| Gibbstone Property Ltd | Real estate | 2026 |
| Giving Mortgages Ltd | Financial services | 2022 |
| Global Opportunities in IT Ltd | Professional & scientific | 2013 |
| Global Procurement Services Limited | Professional & scientific | 2015 |
| Global Techk Limited | Construction | 2010 |
| Global Waste 2 Energy Ltd | Water & waste | 2024 |
| Gocodegreen Ltd | Professional & scientific | 2021 |
| Going Green Assist Limited | Transport & logistics | 2014 |
| Golden WOK Oriental Limited | Hospitality | 2018 |
| Goldfields Investments Limited | Financial services | 2021 |
| Goonercass Limited | Real estate | 2017 |
| Govind & Sharda London Ltd | Wholesale & retail | 2025 |
| Grafton Real Estate Limited | Construction | 2018 |
| Gran Aventura Limited | Administrative & support | 2013 |
| Gravitai Ltd | Information & communication | 2013 |
| Gray Architecture Ltd | Professional & scientific | 2016 |
| Great Destinations Limited | Information & communication | 2018 |
| Greekolives Ltd | Wholesale & retail | 2024 |
| Green & Dionisi Ltd | Wholesale & retail | 2009 |
| Green Car Services Ltd | Other services | 2019 |
| Green Dynamo Ltd | Professional & scientific | 2017 |
| Groove City Ltd | Transport & logistics | 2023 |
| Gunfactory Studios Limited | Professional & scientific | 2010 |
| H.R. Harmer Ltd | Professional & scientific | 2012 |
| H2O Solutions Limited | Professional & scientific | 2022 |
| Hale Court Properties Limited | Real estate | 2016 |
| Hammers Lane Properties Limited | Other services | 2017 |
| Harford Estates Limited | Real estate | 1999 |
| Harper Health Limited | Health & social care | 2018 |
| Harris & Knight Limited | Real estate | 2020 |
| Hatton Garden Stones Ltd | Wholesale & retail | 2017 |
| Hawkview Properties Limited | Construction | 1993 |
| HBA UK Properties Limited | Real estate | 2022 |
| Heady MIX Productions Limited | Information & communication | 2014 |
| Hebpresto Limited | Real estate | 2024 |
| Henig Associates Limited | Administrative & support | 2013 |
| Hermes and Lynx Limited | Arts & recreation | 2025 |
| Heron Capital Ltd | Financial services | 2011 |
| Hertford Union Films Ltd | Information & communication | 2019 |
| High Water Holdings Limited | Professional & scientific | 2010 |
| Hillington Ltd | Real estate | 2006 |
| HLA Properties and Investments Limited | Real estate | 2022 |
| HLA Properties LLP | | 2017 |
| Hogan Building Services Ltd | Construction | 2012 |
| Holidays Empire UK Ltd | Administrative & support | 2014 |
| Hollies (Hendon Lane) Limited (the) | Households | 1971 |
| Homer Newco Limited | Administrative & support | 2009 |
| Horizon Care Solutions Limited | Health & social care | 2014 |
| Horizon Mediation Group Limited | Professional & scientific | 2026 |
| Hotel Management London Ltd | Professional & scientific | 2025 |
| House Extension Company London Limited | Construction | 2025 |
| HTI Holdings Ltd | Extraterritorial | 2018 |
| HU Property Management Ltd | Real estate | 2025 |
| Hurricane Broadband Ltd | Administrative & support | 2002 |
| HWD Holdings Limited | Financial services | 2017 |
| Hylands Capital Ltd | Financial services | 2023 |
| I Kraines Ltd | Wholesale & retail | 2016 |
| Iboo Clean Ltd | Administrative & support | 2023 |
| Icon Building Products Limited | Manufacturing | 2024 |
| Ignite Placements Ltd | Professional & scientific | 2021 |
| IJH Consultancy Limited | Professional & scientific | 2010 |
| Ikonica International Ltd | Financial services | 2020 |
| Imagineeruk Limited | Professional & scientific | 2012 |
| IMH Project Services Ltd | Professional & scientific | 2022 |
| Imix Concrete Ltd | Manufacturing | 2015 |
| Imix Group Limited | Financial services | 2022 |
| Important Decisions Limited | Professional & scientific | 1997 |
| Indefatigable Capital Ltd | Other services | 2022 |
| Indorama Trading (UK) Limited | Administrative & support | 2009 |
| Infinite 8 Productions Ltd | Arts & recreation | 2018 |
| Infinity Optical Holdings Limited | Financial services | 2023 |
| Infinity Optical Limited | Wholesale & retail | 2003 |
| Innventions Ellel Limited | Hospitality | 2018 |
| Innventions Hesketh Limited | Hospitality | 2018 |
| Inocula Ltd | Manufacturing | 2023 |
| Insightful Awareness Limited | Health & social care | 2023 |
| Inter Property Limited | Real estate | 2017 |
| Interbridge Transition Finance Limited | Financial services | 2015 |
| Interlinks Services Ltd | Transport & logistics | 2022 |
| International Stress Management Association UK | Health & social care | 2000 |
| Internet Projects Ltd | Information & communication | 2013 |
| Interni Decorative Design Limited | Arts & recreation | 2011 |
| Interstate Ventures Ltd. | Professional & scientific | 2018 |
| Ipump Concrete Services Limited | Construction | 2016 |
| Isabel Investments Limited | Real estate | 2014 |
| Italgold UK Limited | Wholesale & retail | 1974 |
| Italian Design Limited | Professional & scientific | 2006 |
| ITG Amisano 1967 Ltd | Wholesale & retail | 2026 |
| Itsat Solution Limited | Construction | 2010 |
| Izumi Maldon Limited | Hospitality | 2012 |
| J. Markfield Limited | Other services | 2000 |
| J. S. Health Limited | Wholesale & retail | 2011 |
| J.A.H.K. Limited | Wholesale & retail | 1976 |
| J.P. Kennedy Construction Company Limited | Construction | 2011 |
| Jambo Star Limited | Hospitality | 2019 |
| Japanese Knotweed Busters Limited | Arts & recreation | 2014 |
| JAS Archway Limited | Construction | 2015 |
| JAS Digby Limited | Construction | 2015 |
| JAS Holmbury Limited | Construction | 2006 |
| JDW Trading Limited | Extraterritorial | 2016 |