| JT Estimating Solutions Ltd | Construction | 2025 |
| JTM Estates Limited | Real estate | 2024 |
| Jugld Ltd | Information & communication | 2026 |
| Juicy FIG Ventures Limited | Wholesale & retail | 2026 |
| Jump Fitness Ltd | Other services | 2012 |
| Junayd ALI Ltd | Wholesale & retail | 2024 |
| Juniper Enterprises Holdings Limited | Financial services | 2024 |
| Juniper Estates Property Sourcing Ltd | Real estate | 2023 |
| Jupiter Home Decor Ltd | Wholesale & retail | 2018 |
| Jusbuild (Manchester) Limited | Construction | 2013 |
| Jussin 3 Limited | Wholesale & retail | 2017 |
| Just BEE MCR Ltd | Administrative & support | 2025 |
| Just Foster Holdings Limited | Financial services | 2026 |
| Just Sharing Ltd | Wholesale & retail | 1991 |
| Just Walking Through Life Limited | Professional & scientific | 2025 |
| Justitia Legal Limited | Professional & scientific | 2023 |
| JV Pharma Ltd | Wholesale & retail | 2026 |
| Jveo Limited | Professional & scientific | 2026 |
| JWH Recruitment Ltd | Administrative & support | 2024 |
| JWM Property Management Services Limited | Real estate | 2024 |
| JWR Investment Group Limited | Wholesale & retail | 2026 |
| JZ Social Ltd | Wholesale & retail | 2026 |
| K & C Property (Manchester) Limited | Real estate | 2023 |
| K & K Cutz Ltd | Other services | 2025 |
| K & N Invesments Ltd | Real estate | 2025 |
| K & SJ Housing Ltd | Real estate | 2025 |
| K and F Private Ltd | Real estate | 2021 |
| K Eaton Construction Ltd | Construction | 2019 |
| K J Property Rentals Ltd | Real estate | 2023 |
| K Mccrory Civils Ltd | Professional & scientific | 2019 |
| K Motorsports Ltd | Wholesale & retail | 2012 |
| K T a Properties Limited | Real estate | 2015 |
| K West Connect Ltd | Transport & logistics | 2025 |
| K&B Renovations Ltd | Manufacturing | 2026 |
| K&M Co-Innovation Ltd | Professional & scientific | 2024 |
| K.C. Clays Limited | Manufacturing | 1978 |
| K7 Compliance Ltd | Administrative & support | 2013 |
| Kadhar Associates Ltd | Construction | 2026 |
| Kahraman Construction Maintenance and Repair Services Ltd | Construction | 2020 |
| Kaioko Limited | Information & communication | 2003 |
| Kaizen Bioservices Ltd. | Administrative & support | 2017 |
| Kaizen Fight Gear Ltd | Extraterritorial | 2022 |
| Kaizen Management Consulting Limited | Professional & scientific | 2025 |
| Kaloneu UK Ltd | Manufacturing | 2019 |
| Kanege Komplex Ltd | Real estate | 2023 |
| Kanzen Outcomes Limited | Health & social care | 2023 |
| Kanzenta Ltd | Wholesale & retail | 2024 |
| Kapital IT Ltd | Information & communication | 2019 |
| Karen Mellor Book-Keeping Services Ltd | Professional & scientific | 2025 |
| Karim & Nour Ltd | Health & social care | 2019 |
| Karios Capital Ltd | Wholesale & retail | 2017 |
| Karma Tech Search Limited | Administrative & support | 2020 |
| Karsa 1 Ltd | Hospitality | 2024 |
| Kart Retail Ltd | Wholesale & retail | 2023 |
| Kasm Investment Properties Ltd | Real estate | 2026 |
| Kate FOX Design Ltd | Arts & recreation | 2025 |
| Katie O'Brien Design Limited | Arts & recreation | 2016 |
| Katie White Estate Agents Ltd | Real estate | 2026 |
| Kauk Ltd | Education | 2026 |
| Kaur's Medical Ltd | Wholesale & retail | 2024 |
| Kayo Medical Services Ltd | Health & social care | 2026 |
| KAZ Pharma Ltd | Wholesale & retail | 2023 |
| Kazman Consulting Ltd | Information & communication | 2018 |
| KB Electrics Ltd | Construction | 2007 |
| KBX Associates Limited | Financial services | 2017 |
| KC Prestige Valeting Limited | Wholesale & retail | 2026 |
| Kcmcateringandevents Ltd | Hospitality | 2026 |
| Kdob Services Limited | Professional & scientific | 2014 |
| Keasdon Energy Ltd | Information & communication | 2013 |
| Keelex 246 Limited | Real estate | 1983 |
| Keenan Capital Limited | Other services | 2019 |
| Keep IT Moovin Ltd | Administrative & support | 2025 |
| Keith Checkley & Associates Limited | Professional & scientific | 2001 |
| Keksinergy Ltd | Real estate | 2024 |
| Keni + Mali Global Limited | Financial services | 2020 |
| Keni + Mali Limited | Wholesale & retail | 2020 |
| Kenny Asset Management Limited | Financial services | 2025 |
| Kensington Moor Limited | Other services | 2020 |
| Kentnere Limited | Financial services | 2019 |
| Keogh Lighting Ltd | Arts & recreation | 2013 |
| Kerala's Food Ltd | Hospitality | 2021 |
| Kestrel Accountancy & Tax Limited | Extraterritorial | 2006 |
| Key Safe Automotive Locksmiths Ltd | Wholesale & retail | 2026 |
| Keyan’S Pizza Ltd | Hospitality | 2023 |
| Keyline Financial Solutions Limited | Financial services | 2010 |
| Keyscape Properties Ltd | Real estate | 2024 |
| Keystone Teeth Ltd | Health & social care | 2019 |
| KFM Pharma Consulting Limited | Professional & scientific | 2024 |
| KH Fitness Ltd | Arts & recreation | 2023 |
| Khalil Musa Photography Limited | Professional & scientific | 2023 |
| Khandoker Property Ltd | Real estate | 2025 |
| KHE Marketing Solutions Ltd | Administrative & support | 2023 |
| KHJ Consultancy Ltd | Administrative & support | 2023 |
| KHL Electrical Contractors Ltd | Construction | 2024 |
| KHL Finance Limited | Professional & scientific | 2026 |
| KID Co Investments Limited | Real estate | 2016 |
| KID Co Trading and Developments Limited | Real estate | 2016 |
| Kids Inc Residential Services Ltd | Administrative & support | 2020 |
| Kidzilla Limited | Arts & recreation | 2017 |
| Kidzilla Services Limited | Energy | 2018 |