| Kudos Publishing Ltd | Information & communication | 2021 |
| Kulathoor Limited | Real estate | 2005 |
| Kuttanad Kerala Style Ltd | Hospitality | 2026 |
| Kutus Kutus Ltd | Wholesale & retail | 2019 |
| KVM Consultants Limited | Information & communication | 2013 |
| KVM Properties Limited | Real estate | 2025 |
| KWB Cyber Ltd | Information & communication | 2023 |
| KWH Property Ltd | Real estate | 2021 |
| Kyanya Consulting Ltd | Information & communication | 2014 |
| Kylor Ltd | Hospitality | 2025 |
| Kyri Ltd | Wholesale & retail | 2010 |
| L & a Russell Property Ltd | Real estate | 2021 |
| L & L Properties Investment Limited | Real estate | 2020 |
| L & L Services (Hertford) Limited | Other services | 2023 |
| L a Construction (AL) Ltd | Construction | 2025 |
| L Hathaway Gyms Limited | Arts & recreation | 2021 |
| L J Carpentry & Joinery Limited | Construction | 2021 |
| L Killick Roof Repairs Ltd | Construction | 2025 |
| L S Building Ltd | Construction | 2020 |
| L Wedderburn Ltd | Administrative & support | 2020 |
| L&M Building & Carpentry Services Ltd | Manufacturing | 2023 |
| L&T DA Limited | Real estate | 2026 |
| L. Lynch (Holdings) Limited | Construction | 1990 |
| L. Lynch (Plant Hire & Haulage) Limited | Construction | 1993 |
| L. Lynch Plant Hire Limited | Administrative & support | 1986 |
| LA Bassine Limited | Wholesale & retail | 2010 |
| LA Belle Hair N Beauty Salon Ltd | Health & social care | 2015 |
| LA Comida Ltd. | Wholesale & retail | 2013 |
| LA Maison Assets Limited | Real estate | 2017 |
| LA Siddhi Consultancy Limited | Administrative & support | 2018 |
| Lababi’S Ltd | Hospitality | 2023 |
| Labelplan Ltd | Administrative & support | 2006 |
| Laboratoire Couture Limited | Manufacturing | 2022 |
| Laburnum Gardens (Hitchin) Management Company Limited | Households | 2016 |
| LAC Consultants Limited | Extraterritorial | 2011 |
| Lacey Avenue Ltd | Real estate | 2023 |
| Lacey Brown Hair & Beauty Ltd | Other services | 2018 |
| Ladden Garden Village Apartments Residents Management Company Limited | Households | 2023 |
| LAE Financial Insights Limited | Financial services | 2017 |
| LAF Services Ltd | Other services | 2017 |
| Lafarge UK Pension Trustees Limited | Administrative & support | 1990 |
| LAG Consultancy Services Ltd | Professional & scientific | 2019 |
| Lakeland Hosts Ltd | Hospitality | 2011 |
| Lakeside at Mindenhurst Residents Management Company Limited | Households | 2025 |
| Lakeside Management (Railway Terrace) Limited | Households | 2019 |
| Lakme Beauty Limited | Other services | 2025 |
| Land Escape Limited | Administrative & support | 2007 |
| Land Investment Property Services MK Ltd | Real estate | 2018 |
| Landesigns Limited | Administrative & support | 2009 |
| Landimore Park (Hardingstone) Management Company Limited | Households | 2021 |
| Landmark Square Wokingham Management Company Ltd | Households | 2020 |
| Langford Park Management Company Limited | Households | 2017 |
| Langley Road Management Company Limited | Households | 2018 |
| Langleys Chapelfield Limited | Administrative & support | 2019 |
| Langleys House Clearance Ltd | Real estate | 2023 |
| Langleys Toys Limited | Administrative & support | 2015 |
| Langshott Park (Horley) Management Company Limited | Households | 2013 |
| Langwood 360 Limited | Professional & scientific | 2011 |
| Lann's Ltd | Financial services | 2022 |
| Lannister & Co Enterprises Ltd | Financial services | 2016 |
| Lannister & Co Investments Ltd | Real estate | 2016 |
| Lannister Holdings Ltd | Financial services | 2016 |
| Lanpro Classic & Vintage Ltd | Administrative & support | 2024 |
| Lanyard Planet Ltd | Manufacturing | 2016 |
| Lapa Delivery Limited | Transport & logistics | 2016 |
| Lara KAY and Sons Limited | Wholesale & retail | 2025 |
| Lara Productions Limited | Information & communication | 1994 |
| Larco Enterprises Ltd | Households | 2023 |
| Laria Health Ltd | Health & social care | 2020 |
| Larksfield (Witham) Residents Company Limited | Households | 2009 |
| Larkswood Management Company Limited | Households | 1987 |
| Larman Cleaning Services Limited | Administrative & support | 2016 |
| Larq Limited | Professional & scientific | 2003 |
| Laserline AC Ltd | Extraterritorial | 2022 |
| Lastinghealth.Com Limited | Health & social care | 2017 |
| Lastlight Design Ltd | Professional & scientific | 2023 |
| Latham Timber Centres (Bridgwater) Ltd. | Wholesale & retail | 1987 |
| Lathams Limited | Wholesale & retail | 1969 |
| Latimer Gade Investments Ltd | Real estate | 2023 |
| Latimer Gade Limited | Financial services | 2014 |
| Latitude Residents Limited | Households | 2017 |
| Laughing Badger SQ Ltd | Arts & recreation | 2022 |
| Laura Goodes Communications Ltd | Professional & scientific | 2022 |
| Laura Hannan Ltd | Professional & scientific | 2018 |
| Laurel Grove (Fareham) Management Company Limited | Households | 2016 |
| Laurel Heights (North Shields) Management Company Limited | Households | 2007 |
| Laurtransport Limited | Transport & logistics | 2025 |
| LAV Carpentry Ltd | Construction | 2019 |
| Lavender Fields Isfield Management Company Limited | Households | 2015 |
| Lavina Consultancy Ltd | Professional & scientific | 2025 |
| Lavish Removals Ltd | Transport & logistics | 2025 |
| Lavitrans Ltd | Transport & logistics | 2019 |
| Law Resource Ltd | Other services | 2018 |
| Lawes Chase Management Company (Farndon) Limited | Households | 2007 |
| Lawford & Sons Limited | Real estate | 1910 |
| Lawfords Properties Ltd | Real estate | 2021 |
| Lawler Heating and Plumbing Limited | Construction | 2021 |
| Lawley Farm (Telford) Mangement Company Limited | Households | 2008 |
| Lawn Lane (Hemel Hempstead) Management Company Limited | Real estate | 2005 |
| Lawn Lane Management Company Ltd | Households | 2006 |