B2B Companies Using IONOS in the UK: 299 Active Firms (2026)
B2B companies running web-hosting infrastructure sell products and services to other organisations through hosted public websites in the UK.
Among business-to-business suppliers, this hosting stack usually sits in the marketing and sales operations layer rather than in core product delivery. It supports service pages, quote requests, project galleries, distributor catalogues and basic contact capture for firms that rely on direct enquiries and relationship-led sales. Adoption tends to signal a company with a named website owner, modest external-agency support and a preference for packaged hosting over internally managed infrastructure. The sector skew towards field services, construction, advanced manufacturing and wholesale distribution points to practical buying centres: owners, commercial managers and operations teams who need visible proof of capability before a sales conversation starts.
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299 companies running this hosting stack are actively trading in the UK. Reported employment totals 1,449 people, giving the cohort a modest labour footprint. Within the business-to-business hosting category, the stack sits ninth at 1.8% across a 16,982-company hosting category base. Regional adoption is fairly dispersed: Yorkshire and The Humber and London each account for 11.7%, followed by the South East at 11.0%, the East of England at 10.7%, and the East Midlands at 9.7%.
Running a hosted public site does not create a sector licence requirement on its own; the regulatory load follows the activity behind the enquiry form. Business-contact capture, analytics identifiers and sales outreach bring UK GDPR into scope where personal data is processed. PECR also matters for direct marketing by live or automated calls, electronic mail and fax. The ICO says the electronic-mail rule does not apply to “corporate subscribers”, so corporate email or text outreach does not require PECR consent, but senders must not hide their identity and must offer a valid opt-out. Live business marketing calls still need screening against CTPS and TPS, and businesses that have objected should not be called.
Adoption appears to be shaped less by deep platform migration and more by the economics of small sales-led websites. Users in field services, construction, manufacturing and distribution tend to need quotation capture, service proof and local search visibility before complex digital commerce. Migration pressure is likely to come from bundled site-builder offers, security defaults and agency consolidation rather than a board-level infrastructure strategy. Some firms may move as they professionalise demand generation; others will keep a familiar host until a redesign, compliance review or ownership change forces a wider stack decision.
Adoption by company size
Adoption of IONOS varies by company size across the trading UK B2B companies in this cohort. 0.3% of the 76,784 companies with under 10 employees run IONOS (223 detected). 0.2% of the 31,788 companies with 10–50 employees run IONOS (69 detected). 0.2% of the 3,773 companies with over 50 employees run IONOS (7 detected). That is a 0.1% gap between the over 50 employees and under 10 employees bands.
299
Active firms
2026
1.8%
Of detected Hosting share
UK B2B
6
Median headcount
Filed accounts
575
Verified contacts
Across this cohort
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Key facts
About 2% of the trading cohort reports turnover above £5M (7 of 299 firms) — the rest sits below that revenue band.
4% of the cohort was incorporated since 2022 (12 firms), so a sizeable share is in its first few filing cycles.
The profiled hosting system accounts for 1.8% (299) of 16,982 B2B firms with a detectable hosting system.
Yorkshire and The Humber and London each account for 11.7% (35) of the cohort, followed by the South East at 11.0% (33).
Detected sector tags skew towards Field Services & Trades at 27.1% (81), Construction at 24.4% (73), and Advanced Manufacturing at 19.1% (57).
Two co-detected website-builder technologies appear on 90.6% (271) and 89.6% (268) of the cohort, pointing to a fairly standardised small-business web stack.
For live B2B marketing calls, ICO guidance says organisations must screen against CTPS and TPS and must not call businesses that have objected.
Hosting & PaaS market share among UK B2B
Share of the 16,982 UK B2B with a detectable system. As of June 2026.
What else do IONOS-running B2B run?
Share of the 299 IONOS-running UK companies where each technology was also detected. As of June 2026.
Where IONOS B2B are, and how healthy they look
By region
By registered-office region; companies without a regional match count toward Rest of UK.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
6
Median headcount
£514.6K
Median UK turnover
2.3%
Above £5M turnover
12
Incorporated since 2022
575 verified decision-maker contacts
across these 299 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK B2B using IONOS
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 5 filingsDevelops cloud-based business software including dealer management, B2B trading, and warehouse management systems. Also provides bespoke web application and e‑commerce development, with tools for…
Serves B2B motorcycle, agriculture, groundcare and caravan dealerships, retailers and trade distributors, including vehicle, parts and workshop-led businesses.
