| Khte Investments Ltd | Real estate | 2026 |
| Kids Zone (Notts) Ltd | Arts & recreation | 2003 |
| Kidzgrove Daycare Ltd | Health & social care | 2022 |
| Kielbowicz Ltd | Transport & logistics | 2017 |
| Kieren Edden Hairdressing Ltd | Other services | 2026 |
| Kiing's Barbers Mansfield Ltd | Other services | 2023 |
| Kiki Properties Ltd | Real estate | 2021 |
| Kimsky Ltd | Construction | 2019 |
| Kinetic Fire Services Limited | Administrative & support | 2024 |
| Kinetic ICT Solutions Limited | Information & communication | 2003 |
| Kingnumb Ltd | Wholesale & retail | 2021 |
| Kings Residential Property Ltd | Construction | 2026 |
| Kingsley Build Limited | Construction | 2020 |
| Kingsley CW Limited | Real estate | 2025 |
| Kingsley Lettings and Development Limited | Real estate | 2021 |
| Kingsley PD Limited | Construction | 2018 |
| Kingstand Kennels Limited | Other services | 2026 |
| Kinloch Contract Services Limited | Construction | 2024 |
| Kinnex Ltd | Construction | 2019 |
| Kirat Tax Returns Ltd | Professional & scientific | 2019 |
| Kirchin & Company Limited | Extraterritorial | 2001 |
| Kirk Inns Limited | Hospitality | 2005 |
| Kiss Mortgages Ltd | Financial services | 2022 |
| Kitchen Makeover Expert Ltd | Construction | 2020 |
| Kitchen Table Cafe Ltd | Hospitality | 2026 |
| Kite Property Solutions Ltd | Real estate | 2026 |
| Kitty Sitter Limited | Other services | 2024 |
| Kiwi Competitions Limited | Wholesale & retail | 2025 |
| Kixx Newark on Trent Ltd | Education | 2023 |
| KJB Investments Ltd | Other services | 2023 |
| KJR Interiors Ltd | Construction | 2025 |
| KK Prime Stock Ltd | Professional & scientific | 2026 |
| KLL Trading Ltd | Wholesale & retail | 2026 |
| KLS Installations Ltd | Manufacturing | 2008 |
| KM Pitches and Groundworks Limited | Construction | 2024 |
| Kmark Construction Limited | Construction | 2007 |
| KMD Elite Ltd | Professional & scientific | 2026 |
| KMN Trailer Repair Specialist Ltd | Manufacturing | 2024 |
| Knfautos Ltd | Professional & scientific | 2025 |
| Knight Berry Ltd | Construction | 2016 |
| Knight Inc Consultants Ltd | Professional & scientific | 2017 |
| Knights Accountants Limited | Professional & scientific | 2005 |
| Knightstock Services Ltd | Construction | 2018 |
| Knowles Solutions Limited | Professional & scientific | 2025 |
| Knowmans Building Services Limited | Manufacturing | 2015 |
| Koan Creative Limited | Professional & scientific | 2023 |
| Kohzadtech Ltd | Information & communication | 2026 |
| KON Lifting Ltd | Construction | 2023 |
| Koncept Design & Management Ltd | Professional & scientific | 2026 |
| Kongo Trans Ltd | Transport & logistics | 2018 |
| Koolaz Ltd | Wholesale & retail | 2016 |
| Kordus Consulting Limited | Professional & scientific | 2017 |
| Kornquest Games Limited | Wholesale & retail | 2025 |
| Kotra Limited | Transport & logistics | 2021 |
| KPF Kitchen Professional Fit Ltd | Construction | 2016 |
| Kreativity Marketing Ltd | Professional & scientific | 2018 |
| Krizma Limited | Hospitality | 2019 |
| KRJ Property Ltd | Real estate | 2020 |
| KRK UK Midland Limited | Wholesale & retail | 2020 |
| Krue Property Ltd | Real estate | 2023 |
| Krups Limited | Professional & scientific | 2018 |
| Krystal Cleaning Solutions Ltd | Administrative & support | 2026 |
| Krystal Designs Company Ltd | Professional & scientific | 2021 |
| Krzysztof Adam Salach Limited | Extraterritorial | 2024 |
| Krzysztof Salach Ltd | Extraterritorial | 2025 |
| KS & CS Properties Limited | Real estate | 2019 |
| Ksh@Pace Gym and Fitness Centre Ltd | Arts & recreation | 2021 |
| Ksmsrs Limited | Real estate | 2015 |
| KST Food Manufacturing Consultancy Ltd | Administrative & support | 2019 |
| KTB Property Ltd | Real estate | 2014 |
| KTE Media Ltd | Professional & scientific | 2026 |
| Ktmrestaurant Limited | Hospitality | 2019 |
| Kudos Heating Limited | Construction | 2019 |
| Kunix Limited | Health & social care | 2017 |
| Kurio 3D Compression Ltd | Manufacturing | 2012 |
| Kurio Group Limited | Manufacturing | 2011 |
| Kurio Manufacturing Ltd | Manufacturing | 2012 |
| Kutchenhaus Mansfield Ltd | Wholesale & retail | 2021 |
| Kutchenhaus Nottingham Ltd | Wholesale & retail | 2023 |
| Kveikja Limited | Information & communication | 2016 |
| KVS Trade Limited | Hospitality | 2025 |
| Kyla Arenshaw Ltd | Professional & scientific | 2026 |
| L & B Mansfieldtiling Ltd | Construction | 2021 |
| L & D Bars Ltd | Hospitality | 2025 |
| L & R Limited | Other services | 2013 |
| L & R Midlands Property Investments Ltd | Real estate | 2025 |
| L and H Services (Mansfield) Limited | Other services | 2017 |
| L and M Family PUB Ltd | Hospitality | 2024 |
| L Clay Chimney Sweeping Services Limited | Administrative & support | 2022 |
| L H Cosmetics Ltd | Other services | 2026 |
| L Hutchinson Holdings Ltd | Real estate | 2026 |
| L&J Pro Clean Limited | Administrative & support | 2026 |
| L&Jtrans Ltd | Transport & logistics | 2015 |
| L&N Design LLP | | 2025 |
| L&P Fascias Ltd | Construction | 2022 |
| L.A. Components Limited | Extraterritorial | 1973 |
| L.R.D. Properties Ltd | Real estate | 2020 |
| L2W Limited | Wholesale & retail | 2024 |
| LA Electrics Limited | Construction | 2004 |
| LA Familia on Line Ltd | Information & communication | 2025 |