| Home Insites South Ltd | Construction | 2026 |
| Homepoise Limited | Education | 2026 |
| Homes Updated Limited | Real estate | 2021 |
| Hook to Plate Ltd | Manufacturing | 2024 |
| Horizon Forklifts & Plant Ltd | Other services | 2022 |
| Horizon Homes (Dorset) Ltd | Construction | 2013 |
| Horton Hotel Limited | Hospitality | 2020 |
| HOS Holdings Limited | Professional & scientific | 1996 |
| Hotel Hardwicke Ltd | Hospitality | 2019 |
| House M@Fia Ltd | Arts & recreation | 2024 |
| House MI Ltd | Real estate | 2025 |
| Howard & Dean Homes Ltd | Construction | 2025 |
| Howard Empson Thatching Ltd | Construction | 2023 |
| Howard Hughes Consulting Limited | Construction | 2013 |
| Howson Pools Limited | Construction | 2005 |
| HP Music Limited | Professional & scientific | 2016 |
| HP Sync Limited | Information & communication | 2025 |
| HPC Property Ltd | Real estate | 2026 |
| HRG Land Developments Ltd | Real estate | 2021 |
| HRG Services Ltd | Other services | 2014 |
| HRW (Midlands) Ltd | Real estate | 2024 |
| HS Enterprise (Shipley) Limited | Wholesale & retail | 2020 |
| HS Healthcare Ltd | Health & social care | 2021 |
| Hub Accountants Ltd | Professional & scientific | 2007 |
| Hurn Lodge Kennels and Cattery Limited | Other services | 2025 |
| Hustle Homes Ltd | Construction | 2017 |
| Huyana Beauty Limited | Other services | 2023 |
| Huyana Beauty Studio Limited | Other services | 2025 |
| Hyde Band | Arts & recreation | 1996 |
| I GOT That Crystal Healing Ltd | Other services | 2020 |
| I.C.M. Property Services Limited | Real estate | 2003 |
| Iam-Nu Ltd | Professional & scientific | 2025 |
| Ibsley Design Services Limited | Professional & scientific | 2014 |
| Ibsley Service Station Limited | Wholesale & retail | 1976 |
| Icare Holdings Limited | Information & communication | 2017 |
| ICM Examining Services Limited | Education | 1994 |
| Idelica Limited | Wholesale & retail | 2006 |
| Iford 154 Limited | Construction | 2019 |
| Iftikhar Meat and Vegetable Shop Limited | Wholesale & retail | 2019 |
| Illuminar Clinic Ltd | Health & social care | 2025 |
| Illusion Aesthetics Ltd | Other services | 2024 |
| Illusion Laser Clinic Ltd | Other services | 2024 |
| Imagine Broadband (USA) Limited | Professional & scientific | 2000 |
| Impact Travel Group Ltd | Financial services | 2026 |
| IN Home Construction Ltd | Manufacturing | 2026 |
| Inca Cloud Limited | Information & communication | 2017 |
| Inception Landscapes Limited | Administrative & support | 2022 |
| INDIGO5 Limited | Administrative & support | 2011 |
| Indra Harsh Limited | Hospitality | 2012 |
| Industrial Abrasives Limited | Manufacturing | 1980 |
| Industry Leads Ltd | Other services | 2026 |
| Infinergy Advanced Assets Limited | Construction | 2022 |
| Infragroup Limited | Wholesale & retail | 2013 |
| Infusion Multimedia Limited | Information & communication | 1999 |
| Ingleby (1895) Limited | Professional & scientific | 2012 |
| Inglefield Davis Property Ltd | Real estate | 2025 |
| Initiate Legal Limited | Professional & scientific | 2023 |
| Inkwazi Kommunications Limited | Professional & scientific | 2013 |
| Innodata Europe Limited | Information & communication | 2005 |
| Innodata Global Holdings Limited | Information & communication | 2016 |
| INNOV8 Social Ltd | Information & communication | 2022 |
| Innsouth Ltd | Hospitality | 2009 |
| Inreadiness Ltd | Health & social care | 2004 |
| Inspired Loans Ltd | Financial services | 2010 |
| Inspiring Pet Teaching Limited | Professional & scientific | 2024 |
| Instachem Limited | Wholesale & retail | 2009 |
| Integral Storage Systems Installations Ltd. | Construction | 2014 |
| Integriphy Limited | Professional & scientific | 2024 |
| Integrity Investment Solutions Ltd | Professional & scientific | 2021 |
| Intelligent Advisory Services Limited | Financial services | 2011 |
| Interactive English Language School Ltd | Education | 2010 |
| International Business Media Services Limited | Administrative & support | 2006 |
| Internet Business Specialists Limited | Information & communication | 2012 |
| Internet Express (UK) Ltd | Wholesale & retail | 2011 |
| Intuitiks Ltd | Other services | 2009 |
| Investment Analysis Limited | Information & communication | 1989 |
| IQ Business Consulting Ltd | Professional & scientific | 2020 |
| Irrigation Professionals Limited | Professional & scientific | 2024 |
| Isis Coachworks Limited | Wholesale & retail | 2014 |
| Isla Freyja Ltd | Real estate | 2022 |
| Island's View (Management) Limited | Households | 1977 |
| ISO South West Limited | Professional & scientific | 2021 |
| Isys Systems (Ringwood) Limited | Information & communication | 2000 |
| Itizu Ltd. | Information & communication | 2012 |
| Iuvo Consulting Ltd | Professional & scientific | 2014 |
| J & a Drinks Limited | Wholesale & retail | 2011 |
| J & R Jewellery Limited | Other services | 2013 |
| J & S Houses Limited | Real estate | 2015 |
| J and R Properties ( Bournemouth ) Ltd | Professional & scientific | 1993 |
| J Beavers Limited | Wholesale & retail | 2003 |
| J C W Commercials Ltd | Transport & logistics | 2020 |
| J G Fabrications and Erection Services Ltd | Manufacturing | 2018 |
| J Gibson Accountants Limited | Professional & scientific | 2026 |
| J Hicks Consultancy Limited | Information & communication | 2024 |
| J N Surveying Limited | Professional & scientific | 2025 |
| J P Stevens Ltd | Other services | 2011 |
| J T H Investments Limited | Real estate | 2021 |
| J&A Horton Property Solutions Ltd | Real estate | 2026 |
| J. Hickey & Sons Ltd | Professional & scientific | 2021 |
| Jack Routledge Ltd | Other services | 2021 |