| K Wright Performance Limited | Education | 2025 |
| K&A Mini Market Ltd | Wholesale & retail | 2012 |
| K&B Car Centre Ltd | Wholesale & retail | 2018 |
| K&B Fitting Limited | Construction | 2025 |
| K&B Property Solutions Ltd | Real estate | 2015 |
| K&E Estate Limited | Real estate | 2011 |
| K&E Logistics Ltd | Transport & logistics | 2021 |
| K&H Portfolio Ltd | Real estate | 2021 |
| K&H Service Centre Limited | Wholesale & retail | 2026 |
| K&K Caribbean Catering Ltd | Hospitality | 2025 |
| K&L Accounting Limited | Professional & scientific | 2026 |
| K&L Catering Services Ltd | Hospitality | 2026 |
| K&L Living Ltd | Real estate | 2024 |
| K&L Luxury Lounge Ltd | Other services | 2026 |
| K&L Property Claims & Entitlement Ltd | Construction | 2025 |
| K&L Property Creations Ltd | Real estate | 2025 |
| K&M Transport Service Ltd | Transport & logistics | 2024 |
| K&N Management Limited | Arts & recreation | 2023 |
| K&O Care and Cleaning Services Ltd | Administrative & support | 2025 |
| K&S Homes (Nottingham) Limited | Real estate | 2026 |
| K&T Promotions Ltd | Arts & recreation | 2025 |
| K&Z Properties Ltd | Real estate | 2019 |
| K-Goal Ltd | Health & social care | 2010 |
| K-Itc Services Midlands Ltd | Administrative & support | 2013 |
| K-Pop Korner London Ltd | Wholesale & retail | 2025 |
| K-Skin & Aesthetics Ltd | Other services | 2021 |
| K-Tibi Line Ltd | Wholesale & retail | 2018 |
| K-Trac Ltd | Water & waste | 2024 |
| K. & a. COX Limited | Manufacturing | 2014 |
| K. J. Eaton & Co (Accountants) Ltd. | Professional & scientific | 1995 |
| K. Mitchell Decorating Limited | Construction | 2001 |
| K. T. Security Solutions Limited | Other services | 2010 |
| K.& M.(Hauliers)Limited | Transport & logistics | 1948 |
| K.Aa Healthcare Ltd | Health & social care | 2020 |
| K.B. Install Limited | Construction | 1995 |
| K.G-P Training Academy Ltd | Other services | 2023 |
| K.K Logistics South Ltd | Transport & logistics | 2021 |
| K.K.L Motors and NG8 Auto Service Ltd | Wholesale & retail | 2022 |
| K.Koziel Ltd | Transport & logistics | 2020 |
| K.P. Properties (Nottingham) Limited | Real estate | 2002 |
| K.P.B. Building Limited | Construction | 2008 |
| K1 Barber Art Limited | Other services | 2018 |
| K10 Working Dogs UK Ltd | Wholesale & retail | 2010 |
| K2 Clarity Ltd | Professional & scientific | 2025 |
| K2 Environment Limited | Professional & scientific | 2020 |
| K2 Evolve Limited | Financial services | 2026 |
| K2 Fashions Ltd | Wholesale & retail | 2025 |
| K2 Projects Ltd | Agriculture & fishing | 2025 |
| K2 Transport Ltd | Transport & logistics | 2018 |
| K3DX (UK) Limited | Extraterritorial | 2015 |
| K4 Trans Ltd | Transport & logistics | 2022 |
| K5VNW Driver Hire Limited | Transport & logistics | 2021 |
| K9 4 Life Limited | Wholesale & retail | 2024 |
| K9 Media Limited | Information & communication | 2005 |
| K9 Midco Limited | Administrative & support | 2017 |
| K9 Topco Limited | Administrative & support | 2017 |
| KA Building Solutions Ltd | Construction | 2024 |
| KA Hong Investment Limited | Real estate | 2025 |
| KA Trade Ltd | Wholesale & retail | 2023 |
| Ka-La-Do 2000 Ltd | Transport & logistics | 2017 |
| Kaaimans International Limited | Wholesale & retail | 2017 |
| Kaaimans Ltd | Real estate | 2015 |
| Kaamal Limited | Wholesale & retail | 2022 |
| Kaarv Limited | Information & communication | 2025 |
| KAB Best Holdings Ltd | Financial services | 2025 |
| Kabbline Ltd | Wholesale & retail | 2023 |
| Kabeerandsons Ltd | Professional & scientific | 2025 |
| Kabi Academic Limited | Education | 2014 |
| Kabia House CIC | Hospitality | 2023 |
| Kabodh Service Limited | Health & social care | 2018 |
| Kabul Chaska Limited | Hospitality | 2025 |
| Kabul Express UK Ltd | Hospitality | 2016 |
| Kabul Kebab Limited | Hospitality | 2025 |
| Kabul Star Ltd | Hospitality | 2026 |
| KAC Medix Ltd | Health & social care | 2022 |
| Kace Consultants Ltd | Professional & scientific | 2021 |
| Kache Food Systems Limited | Professional & scientific | 2014 |
| Kaching-Del Ltd | Professional & scientific | 2016 |
| KADAK9 Ltd | Agriculture & fishing | 2021 |
| Kadampa Meditation Centre Nottingham Limited | Other services | 1993 |
| Kadima Holdings Limited | Professional & scientific | 2006 |
| Kadima Properties (UK) Limited | Real estate | 2006 |
| Kadmoh Painting and Decoration Ltd | Construction | 2024 |
| KAF Squad Ltd | Wholesale & retail | 2020 |
| Kafe ALB Ltd | Manufacturing | 2025 |
| Kafe Culture Limited | Hospitality | 2025 |
| Kafe UK Limited | Manufacturing | 2024 |
| Kafeel Homes Ltd | Other services | 2018 |
| KAG1 Limited | Wholesale & retail | 2025 |
| KAG2 Limited | Wholesale & retail | 2025 |
| KAG3 Limited | Wholesale & retail | 2025 |
| KAH Management Limited | Professional & scientific | 2018 |
| KAH Property Limited | Construction | 2023 |
| Kahf Properties Ltd | Real estate | 2025 |
| Kahkashan Limited | Real estate | 2025 |
| Kahn Design & Build Ltd | Real estate | 2024 |
| KAI Traffic Solutions Ltd | Construction | 2026 |
| Kailashi UK Ltd | Real estate | 2024 |
| Kairo Living Limited | Health & social care | 2024 |
| Kairos Conveyor Ltd | Manufacturing | 2025 |