| Logistics Z Ltd | Transport & logistics | 2025 |
| Logistics Z Ltd Limited | Construction | 2024 |
| Logodek Limited | Information & communication | 2024 |
| Logos Holdings Ltd | Information & communication | 2021 |
| Logos Trans. Ltd | Manufacturing | 2019 |
| Logplot Limited | Real estate | 1988 |
| Lohmacs Limited | Information & communication | 1986 |
| Loko Plovdiv Ltd | Transport & logistics | 2026 |
| Lokokess Limited | Transport & logistics | 2024 |
| LOL Theatre Arts Limited | Arts & recreation | 2011 |
| Lomo Ltd | Transport & logistics | 2020 |
| Londis Mill Road Ltd | Wholesale & retail | 2011 |
| Londis Price Cutter Ltd | Wholesale & retail | 2021 |
| London Fitness Holdings Ltd | Arts & recreation | 2021 |
| London in a Box Ltd | Wholesale & retail | 2016 |
| London International Qualifications Limited | Education | 2018 |
| London Internet Exchange Limited | Information & communication | 1995 |
| London Internet Exchange Trading Limited | Information & communication | 2013 |
| London Road Car Wash Ltd | Other services | 2009 |
| London Road Grocery Ltd | Wholesale & retail | 2024 |
| London Road Peterborough Properties Limited | Financial services | 2021 |
| London Road Pizzas Ltd | Manufacturing | 2015 |
| London Rock Projects Ltd | Professional & scientific | 2025 |
| London Top Style Limited | Wholesale & retail | 2022 |
| Londox Properties Ltd | Real estate | 2020 |
| Lone GUN Productions Ltd | Information & communication | 2021 |
| Long Field Housing Ltd | Construction | 2017 |
| Long Financial Services Holdings Limited | Real estate | 2020 |
| Long Rock Services Ltd | Financial services | 2024 |
| Long Tall Productions Ltd | Arts & recreation | 2024 |
| Long Tall Sally Limited | Wholesale & retail | 2021 |
| Longland Electrical & Building Services Ltd | Construction | 2025 |
| Longtail Digital Limited | Information & communication | 2018 |
| Longthorpe Limited | Real estate | 2020 |
| Longthorpe Stores Ltd | Wholesale & retail | 2018 |
| Longwater Property Ltd | Real estate | 2024 |
| Longwood Childrens Home Ltd | Health & social care | 2024 |
| Lonobo Ltd | Wholesale & retail | 2016 |
| Loop Platforms Limited | Administrative & support | 2025 |
| Lopez Property Ventures Limited | Construction | 2025 |
| Lord Loxleys FOA Ltd | Other services | 2021 |
| Lordship Capital Limited | Real estate | 2020 |
| Lordship Holdings Limited | Real estate | 2019 |
| Lordship Partners Limited | Real estate | 2017 |
| Lorek Transport Ltd | Transport & logistics | 2016 |
| Loretto Bridge Ltd | Professional & scientific | 2024 |
| Lorrelcare Ltd | Health & social care | 2018 |
| Lorry Transport KME Ltd | Transport & logistics | 2017 |
| LOS Finance Ltd | Financial services | 2024 |
| Lote Tree Counselling Limited | Other services | 2011 |
| Lote Tree Properties Ltd | Real estate | 2025 |
| Lotos Care Ltd | Wholesale & retail | 2019 |
| Lotus Homes Property Management Ltd | Households | 2025 |
| Louis Smith Photography Ltd | Information & communication | 2023 |
| Louisas Lodges Ltd | Manufacturing | 2025 |
| Lounge Pboro Ltd | Hospitality | 2020 |
| Lova Hospitality Ltd | Wholesale & retail | 2025 |
| Love Abundance Limited | Professional & scientific | 2022 |
| Love Bargain Buys Ltd | Wholesale & retail | 2025 |
| Love Hair Brixton Limited | Extraterritorial | 2015 |
| Love Kitchens Ltd | Construction | 2012 |
| Love of Music Limited | Hospitality | 2023 |
| Love Realty Ltd | Real estate | 2020 |
| Love Your Health UK Limited | Wholesale & retail | 2024 |
| Lovegrace Home Care Ltd | Health & social care | 2013 |
| Lovell Engineering Consultants and Support Ltd | Professional & scientific | 2023 |
| Loveoneenergy Limited | Wholesale & retail | 2025 |
| Lovett Building Limited | Construction | 2016 |
| Lovett Properties Limited | Hospitality | 2001 |
| LOW Life Limited | Information & communication | 2022 |
| LOW Life Music Limited | Manufacturing | 2024 |
| Lowd & Klea Limited | Administrative & support | 2001 |
| Lower Hope Nominee LLP | | 2022 |
| Lowfield Lane Limited | Households | 2014 |
| Lowther Productions Limited | Agriculture & fishing | 2003 |
| Loxley Literary Ltd | Information & communication | 2025 |
| LP Health Ltd | Financial services | 2020 |
| LP Race Transport Ltd | Transport & logistics | 2025 |
| LP SD One Hundred Twelve Limited | Wholesale & retail | 2023 |
| Lpac Client Services Limited | Information & communication | 2026 |
| Lpkj Properties Ltd | Real estate | 2024 |
| Lplpuk Limited | Other services | 2023 |
| LPT Diagnostic Reporting Limited | Health & social care | 2021 |
| LR Construction and Electric Ltd | Construction | 2020 |
| LR Mini Market Ltd | Wholesale & retail | 2026 |
| LRP Mortgage Services Ltd | Financial services | 2023 |
| Lrta (Publishing) Limited | Information & communication | 2007 |
| LS Breaks Ltd | Wholesale & retail | 2025 |
| LS Elec Ltd | Construction | 2022 |
| LS Paving Ltd | Construction | 2020 |
| LS Properties (UK) Limited | Real estate | 2006 |
| LS Property Training Ltd | Administrative & support | 2025 |
| LSD Autos and Recovery Ltd | Wholesale & retail | 2025 |
| LSE Motors Limited | Manufacturing | 1896 |
| LSG Creative Ltd | Manufacturing | 2013 |
| Lsgm Ltd | Real estate | 2026 |
| LSM 76 Limited | Administrative & support | 2013 |
| LSM Enterprises Ltd | Hospitality | 2023 |
| LSW Care Solutions Ltd | Public administration | 2020 |
| Ltax Academy Ltd | Extraterritorial | 2011 |