| Lightbulb Digital Consulting Ltd | Information & communication | 2016 |
| Lighten Traffic Safety Co., Ltd | Extraterritorial | 2019 |
| Lijiaqi Machinery Trading Co., Ltd | Administrative & support | 2022 |
| LIL Reds Ltd | Administrative & support | 2023 |
| Lilyrose Bridal Boutique Limited | Wholesale & retail | 2013 |
| Limestone Global Limited | Administrative & support | 2022 |
| Ling Invest Ltd | Construction | 2022 |
| LINK2STAFF Ltd | Administrative & support | 2013 |
| Links Sausages Ltd | Hospitality | 2025 |
| Linsheng Package Limited | Administrative & support | 2017 |
| Linvestate Ltd | Construction | 2007 |
| Liquid GAS UK Ltd | Other services | 1970 |
| Lirzzo International Co., Ltd | Administrative & support | 2021 |
| Lisa Mallinson Limited | Professional & scientific | 2018 |
| Lisheng Trading Co., Ltd | Administrative & support | 2025 |
| Litong International Co., Ltd | Professional & scientific | 2015 |
| Litthill Services Ltd | Construction | 2026 |
| Little Cubs Nursery Limited | Health & social care | 2016 |
| Little Himalaya Limited | Other services | 2016 |
| Little Rissington SPV Limited | Construction | 2021 |
| Little Virginia Management Limited | Households | 1976 |
| Lituofeng Trade Co., Limited | Extraterritorial | 2024 |
| Lixing Asia Pactific Co., Limited | Manufacturing | 2024 |
| LKE (UK) Ltd | Wholesale & retail | 2015 |
| Loafy Building Limited | Information & communication | 2022 |
| Lockwood Builders Limited | Construction | 2024 |
| Loftopia Limited | Construction | 2024 |
| Logocaps Limited | Wholesale & retail | 2017 |
| Logotype Limited | Information & communication | 2018 |
| London Suselan Houseware Co., Ltd | Wholesale & retail | 2017 |
| Longbon International Industry Co., Ltd | Extraterritorial | 2016 |
| Longfield Heating & Plumbing Ltd | Construction | 2005 |
| Longhui Industrial Group Co., Ltd | Extraterritorial | 2018 |
| Longrui Machinery Trading Co., Ltd | Administrative & support | 2024 |
| Longtop Supply Chain Co., Ltd | Administrative & support | 2023 |
| Loose Head Properties Limited | Other services | 2024 |
| Lord Design Studio Ltd | Professional & scientific | 2025 |
| Loren Properties Limited | Real estate | 2020 |
| Lotd Alliance Tubing Ltd | Administrative & support | 2016 |
| Lourdes Garden Rooms Ltd | Construction | 2022 |
| Love 4 Pets Emporium Ltd | Wholesale & retail | 2019 |
| Love Broadband Limited | Information & communication | 2021 |
| Love Fusion Ltd | Wholesale & retail | 2019 |
| Love Smart Limited | Wholesale & retail | 2021 |
| Love to Save Energy Limited | Construction | 2019 |
| Lovely Post Ltd | Information & communication | 2013 |
| Lovinlife Ltd | Hospitality | 2023 |
| LOW Brook Aviation Ltd | Education | 2025 |
| Lowell Williams Consulting Ltd | Education | 2019 |
| Lpdc Limited | Manufacturing | 2012 |
| LQF Trading Ltd | Wholesale & retail | 2026 |
| LRH Properties Limited | Professional & scientific | 2012 |
| LSF Trading Limited | Wholesale & retail | 2026 |
| Ltdonline Ltd | Information & communication | 2007 |
| Ltdonline Services Limited | Information & communication | 2025 |
| Ltdonline Support Services Limited | Information & communication | 2026 |
| Lucas Audio&Visual International Limited | Extraterritorial | 2018 |
| Lucinda Soon Limited | Professional & scientific | 2024 |
| Lucre Limited | Professional & scientific | 2008 |
| Ludwig Schneider Investment Management Ltd | Manufacturing | 2021 |
| Luminus (Group) Co., Ltd | Administrative & support | 2019 |
| Lumonics Developments 2 LLP | | 2025 |
| Lumonics Developments LLP | | 2018 |
| LUX Event Styling Ltd | Professional & scientific | 2026 |
| Luxi Chemical (Shandong) Co., Ltd | Administrative & support | 2026 |
| Luxlite Industry Co., Ltd | Extraterritorial | 2010 |
| LX Aviation Limited | Wholesale & retail | 2017 |
| Lynn Hemmings Chiropody Services Limited | Health & social care | 2002 |
| Lyris Studio Limited | Information & communication | 2021 |
| LZ Contracting Limited | Information & communication | 2021 |
| LZY Trading Limited | Wholesale & retail | 2026 |
| M & D Equipment Solutions Ltd | Manufacturing | 2026 |
| M & K Sales Ltd | Real estate | 2024 |
| M & Z Graham Solutions Limited | Professional & scientific | 2013 |
| M Carter Plastering Limited | Construction | 2005 |
| M D Resolutions Ltd | Construction | 2025 |
| M S Johnson Limited | Construction | 2014 |
| M TEC (Warwickshire) Limited | Construction | 1997 |
| M.J.Addis Limited | Information & communication | 2013 |
| M2D2 Engineering Limited | Professional & scientific | 2022 |
| M69 Limited | Information & communication | 2003 |
| Mabs Cross Associates Limited | Information & communication | 1933 |
| Macani Ltd | Professional & scientific | 2024 |
| Macc Construction Ltd | Other services | 2016 |
| Macdonald Flight Training Ltd | Education | 2025 |
| Macdonald Property Rentals Ltd | Real estate | 2018 |
| Mace Air Conditioning Limited | Construction | 2021 |
| Macey SRH Ltd | Health & social care | 2023 |
| Mackenzie Building Services Limited | Construction | 2014 |
| Mackenzie Developments (Warwickshire) Ltd | Real estate | 2015 |
| Mackenzie Miller Developments Limited | Construction | 2015 |
| Maekify Ltd. | Wholesale & retail | 2025 |
| Magical Mini Ltd | Wholesale & retail | 2020 |
| Maguire (Properties) Limited | Real estate | 1963 |
| Maiba Electronic Technology Co., Ltd | Administrative & support | 2023 |
| Maira Consult Ltd | Professional & scientific | 2018 |
| Makanika Ltd | Professional & scientific | 2015 |
| Make My Day Make UP Limited | Professional & scientific | 2016 |
| Makestone Strategic Land Ltd | Real estate | 2020 |
| Malpas Executive Limited | Professional & scientific | 2013 |