| Hillside Partners Limited | Professional & scientific | 2011 |
| HIT and Hope Productions Ltd | Professional & scientific | 2025 |
| Hjmp Flooring Ltd. | Wholesale & retail | 2020 |
| HJW Homes Ltd | Real estate | 2023 |
| HLR1771 Consulting Ltd | Information & communication | 2024 |
| Hnsn Consulting Ltd | Professional & scientific | 2025 |
| Hoff Aviation Ltd | Transport & logistics | 2007 |
| Holbrook International Trading Limited | Transport & logistics | 2024 |
| Holly Court (Simplemarsh) Residents Association Limited | Households | 2017 |
| Holness 19 Consultancy Limited | Administrative & support | 2013 |
| Holy Shift Ltd | Other services | 2023 |
| Hombre International Ltd | Wholesale & retail | 2020 |
| Home From Home Children's Day Care Ltd | Education | 2011 |
| Home Sound UK Ltd | Health & social care | 2026 |
| Homeshare Solutions Limited | Extraterritorial | 2013 |
| Homeshield Insulation Services Limited | Construction | 2026 |
| Homey Accommodation Ltd | Real estate | 2023 |
| Homiqo Ltd | Wholesale & retail | 2025 |
| Honeysuckle Ltd | Real estate | 2018 |
| Hongsa Ltd | Information & communication | 2023 |
| Hope in Hands Limited | Health & social care | 2019 |
| Horizon Pools Limited | Construction | 2018 |
| Houghton Accounting Services Ltd | Professional & scientific | 2012 |
| House of Alisha Ltd | Other services | 2025 |
| HQA Property Management Ltd | Real estate | 2020 |
| Hsamuel Solutions Limited | Health & social care | 2018 |
| Htlandcreations Ltd | Administrative & support | 2018 |
| Hts-Tentiq Limited | Construction | 2019 |
| Hugo Anderson Brewing Limited | Manufacturing | 2019 |
| Hummingbird Optical Limited | Health & social care | 2017 |
| Hunter Consultation Services Limited | Professional & scientific | 2014 |
| Hunts Grove Management Company Limited | Households | 2010 |
| Hussar of London Ltd | Construction | 2015 |
| Hyab Limited | Real estate | 2024 |
| Hydro Eden Ltd | Wholesale & retail | 2020 |
| Hygge Park (Keynsham) Management Company Limited | Households | 2018 |
| Hyper Secure Networks Ltd | Information & communication | 2024 |
| I Pro Hire Limited | Administrative & support | 2024 |
| I R Flindall Ltd | Wholesale & retail | 2022 |
| I Van Express Ltd | Transport & logistics | 2023 |
| I-Klarity Video Solutions Limited | Information & communication | 2011 |
| Iamy Ltd | Wholesale & retail | 2023 |
| IB5 Limited | Professional & scientific | 2016 |
| Ibis Optical Ltd | Wholesale & retail | 2026 |
| ICS Surrey Ltd | Transport & logistics | 2025 |
| Icse Consult Limited | Construction | 2019 |
| ID Burger Limited | Hospitality | 2025 |
| ID Industrial Cranes Services Ltd | Professional & scientific | 2019 |
| Idani Ventures Ltd | Transport & logistics | 2025 |
| Iftg Ltd | Professional & scientific | 2024 |
| IGD Lofts and Extensions Ltd | Construction | 2021 |
| Ikertu Limited | Arts & recreation | 2014 |
| Ikin Gastroenterology Services Ltd | Health & social care | 2021 |
| Ilovan Limited | Wholesale & retail | 2025 |
| ILUV2FLY Ltd | Education | 2025 |
| IM Car House Limited | Wholesale & retail | 2025 |
| Imac Logistics Ltd | Transport & logistics | 2010 |
| Imoden Media Ltd | Information & communication | 2022 |
| Incsi Ltd | Information & communication | 2017 |
| Independent Eyewear Ltd | Wholesale & retail | 2017 |
| Indigo Forward Limited | Extraterritorial | 2013 |
| Infinite Resolutions Limited | Information & communication | 2008 |
| Infinity&Sons Consulting UK Limited | Professional & scientific | 2024 |
| Ingress Construction Ltd. | Construction | 2016 |
| Ingress Homes Ltd | Real estate | 2023 |
| Initiator VC CIC | Financial services | 2024 |
| Innovation Stockley Limited | Wholesale & retail | 2017 |
| Inprotel Ltd | Administrative & support | 2025 |
| Insight Fusions Ltd | Professional & scientific | 2020 |
| Insight on Risk Ltd | Extraterritorial | 2008 |
| Inspired Woodwork of Cobham LLP | | 2024 |
| Inter-Concept Development Limited | Information & communication | 2011 |
| Interbuild Properties Limited | Construction | 1997 |
| Interglobe Enterprises (UK) Limited | Financial services | 2017 |
| Into Sound Ltd | Information & communication | 2024 |
| Iprotrades Ltd | Information & communication | 2025 |
| Iredam Ltd | Hospitality | 2023 |
| IRM Global Services Ltd | Administrative & support | 2024 |
| Islamabad Properties Ltd | Real estate | 2024 |
| ISOC360 Limited | Information & communication | 2015 |
| Italian Enterprises Limited | Hospitality | 2024 |
| J & a Holdings Limited | Professional & scientific | 2000 |
| J a F Joinery Ltd | Construction | 2013 |
| J Bench Props Limited | Information & communication | 2019 |
| J N R Plumbing & Heating Limited | Other services | 2006 |
| J P Collins Electrical Limited | Construction | 2003 |
| J P Groves Building and Maintenance Ltd | Construction | 2020 |
| J Quintana Limited | Professional & scientific | 2022 |
| J Whitfield Associates Limited | Professional & scientific | 2013 |
| J Wortley Rentals Limited | Real estate | 2023 |
| J Y Rentals LLP | | 2022 |
| J&O Groundworks Ltd | Construction | 2012 |
| Jaar Developments (an) Ltd | Construction | 2024 |
| Jaar Developments (FC) Ltd | Construction | 2024 |
| Jaar Developments (NW) Limited | Construction | 2023 |
| Jaar Developments (SJ) Ltd | Construction | 2024 |
| Jackson Consults Ltd | Administrative & support | 2021 |
| JAD Travels and Technologies Ltd | Administrative & support | 2020 |
| Jadeja Consulting Ltd | Information & communication | 2013 |
| James COX Plumbing and Heating Limited | Construction | 2013 |