4y
Location
ARA Health Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsConducts research and engineering for health and human safety, including bioaerosol and applied microbiology studies, physiological modelling and testing, and development of medical and…
Serves government and defence agencies, public-sector bodies, and organisations in infrastructure, health research, energy and environmental sectors.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Sensiphi Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Mantle Labs Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides data analysis for forestry and agriculture projects using remote sensing, environmental science and machine learning, supporting carbon market initiatives and climate change mitigation and…
Serves B2B carbon market clients, forestry and agriculture project developers, and organisations involved in climate change mitigation and resilience projects.
Financial Health
StableStable · Hiring · 46% CAGR over 4y
Location
LUKJU LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Ascend Technologies Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -10% CAGR over 4y
Location
BBOX LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
Lurion Ltd
Trajectory
3y · 2021–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Pulse Photonics Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Physics, Aviation and Data Science Research Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
ADVENTUROUS MACHINES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 15% CAGR over 5y
Location
UK SEABED RESOURCES LIMITED
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable · -81% CAGR over 3y
Location
WRC DEVELOPMENTS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · -86% CAGR over 2y
Location
AQUARK TECHNOLOGIES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops and manufactures miniaturised cold‑atom quantum hardware used for precision sensing, timing and spectroscopy. Designs compact systems integrating vacuum, photonics and microfabrication…
Serves B2B and public-sector organisations operating critical infrastructure, including telecoms networks, data centres, energy grids, navigation/security systems, financial services, healthcare…
Financial Health
StrongStrong · Growing, Hiring · 80% CAGR over 2y
Location
Roke
Develops defence and security technologies including AI analytics, cyber security systems, autonomous and robotic platforms, electromagnetic spectrum and signals intelligence tools, and specialised…
Sells primarily to defence, national security and government buyers, plus organisations in regulated and critical sectors needing cyber, AI, intelligence, communications, autonomy and sensing…
Location
Woodrow Scientific Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops high‑power laser systems and platforms, including eye‑safe laser cleaning equipment, robotic laser‑cleaning systems, and erbium‑doped fibre laser and amplifier technology used for free‑space…
Serves industrial manufacturers and facilities teams, hospitals and public-space operators, plus aerospace and satellite communications organisations; also references domestic markets.
Financial Health
HealthyHealthy · Hiring · 63% CAGR over 4y
Location
Covesion Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures magnesium‑oxide doped periodically poled lithium niobate (MgO:PPLN) crystals, waveguides and fibre‑coupled modules for laser wavelength and frequency conversion. Also…
Serves research institutions and commercial photonics teams in quantum technology, lasers, scientific instrumentation, environmental, medical, life science, aerospace and defence markets.
Financial Health
StrongStrong · Growing, Hiring · 21% CAGR over 2y
Location
IONOPTIKA LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures ion beam instruments and components, including ToF‑SIMS systems, ion sources, and single‑ion implanters. Supplies ultra‑high‑vacuum accessories and custom ion beam systems…
Serves researchers and laboratory teams in universities, research institutes and industrial R&D across materials science, life sciences, surface science, quantum science, nanotechnology and…
Financial Health
HealthyHealthy · Hiring · 4% CAGR over 5y
Location
NKT Photonics
Develops and manufactures fiber lasers, supercontinuum white‑light lasers, ultrafast lasers, and photonic crystal optical fibers. Supplies laser modules and optical components used in scientific…
Serves R&D teams, OEMs, and research institutions in photonics-dependent sectors, including bio-imaging, semiconductor, device characterization, scientific instrumentation, quantum and…
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops nanoclay‑based biomaterial platforms for regenerative medicine. Its RENOVITE injectable gel scaffold delivers cells and biologic therapeutics to damaged tissue, supporting tissue…
Targets health systems, orthopaedic and regenerative medicine clinicians, and medtech/pharma partners focused on patients needing tissue regeneration after ageing-related disease, trauma or injury.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
Power Management Engineering Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDevelops and supplies high‑voltage power electronics and equipment for electricity transmission and industrial power systems, including STATCOM reactive compensation systems, voltage source…
