| K9CC Ltd | Aberdeen | 2015 |
| K9KUTZ Ltd | Enniskillen | 2024 |
| KA Agri Ltd | Welshpool | 2014 |
| KA Equestrian Limited | Falkirk | 2024 |
| Ka-Zoo Sussex Ltd | Pevensey Bay | 2022 |
| KAA Service and Support Limited | London | 2020 |
| Kabaghe Enterprise Ltd | Thrapston | 2014 |
| Kabiyesi Shipping Lines Limited | Slough | 1997 |
| Kabokane K9 Services Ltd | Pontypool | 2025 |
| KADAK9 Ltd | Nottingham | 2021 |
| Kadaknath Rare Bird Co. Ltd | Berkhamsted | 2025 |
| Kaddy-King Limited | Coventry | 2000 |
| KAG Property Developments Ltd | Fareham | 2020 |
| Kaiapoi Consulting Ltd | Ware | 2013 |
| Kaimoana Limited | Devon | 2003 |
| Kaisl Ltd | Thornton-Cleveleys | 2025 |
| Kajaki K9 Ltd | London | 2026 |
| KAL Farms Ltd | Tighnabruaich | 2021 |
| Kalagra Limited | Leigh-On-Sea | 2016 |
| Kaleb Cooper Contracting Limited | Witney | 2021 |
| Kaleen Fishing Company Limited | Aberdeenshire | 2002 |
| Kalji Limited | Bedfordshire | 2002 |
| Kalkowski Forestry Services Ltd | Nottingham | 2023 |
| Kallin Shellfish Limited | Isle Of North Uist | 2003 |
| Kalpa Alpaca Ltd. | Lincoln | 2023 |
| Kaluun Limited | London | 2025 |
| Kaly Group Limited | Isle Of Skye | 2022 |
| KAM Waters Ltd | Derry | 2017 |
| Kama NSI UK Ltd | London | 2024 |
| Kamal Farms Limited | Waltham Cross | 2026 |
| Kamela International (Israel) Chemical Co., Ltd | West Midlands, England | 2023 |
| Kames Dairies Limited | Kelso | 1994 |
| Kames Fish Farming Limited | Argyll | 1972 |
| Kams Tree Care Ltd | Northampton | 2018 |
| Kanadevia Inova Waverley Farm Contracts Ltd | Edinburgh | 2009 |
| Kanara Fishery Ltd | Eastleigh | 2017 |
| Kanco Limited | Leominster | 1999 |
| Kane Agri Ltd | Kilmore | 2024 |
| Kane Bros Limited | Loughgall | 2014 |
| Kane Farms Limited | Ballyclare | 2017 |
| Kane Global Bloodstock Limited | Newry | 2024 |
| Kapiti Climate Insights Limited | London | 2024 |
| Karbnz Cachoeira Ltd | Stevenage | 2025 |
| Karbon Lite Ltd | Wick | 2026 |
| Karecole Farm Stables Ltd. | Edinburgh | 2013 |
| Karenswood (International) Limited | Alvechurch | 1982 |
| Karianca Limited | Winchester | 1974 |
| Karim's Fallen Stock Ltd | Ashford | 2018 |
| Karina Bakery Ltd | Coventry | 2025 |
| Karina Equestrian Limited | 31 King Street West | 1983 |
| Karisi Limited | Leighton Buzzard | 2022 |
| Karl's K9 Ltd | Castleford | 2025 |
| Karlo Dog Limited | Warrington | 2025 |
| Karmafield Limited | Halesworth | 2005 |
| Karmunity Ltd | Cambridge | 2022 |
| Karnak K9 Ltd | Dumfries | 2026 |
| Karnya Limited | Waltham Abbey | 2021 |
| Karocolin Limited | Spalding | 2018 |
| Karongwe Limited | Milton Keynes | 2022 |
| Karsten UK Limited | Spalding | 2003 |
| Karti Shipping Limited | London | 2020 |
| KAS Farms Ltd | Newry | 2017 |
| Kashmir Farm Ltd | Middlesbrough | 2020 |
| Kashore Limited | London | 2005 |
| Kaspersocks Ltd | London | 2026 |
| Kast Fisheries Limited | Ashford | 2014 |
| Kastelruth Racing and Breeding Limited | Edinburgh | 2001 |
| Kastle Rock Resource Limited | Coventry | 2024 |
| KAT Agricultural Services Ltd | Market Rasen | 2024 |
| KAT Farm Services Limited | Barnard Castle | 2019 |
| Kat's Dogs Training Ltd | York | 2022 |
| Katam Compliance Services Ltd | Bishop Auckland | 2023 |
| Kate Rowe Eventing Ltd | Tetbury | 2021 |
| Kate's K9S Ltd | Hatfield | 2026 |
| Kater 1 Ltd | Fraserburgh | 2003 |
| Katesbridge PIG Farm Ltd | Banbridge | 2020 |
| Kate’S K9 Crew Ltd | Tonypandy | 2025 |
| Kathleen ANN Limited | Fraserburgh | 2018 |
| Katrina Bryant Limited | Lytham St. Annes | 2022 |
| Kavalan Conservation Ltd | Horsham | 2021 |
| KAW Productions Ltd. | Fordingbridge | 2022 |
| Kawunga Limited | Hull | 2025 |
| Kaya Alpacas Ltd | Newbury | 2025 |
| Kaydon Group Ltd | Melksham | 2023 |
| Kaye Contracting Ltd | Scunthorpe | 2025 |
| Kaye Livestock Limited | Chorley | 2009 |
| Kaylana Fishing Limited | Stornoway | 2018 |
| Kayle at Home Ltd | Willenhall | 2023 |
| Kayley Woollacott Racing Ltd | Crewkerne | 2019 |
| Kazs Logs Ltd | Stoke-On-Trent | 2016 |
| KB 100 Ltd | Waltham Abbey | 2019 |
| KB Farms Ltd | Aughnacloy | 2013 |
| KB Harvesting Ltd. | Dalkeith | 2012 |
| KB Livery Yard Ltd | Lymm | 2018 |
| KB67 Ltd | London | 2023 |
| KBC International Limited | London | 2018 |
| Kbly Ltd | London | 2025 |
| KBS Dog Walk and Pet Sitting Ltd | Bristol | 2023 |
| KC Agri Services Limited | North Kessock | 2022 |
| KC Eventing Ltd | Winchester | 2013 |