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides application security consulting for software development, including secure coding practices, threat modelling, code review and testing. Also delivers fraud prevention systems, incident…
Serves B2B customers, primarily financial institutions and enterprise teams handling sensitive data, critical applications and high-value digital transactions, including development, security, risk…
Financial Health
StrongStrong · Hiring · 71% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsProvides technology consultancy and software development services, including digital transformation planning, data analytics, machine learning, IoT system design, mobile and MVP development, and…
Serves data-rich B2B organisations with complex processes, connected devices or legacy systems, including teams seeking software, data, AI, IoT or Dynamics 365 support for business-critical…
Financial Health
StableStable · 2% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsDevelops bespoke mobile applications, web software and cloud-based business systems. Provides custom software engineering, API integrations, UI/UX design, rapid prototyping, and DevOps services…
Serves B2B organisations needing digital products and operational systems, with sector focus on business services, manufacturing, healthcare, compliance-led organisations and hospitality.
Financial Health
StrongStrong · Hiring · 24% CAGR over 4y
Location
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Computed from 4 filingsDesigns and develops responsive websites for businesses, including bespoke sites, e‑commerce platforms and content‑management‑system driven websites. Provides website support services, email inbox…
Serves businesses across the UK needing responsive websites, eCommerce or bespoke CMS sites, along with email, domain and website support for their digital presence.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsProvides IT consulting and systems implementation services specialising in Salesforce CRM for charities, NGOs and small to medium organisations. Conducts system assessments, data management…
Serves small and growing charities, NGOs, non-profits, small to medium organisations, and in-country branches of international organisations in the UK and overseas, plus some for-profit companies.
Financial Health
StrongStrong · Profitable, Hiring · 57% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns and develops bespoke websites for businesses and organisations. Services include WordPress and custom web development, UI/UX design, branding, ecommerce website creation, SEO and digital…
Serves aspiring and established businesses and enterprise organisations worldwide seeking bespoke websites, branding, SEO and digital support.
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 5y
Location
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Computed from 3 filingsProvides maintenance and engineering services for telecommunications sites, including tower rigging, antenna and dish installation or removal, waveguide and radio link installation, Cat5/6 cabling,…
Serves telecommunications site owners and operators, communication service providers, mobile network operators, infrastructure contractors and public-sector bodies managing radio, mast and network…
Financial Health
StrongStrong · Hiring · 25% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides health, safety, fire and asbestos consultancy services, including risk assessments, fire safety compliance audits, CDM support, asbestos management, safety management systems setup, and…
Serves UK businesses and property sector clients, including residents’ associations, property management companies, building owners, facilities managers, construction firms, manufacturers, shops and…
Financial Health
HealthyHealthy · Growing, Hiring · 25% CAGR over 5y
Location
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Financial sub-scores
Computed from 5 filingsProvides search engine optimisation services for businesses, including technical SEO, AI search optimisation, link building, guest posting, digital PR, content marketing, copywriting and SEO audits…
Serves businesses worldwide, from SaaS startups and growing brands to large enterprises and S&P 500 companies, across multiple sectors seeking organic search and AI visibility support.
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
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Computed from 3 filingsProvides marketing services for retail, leisure and mixed‑use property destinations, including strategy, branding and design, digital advertising, social media, PR, events, research and placemaking…
Serves B2B clients managing or developing retail, leisure, mixed-use and hospitality destinations, including property owners, place managers, leasing teams and small local businesses.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 2y
Location
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Computed from 3 filingsProvides customs and excise consultancy, training, and compliance support for businesses importing or exporting goods. Advises on excise duties, alcohol regulations, duty returns, and customs…
Serves B2B customers including small to large traders, independent sole traders, warehouse keepers and supply chains involved in importing, exporting, customs and alcohol excise goods.
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides fundraising and fund placement advisory to private equity and alternative investment managers. Supports capital raising from institutional investors for buyout, venture capital, growth,…
Serves private equity and private capital fund managers, including first-time and complex fundraising teams, focused on European small to mid-cap buyout, venture capital, growth capital, private debt…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides digital marketing services for small businesses, including website design and development, search engine optimisation, link building, local and technical SEO, and management of paid…
Serves small businesses and other companies across multiple industries, targeting owners or marketing decision-makers seeking affordable support to grow online leads and sales.
