| Green Swan Financial Ltd | Financial services | 2023 |
| Greenacre Elec Limited | Construction | 2026 |
| Greenacre Executive Ltd | Administrative & support | 2020 |
| Greenacre Recruitment Ltd | Administrative & support | 2011 |
| Greenacre Transfers Ltd | Transport & logistics | 2023 |
| Greenacres Building Services Limited | Construction | 2024 |
| Greenbank Skinner Ltd | Professional & scientific | 2024 |
| Greenford Crescent Management Company Limited | Households | 2019 |
| Greengrass Property Group Ltd | Real estate | 2022 |
| Greenleas Developments Ltd | Construction | 2024 |
| Greenscape Garden Maintenance Ltd | Agriculture & fishing | 2013 |
| Greentreeco Ltd | Administrative & support | 2017 |
| Greenwich Freeholds Limited | Households | 2013 |
| Gregorys Staff Agency Limited | Administrative & support | 1985 |
| Grey Associates Limited | Professional & scientific | 2005 |
| Grey Matters - Mortgage Studio Limited | Financial services | 2016 |
| Grimstone North Ltd | Public administration | 2019 |
| Grocery 4 ALL Limited | Wholesale & retail | 2025 |
| Groom Place Management Company Limited | Households | 2016 |
| Groomarts LLP | | 2024 |
| Groovy Beats Entertainment Ltd | Information & communication | 2024 |
| Grosvenor Davis Limited | Administrative & support | 2016 |
| Grounded AI Limited | Other services | 2022 |
| Groundschool CIC | Education | 2025 |
| Groundswell Agriculture Ltd | Education | 2016 |
| Groundworks Coffee Limited | Administrative & support | 2013 |
| Groundworks UK Ltd Limited | Construction | 2013 |
| Groveway Limited | Agriculture & fishing | 1996 |
| Growraw Ltd. | Wholesale & retail | 2017 |
| Grupo Banamiel UK Limited | Wholesale & retail | 2021 |
| Gryphon Hockey Limited | Wholesale & retail | 1997 |
| GSE Smart Repair Ltd | Wholesale & retail | 2015 |
| GSK Transport Group Ltd | Transport & logistics | 2026 |
| Gsps Rooted Ltd | Wholesale & retail | 2026 |
| Gthi Solutions Ltd | Professional & scientific | 2024 |
| Guardian Metal Roofing Ltd | Construction | 2024 |
| Guest Holding Group Ltd | Financial services | 2025 |
| Guest Lettings Ltd | Real estate | 2025 |
| Guest'Sproperty Ltd | Real estate | 2021 |
| Guiding Edge Group Limited | Professional & scientific | 2023 |
| Gunn TI Limited | Administrative & support | 2015 |
| Gurson Properties Limited | Real estate | 2018 |
| Guruji Groceries Ltd | Wholesale & retail | 2024 |
| Gwenarth Holdings Limited | Financial services | 2021 |
| Gwgn Ltd | Wholesale & retail | 2025 |
| Gymdawgs Ltd | Wholesale & retail | 2025 |
| Gynaeconnect Limited | Health & social care | 2021 |
| H & D Brothers Ltd | Wholesale & retail | 2016 |
| H & G Resources Limited | Administrative & support | 2009 |
| H & J Estates Ltd | Real estate | 2015 |
| H & M Estate Management Limited | Real estate | 2017 |
| H & R Properties Limited | Real estate | 2023 |
| H T T (UK) Limited | Wholesale & retail | 1995 |
| H W Invest Limited | Extraterritorial | 2016 |
| H&B Sales Limited | Wholesale & retail | 2018 |
| H&Bb Ltd | Other services | 2024 |
| H&E Homes Ltd | Construction | 2019 |
| H&M Group Services Ltd | Information & communication | 2026 |
| H&Q Consultants Ltd | Construction | 2023 |
| H-Town Rags Ltd | Wholesale & retail | 2021 |
| H.G. Leasing Limited | Administrative & support | 2001 |
| H.J. Haywood and SON Limited | Construction | 1974 |
| H3SS Ltd | Wholesale & retail | 2021 |
| HA Reid Real Estate Ltd | Real estate | 2025 |
| HA Transmission Ltd | Wholesale & retail | 2018 |
| HA1 PH Ltd | Hospitality | 2026 |
| Hair by Phillip Limited | Other services | 2007 |
| Hair Studio 160 Limited | Other services | 2025 |
| Halcyon Consulting (UK) Ltd | Professional & scientific | 1994 |
| Halcyon Doctors Limited | Health & social care | 2011 |
| Hale & Ahearne Developments Ltd | Construction | 2023 |
| Hale Group Construction Limited | Construction | 2023 |
| Hale Hawkins and Co Limited | Real estate | 2008 |
| Half Tang Cosmetology Ltd | Wholesale & retail | 2023 |
| Halfpenny Housing Limited | Real estate | 2024 |
| Halfpenny Investments Limited | Administrative & support | 1998 |
| Halite Salts Limited | Wholesale & retail | 2022 |
| Hall Mccartney Limited | Information & communication | 1979 |
| Halls Green Developments Limited | Construction | 2015 |
| Halo Secure Solutions Limited | Administrative & support | 2024 |
| Halsey Drive Limited | Other services | 2000 |
| Hambledon Chapman Associates Limited | Real estate | 2019 |
| Hambleton Associates Limited | Professional & scientific | 2025 |
| Hamilton Estate Agents Ltd | Real estate | 2024 |
| Hamlet Court Road Limited | Real estate | 2020 |
| Hampstead Property Group Limited | Real estate | 2022 |
| Handy Hitchin Ltd | Construction | 2024 |
| Hann Legal Ltd | Professional & scientific | 2024 |
| Hannah Kelly Consulting Ltd | Professional & scientific | 2026 |
| Hanover Homes Limited | Construction | 2018 |
| Happy Days Childrens Charity | Health & social care | 1991 |
| Happy Little Yogi Ltd | Other services | 2019 |
| Happy Motives Ltd | Wholesale & retail | 2018 |
| Happy Starseed Ltd | Other services | 2026 |
| Happykite Ltd | Information & communication | 2015 |
| Happysavers UK Ltd | Wholesale & retail | 2023 |
| Harbury Court Management Limited | Real estate | 2012 |
| Harding Consultancy Limited | Professional & scientific | 1999 |
| Hardy-Tunstall Engineering Ltd | Construction | 2023 |
| Harewood & Corbin Services Limited | Administrative & support | 2025 |