| Keane J Limited | Huddersfield | 2021 |
| Keeley Healthcare Limited | Wigan | 2025 |
| Keeley Wellbeing Ltd | Rugby | 2023 |
| Keeping IT Real 24/7 Community Interest Company | Manchester | 2020 |
| Keith Carter & Associates Limited | London | 2025 |
| Keith Frost (Caledonian) Ltd | Walton On The Naze | 2022 |
| Keith Frost Ltd | Walton On The Naze | 2022 |
| Keizon's Care Ltd | Neath | 2024 |
| Kellainey Care Ltd | London | 2025 |
| Kelly Fire Protection Ltd | Luton | 2026 |
| Kelly Hoganson Ltd | Consett | 2020 |
| Kelly Psychology Limited | London | 2020 |
| Kelmarkad Limited | Oldham | 2025 |
| Keloscape Fire Consult Ltd | Gloucester | 2018 |
| Kemaco Limited | London | 2022 |
| Kemova Healthcare Limited | Nottingham | 2022 |
| Kemson Care Services Ltd | London | 2018 |
| Kenachibu Services Limited | Leicester | 2018 |
| Kenbod Limited | Romford | 2022 |
| Kenia Limited | Faringdon | 2023 |
| Kenilworth Domiciliary Care Limited | Kenilworth | 2022 |
| Kenneth Payne & Associates Ltd | Oxford | 2023 |
| Kenny Goldcoast Ltd | Edinburgh | 2023 |
| Kenphil Enterprises Ltd | Birmingham | 2025 |
| Kenrobbo Limited | Liverpool | 2024 |
| Kent Fire & Risk Ltd | Ramsgate | 2025 |
| Kent Fire and Security Limited | Gravesend | 2017 |
| Kent Fire Consultants Management Ltd | Cardiff | 2020 |
| Kent Fire Protection Services Ltd | Gravesend | 2024 |
| Kent Fire Safe Ltd | Folkestone | 2024 |
| Kent Fire Safety Ltd | Dartford | 2023 |
| Kent Medical Ultrasound Ltd | West Malling | 2024 |
| Kent Resuscitation Training Ltd | Birchington | 2026 |
| Kent With Ukraine Ltd | London | 2026 |
| Kenyon International Emergency Services Limited | Doncaster | 2014 |
| Kenzomayor Ltd | Stalmine Poulton Le Fylde | 2022 |
| Keren Jackson PA Services Limited | Birmingham | 2019 |
| Kernohan Fire Safety Consultancy Limited | Halesowen | 2010 |
| Kerr Fire Protection Limited | Leeds | 2005 |
| Kerr Strategic Consultancy Ltd | Musselburgh | 2024 |
| Kerry Healthcare Ltd | Ashford | 2024 |
| Kerrycare Commissioning Limited | Warrington | 2023 |
| Kesja's Health Care Services Ltd | Luton | 2019 |
| Keskem Limited | Erith | 2022 |
| Kettle and Ward Physiotherapy and Sports Massage Ltd | Belfast | 2025 |
| Kevin Parker TM Ltd | Doncaster | 2024 |
| Key Fire Doors Limited | Hornchurch | 2024 |
| Key Fire Ltd | Chester Le Street | 2025 |
| Key Worker Specialist Services Ltd | London | 2024 |
| Keylam Safety Limited | Llantwit Major | 2024 |
| Keynes Care Services Limited | Milton Keynes | 2017 |
| KEZ MAC Ltd | Middlesbrough | 2026 |
| KF Dimensions Ltd | Worthing | 2023 |
| KFC (Kent Fire Consultants) Limited | Northampton | 2014 |
| KG Safeguarding & Professional Services Ltd | Chepstow | 2025 |
| KH Fire Protection Ltd | Dalkeith | 2022 |
| Khan Trademagnate OPC Private UK Limited | London | 2026 |
| Khor ENG Suan Ltd | Edgware | 2015 |
| Khumz Limited | Cradley Heath | 2022 |
| Khye Fire Ltd | Croydon | 2020 |
| Kiai Advisors Limited | Bedford | 2019 |
| KIB Healthcare Training Ltd | Birmingham | 2023 |
| Kiddaz Ltd | Dudley | 2019 |
| KILBURN4LIFE Ltd | Buckingham | 2022 |
| Killed Women | London | 2023 |
| Kilo 6 Limited | Milton Keynes | 2023 |
| Kilo Oscar Medical & Rescue Services Ltd. | Chepstow | 2024 |
| KIM Chapman PA Services Limited | Hook | 2013 |
| Kimari Consulting Ltd | Exeter | 2025 |
| Kimmik Ltd | Durham | 2025 |
| Kimuli and Sons Limited | East Ham | 2019 |
| Kincur Ltd | Edinburgh | 2022 |
| Kind Healthcare Ltd | Nottingham | 2021 |
| Kind Hearts Care Company Ltd | Woking | 2020 |
| Kind Hearts Home Care Ltd | Leicester | 2025 |
| Kind Tailored Care Ltd | Chepstow | 2021 |
| KIND1 Counselling and Mental Wellbeing CIC | Stafford | 2025 |
| Kindersley Research Limited | Cardiff | 2016 |
| Kindheart Care Limited | Liverpool | 2025 |
| Kindmind Support Services Ltd | Cowes | 2025 |
| Kindnest Care Limited | Enfield | 2024 |
| Kindnest Care Services Ltd | London | 2025 |
| Kindred Knowledge Ltd | London | 2026 |
| Kindred Well Healthcare Limited | Nottingham | 2025 |
| Kinected Solutions Limited | Fordingbridge | 2016 |
| Kinetic Freedom Limited | Ross-On-Wye | 2017 |
| King Bamford Psychotherapy Ltd | Mildenhall | 2025 |
| Kingdom Fire Services Ltd | Brighton | 2018 |
| Kingfisher Care Services York Ltd | York | 2025 |
| Kings Fire Doors Ltd | Ampthill | 2022 |
| Kings Reach Trading Limited | Lancing | 2003 |
| Kingswinford Fire Protection Limited | Kingswinford | 2002 |
| Kinsella Clarke Executors Limited | Bootle | 2013 |
| Kinshipcare Plus Ltd | London | 2023 |
| Kiran Foundation | Harrow | 2021 |
| Kirsty Spain Limited | South Chailey | 2023 |
| Kirthar Limited | Sheffield | 2023 |
| Kirwin Davies Foundation | Shaftesbury | 2017 |
| Kitchen Originals Limited | Ditchling | 2025 |
| KJ Operational Management Services Limited | Peterborough | 2023 |