| 112786 Limited | Bradford | 2017 |
| 113 Group Ltd | Sidcup | 2022 |
| 113 Holloway Road Ltd | London | 2017 |
| 113 Nightingale Road N22 Limited | Barnet | 2010 |
| 113 Spring UK Limited | London | 2024 |
| 1130.WORKS UK Limited | Ipswich | 2024 |
| 11383500 Ltd. | Cradley | 2018 |
| 114 Artist Management Limited | Oakham | 2022 |
| 114 Index Limited | Glasgow | 2025 |
| 114 Travel Ltd | Wilmslow | 2024 |
| 114 Windmill Road Limited | London | 2017 |
| 117 Brook Drive (Freehold) Limited | London | 2010 |
| 117 King Henrys Road Limited | London | 1995 |
| 117 ST. George's Square (Pimlico) Limited | London | 1995 |
| 117 Taybridge Road Ltd. | London | 2023 |
| 118 Security Ltd | Rainham | 2018 |
| 1188 Travel Ltd | Bromley | 2025 |
| 119 Abbeville Road Limited | Hampton | 2002 |
| 11912584 Limited | Warrington | 2019 |
| 11:11 Marketing Ltd | Wirral | 2019 |
| 11:11 Travels Ltd | Cardiff | 2025 |
| 11:11EVNTS Ltd | London | 2025 |
| 11BOS Limited | Barnet | 2026 |
| 11D Limited | St Albans | 2017 |
| 11PLUSGENIE Ltd | Colchester | 2016 |
| 11S Consulting Limited | Ingatestone | 2017 |
| 11STONE Limited | London | 2022 |
| 11TH Dimension Ltd | Leigh-On-Sea | 2018 |
| 11THSABREGROUP Consultancy Ltd | Devon | 2019 |
| 11VC Ltd | Winchmore Hill | 2026 |
| 12 - 22 Peveril Crescent RTM Company Limited | Manchester | 2010 |
| 12 27 Ltd | London | 2020 |
| 12 Advisors Limited | Woodford Green | 2003 |
| 12 Cleaning Company Limited | Harrow | 2021 |
| 12 Degrees Limited | Cambridge | 2006 |
| 12 Dyne Road Limited | London | 2009 |
| 12 Elmers Drive Management Company Limited | Middlesex | 2002 |
| 12 June Investments Limited | Saffron Walden | 2025 |
| 12 Knights Security Ltd | West Drayton | 2026 |
| 12 Market Cross Place Limited | Clacton-On-Sea | 2019 |
| 12 Miles North Limited | Barnsley | 2021 |
| 12 Newbridge Road (Bath) Management Company Limited | Bath | 2013 |
| 12 Oxford Road Freehold Ltd | London | 2016 |
| 12 Plus UK Limited | Chichester | 2000 |
| 12 Priory Road Limited | London | 2022 |
| 12 Recruitment Ltd | Hemel Hempstead | 2024 |
| 12 Rounds Management Limited | London | 2024 |
| 12 Smithfield General Partner Limited | London | 2007 |
| 12 Star Consultancy Ltd | Ilford | 2023 |
| 12 Twins Motors Ltd | Dagenham | 2022 |
| 12 Victoria Square (Newcastle) Management Company Limited | Newcastle Upon Tyne | 2004 |
| 12 Wake Green Road Management Limited | Birmingham | 1977 |
| 12 York Grove SE15 RTM Company Limited | London | 2004 |
| 12-16 HS Walton Limited | London | 2017 |
| 12/64 Events Ltd | Glasgow | 2025 |
| 120 Goodrich Road Limited | London | 2000 |
| 120 PR Limited | Glasgow | 2017 |
| 120 the High Road Limited | Birmingham | 2024 |
| 121 Business Consultancy Limited | Croydon | 2026 |
| 121 Business Links Limited | Consett | 2024 |
| 121 Change Limited | Beccles | 2019 |
| 121 Fragrance Ltd | Ilford | 2017 |
| 121 Holdings Ltd | London | 2025 |
| 121 Home Help Ltd | Eastbourne | 2020 |
| 121 HR Limited | Croydon | 2016 |
| 121 Jobs Limited | London | 2015 |
| 121 Kings Road Limited | London | 2006 |
| 121 Legal Recruitment Limited | Liverpool | 2014 |
| 121 Select Recruitment Ltd | Liverpool | 2015 |
| 121 Service Control Ltd | Enfield | 2026 |
| 121 Services(Uk) Limited | Southall | 2024 |
| 121 Warehousing Limited | Edinburgh | 2020 |
| 1210 Ltd | Greenford | 2019 |
| 1210 Solutions Ltd | London | 2021 |
| 1215 Ltd | London | 2011 |
| 12188987 Limited | Nottingham | 2019 |
| 121PRODATA Limited | London | 2006 |
| 121SECURITYUK Ltd | Port Talbot | 2014 |
| 1226 Management Limited | Cardiff | 2026 |
| 1228 Group Limited | London | 2024 |
| 123 ABC Controls Limited | Glasgow | 2024 |
| 123 Accounts Ltd | March | 2020 |
| 123 Air Limited | Hornchurch | 2022 |
| 123 Alarms Ltd | Maidstone | 2013 |
| 123 AP Limited | London | 2019 |
| 123 Boats Ltd | Ormskirk | 2025 |
| 123 Camps Ltd | Wellingborough | 2016 |
| 123 Claim Ltd | Brentwood | 2022 |
| 123 Clean Ltd | Exmouth | 2017 |
| 123 Cleaning Ltd | Burnham-On-Crouch | 2019 |
| 123 Employees Ltd | Grimsby | 2016 |
| 123 FIX Ltd | London | 2026 |
| 123 Group Ltd | Skegness | 2022 |
| 123 Holding Group Ltd | London | 2025 |
| 123 Lighting Ltd | London | 2011 |
| 123 London Limited | Loughton | 2022 |
| 123 Parkway Limited | Saltash | 2014 |
| 123 Print Limited | West Glamorgan | 2006 |
| 123 Recruitment UK Ltd | Cardiff | 2018 |
| 1234 Engineering Limited | Hereford | 2008 |