| Holcombe Autos Ltd | Wholesale & retail | 2024 |
| Hold Fast Barbers Ltd | Other services | 2023 |
| Holiday Marketplace Ltd | Extraterritorial | 2020 |
| Hollie James Independent Funeral Directors Ltd | Other services | 2023 |
| Home ARC Ltd | Construction | 2021 |
| Home Farm Cottages Limited | Hospitality | 2021 |
| Homexpress Direct Ltd | Wholesale & retail | 2002 |
| Hope House Developments Limited | Construction | 2022 |
| Hour 25 Limited | Administrative & support | 2016 |
| Housekeepers Inc Ltd | Administrative & support | 2003 |
| Howerd Travel Ltd | Administrative & support | 2019 |
| HTC Transport & Recovery Ltd | Transport & logistics | 2023 |
| Huggenkiss Bakery Limited | Manufacturing | 2023 |
| Hungary Education Gateway Ltd | Education | 2024 |
| Hunt & Kelly Property Ltd | Real estate | 2019 |
| Hunter Rhodes Property Maintenance Limited | Construction | 2017 |
| Huntersway Landscaping & Maintenance Limited | Administrative & support | 1997 |
| Hy-Save (UK) Limited | Energy | 1998 |
| Hy-Save Technologies Limited | Construction | 2015 |
| Hyperblast Limited | Other services | 2009 |
| I Know a Mann Ltd | Professional & scientific | 2024 |
| I Strachan Management Services Ltd | Professional & scientific | 2022 |
| IAN Hobbs Technical Services Limited | Construction | 1993 |
| IAN Macdonald Insurance Services Ltd | Financial services | 1981 |
| Iaupro Consultancy Limited | Professional & scientific | 2003 |
| Iford Manor Shoot Ltd | Arts & recreation | 2018 |
| Ignis Safe Ltd | Public administration | 2026 |
| Ignis Stoves Ltd | Construction | 2022 |
| Ignyte Creative Limited | Professional & scientific | 2015 |
| Ignyte Limited | Professional & scientific | 2010 |
| Ignyte Media Limited | Information & communication | 2015 |
| Igselectronics Ltd | Manufacturing | 2017 |
| ILS Property Management Ltd | Real estate | 2023 |
| Imagestor Limited | Information & communication | 2013 |
| Improvement Solutions Limited | Professional & scientific | 1999 |
| Inanest Limited | Real estate | 2025 |
| Incursion Cyber Security Ltd | Information & communication | 2022 |
| Indalo Digital Ltd | Information & communication | 2023 |
| Industrial Pipe and Steam Services Limited | Construction | 2017 |
| Info-Source Publishing Limited | Professional & scientific | 2003 |
| Ingenious Homes (SW) Limited | Real estate | 2020 |
| Ingenious Performance Limited | Professional & scientific | 2013 |
| Inglenook Primrose Lane Management Company Limited | Households | 2013 |
| Inner Beauty Salons Ltd | Other services | 2007 |
| Insource Consulting Limited | Professional & scientific | 2018 |
| Inspirade Ltd | Education | 2024 |
| Ionita & Sons Ltd | Other services | 2025 |
| Island Court (MSN) Management Company Limited | Administrative & support | 1987 |
| Island Mill Court Management Company Limited | Households | 2002 |
| Ismail Chillies Limited | Hospitality | 2018 |
| Ivdx Holdings Limited | Real estate | 2021 |
| J & AC Property Development Limited | Construction | 2014 |
| J & J Mitchell Cottles Bath Limited | Wholesale & retail | 2010 |
| J & Q Auto Repairs Ltd | Wholesale & retail | 2023 |
| J & S Taylor (Bath) Ltd | Administrative & support | 2022 |
| J Bawden Plant Limited | Wholesale & retail | 2021 |
| J Coles Engineering Ltd | Professional & scientific | 2021 |
| J Coles Ltd | Professional & scientific | 2024 |
| J Hemmings Electrical Services Limited | Construction | 2023 |
| J L Bryant Services Ltd | Transport & logistics | 2018 |
| J M Brown Plumbing and Heating Ltd | Construction | 2013 |
| J M Compliance Limited | Professional & scientific | 2018 |
| J Plenty Ltd | Education | 2025 |
| J Rupprich Plastering and Rendering Limited | Construction | 2018 |
| J Swift Plumbing Services Ltd | Construction | 2025 |
| J. Alderman Limited | Construction | 2001 |
| J.A.S. Brake Limited | Wholesale & retail | 2016 |
| J.B. Davis Limited | Agriculture & fishing | 1997 |
| J.C.G Electrical Limited | Construction | 2004 |
| J.J. Saunders Limited | Real estate | 1969 |
| J.Price(Bath)Limited | Manufacturing | 1947 |
| J.R. Goold Steam Limited | Manufacturing | 1996 |
| Jacarandas Limited | Hospitality | 2005 |
| Jack and Harry's Ltd | Other services | 2014 |
| Jack Commercial Ltd | Real estate | 2022 |
| Jack Henri Limited | Professional & scientific | 2024 |
| Jack Shellard-Young Ltd | Other services | 2023 |
| Jackie Chan Catering Ltd | Hospitality | 2025 |
| Jackson & DIX Roofing Ltd | Construction | 2021 |
| Jacksons Properties Bath Ltd | Real estate | 2021 |
| Jacw Limited | Wholesale & retail | 2026 |
| Jalitose Holdings Limited | Real estate | 2020 |
| JAM Works UK Limited | Information & communication | 2005 |
| James Christopher Hairdressing Limited | Other services | 2005 |
| James Jefferies General Building Limited | Construction | 2009 |
| Jamie Crawford Heating Ltd | Construction | 2014 |
| Jamie Keel Hairdressing Limited | Other services | 2015 |
| Jamieson&Co Ltd | Administrative & support | 2024 |
| Jane Branson Learning Limited | Education | 2015 |
| Jason's Windows Limited | Construction | 2017 |
| Jaupaj Properties Limited | Real estate | 2026 |
| JB Autos Radstock Ltd | Wholesale & retail | 2017 |
| JB Cars Limited | Wholesale & retail | 2025 |
| Jefferson Consultancy Ltd | Other services | 2024 |
| Jeja Investments | Professional & scientific | 2025 |
| Jeremy Knight Consulting Ltd | Professional & scientific | 2015 |
| Jerry Minibus Taxis Ltd | Transport & logistics | 2025 |
| Jesse Loncraine Creative Limited | Arts & recreation | 2023 |
| Jgtees Cleaning Services Ltd | Administrative & support | 2023 |
| JJ Chirove Ltd | Health & social care | 2018 |