| THE I AM Corporation Limited | Administrative & support | 1999 |
| THE Ibiza Times Ltd | Administrative & support | 2024 |
| THE Icon Modelling Academy Ltd | Education | 2026 |
| THE Immigrant Doctor Hub Limited | Health & social care | 2024 |
| THE Independent Recruiter Ltd | Administrative & support | 2025 |
| THE Indian Spoon Limited | Wholesale & retail | 2022 |
| THE Indie Barn Ltd | Wholesale & retail | 2017 |
| THE Indie Scene Ltd | Arts & recreation | 2025 |
| THE Inhale Club Ltd | Wholesale & retail | 2026 |
| THE International Centre for Crowd Management & Security Studies Ltd | Education | 2015 |
| THE Irish Draught Horse Society (Great Britain) | Other services | 2000 |
| THE Iron Works Tattoo Studio Limited | Other services | 2024 |
| THE IT Cabin Limited | Information & communication | 2017 |
| THE JET Recording Company Limited | Other services | 1990 |
| THE JET Republic Limited | Information & communication | 2008 |
| THE Jobs Network Limited | Administrative & support | 2009 |
| THE Johnners Trust | Health & social care | 1994 |
| THE Joint Insolvency Examination Board | Education | 1989 |
| THE Jorja Emerson Centre Ltd | Health & social care | 2023 |
| THE Kaboo Club Ltd | Wholesale & retail | 2025 |
| THE Kitchen Door Store Ltd | Wholesale & retail | 2022 |
| THE Knife Sharpener GUY Limited | Wholesale & retail | 2013 |
| THE Knob Advisory House Limited | Professional & scientific | 2024 |
| THE Knoll Management Limited | Households | 1988 |
| THE Kurofa Brothers (TKB) Ltd | Real estate | 2023 |
| THE LAB Parkour & Freerunning Academy CIC | Education | 2025 |
| THE Ladybarber's Shop Ltd | Other services | 2026 |
| THE Landscape Gardener Limited | Administrative & support | 2009 |
| THE Landscape Group (E.D) Ltd | Administrative & support | 2018 |
| THE Lantern Initiative CIC | Health & social care | 2021 |
| THE Laolu Effect Ltd | Manufacturing | 2024 |
| THE Latimore Investment Company Limited | Real estate | 2020 |
| THE Launchdeep Company Limited | Wholesale & retail | 2020 |
| THE Lawrence Medical Services Ltd | Health & social care | 2023 |
| THE Learning Effect Limited | Professional & scientific | 2019 |
| THE Legatus Services Ltd | Administrative & support | 2025 |
| THE Leopard Room Limited | Professional & scientific | 2025 |
| THE Lettings Grid Ltd | Professional & scientific | 2025 |
| THE Light Cleaning Solutions Limited | Administrative & support | 2024 |
| THE Linwood Kitchen Design Company LLP | | 2007 |
| THE Lion Hotel-Ih Limited | Hospitality | 2018 |
| THE Little Bride Limited | Wholesale & retail | 2018 |
| THE Little Van Company Ltd | Hospitality | 2017 |
| THE Living Archive Project | Arts & recreation | 1993 |
| THE Local Ladies Club Ltd | Administrative & support | 2025 |
| THE Locum Consultancy Limited | Extraterritorial | 2002 |
| THE Loftboarding Brothers Ltd | Construction | 2025 |
| THE Logos Family Church Limited | Information & communication | 2015 |
| THE London Bell Foundry Limited | Manufacturing | 2020 |
| THE London Product & Services Company Ltd | Information & communication | 2016 |
| THE Lord Collective Ltd | Financial services | 2025 |
| THE Lounge From the Hatch Limited | Hospitality | 2026 |
| THE Lounge Hair & Beauty Limited | Other services | 2025 |
| THE LSA Property Company Limited | Real estate | 2014 |
| THE Luminous Woman Limited | Professional & scientific | 2025 |
| THE Lunar Practice Limited | Wholesale & retail | 2026 |
| THE Luxury Agency Ltd | Administrative & support | 2024 |
| THE Mailing Room (MK) Limited | Administrative & support | 2009 |
| THE MAN Cave MHC C.I.C. | Health & social care | 2023 |
| THE Mango Tree IK Limited | Transport & logistics | 2021 |
| THE March Perspective Limited | Hospitality | 2013 |
| THE Marsden Consultancy Ltd | Administrative & support | 2025 |
| THE Mats M.K Ltd | Hospitality | 2022 |
| THE Mauve Design Global Limited | Manufacturing | 2018 |
| THE Mcdonald Partnership Limited | Construction | 2004 |
| THE Meadowdale Group Limited | Professional & scientific | 2025 |
| THE Meadows Montessori School Limited | Education | 2008 |
| THE Mediation People Limited | Other services | 2025 |
| THE Mega Outlet Ltd | Wholesale & retail | 2016 |
| THE Men's Locker Room Ltd | Wholesale & retail | 2026 |
| THE Mentoring LAB Training and Development Ltd | Information & communication | 2017 |
| THE Merchandise Design Company Limited | Manufacturing | 1996 |
| THE Metanos Group Limited | Other services | 2016 |
| THE Middle Ground Calverton Company Limited | Financial services | 2019 |
| THE Mighty One Hundred Limited | Arts & recreation | 2017 |
| THE Military Union Limited | Financial services | 2022 |
| THE Mill DAM Rotherham Ltd | Hospitality | 2023 |
| THE Milton Keynes Melting POT CIC | Hospitality | 2024 |
| THE Mindful Haven Limited | Health & social care | 2025 |
| THE Minimal Fabric Club Limited | Wholesale & retail | 2026 |
| THE Mistry POT Limited | Extraterritorial | 2020 |
| THE Mistry Umbrella Limited | Real estate | 2020 |
| THE MK Hub Developments Limited | Professional & scientific | 2021 |
| THE MK Melting POT | Health & social care | 2014 |
| THE Mobile Tyre Service (Milton Keynes) Ltd | Wholesale & retail | 2019 |
| THE Morning Linen Ltd | Manufacturing | 2025 |
| THE Mortgage Office Ltd | Financial services | 2012 |
| THE Moss Project Ltd | Professional & scientific | 2025 |
| THE Mother’S Gift Innovative Ltd. Ltd | Wholesale & retail | 2025 |
| THE Motivated Type Ltd | Wholesale & retail | 2017 |
| THE Motivation Charitable Trust | Health & social care | 2000 |
| THE Motor and Parts Shop Limited | Transport & logistics | 2015 |
| THE MTS Services Group Limited | Other services | 2005 |
| THE Muse Estate Management Company Limited | Real estate | 2024 |
| THE Museum Workshop Limited | Manufacturing | 2015 |
| THE Natine Solutions Ltd | Construction | 2008 |
| THE National Association for Gifted Children | Health & social care | 1967 |
| THE National Careline Limited | Health & social care | 2018 |
| THE National Energy Foundation | Professional & scientific | 1988 |
| THE National Museum of Computing | Education | 2005 |