| Hucks Autos Limited | Wholesale & retail | 2014 |
| Hudson AV Ltd | Information & communication | 2024 |
| Hughes & Co Design Limited | Information & communication | 2002 |
| Hughes Firman Ovel Asset Management Limited | Financial services | 2007 |
| Hughes Investment Holdings Ltd | Financial services | 2026 |
| Hughes Plant Limited | Administrative & support | 1998 |
| Hughstock Ltd | Wholesale & retail | 2022 |
| Huginn & Muninn AI Ltd | Information & communication | 2026 |
| Hull Fencing Limited | Administrative & support | 2013 |
| Hull House Mews RTM Company Limited | Households | 2020 |
| Hull Property Portfolio Ltd | Real estate | 2025 |
| Hull's Enterprises Limited | Real estate | 1987 |
| Humbae Limited | Real estate | 2022 |
| Hume Commercial & Planning Solutions Ltd | Professional & scientific | 2011 |
| Humes of Halstead Limited | Wholesale & retail | 2006 |
| Humphrey and Homes Limited | Real estate | 2026 |
| Humphrey Building Solutions Ltd | Construction | 2021 |
| Humpty Dumpty Pre-School (Colchester) | Education | 2010 |
| Huner Kebab & Pizza Limited | Hospitality | 2020 |
| Hungarian Omega London (HOL) Community C.I.C. | Other services | 2024 |
| Hunger Express Foods Ltd | Hospitality | 2020 |
| Hunger Hub PVT Ltd | Hospitality | 2025 |
| Hungry Beards Ltd | Manufacturing | 2025 |
| Huntcliff Yorkshire Property Ltd | Real estate | 2022 |
| Hunter Brothers Ltd | Hospitality | 2023 |
| Hunter Mae-Grant Limited | Information & communication | 2016 |
| Hunterexpress Ltd | Transport & logistics | 2018 |
| Hunters Chase Vineyard Ltd | Agriculture & fishing | 2020 |
| Hunters Corner Management Company Limited | Households | 1982 |
| Hunterskill Associates Ltd | Other services | 2016 |
| Hunter’S Chase (Elmstead Market) Management Company Limited | Real estate | 2021 |
| Hunts Hill Chartered Physiotherapist Ltd | Health & social care | 2013 |
| Hunwicke Kebab Limited | Hospitality | 2025 |
| Hunwicke Spice Limited | Hospitality | 2019 |
| HUR (UK) Limited | Wholesale & retail | 2002 |
| Hurd Fencing Ltd | Construction | 2012 |
| Hurford Limited | Information & communication | 2009 |
| Hurt Creative Ltd | Information & communication | 2022 |
| Hurth-Mckoen Ltd | Information & communication | 2019 |
| Hurzum Trans Ltd | Transport & logistics | 2025 |
| HUS EN Ltd | Hospitality | 2022 |
| Huske&Malone Ltd | Wholesale & retail | 2022 |
| Hussain & Co Investment Ltd | Financial services | 2025 |
| Hussar Lightning Protection Ltd | Construction | 2020 |
| Hutton Birch Limited | Real estate | 2012 |
| Hutton Builders Limited | Extraterritorial | 1999 |
| Hutton Construction Limited | Construction | 1986 |
| Hutton East Limited | Construction | 2015 |
| Hutton Group Limited | Construction | 2002 |
| Hutton Holdings Limited | Extraterritorial | 1998 |
| Hutton Management Services Limited | Extraterritorial | 1991 |
| Hutton South East Limited | Construction | 2018 |
| HV Commissioning Solutions Limited | Professional & scientific | 2019 |
| HW Colchester Holdings Limited | Financial services | 2024 |
| HW Concept Ltd | Other services | 2024 |
| HW Partners Ltd | Professional & scientific | 2018 |
| HW Prop Serv Limited | Professional & scientific | 2023 |
| Hwco SUB Limited | Extraterritorial | 2024 |
| HY & CMR Management Limited | Administrative & support | 1999 |
| Hyamm's Boutique Hair & Beauty Ltd | Other services | 2019 |
| Hybrid Athlete Club Ltd | Other services | 2023 |
| Hybrid Consultancy Ltd | Health & social care | 2026 |
| Hyde Landscapes Ltd | Administrative & support | 2018 |
| Hydra Professional Services LLP | | 2012 |
| Hydration London Limited | Wholesale & retail | 2019 |
| Hydro Refresh Limited | Administrative & support | 2026 |
| Hydro Ventures Ltd. | Energy | 2024 |
| Hydro-Therm Heating Ltd | Construction | 2016 |
| Hydrocut Limited | Agriculture & fishing | 1959 |
| Hygge Housing Ltd | Real estate | 2018 |
| Hygiene Clean Ltd | Administrative & support | 2018 |
| HYPE107SOUNDS Promotions UK Ltd | Wholesale & retail | 2022 |
| Hyperdrive Solutions Limited | Information & communication | 1999 |
| Hyperfocal Ltd | Professional & scientific | 2011 |
| Hythe Convenience Store Ltd | Wholesale & retail | 2023 |
| Hythe Hill (Colchester) Management Limited | Real estate | 1988 |
| Hythe Prescriptions Limited | Wholesale & retail | 2012 |
| I & G Harvey Family | Financial services | 2025 |
| I C W Futures Limited | Financial services | 1988 |
| I CUT 2 Ltd | Other services | 2020 |
| I Fade Barber Ltd | Other services | 2025 |
| I Fade Barbers Colchester Ltd | Other services | 2026 |
| I Fleet Systems Limited | Information & communication | 2010 |
| I Glow Studio Ltd | Other services | 2025 |
| I Light Limited | Health & social care | 2023 |
| I S Chimney Sweep Limited | Administrative & support | 2024 |
| I'M OUT Limited | Administrative & support | 2018 |
| I-Care Legal Limited | Professional & scientific | 2006 |
| I-Fly Limited | Administrative & support | 2012 |
| I-Threes Services Ltd | Health & social care | 2022 |
| I.M.E. Holdings Limited | Financial services | 2016 |
| I.Manister Holdings Ltd | Real estate | 2019 |
| I.Q Aesthetics Essex Limited | Other services | 2022 |
| I.T.I. (U.K.) Limited | Wholesale & retail | 1984 |
| Iach Limited | Professional & scientific | 2019 |
| Iain Wright Associates Limited | Professional & scientific | 2011 |
| IAM Engineering Limited | Professional & scientific | 2013 |
| IAMEARTH3333 Ltd | Administrative & support | 2014 |
| Iamlynette Limited | Other services | 2014 |
| IAN Allston Tree Surgery Limited | Agriculture & fishing | 2010 |