| Heywoof Ltd | Agriculture & fishing | 2024 |
| HI Tech Cars Ltd | Wholesale & retail | 2019 |
| Hilditch Construction Limited | Construction | 2013 |
| Hillbarn Sawmills Limited | Manufacturing | 2018 |
| Hire Standards Group Holdings Limited | Professional & scientific | 2020 |
| Hire Standards Limited | Administrative & support | 2013 |
| Holden Smith Limited | Real estate | 2011 |
| Holland Information Management Services Limited | Information & communication | 2015 |
| Holt Joinery Limited | Construction | 2003 |
| Home Elements Ltd | Real estate | 2026 |
| Home FIX Heating & Plumbing Services Ltd | Construction | 2020 |
| Honest Hospitality Limited | Professional & scientific | 2026 |
| Honeystone Consulting Limited | Information & communication | 2003 |
| Howse Building & Property Development Limited | Construction | 2023 |
| Htdent Ltd | Health & social care | 2017 |
| Hungry Brats Ltd | Hospitality | 2022 |
| Hussars Driver Coaching Ltd | Education | 2025 |
| HW Facilities Ltd | Extraterritorial | 2024 |
| Hymap Limited | Professional & scientific | 2009 |
| I Scaff Wilts Ltd | Construction | 2016 |
| I2C Solutions Limited | Information & communication | 2009 |
| Ibishi Ltd | Information & communication | 2004 |
| Icon South East Limited | Extraterritorial | 2020 |
| Imagine Coach-Mentoring and Consultancy Ltd | Other services | 2020 |
| Imaginory Limited | Information & communication | 2026 |
| Impartial Financial Management Limited | Financial services | 2012 |
| IMS K9 Security Ltd | Administrative & support | 2026 |
| Independently Major Ltd | Information & communication | 2022 |
| Innocent Products Limited | Wholesale & retail | 2015 |
| Inova Construction Ltd | Construction | 2018 |
| Inperium Ltd | Professional & scientific | 2012 |
| Inspire Business Group Limited | Administrative & support | 2020 |
| Institution of Engineering Designers (the) | Other services | 1974 |
| Intaclean Limited | | 1987 |
| International Breakers South West Limited | Wholesale & retail | 2023 |
| Invicta Car Manufacturing Limited | Administrative & support | 1989 |
| Invicta Cars Limited | Manufacturing | 2025 |
| Invicta GT Racing Ltd | Administrative & support | 2009 |
| Ironworx Performance Limited | Arts & recreation | 2018 |
| ISK Property and Investments Ltd | Real estate | 2020 |
| J Dell Builders Ltd | Construction | 2022 |
| J. L. Knight & SON Ltd | Construction | 2022 |
| Jackamber Ltd | Professional & scientific | 2023 |
| Jamie Adlam (2020) Ltd | Financial services | 2020 |
| Jamie Adlam Ltd | Wholesale & retail | 2014 |
| JAR Network Consultancy Ltd | Information & communication | 2025 |
| Jarp Properties Ltd | Real estate | 2022 |
| Jason Parmley Building Contractor Limited | Construction | 2018 |
| Jasper (Bath) Ltd | Other services | 2017 |
| Jasper Property Developments Limited | Construction | 2013 |
| Jates Electrical Services Limited | Construction | 2020 |
| Jb&Sb (Holdings) Limited | Administrative & support | 2001 |
| Jefferies Car Centre Limited | Wholesale & retail | 2011 |
| JEM Heating Services Limited | Construction | 2007 |
| Jfdl Trading Limited | Professional & scientific | 2014 |
| JHE Property Ltd | Real estate | 2021 |
| JLR Refrigeration Ltd | Construction | 2022 |
| Jlsd Services Ltd | Professional & scientific | 2020 |
| JML Pools Ltd | Other services | 2011 |
| JMP Health & Fitness Limited | Arts & recreation | 2016 |
| Join the Circle. Ltd. | Hospitality | 2019 |
| Jolly Friar II Limited | Hospitality | 2017 |
| Jomebelo Limited | Wholesale & retail | 2004 |
| JON William Stables Limited | Construction | 2009 |
| Jordan and Millie Limited | Professional & scientific | 2026 |
| Josh Carr Electrical Limited | Construction | 2017 |
| JS Auto Blaster Ltd | Wholesale & retail | 2020 |
| JTM Electrical Services Ltd | Construction | 2020 |
| JTT Management Limited | Construction | 2020 |
| JW Limited Company Ltd | Professional & scientific | 2021 |
| K Nails and Spa Ltd | Other services | 2025 |
| K2 Media Services Limited | Professional & scientific | 2005 |
| Karen Chilcott Limited | Extraterritorial | 2025 |
| Kawler Ltd | Information & communication | 2023 |
| Keogh Group Holdings Limited | Financial services | 2022 |
| Keogh Holdings Limited | Financial services | 2020 |
| Kernow HR Limited | Professional & scientific | 2015 |
| Kerry Chapman Limited | Wholesale & retail | 2013 |
| Kerry Johns Limited | Construction | 2013 |
| Kevin LEE Chilcott Limited | Extraterritorial | 2025 |
| KG Propco Ltd | Real estate | 2019 |
| Kings Motor Services Limited | Wholesale & retail | 2003 |
| Kinnective Limited | Professional & scientific | 2012 |
| KJS Specialist Driver Hire Ltd | Administrative & support | 2025 |
| KLP Fire Ltd | Construction | 2026 |
| KM Maintenance Solutions Ltd | Manufacturing | 2025 |
| KM Properties (Westbury) Ltd | Real estate | 1975 |
| KNS GAS and Heating Limited | Professional & scientific | 2008 |
| Kopiusnk Holdings Limited | Hospitality | 2024 |
| Kurrycity Limited | Hospitality | 2025 |
| Kuzeys Cafe Ltd | Hospitality | 2023 |
| L.B Consultancy Services Ltd | Professional & scientific | 2020 |
| L.H. Media Group Ltd | Information & communication | 2022 |
| L.S. Building Services Limited | Construction | 2008 |
| LA Developments International Ltd | Construction | 2016 |
| Lakp Ltd | Hospitality | 2025 |
| LAP Mortgage Management Ltd | Financial services | 2021 |
| Larkhall Property Ltd | Real estate | 2021 |
| Laverton Housing Trust | Real estate | 2006 |
| Lavish Blue Travel Ltd | Transport & logistics | 2025 |