| 3 Crowns Property & Maintenance Contractors Ltd | Construction | 2021 |
| 3 D Air Sales Limited | Wholesale & retail | 1997 |
| 3 G Telecommunications Limited | Information & communication | 2005 |
| 3 Park Crescent (Freehold) Limited | Real estate | 2022 |
| 3 Park Crescent Management Ltd | Households | 2023 |
| 3 Technology Limited | Information & communication | 2013 |
| 3 Under Properties Limited | Real estate | 2016 |
| 3 W Equity Ltd | Financial services | 2018 |
| 3-PLY Limited | Hospitality | 2020 |
| 30 Degrees Cutz Ltd | Other services | 2024 |
| 30 Park Place Limited | Hospitality | 2018 |
| 300 North Consulting Ltd | Administrative & support | 2015 |
| 301 Ltd | Wholesale & retail | 2008 |
| 302 Ltd | Real estate | 2023 |
| 31 Robert Street (Management) Limited | Households | 2025 |
| 310 Machine Repair Ltd | Manufacturing | 2013 |
| 311 Motoring Ltd | Transport & logistics | 2015 |
| 313DK Ltd | Information & communication | 2019 |
| 321 Move Limited | Professional & scientific | 2019 |
| 32M Limited | Real estate | 2025 |
| 33 Withy Grove RTM Company Ltd | Households | 2021 |
| 333LOV Limited | Extraterritorial | 2024 |
| 34 Harold Terrace Property Limited | Households | 2024 |
| 34 North Park Avenue Management Company Ltd | Households | 2018 |
| 34-36 Canal Road Ltd | Construction | 2016 |
| 342 Films Ltd | Information & communication | 2026 |
| 345 Civil Engineering Ltd | Construction | 2026 |
| 35 ESP Ltd | Professional & scientific | 2022 |
| 36 Consultancy Ltd | Administrative & support | 2021 |
| 360 Logistics Ltd | Transport & logistics | 2024 |
| 360 Marketing Team Ltd | Administrative & support | 2021 |
| 360 Rayel Events Ltd | Administrative & support | 2025 |
| 360 Sales Group Limited | Financial services | 2023 |
| 360 Sales Partners Limited | Administrative & support | 2023 |
| 360 Tech Consultancy Ltd | Information & communication | 2022 |
| 360 Total Clean Ltd | Administrative & support | 2025 |
| 360FIRST Limited | Extraterritorial | 2012 |
| 360HC Ltd | Professional & scientific | 2009 |
| 361 Global Ltd | Administrative & support | 2024 |
| 361 WE Limited | Real estate | 2012 |
| 365 Event Caterers Ltd | Hospitality | 2026 |
| 365 Facilities Management Ltd | Administrative & support | 2019 |
| 365 Total Security Limited | Administrative & support | 2014 |
| 365WORK Limited | Administrative & support | 2018 |
| 37 Hanover Square Management Company Limited | Real estate | 2008 |
| 37 Thackeray Ltd | Real estate | 2022 |
| 38 Embleton Road Flats Management Company Limited | Real estate | 2007 |
| 381A Idrissi Limited | Professional & scientific | 2011 |
| 384 Plant Ltd | Manufacturing | 2025 |
| 39F Limited | Wholesale & retail | 2023 |
| 3A Electrical Services Ltd | Construction | 2023 |
| 3BP Ltd | Real estate | 2019 |
| 3C Venture Capital Ltd | Professional & scientific | 2021 |
| 3CVC LLP | | 2023 |
| 3D Design and Detail Limited | Professional & scientific | 2001 |
| 3D Fire Printing Ltd | Manufacturing | 2024 |
| 3D Food Robotics Ltd | Manufacturing | 2021 |
| 3D Hair Design Limited | Other services | 2003 |
| 3D Plus Ltd | Wholesale & retail | 2017 |
| 3D Productions Ltd | Administrative & support | 2000 |
| 3D.DM Ltd | Construction | 2020 |
| 3DEOLOGY Ltd | Professional & scientific | 2023 |
| 3DM Leisure Limited | Hospitality | 2013 |
| 3DTOYSHOP CIC | Manufacturing | 2021 |
| 3EU Ltd | Real estate | 2026 |
| 3G Joinery and Shopfitting Limited | Manufacturing | 2003 |
| 3G Woodworking Limited | Construction | 2017 |
| 3H Medical Services Limited | Health & social care | 2019 |
| 3LEVATE Developments Ltd | Construction | 2025 |
| 3LINECARRENTALS Ltd | Administrative & support | 2025 |
| 3M Law Limited | Professional & scientific | 2019 |
| 3M Propert Limited | Real estate | 2022 |
| 3MMM Accountancy Services Ltd | Professional & scientific | 2015 |
| 3OU Holdings Limited | Financial services | 2022 |
| 3PJ Associates Ltd | Hospitality | 2019 |
| 3PT Consultants Ltd | Wholesale & retail | 2021 |
| 3SIXTY Property Limited | Real estate | 2015 |
| 3ST Buildings Limited | Real estate | 2020 |
| 3ST Property Ltd | Real estate | 2015 |
| 3T Agencies Ltd | Other services | 2012 |
| 3T'S Consulting Ltd | Professional & scientific | 2025 |
| 3WARE Limited | Information & communication | 2014 |
| 3WAVEMUSIC Limited | Information & communication | 2020 |
| 4 ALL Electrical Ltd | Construction | 2025 |
| 4 Curwen Road Freehold Limited | Households | 2013 |
| 4 I T Recruitment Limited | Information & communication | 1998 |
| 4 Park Village West Limited | Real estate | 2024 |
| 4 Site Security Services Limited | Administrative & support | 2002 |
| 4 Site Security Systems Ltd | Administrative & support | 2018 |
| 4 Slice Ltd | Hospitality | 2019 |
| 4 Splice Ltd | Information & communication | 2022 |
| 4 Westfield Terrace Management Co Limited | Real estate | 2015 |
| 4 Wheels Motor Ltd | Wholesale & retail | 2022 |
| 4 Windsor Terrace Management Company Limited | Households | 1991 |
| 4&7 Motors Ltd | Wholesale & retail | 2025 |
| 4-9-0 Ltd | Information & communication | 2003 |
| 4-INSTANCE Ltd | Information & communication | 2001 |
| 41 the Headrow Limited | Health & social care | 2003 |
| 418LEEDS Ltd | Hospitality | 2026 |
| 42 Leeds Ltd | Hospitality | 2024 |