| DGN Ltd | Transport & logistics | 2019 |
| Divine Health Hospitality & Hotels Limited | Hospitality | 2012 |
| Divine Health Locums Limited | Health & social care | 2014 |
| Djmg Limited | Professional & scientific | 2016 |
| Donald Harrison Homes Limited | Professional & scientific | 2004 |
| Dovedale Realty Limited | Real estate | 2022 |
| Dovedale Stores Limited | Wholesale & retail | 2022 |
| Drain-It Ltd | Water & waste | 2019 |
| Dream Real Estate Limited | Real estate | 2021 |
| Dronbrix Limited | Professional & scientific | 2022 |
| DTB Associates Limited | Administrative & support | 2021 |
| Dvayu Global Limited | Professional & scientific | 2024 |
| DW Catering Ltd | Hospitality | 2021 |
| Dynasty Takeaway (Hillington) Limited | Hospitality | 2019 |
| Easyway Convenience Stores Limited | Wholesale & retail | 2006 |
| Ebenezer E and J London Ltd | Transport & logistics | 2025 |
| Eco Engineers LLP | | 2011 |
| EJ Capital Limited | Real estate | 2020 |
| EK Affinity Ltd | Wholesale & retail | 2020 |
| Essex Wines Ltd | Wholesale & retail | 2016 |
| Euro Electrical Supplies Ltd | Wholesale & retail | 2014 |
| Eversfield Gardens Limited | Real estate | 2008 |
| Falooda &Co Ltd | Hospitality | 2024 |
| Falooda Village Ltd | Hospitality | 2026 |
| Fast Flamez Limited | Wholesale & retail | 2013 |
| First Stop Claygate Limited | Wholesale & retail | 2023 |
| First Stop Surbiton Homeware Limited | Wholesale & retail | 2020 |
| First Stop Surbiton Ltd | Wholesale & retail | 2018 |
| Food Vape & Wine Limited | Wholesale & retail | 2024 |
| Fredrick's Hotel & Spa (Maidenhead) Ltd | Hospitality | 2023 |
| G R Hargun Properties Ltd | Real estate | 2019 |
| G Tyres North Ltd | Wholesale & retail | 2024 |
| GB Infotech Retail Ventures Limited | Administrative & support | 2016 |
| General Store (Berkshire) Ltd | Wholesale & retail | 2014 |
| Geraldine Mattis Limited | Manufacturing | 2008 |
| Ghai & Co. Limited | Construction | 2002 |
| Ghai Properties Limited | Real estate | 2019 |
| Ghirgroup Ltd | Real estate | 2011 |
| Gillallan Limited | Real estate | 1985 |
| Gilmoreland Limited | Real estate | 2018 |
| Gina B Beauty Ltd | Arts & recreation | 2012 |
| Glam & Glow Aesthetics Limited | Other services | 2023 |
| Global Data Services (UK) Limited | Information & communication | 2011 |
| Global Drycleaners Ltd | Other services | 2018 |
| Global Fintech Technology Limited | Administrative & support | 2022 |
| Global Link Transfers Ltd | Transport & logistics | 2025 |
| Global Merchants Tech Limited | Administrative & support | 2022 |
| Global Property Limited | Real estate | 2009 |
| Global Retail Tech Marketing Limited | Administrative & support | 2017 |
| GLS Lofts Limited | Construction | 2006 |
| GNG Brickwork Ltd | Construction | 2026 |
| Good Cleaners Limited | Other services | 2010 |
| Grandit Limited | Extraterritorial | 2011 |
| Grasiana Healthcare Ltd | Health & social care | 2014 |
| Greyson Law Chambers Limited | Professional & scientific | 2024 |
| GS Lamba Food & Wine Limited | Wholesale & retail | 2020 |
| Gsbn Limited | Other services | 2014 |
| GSC Traders Limited | Wholesale & retail | 2013 |
| Gurukripa Properties Ltd | Real estate | 2018 |
| H&M Buildco Ltd | Construction | 2025 |
| H&Sm Accountants Ltd | Professional & scientific | 2025 |
| H&T Property Limited | Real estate | 2022 |
| Hamilton Wines Ltd | Wholesale & retail | 2021 |
| Hampstead International (UK) Limited | Real estate | 2015 |
| Handyman's Hardware Ltd | Wholesale & retail | 2020 |
| Harven Form (Foundry) Limited | Manufacturing | 1966 |
| Harvest Hill (Management) Company Limited | Construction | 2003 |
| Harvey Road (Rickmansworth) Limited | Construction | 2009 |
| Hayes Kebab & Burger Ltd | Hospitality | 2022 |
| Heathrow Property Management Ltd | Real estate | 2022 |
| Heavenlyinnovation Ltd | Construction | 2023 |
| Henley Design & Build Ltd | Administrative & support | 2016 |
| Hexatech Computers Limited | Information & communication | 2010 |
| Hexatech Services Ltd | Information & communication | 2009 |
| Hillingdon Crispy Pizza Ltd | Hospitality | 2023 |
| Hillingdon Paint & Design Limited | Other services | 2014 |
| Hinchley Orthodontics Ltd | Health & social care | 2025 |
| Home & Style Ltd | Wholesale & retail | 2023 |
| Horloge Ltd | Wholesale & retail | 2022 |
| Hoss Investments Limited | Real estate | 2022 |
| Hot Express Pizza (Hillingdon) Ltd | Hospitality | 2024 |
| Hot Express Pizza Uxbridge Limited | Hospitality | 2025 |
| House of M&H Limited | Wholesale & retail | 2025 |
| Howarth Contractors Limited | Construction | 1995 |
| Howarth Homes (Cressex Road) Limited | Construction | 2010 |
| Howarth Homes (Farnham Close) Limited | Construction | 2013 |
| Howarth Homes (Scots Hill) Limited | Construction | 2009 |
| Howarth Homes (STB) Limited | Construction | 2013 |
| Howarth Homes (West London) Limited | Construction | 2016 |
| Howarth Homes Holdings Limited | Construction | 2025 |
| Howarth Homes Limited | Construction | 1988 |
| Howarth Investments Limited | Construction | 1964 |
| Hussain Developments Ltd | Construction | 2012 |
| Hyproc Properties LLP | | 2024 |
| I & I Business Limited | Wholesale & retail | 2019 |
| IAC Car Hire Ltd | Administrative & support | 2025 |
| Ickenham Service Management RTM Company Limited | Households | 2018 |
| Ideanomic Limited | Information & communication | 2013 |
| Iexport Limited | Wholesale & retail | 2012 |
| Inside OUT Building Services Limited | Mining & quarrying | 2017 |