| Keith Handy Design Limited | Professional & scientific | 1998 |
| Kenilworth Court RTM Company Limited | Households | 2025 |
| Keystone Group Holdings Ltd | Financial services | 2025 |
| Keystone Refurb Services Ltd | Real estate | 2025 |
| Keystone Retail Services Ltd | Construction | 2015 |
| Keystone Staffordshire Ltd | Health & social care | 2023 |
| KGS (Eccleshall) Limited | Manufacturing | 2011 |
| KHD Technology Limited | Manufacturing | 2016 |
| KHR Consultancy Ltd | Professional & scientific | 2021 |
| KID Kreations Group Limited | Wholesale & retail | 2022 |
| KID Kreations Limited | Professional & scientific | 2004 |
| Kiln Maintenance Limited | Construction | 1967 |
| Kindergym Ltd | Arts & recreation | 2013 |
| King Kustoms UK Ltd | Manufacturing | 2019 |
| Kings Court Management (Stone) Limited | Real estate | 2009 |
| Kings Wood Tree Services Limited | Agriculture & fishing | 2024 |
| Kingsway Business Finance and Investments Limited | Financial services | 2005 |
| Kiss Telecom Ltd | Information & communication | 2022 |
| Kitty Hawk Aviation Training Limited | Transport & logistics | 2021 |
| Klar Consulting Limited | Professional & scientific | 2025 |
| Klick Business Solutions Limited | Professional & scientific | 2006 |
| Knexo Limited | Information & communication | 2025 |
| KPL Financial Services Limited | Financial services | 2008 |
| Kris Kelly CAD Designs Ltd | Professional & scientific | 2023 |
| Kular Consultancy Ltd | Professional & scientific | 2017 |
| L & D Russell Ltd | Administrative & support | 2017 |
| L H Bodyworks Ltd | Wholesale & retail | 2012 |
| L R S F Audio Limited | Administrative & support | 2019 |
| L&E Wood Properties Limited | Hospitality | 2026 |
| L&M Direct Consultancies Limited | Information & communication | 2022 |
| L2 Architectural Media Limited | Information & communication | 2023 |
| L2 Media Limited | Information & communication | 2016 |
| LAJ Software Services Ltd | Information & communication | 2012 |
| Lamb Lane Management Limited | Households | 2013 |
| Lamp Lighting UK Limited | Construction | 2011 |
| Large Diameter Solutions Limited | Construction | 2018 |
| Launched AI Ltd | Information & communication | 2025 |
| Launched Products Ltd | Wholesale & retail | 2022 |
| Laura's Nail IT Limited | Other services | 2016 |
| Lavinia Group Investments Ltd | Financial services | 2019 |
| LD Therapies, Supervision and Training Ltd | Education | 2025 |
| Lead OUT Labs Ltd | Professional & scientific | 2023 |
| Leeding Supply Chain Limited | Professional & scientific | 2023 |
| Leighton Hall Auctions Limited | Wholesale & retail | 2020 |
| Leighton Hall Group Limited | Financial services | 2025 |
| Leol Consultancy Limited | Professional & scientific | 2023 |
| LEX Consult Limited | Professional & scientific | 2014 |
| LEX Develop+Construct Ltd | Construction | 2019 |
| LEX Estates Ltd | Real estate | 2022 |
| LEX Group Holdings Ltd | Financial services | 2019 |
| LGB Plumbing and Heating Staffordshire Ltd | Administrative & support | 2017 |
| Lifebe CBT Ltd | Health & social care | 2018 |
| Little Stoke Management Company Limited | Construction | 2012 |
| Livingstone Projects Ltd | Construction | 2023 |
| LJS Legal Consultancy Limited | Professional & scientific | 2019 |
| Llhs Investments Limited | Professional & scientific | 2025 |
| Lloyds Global Developments Limited | Construction | 2022 |
| LNM Annappa Limited | Health & social care | 2020 |
| Local Helping Hands Limited | Administrative & support | 2017 |
| Location Removals Ltd | Transport & logistics | 2021 |
| Logira Limited | Administrative & support | 2025 |
| Logistics Hero Ltd | Transport & logistics | 2025 |
| Long Looms Property Ltd | Real estate | 2021 |
| Longton Jewellers Limited | Wholesale & retail | 2024 |
| Lord Hendrik Ltd | Professional & scientific | 2017 |
| Lord Stafford's Estates (1997) NO.3 Company Limited | Extraterritorial | 2017 |
| Lord Stafford's Estates (1997) NO.4 Company Limited | Extraterritorial | 2017 |
| Lord Stafford's Estates (Will) NO.1 Company Limited | Extraterritorial | 2017 |
| Lord Stafford's Estates (Will) NO.2 Company Limited | Extraterritorial | 2017 |
| Lotus Groundcare Ltd | Administrative & support | 2026 |
| Loughborough Electrical Projects Ltd | Professional & scientific | 2013 |
| Lousandra Limited | Hospitality | 2016 |
| Lpek Limited | Information & communication | 1993 |
| LRC Protection Limited | Financial services | 2024 |
| LSL Associates Limited | Professional & scientific | 2023 |
| Lucideon Cambridge Polymer Limited | Professional & scientific | 2014 |
| Lucideon Cics Limited | Professional & scientific | 1984 |
| Lucideon Group Limited | Professional & scientific | 2014 |
| Lucideon Limited | Professional & scientific | 1985 |
| Lumhenton Ltd | Manufacturing | 2025 |
| Lyle Productions Limited | Arts & recreation | 2021 |
| Lymestone Brewery Limited | Manufacturing | 2008 |
| Lyndhurst Child Care Ltd | Education | 2017 |
| M Clarke Upholstery Ltd | Other services | 2014 |
| M Scott Ltd | Construction | 2025 |
| M Weaver Limited | Agriculture & fishing | 2014 |
| M&O Property Developments Ltd | Construction | 2026 |
| M. Moore Brickwork Limited | Construction | 2020 |
| M. W. B. Computing Limited | Information & communication | 1986 |
| M.Green Parogon Limited | Hospitality | 2024 |
| M.J. Fleming Limited | Real estate | 1978 |
| M.L.B. Accountancy Limited | Professional & scientific | 2005 |
| M@T Car Sales Ltd | Wholesale & retail | 2025 |
| Machin Perfusion Services Limited | Professional & scientific | 2013 |
| MAE Trading Group Ltd | Other services | 2021 |
| Magnifique Limited | Manufacturing | 2001 |
| Maitland Consulting Services Limited | Information & communication | 2023 |
| Majestic Plastering & Rendering Ltd | Construction | 2026 |
| Majuma Limited | Professional & scientific | 2015 |
| Make YA Famous Records Ltd | Information & communication | 2013 |