| Kyrosai Ltd | Information & communication | 2025 |
| Kyrosofficial Ltd | Information & communication | 2025 |
| Kyzn Ltd | Health & social care | 2023 |
| L B Appliance Repair Limited | Other services | 2008 |
| L J Plumbing and Heating Limited | Construction | 2018 |
| L&C Electricomms Ltd | Construction | 2025 |
| L&H INT Co., Limited | Extraterritorial | 2014 |
| L&S Kendrick Holdings Limited | Financial services | 2025 |
| L8A Limited | Information & communication | 2022 |
| LA Belle Marketing Limited | Professional & scientific | 2017 |
| LA Construction Stafford Limited | Construction | 2022 |
| LA Eternity Ltd | Wholesale & retail | 2023 |
| LA Maison Blanche Limited | Hospitality | 2019 |
| LA Patisserie Limited | Wholesale & retail | 2006 |
| LA Propco Limited | Real estate | 2024 |
| LA Property Maintenance (Building Contractors) Ltd | Construction | 2019 |
| LA Property Solutions Ltd | Construction | 2023 |
| LA Retraite Limited | Other services | 2023 |
| Laclite LED Co., Ltd | Manufacturing | 2025 |
| Lafarge Boro Limited | Wholesale & retail | 2023 |
| Lafh Unused Limited | Financial services | 2025 |
| Lagoon Cover Ltd | Professional & scientific | 2025 |
| Lai's Investments LLP | | 2003 |
| Lailidelle Limited | Manufacturing | 2025 |
| Lakeland Blue Limited | Real estate | 2025 |
| Lakeside Fabrications Limited | Construction | 2012 |
| Lakshnas Retail Ltd | Wholesale & retail | 2021 |
| Lala Land Ltd | Real estate | 2017 |
| Lamo Technology Co., Limited | Extraterritorial | 2021 |
| Lamron Recruitment Ltd | Administrative & support | 2025 |
| LAN Commercial Co., Ltd | Wholesale & retail | 2023 |
| LAN TU Co. , Ltd | Manufacturing | 2024 |
| Landar Ltd | Construction | 2024 |
| Landline Lightfreight Limited | Transport & logistics | 2015 |
| Landon Engineering (Castle Works) Limited | Manufacturing | 1984 |
| Landowner Estates Limited | Real estate | 2025 |
| Landowner Limited | Manufacturing | 2015 |
| Landowner Products Limited | Manufacturing | 1981 |
| Landplatform Ltd | Information & communication | 2022 |
| Landreeve Ltd | Agriculture & fishing | 2020 |
| Landscape Maintenance Contracts Limited | Administrative & support | 2011 |
| Landswell Ltd | Real estate | 2024 |
| Landywood Landscapes Limited | Administrative & support | 2006 |
| Langford & Cohen Ltd | Real estate | 2015 |
| Langtao Ltd | Professional & scientific | 2022 |
| Lanmark Contracts Limited | Transport & logistics | 2026 |
| Lanvar Limited | Hospitality | 2003 |
| Lapley Clinical Ltd | Health & social care | 2021 |
| Lapley Developments Limited | Construction | 2015 |
| Lapley Roofing Limited | Construction | 2016 |
| Larino Limited | Real estate | 2019 |
| Larino Properties Limited | Real estate | 2024 |
| Lariyab Investment Limited | Real estate | 2026 |
| Laser-Ed Limited | Manufacturing | 2025 |
| Lashed by Lauren Ltd | Other services | 2023 |
| Later Life Legal Advice Ltd | Other services | 2024 |
| LAU GAR Limited | Education | 2010 |
| Launch Control Limited | Information & communication | 2017 |
| Launchmycareer Holdings PLC | Information & communication | 2018 |
| Laura BEE Consulting Limited | Administrative & support | 2022 |
| Laurence Galland Coaching Ltd | Professional & scientific | 2025 |
| Laurenza Cosmetic Co., Limited | Extraterritorial | 2021 |
| Lavender Florist Limited | Wholesale & retail | 2003 |
| Lavender Lane Kitchen Ltd | Hospitality | 2026 |
| Lawnpro Ltd | Administrative & support | 2014 |
| Lawton Bradford Accountants Ltd | Professional & scientific | 2017 |
| Laxmi Homes Ltd | Real estate | 2019 |
| Laxmi Property Solutions Ltd | Real estate | 2026 |
| Lazerblades Limited | Hospitality | 2019 |
| Lazy Days Cafe (Brewood) Ltd | Hospitality | 2021 |
| LB Downes Limited | Construction | 2008 |
| LB Inns (Harrows) Ltd | Hospitality | 2023 |
| LB Trading (Midlands) Ltd | Manufacturing | 2020 |
| LB Wealth Management Ltd | Financial services | 2020 |
| LBG Medical Ltd | Manufacturing | 1980 |
| LC Perpe Ltd | Wholesale & retail | 2023 |
| LCB Property Ltd | Real estate | 2017 |
| LCF Build Solutions Ltd | Construction | 2019 |
| LCP Connect Limited | Information & communication | 2017 |
| Lctunes Ltd | Wholesale & retail | 2025 |
| LDG Events Limited | Arts & recreation | 2025 |
| LDG Personal Styling Limited | Health & social care | 2022 |
| LDH Epoch Ltd | Wholesale & retail | 2023 |
| LDS Construction Ltd | Energy | 2023 |
| LE Beat Ltd | Arts & recreation | 2024 |
| LEA Hall Flats Property Management Limited | Real estate | 2025 |
| Lead Maintenance Solution Ltd | Construction | 2025 |
| Leadership for Impact Limited | Professional & scientific | 2026 |
| Leaf International Ltd | Wholesale & retail | 2018 |
| Leafields Farm Management Company Limited | Extraterritorial | 2005 |
| Leaguesight Ltd | Arts & recreation | 2025 |
| Lealec Electrical & Security Services Limited | Construction | 2021 |
| Leamore Signs UK Ltd | Professional & scientific | 2019 |
| Learn 2 Elevate Limited | Education | 2025 |
| Learnia Tech Ltd | Education | 2025 |
| Learnlight Education Ltd | Education | 2018 |
| Leasing Route Limited | Administrative & support | 2021 |
| Leather Emporium Limited | Wholesale & retail | 2011 |
| LEB Consultancy Limited | Professional & scientific | 2014 |
| Leca Trading Ltd | Manufacturing | 2024 |