| Londata Ltd. | Professional & scientific | 2020 |
| Londinium Construction Limited | Construction | 2018 |
| London & Kent Sedation Ltd | Health & social care | 2024 |
| London Aerons Limited | Wholesale & retail | 2022 |
| London and Chancery Properties Limited | Administrative & support | 1974 |
| London Association of Recovery Operators Limited | Other services | 1997 |
| London Chocolate Fountains Limited | Hospitality | 2005 |
| London Cleaning Firm Ltd | Administrative & support | 2021 |
| London Decore Limited | Hospitality | 2023 |
| London Developments (GB) Limited | Real estate | 2009 |
| London ENT Surgeons LLP | | 2023 |
| London Fire & Engineering Limited | Construction | 2022 |
| London Fire Compliance Ltd | Construction | 2020 |
| London French Polishers Limited | Other services | 2018 |
| London Interventional Radiology Limited | Health & social care | 2010 |
| London Maintenance Services Ltd | Construction | 2004 |
| London Medacademy Ltd | Education | 2025 |
| London Neurology Specialist Ltd | Health & social care | 2026 |
| London Ophthalmology Services Ltd | Health & social care | 2020 |
| London Prestige Care Services Limited | Health & social care | 2020 |
| London Sharp Interiors Ltd | Manufacturing | 2018 |
| London Soap and Chemical Co. Limited | Manufacturing | 1987 |
| London Ventilation Services Limited | Professional & scientific | 2018 |
| London's Calling Worldwide Limited | Arts & recreation | 2017 |
| London's Finest Cleaning Services Ltd | Administrative & support | 2024 |
| Londoncats Limited | Other services | 2015 |
| Londons Finest Taxi Services Limited | Transport & logistics | 2016 |
| London’S Finest Transport Services Ltd | Transport & logistics | 2024 |
| Longacre Estate Agents Limited | Real estate | 2021 |
| Longacre Finance Ltd | Financial services | 2023 |
| Longboat Productions Ltd | Information & communication | 2022 |
| Longbury Residents Association Limited | Other services | 1988 |
| Longfield Systems Limited | Professional & scientific | 2007 |
| Longyu Limited | Real estate | 2021 |
| Lonzim Enterprises Limited | Financial services | 1997 |
| Loominous Ltd | Other services | 2019 |
| Loop Financial Services Limited | Professional & scientific | 2026 |
| Lordofwisdom Ltd | Health & social care | 2022 |
| Lori’S Homes Ltd | Health & social care | 2023 |
| Lorraine Slee Consultancy Ltd | Education | 2022 |
| Lost Dog Pictures Limited | Administrative & support | 2020 |
| Lost Llama UN Limited | Wholesale & retail | 2020 |
| Lotusrose Psychotherapy Limited | Health & social care | 2020 |
| Loughton Mechanical & Electrical Contractors Limited | Construction | 2013 |
| Louise Emma Clarke Limited | Professional & scientific | 2021 |
| Love and Peace Homestay & Cottages Limited | Hospitality | 2023 |
| Love Beyond Limited | Health & social care | 2022 |
| Love of Maths Ltd | Wholesale & retail | 2019 |
| Lovgift Ltd. | Wholesale & retail | 2010 |
| Lovibonds Property Limited | Real estate | 2024 |
| Lowe Building & Roofing Ltd | Construction | 2024 |
| Lower Hook Management Company Limited | Administrative & support | 2008 |
| Lower Hook One Limited | Administrative & support | 2026 |
| Lower Hook Two Limited | Administrative & support | 2026 |
| Lower Hook Workwear Limited | Manufacturing | 2025 |
| Lower Road Allotments Ltd | Arts & recreation | 2019 |
| Lowmara Ltd | Information & communication | 2026 |
| LOX (Rotherfield) Limited | Other services | 2012 |
| Loxodona Group Limited | Administrative & support | 2025 |
| LP FOX Co Limited | Hospitality | 2026 |
| LP SD One Hundred Thirteen Limited | Wholesale & retail | 2023 |
| LPC Housing Limited | Real estate | 2025 |
| LPC Retail Limited | Wholesale & retail | 2016 |
| LPL Design and Build Ltd | Construction | 2018 |
| LPP Clerking Limited | Administrative & support | 2025 |
| LPP Propco 1 Ltd | Real estate | 2018 |
| LPS Plumbing Southeast Ltd | Administrative & support | 2016 |
| LRC Property Investments Limited | Real estate | 2025 |
| LRM Construction Limited | Financial services | 2025 |
| LRM Solutions Limited | Administrative & support | 2015 |
| LS and J Ltd | Health & social care | 2015 |
| LS Flooring Masters Ltd | Construction | 2023 |
| LT Electrical Ltd | Construction | 2025 |
| LTB Clearance & Waste Disposal Ltd | Water & waste | 2024 |
| LTC Holdings Limited | Real estate | 1990 |
| LTC Nominees Limited | Extraterritorial | 2014 |
| LTC Trustees Limited | Professional & scientific | 1998 |
| Lttmk Limited | Professional & scientific | 2015 |
| Luces Assessment Services Ltd | Health & social care | 2026 |
| Lucid Innovate Limited | Professional & scientific | 2019 |
| Lucky M LEO Ltd | Wholesale & retail | 2025 |
| Luckyroobs Limited | Real estate | 2020 |
| Ludo Foundry Ltd | Information & communication | 2026 |
| Luella Gifts Ltd | Wholesale & retail | 2022 |
| LUH Chelms Limited | Other services | 2013 |
| Lulabelle Logistics Ltd | Transport & logistics | 2025 |
| Lullington Garth Limited | Households | 2012 |
| Lulu Lettings Limited | Real estate | 2024 |
| Lulu Property Investments Ltd | Real estate | 2022 |
| Lumi Therapy Ltd | Wholesale & retail | 2020 |
| Lumina Software Ltd | Information & communication | 2024 |
| Lumina Supplies Ltd | Wholesale & retail | 2025 |
| Luminary Consultancy Ltd | Information & communication | 2022 |
| Luna Creative Media Ltd | Information & communication | 2020 |
| Luno Rentals Ltd | Administrative & support | 2025 |
| Luriche Holdings Ltd. | Financial services | 2025 |
| Lush Coaching Ltd | Information & communication | 2014 |
| Lushtag London Ltd | Wholesale & retail | 2024 |
| Luvora Limited | Wholesale & retail | 2024 |
| LUX ET Umbra Consulting Ltd | Professional & scientific | 2022 |