| 109 Cathedral Road Holdings Limited | Real estate | 2019 |
| 109 Cathedral Road Management Limited | Real estate | 2019 |
| 109 Cathedral Road Owners Limited | Households | 2025 |
| 109 CXR RHL Ltd | Households | 2018 |
| 109 Inc. Ltd | Wholesale & retail | 2021 |
| 10903560 Limited | Wholesale & retail | 2017 |
| 10FOOT Limited | Arts & recreation | 2018 |
| 10SIX Games Limited | Information & communication | 2024 |
| 10X Driving School Ltd | Education | 2025 |
| 10XRUPT Ltd | Wholesale & retail | 2025 |
| 11 Adamsdown Square Management Company Limited | Households | 2007 |
| 11 Heol Merlin Management Company Limited | Hospitality | 2009 |
| 11 Waterside Holdings Ltd | Real estate | 2021 |
| 110 Fidlas Road Management Company Limited | Real estate | 2018 |
| 110 Paget Street Management Ltd | Households | 2020 |
| 11003460 Limited | Wholesale & retail | 2017 |
| 1109 Sneakers Ltd | Wholesale & retail | 2021 |
| 1111 Shooters Limited | Wholesale & retail | 2022 |
| 111280 Ltd | Administrative & support | 2020 |
| 11229269 Ltd | Public administration | 2018 |
| 11258924 Ltd | Extraterritorial | 2018 |
| 113 Habershon Street Management Limited | Households | 2017 |
| 11328564 Ltd | Information & communication | 2018 |
| 1138 Ltd | Professional & scientific | 2021 |
| 114 Cathedral Road Management Company Limited | Households | 2011 |
| 1145 Food Serivices Ltd | Hospitality | 2017 |
| 115 Claude Road RTM Company Limited | Real estate | 2013 |
| 11577710 Ltd | Information & communication | 2018 |
| 11624291 Ltd | Manufacturing | 2018 |
| 11758803 Ltd | Wholesale & retail | 2019 |
| 118 W-Road Management Ltd | Households | 2023 |
| 11803487 Ltd | Information & communication | 2019 |
| 11892779 Limited | Financial services | 2019 |
| 119 Ltd | Real estate | 2013 |
| 119 Penylan Road Management Co Limited | Households | 2008 |
| 119C Ltd | Real estate | 2021 |
| 11:11 Travels Ltd | Administrative & support | 2025 |
| 11ROMILLYROADMANAGEMENT Ltd | Households | 2021 |
| 11TH Hour Events Limited | Arts & recreation | 2006 |
| 11TH Hour Ice Limited | Arts & recreation | 2016 |
| 12 Beach Court Ltd | Real estate | 2023 |
| 12 Cwrt Y Parc Management Company Limited | Real estate | 2016 |
| 12 Electrical & Emergency Electrician Ltd | Construction | 2025 |
| 12 Piercefield Place Ltd | Real estate | 2015 |
| 12-38 (Evens) CAE Alaw Goch RTM Company Limited | Real estate | 2021 |
| 120 Clifton Street Limited | Hospitality | 2020 |
| 1201 Limited | Information & communication | 2003 |
| 12026832 Limited | Professional & scientific | 2019 |
| 12074759 Limited | Other services | 2019 |
| 121 Personnel Care Ltd | Health & social care | 2024 |
| 121 Property Solutions SW Ltd | Real estate | 2023 |
| 121RAILWAYSTREET Management Company Ltd | Households | 2021 |
| 122 & 122A Pembroke Road Ltd | Households | 2019 |
| 12213407 Ltd | Construction | 2019 |
| 1226 Management Limited | Administrative & support | 2026 |
| 123 Bedford Estates Ltd | Professional & scientific | 2025 |
| 123 Homes Limited | Real estate | 2017 |
| 123 Law Limited | Professional & scientific | 2021 |
| 123 Property and Building Consultancy Ltd | Real estate | 2023 |
| 123 Recruitment UK Ltd | Administrative & support | 2018 |
| 123 Services Leicester Limited | Wholesale & retail | 2017 |
| 123-INSUREME Ltd | Information & communication | 2013 |
| 1234 Limited | Information & communication | 2006 |
| 124 Newport Road Management Limited | Households | 2022 |
| 12552492160924 Ltd | Wholesale & retail | 2020 |
| 126 Cardiff Road Llandaff Management Company Limited | Households | 2003 |
| 126 Cathedral Road Holdings Limited | Real estate | 2021 |
| 126 Cathedral Road Management Limited | Real estate | 2021 |
| 126 Cathedral Road Owners Limited | Households | 2025 |
| 128 Cathedral Road Management Company Limited | Households | 2011 |
| 12808223 Limited | Construction | 2020 |
| 1281 Holdings Ltd | Manufacturing | 2021 |
| 12859826 Ltd | Construction | 2020 |
| 12883242 Ltd | Professional & scientific | 2020 |
| 12993095 Ltd | Manufacturing | 2020 |
| 12D Model Ltd | Mining & quarrying | 2022 |
| 13 Media Arts Ltd | Information & communication | 2013 |
| 13 One 13 Limited | Real estate | 2016 |
| 13 Theobald Road Management Ltd | Administrative & support | 2016 |
| 13042524 Ltd | Financial services | 2020 |
| 130578 Ltd | Administrative & support | 2020 |
| 13321953 Limited | Wholesale & retail | 2021 |
| 136 Warwick Way Limited | Administrative & support | 2001 |
| 136-138 Llandaff Road RMC Ltd | Administrative & support | 2016 |
| 137 Cathedral Road Property Management Company Limited | Households | 2019 |
| 13804263 Ltd | Extraterritorial | 2021 |
| 13FIELDS Ltd | Information & communication | 2015 |
| 14 Knots Ship Management PC | | 2021 |
| 14 Ltd | Hospitality | 2019 |
| 14 Peaks Ltd. | Wholesale & retail | 2023 |
| 14 Stars Market Harborough Limited | Health & social care | 2024 |
| 1430 Stores Ltd | Wholesale & retail | 2026 |
| 14694921 Ltd | Administrative & support | 2023 |
| 14751943 Limited | Hospitality | 2023 |
| 148 Cathedral Road Management Company Limited | Households | 2013 |
| 14STARS UK Limited | Wholesale & retail | 2009 |
| 15 GER Management Limited | Households | 2018 |
| 15 Lostwithiel Street Management Company Limited | Real estate | 2007 |
| 15 New Street Trading Ltd | Hospitality | 2026 |
| 15 PEN Y LAN Road Management Company Limited | Real estate | 2019 |