| Kurdastan Bakary Ltd | Wholesale & retail | 2025 |
| Kurdish Grill Ltd | Hospitality | 2025 |
| Kurortno Stroitelstvo Ltd | Manufacturing | 2014 |
| Kustomized Limited | Wholesale & retail | 2013 |
| Kutemwa Health Ltd | Health & social care | 2023 |
| Kuziva Ltd | Health & social care | 2016 |
| KV Walsh Property Investments Ltd | Real estate | 2025 |
| KVJ Smiles Ltd | Health & social care | 2026 |
| KVW Consultancy Limited | Financial services | 2021 |
| KW Scantech Limited | Professional & scientific | 2025 |
| KW Water Services Limited | Construction | 1997 |
| Kwamena Couriers UK Ltd | Transport & logistics | 2026 |
| Kwickshopping Ltd | Wholesale & retail | 2023 |
| Kwik Freight Limited | Extraterritorial | 2000 |
| Kwikfixings & Tools Limited | Wholesale & retail | 2024 |
| Kwiknail Ltd | Wholesale & retail | 2024 |
| Kwiktip Limited | Water & waste | 2022 |
| KWP Renewables Ltd | Construction | 2024 |
| KWR Investments Ltd | Real estate | 2020 |
| KY Finance Limited | Professional & scientific | 2015 |
| KY Logistics Limited | Transport & logistics | 2025 |
| Kyabangi Limited | Wholesale & retail | 2020 |
| Kyanite Global Limited | Professional & scientific | 2018 |
| Kyben Properties Ltd | Real estate | 2023 |
| Kyeleon Ltd | Water & waste | 2015 |
| KYM Properties Ltd | Real estate | 2024 |
| Kyndred Ltd | Wholesale & retail | 2023 |
| Kyoto Digital Limited | Professional & scientific | 2024 |
| Kyoto Group Limited | Financial services | 2025 |
| Kyoto Properties Limited | Real estate | 2025 |
| Kytad Removals and Cleaning Limited | Transport & logistics | 2024 |
| Kyverno Limited | Professional & scientific | 2016 |
| KZS Holdings Limited | Financial services | 2021 |
| KZS Property Limited | Real estate | 2021 |
| L & B Electrical Ltd | Construction | 2006 |
| L & D Digital Solutions Ltd | Professional & scientific | 2017 |
| L & G Property Management Limited | Real estate | 2021 |
| L & L Commercial Consultants Ltd | Professional & scientific | 2021 |
| L & Q Property Ltd | Real estate | 2019 |
| L and R Joinery Ltd | Construction | 2025 |
| L Babb Holdings Ltd | Financial services | 2023 |
| L Brady Engineering Ltd | Manufacturing | 2017 |
| L Cheung Properties Ltd | Real estate | 2023 |
| L Firth Limited | Professional & scientific | 2019 |
| L G Stunts Ltd | Administrative & support | 2019 |
| L Hunt Building Ltd | Construction | 2025 |
| L J Jervis Designs Ltd | Information & communication | 2022 |
| L L Properties Limited | Real estate | 2016 |
| L M D Cleaning Solutions Limited | Administrative & support | 2013 |
| L Mcnally Properties Limited | Real estate | 2024 |
| L P Marketing Consultancy Ltd | Administrative & support | 2024 |
| L Stachini Limited | Information & communication | 2013 |
| L Thwaites Properties Ltd | Real estate | 2025 |
| L Watters Lifting Ltd | Construction | 2014 |
| L&B Creative Ventures Limited | Education | 2024 |
| L&B Recruitment Services Ltd | Construction | 2025 |
| L&G Properties Group Ltd | Real estate | 2026 |
| L&J Cookhouse Ltd | Hospitality | 2025 |
| L&J Property Solutions Ltd | Real estate | 2024 |
| L&L Holdings Investments Ltd | Financial services | 2023 |
| L&L Rentals Ltd | Real estate | 2023 |
| L&N Armstrong Ltd | Real estate | 2018 |
| L&P 134 Limited | Financial services | 2005 |
| L&P 137 Limited | Financial services | 2005 |
| L'Assaggino Group Limited | Hospitality | 2026 |
| L'Estrange London Limited | Manufacturing | 2013 |
| L. Kirkland Ltd. | Transport & logistics | 2014 |
| L.R.D Property Services Ltd | Construction | 2026 |
| L.Walters Consultants Ltd | Professional & scientific | 2020 |
| L2 Associates Ltd | Professional & scientific | 2016 |
| L3B Commerce Ltd | Wholesale & retail | 2024 |
| L810 Tennis Limited | Education | 2021 |
| LA Belle Care Limited | Health & social care | 2016 |
| LA Belle VUE Properties Limited | Real estate | 2026 |
| LA Burton Ltd | Real estate | 2016 |
| LA Casa Property Ltd | Real estate | 2024 |
| LA Catanaccia Football Academy Ltd | Education | 2017 |
| LA Commissioning Ltd | Professional & scientific | 2014 |
| LA Leche League Great Britain | Health & social care | 1981 |
| LA Maison Housing Limited | Real estate | 2025 |
| LA Petite Academy Limited | Education | 2003 |
| La.Body Limited | Other services | 2024 |
| Laade Breakfast Limited | Wholesale & retail | 2025 |
| Lab-Dz Limited | Education | 2026 |
| Labha Ltd | Health & social care | 2010 |
| Labo Property Holdings Limited | Real estate | 2020 |
| Labrada Holdings UK Limited | Financial services | 2024 |
| Labsoil Limited | Professional & scientific | 2013 |
| Laburn Limited | Administrative & support | 2026 |
| Lacerta Technology Limited | Manufacturing | 2003 |
| Lacey & Ball Decorating Limited | Construction | 2011 |
| Laday Assets UK Ltd | Construction | 2025 |
| Lady Grace Estates Ltd | Real estate | 2025 |
| Ladybird Day Nursery Limited | Education | 2018 |
| Ladybirds Nursery Limited | Education | 2002 |
| Lagan Bitumen Limited | Extraterritorial | 1985 |
| Lagom Derby CIC | Arts & recreation | 2018 |
| Lahafa Ltd | Financial services | 2025 |
| Lai's Holdings Ltd | Financial services | 2021 |
| Laid Back Ltd | Manufacturing | 2021 |