| Heritage Garden Limited | Extraterritorial | 2015 |
| Hersey Social Ltd | Information & communication | 2026 |
| Hewell Taylor Freed & Associates Limited | Professional & scientific | 1998 |
| Highland Bay Limited | Extraterritorial | 2011 |
| Hive Business Limited | Professional & scientific | 2011 |
| HKM Aviation Training Limited | Other services | 2018 |
| Homecare Opticians Limited | Health & social care | 2006 |
| Hope Place Lettings Limited | Real estate | 2022 |
| Horace Group Ltd | Manufacturing | 2019 |
| Howe Family Property Investments Ltd | Real estate | 2024 |
| Howe Heating Services Ltd | Construction | 2023 |
| Hussain Media Limited | Manufacturing | 2021 |
| Hvac Consulting Ltd | Professional & scientific | 2022 |
| Hvac Management Limited | Professional & scientific | 2003 |
| HW2 Limited | Wholesale & retail | 2013 |
| HYPHEN19 Limited | Construction | 2021 |
| I.M.S.R . Property Limited | Real estate | 2024 |
| IAN Hamilton Engineering Limited | Manufacturing | 2002 |
| IAN Tandy Limited | Real estate | 2002 |
| Ianfrosteducation Ltd | Education | 2020 |
| Icloud Accounting Ltd | Extraterritorial | 2016 |
| Ideally Consulting Limited | Information & communication | 2014 |
| Ideology Consulting Limited | Professional & scientific | 2015 |
| Impact Capital Ltd | Professional & scientific | 2019 |
| IN3D Software Limited | Information & communication | 2014 |
| Inchbrook Garage Limited | Wholesale & retail | 2011 |
| IND Plumbing & Heating Limited | Construction | 2003 |
| Indah Air Limited | Transport & logistics | 2025 |
| Independent Aviation Consultants Limited | Other services | 2011 |
| Indigo Haus Ltd | Real estate | 2017 |
| Ingraham Trading Limited | Wholesale & retail | 2010 |
| Innervision Technology Ltd | Manufacturing | 2011 |
| Innovation Digital Assets Ltd | Information & communication | 2022 |
| Insight Medical Products Limited | Wholesale & retail | 2000 |
| Insight Survey Limited | Professional & scientific | 2020 |
| Inspiring Places (Placemaking Services) Limited | Administrative & support | 2019 |
| International Gains Ltd | Arts & recreation | 2024 |
| International Mould Tools Ltd | Other services | 2011 |
| Invision Marketing Limited | Professional & scientific | 2022 |
| Iskia Limited | Other services | 2016 |
| It's Aviation Ltd | Education | 2025 |
| IWS Aviation Ltd | Other services | 2018 |
| J & L Properties (Cotswolds) Limited | Construction | 2024 |
| J Bell & SON Farming Limited | Agriculture & fishing | 2011 |
| J C B Northern Lights Limited | Real estate | 2004 |
| J R Farriery Solutions Limited | Professional & scientific | 2023 |
| J R Voices Limited | Information & communication | 2013 |
| J.N. Boswell Limited | Construction | 2005 |
| Jach Management Ltd | Professional & scientific | 2013 |
| Jackaments Limited | Hospitality | 2025 |
| Jackson Tayler Limited | Arts & recreation | 2011 |
| James Johnson Frics Ltd | Professional & scientific | 2000 |
| James Randolph Rogers & Co. Limited | Manufacturing | 2018 |
| Jason Brown Consulting Ltd | Information & communication | 2018 |
| JAY City Parking Limited | Extraterritorial | 2017 |
| JAY Whittaker Limited | Administrative & support | 2009 |
| JCT Versatile Services Ltd | Professional & scientific | 2024 |
| Jessy Harrison PR Limited | Extraterritorial | 2025 |
| JHB GAY Limited | Agriculture & fishing | 2021 |
| JK Maison Limited | Construction | 2014 |
| JMA Cleaning Ltd | Administrative & support | 2025 |
| Joanna MAY Studio Gallery Limited | Administrative & support | 2004 |
| John Arthur Group Limited | Real estate | 2024 |
| John Rolfe Auctions Limited | Wholesale & retail | 2022 |
| Jones & Co Garden Rooms Ltd | Construction | 2026 |
| Jono J Developments Ltd | Construction | 2023 |
| Jordan Projects Management Limited | Administrative & support | 2017 |
| Jordan Property Management Limited | Real estate | 2013 |
| Josh Ponte Ltd | Information & communication | 2021 |
| Joshua Graces Ltd | Health & social care | 2019 |
| Jouel Ltd | Wholesale & retail | 2019 |
| Jpcp Properties Ltd | Real estate | 2024 |
| JRM Training Limited | Professional & scientific | 2002 |
| Jubilee Place (Tetbury) Management Company Limited | Households | 2022 |
| Juliet Russell HR Ltd | Professional & scientific | 2023 |
| Just Divine Aesthetics Ltd | Health & social care | 2022 |
| Just JOE Consulting Ltd | Information & communication | 2024 |
| Just Liquorice Limited | Wholesale & retail | 2008 |
| Just Nature Garden Company Limited | Agriculture & fishing | 2025 |
| JW Specialist Services Limited | Extraterritorial | 2017 |
| Katalista Trading Ltd | Financial services | 2026 |
| Kate Rowe Eventing Ltd | Agriculture & fishing | 2021 |
| Kathco Ltd | Real estate | 2016 |
| Katy-Ann Rowe Limited | Administrative & support | 2020 |
| Keiser UK Limited | Wholesale & retail | 2001 |
| Kernow Renewable Developments Ltd | Construction | 2022 |
| Kevin Plumb Consultancy Ltd | Construction | 2016 |
| Keystone Environmental Limited | Professional & scientific | 2002 |
| Keystone Executives Ltd | Administrative & support | 2025 |
| Khpr Limited | Professional & scientific | 2000 |
| Kings Tree Services Ltd | Agriculture & fishing | 2014 |
| Kingscote Barn Limited | Hospitality | 2012 |
| Kinkora Limited | Professional & scientific | 2018 |
| Kipling & Stokes Limited | Wholesale & retail | 2021 |
| KJW Engineering Ltd | Manufacturing | 2022 |
| Klasiko Ltd | Wholesale & retail | 2023 |
| Klasiko Storage Ltd | Transport & logistics | 2024 |
| KLG Advisory Services Ltd | Professional & scientific | 2019 |
| Klimny Ltd | Arts & recreation | 2014 |
| Kmil Ltd | Real estate | 2026 |