| KEK Consultancy Ltd | Professional & scientific | 2023 |
| Kellies Kosmetics Ltd | Other services | 2021 |
| Kennedy's Product Ltd | Wholesale & retail | 2022 |
| Kenoch Property Investment Ltd | Real estate | 2025 |
| Kenta Prime Ltd | Wholesale & retail | 2023 |
| Kenzie Grace Ltd | Wholesale & retail | 2019 |
| Kepus Group Ltd | Administrative & support | 2023 |
| Kerith Community Church | Other services | 2008 |
| Kerners Limited | Wholesale & retail | 2000 |
| Key Properties Limited | Real estate | 1968 |
| Keylogic Software Ltd | Information & communication | 2024 |
| Keymates Property Group Ltd | Real estate | 2026 |
| KFH Logistics Limited | Transport & logistics | 2013 |
| KFS Cleaning Services Limited | Administrative & support | 2019 |
| Kickstart Soccer Limited | Arts & recreation | 2018 |
| Kiewlen Builders Ltd | Construction | 2022 |
| Kilby Investments Limited | Construction | 2025 |
| Kilpa Co. Ltd | Professional & scientific | 2020 |
| Kilpatrick Training & Consultancy Limited | Education | 2017 |
| KIM Howard Ltd | Real estate | 2017 |
| Kimmy Eshop Ltd | Wholesale & retail | 2025 |
| KIN Dryliner Ltd | Construction | 2022 |
| Kina'Ole Children's Services Ltd | Professional & scientific | 2015 |
| King Carpentry Ltd | Other services | 2023 |
| King Software Solutions Ltd | Information & communication | 2025 |
| Kingcott Accountants Ltd | Professional & scientific | 2002 |
| Kingcott Digital Ltd | Information & communication | 2018 |
| Kingdom Nexus Ltd | Wholesale & retail | 2025 |
| Kings Quarter Limited | Professional & scientific | 2019 |
| Kingsland Construction Group Ltd | Administrative & support | 2018 |
| Kintrax Limited | Information & communication | 2016 |
| Kiqo Limited | Wholesale & retail | 2018 |
| Kiqo Sports Wear Ltd | Wholesale & retail | 2020 |
| Kirklington Property Developments Ltd. | Construction | 2002 |
| Kirollos Properties Ltd | Administrative & support | 2015 |
| Kirstin Oliver Arts Consultancy Ltd | Professional & scientific | 2021 |
| Kirsty & Maxine’S Childrenswear Limited | Wholesale & retail | 2026 |
| Kitchens of Italy Limited | Wholesale & retail | 2000 |
| KJA Building Services Ltd | Construction | 2011 |
| KK Derma Ltd | Health & social care | 2019 |
| Kleidrew Properties Ltd | Real estate | 2026 |
| KLN Tech Ltd | Wholesale & retail | 2025 |
| KM Real Estates Ltd | Real estate | 2020 |
| KM Technologies Ltd | Information & communication | 2015 |
| KMA JIU Jitsu Ltd | Education | 2020 |
| KMR Supporting Service Ltd | Administrative & support | 2024 |
| KNG Hospitality Ltd | Hospitality | 2024 |
| Knight Precision Manufacturing Ltd | Manufacturing | 2026 |
| Knight Sims Ltd | Information & communication | 1998 |
| Knit Machine Parts Ltd | Wholesale & retail | 2024 |
| Know Solutions Limited | Manufacturing | 2007 |
| Knowledge Based Property Limited | Real estate | 2025 |
| Koat Properties Ltd | Real estate | 2019 |
| Koat Real Estate Ltd | Real estate | 2022 |
| KOD4 Financial Services Limited | Professional & scientific | 2019 |
| Kokoro Leicester Ltd | Hospitality | 2026 |
| Komplett Solutions Ltd | Wholesale & retail | 2020 |
| Kong in the Community CIC | Education | 2024 |
| Kong Martial Arts Ltd | Education | 2018 |
| Kornerstone Health Ltd | Wholesale & retail | 2021 |
| Kosta Electrical Plumbing Heating Ltd | Construction | 2025 |
| Kotka Limited | Professional & scientific | 2015 |
| Koubou Interiors Ltd | Professional & scientific | 2020 |
| Kovgroup Ltd | Wholesale & retail | 2019 |
| KP Healthcare Consultants Ltd. | Health & social care | 2014 |
| KPM Timere Spiritu Ltd | Arts & recreation | 2018 |
| KR Production Ltd | Information & communication | 2020 |
| Krav Maga & Martial Arts Berkshire Ltd. | Education | 2022 |
| Krivi Properties Limited | Real estate | 2024 |
| Krolex Ceilings & Partitions Limited | Construction | 2018 |
| Kronos Worldwide Limited | Information & communication | 2012 |
| Krst Limited | Real estate | 2015 |
| KS Muscle Mechanics Balms Ltd | Manufacturing | 2020 |
| KTM Device Protection Services Limited | Financial services | 2025 |
| KTM Online Services Limited | Information & communication | 2022 |
| KTR Tax Ltd | Professional & scientific | 2020 |
| Kudael Limited | Health & social care | 2015 |
| Kukis Drives Ltd | Transport & logistics | 2025 |
| Kuldip Bhatti Notary Public Limited | Professional & scientific | 2020 |
| Kuntech Trading Ltd | Wholesale & retail | 2020 |
| Kunye Energy Limited | Manufacturing | 2022 |
| KV Top Beauty Limited | Wholesale & retail | 2025 |
| Kwalker and Co Ltd | Real estate | 2023 |
| Kykb Ltd | Wholesale & retail | 2022 |
| L a Rendell Ltd | Manufacturing | 2019 |
| L Cleaning Services Ltd | Administrative & support | 2023 |
| L J Hold Ltd | Wholesale & retail | 2023 |
| L&N Accessories Company Limited | Wholesale & retail | 2024 |
| L.Howard Ltd | Construction | 2019 |
| LA Dolce Vita Caffe' Limited | Hospitality | 2021 |
| LA Jaks Barbershop Ltd | Other services | 2017 |
| LA Micro (Brokerage) Limited | Information & communication | 2016 |
| LA Micro Group (UK) Limited | Information & communication | 2004 |
| LA Poubelle Limited | Administrative & support | 2016 |
| LA Sports Physiotherapy Ltd | Health & social care | 2010 |
| Laasya Consultancy Ltd | Information & communication | 2019 |
| LAB Enterprise Limited | Wholesale & retail | 2022 |
| LAB Wise Ltd | Other services | 2023 |
| Laboratory Auctions (BLA) Ltd | Wholesale & retail | 2018 |
| Ladakh Holdings Ltd | Professional & scientific | 2016 |