| KJS Enterprises NE Ltd | Wholesale & retail | 2024 |
| KK Projects NE Ltd | Professional & scientific | 2023 |
| Kkiinngg Auto Body Shop Ltd | Wholesale & retail | 2024 |
| KL Ceremonies Limited | Other services | 2018 |
| KLC Marine Scaffolding Services Ltd | Construction | 2019 |
| KLD Site Services Ltd | Construction | 2026 |
| Kleansafe Ltd | Manufacturing | 2025 |
| Klewz Ltd | Wholesale & retail | 2026 |
| KLG Property Developments Ltd | Construction | 2025 |
| Kljl Property Group Limited | Real estate | 2022 |
| KLN Insulation Services Limited | Construction | 2018 |
| Klrk Ltd | Construction | 2019 |
| KLS Wedding Films Limited | Information & communication | 2018 |
| KM Foods Ltd. | Other services | 2015 |
| KM Management Solutions Limited | Hospitality | 2013 |
| KM Mechanical Solutions Ltd | Professional & scientific | 2024 |
| Kmac Rigging Ltd | Construction | 2026 |
| Kmains Project Controls Ltd | Administrative & support | 2006 |
| KMC Electrical Installations Limited | Construction | 2019 |
| KMC Management Solutions Limited | Manufacturing | 2013 |
| Kmerritt Ltd | Health & social care | 2026 |
| KMF Lifting Engineering Limited | Professional & scientific | 2026 |
| KMJ Offshore Ltd | Professional & scientific | 2025 |
| KMK Commissioning Ltd | Professional & scientific | 2026 |
| KML Glass (NE) Limited | Construction | 2015 |
| KMM Surgical Limited | Health & social care | 2018 |
| KMV Recruitment Ltd | Administrative & support | 2013 |
| Kmvs Ltd | Transport & logistics | 2023 |
| KMW Services (NE) Ltd | Professional & scientific | 2019 |
| KNG Motors Ltd | Wholesale & retail | 2026 |
| Know Safety, Quality and Environmental Services Limited | Other services | 2014 |
| Knowesgate Hotel Boston Limited | Hospitality | 2018 |
| Knowesgate Hotel Limited | Hospitality | 2019 |
| Knowesgate Hotel Middlesbrough Limited | Hospitality | 2023 |
| Knowesgate Hotel Skegness 1 Limited | Hospitality | 2024 |
| Knownseal Ltd | Wholesale & retail | 2020 |
| Knrs North East Limited | Professional & scientific | 2017 |
| KO Fine Finishes Limited | Construction | 2022 |
| Kobe Creative Studio Ltd | Information & communication | 2026 |
| Kochin TR Property Investment Ltd | Real estate | 2026 |
| Kolayam Ltd | Information & communication | 2023 |
| Kollocal PVT Ltd | Information & communication | 2025 |
| KON Trading Ltd | Wholesale & retail | 2025 |
| Kotli Pizzeria Ltd | Hospitality | 2024 |
| Kovac Groundworks Ltd | Construction | 2025 |
| KP Core LMC Limited | Real estate | 2025 |
| KP Valve Services Limited | Professional & scientific | 2012 |
| Kp's Global Academy Limited | Education | 2025 |
| KPB Financial Ltd | Financial services | 2019 |
| KPC Spanish Cleaning Supplies Limited | Wholesale & retail | 2024 |
| KPD Property Ltd | Real estate | 2024 |
| Kpmrg Ltd | Professional & scientific | 2014 |
| KR Mobility Solutions Limited | Manufacturing | 2026 |
| KR Thompson Engineering Limited | Administrative & support | 2010 |
| Kraken IM Limited | Information & communication | 2016 |
| KRB Rail Services (NE) Limited | Professional & scientific | 2019 |
| Kren Limited | Professional & scientific | 2007 |
| Krew Ltd | Construction | 2017 |
| Kris Handynovate Ltd | Construction | 2025 |
| Krishaans Ltd | Transport & logistics | 2026 |
| Krishmay Holdings Limited | Financial services | 2025 |
| KRM Communications Ltd | Information & communication | 2019 |
| KRS Marine Limited | Professional & scientific | 2014 |
| KS Housing Solutions Ltd | Real estate | 2020 |
| KS Kitchens Limited | Construction | 2016 |
| KS Mechanical Maintenance Ltd | Administrative & support | 2025 |
| Ksars BSC Ltd | Administrative & support | 2023 |
| Kssd Limited | Information & communication | 2026 |
| KTH Ltd | Hospitality | 2025 |
| KTS Management Ltd | Professional & scientific | 2014 |
| Kubera Properties NE Ltd | Real estate | 2023 |
| Kufaishi Group Ltd | Real estate | 2020 |
| Kullar Stores Limited | Wholesale & retail | 2025 |
| Kun'Es Ltd | Professional & scientific | 2023 |
| Kung FU Panda Limited | Hospitality | 2025 |
| Kurdish Foods Pro Ltd | Hospitality | 2025 |
| Kurdish Kutz Ltd | Other services | 2022 |
| Kurdish Shawarma (Darlington) Ltd | Hospitality | 2025 |
| Kurt Hand Bags Limited | Wholesale & retail | 2017 |
| Kvv's Andhra Kitchen Ltd | Wholesale & retail | 2026 |
| KW Property Group Limited | Real estate | 2016 |
| KW Windservice Ltd | Professional & scientific | 2026 |
| Kwoodier Lifting Ltd | Construction | 2025 |
| Kyra Entreprises Limited | Wholesale & retail | 2020 |
| Kyrg Ltd | Professional & scientific | 2026 |
| Kyros Technical Ltd | Construction | 2025 |
| L & C Secure Limited | Real estate | 2003 |
| L & H Trading (North East) Limited | Wholesale & retail | 2019 |
| L & J Contracting Services Limited | Construction | 2021 |
| L & L Developments of Teesside Ltd | Construction | 2022 |
| L & L Landscape & Gardening Services Ltd | Agriculture & fishing | 2025 |
| L a Construction (NE) Ltd | Construction | 2023 |
| L Armstrong Renewables Ltd | Professional & scientific | 2026 |
| L Donoghue Limited | Wholesale & retail | 2014 |
| L G C Electrical Limited | Construction | 2018 |
| L G S Housing Limited | Real estate | 2026 |
| L H Property Rentals Ltd | Real estate | 2017 |
| L M Patton Ltd | Construction | 2023 |
| L Noble Limited | Other services | 2022 |
| L S Foods Ltd | Wholesale & retail | 2016 |