| Gym Repair Services Limited | Manufacturing | 2021 |
| G’S Group Holdings (2021) Limited | Financial services | 2021 |
| H & B J Management Limited | Real estate | 2017 |
| H & D Williams Aerospace Services Limited | Administrative & support | 2007 |
| H & P Aerials Limited | Construction | 2006 |
| H V Trading Limited | Wholesale & retail | 2016 |
| H2 Management Housing Ltd | Real estate | 2021 |
| H2H Business Finance Limited | Financial services | 2021 |
| Haac Limited | Other services | 2003 |
| Habis Ltd | Hospitality | 2015 |
| Haddenham Arts Centre C.I.C. | Hospitality | 2018 |
| Haddenham Investments Limited | Real estate | 2013 |
| Haddenham Tutors Ltd | Education | 2026 |
| Hadleigh Court (Flat Management) Limited | Households | 1984 |
| Hadleigh Interiors Limited | Administrative & support | 2006 |
| Hadleigh Stars Gymnastics C.I.C. | Arts & recreation | 2016 |
| Hadley Industrial Holdings Limited | Financial services | 1989 |
| Hadley International Limited | Professional & scientific | 1988 |
| Hadley Property Investment & Development Limited | Real estate | 1988 |
| Hadley Wood PRE School and Playgroup Limited | Construction | 1986 |
| Hair @ NO.7 Ltd | Other services | 2011 |
| Hair by Kateen Ltd | Other services | 2025 |
| Hair ELY Limited | Real estate | 2024 |
| Halal Travel Network Ltd | Professional & scientific | 2023 |
| Halcon Group Limited | Financial services | 2025 |
| Halcyon 10 Group Ltd | Financial services | 2024 |
| Halcyon 10 IP Holdings Ltd | Administrative & support | 2024 |
| Halcyon 10 Properties Ltd | Households | 2025 |
| Halcyon KCW SPV 1 Ltd | Financial services | 2024 |
| HALCYON10 Ltd | Manufacturing | 2023 |
| Hall Barn Road Management Company Limited | Households | 2001 |
| Hallie Parker Limited | Professional & scientific | 2024 |
| Halligarth Bioadvisors Ltd | Manufacturing | 2018 |
| Halls Transport Limited | Transport & logistics | 1999 |
| Halls Vehicle Services Limited | Wholesale & retail | 2016 |
| Hallsville Foundation | Health & social care | 2021 |
| Halsey Capital Partners Limited | Financial services | 2004 |
| Hamm Properties Limited | Real estate | 2019 |
| Hammill Associates Limited | Professional & scientific | 1999 |
| Hammond Heritage Antiques Ltd | Wholesale & retail | 2025 |
| Hammond Wellness & Aesthetics Ltd | Other services | 2025 |
| Hanchett END (Phase 1) Residents Management Company (NO. 1) Limited | Households | 2008 |
| Hancoe Commercial Cleaning Ltd | Administrative & support | 2021 |
| Handy Plaice 369 Limited | Hospitality | 2024 |
| Handy Plaice Mobile Catering Limited | Hospitality | 2019 |
| Hannam Leisure Limited | Arts & recreation | 2011 |
| Haren Holdings Limited | Financial services | 2026 |
| Harnwell & SON Limited | Wholesale & retail | 2011 |
| Harradine Plumbing & Heating Limited | Construction | 2023 |
| Harrimere Oaks Ltd | Agriculture & fishing | 2016 |
| Harrison Agricultural Contracting Limited | Agriculture & fishing | 2010 |
| Harry Specters (Online) Limited | Wholesale & retail | 2019 |
| Harry Specters Limited | Manufacturing | 2012 |
| Harvey Family Investment Company Limited | Real estate | 2025 |
| Harvey Recruitment Solutions Ltd | Administrative & support | 2025 |
| Hasler Pest Control Ltd | Administrative & support | 2021 |
| Hasse Property Ltd | Financial services | 2022 |
| Hatoum Limited | Real estate | 2022 |
| Havacre Bloodstock Limited | Agriculture & fishing | 2025 |
| Hawea Properties Limited | Real estate | 2023 |
| Hawkins Mutes Limited | Manufacturing | 2022 |
| HBS Inspire ME Ltd | Education | 2021 |
| HDF Pyknometers Limited | Professional & scientific | 2017 |
| Head FEN Country Retreat Limited | Real estate | 2018 |
| Head FEN Lakes Fisheries Limited | Arts & recreation | 2008 |
| Headphone Centre Limited | Wholesale & retail | 2012 |
| Health Local Limited | Health & social care | 2023 |
| Heap & Co Limited | Administrative & support | 2026 |
| Heart Brides Limited | Wholesale & retail | 2002 |
| Heartrx Integrative Hypnosis & Regression Therapy Ltd | Health & social care | 2026 |
| Heatflo (U.K.) Limited | Construction | 2003 |
| Helen Bartlett Limited | Professional & scientific | 2004 |
| Henley Stoves & Fireplaces Limited | Wholesale & retail | 2015 |
| Henry Crabb Estate Road Ltd | Transport & logistics | 2025 |
| Heppner Transport Ltd | Transport & logistics | 2014 |
| Hereward Partners Ltd | Administrative & support | 2024 |
| Heritage Horsepower Limited | Wholesale & retail | 2023 |
| Heritage Leadwork Limited | Construction | 2023 |
| Hermitage Marine (Property) Limited | Real estate | 2010 |
| Hermitage Marine Limited | Arts & recreation | 2010 |
| Herocreep Ltd | Information & communication | 2025 |
| HEY Bendalls Limited | Professional & scientific | 2011 |
| HEY Solicitors Ltd | Professional & scientific | 2014 |
| Heybr Properties Limited | Financial services | 2017 |
| Heybrook Hifi Ltd | Manufacturing | 2022 |
| Heyland Apartments RTM Company Limited | Households | 2021 |
| HGV Alliance UK Ltd | Transport & logistics | 2018 |
| HHF Estates Limited | Real estate | 2024 |
| Highcraft Cambridge Limited | Construction | 1997 |
| Highfield Barn Limited | Real estate | 2011 |
| Highfield Gate Haddenham Residents (Management Company) Limited | Households | 2008 |
| Highflyer Haulage Ltd | Transport & logistics | 2017 |
| Highflyer Trading Company Limited | Extraterritorial | 2012 |
| Hilgay Rose and Crown Limited | Hospitality | 2015 |
| Hillfort Trading Ltd | Administrative & support | 2017 |
| Hillgreen Interiors Ltd | Construction | 2025 |
| Hillrow Ltd | Real estate | 2024 |
| Hills & Valleys Limited | Wholesale & retail | 2018 |
| Hindson Ltd | Real estate | 2022 |
| Hint Ltd | Health & social care | 2020 |