| Kasias Polish Market Ltd | Wholesale & retail | 2025 |
| Katherine Mcdonagh Enterprise Ltd | Hospitality | 2024 |
| KAY Gees Drinks Limited | Wholesale & retail | 2014 |
| Kayser Space Limited | Manufacturing | 2015 |
| KD Freelance Ltd | Administrative & support | 2016 |
| Keen Dist Ltd | Wholesale & retail | 2012 |
| Kelpie Capital Ltd | Real estate | 2018 |
| KEN Dodd Associates Limited | Professional & scientific | 2001 |
| Kendall Renovations Ltd | Construction | 2021 |
| Kenoble Ltd | Information & communication | 2025 |
| KEV Auto Mechs Ltd | Wholesale & retail | 2026 |
| Keyboard Properties Ltd | Real estate | 2024 |
| Keys of Hope Ltd | Administrative & support | 2019 |
| KGS Haulage Limited | Transport & logistics | 2023 |
| KIN Stays Estates Ltd | Real estate | 2024 |
| Kingfisher Gardening Ltd | Administrative & support | 2019 |
| Kinghorn Management Limited | Financial services | 2019 |
| Kirbycoconsulting Ltd | Professional & scientific | 2023 |
| Kitchenroom Ltd | Wholesale & retail | 2015 |
| Kiyora Limited | Information & communication | 2008 |
| Kjb's Bubble Football Ltd | Arts & recreation | 2014 |
| Knots&Co. Limited | Wholesale & retail | 2025 |
| KO Global Holdings Limited | Financial services | 2024 |
| Kognitiv Spark UK Limited | Information & communication | 2023 |
| Koin Investments Ltd | Real estate | 2025 |
| Kokomo Studio Limited | Administrative & support | 2009 |
| Kolkata Bazar Ltd | Hospitality | 2019 |
| Kongsberg Nanoavionics UK Ltd | Professional & scientific | 2018 |
| Koringa Systems UK Ltd. | Professional & scientific | 2018 |
| Kostas Carpentry Services Limited | Manufacturing | 2017 |
| Kozha London Ltd | Manufacturing | 2018 |
| KP Chiro Services Limited | Health & social care | 2022 |
| KR Beauty Ltd | Other services | 2023 |
| KR Trade and Investments Private Ltd | Financial services | 2024 |
| Kriana Limited | Wholesale & retail | 2021 |
| Krishn Vinod Properties Ltd | Real estate | 2023 |
| Kuber POT Limited | Information & communication | 2023 |
| Kubu Spa (Henley) Ltd | Other services | 2016 |
| KW Electric Heating Ltd | Construction | 2026 |
| L-Gem Development Ltd | Wholesale & retail | 2025 |
| L. and P. Worth LLP | | 2010 |
| Lacuna Space Ltd. | Information & communication | 2016 |
| Ladislav Borsanyi Ltd | Transport & logistics | 2011 |
| Ladybird Accountancy Ltd | Professional & scientific | 2021 |
| Ladybird Pre-School Limited | Education | 2002 |
| Ladygrove Park Primary School | Education | 2013 |
| Lagen Property Ltd | Real estate | 2019 |
| Lake House Developments Limited | Construction | 2015 |
| Landed Capital Holdings Ltd | Financial services | 2019 |
| Landsquare Ltd | Construction | 2025 |
| Langdon Hill Ltd | Professional & scientific | 2024 |
| Lantan Limited | Real estate | 2023 |
| Latin Odyssey Limited | Administrative & support | 2008 |
| Laussat Limited | Real estate | 2021 |
| Lava Works Limited | Manufacturing | 2024 |
| Lawfull Associates (Consulting Engineers) Limited | Professional & scientific | 2009 |
| Lawnscience (South and West Oxfordshire) Ltd | Administrative & support | 2025 |
| Lawson FI Ltd | Real estate | 2024 |
| LBR Decorating Ltd | Construction | 2018 |
| LC Bass Events Ltd | Administrative & support | 2026 |
| Lchre Ltd | Real estate | 2024 |
| Leaflike Group Limited | Wholesale & retail | 2020 |
| Lean on ME Befriending Services Community Interest Company | Health & social care | 2024 |
| LEE Aviation Ltd | Transport & logistics | 2026 |
| Legacy Accounting Services Ltd | Professional & scientific | 2020 |
| Legacy Cleaners Ltd | Administrative & support | 2021 |
| Legacy Investors Ltd | Real estate | 2018 |
| Legacy Leads Ltd | Information & communication | 2024 |
| Legacy Outsourcing Ltd | Administrative & support | 2024 |
| Legacy Property Sales & Lettings Ltd | Real estate | 2023 |
| Legacy Property Sourcing Ltd | Real estate | 2021 |
| Legacy Renovations & Maintenance Ltd | Construction | 2018 |
| Legacy Serviced Accommodations Ltd | Households | 2025 |
| Leggiero Property Limited | Real estate | 2025 |
| Lemon Group International Limited | Information & communication | 2006 |
| Leomaa Ltd | Wholesale & retail | 2016 |
| Lestaa Limited | Administrative & support | 2020 |
| Leverton Parker Property Ltd | Real estate | 2022 |
| Lexigen Holdings Limited | Administrative & support | 2015 |
| Lhrd Consulting Ltd | Professional & scientific | 2026 |
| Liberty International Ltd | Information & communication | 2022 |
| Life Balance Body Therapy Ltd | Other services | 2023 |
| Lighting Electrical Distribution Ltd | Wholesale & retail | 1952 |
| Lincombe Group Limited | Real estate | 2025 |
| Linn Barnett (REACH4SPACE) Ltd | Professional & scientific | 2025 |
| Linn Barnett Holdings Ltd | Financial services | 2026 |
| Linnells Number TEN Limited | Real estate | 1999 |
| Linq Consultancy Ltd | Education | 2023 |
| Little Acres Kent Ltd | Real estate | 2024 |
| Little Dome Studio Ltd | Manufacturing | 2026 |
| Little Pippins Pre-School | Education | 2004 |
| Littlecombe Law Ltd | Professional & scientific | 2014 |
| LK & YK Property Ltd | Real estate | 2022 |
| LMM (Windows, Doors and Conservatories) Limited | Construction | 2018 |
| LN Building&Carpentry Ltd | Construction | 2025 |
| Lodestone Enterprise Ltd | Information & communication | 2026 |
| London Chicks Ltd | Hospitality | 2025 |
| London Glades Ltd | Administrative & support | 2017 |
| Longam Healthcare Limited | Health & social care | 2019 |
| Love Clementine Ltd | Wholesale & retail | 2025 |