Serves B2B infrastructure and industrial customers, including electric utilities, renewable energy developers, oil and gas operators, rail networks, metallurgy plants and mining companies with…
Financial Health
StableStable · 0% CAGR over 2y
Location
Advanced Embedded Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides rugged embedded computing hardware including VPX chassis, mission computers, FPGA signal processing modules, data recorders, networking interfaces, storage modules, and avionics bus…
Sells to B2B and defence-sector buyers needing rugged embedded computing, including aerospace, avionics, military and high-performance signal processing teams. Targets engineers, system integrators…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Bowman Power
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures electrified turbomachinery systems for engines and fuel cells, including eTurbochargers, eCompressors and heat‑recovery turbines. Provides TorqIQ‑based technology and…
Serves B2B customers developing or operating large industrial engines, fuel cells and power generation systems, including OEMs and energy operators seeking emissions reduction and…
Financial Health
StrongStrong · Hiring · 26% CAGR over 2y
Location
Trajectory
4y · 2020–NowFinancial sub-scores
Computed from 4 filingsDevelops and manufactures unmanned aerial systems (UAS) and autonomous platforms for defence, maritime and surveillance missions. Provides drone-based intelligence, monitoring and data services,…
Sells to defence and civil/public-sector buyers needing unmanned aerial systems and intelligence services, including armed forces, maritime safety agencies, electronic warfare users, and…
Financial Health
StrongStrong · Growing, Hiring · 23% CAGR over 4y
Location
SouthWestSensor Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops microfluidic sensing devices for water quality monitoring. Products include in‑situ probes and online analysers that use nanodroplet microfluidics and onboard reagents to measure nutrients…
Serves water utilities, industrial operators, environmental monitoring teams and water treatment plants needing surface water, effluent and process monitoring data integrated into dashboards or SCADA.
Financial Health
StableStable · Hiring · 7% CAGR over 3y
Location
MULTIPLE ACCESS COMMUNICATIONS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops software-defined radio and advanced signal processing technologies for wireless communications, electronic sensing and spectrum monitoring. Provides research, design and engineering services…
Serves security, defence and space organisations, including product development teams needing wireless communications, electronic sensing and spectrum survey expertise, from requirements through…
Financial Health
StableStable · -78% CAGR over 3y
Location
Focus Sensors Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops fibre‑optic sensing systems, including distributed acoustic sensing and fibre optic movement sensing technology, that use existing optical cables to monitor infrastructure. Applications…
Serves B2B infrastructure owners, system integrators, rail network operators, rolling stock operators and water utilities seeking monitoring and protection of rail, water and other linear assets.
Financial Health
StableStable · -3% CAGR over 4y
Location
Ohmspace Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops electric propulsion systems for spacecraft, including advanced resistojet technology designed to reduce propellant consumption and extend satellite mission lifetimes. Provides propulsion…
Serves B2B aerospace customers, including satellite manufacturers and operators, propulsion engineering teams, and space agencies developing electric satellite platforms and space missions, with…
Financial Health
StrongStrong · 76% CAGR over 3y
Location
Symetrica
Trajectory
4y · 2020–NowDesigns and manufactures radiation detection and identification systems for security applications, including handheld detectors, backpack and vehicle‑mounted units, and fixed portal monitors. Also…
Serves government, defence, law enforcement and security agencies responsible for homeland security at borders, ports, airports and cities, plus operators in sectors such as scrap metal, event…
Financial Health
Insufficient historyInsufficient history
Location
White & Son Technologies Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
Smart Fabric Inks Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and produces smart fabric technologies and conductive inks for textiles, including printed fabric heaters, electrode arrays, textile circuits, and light‑emitting textiles, and provides…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
Xgenera Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops molecular diagnostic technologies for early cancer detection. Its miONCO test is designed to analyse blood samples to detect up to 12 cancer types simultaneously, supporting earlier…
Targets individuals and patients seeking earlier cancer awareness and health insight, with relevance to healthcare research partners and clinical organisations involved in cancer detection studies.
