| K Recruits Ltd | Administrative & support | 2023 |
| K&B Anytime Service Ltd | Transport & logistics | 2017 |
| K&F Spices Ltd | Hospitality | 2023 |
| K&J Bolger Building Contractors Limited | Construction | 2017 |
| K&K Civils & Groundworks Ltd | Construction | 2025 |
| K&M Naturals Ltd | Other services | 2024 |
| K&M Torpey Property Limited | Real estate | 2023 |
| K&N Electrical Supplies Ltd | Wholesale & retail | 2025 |
| K&N Security Company Ltd | Administrative & support | 2024 |
| K&S Carers Ltd | Health & social care | 2022 |
| K&V Construction Ltd | Construction | 2012 |
| K-Fix Systems Ltd | Construction | 2020 |
| K-Health Systems Ltd | Professional & scientific | 2019 |
| K-Met Installations Ltd | Construction | 2012 |
| K. Johnson Electrical Limited | Construction | 2016 |
| K.& W.Investment Co. | Administrative & support | 1966 |
| K.B. Protec Ltd. | Manufacturing | 2011 |
| K.B. Protech Limited | Administrative & support | 2022 |
| K.Houseservices Ltd | Construction | 2026 |
| K.O.S. Boxing Ltd | Arts & recreation | 2021 |
| K.P.D Associates Limited | Health & social care | 2013 |
| K.R Meanwood Sushi Ltd | Hospitality | 2025 |
| K.R. Sushi Ltd | Wholesale & retail | 2021 |
| K.R.P. Property Holdings Limited | Financial services | 2023 |
| K.Robo Lettings Ltd | Real estate | 2014 |
| K.Smith & Daughters Ltd | Hospitality | 2025 |
| K1 Refurb & Construction Services Ltd | Construction | 2024 |
| K1 Transport Services Ltd | Transport & logistics | 2022 |
| K1 Urban Living Ltd | Households | 2025 |
| K148 Limited | Other services | 2017 |
| K2 Engineering Services Limited | Manufacturing | 2005 |
| K29 Pets Ltd | Wholesale & retail | 2025 |
| K2B Investments Limited | Construction | 2021 |
| K2B Transportation Limited | Transport & logistics | 2020 |
| K3 UK Property Ltd | Real estate | 2026 |
| K3TRANSPORT Limited | Transport & logistics | 2022 |
| KA Chun Plumbing and Heating Ltd | Construction | 2026 |
| Kaamh Limited | Transport & logistics | 2024 |
| Kaba Sites Limited | Professional & scientific | 2021 |
| Kabo Developments Ltd | Construction | 2023 |
| Kaboodlz Ltd | Wholesale & retail | 2020 |
| Kachadula Ltd | Information & communication | 2018 |
| Kacico Trading Limited | Wholesale & retail | 2025 |
| KAD Construction and Developments Ltd | Real estate | 2026 |
| KAD Retail Ltd | Construction | 2017 |
| Kada Research Limited | Professional & scientific | 2011 |
| Kadampa Meditation Centre Sheffield | Other services | 1991 |
| Kade London Limited | Wholesale & retail | 2026 |
| Kadicheeni Company Ltd | Real estate | 2008 |
| Kadir Food Ltd | Wholesale & retail | 2025 |
| Kadi’S Store Limited | Wholesale & retail | 2025 |
| Kado a 2 Z Ltd | Transport & logistics | 2019 |
| Kado Hair Geniene Ltd | Other services | 2024 |
| Kado Hair Ltd | Other services | 2023 |
| Kado Hair Paige Ltd | Other services | 2024 |
| Kaduku PVT Limited | Health & social care | 2019 |
| Kady's K9'S Ltd | Other services | 2025 |
| KAF Professional Services Limited | Professional & scientific | 1996 |
| Kafe Stannington Ltd | Hospitality | 2019 |
| Kafeel Khan Online Mart Ltd | Wholesale & retail | 2025 |
| Kaha Human Performance LAB Ltd | Education | 2022 |
| Kahler Photography Limited | Professional & scientific | 2022 |
| Kahstopandgo Ltd | Transport & logistics | 2025 |
| KAI YU Limited | Financial services | 2012 |
| Kaiban Ltd | Information & communication | 2020 |
| Kaif Cabs Ltd | Administrative & support | 2019 |
| Kaige Limited | Health & social care | 2018 |
| Kaima Properties Limited | Real estate | 2025 |
| Kaini Instruments Ltd | Information & communication | 2026 |
| Kairo Productions Ltd | Hospitality | 2026 |
| Kairos Medical Informatics Ltd | Health & social care | 2018 |
| Kairos Star Ltd | Hospitality | 2025 |
| Kaiser Ventures Ltd | Financial services | 2025 |
| Kaiyy Ltd | Wholesale & retail | 2021 |
| KAIZ3N Ltd | Professional & scientific | 2023 |
| Kaizav Limited | Wholesale & retail | 2025 |
| Kaizen IT Solutions Ltd | Information & communication | 2004 |
| Kaizen Telecom Ltd | Information & communication | 2009 |
| Kajiya Limited | Hospitality | 2021 |
| Kaka Poplab Limited | Wholesale & retail | 2025 |
| Kake by Koffee House Limited | Hospitality | 2025 |
| Kaki Mini Market Ltd | Wholesale & retail | 2025 |
| Kalakiri Ltd | Real estate | 2024 |
| Kalas Travels Limited | Administrative & support | 2025 |
| Kalateya Ltd | Health & social care | 2024 |
| Kaleid Ltd | Arts & recreation | 2015 |
| Kaleido Arts for Wellbeing CIC | Education | 2021 |
| Kaleido Sheffield Ltd | Other services | 2022 |
| Kali Sound Limited | Professional & scientific | 2018 |
| Kalim Cleaning Services Limited | Administrative & support | 2016 |
| Kalirai Consultancy Ltd | Health & social care | 2011 |
| Kalmaf Limited | Real estate | 2016 |
| Kalnina Arbitration Ltd | Professional & scientific | 2022 |
| Kalocsai Ltd | Wholesale & retail | 2021 |
| Kalodia Limited | Manufacturing | 2024 |
| Kals Online Ltd | Wholesale & retail | 2024 |
| Kalyl Services Limited | Construction | 2025 |
| Kalynaartstudio CIC | Wholesale & retail | 2025 |
| KAM Investments Limited | Real estate | 1992 |
| KAM Jeanswear Limited | Wholesale & retail | 2009 |