| Hardy's Loving Care Ltd | Health & social care | 2022 |
| Hareem International Ltd | Wholesale & retail | 2025 |
| Harinder Singh Ltd | Wholesale & retail | 2022 |
| Harley Street Prestige Medical Ltd | Health & social care | 2021 |
| Harmanhairstylish Limited | Other services | 2025 |
| Harmondsworth Village Store Ltd | Wholesale & retail | 2012 |
| Harpreet Personal Services Ltd | Construction | 2026 |
| Harrow Community Contracting Limited | Construction | 2025 |
| Hartland Container Storage Ltd | Transport & logistics | 2026 |
| Harzand AI Ltd | Information & communication | 2025 |
| Hasaar Ltd | Wholesale & retail | 2025 |
| Haulora Co Ltd | Transport & logistics | 2025 |
| Haulystic Limited | Administrative & support | 2016 |
| Haus Restaurants Limited | Hospitality | 2021 |
| Hayat-Lifeline Community Ltd | Public administration | 2022 |
| Hayes Readymix Ltd | Construction | 2023 |
| Haylat Management Services Limited | Real estate | 2007 |
| HDI Construction Ltd | Construction | 2023 |
| Health Mystic Limited | Wholesale & retail | 2025 |
| Heathrow 1 Limited | Construction | 2012 |
| Heathrow AA Motors Ltd | Wholesale & retail | 2026 |
| Heathrow AAA Cars Ltd | Wholesale & retail | 2024 |
| Heathrow Babygear Ltd | Wholesale & retail | 2025 |
| Heathrow Carrier Limited | Transport & logistics | 2017 |
| Heathrow Coachworks Limited | Wholesale & retail | 1991 |
| Heathrow Electrics Ltd | Construction | 2021 |
| Heathrow Executive Transfers Limited | Transport & logistics | 2016 |
| Heathrow Freight Services Ltd | Transport & logistics | 2023 |
| Heathrow Highway Food & Wine Ltd | Wholesale & retail | 2022 |
| Heathrow Nexus Chauffeurs Ltd | Transport & logistics | 2023 |
| Heathrow Operating Company Limited | Hospitality | 2016 |
| Heathrow Premium Cars Ltd | Transport & logistics | 2019 |
| Heathrow Vehicle Hire Ltd | Extraterritorial | 1996 |
| Heathrowview Ltd | Hospitality | 2020 |
| Heating Works Limited | Construction | 2018 |
| Heavendesire Ltd | Wholesale & retail | 2025 |
| Help Hands Childcare Ltd | Health & social care | 2021 |
| Henvaro Clothing Ltd | Wholesale & retail | 2026 |
| Hepburn Welding Ltd | Manufacturing | 2022 |
| Herbal Veda Ltd | Wholesale & retail | 2026 |
| Herblu Ltd | Wholesale & retail | 2025 |
| Here There Freight Ltd | Transport & logistics | 2025 |
| Hermes Protection Ltd | Administrative & support | 2025 |
| Hermonie Enterprises Limited | Other services | 2008 |
| Hetman Ltd | Transport & logistics | 2019 |
| Heyfound Ltd | Wholesale & retail | 2025 |
| Hhcl Ltd | Wholesale & retail | 2021 |
| Hibaqh Limited | Health & social care | 2022 |
| Hidab & Co Ltd | Construction | 2022 |
| Highcomm Limited | Construction | 2025 |
| Highway Coaches Limited | Transport & logistics | 2005 |
| Highway Executive Limited | Transport & logistics | 2021 |
| Hiking BOY Ltd | Wholesale & retail | 2022 |
| Hillingdon Refugee Support Organisation | Other services | 2008 |
| Hiltons Interiors Ltd | Professional & scientific | 2014 |
| Hiltons Sales West Drayton Ltd | Real estate | 2021 |
| Hiltons West Drayton Limited | Real estate | 2016 |
| Hinge Consultancy Ltd | Professional & scientific | 2017 |
| Hita SAS Solutions Ltd | Information & communication | 2012 |
| Hive Health Solutions Limited | Administrative & support | 2024 |
| Hiya Tech Ltd | Information & communication | 2015 |
| HIYA2 Limited | Financial services | 2016 |
| HJC Electrical Ltd | Arts & recreation | 2022 |
| HK Dragon Limited | Wholesale & retail | 2025 |
| HK Motorworks Ltd | Wholesale & retail | 2026 |
| Hmdd Limited | Professional & scientific | 2025 |
| HMS Bookkeeping & Payroll Services Ltd | Professional & scientific | 2020 |
| Hockey Stick PVT. Limited | Information & communication | 2020 |
| Hofz Ltd | Hospitality | 2026 |
| Holden Cars Limited | Administrative & support | 2021 |
| Holistic Blitz Retreats Limited | Other services | 2017 |
| Holistic Infotech Limited | Information & communication | 2019 |
| Hollarz Koncepts Limited | Information & communication | 2014 |
| Holy Property & Relocation Services Ltd | Real estate | 2021 |
| Home Praise Construction Limited | Construction | 2025 |
| Home Struct Construction Ltd | Construction | 2018 |
| Homeease Essentials Ltd | Wholesale & retail | 2024 |
| Homevia Ltd | Real estate | 2025 |
| Honey&Greens Ltd | Wholesale & retail | 2022 |
| Hope UK Recruitment Ltd | Administrative & support | 2025 |
| Horizon Chauffeur Services Limited | Transport & logistics | 2025 |
| Horizon-Mena Limited | Extraterritorial | 2013 |
| Hostacks Ltd | Professional & scientific | 2023 |
| Hotel Crew Limited | Water & waste | 2021 |
| Hotelconsult Limited | Hospitality | 2018 |
| Hotna Ltd | Information & communication | 2024 |
| Hotpod Yoga Slough Ltd | Arts & recreation | 2025 |
| House Brickwork Limited | Construction | 2017 |
| House of Boomboom Foundazion Empowering Limited | Public administration | 2026 |
| House of Prayer Ministries | Other services | 2016 |
| Hoynamal Ltd | Wholesale & retail | 2025 |
| HP98 Ltd | Construction | 2025 |
| HPG Construction Limited | Construction | 2019 |
| HPT Autos Limited | Wholesale & retail | 2008 |
| HRK Property Investments Limited | Real estate | 2021 |
| HRV Logistic Ltd | Transport & logistics | 2022 |
| Hsmf Services Limited | Transport & logistics | 2018 |
| HSV Investments Limited | Real estate | 2026 |
| HTS Enterprises London Ltd | Administrative & support | 2025 |
| HU Motors Limited | Wholesale & retail | 2020 |