| JVB Plus Ltd | Transport & logistics | 2025 |
| Jvvi Properties Limited | Real estate | 2024 |
| JW Assistant Limited | Information & communication | 2022 |
| JW Counselling Services Ltd | Health & social care | 2022 |
| JW Isla Limited | Hospitality | 2025 |
| JWG Survey & Engineering Limited | Professional & scientific | 2015 |
| JWL Sports Therapy Limited | Health & social care | 2025 |
| Jwoods Electrical Ltd | Construction | 2021 |
| JWR Financial Solutions Limited | Financial services | 2026 |
| JY Interests Limited | Professional & scientific | 2023 |
| Jylp Ltd | Real estate | 2026 |
| JZP Property Holdings Limited | Real estate | 2016 |
| JZR Group Ltd | Information & communication | 2025 |
| K & a Builders Limited | Construction | 2001 |
| K & B Szabo Ltd | Transport & logistics | 2019 |
| K & E Shipping Management Ltd | Transport & logistics | 2017 |
| K & H Handling Limited | Transport & logistics | 2009 |
| K & S Grimwood Ltd | Real estate | 2020 |
| K & S Handballing Limited | Transport & logistics | 2020 |
| K C the Barbershop Ltd | Other services | 2020 |
| K Consultancy Ltd | Information & communication | 2024 |
| K Edwards Carpentry Limited | Construction | 2026 |
| K F F E Trading Limited | Hospitality | 1996 |
| K G Technical Services (East Anglia) Ltd | Energy | 2016 |
| K I a Enterprises Ltd | Arts & recreation | 2022 |
| K J Thorpe Limited | Construction | 2010 |
| K Lever GAS and OIL Heating Services Ltd | Construction | 2014 |
| K R Power Solutions Limited | Professional & scientific | 2014 |
| K Stallion Limited | Arts & recreation | 2021 |
| K Strong Limited | Construction | 2025 |
| K Z Cars Ltd | Wholesale & retail | 2022 |
| K&F Brothers Ltd | Construction | 2016 |
| K&M Restaurant Group Limited | Hospitality | 2023 |
| K&R Fastfoods Ltd | Hospitality | 2024 |
| K. Foley Limited | Hospitality | 2000 |
| K.G Recovery Ltd | Transport & logistics | 2023 |
| K.Moulton Ltd | Information & communication | 2023 |
| K.P.S Plumbing and Heating Contracts Limited | Construction | 2010 |
| K3YS Limited | Arts & recreation | 2021 |
| K4 Tech UK Ltd | Manufacturing | 2023 |
| K9COOL Ltd | Manufacturing | 2025 |
| KA 2022 Limited | Transport & logistics | 2022 |
| Kader Investments Limited | Other services | 2020 |
| Kadisha Lewis Roberts Ltd | Professional & scientific | 2020 |
| Kajenny Healthcare Ltd | Health & social care | 2025 |
| KAL Tchur Ltd | Wholesale & retail | 2025 |
| Kal-El Estates Ltd | Real estate | 2026 |
| Kalani Mikala Limited | Extraterritorial | 2024 |
| Kallmi Ltd | Construction | 2021 |
| Kalos Tropos Consults Ltd | Administrative & support | 2022 |
| Kalp Traders Ltd | Wholesale & retail | 2018 |
| KAM BE Inspired Limited | Other services | 2020 |
| Kamz Kocktails Limited | Wholesale & retail | 2021 |
| Kamzco Ltd | Wholesale & retail | 2024 |
| KAN Accommodation Ltd | Hospitality | 2025 |
| KAN Holdings (Suffolk) Ltd | Financial services | 2025 |
| KAN Sorrel Ltd | Hospitality | 2025 |
| Kanduu Management Limited | Professional & scientific | 2021 |
| Kanima Ltd | Real estate | 2021 |
| Karen Brown Consultancy Limited | Professional & scientific | 2019 |
| Karen Louise Dance CIC | Arts & recreation | 2022 |
| Karen Pickering Swim Limited | Arts & recreation | 2006 |
| Karhu Consulting Limited | Information & communication | 2022 |
| Karlu Limited | Wholesale & retail | 2002 |
| Karly's Swim Stars Ltd | Education | 2024 |
| Karma Electrical & Fire Systems Ltd | Construction | 2014 |
| Karmartri Ltd | Other services | 2020 |
| Karmenco Driving Solutions Ltd | Transport & logistics | 2025 |
| Karmenco Limited | Professional & scientific | 2018 |
| Karmenco Logistics & Recruitment Ltd | Transport & logistics | 2024 |
| Karol Buczek Transport Ltd | Water & waste | 2018 |
| Karpat Ltd | Wholesale & retail | 2024 |
| Karpatick Ltd | Wholesale & retail | 2020 |
| Kartarbadshah Ltd | Hospitality | 2023 |
| Kartvart Limited | Information & communication | 2023 |
| Karukinattil Ltd | Health & social care | 2015 |
| Karzees Limited | Administrative & support | 2002 |
| KAS Cards & Collectables Ltd | Wholesale & retail | 2025 |
| Kase-Tec Solutions Limited | Information & communication | 2023 |
| Kasper Design Ltd | Information & communication | 2024 |
| Kass Property Co. Ltd | Real estate | 2007 |
| Katie Kershaw Ltd | Professional & scientific | 2020 |
| Katie Mellor & Associates Ltd | Administrative & support | 2018 |
| Katie Mellor Consulting Ltd | Professional & scientific | 2025 |
| Katie Mellor Holdings Ltd | Financial services | 2025 |
| Katzian Ltd | Transport & logistics | 2026 |
| Kaur Case Management Ltd | Health & social care | 2022 |
| Kavali Ltd | Other services | 2024 |
| KAY of the Gentle Touch Limited | Other services | 1999 |
| Kay-Em Ltd | Hospitality | 2025 |
| Kaydi Limited | Real estate | 2025 |
| Kayhan Property Limited | Real estate | 2018 |
| Kaymat Limited | Professional & scientific | 2021 |
| Kazpero Ltd | Information & communication | 2025 |
| KB Kebabs Ltd | Hospitality | 2019 |
| KB Stratton Motors Ltd | Wholesale & retail | 2021 |
| KBB (East Anglia) Limited | Manufacturing | 2005 |
| KBH Holdings Ltd. | Professional & scientific | 2017 |
| KBL Brothers Ltd | Wholesale & retail | 2023 |
| KC Cleaning (EA) Limited | Administrative & support | 2019 |