| 123 PC UK Limited | Glasgow | 2014 |
| 123 Poppleton Road Limited | London | 2017 |
| 123 Repair Ltd | London | 2022 |
| 123 Robroyston RD Limited | Paisley | 2025 |
| 123 Standard Ltd | Rochdale | 2024 |
| 1230 the Women's Company Ltd | Beckenham | 2006 |
| 12345.TECH Limited | London | 2016 |
| 1235 Ltd | Edinburgh | 2018 |
| 12391820 Limited | London | 2020 |
| 123BAYSWATER Ltd | Leeds | 2010 |
| 123GO Logistics Ltd | Birmingham | 2018 |
| 123HELP4FAMILYS CIC | Bishop Auckland | 2022 |
| 123LEIC Limited | Bury St. Edmunds | 2024 |
| 124 the Elms RTM Ltd | London | 2014 |
| 12405662 Ltd | Worcester | 2020 |
| 125 F.P. Holdco Limited | London | 2025 |
| 125 F.P. Investment Limited | London | 2026 |
| 125 F.P. Propco Limited | London | 2025 |
| 125/127 ST Peters Road Management Limited | Louth | 2006 |
| 126 Aldenham Road Ltd | Watford | 2014 |
| 126 Cambray Road (Freehold) Limited | Stanmore | 2009 |
| 126 Z Barber Ltd | Brighton | 2026 |
| 127 Capital Investments Ltd | Canterbury | 2016 |
| 127 Solutions Ltd | Wirral | 2007 |
| 127 Tranmere Road Freehold Limited | London | 2018 |
| 129 Consultants Limited | Hampshire | 2008 |
| 13 Bolingbroke Grove (Freehold) Limited | London | 2002 |
| 13 Burlington Street Bath (Management) Limited | Bath | 1989 |
| 13 Clytha SQ Limited | Newport | 2025 |
| 13 EK Store Ltd | Bury | 2020 |
| 13 Recreation Road Limited | London | 2023 |
| 13 Roses Ltd | London | 2023 |
| 13 the Green Limited | Nottingham | 1972 |
| 130 Spa Limited | Huntingdon | 2013 |
| 1300 Limited | Hartlepool | 2015 |
| 1309 SO Beauty Ltd | Glasgow | 2025 |
| 1314 Events Ltd | Newport | 2024 |
| 13189139 Ltd | Birmingham | 2021 |
| 1320 Events Ltd | Hornchurch | 2018 |
| 133 by EL Ltd | Dewsbury | 2025 |
| 133 Melrose Avenue Management Company Limited | Hemel Hempstead | 1997 |
| 1337 Web Consulting Ltd. | London | 2024 |
| 134 the Mews Ltd | Wetherby | 2010 |
| 13450986 Ltd. | Luton | 2021 |
| 135 Hairdressing Limited | Wilmslow | 2011 |
| 136 Allison Road Limited | London | 2015 |
| 138 Clapham Common Ltd | London | 2014 |
| 138 Management Limited | Bexley | 2007 |
| 13809 Preservation Society Limited(The) | Sherwood Rise | 1984 |
| 13TH Side Studio Ltd | Sunderland | 2026 |
| 13TH Studios Limited | Croydon | 2023 |
| 14 and 14A Brunswick Road (Freehold) Ltd | Kingston Upon Thames | 2025 |
| 14 Barber Time Ltd | Wellingborough | 2025 |
| 14 Cambridge Gardens Management Company Limited | Tunbridge Wells | 2001 |
| 14 Chesham Place Freehold Limited | London | 2019 |
| 14 Curzon Street 1 Limited | London | 2010 |
| 14 Day Mani Limited | London | 2025 |
| 14 DRY Cleaners Ltd | London | 2010 |
| 14 Eardley Crescent Management Limited | Bracknell | 1995 |
| 14 East Street IOW Ltd | Ryde | 2024 |
| 14 Harley Road Management Limited | Harrow | 1996 |
| 14 Powell Road Limited | London | 2012 |
| 14 Sitaray Limited | Epping | 2018 |
| 14 Strathblaine Road Ltd | | 1998 |
| 140 Mitcham Lane Limited | London | 2016 |
| 140 Nails Ltd | London | 2025 |
| 140 Sutherland Avenue Limited | London | 2004 |
| 1402 Celsius Ltd | London | 2020 |
| 1402 NPW Ltd | Blackburn | 2016 |
| 1405 Publishing Ltd | Crowthorne | 2023 |
| 1407 Art London Ltd | Wembley | 2023 |
| 142 Bravington Road Freehold Limited | Edgware | 2019 |
| 142 East Reach Ltd | Taunton | 2026 |
| 143 Gloucester Avenue Limited | | 1984 |
| 143SPA Ltd | London | 2024 |
| 1441 Hair Ltd | Northampton | 2009 |
| 144A Lettings Limited | Edinburgh | 2017 |
| 144A Sales Limited | Edinburgh | 2017 |
| 144K AI Activations Academy Ltd | London | 2025 |
| 145 NP20 Ltd | Porth | 2023 |
| 1453 Ottoman Barber Ltd | Gateshead | 2025 |
| 147 Social Limited | Hull | 2020 |
| 148 Elgin Avenue Freehold Limited | London | 2016 |
| 1491 Ltd | London | 2018 |
| 1492 Limited | Wetherby | 2017 |
| 14:44 Spaces Ltd | Spalding | 2023 |
| 14SWORDS Ltd | St Leonards On Sea | 2025 |
| 15 Castle Gate Ltd | Nottingham | 1967 |
| 15 Dragon Parade Ltd | Leeds | 2014 |
| 15 Emmanuel Road Freehold Limited | Eastbourne | 2014 |
| 15 Goulton Road RTM Company Ltd | London | 2013 |
| 15 Mancave Hairdressing Ltd | Warrington | 2023 |
| 15 Mancave Ltd | Warrington | 2018 |
| 15 Oxford Road Barber Ltd | Altrincham | 2026 |
| 15 Richmond Road (Brighton) Limited | Hove | 2018 |
| 15 Southport Road RTM Company Limited | Chorley | 2016 |
| 15 ST Stephens Gardens Management Company Limited | | 2003 |
| 15 ST. Germans Place (NO.2) Limited | London | 1990 |
| 15 Stradbroke Road Management Company Limited | London | 2013 |
| 150 High Street Residences Limited | Glasgow | 2023 |