| Jumping Fish Limited | Information & communication | 2008 |
| Jumping Spider Films Limited | Administrative & support | 2010 |
| Jumpkey Holdings Limited | Financial services | 2025 |
| Jumpkey Limited | Hospitality | 1985 |
| Juna Holdings Limited | Real estate | 2021 |
| Jungle Juice Southwest Ltd | Arts & recreation | 2023 |
| Just Camps Gloucester Limited | Health & social care | 2025 |
| Just Incase Gifts Limited | Wholesale & retail | 2019 |
| Just Invest Ltd | Extraterritorial | 2014 |
| Just Juice Enit Limited | Wholesale & retail | 2018 |
| Just Mobile Tyres Ltd | Wholesale & retail | 2020 |
| Just Surveys Ltd | Water & waste | 2006 |
| Just Tyres Limited | Extraterritorial | 2013 |
| Justbookit Global Ventures Ltd | Administrative & support | 2026 |
| Justcare ZK Ltd | Health & social care | 2024 |
| Justcorn Foods Limited | Manufacturing | 2022 |
| JW & Co Maintenance and Building Services Ltd | Construction | 2020 |
| JW Crane & Lifting Compliance Ltd | Professional & scientific | 2026 |
| JW Private Hire Limited | Transport & logistics | 2025 |
| JWC First AID Ltd | Education | 2023 |
| Jyreh Properties Ltd | Real estate | 2023 |
| K & E Cleaning Services Ltd | Administrative & support | 2026 |
| K & E Healthcare Services Ltd | Health & social care | 2026 |
| K & H Computing Limited | Information & communication | 2001 |
| K & K Trans Ltd | Transport & logistics | 2020 |
| K and H Real Estates Ltd | Real estate | 2025 |
| K and L Fagan Properties LLP | | 2025 |
| K Building & Landscaping Ltd | Administrative & support | 2025 |
| K Dobbs Carpentry Limited | Construction | 2017 |
| K Harries & Co Limited | Financial services | 2024 |
| K Hossle Ltd | Other services | 2024 |
| K J Potter Services Ltd | Construction | 2025 |
| K Jennings Electrical Limited | Construction | 2019 |
| K M Utilities Ltd | Construction | 2026 |
| K Power Ltd | Wholesale & retail | 2008 |
| K R Daniels Plumbing & Heating Limited | Construction | 2016 |
| K S Griffith Limited | Construction | 2013 |
| K Shop Hub Ltd | Wholesale & retail | 2026 |
| K Storage Limited | Construction | 2024 |
| K Wazir Ltd | Information & communication | 2026 |
| K&J (Gloucester) Ltd | Real estate | 2022 |
| K&P Solutions Ltd | Financial services | 2024 |
| K&R Roofing Ltd | Construction | 2020 |
| K&R Ventures Ltd | Financial services | 2020 |
| K-Lec Ltd | Construction | 2017 |
| K-Lets Ltd | Real estate | 2022 |
| K. Collier Landscapes Limited | Administrative & support | 2014 |
| K.L. Plumbing & Heating Ltd | Manufacturing | 2002 |
| K.M. Keates Electrical Contracting Limited | Construction | 2003 |
| K15 Limited | Professional & scientific | 2012 |
| K28 Distributions Ltd | Wholesale & retail | 2025 |
| K4M Ltd | Transport & logistics | 2019 |
| K4VENTURES Ltd | Real estate | 2025 |
| K9 Agility Ltd | Other services | 2023 |
| Kaams Transport Ltd | Wholesale & retail | 2021 |
| Kaashvin Properties Ltd | Real estate | 2026 |
| Kaashvin Technologies Ltd | Information & communication | 2023 |
| Kaay Group Limited | Hospitality | 2025 |
| Kaay Properties Ltd | Real estate | 2021 |
| Kahuni Ltd | Health & social care | 2024 |
| Kahwah & Kaimati Ltd | Hospitality | 2025 |
| Kaiser + Kraft Limited | Wholesale & retail | 1974 |
| Kaji & Kala Ltd | Real estate | 2024 |
| Kalcutt Holdings Ltd | Real estate | 2023 |
| Kalex Films Limited | Manufacturing | 2019 |
| Kalika JI Ltd | Hospitality | 2024 |
| Kalms Limited | Manufacturing | 1981 |
| Kalyke Limited | Extraterritorial | 2015 |
| Kalyto Ltd | Transport & logistics | 2024 |
| KAM DIX Coaching Ltd | Other services | 2023 |
| Kamakshi Living Ltd | Real estate | 2025 |
| Kameo Properties Ltd | Real estate | 2026 |
| Kamils Logistic Ltd | Transport & logistics | 2018 |
| Kammp Properties Ltd | Real estate | 2015 |
| Kana Private Ltd | Wholesale & retail | 2022 |
| Kandahar Village Ltd | Hospitality | 2023 |
| Kang Hotel Service Ltd | Hospitality | 2024 |
| Kang Hotel UK Ltd | Financial services | 2024 |
| Kang Legal Ltd | Professional & scientific | 2013 |
| Kanijis Limited | Health & social care | 2014 |
| Kanijis Properties Limited | Real estate | 2022 |
| Kapark Ltd | Wholesale & retail | 2014 |
| Kapeesh Consulting Ltd | Information & communication | 2016 |
| Kaprico Limited | Wholesale & retail | 2009 |
| Kaprico Properties Limited | Real estate | 2018 |
| Kapted Limited | Health & social care | 2024 |
| Karak Chaii Gloucester Ltd | Hospitality | 2024 |
| Karen Wood Consulting Ltd | Administrative & support | 2018 |
| Kargi Pastoralist Link (UK & Kenya) | Extraterritorial | 2008 |
| Karlssons Properties Limited | Construction | 2016 |
| Karteys Limited | Information & communication | 2016 |
| Karva Care Services Limited | Health & social care | 2013 |
| KAS Support Services Ltd | Health & social care | 2017 |
| Kasa Asset Holdings Ltd | Real estate | 2024 |
| Kasa Property Manager Ltd | Real estate | 2024 |
| Kasa Solutions Ltd | Real estate | 2022 |
| Kasa Tech Limited | Information & communication | 2025 |
| Kaspas Exeter Limited | Hospitality | 2016 |
| Kaspas Newport Ltd. | Hospitality | 2016 |
| Kaspas South West Ltd | Wholesale & retail | 2016 |