| 19WHM Ltd | Real estate | 2025 |
| 19YNS Ltd | Real estate | 2024 |
| 1: Eleven Clothing Limited | Manufacturing | 2021 |
| 1:1 Diet by Cambridge Weight Plan With Maya Ltd | Wholesale & retail | 2019 |
| 1:59 Partners LLP | | 2024 |
| 1:9:90 Consulting Limited | Professional & scientific | 2021 |
| 1:9:90 Futures Limited | Financial services | 2025 |
| 1:9:90 Holdings Limited | Financial services | 2020 |
| 1A - 1B ST Faiths Road Management Company Limited | Households | 2015 |
| 1A Canonbury Lane Ltd | Real estate | 2023 |
| 1A Connect Limited | Administrative & support | 2022 |
| 1A Connor Street Residents Limited | Households | 2003 |
| 1A Dersingham Road Residents Ltd | Households | 2024 |
| 1A Dorset Road N15 Management Company Limited | Households | 2002 |
| 1A Drayton Park Ltd | Real estate | 2018 |
| 1A Elsworthy Rise Limited | Real estate | 2023 |
| 1A Eventos Ltd | Hospitality | 2026 |
| 1A Fauconberg Road Limited | Households | 2011 |
| 1A Florence Road RTM Company Limited | Other services | 2015 |
| 1A Gastein Road Management Limited | Households | 2006 |
| 1A Halsmere Road Limited | Real estate | 2018 |
| 1A Investments Ltd | Real estate | 2019 |
| 1A Narbonne Avenue Management Company Limited | Households | 2025 |
| 1A Orsman Road Management Limited | Households | 2015 |
| 1A Orthodontics Limited | Health & social care | 2010 |
| 1A Productions Limited | Information & communication | 1992 |
| 1A Properties Ltd | Real estate | 2020 |
| 1A Training Ltd | Education | 2015 |
| 1A Visa Consulting Limited | Other services | 2024 |
| 1A Wells Road Management Limited | Real estate | 2021 |
| 1A Woodstock Road RTM Company Limited | Households | 2024 |
| 1A-1D Dawlish Road RTM Company Ltd | Households | 2016 |
| 1A-SOLUTIONS Ltd | Extraterritorial | 2023 |
| 1A2B Cars Ltd | Transport & logistics | 2024 |
| 1A3M Studio Ltd | Information & communication | 2023 |
| 1AAB Ltd. | Real estate | 2020 |
| 1AAM Ltd | Real estate | 2025 |
| 1AB Management RTM Company Limited | Households | 2020 |
| 1ACCORD Living Ltd | Health & social care | 2020 |
| 1ADL FIC Ltd | Financial services | 2024 |
| 1ALL-IN-ONE Ltd | Wholesale & retail | 2025 |
| 1APP Energy Ltd | Information & communication | 2026 |
| 1ARDG Ltd | Real estate | 2022 |
| 1ASP Ltd | Wholesale & retail | 2026 |
| 1B Trade Limited | Wholesale & retail | 2017 |
| 1B Estates Ltd | Real estate | 2025 |
| 1B Haydon Park Road RTM Company Limited | Households | 2025 |
| 1B Ltd | Professional & scientific | 2012 |
| 1B Property Limited | Real estate | 2019 |
| 1B Services Limited | Administrative & support | 2024 |
| 1B TAP House Ltd | Hospitality | 2023 |
| 1BC Studios Ltd | Information & communication | 2022 |
| 1BCD Annette Road (Freehold) Limited | Households | 2008 |
| 1BD Coaching Limited | Professional & scientific | 2025 |
| 1BERMONDSEY-GRYKOS Ltd | Hospitality | 2025 |
| 1BETCO Ltd | Information & communication | 2025 |
| 1BIGRIG Ltd | Professional & scientific | 2021 |
| 1BLKICETOPSHELF Ltd | Manufacturing | 2021 |
| 1BOARD Ltd | Information & communication | 2019 |
| 1BOX PA Limited | Administrative & support | 2022 |
| 1BREADCRUMB UK Ltd | Information & communication | 2023 |
| 1BRER Ltd | Wholesale & retail | 2025 |
| 1C Property Developments Limited | Construction | 2024 |
| 1C&D Drayton Park Ltd | Real estate | 2023 |
| 1C6 Films Ltd | Information & communication | 2026 |
| 1CARE Health Ltd | Professional & scientific | 2024 |
| 1CASE Ltd | Information & communication | 2025 |
| 1CC Games Ltd | Information & communication | 2020 |
| 1CE Travel Ltd | Administrative & support | 2024 |
| 1CENTRA Holdings Ltd | Financial services | 2023 |
| 1CH Limited | Administrative & support | 2026 |
| 1CHANCE Ltd | Professional & scientific | 2026 |
| 1CHILDCONSULTANCY Ltd | Professional & scientific | 2025 |
| 1CLOSE AI Limited | Information & communication | 2026 |
| 1COACH Pro(Uk) Ltd | Transport & logistics | 2022 |
| 1CONSULTING Group Ltd | Information & communication | 2015 |
| 1COUNSEL Limited | Professional & scientific | 2019 |
| 1CRE8 Ltd | Other services | 2011 |
| 1CRM Ltd | Professional & scientific | 2007 |
| 1CRNTH13:4 Ltd | Wholesale & retail | 2026 |
| 1CS Holdings Limited | Information & communication | 2023 |
| 1CT (London) Ltd | Real estate | 2022 |
| 1CYPHER Ltd | Information & communication | 2014 |
| 1D Cowthorpe Limited | Real estate | 2018 |
| 1D Media Limited | Arts & recreation | 2010 |
| 1DAY Design Ltd | Information & communication | 2020 |
| 1DAY Workout Systems Ltd | Professional & scientific | 2025 |
| 1DEAL4ALL Ltd | Wholesale & retail | 2018 |
| 1DEGREE RE Limited | Real estate | 2025 |
| 1DELUXE Limited | Wholesale & retail | 2023 |
| 1DENT Limited | Wholesale & retail | 2023 |
| 1DG Services Ltd | Manufacturing | 2019 |
| 1DIGINET Ltd | Information & communication | 2023 |
| 1DIGITALTRUST Ltd | Information & communication | 2021 |
| 1DMPG LLP | | 2025 |
| 1DR Property Limited | Real estate | 2018 |
| 1DRIVING Ltd | Education | 2020 |
| 1DRIVING Test Services Ltd | Administrative & support | 2021 |
| 1DRYVN Ltd | Wholesale & retail | 2025 |
| 1DS Projects Ltd | Construction | 2022 |