| 5G Roofing Ltd | Twickenham | 2025 |
| 5GCIVILS Ltd | Newark | 2022 |
| 5GFORMWORK Ltd. | West Malling | 2020 |
| 5H Renewable Energy Ltd | Marden | 2016 |
| 5HE'S Electric Ltd | Southampton | 2025 |
| 5IO Ltd | Enfield | 2015 |
| 5IVE Consulting Ltd | Leyland | 2024 |
| 5K Brickworks Ltd | Dartford | 1996 |
| 5K Construction Ltd | Leicester | 2025 |
| 5K Design & Build Limited | Dartford | 1999 |
| 5K Electrical Contractor Limited | Hinckley | 2017 |
| 5K Investments Limited | London | 2021 |
| 5KISAA Holdings Ltd | South Croydon | 2024 |
| 5KO Service Ltd | London | 2025 |
| 5KORNERS Ltd | Iver | 2025 |
| 5M Contracts Limited | Cookstown | 2026 |
| 5M2 Limited | Romford | 2024 |
| 5ML Limited | Hassocks | 2023 |
| 5MPARK Limited | London | 2016 |
| 5OCR Ltd | London | 2023 |
| 5OHO Ltd | Dagenham | 2018 |
| 5P Contracts Ltd | Salisbury | 2023 |
| 5P Fire Integrity Ltd | Enfield | 2026 |
| 5P Workforce Ltd Ltd | Dagenham | 2026 |
| 5P4RKY Ltd | Broxbourne | 2026 |
| 5PM Property Service Ltd | London | 2024 |
| 5PPPP Homes Limited | Sutton | 2025 |
| 5S Construction Services Ltd | Slough | 2019 |
| 5S Industrial Flooring Ltd | London | 2025 |
| 5S Property Ltd | Kettering | 2018 |
| 5STAR Conservatory Roof Solutions Limited | Hartlepool | 2023 |
| 5STAR Electricals, Plumbing & Heating Ltd | Bexley | 2025 |
| 5STAR Electrics Ltd | Horley | 2024 |
| 5STAR Elite Home Improvements Ltd | London | 2023 |
| 5STAR Flooring Services Limited | Kent | 2007 |
| 5STAR Roofcare Limited | Harrow | 2019 |
| 5STARRAIL Ltd | Bromley | 2023 |
| 5STARS Building Ltd | Hayes | 2017 |
| 5T Electrical & Developments Ltd | Wakefield | 2023 |
| 5TH Dimension Floors Limited | Wimborne | 2010 |
| 5TH GEN Ltd | Cheltenham | 2022 |
| 5TH Quarter Property Maintenance Ltd | Farnham | 2018 |
| 5TH.ELEMENT Corporation Ltd | London | 2021 |
| 5WAY Electric Ltd | Croydon | 2025 |
| 5X Fibre Ltd | Dereham | 2025 |
| 5YZD Group Ltd | Northolt | 2018 |
| 6 Angels Ltd | London | 2015 |
| 6 Brothers Brickwork Construction Ltd | Dagenham | 2024 |
| 6 C'S Mechanical Services Limited | Gainsborough | 2012 |
| 6 Castle Street Limited | Tunbridge Wells | 2020 |
| 6 Cheyne Walk Limited | Northampton | 2022 |
| 6 Claremont Limited | Tenterden | 2012 |
| 6 Core Ltd | Gillingham | 2024 |
| 6 CS Constructions Group Ltd | London | 2019 |
| 6 CVR Ventures Ltd | Merstham | 2019 |
| 6 Day Extensions Limited | London | 2026 |
| 6 Deerdykes Place Ltd | London | 2020 |
| 6 Energy Limited | Swansea | 2026 |
| 6 High Street Holdings Ltd | Swansea | 2019 |
| 6 High Street Ltd | London | 2025 |
| 6 Mill Common Limited | Kettering | 2018 |
| 6 Netherford Road Limited | Watford | 2007 |
| 6 RAK Limited | Birmingham | 2022 |
| 6 Stars Cleaning Solutions Ltd | Nottingham | 2023 |
| 6 Steps Project Management Limited | Hull | 2024 |
| 6 Westcombe Lane Ltd | Bideford | 2025 |
| 6-8 West Hill Ltd | London | 2021 |
| 60 Aldgate Limited | London | 2021 |
| 60 Curzon Street Developments Limited | London | 2014 |
| 60 East Street Ltd | Nottingham | 2025 |
| 60 Golborne Road Limited | London | 2019 |
| 60 Gracechurch (General Partner) Ltd | London | 2023 |
| 60 Gracechurch (Nominee 1) Ltd | London | 2023 |
| 60 Gracechurch (Nominee 2) Ltd | London | 2023 |
| 60 High Street Ltd | London | 2019 |
| 60 Mile Orchy Ltd | Dundee | 2024 |
| 60 Months Limited | Camberley | 2019 |
| 60 Station Developments Ltd | Bristol | 2017 |
| 60 Victoria Street Leasing Limited | London | 2020 |
| 603 Limited | Radstock | 2014 |
| 61 Brighton Road Limited | Chichester | 2014 |
| 61 Great Cumberland Place Limited | London | 1983 |
| 61 Montagu Ltd | London | 2025 |
| 61-62 Western Road Limited | Brighton | 2015 |
| 610 TM Limited | Choppington | 2022 |
| 612 Properties Limited | Coalville | 2016 |
| 613 Manc Limited | London | 2018 |
| 613 Plumbing & Heating Ltd | Solihull | 2018 |
| 615 Scaffolding Limited | Wallsend | 2024 |
| 618 Sutton Limited | London | 2014 |
| 62 Kensington Ltd | Croydon | 2022 |
| 62 Paddington Exchange Limited | Wellingborough | 2016 |
| 62 Park Street Bristol Limited | Bristol | 2024 |
| 629 Clydach Road Ltd | Swansea | 2017 |
| 62SIX Developments Ltd | Haverfordwest | 2020 |
| 63 Beans Ltd | Stevenage | 2014 |
| 63 Construct Ltd | Ruislip, | 2025 |
| 63 Gresham Limited | London | 2025 |
| 63 KEW Road Limited | London | 2022 |
| 63 KEW Road UK Holdings Limited | London | 2023 |