Financial Health
StrongStrong · Growing, Hiring · 37% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides advisory services to international corporations, including financial institutions and alternative investment managers. Services include management team assessments, independent referencing,…
Serves international corporations, financial institutions and alternative investment managers evaluating leadership teams in private and public companies globally.
Financial Health
HealthyHealthy · Hiring · 32% CAGR over 2y
Location
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Computed from 5 filingsProvides corporate management and administrative services including company formation, registered office and company secretary services, virtual office facilities, preparation and filing of annual…
Sells to businesses and company owners needing company formation, registered office, company secretarial, virtual office and compliance support, including international clients seeking offshore…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides IT consulting focused on digital technologies for higher education institutions, including strategic advice, interim IT management, and delivery of technology projects and programmes for…
Serves higher education institutions, especially university IT and digital technology teams, and businesses needing experienced IT leadership, with additional relevance to manufacturing or automotive…
Financial Health
HealthyHealthy · -5% CAGR over 4y
Location
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Computed from 5 filingsProvides project management, cost management, building surveying and contract administration services for construction and property developments. Also offers employer’s agent roles, health and…
Serves property and construction clients, including developers, investors, public sector and local government bodies, and organisations delivering projects in education, healthcare, life sciences,…
Financial Health
StrongStrong · Hiring · 7% CAGR over 4y
Location
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Computed from 3 filingsProvides business consultancy services including business development support, funding and bid application assistance, learning and development programmes, education and teacher training, HR support,…
Serves businesses, community organisations, education and training providers, and sponsors seeking support with funding, bids, learning and development, teacher training, HR, CSR, courses and…
Financial Health
StableStable · 3% CAGR over 2y
Location
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Computed from 5 filingsProvides web design, web development, and branding services for organisations. Designs and builds websites, including ecommerce and content‑managed sites using Craft CMS, and offers ongoing website…
Serves organisations seeking web design, development and branding, including employers, education providers, charities and human rights groups, architecture studios and ecommerce brands. Targets…
Financial Health
StableStable · 0% CAGR over 5y
Location
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Computed from 3 filingsProvides registered office and director service address services, virtual business addresses, mail handling and forwarding, telephone answering, and company formation support, enabling companies to…
Sells to startups, SMEs, and UK or international limited companies needing a registered office, director service address, or virtual business address. Targets business owners who want to receive…
Financial Health
HealthyHealthy · Hiring · 22% CAGR over 2y
Location
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Computed from 4 filingsActs as an asset finance broker arranging funding for new and used business assets over fixed terms. Provides finance packages and funding options and assists customers with sourcing vehicles for…
Serves individuals and businesses seeking funding for new or used assets and vehicles, with customers needing structured finance packages typically over 12–60 months.
Financial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
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Computed from 5 filingsProvides accountancy and tax consultancy services, including preparation of financial statements, tax advice, and business consulting to support financial management, reporting, and planning for…
Serves entrepreneurs, business owners and companies seeking accountancy, tax and corporate planning support, with a regional focus implied by its Ilford-based positioning.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides water treatment and water hygiene services, including design, installation and maintenance of water treatment plant, Legionella risk assessments and control, system cleaning and…
Serves businesses and organisations with managed water systems, including hospitals, care homes, factories and project commissioning teams needing water hygiene, treatment and Legionella compliance…
Financial Health
StrongStrong · Growing, Hiring · 2% CAGR over 4y
Location
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Computed from 5 filingsProvides recruitment services for the construction industry, supplying temporary and permanent trades and labour staff. Sources, screens and places candidates, verifies right‑to‑work and skills, and…
Serves construction industry employers seeking temporary or permanent trades and labour staff, alongside tradespeople and labourers looking for construction roles in the UK.
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides consultancy and operational support to care homes and care services, including CQC-style audits, service reviews, clinical governance advice, medication management and care planning support,…
Serves B2B adult social care providers, especially care homes and care service operators, supporting owners, managers and clinical teams responsible for CQC compliance, governance and operational…
Financial Health
HealthyHealthy · Hiring · 13% CAGR over 4y
Location
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Computed from 5 filingsDesigns, manufactures, installs and services industrial ventilation systems, including local exhaust ventilation (LEV), dust and fume extraction, heat recovery and duct systems. Also provides…
Serves UK industrial and manufacturing businesses with workplace air quality and compliance needs, including sites with dust, fume, laboratory or process ventilation requirements, from small…
Financial Health
StrongStrong · Growing, Hiring · 74% CAGR over 5y
Location
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Computed from 3 filingsProvides IT recruitment services, sourcing and placing technology professionals for client organisations. Works with employers to identify hiring requirements and match candidates across a range of…
Serves businesses across the UK and internationally that need to hire IT and technology professionals, including employers seeking recruitment support for specialist technical roles.
