| Lilly Projects Limited | Professional & scientific | 2015 |
| Lilo (London) Limited | Information & communication | 2006 |
| Lily Rose Bungalow Ltd | Health & social care | 2019 |
| Lily's Pads Ltd | Real estate | 2015 |
| Lilyfred Limited | Health & social care | 2023 |
| Lilywhite Services Limited | Information & communication | 2018 |
| Lima Juliett Golf Limited | Administrative & support | 2023 |
| Lime Edge Design Limited | Other services | 2010 |
| Lime Street Advisors Limited | Professional & scientific | 2023 |
| Limelight Asia Limited | Arts & recreation | 2024 |
| Limelight Entertainments (Productions) Limited | Other services | 2001 |
| Limelight Entertainments Limited | Other services | 1992 |
| Limelight Productions Limited | Professional & scientific | 2009 |
| Limelight Property Limited | Real estate | 2009 |
| Limepad Construction Ltd | Construction | 2007 |
| Liminal Cycles Limited | Wholesale & retail | 2024 |
| Liminal Space Psychology Service Ltd | Education | 2022 |
| Limited Company Accountants Limited | Extraterritorial | 2014 |
| Linda Hamilton Catering Limited | Professional & scientific | 2017 |
| Lindneer Limited | Real estate | 2003 |
| Line Interiors Limited | Construction | 2018 |
| Linear Precision Engineers Limited | Professional & scientific | 2001 |
| Linen and Leather Ltd | Wholesale & retail | 2023 |
| Lingaury Company Ltd | Wholesale & retail | 2020 |
| Link Europa Limited | Wholesale & retail | 2015 |
| Linmas Cafe Limited | Hospitality | 2025 |
| Linnell Group Ltd | Construction | 2026 |
| Linnet Mews (Colchester) Management Company Limited | Households | 2007 |
| Linometry Ltd | Information & communication | 2022 |
| Lionas Holdings Ltd | Financial services | 2026 |
| Lionel Surveying Ltd | Construction | 2020 |
| Lions Ridge Management Company Limited | Households | 2005 |
| Liora Lettings Ltd | Real estate | 2025 |
| Liri (UK) Limited | Extraterritorial | 1998 |
| Liri Limited | Extraterritorial | 1998 |
| Liryza Trading Limited | Professional & scientific | 2009 |
| Lisa Mullaly Coaching Ltd | Other services | 2024 |
| Lisalina Ltd | Health & social care | 2013 |
| Little 11 Collective Ltd | Wholesale & retail | 2025 |
| Little Baddow Couriers Limited | Transport & logistics | 2015 |
| Little Baddow Investment Holdings Limited | Real estate | 2015 |
| Little Bloomers Ltd | Health & social care | 2025 |
| Little Doggy Daycare Ltd | Other services | 2025 |
| Little Manor Ltd | Real estate | 2022 |
| Little Owls Nursery Limited | Education | 2004 |
| Little Piggies Ltd | Hospitality | 2019 |
| Little Property Partners Ltd | Real estate | 2023 |
| Little Robins Forest School Ltd | Public administration | 2023 |
| Little Rock Employment Law Ltd | Professional & scientific | 2026 |
| Little Roo's Pet and Country Store Ltd | Wholesale & retail | 2024 |
| Little Smarties Nursery Ltd | Education | 2012 |
| Little Stars Circus Limited | Education | 2016 |
| Little Waltham Preschool CIC | Education | 2014 |
| Little Wheelers Limited | Education | 2015 |
| Littlecroft CM3 RTM Company Limited | Households | 2009 |
| LIV (UK) | Other services | 2010 |
| Live Accommodation Ltd | Real estate | 2025 |
| Live Beyond Therapy Ltd | Health & social care | 2025 |
| Live Media Group Ltd. | Information & communication | 2020 |
| Live Pages Ltd | Professional & scientific | 1998 |
| Live Vibes Ltd | Administrative & support | 2025 |
| Live-In Homes Limited | Construction | 2017 |
| Livelong Hyntle Barn Limited | Health & social care | 2013 |
| Livelong Wellness Limited | Real estate | 2017 |
| Livesites Group Ltd | Administrative & support | 2015 |
| Living Proof Services Ltd | Health & social care | 2024 |
| LIZ Frosticks Swim School Ltd | Arts & recreation | 2014 |
| LIZ Hall Consulting Ltd | Professional & scientific | 2013 |
| Lizard Design Limited | Information & communication | 1997 |
| LJ Academy Ltd | Other services | 2021 |
| Ljbr Holding Ltd | Financial services | 2014 |
| Ljbr Prop Ltd | Real estate | 2016 |
| LJF Investment Management Limited | Real estate | 2011 |
| LJF London Ltd | Arts & recreation | 2019 |
| LJR Engineering Project Services Limited | Construction | 2007 |
| LJS Asset Limited | Wholesale & retail | 2019 |
| LJW Consultants Ltd | Construction | 2025 |
| LKB Fitness Limited | Other services | 2021 |
| LKG Daughters Holdings Limited | Real estate | 2025 |
| LKG Daughters Plumbing & Heating Ltd | Other services | 2006 |
| Lkmn Ltd | Extraterritorial | 2024 |
| LKR Property Holdings Ltd | Real estate | 2021 |
| LL Consultancy Services Ltd | Administrative & support | 2025 |
| LLB Recruitment Ltd | Administrative & support | 2022 |
| LLD Property Holdings Limited | Real estate | 2019 |
| Lleshi Formwork Limited | Construction | 2017 |
| Lloyd Burden Consulting Limited | Professional & scientific | 2026 |
| Llycon K. LLP | | 2007 |
| LM Admin Services Ltd | Administrative & support | 2023 |
| LMC Interiors Limited | Construction | 2014 |
| LMJ Animation Ltd. | Extraterritorial | 2008 |
| LML Administration Services Ltd | Administrative & support | 2025 |
| LMN Bookkeeping Services Ltd | Professional & scientific | 2022 |
| LMN Solutions Limited | Information & communication | 2019 |
| LMT Medical Ltd | Health & social care | 2024 |
| LN Utilities Limited | Energy | 2017 |
| LN Valet Ltd | Wholesale & retail | 2026 |
| LNK Property Developments Limited | Construction | 2016 |
| LNR Fusion Holdings Limited | Financial services | 2026 |
| LNR Fusion Properties Limited | Real estate | 2026 |