| JP Nails Academy Ltd | Other services | 2026 |
| JP-1 Yggdrasil Limited | Real estate | 2022 |
| JRA Tackle Holdings Limited | Professional & scientific | 2021 |
| JRH Marketing Limited | Administrative & support | 2026 |
| JSH Trading Company Ltd | Administrative & support | 2025 |
| JSR Vehicle Solutions Ltd | Wholesale & retail | 2024 |
| JSS Financial Consulting Ltd | Wholesale & retail | 2023 |
| JT Neptune Co., Ltd | Manufacturing | 2025 |
| JTN Healthcare Ltd | Health & social care | 2022 |
| Juez Ponce Management Ltd | Extraterritorial | 2023 |
| Juice Infrastructure Advisory Ltd | Professional & scientific | 2018 |
| Juice Infrastructure Investments Limited | Financial services | 2022 |
| Julie Sommerville Art Ltd | Arts & recreation | 2022 |
| Julie-Ann Dean Limited | Information & communication | 2014 |
| Julien Servant Services Ltd | Administrative & support | 2025 |
| Juncheng Asia Pactific Co., Limited | Manufacturing | 2024 |
| Justar International Group Limited | Extraterritorial | 2018 |
| Jwwim Limited | Professional & scientific | 2016 |
| JYZ Trade Ltd | Wholesale & retail | 2026 |
| K Farrell Properties Ltd | Real estate | 2021 |
| K Sanders Consulting Limited | Professional & scientific | 2017 |
| K T Property Holdings Ltd | Real estate | 2025 |
| K&K Investments (Birmingham) Limited | Real estate | 2016 |
| K&M Property Investors Ltd | Real estate | 2020 |
| Kafisma Ltd | Manufacturing | 2025 |
| Kaige Trading Co., Ltd | Extraterritorial | 2023 |
| Kaisam Limited | Professional & scientific | 2021 |
| Kaisen Metal Products Co., Ltd | Administrative & support | 2023 |
| Kami Crypto Ltd | Information & communication | 2021 |
| Kangle Trading Co., Ltd | Administrative & support | 2026 |
| Karen Blake Studios Ltd | Professional & scientific | 2007 |
| Karen Watkins Personal Travel Consultancy Ltd | Administrative & support | 2023 |
| Kary Trading Co., Ltd | Extraterritorial | 2024 |
| Kaya Engineering Co., Limited | Administrative & support | 2025 |
| KCJ Home & Garden Services Limited | Administrative & support | 2018 |
| KD 93 Consulting Ltd | Information & communication | 2017 |
| Keene Solutions Limited | Information & communication | 2013 |
| Kehong Import&Export Co., Ltd | Administrative & support | 2021 |
| Kelk Metal Industry Ltd | Wholesale & retail | 2016 |
| Kelly Cooper Hair Limited | Other services | 2015 |
| Kelly Property Management Ltd | Real estate | 2021 |
| Kenilworth Accountancy Limited | Professional & scientific | 2008 |
| Kenilworth Bathrooms Ltd | Professional & scientific | 2022 |
| Kenilworth Beauty Boutique Ltd | Other services | 2014 |
| Kenilworth Books Limited | Wholesale & retail | 2011 |
| Kenilworth Cantonese Trading Ltd | Hospitality | 2024 |
| Kenilworth Car Hire Limited | Administrative & support | 2021 |
| Kenilworth Carpet Cleaning Ltd | Administrative & support | 2022 |
| Kenilworth Chiropractic Clinic Ltd | Health & social care | 2010 |
| Kenilworth Community Care | Health & social care | 2004 |
| Kenilworth Cuisine Limited | Hospitality | 2023 |
| Kenilworth Design and Build Ltd | Construction | 2016 |
| Kenilworth Digital Services Limited | Professional & scientific | 2026 |
| Kenilworth Domiciliary Care Limited | Public administration | 2022 |
| Kenilworth Event Services Limited | Information & communication | 2024 |
| Kenilworth Fencing Limited | Extraterritorial | 2015 |
| Kenilworth Festival Ltd | Arts & recreation | 2010 |
| Kenilworth Finance Limited | Financial services | 2001 |
| Kenilworth Lions Limited | Households | 2008 |
| Kenilworth Multi Academy Trust | Education | 2011 |
| Kenilworth Pest Control Limited | Agriculture & fishing | 2010 |
| Kenilworth Picture Framing Ltd | Wholesale & retail | 2021 |
| Kenilworth Programme Solutions Ltd | Professional & scientific | 2025 |
| Kenilworth Property Services KPS Ltd | Construction | 2020 |
| Kenilworth Scientific Ltd | Professional & scientific | 2019 |
| Kenilworth Spice Ltd | Hospitality | 2024 |
| Kenilworth Sporting Ltd | Hospitality | 2025 |
| Kenilworth Storage Containers Ltd | Administrative & support | 2021 |
| Kenilworth Trading Limited | Professional & scientific | 1999 |
| Kenilworth Upholstery Limited | Other services | 2017 |
| Kenilworth Vets Ltd | Professional & scientific | 2024 |
| Kenilworth Web Design Ltd | Information & communication | 2012 |
| Kenilworth Wellness & Aesthetics Ltd | Health & social care | 2026 |
| Kenji Management Ltd | Wholesale & retail | 2016 |
| Kensan AI Ltd | Information & communication | 2025 |
| Kerry Business Systems Limited | Information & communication | 2008 |
| Keunen Management Ltd | Extraterritorial | 2025 |
| Keygree Group Co., Ltd | Administrative & support | 2012 |
| Keytrue (UK) Limited | Wholesale & retail | 2022 |
| Kfth Ltd | Professional & scientific | 2018 |
| Khaek Limited | Other services | 2025 |
| Kimaku Consulting Ltd | Information & communication | 2024 |
| Kindred CSR Ltd | Professional & scientific | 2020 |
| Kingsbury Antiques Limited | Wholesale & retail | 2016 |
| Kinky Dating App Ltd | Extraterritorial | 2018 |
| Kinshine Beehive Co., Ltd | Manufacturing | 2019 |
| Kiso LLP | | 2013 |
| Kiss Design Limited | Arts & recreation | 2013 |
| Kitchen Developments Ltd | Professional & scientific | 2018 |
| Kitchen Garden Organics Ltd | Wholesale & retail | 2006 |
| KKD Facilities Management Services Limited | Administrative & support | 2025 |
| Klaassen Motorsport Ltd | Arts & recreation | 2019 |
| KM Midlands Ltd | Wholesale & retail | 2014 |
| KN Smoke Tech Ltd | Other services | 2026 |
| Knibbs Management Ltd | Hospitality | 2023 |
| Knobhill Engineering Limited | Professional & scientific | 2004 |
| Know-How School of Motoring Ltd | Education | 2024 |
| Knowle Park Estates Limited | Administrative & support | 1993 |
| Kobell Fluid Technology Limited | Water & waste | 2007 |
| Kokoso Skin Limited | Other services | 2013 |