| LA Cook Shop (Blagdon) Limited | Wholesale & retail | 2014 |
| LA Fleur Malissa Alexander Limited | Manufacturing | 2022 |
| LA Gamba Bar Ltd | Hospitality | 2022 |
| LA Hand Surgery Ltd | Health & social care | 2025 |
| LA Luxe Tanning Co Ltd | Other services | 2023 |
| LA PUB Company Ltd | Hospitality | 2026 |
| LA Roofing & Cladding Limited | Construction | 2018 |
| LA Sagesse Property Ltd | Real estate | 2020 |
| LA Santé Neurologique Ltd | Health & social care | 2022 |
| Lab-Grown Leather Limited | Professional & scientific | 2024 |
| Labour Party Nominees Limited | Real estate | 1969 |
| Labour Party Properties Limited | Real estate | 1969 |
| Labs Consulting Ltd | Information & communication | 2021 |
| Laburnum Mews Limited | Extraterritorial | 2021 |
| Labxcell Limited | Health & social care | 2004 |
| Lacosteross Limited | Construction | 2023 |
| Ladhar Betting & Gaming Ltd | Extraterritorial | 2002 |
| Ladhar Developments LLP | | 2007 |
| Ladhar Nightclubs Limited | Extraterritorial | 2009 |
| Ladislav Kondas Ltd | Transport & logistics | 2026 |
| Lady Liberty Holdings Limited | Wholesale & retail | 2016 |
| Lafara Ltd | Hospitality | 2025 |
| Laff Ltd | Information & communication | 2021 |
| Lahai-Roi Limited | Health & social care | 2023 |
| Lahinnavrin Services Ltd | Information & communication | 2015 |
| LAI 46 Limited | Hospitality | 2013 |
| Laidler and Sons Bricklaying Services Ltd | Construction | 2024 |
| Laila Ahmad Ltd | Health & social care | 2014 |
| Laing O Rourke Construction Group PTY Ltd | Financial services | 2025 |
| Laings Boxing Limited | Arts & recreation | 2024 |
| Laiyee & Wallace Limited | Real estate | 2023 |
| Lake District Leisure Pursuits Limited | Hospitality | 1956 |
| Lake Industrial Rope Access Ltd | Manufacturing | 2025 |
| Lakeland Medical Holdings Limited | Health & social care | 2021 |
| Lakes Enterprises Limited | Financial services | 2025 |
| Lakeshore Flat Management Co. Ltd. | Households | 1997 |
| Lakeside House Properties Limited | Real estate | 2024 |
| Lakeside Supported Living CIC | Health & social care | 2025 |
| Lakhani Properties Limited | Real estate | 2019 |
| Lakso Ltd | Wholesale & retail | 2025 |
| Lala Lettings Ltd | Real estate | 2022 |
| Lala Property Developments Limited | Construction | 2020 |
| Lally Property Limited | Real estate | 1986 |
| Lalo Holdings Ltd | Real estate | 2025 |
| LAM & HO Ltd | Hospitality | 2018 |
| LAM Lettings Limited | Real estate | 2008 |
| LAM TCG Ltd | Wholesale & retail | 2025 |
| Lamasatech Ltd | Manufacturing | 2009 |
| Lamb & Associates Independent Financial Planning Limited | Financial services | 1993 |
| Lambert Merson Consulting Limited | Professional & scientific | 2007 |
| Lambert NE Ltd | Wholesale & retail | 2019 |
| Lambeth Regeneration LLP | | 2019 |
| Lambton Arms Ltd | Hospitality | 2025 |
| Lambton Estate Management Company Limited | Real estate | 2010 |
| Lambton Road Property Limited | Households | 1982 |
| Lambton Share Property Company Limited | Real estate | 2012 |
| Lamesley Farm Ltd | Agriculture & fishing | 2023 |
| Laminform Holdings Limited | Real estate | 1988 |
| Lana Immy Barbers Ltd | Other services | 2023 |
| Lancaster Park Investments North East Ltd | Real estate | 2017 |
| Lancaster Stores NE Limited | Wholesale & retail | 2014 |
| Land Services Northeast Ltd | Agriculture & fishing | 2025 |
| Landis Williamson Holdings Ltd | Real estate | 2025 |
| Landkind Environmental Ltd | Professional & scientific | 2025 |
| Landlord Property Management Ltd | Real estate | 2025 |
| Landmark Country Estates Limited | Construction | 2002 |
| Lands Construction (North East) Limited | Construction | 2013 |
| Landscape 35 Limited | Construction | 2018 |
| Laneberg Wine Ltd | Manufacturing | 2017 |
| Lanes & Co Group Limited | Other services | 2022 |
| Lanesborough Court Freehold Limited | Real estate | 2013 |
| Lanesborough Court Limited | Real estate | 2000 |
| Laneway Wholesale Limited | Wholesale & retail | 2026 |
| Lang and GAN Limited | Real estate | 2020 |
| Langan Developments Ltd | Construction | 2018 |
| Langdale Consultants Limited | Real estate | 2000 |
| Langdale Pavey Holdings Limited | Financial services | 2024 |
| Langdale Residential Limited | Real estate | 2026 |
| Langham Gate Management Company Ltd | Households | 2017 |
| Langley Partners Limited | Real estate | 2024 |
| Langley Propco Ltd | Real estate | 2023 |
| Langley View (Durham) Management Company Limited | Real estate | 2009 |
| Lanmere Construction Limited | Construction | 2026 |
| Lanmere Properties Limited | Real estate | 2024 |
| Lannock Manor Mental Health Limited | Health & social care | 2014 |
| Lannyxstudio Limited | Manufacturing | 2025 |
| Lansbrook Management Limited | Households | 1992 |
| Lansbury Property Ltd | Real estate | 2024 |
| Lansdowne 201 Limited | Health & social care | 2018 |
| Lansdowne Clinic Ltd | Other services | 2008 |
| Lantern Building Consultancy Limited | Professional & scientific | 2021 |
| LAP Legal Consultants Limited | Professional & scientific | 2023 |
| Laptop and Mobile Hub Limited | Other services | 2017 |
| LAR Consulting Ltd | Real estate | 2012 |
| LAR Services PMC Ltd | Other services | 2020 |
| Larafricfoods Ltd | Wholesale & retail | 2026 |
| Larkwave Group Ltd | Other services | 2025 |
| Larned Trysidange Ltd | Wholesale & retail | 2025 |
| Laroc RE - Newcastle Limited | Real estate | 2023 |
| Larrabeauty Ltd | Other services | 2025 |