Financial Health
StrongStrong
Location
Millfield Medical Electronics Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
Connexion Technologies
Provides engineering design and advanced manufacturing services, including electronics, RF and microwave systems, and power electronics. Develops and produces high‑reliability components and…
Serves B2B customers in energy and utilities, communications, defence, transportation, medical, test and instrumentation, aerospace and space, including global OEMs, Tier 1 suppliers, defence…
Location
BARTER FOR THINGS LTD.
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops Internet of Things (IoT) sensor platforms and analytics for utilities, maritime and horticulture. Products include meter connectivity systems, air quality monitors and greenhouse sensors,…
Serves B2B customers in water utilities, maritime and horticulture, including water companies with metering assets, port operators, and farmers or greenhouse operators using sensor-led operational…
Financial Health
HealthyHealthy · -7% CAGR over 2y
Location
WREN LABORATORIES LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDevelops and performs mRNA‑based liquid biopsy diagnostic tests for cancer detection and monitoring. Provides multi‑gene expression assays including NETest and PROSTest for neuroendocrine and…
Serves cancer care providers, oncologists and patients, plus biopharma and research teams involved in precision oncology, drug development and companion diagnostics.
Financial Health
StableStable · -51% CAGR over 6y
Location
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How Southampton Deep Tech companies work and how to sell to them
What they do
Deep tech firms usually monetise proprietary science or engineering work through a mix of paid pilots, R&D contracts, IP licensing, specialist component supply, integration services and eventual production agreements. Revenue often arrives in stages: feasibility work first, then validation, field deployment and support. Pricing is therefore less like per-seat SaaS and more like milestone fees, annual licences, usage or throughput charges, custom engineering retainers and unit economics for hardware. Southampton firms selling into healthcare, industrial or infrastructure settings will often need to package evidence, technical support and assurance documentation alongside the core product, because buyers are paying for lower technical risk as much as for the device, model or platform itself.
Who they sell to
Most buyers are technical or operational: CTOs, engineering directors, heads of R&D, clinical innovation teams, cyber leads, infrastructure operators, principal investigators and programme owners inside public bodies. Finance and procurement usually enter once a pilot has to become a repeatable contract, at which point evidence, liability, support model and integration cost matter. Sales cycles tend to run through direct founder-led or technical sales at first, then through procurement frameworks, RFPs, channel partners or systems integrators as the firm matures. Contract value is commonly gated: a smaller discovery or trial budget precedes larger production, licensing or maintenance commitments.
What they buy
Deep tech companies tend to buy tools and services that help them turn research into saleable, supportable products. Common spend areas include cloud compute, data infrastructure, simulation and design software, device testing, cyber security, quality management, documentation, finance systems, CRM, grant and bid support, IP legal advice, regulatory consulting and specialist recruitment. Hardware-heavy firms also need prototyping, electronics, materials testing, lab operations, supply-chain management and facilities support; AI and cyber firms will lean more towards data governance, model monitoring, secure development and customer assurance. Generic productivity claims usually land poorly unless they connect to validation, traceability or customer delivery.
Why and how to sell to them
Buying triggers are often tied to a change in technical or commercial risk. A prototype moving into field trial, a new public-sector or industrial customer, a certification project, an equity or grant-funded work package, senior technical hiring, or the first repeatable deployment can all create vendor appetite. Outbound works better when it recognises that these firms are short of time, not curiosity: researchers, engineers and founders will filter quickly for domain fit. Useful angles are evidence-led and specific to the workflow: reduce rework in validation, make audit trails easier to defend, improve handover from lab to customer site, or help procurement teams trust the supplier.
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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How is this list built and how fresh is the data?
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