| Julian Hollingsworth Consulting Ltd | Professional & scientific | 2014 |
| June Engagements Ltd | Wholesale & retail | 2021 |
| Just ADD Print Ltd | Manufacturing | 2010 |
| Just Wills and Legal Services Ltd | Professional & scientific | 2013 |
| JVN Properties Ltd | Real estate | 2017 |
| JW Enviroscapes Limited | Administrative & support | 2000 |
| K & S Estates Limited | Real estate | 2000 |
| K Adams Limited | Professional & scientific | 2020 |
| K ST Barbers Limited | Other services | 2019 |
| K&K Global Investments Ltd | Construction | 2021 |
| K. Black & Sons Limited | Construction | 2003 |
| K4 Hygiene Services Ltd | Administrative & support | 2020 |
| Kalypton Group Limited | Information & communication | 2014 |
| Kalypton Limited | Information & communication | 2001 |
| Kalypton Research Limited | Professional & scientific | 2010 |
| Kalypton Systems Limited | Information & communication | 2008 |
| Kalypton Technologies Limited | Information & communication | 2010 |
| Kaqun UK Ltd | Wholesale & retail | 2017 |
| Karen & ZIA Ltd | Health & social care | 2019 |
| Karo Valeting Services Ltd | Administrative & support | 2026 |
| Kbespoke Ltd | Manufacturing | 2024 |
| KCG Consultants Limited | Mining & quarrying | 1999 |
| KD Trade Sales Ltd | Wholesale & retail | 2023 |
| Kdalabel.Co Limited | Wholesale & retail | 2025 |
| Keeble House Limited | Real estate | 1999 |
| Keech Bickerstaffe Ltd | Wholesale & retail | 2021 |
| Keiraslashes Ltd | Other services | 2025 |
| Keith Farley Ltd | Professional & scientific | 2013 |
| Kenley & Purley Roofing Limited | Construction | 2005 |
| Kenna Retails Limited | Wholesale & retail | 2024 |
| Key Team Managing 4U Limited | Wholesale & retail | 2011 |
| Keybear Developments Ltd | Real estate | 2024 |
| Keybear Homes Ltd | Real estate | 2024 |
| Keyframe Quest Ltd | Professional & scientific | 2021 |
| KI & LI Ltd | Wholesale & retail | 2020 |
| Kicks Dance Limited | Arts & recreation | 2018 |
| Kidzlinx Limited | Information & communication | 2015 |
| Kilted Cocktails Ltd | Hospitality | 2023 |
| Kingscote Media Services Ltd | Information & communication | 2021 |
| Kingswood Law Group Limited | Administrative & support | 2002 |
| Kingswood Law Holdings Ltd | Administrative & support | 2008 |
| Kingswood Law IFA Limited | Administrative & support | 2006 |
| Kitchens (Bespoke) Limited | Manufacturing | 2008 |
| Kitty Hagenbach Ltd | Professional & scientific | 2023 |
| KJB Electrical Sales Ltd | Wholesale & retail | 2021 |
| KJE Property Ltd | Real estate | 2026 |
| KMC Financial Ltd | Financial services | 2017 |
| KMS Drylining Limited | Construction | 2007 |
| Knight & Butler (East Grinstead) Limited | Extraterritorial | 1961 |
| Knight Jewellers Ltd | Wholesale & retail | 2014 |
| Knighthood Corporate Assurance Services Limited | Financial services | 1974 |
| Kogo Creative Limited | Professional & scientific | 2024 |
| Kogo Holdings Limited | Professional & scientific | 2017 |
| Kogo Limited | Information & communication | 2001 |
| Kokonut Europe Ltd | Manufacturing | 2022 |
| Kongo Potash Limited | Mining & quarrying | 2025 |
| Koos Bookbinder Ltd | Manufacturing | 2025 |
| Kootoo Ltd | Wholesale & retail | 2011 |
| Korbizglobal Limited | Professional & scientific | 2022 |
| Korbizuk Ltd | Professional & scientific | 2015 |
| KRC Consulting Limited | Information & communication | 2001 |
| Kristina & BEN Properties Ltd | Real estate | 2024 |
| KSK Consultants Limited | Professional & scientific | 2004 |
| KSR Pro Ltd | Professional & scientific | 2023 |
| Kubblee Limited | Education | 2021 |
| Kwikfix Electrics Limited | Construction | 2025 |
| L & S P Milham Limited | Construction | 2013 |
| L.Arnold & SON Limited | Wholesale & retail | 1963 |
| LA Perla Supreme Ltd | Administrative & support | 2016 |
| LA Sante PAR LES Plantes, L'Alimentation ET L'Environnement Limited | Health & social care | 2007 |
| LAB Pilates Studio Ltd | Arts & recreation | 2025 |
| Labdo Limited | Professional & scientific | 2022 |
| Lacey Mechanical Services Limited | Energy | 2015 |
| Lacken Consultancy Limited | Professional & scientific | 2019 |
| Lady Lavender Ironing Ltd | Wholesale & retail | 2018 |
| Lafayette’S Academy Limited | Education | 2026 |
| Lampshire Holdings (UK) Ltd | Real estate | 2021 |
| Land Investments Group Limited | Real estate | 2024 |
| Landhurst Estate Limited | Households | 2013 |
| Landscape Ping Ltd | Manufacturing | 2021 |
| Langley Developments Limited | Construction | 2006 |
| Laurence & Rochelle Evans Ltd | Financial services | 2026 |
| Law Signalling Installations Ltd | Construction | 2022 |
| Layerbyte Limited | Wholesale & retail | 2025 |
| LD Cleaning Services (South East) Ltd | Administrative & support | 2026 |
| Learn Lift Grow Ltd | Health & social care | 2024 |
| Learnershape Ltd | Information & communication | 2019 |
| Learts Ltd | Education | 2025 |
| Legacy Renaissance Investment Ltd | Wholesale & retail | 2024 |
| Legends (Eltham) Ltd | Hospitality | 2018 |
| Leggat Plant & Civils Ltd | Construction | 2018 |
| Leggat Plant Group Ltd | Administrative & support | 2020 |
| Leka South East Limited | Construction | 2024 |
| Lemoid Ltd | Wholesale & retail | 2024 |
| Leonie Adeline Consulting Ltd | Professional & scientific | 2025 |
| Leosam Ltd | Construction | 2022 |
| Let's GET IT Wrapped Limited | Professional & scientific | 2023 |
| Leveret Systems Ltd. | Professional & scientific | 2014 |
| Lexington Freight Forwarding Ltd | Transport & logistics | 1998 |
| Lfirefly Ltd | Arts & recreation | 2025 |