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
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Computed from 5 filingsProvides environmental health and safety consultancy for the hospitality sector, including risk assessments, food safety and hygiene guidance, cleaning and PPE protocols, compliance support, and…
Serves B2B customers in the hospitality sector, particularly hotels with housekeeping, public-area, food safety and staff-training responsibilities, and managers accountable for health, safety and…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
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Computed from 5 filingsProvides web design, website development, SEO, social media management, email marketing, and graphic and logo design services. Builds and optimises business websites and plans and runs digital…
Sells to small businesses needing web design, branding and digital marketing support. Serves business owners across sectors including aesthetics, retail and creative services, with clients across…
Financial Health
StrongStrong · Hiring · 37% CAGR over 4y
Location
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Computed from 5 filingsProvides healthcare recruitment services, supplying trained care staff to care homes and healthcare providers. Sources and places temporary or shift-cover workers, matching personnel to client…
Sells to healthcare providers needing temporary or short-notice staffing, likely including care homes and other health and social care employers seeking skilled agency staff.
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
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Computed from 5 filingsProvides architectural design and masterplanning services for residential, commercial, education and hospitality developments, including student accommodation, sports facilities and transport…
Serves property developers, education institutions, commercial and hospitality operators, sport/leisure organisations, and owners of residential, conservation and transport-related projects.
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
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Computed from 3 filingsSupplies process equipment and valves for industrial applications, including bursting discs, flame arrestors, tank venting valves, steam systems, and hygienic process components. Provides…
Serves B2B process-industry customers across the UK and Europe, including chemical, food and drink, pharmaceutical, personal care, biotech, cosmetics, and oil and gas operators of varied scale.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
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Computed from 5 filingsProvides manned security guarding for commercial and institutional properties, including front-of-house reception security, concierge security for residential developments, CCTV monitoring, and…
Sells to businesses and institutions needing on-site security, including commercial property operators, corporate offices, housing developments, and education providers such as universities, colleges…
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 4y
Location
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Computed from 5 filingsProvides engineering design consultancy for machinery and production equipment, including concept design, detailed engineering, computer simulation, prototyping and testing. Supports OEMs and…
Serves B2B customers including OEMs, industrial equipment suppliers and manufacturers, with emphasis on pharmaceutical, food and dairy production machinery, and life sciences companies.
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
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Computed from 5 filingsDesigns and supplies medium‑voltage power capacitor banks up to 36kV, including metal‑enclosed and open terminal units, detuned banks and harmonic filter banks. Provides custom engineering, harmonic…
Serves B2B clients in electrical power distribution and heavy industry, including utilities, industrial sites and engineering contractors with medium-voltage power system requirements.
Financial Health
StrongStrong · Growing · 0% CAGR over 5y
Location
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Computed from 3 filingsProvides recruitment services connecting employers with job candidates across sectors including healthcare, hospitality, finance, and marketing. Supplies nurses, carers, and support workers to…
Serves care homes, hospitals and healthcare employers seeking nursing and care staff, alongside older people and other client groups needing care and social support at home.
Financial Health
StrongStrong · 2% CAGR over 2y
Location
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Computed from 3 filingsProvides electrical safety testing services including portable appliance testing (PAT), fixed installation inspection and testing, thermal imaging surveys, and electrical rectification work. Also…
Serves UK organisations and site operators needing electrical safety compliance support, including businesses with portable appliances, fixed installations, emergency lighting or fire alarm systems.
Financial Health
StableStable · -9% CAGR over 2y
Location
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Computed from 5 filingsTrades pharmaceutical and medical products, acting as an intermediary between suppliers and pharmacy-sector customers. Matches customer purchase orders with supplier trading agreements and provides…
Serves B2B buyers and suppliers in the pharmacy and pharmaceutical supply chain, including customers purchasing medical products in the UK market and, more recently, the EU.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 5y
Location
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Computed from 5 filingsInstalls and maintains electronic security systems including CCTV surveillance, access control and intruder alarms for commercial environments. Provides system design, multi‑site networked camera…
Serves commercial customers across all market sectors, from single-site businesses to multi-site organisations requiring security systems across varied environments and locations.
