Top Telecoms Companies in the UK
There are 17,254 telecoms companies in the UK. This page breaks that total down the way a list actually gets built — by sub-industry, by location, and by company size — so you can see how big the addressable slice is before you commit budget to a campaign.
Leading telecoms companies
Ranked by employee band. Companies House does not publish revenue, and its employee figures are unreliable, so bands come from verified company profiles.
| # | Company | Website | Employees |
|---|---|---|---|
| 1 | Vodafone | vodafone.com | 10,000+ |
| 2 | BT Group | bt.com | 10,000+ |
| 3 | Telecom Jobs | telecomjobs.uk | 2–10 |
| 4 | IHS Towers | ihstowers.com | 1,001–5,000 |
| 5 | Colt Technology Services | colt.net | 5,001–10,000 |
| 6 | Virgin Media | virginmediao2.co.uk | 10,000+ |
| 7 | GSMA | gsma.com | 501–1,000 |
| 8 | O2 (Telefónica UK) | o2.co.uk | 10,000+ |
| 9 | Liberty Global | libertyglobal.com | 10,000+ |
| 10 | Openreach | openreach.co.uk | 10,000+ |
| 11 | CityFibre | cityfibre.com | 1,001–5,000 |
| 12 | Three UK | three.co.uk | 1,001–5,000 |
| 13 | Inmarsat | viasat.com | 5,001–10,000 |
| 14 | Africell Group | africell.com | 1,001–5,000 |
| 15 | Monty Mobile | montymobile.com | 501–1,000 |
| 16 | Helios Towers | heliostowers.com | 501–1,000 |
| 17 | Total Telecom | totaltele.com | 11–50 |
| 18 | Lyca Mobile UK | lycamobile.co.uk | 5,001–10,000 |
| 19 | Eutelsat OneWeb | oneweb.net | 201–500 |
| 20 | Ofcom | ofcom.org.uk | 501–1,000 |
| 21 | TalkTalk | talktalk.co.uk | 201–500 |
| 22 | TM Forum | tmforum.org | 51–200 |
| 23 | Boldyn Networks | boldyn.com | 501–1,000 |
| 24 | Telent Technology Services Ltd | telent.com | 1,001–5,000 |
| 25 | MainOne | mainone.net | 201–500 |
| 26 | Evolving Systems | evolving.com | 201–500 |
| 27 | Gamma | gammagroup.co | 1,001–5,000 |
| 28 | China Telecom Europe | chinatelecomeurope.com | 201–500 |
| 29 | Flint International | flint-international.com | 51–200 |
| 30 | Arqiva | arqiva.com | 1,001–5,000 |
| 31 | Hyperoptic | hyperoptic.com | 1,001–5,000 |
| 32 | Virgin Media Business | virginmediabusiness.co.uk | 1,001–5,000 |
| 33 | GCX | gcxworld.com | 1,001–5,000 |
| 34 | 5GWorldPro.com 5G Training & Consulting Company | 5gworldpro.com | 2–10 |
| 35 | Telecom Recruitment Ltd | telecomrecruitment.co.uk | 11–50 |
| 36 | Nextgen Clearing Ltd | nextgenclearing.com | 201–500 |
| 37 | Capacity - a techoraco brand | capacityglobal.com | 51–200 |
| 38 | Kelly Group | kelly.co.uk | 1,001–5,000 |
| 39 | Connect Fibre | connectfibre.co.uk | 51–200 |
| 40 | TelcoTitans | telcotitans.com | 11–50 |
| 41 | Gigaclear | gigaclear.com | 501–1,000 |
| 42 | JT Group Limited | jtglobal.com | 501–1,000 |
| 43 | Community Fibre Limited | communityfibre.co.uk | 501–1,000 |
| 44 | 3G4G | 3g4g.co.uk | 2–10 |
| 45 | Mobile Systems International (MSIUK) | msiuk.com | 201–500 |
| 46 | Interoute | exainfra.net | 501–1,000 |
| 47 | BT Wholesale | btwholesale.com | 10,000+ |
| 48 | Morrison Telecom Services | morrisonts.co.uk | 501–1,000 |
| 49 | Cornerstone | cornerstone.network | 201–500 |
| 50 | OmobioNG | omobio.net | 51–200 |
Need the full list with verified decision-maker contacts? Book a meeting.
The largest sub-industry is other telecommunications activities with 10,049 companies, which is where most telecoms outbound in the UK ends up pointed. The tail below it is usually less contested and worth a separate sequence.
Geographically it concentrates in London (3,437 companies), followed by Manchester, Birmingham, Liverpool. If your reps work by territory, that split is the fastest way to divide the list.
By headcount, 3,352 are micro companies of 1–9 people and 314 sit in the 10–249 range — usually the sweet spot for outbound, since they are large enough to have a budget holder and small enough that the decision maker answers.
Telecoms by sub-industry
| Sub-industry | Companies |
|---|---|
| Other telecommunications activities | 10,049 |
| Wired telecommunications activities | 3,823 |
| Wireless telecommunications activities | 2,738 |
| Satellite telecommunications activities | 631 |
| Sea and coastal water transport | 12 |
| Inland water transport | 1 |
Where telecoms companies are based
| City | Companies |
|---|---|
| London | 3,437 |
| Manchester | 285 |
| Birmingham | 268 |
| Liverpool | 228 |
| Glasgow | 204 |
| Reading | 203 |
| Cardiff | 200 |
| Bristol | 196 |
| Leeds | 192 |
| Nottingham | 159 |
Telecoms by company size
| Employees | Companies |
|---|---|
| 1–9 | 3,352 |
| 10–49 | 280 |
| 50–249 | 34 |
| 250–999 | 2 |
Headcount is published for 5,258 of these companies; the rest are in the database without a size band.
Frequently asked questions
How many telecoms companies are there in the UK?
Our data covers 17,254 telecoms companies in the UK, sourced from Companies House and refreshed continuously.
Can I get decision-maker contacts for telecoms companies?
Yes. Every company record can be paired with verified decision-maker contacts — names, job titles, verified email addresses and direct phone numbers. Book a meeting and we will scope the list against your ICP.
How is the telecoms segment defined?
Companies are classified using official industry codes from the business register, not keyword guesses on company names, so the segment boundaries match what the company actually registered as.