| Hyde Islamic Resource Centre | Hyde | 2007 |
| Hyde Leadership Consultancy Ltd | Market Harborough | 2025 |
| Hyde N Seek (Pinochios) Ltd | Strathaven | 2016 |
| Hyde Park Village Nursery Limited | Newbury | 2014 |
| Hyde Training Services (HTS) Ltd | Warrington | 2023 |
| Hyde-N-Seek (Bellshill) Ltd. | Glasgow | 2009 |
| Hyde-N-Seek Ltd. | Glasgow | 2001 |
| HYDE900 Limited | Winchester | 2006 |
| Hyder Foundation | London | 2016 |
| Hyderabad Deccan Community Association UK CIC | Birmingham | 2022 |
| Hydra Consulting (London) Limited | Chatteris | 2015 |
| Hydra Kids Limited | Sheffield | 2009 |
| Hydra Swim Academy Limited | Congleton | 2026 |
| Hydrai Systems Ltd | Blackburn | 2024 |
| Hydranet Total Solutions Limited | Coleford | 2011 |
| Hydro Academy Ltd | Manchester | 2025 |
| Hydro-Actif@Drummond Ltd | Maidenhead | 2020 |
| Hydro-X Training Limited | London | 2018 |
| Hydrogen Challenge Ltd | London | 2024 |
| Hydrogen Safe Limited | Barnet | 2023 |
| Hydrogen Training Limited | Orpington | 2025 |
| Hydrostem Ltd | Wimborne | 2024 |
| Hydroverse Ltd | London | 2025 |
| Hyfforddiant AOC Cyfyngedig / ALW Training Limited | Cardiff | 2025 |
| Hyfforddiant Enlli Training Ltd | Llandudno | 2021 |
| Hyfforddiant Menai Training Ltd | Bangor | 2024 |
| Hyfforddiant Parys Training Limited | Amlwch | 2003 |
| Hygeia Pilates and Wellness Limited | Kettering | 2024 |
| Hygge Education Limited | Peterborough | 2019 |
| Hygge Home ED C.I.C. | Preston | 2024 |
| Hygge House Nursery Ltd | Doncaster | 2024 |
| Hygge Life CIC | Rotherham | 2024 |
| Hygge Play Cafe Ltd | Birmingham | 2025 |
| Hygia Professional Training & Assessment Ltd | Durham | 2006 |
| HYL Leisure Ltd | Rhymney | 2017 |
| Hyland Childcare Limited | Liverpool | 2017 |
| Hyland House Nursery Ltd | Ilford | 2025 |
| Hylife Coaching Ltd | Sheffield | 2023 |
| Hylo Health Ltd | London | 2025 |
| Hylton Training Limited | Sunderland | 2014 |
| Hylton Tuition Centre Limited | Sunderland | 2026 |
| Hymers College Trustee Limited | East Yorkshire | 2004 |
| Hyndburn Hope Initiative CIC | Accrington | 2024 |
| Hyno Courses Ltd | Manchester | 2023 |
| Hynte Limited | Chigwell | 2012 |
| Hypatia Services Limited | London | 2019 |
| Hypatia Training Ltd | Liverpool | 2017 |
| Hype (Merseyside) Limited | Birkenhead | 2007 |
| Hype Dance Academy Ltd | Mildenhall | 2025 |
| Hyper Island Executive Education Limited | Manchester | 2013 |
| Hyperform Coaching Ltd | Redditch | 2025 |
| Hyperion College Ltd | Derby | 2024 |
| Hypernova (UK) Ltd | London | 2013 |
| Hyperscale Results Limited | Manchester | 2025 |
| Hyperspace Group Ltd | Welling | 2025 |
| Hyperstep Academy Ltd | Norwich | 2025 |
| Hyphae Learning Ltd | Guildford | 2023 |
| Hyphae Primary Learning Ltd | Guildford | 2024 |
| Hyphen Education Ltd | London | 2025 |
| Hypnobirth Ltd | Hertford | 2023 |
| Hypnobirthing Your Way Ltd | Middlesbrough | 2024 |
| Hypnodriving UK Ltd | Bradford | 2022 |
| Hypnotherapy and Coaching Solutions Ltd | Fareham | 2026 |
| Hypnotic Solutions Training Limited | London | 2006 |
| Hysynch Ltd | London | 2025 |
| Hyypa Ltd | Portsmouth | 2022 |
| HZ Soccer Solutions Limited | Tadworth | 2016 |
| Hzeegrow Limited | Cardiff | 2025 |
| HZH Crafts Ltd | Southall | 2021 |
| HZL Specialist Solutions Limited | Nottingham | 2007 |
| Hzma Training Ltd | Manchester | 2025 |
| I & S Childcare Ltd | London | 2017 |
| I Accelerator CIC | London | 2019 |
| I AM a Melaninaire Ltd | Bristol | 2025 |
| I AM a Songwriter Ltd | Waterlooville | 2025 |
| I AM a Woman Campaign Ltd | London | 2023 |
| I AM About YOU Limited | Liverpool | 2014 |
| I AM Academy Ltd | London | 2020 |
| I AM Affirmed CIC | Birmingham | 2025 |
| I AM Art CIC | London | 2025 |
| I AM B.I.R.C.H. Ltd | Oldham | 2024 |
| I AM Beyoutiful Ltd | Ramsgate | 2021 |
| I AM Darren Cooper Limited | London | 2026 |
| I AM Growth Ltd | Bermondsey | 2017 |
| I AM Helen CIC | Thatcham | 2025 |
| I AM History Limited | London | 2020 |
| I AM Ichronic CIC | Rugby | 2025 |
| I AM ME Collective CIC | Wirral | 2025 |
| I AM ME Global Community Interest Company | Cheltenham | 2019 |
| I AM ME Support CIC | Stanmore | 2025 |
| I AM More Academy Limited | Torquay | 2022 |
| I AM Music Community Group | Ipswich | 2013 |
| I AM Nino 420 Ltd | Manchester | 2026 |
| I AM Nurture CIC | Newtownabbey | 2025 |
| I AM Possible Education Ltd | Bradford | 2023 |
| I AM Training Ltd | London | 2021 |
| I AM Well Ltd | London | 2024 |
| I B4E CIC | East Boldon | 2023 |
| I C M Foundation CIC | London | 2010 |
| I CAN and I AM Limited | Frome | 2015 |