| Kushog International Limited | Hospitality | 2020 |
| Kutz Above Banbury Ltd | Other services | 2025 |
| KVJ Properties Ltd | Real estate | 2025 |
| KW Clean & Fresh Ltd | Administrative & support | 2025 |
| KW Technical Services Ltd | Professional & scientific | 2026 |
| Kymaco Ltd | Information & communication | 2024 |
| Kyntoro Ltd | Wholesale & retail | 2025 |
| Kyre Consulting Ltd | Administrative & support | 2026 |
| Kytson Mortgages & Finance Limited | Professional & scientific | 2019 |
| KZ Goalkeeper Development Ltd | Education | 2023 |
| KZ Mart Limited | Wholesale & retail | 2025 |
| Kzll Holding Ltd | Financial services | 2023 |
| L a Hirons Limited | Health & social care | 2008 |
| L J Construction Carpentry Contractors Limited | Construction | 2007 |
| L. Jarvis & Sons Ltd | Wholesale & retail | 2015 |
| L. Symington Plumbing & Heating Ltd | Construction | 2024 |
| L.B.A.S Limited | Professional & scientific | 2003 |
| L.S.Sushi Limited | Manufacturing | 2023 |
| LA Cantina Mexican Kitchen Ltd | Hospitality | 2024 |
| LA Cumatru Ltd | Wholesale & retail | 2020 |
| LA Development (Banbury) Ltd | Real estate | 2021 |
| LA Foglia Limited | Hospitality | 2017 |
| LA Poterie Limited | Professional & scientific | 2021 |
| LA Survey Ltd | Professional & scientific | 2018 |
| Labformulations Ltd | Wholesale & retail | 2018 |
| Ladypchigs Ltd | Public administration | 2025 |
| Lagan Biddenham Limited | Construction | 2011 |
| Lagan Dott Namanve Ltd | Construction | 2018 |
| Lagan GB Holdco 2 Limited | Professional & scientific | 2026 |
| Lagan GB Holdco Limited | Professional & scientific | 2026 |
| Lagan Homes (Bloxham Road) Limited | Construction | 2025 |
| Lagan Homes (Coventry) Limited | Extraterritorial | 2008 |
| Lagan Homes (Fairham) Limited | Construction | 2024 |
| Lagan Homes (Kidlington) Limited | Construction | 2025 |
| Lagan Homes (Leicester) Limited | Construction | 2025 |
| Lagan Homes (Northfield) Limited | Construction | 2007 |
| Lagan Homes (Ravenshead) Limited | Construction | 2024 |
| Lagan Homes Banbury Limited | Construction | 2014 |
| Lagan Homes England Group Limited | Professional & scientific | 2025 |
| Lagan Homes Holdco (Banbury) Limited | Construction | 2014 |
| Lagan Shefford Limited | Construction | 2010 |
| Laguna London Limited | Professional & scientific | 2021 |
| Laguna Marketing Limited | Professional & scientific | 2022 |
| Laister Planning Limited | Administrative & support | 2020 |
| Lak's Thai Kitchen Limited | Hospitality | 2017 |
| Lake Acacia Ltd | Wholesale & retail | 2019 |
| Lake Real Estate Limited | Real estate | 2023 |
| Lake Street Consulting Limited | Professional & scientific | 2014 |
| Laminationnation Limited | Professional & scientific | 2026 |
| Lampost 14 Limited | Professional & scientific | 2005 |
| Lamprey & SON Limited | Other services | 1948 |
| Lance UK Limited | Administrative & support | 2004 |
| Landsite Limited | Information & communication | 2012 |
| Lane Design Limited | Professional & scientific | 2013 |
| Lansen Ventures Ltd | Wholesale & retail | 2025 |
| Lapis Luxe Limited | Wholesale & retail | 2024 |
| Laqi Hand Car Wash Ltd | Other services | 2018 |
| Laraboss Ltd | Transport & logistics | 2024 |
| Laser Lines (UK) Limited | Extraterritorial | 2000 |
| Laser Lines Group Limited | Wholesale & retail | 2017 |
| Last Iota Limited | Information & communication | 2010 |
| Latest Sightings (UK) Ltd | Manufacturing | 2023 |
| Latitude Financial Planning Ltd | Extraterritorial | 2022 |
| Laurus Group Limited | Professional & scientific | 2026 |
| Lauton Blue Limited | Construction | 2026 |
| Lauton Developments Limited | Construction | 2025 |
| Lavender Construction Limited | Professional & scientific | 1996 |
| Lawns Matter Ltd | Administrative & support | 2020 |
| Lawnscote Holdings Limited | Financial services | 2022 |
| Laws & Fiennes LLP | | 2019 |
| Lawyers INK Limited | Information & communication | 2012 |
| Lbcf Limited | Extraterritorial | 1983 |
| Lcmb Building Performance Ltd. | Professional & scientific | 2009 |
| LD Accountancy Limited | Professional & scientific | 2022 |
| LDH Management Limited | Real estate | 2021 |
| LE 2V Limited | Professional & scientific | 2021 |
| Leadbeater Services Limited | Administrative & support | 2008 |
| Leading for Impact Limited | Professional & scientific | 2025 |
| Leadspark (Events) Ltd | Professional & scientific | 2023 |
| Leaf Network Ltd | Education | 2025 |
| Lean Leadership Way Ltd | Professional & scientific | 2020 |
| Leasowes Farm Limited | Agriculture & fishing | 2001 |
| Leemug Limited | Education | 2014 |
| Legends Experiences Limited | Arts & recreation | 2023 |
| Leia Bidco Ltd | Financial services | 2021 |
| Leia Topco Ltd | Financial services | 2021 |
| Leisure Interiors 2000 Limited | Extraterritorial | 1997 |
| Lemnos UK Limited | Information & communication | 2019 |
| Lenny's Banbury Ltd | Administrative & support | 2019 |
| Leonessa Electrical Limited | Professional & scientific | 2017 |
| Leons HCW Ltd | Other services | 2025 |
| Letnet Limited | Other services | 1997 |
| Lets LIV Limited | Real estate | 2023 |
| Level 66 Limited | Real estate | 2017 |
| Levi Barber Ltd | Other services | 2026 |
| Lexa Electrical Ltd | Construction | 2026 |
| Lexacom Limited | Extraterritorial | 2014 |
| Lexacom Scribe Limited | Administrative & support | 2018 |
| LF Home Improvement Ltd | Construction | 2014 |
| LFT Holdings Limited | Construction | 2019 |