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
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Computed from 5 filingsProvides commercial waste management and recycling collection services, including paper and cardboard, glass, food waste, co‑mingled and residual waste. Supplies wheelie bins and front‑end loaders,…
Serves businesses across the West Midlands, Warwickshire and Staffordshire, from small sites needing wheelie-bin collections to larger premises using front-end loaders and segregated waste streams.
Financial Health
StableStable · -68% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical, electrical and public health (MEP) building services design, energy and dynamic thermal modelling, Part L compliance and EPC assessments, Passivhaus design, heat decarbonisation…
Serves public- and private-sector property clients across education, emergency services, commercial, leisure, residential, community, retail, transport and heritage sectors.
Financial Health
StableStable · Hiring · 11% CAGR over 4y
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Computed from 5 filingsProvides electronic design and engineering services for commercial, industrial, medical and automotive applications, including prototyping, production support, documentation, worst case circuit…
Serves B2B customers in commercial, industrial, medical and automotive sectors, including engineering and product development teams needing electronics design, manufacturing support and testing.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 5y
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Computed from 5 filingsProvides recruitment services for employers and job seekers, specialising in placing sales and technical professionals within the construction and engineering sectors. Advertises and fills temporary…
Serves construction and engineering employers hiring sales and technical staff, alongside job seekers seeking temporary or permanent roles in those sectors.
Financial Health
StrongStrong · Growing · 1% CAGR over 4y
Location
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Computed from 3 filingsProvides independent financial advice and planning for individuals and organisations, including investment planning, pension planning, estate and trust planning, corporate financial planning,…
Serves UK-based individuals, companies and organisations seeking financial advice, including investment, pensions, estate planning, corporate planning and employee benefits, with new clients taken…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 2y
Location
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Computed from 3 filingsProvides building services engineering design and energy consultancy for construction projects, including digital engineering, energy modelling, and building regulations compliance, supporting…
Serves B2B clients in the building services construction sector, including project teams, developers, contractors and organisations involved in low-carbon building projects.
Financial Health
StrongStrong · Growing, Hiring · 73% CAGR over 2y
Location
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Computed from 3 filingsDistributes heating and air conditioning equipment, including gas‑ and oil‑fired warm air units, air handling systems, and accessories. Supplies Multicalor and Lennox products and maintains stock of…
Serves UK heating and air-conditioning installation and service companies working with Multicalor and Lennox warm-air, air-handling and commercial HVAC systems.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
Location
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Computed from 4 filingsProvides fire safety services including supply and annual servicing of fire extinguishers, fire alarm maintenance, fire risk assessments, emergency lighting testing, evacuation chair supply and…
Serves businesses and organisations across the UK that need workplace fire safety compliance, including premises managers, facilities teams and employers responsible for fire equipment, risk…
Financial Health
StrongStrong · Hiring · 8% CAGR over 3y
Location
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Computed from 3 filingsProvides investment management and financial consultancy services, including fixed investment programmes and capital investment opportunities. Advises individuals, investor groups, and businesses on…
Serves companies, investor groups and individuals seeking capital investment income, including business owners looking to start or expand ventures across sectors such as real estate, leisure and…
Financial Health
WeakWeak
Location
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Computed from 3 filingsProvides roofing and waterproofing services including flat and pitched roof installation, mastic asphalt and bituminous membrane systems, liquid‑applied waterproofing, roof repairs and maintenance,…
Serves public sector bodies on local authority frameworks, private clients, and property owners or managers needing roofing, waterproofing and surfacing works, from reactive maintenance to major roof…
Financial Health
HealthyHealthy · Hiring · 94% CAGR over 2y
Location
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How IONOS usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. 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.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling. B2B companies are identified using Firmbase's semantic classification of company activity, built from filings, websites and registered SIC codes rather than SIC codes alone. The detected counts and share figures on this page are computed within that sector cohort, so "share" always means share of B2B companies with a detectable system — not of all UK companies.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
IONOS is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
How many UK B2B companies use IONOS?
What share of UK B2B companies run IONOS?
How is IONOS usage detected?
What size B2B companies use IONOS in the UK?
What do IONOS-running B2B companies also run?
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