| K Narayanan Ltd | Health & social care | 2018 |
| K P Access Ltd | Construction | 2024 |
| K P Bowman Ltd | Construction | 2014 |
| K TAY Ltd | Health & social care | 2022 |
| K Taylor Plumbing & Heating Limited | Construction | 2003 |
| K Y 82 Limited | Administrative & support | 2014 |
| K&F Ahmad Property Ltd | Real estate | 2023 |
| K&F Global Limited | Professional & scientific | 2024 |
| K&G Properties (Newcastle) Ltd | Real estate | 2022 |
| K&Hs Properties Ltd | Real estate | 2022 |
| K&K Access Ltd | Professional & scientific | 2017 |
| K&K Textiles Ltd | Wholesale & retail | 2026 |
| K&S (Stanmore) Limited | Real estate | 2019 |
| K&S Impex Limited | Wholesale & retail | 2024 |
| K&S Rentals and Investments Ltd | Real estate | 2021 |
| K&S Signature Homes Ltd | Construction | 2025 |
| K-Walk (Penrith) Limited | Real estate | 2024 |
| K-Walk Consulting Ltd | Professional & scientific | 2022 |
| K-Walk Limited | Administrative & support | 2011 |
| K.Bennett Building Services Ltd | Construction | 2025 |
| K.C & Co Services Ltd | Wholesale & retail | 2023 |
| K.E.O Tyne Tidying Ltd | Administrative & support | 2026 |
| K.O. Property Services Limited Limited | Real estate | 2024 |
| K026689 Ltd | Wholesale & retail | 2025 |
| K1 Barbers (Whitley Bay) Ltd | Other services | 2021 |
| K1 Star Barber Ltd | Other services | 2024 |
| K2 Kinder Heaven Daycare Limited | Education | 2025 |
| K30RSYSCAFFOLDING Limited | Construction | 2025 |
| K3AH Cleaning Services Limited | Administrative & support | 2025 |
| K5 Properties Limited | Real estate | 2013 |
| K9 Tactical Security Ltd | Administrative & support | 2026 |
| K9-KARDIO Ltd | Other services | 2025 |
| KA Construction Solutions Ltd | Construction | 2025 |
| KA14LAR Limited | Hospitality | 2024 |
| Kaad Limited | Hospitality | 2013 |
| Kaani Pizza Ltd | Hospitality | 2025 |
| Kaaniexpress Ltd | Hospitality | 2026 |
| Kaar Estates Ltd | Real estate | 2022 |
| Kaas Cheese Ltd | Wholesale & retail | 2021 |
| Kaash Enterprises Ltd | Wholesale & retail | 2023 |
| Kablepulse Ltd | Energy | 2025 |
| Kachevski Property Holdings Ltd | Real estate | 2026 |
| Kadr Limited | Professional & scientific | 2014 |
| Kaefer Industrial Services Limited | Extraterritorial | 2004 |
| Kaefer Limited | Construction | 1995 |
| Kafa Consultancy Ltd | Information & communication | 2025 |
| Kaffablanca Ltd | Hospitality | 2025 |
| Kahlon General Stores Limited | Wholesale & retail | 2011 |
| Kai-Grace Limited | Health & social care | 2022 |
| Kaileomaisie Rodelas Limited | Hospitality | 2023 |
| KAIN9 Limited | Wholesale & retail | 2025 |
| Kaizen Community CIC | Education | 2024 |
| Kakathiya Solutions Limited | Information & communication | 2025 |
| Kakum Cafe Ltd | Hospitality | 2025 |
| Kala GM Ltd | Administrative & support | 2024 |
| Kaleidoscope Creative Films Agency Limited | Information & communication | 2017 |
| Kaleidosky Investment Ltd | Wholesale & retail | 2024 |
| Kaljet Pipefitters Ltd | Professional & scientific | 2013 |
| Kallummurrayfunny Ltd | Wholesale & retail | 2023 |
| Kalpvan Holdings UK Limited | Financial services | 2024 |
| Kalra & Co. Ltd. | Other services | 2014 |
| Kaltur Food Limited | Wholesale & retail | 2015 |
| Kaltur Pubs Limited | Administrative & support | 2016 |
| Kaltur Restaurant Limited | Hospitality | 2016 |
| KAM Civils Limited | Construction | 2023 |
| KAM Landscaping & Groundworks Limited | Construction | 2017 |
| KAM Property Investments North East Limited | Real estate | 2024 |
| KAM Technology Limited | Information & communication | 2004 |
| Kamal Restaurant Limited | Hospitality | 2014 |
| Kaminski Logistics Ltd | Transport & logistics | 2025 |
| Kamlyn Ltd | Real estate | 2015 |
| Kamo Academy Newcastle Ltd | Other services | 2022 |
| Kamo Clipper Gateshead Ltd | Other services | 2023 |
| Kamo Newcastle Ltd | Other services | 2022 |
| Kamrans Barbers North East Limited | Other services | 2018 |
| Kamrans Barbers United Ltd | Other services | 2018 |
| Kan-Yan Racing Ltd | Information & communication | 2020 |
| Kane Property Group Ltd | Real estate | 2025 |
| Kang Trading Limited | Wholesale & retail | 2013 |
| Kani Payments Holdings Limited | Financial services | 2022 |
| Kani Payments Limited | Information & communication | 2018 |
| Kanika Innovations Limited | Health & social care | 2017 |
| Kaniyarkuzhiyil Limited | Health & social care | 2015 |
| Kannan Chandran One Limited | Health & social care | 2022 |
| Kara Medical Ltd | Health & social care | 2018 |
| Karamaslam Holdco 1 Ltd | Real estate | 2020 |
| Karamaslam Holdco 2 Ltd | Real estate | 2020 |
| Karamaslam Holdco 3 Ltd | Real estate | 2020 |
| Karamaslam Karamgarde 2B SPV Limited | Real estate | 2024 |
| Karamgarde Holdco a Ltd | Real estate | 2020 |
| Karamgarde Holdco B Ltd | Real estate | 2020 |
| Karamgarde Holdco C Ltd | Real estate | 2020 |
| Karbon Developments Limited | Real estate | 2003 |
| Karbon Home Comforts Ltd | Administrative & support | 2014 |
| Karbon Land Ventures Limited | Real estate | 2022 |
| Karbon Solutions Limited | Professional & scientific | 2015 |
| Karen Davison Developments Limited | Construction | 2018 |
| Karim A-A Ltd | Other services | 2025 |
| Karim Wholesale Ltd | Wholesale & retail | 2024 |
| Karl’S Tours and Travels Limited | Manufacturing | 2025 |