| Jubei Music Limited | Arts & recreation | 2015 |
| Jubilee 77 Social Club Limited | Other services | 1987 |
| Judith's Home Help Ltd | Other services | 2019 |
| Julian Thomas Ltd | Professional & scientific | 2011 |
| Jump 7 London Limited | Wholesale & retail | 2014 |
| Junction Securities Ltd | Financial services | 2021 |
| Jungle Shorts Limited | Wholesale & retail | 2014 |
| Juno Fleet Services Ltd | Professional & scientific | 2018 |
| Just Ride Bikes Ltd | Information & communication | 2020 |
| Justin Ayton Limited | Professional & scientific | 2013 |
| Justnetuk Ltd | Wholesale & retail | 2025 |
| JVF Property Holding Limited | Real estate | 2018 |
| JWB Design Limited | Professional & scientific | 2008 |
| K & J Pegler Catering Ltd | Wholesale & retail | 2014 |
| K P Gates Limited | Administrative & support | 2021 |
| K Spec Solutions Ltd | Construction | 2008 |
| K9 Trail Time Ltd | Wholesale & retail | 2017 |
| KAE Property Solutions Ltd | Real estate | 2023 |
| Kapas Consultancy Ltd | Professional & scientific | 2017 |
| Kate Prance Limited | Other services | 2024 |
| Katharine Fortescue Limited | Other services | 1987 |
| Katmai Solutions Ltd | Professional & scientific | 2011 |
| KC Builders Ltd | Construction | 2023 |
| KDC Consulting Limited | Information & communication | 2008 |
| Keely Homes Limited | Construction | 2006 |
| Keepers Gate Management Company Limited | Professional & scientific | 2006 |
| Kelvin Brett Johnson Ltd | Agriculture & fishing | 2019 |
| Kelvin House Residents Association Limited | Households | 2012 |
| Kemble 1 (Cirencester) Management Company Limited | Other services | 1988 |
| Kemble 3 (Cirencester) Management Company Limited | Households | 2008 |
| Kemble Air Services Limited | Administrative & support | 2001 |
| Kemble Airfield Estates Limited | Real estate | 1999 |
| Kemble Farms Limited | Agriculture & fishing | 1997 |
| Kemble Flying Centre Ltd | Education | 2012 |
| Kemble Flying Club Ltd | Administrative & support | 2013 |
| Kentish Town Brewery Limited | Manufacturing | 2016 |
| Keys to the Cotswolds Ltd | Real estate | 2026 |
| Keyser Contracting Ltd | Agriculture & fishing | 2014 |
| Keyser Limited | Manufacturing | 2011 |
| Keystone Property Maintenance Limited | Construction | 2023 |
| Kiama Ventures Ltd | Real estate | 2021 |
| Kickstart Support Ltd | Administrative & support | 2017 |
| Kiki Kirby Limited | Other services | 2015 |
| Kilkenny Farm Properties Limited | Real estate | 2022 |
| Kilpatrick T Limited | Arts & recreation | 2020 |
| King Construction Consultants Limited | Construction | 2012 |
| King George's Field Management Limited | Extraterritorial | 2016 |
| Kings Owen Limited | Real estate | 2003 |
| Kings Residential Real Estate Ltd | Real estate | 2024 |
| Kingsbeech Limited | Wholesale & retail | 1994 |
| Kingsley & Co London Limited | Wholesale & retail | 2025 |
| Kinn & Partners LLP | | 2024 |
| Kinn & Partners UK Ltd | Real estate | 2024 |
| Kirk Consultancy Services Ltd | Professional & scientific | 2022 |
| KIT for Sport Limited | Arts & recreation | 2016 |
| Kite Communications Limited | Financial services | 2000 |
| Kite Marketing Ltd. | Professional & scientific | 2013 |
| Kiwi Property Partners Ltd | Real estate | 2026 |
| KJL Consulting (Coln) Ltd | Public administration | 2012 |
| KLR Construction Consultants Limited | Professional & scientific | 2026 |
| KMB Engineering Limited | Manufacturing | 2015 |
| KN General Ltd | Professional & scientific | 2016 |
| Knead Bakery (Cirencester) Limited | Wholesale & retail | 2021 |
| Knead Bakery (Elkstone) Ltd | Wholesale & retail | 2022 |
| Knowatt Limited | Manufacturing | 2023 |
| Kokoro Health Limited | Health & social care | 2024 |
| Komfee-Kard Limited | Professional & scientific | 2011 |
| Kopykat Marketing & Communications Ltd | Professional & scientific | 2020 |
| Koze Group Ltd | Construction | 2013 |
| Koze Home Ltd | Financial services | 2017 |
| Koze Limited | Construction | 2019 |
| KPC Property Ltd | Real estate | 2022 |
| KPC Signalling Design Solutions Ltd | Professional & scientific | 2014 |
| Ksobitech Ltd | Wholesale & retail | 2022 |
| Kubus Group Limited | Wholesale & retail | 2001 |
| Kubus Holdings Limited | Financial services | 2022 |
| Kushwaha Elite Properties Ltd | Hospitality | 2025 |
| Kuwexa Ltd | Wholesale & retail | 2025 |
| Kyte Baby Ltd | Wholesale & retail | 2023 |
| Kyzmet Ltd | Wholesale & retail | 2025 |
| L Ellis Property Ltd | Real estate | 2025 |
| L R Engineering (Fairford) Ltd | Professional & scientific | 2012 |
| LA Consultancy (London) Limited | Real estate | 2010 |
| LA Salernitana Ltd | Hospitality | 2026 |
| LAB 1 Limited | Information & communication | 2019 |
| LAC Wiltshire Limited | Health & social care | 2022 |
| Lacey Books Ltd | Wholesale & retail | 2013 |
| Lake Edge Ltd. | Construction | 2017 |
| Lake Pochard Management Limited | Hospitality | 2013 |
| Lakeside Brasserie Limited | Hospitality | 2009 |
| Lakeside Escapes Ltd | Hospitality | 2025 |
| Lakeside Lunchbox Ltd | Hospitality | 2026 |
| Lakeside Sparkles Ltd | Administrative & support | 2025 |
| Lakeside Technical Limited | Professional & scientific | 2016 |
| Landings Lake Management Company Limited | Professional & scientific | 2012 |
| Langridges (Cotswolds) LLP | | 2026 |
| Lanocalm Ltd | Wholesale & retail | 2021 |
| Largo Jackson and Partners Limited | Administrative & support | 2014 |
| Latchaid Ltd | Information & communication | 2018 |
| Launchmark International Limited | Water & waste | 1980 |