| Llanstephan (Dawlish Road) Management Limited | Households | 1981 |
| LM Power Tools Ltd | Wholesale & retail | 2019 |
| Loachbrook Meadow (Congleton) Management Company Limited | Households | 2014 |
| Loader's Garage Limited | Wholesale & retail | 1946 |
| Loddon Park (Woodley) Management Company Limited | Households | 2012 |
| Lodgemills Limited | Households | 1988 |
| Londinium Way Management Company Limited | Households | 2012 |
| London & Southern Estates (Weybridge) Limited | Real estate | 2012 |
| London and Southern Estates (City) Ltd | Real estate | 2010 |
| London and Southern Estates (Reading) Ltd | Real estate | 2009 |
| London and Southern Estates (Retail) Ltd | Real estate | 2016 |
| London and Southern Estates (Swindon) Limited | Construction | 2002 |
| London and Southern Estates Limited | Professional & scientific | 2001 |
| Longcross Business Park Estate Management Company Limited | Households | 2019 |
| Longcross Sangs Management Company Limited | Real estate | 2016 |
| Longfield Court (Letchworth)Residents Association Limited | Households | 1971 |
| Longford Coachworks Limited | Manufacturing | 2016 |
| Longhurst Park Residents Management Company Limited | Households | 2017 |
| Longmeadow Walk (Corby) Management Company Limited | Households | 2010 |
| Longrise Limited | Construction | 1980 |
| Longwood Fields (Melton) Management Company Limited | Real estate | 2017 |
| Lothair Property Management Company Limited | Households | 2011 |
| Lottery Fundraising Services Ltd | Administrative & support | 2013 |
| Lottie Hutchins PR Limited | Professional & scientific | 2023 |
| Love & Willow Ltd | Real estate | 2025 |
| Love Orchids Limited | Wholesale & retail | 2025 |
| Lovering Fields (Carclaze) Amenity Areas Management Company Limited | Households | 2010 |
| Lovering Fields (Carclaze) Management Company Limited | Households | 2011 |
| Lovering Fields Management Company Limited | Households | 2004 |
| Lower Green Field Management Company Limited | Households | 2019 |
| Lower Stondon Management Company Ltd | Households | 2018 |
| LS Debt Capital Markets Limited | Professional & scientific | 2021 |
| LS Estates Asset Management Limited | Real estate | 2017 |
| LS Estates Capital Limited | Extraterritorial | 2016 |
| LS Estates Development Limited | Construction | 2017 |
| LS Estates Limited | Construction | 2013 |
| LSB Electrical Limited | Construction | 2015 |
| LSB Renewable Energy Ltd | Construction | 2025 |
| Lucerne Fields (Ivybridge) Management Company Limited | Real estate | 2017 |
| Ludlow Green Management Company Limited | Households | 2020 |
| Luma AV Limited | Construction | 2025 |
| Luminous Yacht Crew Ltd | Administrative & support | 2026 |
| Luminous Yachting Ltd | Transport & logistics | 2023 |
| Lunacon Ltd | Other services | 2019 |
| Lyme View (Holcombe) Management Company Limited | Households | 2019 |
| Lymington and Milford Taxis Limited | Transport & logistics | 2024 |
| Lymington Construction Limited | Construction | 2019 |
| Lyndhurst Landscaping & Maintenance Limited | Administrative & support | 2020 |
| Lyndon Park (Great Harwood) Management Company Limited | Households | 2017 |
| Lysander Fields Management Company Limited | Real estate | 2020 |
| Lysis Technologies Ltd | Manufacturing | 2011 |
| Lythalls Lane (Coventry) Management Company Limited | Households | 2015 |
| M & B Solutions Limited | Real estate | 2007 |
| M & R Transport UK Limited | Transport & logistics | 2006 |
| M a a Accountancy Services Limited | Professional & scientific | 2013 |
| M C Lifting Solutions Limited | Construction | 2014 |
| M&A ENT Ltd | Wholesale & retail | 2024 |
| M. Bennett Developments Ltd | Real estate | 2015 |
| M2OC Limited | Real estate | 2021 |
| Mabena LEA Management Company Limited | Households | 2010 |
| Machido Limited | Administrative & support | 2014 |
| Madeline Holdings Ltd | Real estate | 2021 |
| Madison Place (Staverton) Management Company Limited | Households | 2004 |
| Maestro Broadcasting Ltd | Information & communication | 2020 |
| Maggie’S Lymington Ltd | Wholesale & retail | 2025 |
| Magic Pictures Ltd | Arts & recreation | 2018 |
| Magnolia Court (New Milton) Management Co Ltd. | Households | 2008 |
| Maguire Boats Limited | Manufacturing | 2015 |
| Mahadeva Stores Limited | Professional & scientific | 2026 |
| Mahalo Design Studio Ltd | Professional & scientific | 2024 |
| Mallard Quarter (Grantham) Management Company Limited | Households | 2008 |
| Mallards Reach (Porthcawl) Management Company Limited | Households | 2014 |
| Malvern Vale (Malvern) Management Company Limited | Households | 2007 |
| Manderley (Oakwood Court) Management Limited | Households | 1977 |
| Mandeville Park (Aylesbury) Management Company Limited | Households | 2017 |
| Mandrake Consulting Limited | Professional & scientific | 2020 |
| Mangrove Road (Hertford) Management Company Limited | Households | 2021 |
| Manor Apartments (Abbey Road) RTM Company Limited | Real estate | 2021 |
| Manor Chase (Gloucester Road) Tutshill Management Company Limited | Households | 2017 |
| Manor Court (Heavitree) Management Company Limited | Households | 2001 |
| Manor Court (New Milton) Limited | Households | 1985 |
| Manor Drive Management Company Limited | Households | 2014 |
| Manor Farm Barns (Bishops Caundle) Property Management Company Limited | Administrative & support | 2021 |
| Manor Fields (Bishampton) Management Company Limited | Real estate | 2018 |
| Manor House Gate Management Company Limited | Households | 2006 |
| Manor Park (Appleby Magna) Management Company Limited | Households | 2016 |
| Mantell Park (Cuckfield) Management Company Limited | Households | 2013 |
| Maple Grove (Shrivenham) Management Company Limited | Households | 2017 |
| Maple House (Redhill) Management Company Limited | Households | 1997 |
| Maplebrook Mews (Billericay) Management Company Limited | Real estate | 2013 |
| Marchmont Court Residents Company Limited | Households | 2007 |
| Marham Park (Bury ST Edmunds) Management Company Limited | Real estate | 2017 |
| Marina Court (Kingswear) Company Limited | Households | 1991 |
| Marine Court (Barton on Sea) Management Limited | Households | 1968 |
| Marine Lifts UK Ltd | Manufacturing | 2019 |
| Marine Muscle Ltd | Education | 2025 |
| Marine Point Limited | Households | 1995 |
| Marine View (Teignmouth) Management Company Limited | Households | 2012 |
| Mark Rookes Limited | Manufacturing | 2006 |
| Mark Shinn Limited | Wholesale & retail | 2003 |