| 56K Productions Limited | Manchester | 2025 |
| 57 Festivals Ltd | London | 2009 |
| 57 Play Limited | London | 2026 |
| 57 Presents Ltd | London | 2022 |
| 571 Film Production Limited | London | 2020 |
| 5778K Ltd | London | 2021 |
| 58 Degrees North Ltd | Wick | 2020 |
| 58 Management Ltd | Upminster | 2011 |
| 58N Production Company Ltd | Helensburgh | 2024 |
| 59 Design Ltd | Middlesex | 2014 |
| 59 Productions City of Glass Limited | London | 2015 |
| 59CLUB Global Ltd | Tamworth | 2008 |
| 5B Artists and Media Ltd | Abingdon | 2017 |
| 5CORE Ltd | Banbury | 2019 |
| 5D Theatre CIC | London | 2026 |
| 5EEN Ltd | Glasgow | 2024 |
| 5FIVE Sport Management Ltd | London | 2025 |
| 5FL Ltd | London | 2025 |
| 5IVE7 Productions Ltd | Pinner | 2014 |
| 5IVES Community Sports Club | Barnsley | 2014 |
| 5K2PB Limited | Cardiff | 2019 |
| 5LCK Limited | London | 2021 |
| 5ONE Fitness Ltd | Buxton | 2023 |
| 5PLUS1 UK Minifootball Ltd | Banbury | 2023 |
| 5PLUS2 Limited | London | 2017 |
| 5RIVERS Barnstaple Limited | Erith | 2025 |
| 5RIVERS Larne Ltd | Erith | 2025 |
| 5SPORT Limited | Wakefield | 2021 |
| 5STAR Live Limited | Herne Bay | 2012 |
| 5STAR Sports Agency Limited | Richmond | 2017 |
| 5TH Column Studio Limited | Cambridge | 2022 |
| 5TH Element JIU Jitsu Academy CIC | Spennymoor | 2024 |
| 5TH Element JIU Jitsu Limited | Durham | 2019 |
| 5TH Helena Drive Productions Limited | London | 2026 |
| 6 C Luxe Design Ltd | Buckingham | 2011 |
| 6 Degrees Motorsport Ltd | Tamworth | 2025 |
| 6 Degrees Sport Ltd | Saltash | 2011 |
| 6 Kitchen Ltd | London | 2026 |
| 6 Love Sports Coaching Limited | Hastings | 2014 |
| 6 Pockets Limited | Leamington Spa | 2024 |
| 6 Studz Sports Ltd | London | 2025 |
| 6 Week (Southampton) Ltd | Southampton | 2023 |
| 6 Week Challenge (Ringwood) Ltd | Ringwood | 2021 |
| 6-S Performance Ltd | Morpeth | 2018 |
| 60 Miles by Road OR Rail Ltd | Northampton | 2019 |
| 60 UP C.I.C. | London | 2013 |
| 600 EML Ltd | Ruislip | 2020 |
| 600 Racing (UK) Ltd | Surrey | 2006 |
| 601 Engineering Solutions Limited | Dunstable | 2014 |
| 6010 Conversions Ltd | Worcester | 2020 |
| 605 Strength & Conditioning Limited | Bristol | 2013 |
| 606 Strength & Conditioning Ltd | Bradford | 2018 |
| 62 West Studio Ltd | West Drayton | 2020 |
| 622 Ltd | Darlington | 2018 |
| 63 Sports Management Ltd | London | 2026 |
| 63EPR Limited | Kidlington | 2021 |
| 64 Million Artists Ltd | Stroud | 2014 |
| 65 SQM Ltd | Benfleet | 2024 |
| 65 UP Ltd | Alderley Edge | 2022 |
| 65RACING Ltd | Stafford | 2025 |
| 66 Adventure Ltd | Ludlow | 2018 |
| 664 Events Limited | Wellingborough | 2025 |
| 666 Fitness Ltd | Ashton-Under-Lyne | 2026 |
| 666743 Limited | Bromsgrove | 2024 |
| 666RECORDS Ltd | Norwich | 2020 |
| 67 Management Ltd | Downpatrick | 2019 |
| 679 Recordings Limited | London | 2001 |
| 68 Events Ltd | Cinderford | 2025 |
| 686 Ltd | London | 2025 |
| 6AM Cycling Limited | London | 2015 |
| 6AM Systems Ltd | Doncaster | 2025 |
| 6BRIGHTSTUNTS Limited | Telford | 2020 |
| 6D Group Ltd | Spalding | 2015 |
| 6EQUJ5 Ltd | London | 2023 |
| 6FOOT6 Productions Ltd | Windsor | 2019 |
| 6FOOTSTORIES Ltd | Westcliff-On-Sea | 2013 |
| 6FS Limited | London | 2019 |
| 6IXSIDE Ltd | Potters Bar | 2024 |
| 6IXTY8EVENTS Limited | Grays | 2025 |
| 6MM Events Ltd | Atherton | 2020 |
| 6MM Slingers Ltd | Liphook | 2024 |
| 6OCCER Limited | Keston | 2014 |
| 6SHOT Ltd | Teddington | 2025 |
| 6THVISION Limited | Bath | 2004 |
| 7 1/4" Gauge Society Limited | Cheltenham | 2000 |
| 7 Academy of Performing Arts Ltd | Telford | 2019 |
| 7 Burgers RFC Limited | East Grinstead | 2026 |
| 7 Creative Limited | Brighton | 2001 |
| 7 Days Fitness Ltd | Rotherham | 2024 |
| 7 Elite Academy Trust | Liverpool | 2020 |
| 7 Elite Academy UK Ltd | Liverpool | 2019 |
| 7 Gyms Limited | Billericay | 2017 |
| 7 High Ltd | London | 1995 |
| 7 Mountains Productions Ltd | London | 2018 |
| 7 Saka Limited | North Chingford | 2018 |
| 7 Sister Records Ltd | Chichester | 2021 |
| 7 Sports Management Limited | Croydon | 2010 |
| 7 Star Entertainment Ltd | Leicester | 2017 |
| 7 Times Sports Consulting Limited | Liverpool | 2019 |
| 7 Valleys Media & Management (U.K.) Ltd | Leicester | 2016 |