| Let's Talk Birth and Baby Limited | Health & social care | 2017 |
| Leuta Vision Limited | Professional & scientific | 2016 |
| Level Acoustic Design Limited | Professional & scientific | 2014 |
| Lewis Security Limited | Administrative & support | 2022 |
| LEX 42 Ltd | Administrative & support | 2016 |
| LEX Secretaries Limited | Professional & scientific | 2004 |
| Leydene Glass and Glazing Limited | Construction | 2011 |
| Leydene House Management Company Limited | Households | 1997 |
| Leydene Park Management Company Limited | Real estate | 1996 |
| LFB Business Consulting Ltd. | Professional & scientific | 2013 |
| Liddo Limited | Information & communication | 2015 |
| Life of Crime Limited | Information & communication | 2012 |
| Ligneous Group Ltd | Construction | 2017 |
| Ligo Consulting Limited | Professional & scientific | 2018 |
| Lillyfields Care Limited | Health & social care | 2014 |
| Limemeek Limited | Professional & scientific | 1982 |
| Lincoln Court, 16 London Road, Liphook Managements Limited | Households | 1993 |
| Lindsay Ventures Limited | Real estate | 2022 |
| Link's Ocarina Youtube Ltd | Arts & recreation | 2021 |
| Lion House Estates Limited | Construction | 2007 |
| LIS Films Limited | Information & communication | 2014 |
| Little Thatch Investments Limited | Professional & scientific | 2005 |
| Littlejohn Bathrooms Limited | Wholesale & retail | 1991 |
| LKG Scientific Ltd | Professional & scientific | 2023 |
| LM Technology Consulting Limited | Information & communication | 2020 |
| Loam Studio Ltd | Arts & recreation | 2018 |
| Local Specialists Ltd | Construction | 2026 |
| Local Treasures Franchising Limited | Other services | 2024 |
| Local Treasures Limited | Other services | 2013 |
| Locality Limited | Information & communication | 2002 |
| Location Facilities Limited | Administrative & support | 2014 |
| Location Landscapes Ltd | Administrative & support | 2013 |
| Lockford Woodworking Limited | Construction | 2022 |
| Locksteep Limited | Real estate | 2007 |
| Logpile.Com Ltd | Wholesale & retail | 2019 |
| London Architecture Ltd | Professional & scientific | 2010 |
| London Original Beauty Co Ltd | Manufacturing | 2015 |
| London Original Property Co Ltd | Real estate | 2022 |
| Longterm Projects Limited | Professional & scientific | 2013 |
| Look-Lively Property Services Ltd | Professional & scientific | 2024 |
| LOS Tamaraos Limited | Arts & recreation | 2008 |
| Louise Cumberland Associates Limited | Other services | 2018 |
| Lounge Inns and Restaurants Limited | Hospitality | 2010 |
| Love Bite Productions Limited | Information & communication | 2011 |
| Love Wine Food Limited | Administrative & support | 2015 |
| Lowe & Co Properties Limited | Real estate | 2014 |
| Loxdale Limited | Extraterritorial | 2002 |
| Loxworth Landscapes Ltd | Administrative & support | 2017 |
| LRB Consult Limited | Professional & scientific | 2017 |
| LRS Mechanical Engineering Limited | Professional & scientific | 2006 |
| LSR Events Limited | Administrative & support | 2025 |
| Lucy Rose Studio Ltd | Wholesale & retail | 2021 |
| Lumora Media Ltd | Administrative & support | 2025 |
| Lunar Associates Limited | Professional & scientific | 2016 |
| Luvelle Skin Ltd | Manufacturing | 2025 |
| Luxfactor Limited | Extraterritorial | 2006 |
| Luxury in the Sun Ltd | Real estate | 2019 |
| Lynchmere House Limited | Households | 2019 |
| Lyons Accounting Ltd | Professional & scientific | 2020 |
| M G Landscapes Limited | Administrative & support | 2011 |
| M J Overton & a S Bassett Limited | Construction | 2003 |
| M J Tosdevine Limited | Agriculture & fishing | 2010 |
| M P L Marketing Services Limited | Professional & scientific | 2006 |
| M Welby Ltd | Agriculture & fishing | 2019 |
| M.Bateman&Son Ltd | Construction | 2023 |
| Macara Services Limited | Construction | 2018 |
| Macdonald Oates LLP | | 2009 |
| Mackarness & Lunt (Building) Limited | Real estate | 2018 |
| Madaxemusic Limited | Arts & recreation | 2017 |
| Madeleine's Kitchen Ltd | Wholesale & retail | 2016 |
| Maenad Technology Limited | Information & communication | 1999 |
| Mafiabikes Limited | Wholesale & retail | 2025 |
| Magenta Compliance Ltd | Other services | 2015 |
| Magenta EGV Limited | Administrative & support | 2017 |
| Magenta Environmental Ltd | Administrative & support | 2024 |
| Magenta Fastpayhotels Limited | Administrative & support | 2018 |
| Magenta Holdco Limited | Administrative & support | 2017 |
| Magenta Holdings Ltd | Public administration | 2025 |
| Magicscreen Ltd | Information & communication | 2007 |
| Mahlerei Investments Ltd | Real estate | 2021 |
| Maigret Productions Limited | Other services | 2014 |
| Main Event Promotions Limited | Wholesale & retail | 2016 |
| Making Miracles Child Care Limited | Real estate | 2005 |
| Mammoth Jams Limited | Arts & recreation | 2020 |
| Managem Marketplace Limited | Information & communication | 2025 |
| Management Design Services Limited | Professional & scientific | 2002 |
| Mandarin Kite Communications 2006 Limited | Professional & scientific | 2005 |
| Mandevco International Ltd. | Administrative & support | 2010 |
| Mannering & Wilson Ltd | Wholesale & retail | 2025 |
| Maple Farm Firewood Limited | Agriculture & fishing | 2024 |
| Marcus Brent-Smith Ltd | Information & communication | 2018 |
| Marden Farms Limited | Extraterritorial | 2012 |
| Marengo Communications Limited | Professional & scientific | 2017 |
| Marinablu International Ltd | Professional & scientific | 2006 |
| Marinablu Properties Limited | Real estate | 2018 |
| Marine Refit & Repair Management Limited | Professional & scientific | 2017 |
| Mark Carson Limited | Information & communication | 2008 |
| Mark Davey Limited | Agriculture & fishing | 1997 |
| Mark Smith Plumbing and Heating Ltd | Construction | 2018 |
| Market Sequence Limited | Professional & scientific | 2013 |