| Hollywood Bowl Group PLC | Arts & recreation | 2016 |
| Hollywood Nails & Spa SC Ltd | Other services | 2026 |
| Holmes Meadow Management Limited | Households | 2011 |
| Holmwood Residents Limited | Households | 2016 |
| Holscher and Olivier Properties Limited | Real estate | 2019 |
| Holywell Heights Management Limited | Households | 2004 |
| Home 12 Ltd | Financial services | 2025 |
| Home Brickwork Ltd | Construction | 2023 |
| Home Care Property Solutions Ltd | Construction | 2024 |
| Home Counties Accommodation Limited | Real estate | 2012 |
| Home Counties Heating and Bathrooms Ltd | Construction | 2022 |
| Home Counties Heating Ltd | Wholesale & retail | 2008 |
| Home Counties Loft Ladders Ltd | Construction | 2021 |
| Home of Beauty Ltd | Other services | 2025 |
| Home-Start Hertfordshire | Health & social care | 2012 |
| Homecircle Ltd | Real estate | 2020 |
| Homelea Services Limited | Transport & logistics | 2020 |
| Homes WE Trust Ltd | Real estate | 2017 |
| Homes@Shire Ltd | Real estate | 2018 |
| Homeworx a V Limited | Wholesale & retail | 2022 |
| Honed Partners Limited | Administrative & support | 2025 |
| Honest Traders Limited | Real estate | 2013 |
| Hoopers Yard Management Company Limited | Administrative & support | 2007 |
| Hop'In MAD Ltd | Wholesale & retail | 2019 |
| Hopespare Limited | Manufacturing | 1986 |
| Hops HQ Limited | Information & communication | 2020 |
| Hormonious Management Limited | Professional & scientific | 2022 |
| Horseshoe Associates Limited | Professional & scientific | 2022 |
| Hot and Cold Solutions Limited | Construction | 2006 |
| Hot Chilli Solutions Ltd | Information & communication | 2013 |
| Hot Key Property Development Ltd | Real estate | 2023 |
| Hot Key Property Ltd | Financial services | 2019 |
| Hot Ventures Limited | Wholesale & retail | 2013 |
| Hounte Limited | Other services | 2017 |
| House of Theodora Limited | Information & communication | 2016 |
| Housemate Services Limited | Manufacturing | 2025 |
| Houseofelle Limited | Other services | 2025 |
| Housing and Benefits Help Ltd | Real estate | 2023 |
| Hovercross Limited | Financial services | 2021 |
| Howard Homes (HH) Ltd | Real estate | 2025 |
| Howard Pease Architects Limited | Professional & scientific | 2012 |
| Howarth Plastering Ltd | Construction | 2026 |
| Howland Properties Ltd | Real estate | 2015 |
| HP Grill Ltd | Hospitality | 2019 |
| HP Spice Ltd | Hospitality | 2019 |
| HP2 Services Ltd | Professional & scientific | 2016 |
| HPT Gardening Ltd | Administrative & support | 2024 |
| HR IQ Solutions Limited | Administrative & support | 2017 |
| HR Oriented Ltd | Professional & scientific | 2025 |
| HRG Global Ltd | Professional & scientific | 2026 |
| HRP Professional Services Ltd | Professional & scientific | 2013 |
| HSD Instrumentation Ltd | Manufacturing | 2023 |
| HSG2 Ltd | Real estate | 2025 |
| Hshc Limited | Real estate | 1998 |
| HSL Management Group Ltd | Real estate | 2020 |
| HT Maysun Ltd | Wholesale & retail | 2022 |
| HT Plant Hire Ltd | Construction | 2016 |
| Htft Trading Ltd | Wholesale & retail | 2023 |
| HTH Building Ltd | Construction | 2018 |
| Hucknall Homes Ltd | Real estate | 2024 |
| Hudson Group Security Limited | Administrative & support | 2017 |
| Hudu & Nesty Ltd | Construction | 2017 |
| Hughes Design & Build Limited | Real estate | 2012 |
| Huldra Recruitment Ltd | Professional & scientific | 2015 |
| Hulse & SON Property Management Ltd | Construction | 2026 |
| Hulse Limited | Construction | 2006 |
| Humac IT Ltd | Information & communication | 2023 |
| Humac Rentals Ltd | Real estate | 2021 |
| Human Becomings Ltd | Professional & scientific | 2024 |
| Human Choice Consulting Ltd | Administrative & support | 2021 |
| Human Choice Healthcare Ltd | Public administration | 2024 |
| Humanx Group Limited | Information & communication | 2022 |
| Humble Flame Candle Co. Limited | Manufacturing | 2021 |
| Hungarian Folk Dance London Community Interest Company | Arts & recreation | 2025 |
| Hunt Contracting Services Ltd | Information & communication | 2018 |
| Hunters Group Holdings Ltd | Administrative & support | 2021 |
| Hunters Guarding Ltd | Administrative & support | 2024 |
| Hunting Gate Mews Management Company Limited | Households | 1987 |
| Huntly Holdings Ltd | Financial services | 2020 |
| Hurban Interiors Ltd | Manufacturing | 2019 |
| Hurricane Modular Commerce Limited | Information & communication | 2016 |
| Hurryagent Limited | Construction | 1991 |
| Hush Finance Ltd | Professional & scientific | 2025 |
| Huxons Recruitment Ltd | Administrative & support | 2023 |
| HV LV Consultancy Services Limited | Professional & scientific | 2023 |
| HW IT Services Ltd | Information & communication | 2025 |
| Hydraulicsworld Ltd | Manufacturing | 2022 |
| Hyland Technical Services Limited | Construction | 2024 |
| Hyrock Limited | Real estate | 2026 |
| I & S Georgievi Construction Ltd | Construction | 2015 |
| I Clean London Limited | Administrative & support | 2019 |
| I G H GAS & Heating Specialist Ltd | Energy | 2018 |
| I J N Plumbing & Heating Services Ltd | Construction | 2013 |
| I-Brate Beauty Limited | Other services | 2023 |
| I-Dilemma Limited | Information & communication | 2014 |
| I.J.K. Timber Group Limited | Wholesale & retail | 1918 |
| I2 Fast Limited | Professional & scientific | 2017 |
| I2N Ltd | Information & communication | 1999 |
| IAN Alexander Property Limited | Real estate | 2015 |
| Ibex Foods Limited | Wholesale & retail | 1984 |