| JPR Construction Services Ltd | Water & waste | 2021 |
| JPS Land and Property Ltd | Real estate | 2024 |
| JR Byron Limited | Financial services | 2026 |
| JR Locum Ltd | Health & social care | 2021 |
| JR Moves IT Ltd | Transport & logistics | 2023 |
| Jrmc Property Company Limited | Real estate | 2009 |
| JRS Resources Limited | Wholesale & retail | 2024 |
| JRS Systems Limited | Manufacturing | 2022 |
| JRW Aerobatics Limited | Arts & recreation | 2012 |
| JSB Consultancy Ltd | Professional & scientific | 2022 |
| JSB Project Services Limited | Information & communication | 2022 |
| Jsdg Ltd | Real estate | 2024 |
| Jsjssj Ltd | Extraterritorial | 2022 |
| JSK IT Consulting Ltd | Information & communication | 2014 |
| Jsouthgolf Limited | Arts & recreation | 2024 |
| JSP & HKP Ltd | Real estate | 2023 |
| JSP Flooring Ltd | Construction | 2026 |
| JSR Dental Limited | Health & social care | 2023 |
| Jsrc Automotive Ltd | Wholesale & retail | 2025 |
| Jsrsd Investments Ltd | Real estate | 2021 |
| JST Contracts Ltd | Other services | 2012 |
| Jsvx Consulting & Coaching Ltd | Professional & scientific | 2013 |
| JSY Financial Planning Limited | Financial services | 2023 |
| JT Building and Roofing Ltd | Construction | 2017 |
| JT Cars Ltd | Wholesale & retail | 2025 |
| JT Ethos Limited | Administrative & support | 2005 |
| JTA Engineering Services Ltd | Wholesale & retail | 2021 |
| JTM Building Consultancy Limited | Professional & scientific | 2018 |
| JTM Consultancy Ltd | Real estate | 2021 |
| Jtny Limited | Health & social care | 2021 |
| JTO Foods Limited | Hospitality | 2025 |
| JTR Enterprises Limited | Professional & scientific | 2022 |
| Jubilee Citizens Enterprises C.I.C | Health & social care | 2002 |
| Jubilee Citizens UK | Health & social care | 2002 |
| Judley Properties Limited | Real estate | 2025 |
| Juice House HG Limited | Hospitality | 2026 |
| Juicy Pixels Ltd | Information & communication | 2014 |
| Juja Homes Ltd | Real estate | 2025 |
| Jules Trading Limited | Wholesale & retail | 2023 |
| Julia Transport Ltd | Transport & logistics | 2009 |
| Juliou Maurice Consultancy Ltd | Professional & scientific | 2024 |
| Junction 9 Commercials Limited | Wholesale & retail | 2017 |
| Junction Road Developments Ltd | Construction | 2022 |
| Junior Distribution Ltd | Wholesale & retail | 2023 |
| Junos Entertainment Ltd | Arts & recreation | 2022 |
| Just Applications Limited | Information & communication | 2006 |
| Just for Starters Day Nursery Limited | Other services | 1993 |
| JUST4WARD Fitness Ltd | Arts & recreation | 2013 |
| Justice Medical Ltd | Health & social care | 2026 |
| Juxtaposition Architecture Birmingham Structural Limited | Professional & scientific | 2023 |
| JVR Property Investment Ltd | Real estate | 2026 |
| JWG Newsome Limited | Professional & scientific | 2024 |
| JY Wealth Limited | Other services | 2020 |
| Jyyc Ltd | Wholesale & retail | 2025 |
| K & D Marketing Ltd | Professional & scientific | 2019 |
| K & D Residential Ltd | Real estate | 2025 |
| K & K Carparts Ltd | Wholesale & retail | 2026 |
| K & S3 Ltd | Wholesale & retail | 2025 |
| K B Mcdonagh Ltd | Real estate | 2026 |
| K C Optical Limited | Other services | 2007 |
| K Fleet Services Limited | Manufacturing | 2018 |
| K J Auto Repairs Limited | Wholesale & retail | 2024 |
| K K S Optom Limited | Health & social care | 2006 |
| K Khera Properties Ltd | Real estate | 2020 |
| K Kulkarni Limited | Health & social care | 2012 |
| K P Dental Limited | Health & social care | 2021 |
| K R G Housing Ltd | Hospitality | 2013 |
| K S W Takeaway Ltd | Hospitality | 2014 |
| K Tech IT Solutions Limited | Information & communication | 2024 |
| K&G Catering Limited | Hospitality | 2021 |
| K&R Projects Group Limited | Hospitality | 2019 |
| K&S Future Developments Ltd | Hospitality | 2017 |
| K. D. Commercial Ltd | Real estate | 2026 |
| K. D. Midlands Ltd | Financial services | 2026 |
| K.& V.Cooke Limited | Real estate | 1953 |
| K.B.P. Ninety Three Limited | Real estate | 1994 |
| K.R.D. Consulting Limited | Professional & scientific | 2019 |
| K.Smith Property Services Limited | Real estate | 2020 |
| K.Y. Green Limited | Extraterritorial | 2012 |
| K2D Ltd | Manufacturing | 2025 |
| K3N CAN Solutions Limited | Information & communication | 2016 |
| K9 Dogs Ltd | Other services | 2023 |
| K9S Training Ltd | Education | 2022 |
| KA POW Fast Food Ltd | Hospitality | 2013 |
| Kaaj Trading Ltd | Wholesale & retail | 2018 |
| Kababish Restaurants Limited | Hospitality | 2004 |
| Kabir Medical and Educational Services Ltd | Health & social care | 2025 |
| Kabko Limited | Manufacturing | 2014 |
| Kableford Limited | Professional & scientific | 2022 |
| Kahawa Roots (UK) Ltd | Wholesale & retail | 2025 |
| Kaila Transport Ltd | Administrative & support | 2020 |
| Kailash Investments Ltd | Real estate | 2013 |
| Kaiyuvraj Ltd | Administrative & support | 2026 |
| Kaleido Projects Ltd | Professional & scientific | 2018 |
| Kaleview Limited | Hospitality | 2026 |
| Kalkaz Ltd | Health & social care | 2021 |
| Kallar Family Investments Limited | Real estate | 2016 |
| Kallisthea Ltd | Health & social care | 2025 |
| Kalon Restaurants Ltd | Hospitality | 2025 |
| Kalsi Bathroom & Tiles Ltd | Construction | 2026 |