| Longdole Farm Ltd | Agriculture & fishing | 2020 |
| Longfellow Strategic Value UK LP | | 2022 |
| Longfeng Limited | Real estate | 2024 |
| Longhouse Construction Limited | Construction | 2012 |
| Longhurst Properties Limited | Real estate | 2015 |
| Longland Resources Limited | Mining & quarrying | 2016 |
| Longleat Limited | Wholesale & retail | 2016 |
| Longmill Properties Limited | Real estate | 1999 |
| Longmoor Court Management Ltd | Households | 1998 |
| Longrange Holdings Limited | Professional & scientific | 1921 |
| Longreach Scaffolding Services Limited | Construction | 2008 |
| Longshot Studio Ltd | Information & communication | 2025 |
| Longuard Preservations Limited | Wholesale & retail | 1980 |
| Longwave AI Ltd | Administrative & support | 2023 |
| Longwell Carpentry Ltd | Construction | 2018 |
| Longwell Green Community Centre Trading Ltd | Hospitality | 2021 |
| Longwell Green Community Sports Limited | Arts & recreation | 2021 |
| Longwell Green Pre-School Playgroup Limited | Education | 2016 |
| Longwood Associaties Ltd | Extraterritorial | 2019 |
| Longwool Properties Ltd | Real estate | 2021 |
| Lonicera Hairdressing Limited | Other services | 2018 |
| Lons Bi-Folds & Lantern Roofs Limited | Extraterritorial | 2023 |
| Lons Construction Limited | Extraterritorial | 2023 |
| Lons Court Mansion Limited | Households | 1984 |
| Lons Electrical Limited | Extraterritorial | 2023 |
| LONS2024 Ltd | Wholesale & retail | 2024 |
| Lonshiwala Ltd | Real estate | 2018 |
| Lonshiwala Real Estate Ltd | Real estate | 2019 |
| Lonwall Flat Management Company Limited | Households | 1982 |
| Look HER Way Ltd | Extraterritorial | 2021 |
| Look Move Ltd | Extraterritorial | 2011 |
| Look That Ltd | Wholesale & retail | 2025 |
| Look What I DID, MUM Ltd | Arts & recreation | 2025 |
| LOOKING4PARKING Bristol Ltd | Administrative & support | 2019 |
| Loom Digital Ltd | Professional & scientific | 2012 |
| Loom Fusion Limited | Wholesale & retail | 2026 |
| Loonformule Zorg Ltd | Other services | 2021 |
| Loony Lubz Ltd | Wholesale & retail | 2025 |
| Loop Food Safety Consultancy Ltd | Professional & scientific | 2019 |
| Loop Massage Ltd | Other services | 2021 |
| Loop Studio Limited | Arts & recreation | 2013 |
| Loopa Origins Limited | Wholesale & retail | 2014 |
| Loopback Studios Limited | Real estate | 2022 |
| Loopey LOU Ltd | Hospitality | 2021 |
| Loopin Saas Ltd | Information & communication | 2018 |
| Loops Studio Ltd | Wholesale & retail | 2026 |
| Lootbox Self Storage Ltd | Transport & logistics | 2013 |
| Lootbox Storage Ltd | Transport & logistics | 2025 |
| Lopami UK Ltd | Wholesale & retail | 2017 |
| Lopes & Tedeschi Ltd | Hospitality | 2020 |
| Loqbox Savings Limited | Financial services | 2017 |
| Loqbox Technology UK Limited | Information & communication | 2012 |
| Loqbox Trustee UK Limited | Financial services | 2020 |
| LOR Properties Limited | Real estate | 2024 |
| Lora Solar Limited | Energy | 2012 |
| Lorace Flat Management Limited | Households | 2001 |
| Lord Chinedu Limited | Health & social care | 2014 |
| Lord Chinedu Property Ltd | Real estate | 2025 |
| Lord Landscape Limited | Other services | 2018 |
| Lord Ltd | Professional & scientific | 2007 |
| Lords Deliveries Limited | Transport & logistics | 2024 |
| Lords Electrical & Building Services SW Ltd | Manufacturing | 2020 |
| Lords of Lightning Limited | Arts & recreation | 2011 |
| Lordstone Investments Limited | Extraterritorial | 1996 |
| Lore Cleaning Solutions Ltd | Administrative & support | 2019 |
| Lorentech Ltd | Real estate | 2024 |
| Lorentransport Ltd | Transport & logistics | 2026 |
| Lores Studio Ltd | Manufacturing | 2026 |
| Lori Lori Limited | Other services | 2024 |
| Lorien Management Consultancy Limited | Professional & scientific | 2017 |
| Lorne Property Holdings Limited | Households | 2017 |
| Lorraine Freelance PA Limited | Administrative & support | 2023 |
| Lorraine Private Limited | Health & social care | 2013 |
| Lorten Watch Company Limited | Manufacturing | 2017 |
| Lorycol Ltd | Information & communication | 2025 |
| Losaa Investments Ltd | Real estate | 2025 |
| Lost and Grounded Brewers Ltd | Manufacturing | 2015 |
| Lost Chillies Ltd | Hospitality | 2018 |
| Lost Control Limited | Information & communication | 2016 |
| Lost Horizon Coffee Ltd. | Manufacturing | 2019 |
| Lost Horizon Ltd | Information & communication | 2020 |
| Lost in the Reads Ltd | Wholesale & retail | 2025 |
| Lost World Media Ltd | Information & communication | 2019 |
| Lostwood Estates Limited | Real estate | 2018 |
| Lotline Flat Management Company Limited | Households | 1979 |
| Lots of Living Limited | Wholesale & retail | 2012 |
| Lottie Jasmine Designs Ltd | Arts & recreation | 2024 |
| Lotties Vintage Home Ltd | Wholesale & retail | 2014 |
| Lotus Belle Tents Limited | Wholesale & retail | 2014 |
| Lotus Installations Limited | Construction | 2024 |
| Lotus Therapy Services Ltd | Health & social care | 2014 |
| Louback's Garage Ltd | Wholesale & retail | 2021 |
| Loud Hire Ltd | Administrative & support | 2015 |
| Loud Holdings Limited | Real estate | 2017 |
| Loudd Ltd | Information & communication | 2014 |
| Louder Than Love Limited | Financial services | 2019 |
| Louder Voices CIC | Professional & scientific | 2025 |
| Lough Errill Consultancy Services Limited | Professional & scientific | 2014 |
| Loughlin Consulting Limited | Professional & scientific | 2021 |
| Loughor Construction Ltd | Construction | 2019 |