| Lost Track of Time Ltd | Administrative & support | 2021 |
| Loto International Limited | Extraterritorial | 2017 |
| Lottie Clark Tattoo Limited | Other services | 2024 |
| LOU Gant Ltd | Construction | 2026 |
| Loud Investments Limited | Administrative & support | 2009 |
| Lougher Contemporary Ltd | Administrative & support | 2015 |
| Louise's Bar Ltd | Hospitality | 2024 |
| Loukan Limited | Professional & scientific | 2018 |
| Loutech Ltd | Information & communication | 2021 |
| Love Entrepreneurs CIC | Education | 2018 |
| Love Makers Cafe Ltd | Hospitality | 2024 |
| Love Monster Limited | Arts & recreation | 2019 |
| Love Sunday Limited | Other services | 2026 |
| Lovehoney Group Limited | Wholesale & retail | 2006 |
| Lovehoney Group UK Limited | Wholesale & retail | 2003 |
| Loves Hill Court Management Company Limited | Households | 2021 |
| Loveworn Limited | Wholesale & retail | 2023 |
| LOW END Games Ltd | Information & communication | 2019 |
| Lower Bristol Cafe Ltd | Hospitality | 2021 |
| Lower Chatley Lakes Ltd | Administrative & support | 2022 |
| Loxton Land Limited | Other services | 2019 |
| Loxton Surveyors Limited | Professional & scientific | 2019 |
| Loxtopus Consultancy Ltd | Information & communication | 2025 |
| LPT Developments Limited | Construction | 2019 |
| LR Store Limited | Wholesale & retail | 2026 |
| Lrbc Direct Ltd | Wholesale & retail | 2025 |
| LRF Business Limited | Professional & scientific | 2025 |
| LRP Ventures Limited | Real estate | 2026 |
| LS Collective Limited | Wholesale & retail | 2011 |
| LS Nails & Beauty Ltd | Other services | 2026 |
| LS Nails Bar Ltd | Other services | 2024 |
| LS Professional Placements UK Ltd | Administrative & support | 2024 |
| Lseomp Co Ltd | Households | 2024 |
| LT Jones Properties Limited | Real estate | 2018 |
| LTB Aerotech Limited | Manufacturing | 2011 |
| LTC Solutions Ltd | Financial services | 2008 |
| Lubezone Lubrication Systems Limited | Manufacturing | 2021 |
| Lucas & Weston Limited | Professional & scientific | 2004 |
| Lucky Fish Ltd | Information & communication | 2010 |
| Lucky Five Ltd | Information & communication | 2017 |
| Lucky Landings Ltd | Agriculture & fishing | 2024 |
| Luculent Limited | Professional & scientific | 2015 |
| Lucy Cope Limited | Manufacturing | 1999 |
| Lucy Jamieson Ltd | Professional & scientific | 2023 |
| Lucy Miller Nutrition Limited | Health & social care | 2020 |
| Lucy Stehlik Ltd | Professional & scientific | 2022 |
| Luke Evans Fitness Ltd | Arts & recreation | 2019 |
| Lulan Surveying Limited | Professional & scientific | 2025 |
| Lulu MAY Ltd | Real estate | 2024 |
| Luma Electrical Ltd | Construction | 2026 |
| Lumiere Clinical Limited | Health & social care | 2014 |
| Lumiere Lets LLP | | 2025 |
| Lumini Decoration Ltd | Extraterritorial | 2015 |
| Lumini Developments Ltd | Construction | 2014 |
| Lumini Drylining Limited | Construction | 2015 |
| Lumini Lettings Ltd | Real estate | 2019 |
| Luminous Development Ltd | Information & communication | 2014 |
| Lumitok Ltd | Wholesale & retail | 2021 |
| Luna Nova Estates Ltd | Real estate | 2024 |
| Luna Nova Property Ltd | Real estate | 2024 |
| Lunaria Estates Ltd | Real estate | 2025 |
| Lunaris Media Group Ltd | Information & communication | 2022 |
| Lunatrix Design Ltd | Information & communication | 2006 |
| Lunch Delivered Ltd | Hospitality | 2022 |
| Lundy Mortgages Limited | Other services | 2025 |
| Lupusoaks Cattery Limited | Other services | 2024 |
| Lush Digital Limited | Professional & scientific | 2016 |
| Luther Wilson,Limited | Health & social care | 1930 |
| LUX Social Ltd | Information & communication | 2024 |
| Luxico Ventures Limited | Professional & scientific | 2024 |
| Luxury Landscapes (Bath) Limited | Administrative & support | 2021 |
| Luxury Nails (Bath) Ltd | Other services | 2018 |
| Luxury Pink Properties Ltd | Households | 2025 |
| Luxury Property Management Ltd | Households | 2021 |
| LX Trade and Services Ltd | Transport & logistics | 2019 |
| Lyalls Property Developments Limited | Real estate | 2020 |
| Lydia Elif Wright Consulting Ltd | Professional & scientific | 2026 |
| Lydia’S Education Consultancy Ltd | Education | 2023 |
| Lynch & Holroyd Property Ltd | Real estate | 2022 |
| Lyndale Management Company (Bath) Limited | Households | 2001 |
| Lynea Architects Ltd | Professional & scientific | 2020 |
| Lynhall Management Limited | Households | 1978 |
| Lynwood (London) Project Management Ltd | Professional & scientific | 2022 |
| Lyons Neurology Care Limited | Health & social care | 2013 |
| Lypiatt Castings Limited | Arts & recreation | 1983 |
| Lyric Communications Limited | Professional & scientific | 2005 |
| Lyszu Group Limited | Real estate | 2023 |
| LZ Brit Trade Ltd | Wholesale & retail | 2023 |
| LZA Foods Bath Limited | Hospitality | 2025 |
| M & B (Brake Press) Limited | Manufacturing | 1984 |
| M & K Hardware Limited | Wholesale & retail | 2003 |
| M a Grant Holdings Ltd | Financial services | 2019 |
| M a T T H E W B L a C K M O R E Limited | Professional & scientific | 2024 |
| M Bath Ltd | Hospitality | 2019 |
| M G Grainger Limited | Agriculture & fishing | 2003 |
| M G Grier Limited | Real estate | 2007 |
| M J COX Limited | Construction | 2008 |
| M J Griffiths Heating & Plumbing Ltd | Construction | 2024 |
| M J Harwood Plant Hire Limited | Administrative & support | 2011 |
| M J Pearson (SW) Limited | Construction | 2013 |