| Lazer Ninja Limited | Wholesale & retail | 2024 |
| LBH Macclesfield Limited | Real estate | 2019 |
| LBH Properties Management Limited | Households | 2026 |
| LBS (Macc) Limited | Real estate | 2026 |
| LC Trust Management Ltd | Administrative & support | 2020 |
| LCC Consultancy Limited | Education | 2014 |
| LCS Sports Horse Breeding Limited | Agriculture & fishing | 2023 |
| LDF Surface Design Ltd | Construction | 2025 |
| Ldmh Ltd | Extraterritorial | 2011 |
| LE RAY (Wilmslow) Management Company Limited | Households | 2024 |
| LEA Farming | Agriculture & fishing | 2012 |
| Leading Edge Rentals Ltd | Administrative & support | 2025 |
| League of HER Own Ltd | Other services | 2024 |
| Leaseplan Finance (Vehicle Management) Limited | Extraterritorial | 2004 |
| Leather and Loom Ltd | Professional & scientific | 2023 |
| Leather Property Group Ltd | Real estate | 2024 |
| LEE Costello Electrical Contractors Limited | Construction | 2006 |
| LEE Design Studio Limited | Wholesale & retail | 2023 |
| Lee's Coffee & Pastry Corner Ltd | Hospitality | 2025 |
| Leeben Trading Ltd | Education | 2026 |
| Leeds Championship Dog Show Ltd | Other services | 2012 |
| Legal RA Limited | Administrative & support | 2016 |
| Legg & Co Ltd | Professional & scientific | 2002 |
| Legmark Ltd | Information & communication | 2016 |
| Lehvoss UK Limited | Wholesale & retail | 1992 |
| Leigh Ventures Limited | Professional & scientific | 2018 |
| LEN Property Buyer Ltd | Construction | 2009 |
| Lennards Limited | Professional & scientific | 1985 |
| LEO Hair Limited | Wholesale & retail | 2025 |
| Leon & Associated Attorneys at Law Ltd | Professional & scientific | 2022 |
| Letfair Ltd | Information & communication | 2020 |
| Lettie's Catering Ltd | Hospitality | 2021 |
| Leung & Co. Limited | Extraterritorial | 1982 |
| Leveraged Business Solutions Limited | Professional & scientific | 2007 |
| Leveraged Property Developments Limited | Households | 2018 |
| Lewbard Engineering Services Group Ltd | Construction | 2026 |
| Lewis Joinery & Conversions Limited | Construction | 2023 |
| Lewis Land Limited | Construction | 2024 |
| Lewis Music Limited | Arts & recreation | 2026 |
| Lewis Steel Limited | Manufacturing | 2021 |
| Lexington Catering Limited | Administrative & support | 1997 |
| Lexolent Ltd | Professional & scientific | 2022 |
| Lexsam Consultancies Ltd | Agriculture & fishing | 2020 |
| Lexsam Limited | Agriculture & fishing | 2017 |
| Leyland Finance Limited | Financial services | 2009 |
| LF Owners 2018 Limited | Real estate | 2018 |
| LGH Building and Roofing Ltd | Construction | 2023 |
| LGR Electrical Ltd | Construction | 2018 |
| LIA Rutter Limited | Wholesale & retail | 2016 |
| LIA Smith Limited | Wholesale & retail | 2012 |
| Libbys Patch Ltd | Agriculture & fishing | 2021 |
| Libre Campers Ltd | Construction | 2026 |
| Liconic UK Limited | Wholesale & retail | 2008 |
| Liddell Jones Limited | Arts & recreation | 2017 |
| Life Compass Consulting Ltd | Professional & scientific | 2017 |
| Life Sports Media Limited | Information & communication | 2019 |
| Lifeline Direct Ltd | Financial services | 1988 |
| Lifestyle Holidays Limited | Administrative & support | 1999 |
| Lifetime Finance Bureau Limited | Professional & scientific | 2023 |
| Lighting by Design Limited | Wholesale & retail | 1995 |
| Lightning Bolt Fitness Ltd | Arts & recreation | 2025 |
| Lightning Crushers Limited | Extraterritorial | 1991 |
| Lillium Landscapes Ltd | Administrative & support | 2024 |
| Lily & Mortimer Limited | Wholesale & retail | 2017 |
| Lilyville Limited | Construction | 1993 |
| Limeco Management Limited | Households | 1983 |
| Limehurst Investments Limited | Construction | 1999 |
| Limitless Digital Solutions Limited | Professional & scientific | 2023 |
| Limitless Process Reengineering Limited | Professional & scientific | 2018 |
| Linden & IVY Limited | Real estate | 2022 |
| Line ALT Green Flats Management Limited | Households | 2022 |
| Linen Press Suffolk Limited | Other services | 2010 |
| Linkester Engineering Limited | Real estate | 1966 |
| Links Automotive Limited | Wholesale & retail | 2013 |
| Lionlike Limited | Arts & recreation | 1989 |
| Liora AI Limited | Professional & scientific | 2024 |
| Liquid Commerce Holdings Ltd | Wholesale & retail | 2022 |
| Lisa Johnson Ltd | Construction | 2025 |
| Lisle Furniture Limited | Manufacturing | 2000 |
| LIT Solution Group Limited | Construction | 2018 |
| Little Lowe Developments Ltd | Construction | 2025 |
| Little Manly Property Management Ltd | Households | 2025 |
| Little Miss Consulting Limited | Professional & scientific | 2023 |
| Little Nanna Ltd | Real estate | 2025 |
| Little Olive Soft Play Ltd. | Arts & recreation | 2025 |
| Little Wildflowers Childminding Ltd | Health & social care | 2025 |
| Livcoe Ltd | Real estate | 2016 |
| Live Easily Homes Ltd | Real estate | 2025 |
| Live Easily Ltd | Real estate | 2025 |
| Live Media Limited | Professional & scientific | 2025 |
| Liverpool Pizza Limited | Hospitality | 2023 |
| Livewire Campaign Limited | Administrative & support | 2009 |
| Living Gardens Limited | Administrative & support | 1996 |
| Lizas Limited | Health & social care | 2009 |
| Lloyd Taylor Ltd | Professional & scientific | 2023 |
| LMD Ventures Ltd | Other services | 2024 |
| LMF Builders Limited | Construction | 2013 |
| LMS Experts Limited | Professional & scientific | 2021 |
| LMT Asset Management Ltd | Real estate | 2015 |
| LNE Electrical and Plumbing Ltd. | Construction | 2010 |