| Hoam Properties Ltd | Real estate | 2024 |
| Hobbs and Dolby Limited | Administrative & support | 2020 |
| HOE Properties Limited | Real estate | 2024 |
| Holayis Limited | Administrative & support | 2012 |
| Holder Allen Property Ltd | Real estate | 2019 |
| Holgate Securities Limited | Real estate | 1956 |
| Holistic OT Practice Limited | Health & social care | 2023 |
| Holland Park Films Limited | Information & communication | 2015 |
| Hollie Joyce Design Ltd | Professional & scientific | 2023 |
| Holm Glen Investments Limited | Professional & scientific | 1957 |
| Holmesdale Residential Investments Ltd | Construction | 2023 |
| Holmleigh House Limited | Households | 2022 |
| Holson Maintenance Services Limited | Construction | 2018 |
| Holwood Park Avenue Residents Association Limited | Households | 1976 |
| Home Essentials Blackfen Ltd | Wholesale & retail | 2024 |
| Home Hair Retreat Limited | Other services | 2025 |
| Home Response Limited | Administrative & support | 2011 |
| Home Stories Ltd | Professional & scientific | 2023 |
| Homewood Construction (Longfield) Ltd | Construction | 2005 |
| Honan Contracts Ltd | Construction | 2018 |
| Honour &Glory Healthy Mind Ltd | Other services | 2020 |
| Hook Lane Limited | Real estate | 2024 |
| Horizons Project Management Ltd. | Professional & scientific | 2017 |
| Horse 4 Thought Ltd | Agriculture & fishing | 2020 |
| Horse Box Hospitality Limited | Hospitality | 2021 |
| Horsleydown LLP | | 2002 |
| Hospitality Recruitment Heads Ltd | Administrative & support | 2022 |
| Host-Uk Internet Ltd. | Information & communication | 2007 |
| Hot Quality Limited | Information & communication | 2015 |
| Hoteladvice Limited | Administrative & support | 1998 |
| House Cycle Ltd | Water & waste | 2020 |
| House Figueira Ltd | Wholesale & retail | 2025 |
| House of Craig Ltd | Real estate | 2025 |
| House of the Needle Ltd | Administrative & support | 2019 |
| House of Willow Alexander Ltd | Other services | 2023 |
| Housego Solutions Limited | Administrative & support | 2014 |
| Housepairs Limited | Real estate | 2025 |
| Hove Highway Solutions Limited | Construction | 2019 |
| HOW SHE Wore IT. Limited | Wholesale & retail | 2025 |
| Howa Group Ltd | Administrative & support | 2021 |
| Howa Living Ltd | Wholesale & retail | 2024 |
| Howard Porter Limited | Professional & scientific | 2014 |
| HRA Management Company (Kent) Limited | Administrative & support | 2011 |
| HRH Electrical Contractors Limited | Construction | 2024 |
| Hrism V Limited | Construction | 2015 |
| HSL Group Limited | Administrative & support | 1987 |
| Hths Properties Limited | Real estate | 2018 |
| HTR Building Services Limited | Construction | 2013 |
| Huaxin International Travel Ltd | Administrative & support | 2022 |
| Hub 107 Limited | Construction | 2019 |
| Huber & Sons Ltd | Professional & scientific | 2026 |
| Hudsons Roofing and Building Ltd | Construction | 2021 |
| Hulfurb Limited | Construction | 2024 |
| Hulhomes Ltd | Professional & scientific | 2017 |
| Hulhomes Property Investments Ltd | Real estate | 2014 |
| Hummel-Btlp Ltd | Real estate | 2025 |
| Hunter Contracts Limited | Real estate | 1999 |
| Hunter Flooring Limited | Construction | 2008 |
| Husam Star Limited | Real estate | 2022 |
| Hvac Testing and Balancing Limited | Construction | 2023 |
| HW School Skills 2018 Ltd | Arts & recreation | 2018 |
| Hyde Building Limited | Construction | 2013 |
| Hydra RKM Limited | Information & communication | 2010 |
| Hydrangea Properties Ltd | Real estate | 2026 |
| Hypnosis Solutions Limited | Other services | 2021 |
| Hythe ST Limited | Construction | 2021 |
| I AM SO Creative Limited | Professional & scientific | 2017 |
| I D W E Ltd | Construction | 1995 |
| I Love Ironing Ltd | Administrative & support | 2025 |
| I N a C O R W a Y Limited | Other services | 2014 |
| I T M M Ltd | Information & communication | 2012 |
| I-Buyz Ltd | Wholesale & retail | 2020 |
| I. P. Fire Engineering Limited | Construction | 2017 |
| I.D. Rail Limited | Construction | 2009 |
| I4 Security Ltd | Administrative & support | 2025 |
| IAN Osborne Limited | Public administration | 2014 |
| IAN Steven Hair Limited | Other services | 2011 |
| Ibericos ETC. (Bluewater) Limited | Hospitality | 2019 |
| Ibericos ETC. (Westfield London) Limited | Hospitality | 2020 |
| Icarus Management Limited | Construction | 2021 |
| ICF Mortgages Limited | Financial services | 2021 |
| ICF Plumbing and Heating Limited | Construction | 2012 |
| Icicle Boutique Limited | Wholesale & retail | 2014 |
| Icicle Boutique Online Limited | Wholesale & retail | 2021 |
| Icomsen Ltd | Real estate | 2026 |
| Icon Travel Group Ltd | Administrative & support | 2019 |
| ID Development Training (UK) Ltd | Health & social care | 2009 |
| Idave Solutions Limited | Other services | 2026 |
| Idcap LLP | | 2024 |
| Ideal Interiors (London) Limited | Construction | 2016 |
| Ideal Interiors Holdings Limited | Financial services | 2019 |
| Ideal Interiors South East Limited | Construction | 2025 |
| Ideal Lights FM Limited | Construction | 2013 |
| Identical Security Limited | Administrative & support | 2023 |
| IDM Capital Limited | Information & communication | 2022 |
| Idmiston Consultancy Limited | Administrative & support | 2016 |
| Idsh Europe Limited | Financial services | 2020 |
| Idsh Limited | Construction | 2017 |
| IDWAYS2BEAUTI Limited | Wholesale & retail | 2025 |
| Ihlara Valley 68 Ltd | Hospitality | 2022 |