| Knightsbridge Business Centre (Gloucester) Limited | Real estate | 1981 |
| Knightsbridge Developments (Cheltenham) Limited | Financial services | 1978 |
| Knine Dog Studio Limited | Wholesale & retail | 2019 |
| Knockout Clothing Limited | Wholesale & retail | 2013 |
| Knowing Self Knowing Others Ltd | Professional & scientific | 2026 |
| Knowledge Acuity Ltd | Extraterritorial | 2013 |
| Knowledge Simulation School Ltd | Administrative & support | 2025 |
| Knowledge Spike Limited | Information & communication | 2015 |
| Knox & Walsh Installations Limited | Construction | 1984 |
| Ko-Ord Limited | Financial services | 2009 |
| KOA House Ltd | Real estate | 2024 |
| Kobaniretail Ltd | Wholesale & retail | 2025 |
| KOBE24 Ltd | Professional & scientific | 2020 |
| Kochi Inns Ltd | Hospitality | 2026 |
| Koffeeklatch Ltd | Professional & scientific | 2022 |
| Kohler Mira Limited | Manufacturing | 1930 |
| Kohler Mira UK Trustees Limited | Professional & scientific | 2001 |
| Kohler Showers Holdings Limited | Manufacturing | 2000 |
| Komelo Ltd | Information & communication | 2024 |
| Kong International (UK) Limited | Administrative & support | 2019 |
| Konik Ltd | Energy | 2020 |
| Konsar Ltd | Professional & scientific | 2012 |
| Kopite Project Management Ltd | Professional & scientific | 2016 |
| Korant Holdings Limited | Financial services | 2023 |
| Korora Limited | Information & communication | 2003 |
| Kosko Ltd | Hospitality | 2019 |
| Kosmos Media Ltd | Information & communication | 2026 |
| Kotecha Retail Limited | Hospitality | 2020 |
| KP Consulting Services Ltd | Professional & scientific | 2026 |
| Kpex Ltd | Information & communication | 2015 |
| KPG Nominees Limited | Professional & scientific | 2013 |
| KPK Direct Ltd | Wholesale & retail | 2018 |
| KPM Property Solutions Ltd | Real estate | 2024 |
| KPR Homes Limited | Real estate | 2016 |
| KPS - Nutrition Ltd | Health & social care | 2017 |
| Kraft Enterprises Limited | Hospitality | 2024 |
| Kraken Coaching Ltd | Arts & recreation | 2023 |
| Krisfiktion Media Limited | Information & communication | 2017 |
| Kriya Limited | Extraterritorial | 2010 |
| Krom Lettings Ltd | Real estate | 2022 |
| Ksbsc Limited | Information & communication | 2023 |
| KSC Estate & Lettings Agent Ltd | Real estate | 2024 |
| KT Cotswolds Property Ltd | Real estate | 2025 |
| KT Drilling Consultants Limited | Mining & quarrying | 1998 |
| KTM Property Developments Ltd | Construction | 2026 |
| KTR Environmental Solutions Limited | Professional & scientific | 2002 |
| Kudo Clubhouse Ltd | Hospitality | 2026 |
| Kudos Care (UK) Limited | Health & social care | 2013 |
| Kudu Developments Limited | Construction | 2024 |
| Kundu Properties Ltd | Real estate | 2025 |
| Kuro Intelligent Technologies Ltd | Information & communication | 2023 |
| Kutchenhaus Cheltenham Ltd | Wholesale & retail | 2023 |
| Kuvi Childcare Ltd | Health & social care | 2024 |
| KW Aesthetics Limited | Health & social care | 2019 |
| KW Optical Ltd | Health & social care | 2026 |
| KWL Installations Ltd | Administrative & support | 2016 |
| KWP Solutions (UK) Limited | Wholesale & retail | 2024 |
| Kyanhoss Ltd | Transport & logistics | 2023 |
| L & D Scaffolding Ltd. | Construction | 2000 |
| L & J Hood Limited | Real estate | 2017 |
| L & J Rowles Limited | Professional & scientific | 2003 |
| L & N Plastering Limited | Construction | 2021 |
| L a Developments of Cheltenham Ltd | Construction | 2026 |
| L BYE Consultancies Limited | Information & communication | 2025 |
| L C Eventing Limited | Arts & recreation | 2025 |
| L C G Homes Limited | Construction | 2023 |
| L Chung Limited | Health & social care | 2024 |
| L J Goddard Limited | Construction | 2003 |
| L Knox Electrical Ltd | Construction | 2026 |
| L M Joinery and Aspire Building Limited | Construction | 2017 |
| L R Williams Ltd | Construction | 2025 |
| L W L Limited | Education | 2006 |
| L&E Accounting Limited | Professional & scientific | 2011 |
| L&H Waring Limited | Administrative & support | 2021 |
| L&K Property Developments Ltd | Real estate | 2023 |
| L'Abri Apartment Ltd | Hospitality | 2023 |
| L.E. Unique Cleaning Services Ltd | Administrative & support | 2021 |
| L.G. Brown & Company (Textiles) Limited | Wholesale & retail | 1954 |
| L1NE Ltd | Professional & scientific | 2016 |
| L7 Productions Limited | Information & communication | 2022 |
| LA Agency Limited | Real estate | 2023 |
| LA Bella Boutique Hair Salon Ltd | Other services | 2023 |
| LA Boulangerie Artisan Ltd | Manufacturing | 2017 |
| LA DE DA Living Limited | Wholesale & retail | 2014 |
| LA Lola Ltd | Wholesale & retail | 2020 |
| LA Maison Bleu Investment Company Limited | Real estate | 2006 |
| LA Prima Decor Ltd | Construction | 2025 |
| LA TUA Casa Limited | Administrative & support | 2022 |
| LA Vechia Dining Ltd | Hospitality | 2026 |
| LA Vehicle Repairs Ltd | Wholesale & retail | 2023 |
| LA VIE Studio Ltd | Information & communication | 2025 |
| Labourease UK Ltd | Professional & scientific | 2024 |
| Laburinthos Limited | Arts & recreation | 2019 |
| Lace Holdings Limited | Financial services | 2024 |
| Laces Places Ltd | Real estate | 2025 |
| Ladski Ltd | Real estate | 2017 |
| Lady OH Ltd | Manufacturing | 2018 |
| Ladybirds 2024 Ltd | Wholesale & retail | 2024 |
| Laincar Limited | Real estate | 2015 |
| Laines Consultancy Limited | Professional & scientific | 2022 |