| Jind Driveway Limited | Information & communication | 2024 |
| JIU Pro Service Limited | Transport & logistics | 2023 |
| JJ Building & Joinery Ltd | Construction | 2015 |
| Jj.K 1ST-TRANSPORT Ltd | Transport & logistics | 2024 |
| Jjkv Properties Limited | Real estate | 2023 |
| Jjm.Ai Ltd | Arts & recreation | 2026 |
| JK Construction Midlands Limited | Construction | 2019 |
| JK Express Ltd | Wholesale & retail | 2025 |
| JK Matharu Roofing Ltd | Construction | 2024 |
| JK Nine Enterprises Ltd | Wholesale & retail | 2026 |
| JK Properties (B'Ham) Ltd | Real estate | 2025 |
| JK Seventeen Racing Limited | Arts & recreation | 2023 |
| JKB U.K. Ltd | Transport & logistics | 2025 |
| JKS Mgmt Ltd | Professional & scientific | 2022 |
| JM Consumption Ltd | Wholesale & retail | 2022 |
| JMD Courier Ltd | Transport & logistics | 2024 |
| Joel Truck'Ing Ltd | Transport & logistics | 2019 |
| Johal Logistics Ltd Ltd | Transport & logistics | 2025 |
| John Logistics Limited | Transport & logistics | 2015 |
| Johnson Analytica Limited | Manufacturing | 2000 |
| JON P Grant Ltd | Professional & scientific | 2023 |
| Jonas & Henry LLP | | 2014 |
| Jordan WIN Ltd | Hospitality | 2024 |
| JOT Sran Trading Ltd | Transport & logistics | 2025 |
| JOT Transport U.K. Ltd | Transport & logistics | 2024 |
| Journey Training Ltd | Education | 2025 |
| JRV Property Management Limited | Real estate | 2025 |
| JS Clearance Ltd | Wholesale & retail | 2025 |
| JS Foods U.K. Ltd | Hospitality | 2024 |
| JS Logistics U.K. Ltd | Transport & logistics | 2025 |
| JS Transport U.K. Ltd | Transport & logistics | 2025 |
| JS Valtoha Properties Ltd | Real estate | 2025 |
| JSB PIX Ltd | Professional & scientific | 2024 |
| JSB Plumbing & Heating Services Ltd | Construction | 2025 |
| JSD Builders Ltd | Construction | 2019 |
| JSD GAS Services Limited | Construction | 2018 |
| JSG Courier Ltd | Transport & logistics | 2022 |
| JSG Private Limited | Hospitality | 2025 |
| JSG Technology Ltd | Professional & scientific | 2026 |
| Jsgg Homes Ltd | Real estate | 2023 |
| JSJ Building Contractors Ltd | Construction | 2020 |
| JSN Physio Ltd | Health & social care | 2024 |
| Jspec Analytical Ltd | Manufacturing | 2024 |
| JST Courier Ltd | Transport & logistics | 2026 |
| JST Supplies Ltd | Wholesale & retail | 2023 |
| JT Trans Speed Ltd | Transport & logistics | 2021 |
| Judith ARK of Hope Limited | Health & social care | 2024 |
| Junc 2 Van Sales Ltd | Wholesale & retail | 2017 |
| Junior AI Limited | Information & communication | 2025 |
| JUNIORANDRE2025 Ltd | Health & social care | 2025 |
| Just 1 Vehicle Solutions Limited | Wholesale & retail | 2021 |
| JV Site Services Ltd | Construction | 2019 |
| JY Torres Ltd | Health & social care | 2023 |
| K 5 Barberr Ltd | Other services | 2024 |
| K a Parchment Ltd | Water & waste | 2019 |
| K B Shopfront Ltd | Construction | 2010 |
| K Hamid Limited | Households | 2024 |
| K K R K Electrical Services Ltd | Manufacturing | 2021 |
| K R L Properties Limited | Financial services | 2016 |
| K U Business Solutions Ltd | Professional & scientific | 2019 |
| K W.R Maskell Ltd | Real estate | 2026 |
| K&G Transport Ltd | Transport & logistics | 2024 |
| K&K Building Ltd | Construction | 2021 |
| K&K HGV Limited | Transport & logistics | 2015 |
| K&Q Logistics Limited | Transport & logistics | 2022 |
| K. S. B. Beer & Bar Supplies Limited | Hospitality | 2016 |
| K.R. & GS Ltd. | Wholesale & retail | 2013 |
| K.S. Heating & Plumbing Limited | Other services | 2019 |
| K2S Properties Ltd | Real estate | 2026 |
| K9 Vets Limited | Professional & scientific | 1987 |
| Kaara Household Ltd | Wholesale & retail | 2022 |
| Kaashni Construction Limited | Construction | 2025 |
| Kaler Renovation Ltd | Construction | 2025 |
| Kalsi Consultancy Limited | Professional & scientific | 2018 |
| Kalsi Roofing Ltd | Construction | 2026 |
| KAM Khan Ltd | Wholesale & retail | 2023 |
| Kamboj Holdings Limited | Real estate | 2025 |
| Kamc Holdings Ltd | Professional & scientific | 2022 |
| Kamil Sochacki Trans Ltd | Transport & logistics | 2019 |
| Kamilah Rashida FOX Ltd | Public administration | 2026 |
| Kams CUT Ltd | Other services | 2025 |
| Kams Fade Ltd | Other services | 2026 |
| Kandy Broker Ltd | Wholesale & retail | 2017 |
| Kang Developments Ltd | Construction | 2020 |
| Kang UK Construction Ltd | Construction | 2022 |
| Kapadia & Surti Ltd | Wholesale & retail | 2025 |
| Kapasi Legal Ltd | Professional & scientific | 2021 |
| Kargowave Ltd | Transport & logistics | 2025 |
| Karst Organics Limited | Wholesale & retail | 2018 |
| Kartsy Ltd | Wholesale & retail | 2025 |
| KASADA1 Ltd | Wholesale & retail | 2024 |
| Kasia Cleaning Limited | Administrative & support | 2018 |
| Kasia Polskie Delikatesy Limited | Wholesale & retail | 2014 |
| Katolopop Innovation Limited | Wholesale & retail | 2024 |
| Katroshi Limited | Real estate | 2017 |
| KAU53R & Sons Ltd | Real estate | 2025 |
| Kaur H Ltd | Health & social care | 2007 |
| Kaur Legacy Properties Ltd | Real estate | 2025 |
| KAY Assets Management Ltd | Real estate | 2025 |
| Kayaa Holistic Centre Ltd | Health & social care | 2023 |