| KGB Limited | Transport & logistics | 2009 |
| Kgpd Ltd | Hospitality | 2025 |
| KH Care & Support Services Ltd | Health & social care | 2026 |
| Kibet KO Kitchen Ltd | Hospitality | 2026 |
| Kibet KO Ltd | Real estate | 2024 |
| Kicky Ltd | Wholesale & retail | 2020 |
| Kidtopia Ltd | Hospitality | 2025 |
| Kiersol Health and Wellbeing Ltd | Health & social care | 2025 |
| Kiff Photography Ltd | Professional & scientific | 2015 |
| Kiln Transport Limited | Transport & logistics | 2023 |
| Kimmeridge Limited | Agriculture & fishing | 1997 |
| Kimmy's Autos Limited | Wholesale & retail | 2023 |
| King's Lynn KOI & Aquatics Limited | Wholesale & retail | 2020 |
| King's Lynn Warehousing (Holdings) Ltd | Financial services | 2020 |
| Kings Lynn Industrial Cleaning Limited | Administrative & support | 2024 |
| Kings Lynn Storage Ltd | Other services | 2025 |
| Kings Portal Ltd | Other services | 2022 |
| Kirk Coachworks Ltd | Wholesale & retail | 2003 |
| Kirkliauskas Darbai Ltd | Administrative & support | 2025 |
| Kitran Consulting Ltd | Professional & scientific | 2015 |
| KJ & CJ Properties Limited | Real estate | 2017 |
| KJ Plastering - East Anglia Limited | Construction | 2021 |
| KJL Property Management Limited | Real estate | 2019 |
| KL China and Glass Ware Hire Limited | Hospitality | 2024 |
| KL Project Consultancy Limited | Professional & scientific | 2024 |
| Klich Limited | Transport & logistics | 2015 |
| Kloe Developments Ltd | Construction | 2026 |
| KLS Maintenance Ltd | Construction | 2021 |
| KMR Barbers Ltd | Other services | 2019 |
| Knights Court Management (TSJ) Ltd | Households | 2024 |
| Kodi Services Ltd | Construction | 2016 |
| KR World UK Limited | Wholesale & retail | 2023 |
| Krakow Corner Shop Limited | Wholesale & retail | 2019 |
| Krazy Dayz Nursery Limited | Education | 2013 |
| KRK Holdings Limited | Real estate | 2025 |
| KRS Securities Ltd | Real estate | 2025 |
| Krylo Limited | Information & communication | 2016 |
| Krystal Clean and Care Ltd | Agriculture & fishing | 2015 |
| KS Auto Salvage Ltd | Wholesale & retail | 2017 |
| KSL Trade Ltd | Wholesale & retail | 2023 |
| KTA Construction Ltd | Construction | 2026 |
| KTA Services Ltd | Construction | 2025 |
| KTR Estates Limited | Real estate | 2024 |
| Kuretake ZIG (UK) Limited | Wholesale & retail | 2025 |
| Kvpb Ltd | Wholesale & retail | 2018 |
| Kwik Signs EST 94 Ltd | Manufacturing | 2015 |
| L & H Transport Services Ltd | Transport & logistics | 2025 |
| L B Landscapes Limited | Administrative & support | 2019 |
| L G Coleman Farming Limited | Agriculture & fishing | 2015 |
| L G Flooring (Wisbech) Ltd | Construction | 2019 |
| L Smith and Sons Limited | Construction | 2020 |
| L&J Catering Ltd | Hospitality | 2021 |
| L&P Couriers Ltd | Transport & logistics | 2019 |
| L&V Transport Ltd | Transport & logistics | 2025 |
| L.B.C Construction & Rail Limited | Construction | 2015 |
| L.G. Commercials Limited | Wholesale & retail | 1997 |
| L.T. Traffic Ltd | Construction | 2025 |
| L8 Protection Group Limited | Financial services | 2025 |
| L8 Protection.Com Limited | Professional & scientific | 2014 |
| L8 Treatment Limited | Professional & scientific | 2026 |
| LA Barbers Ltd | Other services | 2024 |
| LA Garden & Cleaning Services Limited | Administrative & support | 2025 |
| LA Greek Food Ltd | Hospitality | 2023 |
| LA Wabe Flooring Limited | Construction | 2013 |
| Ladysafe and Sons Ltd | Transport & logistics | 2013 |
| Lakesend Ltd | Professional & scientific | 2014 |
| Lakeside Multilets Ltd | Hospitality | 2025 |
| Lamoyo Ltd | Wholesale & retail | 2024 |
| Lannic Limited | Professional & scientific | 2011 |
| Lasa Management Limited | Construction | 2015 |
| Lashboxla-Uk Limited | Other services | 2019 |
| Last Legion Limited | Information & communication | 2002 |
| Latcham Dowling Ltd | Real estate | 2020 |
| Laurel IT Services Limited | Information & communication | 2024 |
| LAV Care Services Ltd | Health & social care | 2018 |
| Laysry Ltd | Construction | 2026 |
| Layton DRY Cleaners (Spalding) Limited | Other services | 2015 |
| Laytons DRY Cleaners (UK) Ltd | Other services | 2010 |
| Laytons DRY Cleaners Ltd | Other services | 2008 |
| LDW Developers Limited | Construction | 2017 |
| Leada Cambs CIC | Arts & recreation | 2018 |
| Leaderman Electrical Accessories Limited | Wholesale & retail | 2017 |
| Leam Produce Ltd | Wholesale & retail | 2018 |
| Leema Retail Limited | Wholesale & retail | 2023 |
| Legal Number Plates UK Ltd | Wholesale & retail | 2025 |
| Lemia Holding Company Ltd | Financial services | 2022 |
| LEO88 Ltd | Professional & scientific | 2026 |
| Leodon Ltd. | Wholesale & retail | 2018 |
| Lewis Digital Media Ltd | Information & communication | 2015 |
| Leziz Food Ltd | Hospitality | 2015 |
| LFG Consulting Limited | Administrative & support | 2016 |
| LH Driving Services Limited | Transport & logistics | 2014 |
| LH Media Consultants Limited | Professional & scientific | 2025 |
| LHL Projects Ltd | Construction | 2023 |
| Lhsp Estates Limited | Real estate | 2019 |
| Liam's Gold Ltd | Financial services | 2026 |
| Lift and Shift Limited | Administrative & support | 2001 |
| Lightning Network Solutions Ltd | Information & communication | 2023 |
| Lilac HR Ltd | Professional & scientific | 2018 |
| Lilacs Projects Limited | Professional & scientific | 2014 |