| Lawrence Moorings RTM Company Ltd | Households | 2016 |
| LD James Ltd | Construction | 2024 |
| Lear Roofing Limited | Construction | 2018 |
| Level Fencing & Paving Ltd | Administrative & support | 2023 |
| Leverton Bros Developments Limited | Construction | 2024 |
| Leverton Bros Ltd | Other services | 2017 |
| Levett Consultancy Limited | Information & communication | 2009 |
| Levett Group Ltd | Financial services | 2024 |
| Levine Mortgages Limited | Financial services | 2014 |
| Liberty Wealth Management Limited | Financial services | 1999 |
| Life Law Living Limited | Information & communication | 2020 |
| Limelite Limited | Wholesale & retail | 2017 |
| Little Bear's Care Group Limited | Professional & scientific | 2023 |
| Little Bear's Daycare Holdco 1 Limited | Financial services | 2024 |
| Little Doves Christian PRE School Ltd | Public administration | 2017 |
| Little Learners PRE School & Happy Holiday Hub Ltd | Education | 2022 |
| Little Waltham (Stratstone) Ltd | Professional & scientific | 2026 |
| Live Connection Theatre Limited | Arts & recreation | 2018 |
| Lloyds Independent Financial Planning Ltd | Financial services | 2004 |
| Lmac Building Services Limited | Extraterritorial | 2024 |
| Lmac Developments Limited | Construction | 2024 |
| Lmac Eco Systems Limited | Construction | 2021 |
| Lmac Fire Systems Limited | Construction | 2017 |
| Lmac Group Holdings Limited | Extraterritorial | 2015 |
| Lmac Group Limited | Construction | 2007 |
| Lmac Mechanical & Electrical Ltd | Construction | 2020 |
| Lmac Trustee Limited | Professional & scientific | 2024 |
| Locksville Technology Limited | Information & communication | 2014 |
| Londen Services Ltd | Construction | 2023 |
| London and Essex Drainage Ltd | Water & waste | 2016 |
| London Drainage Facilities Limited | Construction | 2005 |
| London Hoist Limited | Manufacturing | 1986 |
| London Protection Limited | Administrative & support | 2025 |
| London River Cruises Ltd | Transport & logistics | 2006 |
| London Sales Ltd | Wholesale & retail | 2024 |
| Loptions Ltd | Administrative & support | 2024 |
| Lost Boys INK Ltd | Information & communication | 2022 |
| Lotts for YOU Limited | Wholesale & retail | 2025 |
| Loughton Pre-School Ltd | Education | 2025 |
| Louisam Limited | Real estate | 2020 |
| Lrpb Media Limited | Other services | 2023 |
| Lucidation Ltd | Professional & scientific | 2014 |
| Lucy Business Bespoke Limited | Administrative & support | 2024 |
| Lunds Limited | Professional & scientific | 2019 |
| Luria Media Limited | Information & communication | 2014 |
| Lynch Insulation Limited | Construction | 2004 |
| M a Ebsworth Limited | Professional & scientific | 2001 |
| M a Security Systems Limited | Construction | 2013 |
| M B Laidlaw Services Ltd | Information & communication | 2019 |
| M R F Plumbing Limited | Professional & scientific | 2006 |
| M R F Mechanical Services Limited | Construction | 1997 |
| M&M Amusements Ltd | Arts & recreation | 2024 |
| Mabhooh Limited | Health & social care | 2025 |
| Maco (Wholesale) Ltd | Wholesale & retail | 2010 |
| Maco Trading Ltd | Wholesale & retail | 2022 |
| MAE Rose Photography Limited | Professional & scientific | 2025 |
| Magpies Consultancy Limited | Extraterritorial | 2015 |
| Makingways Group Limited | Health & social care | 2020 |
| Management (LO) Limited | Other services | 2022 |
| Manhattan Homes Limited | | 1988 |
| Mann Cars Limited | Wholesale & retail | 2024 |
| Mannys Marquees Limited | Arts & recreation | 2008 |
| Maplewood Testing Limited | Extraterritorial | 2019 |
| Marchem Down Limited | Other services | 2017 |
| Marchside Residents Limited | Households | 1985 |
| Marden ASH Mews (Residents) Limited | Professional & scientific | 1974 |
| Marh Properties Limited | Real estate | 2022 |
| Marketing & Trade Options Ltd | Wholesale & retail | 2025 |
| Mars Property Limited | Real estate | 2016 |
| Mask Construction Limited | Construction | 2011 |
| Mask Property Services Limited | Real estate | 2017 |
| Mastertrack Audio Productions Limited | Information & communication | 2025 |
| Match Coatings Limited | Manufacturing | 2006 |
| Matrix Pro Limited | Information & communication | 2009 |
| Matteo Maritati Hospitality Ltd | Administrative & support | 2026 |
| MAX Vehicle Security Limited | Wholesale & retail | 2017 |
| Maxx Contracts Ltd | Construction | 2020 |
| Maybush Construction Ltd | Construction | 2019 |
| MB Plumbing and Building Ltd | Construction | 2018 |
| MBK Plumbing & Heating Limited | Construction | 2005 |
| MD Venue Finding Ltd | Professional & scientific | 2024 |
| Meadows Colour Ltd | Information & communication | 2021 |
| Meeking Electrical Limited | Construction | 2017 |
| MES Associates Ltd | Professional & scientific | 2007 |
| Metelec Engineering Limited | Construction | 1977 |
| Metson & Metson Ltd. | Administrative & support | 2021 |
| MGC Management Limited | Construction | 2024 |
| MGS Kent Limited | Administrative & support | 2014 |
| MHCOACHING1 Limited | Other services | 2025 |
| Midnite Follies Orchestra Ltd | Arts & recreation | 2022 |
| Millar Europe Limited | Other services | 1998 |
| Mirazol Ltd | Information & communication | 2022 |
| Mirazol Properties Ltd | Real estate | 2023 |
| Misty Glaze Ltd | Other services | 2015 |
| Mitchells Academy Limited | Other services | 2020 |
| MJ Glazing Repairs Limited | Other services | 2011 |
| MJK Property Developments Limited | Real estate | 2009 |
| MK1 Indigo Group Limited | Financial services | 2023 |
| MK1 Scaffolding Limited | Construction | 2015 |
| Mobius Group (EOT) Limited | Professional & scientific | 2023 |