| Kate Drysdale Limited | Information & communication | 2010 |
| Kate Wilkins Lighting Designers Limited | Professional & scientific | 2007 |
| KB Coaches Limited | Transport & logistics | 2016 |
| KCA Commercial Cleaning Limited | Administrative & support | 2024 |
| Keepers Cars Ltd | Wholesale & retail | 2013 |
| Kellits Limited | Real estate | 2024 |
| Kelsey Giftware Limited | Extraterritorial | 1963 |
| Kemblewick Limited | Construction | 2014 |
| Kemblewood Homes Limited | Administrative & support | 2007 |
| Kemblewood One Limited | Construction | 2014 |
| Kenneth M Greener Ltd. | Professional & scientific | 2002 |
| King of Cars Ltd | Wholesale & retail | 2008 |
| Kingdom Media Ltd | Professional & scientific | 2024 |
| Kinky Chicken Ltd | Wholesale & retail | 2020 |
| Kinta and Co Ltd | Professional & scientific | 2024 |
| Kitchen Cube Ltd | Other services | 2025 |
| Klink London Limited | Wholesale & retail | 2025 |
| KLR Accounts Ltd | Professional & scientific | 2011 |
| Kobilon Ltd | Information & communication | 2017 |
| Kolavas Limited | Hospitality | 2018 |
| Kore Cloud Limited | Information & communication | 2018 |
| KP Venture Limited | Administrative & support | 2009 |
| Krate Storage Limited | Real estate | 2024 |
| Krazy K9'S Limited | Professional & scientific | 2003 |
| Kryptosec Ltd | Professional & scientific | 2001 |
| Kyatech Ltd | Professional & scientific | 2022 |
| Kyloe (Holdings) Limited | Financial services | 2023 |
| L&L Bespoke Builders Ltd | Construction | 2024 |
| L.F.Dangerfield(Bakery)Limited | Manufacturing | 1960 |
| LA Campagna Stonehouse Limited | Hospitality | 2017 |
| Lady Clare Group Limited | Professional & scientific | 1999 |
| Lamindb Limited | Transport & logistics | 2019 |
| Landwell Ltd | Construction | 2018 |
| Larchstead Limited | Professional & scientific | 2022 |
| Larkhill Property Management Ltd | Real estate | 2018 |
| Last Mile Connections Limited | Financial services | 2020 |
| Last Mile D&B (Midlands & South) Limited | Construction | 2007 |
| Last Mile Heat Limited | Financial services | 2021 |
| Last Mile Infrastructure (Holdings) Limited | Financial services | 2018 |
| Last Mile Infrastructure Group Limited | Financial services | 2018 |
| Last Mile Infrastructure HOLDCO1 Limited | Financial services | 2018 |
| Last Mile Infrastructure HOLDCO2 Limited | Financial services | 2018 |
| Lavender Bakehouse Ltd | Hospitality | 2014 |
| Lavender Bakery and Catering Company Ltd | Manufacturing | 2019 |
| Layerfound Limited | Professional & scientific | 2026 |
| LC Print Co Ltd | Education | 2024 |
| Leanne Thompson School of Dance Ltd | Arts & recreation | 2016 |
| Learning Enablers Limited | Education | 2011 |
| Learning Together Limited | Health & social care | 2004 |
| LED Flex Holdings Limited | Wholesale & retail | 2025 |
| LED Flex Limited | Manufacturing | 2013 |
| Leeper Prosser Solicitors Ltd | Professional & scientific | 2011 |
| Leisure Support Ltd | Construction | 2025 |
| Leysfield Road Management Company Limited | Real estate | 2019 |
| LG Education Management Solutions Ltd | Professional & scientific | 2024 |
| Light Work Renewables Limited | Construction | 2023 |
| Lines Construction Limited | Construction | 2018 |
| Linx Insurance Solutions Limited | Financial services | 2015 |
| Lister IT Services Limited | Information & communication | 2001 |
| LIV Elizabeth Costume Limited | Professional & scientific | 2024 |
| Live Hotkey Leads Limited | Administrative & support | 2025 |
| Lizzie Mabley Ltd | Wholesale & retail | 2026 |
| Ljsj Solutions Limited | Administrative & support | 2019 |
| Llewellyn Davis & SON Limited | Administrative & support | 2016 |
| Llwyn Derw Battery Storage Limited | Energy | 2022 |
| Lmrd Holdings Ltd | Financial services | 2021 |
| Lmrd Property Ltd | Real estate | 2022 |
| Loader & Sons Ltd | Other services | 2025 |
| Logistics in Partnership Limited | Professional & scientific | 2012 |
| Longhorn Pubs Limited | Hospitality | 2019 |
| LOU Will DO IT Ltd | Administrative & support | 2025 |
| Love Bookings Limited | Administrative & support | 2020 |
| LRF Heating & Building Limited | Construction | 2018 |
| Lrtmc Limited | Households | 2001 |
| Lscj Beauty & Aesthetics Ltd | Other services | 2024 |
| LSJ Investments Limited | Manufacturing | 2014 |
| Lucere Candles Ltd | Manufacturing | 2025 |
| Lucie Walsh Ltd | Wholesale & retail | 2015 |
| Lucky Bear Chef Ltd | Hospitality | 2020 |
| Luke & Philip Thomson Taxi's Ltd | Transport & logistics | 2018 |
| Lumina Solutions Ltd | Wholesale & retail | 2025 |
| Lumon Group Limited | Manufacturing | 2025 |
| M B Industrial Limited | Administrative & support | 2005 |
| M D L Kelex Ltd | Manufacturing | 1991 |
| M D Williams Transport Limited | Transport & logistics | 2009 |
| M L Homes (Cheltenham) Limited | Construction | 2005 |
| M&Ge Enterprises Limited | Administrative & support | 2022 |
| M&N Electrical Services Ltd | Construction | 2022 |
| M.R.G. Systems Limited | Manufacturing | 1983 |
| M2 Holdings South West Limited | Financial services | 2026 |
| M4 Property Solutions Limited | Administrative & support | 2011 |
| Mafco Maritime Facilities Company (UK) Limited | Transport & logistics | 1977 |
| Mainstream Digital Limited | Information & communication | 1992 |
| Mainstream Property Investments Ltd | Real estate | 2024 |
| Malcolm Webb Associates Limited | Professional & scientific | 2017 |
| Malvern Brickwork Ltd | Construction | 2023 |
| Manor Farm Estates Limited | Real estate | 1999 |
| Maria Giub Properties Ltd | Real estate | 2023 |
| Market Dojo Ltd | Information & communication | 2010 |
| Market Management Solutions Limited | Wholesale & retail | 2015 |