| HR Go Recruitment (Hampshire) Limited | Professional & scientific | 2002 |
| HR Go Recruitment (Luton) Limited | Professional & scientific | 1998 |
| HR Go Recruitment (Occupational Health) Limited | Professional & scientific | 2001 |
| HR Go Recruitment (Payroll) Limited | Administrative & support | 2021 |
| HR Go Recruitment (Shepton Mallet) Ltd | Professional & scientific | 2006 |
| HR Go Recruitment (Sussex) Limited | Professional & scientific | 2007 |
| HR Go Recruitment (SW) Limited | Professional & scientific | 2006 |
| HR Go Recruitment (Technical Aviation) Limited | Professional & scientific | 2009 |
| HR Go Recruitment (Watford) Limited | Professional & scientific | 1995 |
| HR Go Recruitment Education (NW) Limited | Professional & scientific | 2006 |
| HR Go Recruitment Education (SE) Limited | Professional & scientific | 2005 |
| HR Go Recruitment Limited | Administrative & support | 2006 |
| HR Independent Financial Services Limited | Financial services | 1998 |
| HR Sandhu Construction Ltd | Construction | 2024 |
| HRB Installations Ltd. | Construction | 2011 |
| HRG Auto Centre Ltd | Wholesale & retail | 2025 |
| HRP Equestrian Ltd | Administrative & support | 2014 |
| Hrprism Ltd | Administrative & support | 2023 |
| Hrpropertycontractors Ltd | Real estate | 2026 |
| HRS County Ltd | Wholesale & retail | 2018 |
| HS Walnut Tree Limited | Hospitality | 2024 |
| Hsbj Limited | Extraterritorial | 1992 |
| HSG Homepro Ltd | Administrative & support | 2011 |
| HSK International Projects Limited | Information & communication | 2015 |
| Hsqa - Consultancy Ltd | Information & communication | 2011 |
| Hsqe Audit Ltd | Professional & scientific | 2022 |
| HSS Cars Ltd | Wholesale & retail | 2025 |
| Htrb Services Ltd | Manufacturing | 2024 |
| HTS Motorsport Limited | Wholesale & retail | 2012 |
| HTW PUB Co LLP | | 2024 |
| HU Digital Media Limited | Information & communication | 2013 |
| Hub Office Ltd | Professional & scientific | 2012 |
| Hubert Logistics and Data Security Ltd | Transport & logistics | 2021 |
| Huckleberry Homes Ltd | Real estate | 2021 |
| Hudson Capital Holdings Limited | Real estate | 2021 |
| Huggetts Properties Ltd | Real estate | 2025 |
| Hugh Martyn Ltd | Real estate | 2025 |
| Hughes Electrical (Kent) Ltd | Construction | 2024 |
| Hughes Heating Ltd | Construction | 2023 |
| Hughes Mini Services Ltd | Transport & logistics | 2019 |
| Hulbert Construction Management Limited | Professional & scientific | 2014 |
| Human Group Limited | Professional & scientific | 1998 |
| Humanix Limited | Professional & scientific | 2010 |
| Humphries Family Property Ltd | Real estate | 2024 |
| Hundal Logistics Ltd | Transport & logistics | 2018 |
| Hunt Ford & Co (Accountants) Ltd | Professional & scientific | 2003 |
| Hunter Oak Ltd | Professional & scientific | 2014 |
| Hunts Fencing Ltd | Manufacturing | 2015 |
| Hunts Homes Limited | Real estate | 2021 |
| Hurst Animal Health Ltd | Agriculture & fishing | 2015 |
| Hurston Eliot Ltd | Administrative & support | 2025 |
| Huse Solution Specialist Limited | Information & communication | 2025 |
| Hussey Enterprises Ltd | Wholesale & retail | 2024 |
| Huswist Limited | Construction | 2018 |
| Hutch Trading Ltd | Wholesale & retail | 2025 |
| Hutchell and Simpson Ltd | Real estate | 2021 |
| Hutzel Consulting Ltd | Professional & scientific | 2024 |
| Hvac Design Services Ltd | Professional & scientific | 2016 |
| HWA Scaffolding Limited | Construction | 2021 |
| HWD Home Care Limited | Wholesale & retail | 2016 |
| Hy-Tex (Investments) Limited | Real estate | 2016 |
| Hy-Tex (U.K.) Limited | Wholesale & retail | 1991 |
| Hybrid Electrical & Renewables Ltd | Construction | 2022 |
| Hyder South East Limited | Administrative & support | 2008 |
| Hydes Homes Ltd | Manufacturing | 2023 |
| Hydmech (UK) Ltd | Professional & scientific | 2022 |
| Hydrashine Exterior Cleaning Ltd | Construction | 2019 |
| Hydro Farmers Ltd | Administrative & support | 2017 |
| Hydro Grand Ltd | Construction | 2024 |
| Hydrobond Limited | Professional & scientific | 2005 |
| Hypercom Emea Ltd | Information & communication | 2004 |
| Hyperform Sport Horses Limited | Agriculture & fishing | 2019 |
| Hypergroup Limited | Professional & scientific | 2003 |
| Hypersonica Limited | Professional & scientific | 2025 |
| Hyprtrainer Ltd | Wholesale & retail | 2021 |
| Hyten Professional IT Services Limited | Information & communication | 2011 |
| Hythe Court Management Company Limited | Households | 1998 |
| I & J Bushell Limited | Agriculture & fishing | 2006 |
| I a Maitland & Sons Ltd | Construction | 2010 |
| I AM a Monster Films Limited | Information & communication | 2024 |
| I AM a Monster Holdings Limited | Information & communication | 2024 |
| I AM Natural Limited | Wholesale & retail | 2005 |
| I C Homes Limited | Construction | 2023 |
| I G Beauty Limited | Other services | 2024 |
| I L P Direct Limited | Manufacturing | 1997 |
| I Love This for YOU Limited | Wholesale & retail | 2013 |
| I M Specialist Services Ltd | Professional & scientific | 2018 |
| I Paint and Decorate Ltd | Construction | 2015 |
| I Want Cheap Energy Ltd | Energy | 2015 |
| I-Cert Electronic Certification Services Limited | Public administration | 2012 |
| I-Mo Electric Ltd | Construction | 2017 |
| I-Tides Services Ltd | Real estate | 2022 |
| I.B.S.S Limited | Health & social care | 2024 |
| I.G. Pilcher Limited | Other services | 2006 |
| I.T.H.T Limited | Information & communication | 2014 |
| Iamtux Limited | Professional & scientific | 2022 |
| IAN Bull Consultancy Limited | Real estate | 2013 |
| IAN GAY & SON Chimney Sweeps LLP | | 2022 |
| IAN Logan (Holdings) Limited | Arts & recreation | 1974 |
| IAN Upton Architects Limited | Professional & scientific | 2014 |