| Konakane Ltd | Extraterritorial | 2024 |
| Konesco Ltd | Hospitality | 2022 |
| Korlo Ltd | Information & communication | 2026 |
| Kosech Ltd | Professional & scientific | 2014 |
| Kpmc Consulting Limited | Wholesale & retail | 2011 |
| Kpmc Housing Limited | Real estate | 2023 |
| Kpmv Consulting Ltd | Real estate | 2023 |
| KR Ceiling Ltd | Construction | 2014 |
| Kritan Properties Limited | Real estate | 2018 |
| Kriya Consulting Limited | Professional & scientific | 2024 |
| KRK Enterprises Limited | Real estate | 2012 |
| Kryoflux Products & Services Limited | Manufacturing | 2010 |
| Krysron Ltd | Health & social care | 2011 |
| Kshd Property Limited | Real estate | 2017 |
| KSR Interior Design Limited | Professional & scientific | 2018 |
| KSR Residences Limited | Real estate | 2025 |
| Ksvp Ltd | Professional & scientific | 2021 |
| Kude Tutors Ltd | Professional & scientific | 2024 |
| Kudu Bidding Ltd | Professional & scientific | 2019 |
| Kuisine Malaysia Limited | Hospitality | 2013 |
| Kukipa Limited | Information & communication | 2023 |
| Kuma Labs Ltd | Arts & recreation | 2023 |
| Kura Freehold Limited | Real estate | 2017 |
| Kuzey Marine Ltd | Transport & logistics | 2018 |
| Kwikchefs Ltd | Hospitality | 2018 |
| Kyle Andrews Ltd | Construction | 2018 |
| Kyzan Hairdressing Limited | Other services | 2001 |
| L & D Agency Ltd | Information & communication | 2015 |
| L & E Richmond Property Services Ltd | Administrative & support | 2014 |
| L E Construction & Maintenance Ltd | Construction | 2024 |
| L&A Materials Management Limited | Mining & quarrying | 2019 |
| L. P. G. Sales Limited | Wholesale & retail | 2022 |
| L.Guess Ltd | Wholesale & retail | 2007 |
| L2HL Limited | Other services | 2005 |
| LA Floor Decoring Ltd | Construction | 2026 |
| Labe 2026 Limited | Hospitality | 2026 |
| Lads Property Services Limited | Households | 2025 |
| LAI Robinson Limited | Health & social care | 2021 |
| Laini Paper Limited | Real estate | 2019 |
| Lakshmi SAI Info Limited | Information & communication | 2011 |
| Lalaluna Ltd | Wholesale & retail | 2012 |
| Landris Technologies Ltd | Information & communication | 2026 |
| Lane 4 Promotions Ltd | Education | 2025 |
| Laney Automotive Limited | Wholesale & retail | 2024 |
| Laney Property Holdings Limited | Real estate | 2024 |
| Langham Court Residents Association Limited | Households | 1992 |
| Langton Electronic Publishing Systems Limited | | 1987 |
| Lansdowne Building & Civil Engineering Limited | Construction | 2018 |
| Lappin Property Management Ltd | Real estate | 2013 |
| LAPTOPS4BUSINESS Ltd | Households | 2026 |
| Larkhall Holdings Limited | Financial services | 2019 |
| Larkhall Lane Developments Limited | Construction | 2019 |
| Larkmere Limited | Professional & scientific | 2024 |
| Last Passenger Limited | Administrative & support | 2011 |
| Last TRY Wines Ltd | Wholesale & retail | 2010 |
| Laura C Cook Consulting Limited | Information & communication | 2017 |
| Laura Kate Properties Ltd | Real estate | 2025 |
| Layercake Ltd | Professional & scientific | 2013 |
| Laylacom Ltd | Information & communication | 2010 |
| Layton Henderson Properties Ltd | Real estate | 2022 |
| Lazy Girl Jewellery Co Limited | Manufacturing | 2022 |
| LB Property Ventures Limited | Real estate | 2024 |
| LC Business Consulting Services Ltd | Professional & scientific | 2026 |
| LCY Consulting Ltd | Professional & scientific | 2012 |
| LDL Coaching Limited | Education | 2021 |
| LDN Central Services Limited | Wholesale & retail | 2023 |
| LE Sommet Consultancy Limited | Professional & scientific | 2025 |
| LEA London Education Consultancy Ltd | Education | 2024 |
| Lead Counsel Limited | Professional & scientific | 2017 |
| Leadai Limited | Information & communication | 2026 |
| Leadership Echelon Ltd | Other services | 2017 |
| Leading Edge Electrical Limited | Construction | 2015 |
| Leanark Limited | Information & communication | 2015 |
| Leander Property Ltd | Real estate | 2019 |
| Leaps and Bounds Therapy Ltd | Health & social care | 2007 |
| Learning Studios Online Limited | Education | 2024 |
| Leaserise Limited | Real estate | 1998 |
| Leatherlove Ltd | Wholesale & retail | 2009 |
| Lectra Tech Ltd | Construction | 2023 |
| Ledbury Trading Co. Ltd | Manufacturing | 2017 |
| LEE Mullins Personal Training & Lifestyle Company Ltd | Arts & recreation | 2016 |
| Leela London Ltd | Wholesale & retail | 2025 |
| Lefty Ltd | Wholesale & retail | 2023 |
| Legacy Commerce Holdings Ltd | Wholesale & retail | 2025 |
| Legal and Financial Advisory Services Limited | Wholesale & retail | 2024 |
| Legal Study Skills Limited | Administrative & support | 2024 |
| Leigh Gardens Limited | Administrative & support | 2021 |
| Lenscapes Press Ltd | Information & communication | 2021 |
| Lesedi Health Limited | Health & social care | 2016 |
| LET Slip Productions Ltd | Information & communication | 2016 |
| Let's DO Some Good Ltd | Professional & scientific | 2025 |
| Let's Go Outside and Learn Community Interest Company | Education | 2015 |
| Levels Invest Limited | Real estate | 2022 |
| LEX Logistics Ltd | Transport & logistics | 2022 |
| Lexington Holdings Management Ltd | Real estate | 2025 |
| LG Eco Limited | Construction | 2014 |
| LGH Group Holdings Ltd | Administrative & support | 2023 |
| LH Oasis Services Ltd | Other services | 2025 |
| Life and Careers Ltd | Information & communication | 2017 |
| Life Balancing Ltd | Professional & scientific | 2006 |