| KP Properties & Investments Limited | Real estate | 2025 |
| KR Retail Ltd | Wholesale & retail | 2018 |
| Kris Clearance Limited | Water & waste | 2016 |
| Kris Facades & Construction Limited | Construction | 2026 |
| Krishika Properties Ltd | Real estate | 2022 |
| Kristian Neiko 90 Ltd | Construction | 2019 |
| KRS Supplies Ltd | Wholesale & retail | 2021 |
| KS4 Services Limited | Construction | 2025 |
| KSG Elite Chauffeurs Ltd | Other services | 2014 |
| Kspa UK Ltd | Wholesale & retail | 2024 |
| Kturehair Ltd | Other services | 2026 |
| KUMAR108 Ltd | Professional & scientific | 2023 |
| Kussi Ltd | Wholesale & retail | 2024 |
| KVS Construction Ltd | Construction | 2016 |
| Kwadwoa Services(Uk) Limited | Health & social care | 2017 |
| Kwamz Consultancy Ltd | Information & communication | 2022 |
| Kynaston 1969 Limited | Extraterritorial | 2013 |
| Kyngs Chauffeur Service Ltd | Transport & logistics | 2026 |
| Kyngs Service Limited | Professional & scientific | 2019 |
| KZ African Market Ltd | Wholesale & retail | 2015 |
| K’Aura Beauty Ltd | Wholesale & retail | 2020 |
| L & P S W Management Ltd | Real estate | 2025 |
| L&A Accountants Ltd | Professional & scientific | 2023 |
| L.C.Rail Limited | Professional & scientific | 2022 |
| L.Graham & Co Ltd. | Construction | 2023 |
| L.O.O Group Ltd | Financial services | 2026 |
| L.R.S Cleaning Ltd | Administrative & support | 2023 |
| L2U (East Gate) Property Ltd | Real estate | 2021 |
| L2U Home Ltd | Real estate | 2021 |
| L2U Home(Thornton Heath) Ltd | Real estate | 2023 |
| LA & Sons Ltd | Wholesale & retail | 2023 |
| LA Assets Limited | Real estate | 2024 |
| LA Electrical Services Ltd | Construction | 2026 |
| LA Pasta DI Peppe Ltd | Hospitality | 2025 |
| LA Stile Ltd | Wholesale & retail | 2021 |
| Lacey & Sons Haulage Limited | Transport & logistics | 2010 |
| Ladel's Day Nursery Limited | Education | 2007 |
| Lady Boutique Ltd | Wholesale & retail | 2021 |
| Laekos Limited | Extraterritorial | 2024 |
| Laja Than Life Ltd | Real estate | 2020 |
| Lajwaard Fragrances Ltd | Manufacturing | 2024 |
| Lamessentials Ltd | Wholesale & retail | 2025 |
| Lamosh Support Services Ltd | Health & social care | 2023 |
| Lanescombe Limited | Information & communication | 2015 |
| Lashes Nails and Brows Ltd | Health & social care | 2020 |
| Latds Limited | Real estate | 2023 |
| Lavt Solutions Ltd | Professional & scientific | 2021 |
| Laxmi Narayan Ltd | Wholesale & retail | 2022 |
| LC Renovation Limited | Construction | 2017 |
| LCM Brand Communications Ltd | Professional & scientific | 2024 |
| Leadership Arts Academy Ltd | Education | 2024 |
| Leadership in Education Services Ltd | Education | 2015 |
| Leckhampton 68 Church Road Ltd | Construction | 2022 |
| Ledar Limited | Health & social care | 2020 |
| Leena Creation Private Limited | Wholesale & retail | 2025 |
| Legacy (DS) Ltd | Real estate | 2011 |
| Legends Builders Ltd | Construction | 2022 |
| Legends Property Management Ltd | Households | 2025 |
| Lekod Consulting Ltd | Professional & scientific | 2011 |
| Leondo Limited | Other services | 2018 |
| Lets Move Together Limited | Construction | 2009 |
| Let’S Talk Educational Services Ltd | Education | 2023 |
| Lexed Consultants Ltd | Education | 2026 |
| LF Productions Ltd | Professional & scientific | 2025 |
| LHW Partners Limited | Administrative & support | 2023 |
| Liberty Reformer Ltd | Arts & recreation | 2025 |
| Libritting Ltd | Wholesale & retail | 2025 |
| Lick YUH Lips Caribbean Ltd. | Wholesale & retail | 2011 |
| Lifegrace Bookshop & Groceries Limited | Wholesale & retail | 2020 |
| Lifegrace Ministries International Ltd | Other services | 2025 |
| Lilly & FLY Investments Ltd | Administrative & support | 2025 |
| Limina Ltd | Health & social care | 2025 |
| Lindsay Lettings Ltd | Real estate | 2014 |
| Lingam Solutions Ltd | Information & communication | 2020 |
| Link Telecom Commercial Limited | Information & communication | 2015 |
| LINK2MOBILE Ltd | Wholesale & retail | 2022 |
| Lira Music UK Ltd | Information & communication | 2023 |
| Lisali Ltd | Health & social care | 2022 |
| Listed Promotions Ltd | Information & communication | 2023 |
| Little Flower Adults Care Ltd | Health & social care | 2023 |
| Little Nigril Juice Bar & Grill Limited | Hospitality | 2020 |
| Little Pioneers Ltd | Hospitality | 2026 |
| Little Winners Day Nursery Limited | Education | 2002 |
| Livspace Lofts & Extensions Ltd | Construction | 2016 |
| Lizzie Investment Ltd | Real estate | 2023 |
| LJ Sparkle Ltd | Construction | 2019 |
| LJK Property Ltd | Real estate | 2024 |
| LKF Entertainment Ltd | Education | 2026 |
| LLM Media Productions Limited | Information & communication | 2024 |
| Lloyd Joseph Ltd | Professional & scientific | 2014 |
| LM Clinical Ltd | Public administration | 2025 |
| LMP Builders Ltd | Construction | 2010 |
| LMS Tech Projects Ltd | Information & communication | 2024 |
| Lndn Group Ltd | Manufacturing | 2025 |
| Lo'Rache Hair Supplies Limited | Other services | 2025 |
| Local Construction Solution Ltd | Construction | 2017 |
| Lockfit Croydon Ltd | Other services | 2023 |
| Logicsphere IT Hub Limited | Information & communication | 2025 |
| Loka Builders Ltd | Construction | 2019 |
| Lokai Construction Ltd | Construction | 2024 |