| Fantastic Gardeners Ltd | Administrative & support | 2014 |
| Fantastic Pet Care Ltd | Extraterritorial | 2014 |
| Fantastic Removals Ltd | Extraterritorial | 2017 |
| Farm Way Holdings Ltd | Financial services | 2024 |
| Fine Spirits Ltd | Hospitality | 2026 |
| Finsol Associates Limited | Professional & scientific | 2025 |
| Finsol Finance Limited | Professional & scientific | 2010 |
| Finsol Group Ltd | Administrative & support | 2022 |
| Finsol Properties Ltd | Construction | 2024 |
| Finsol Tax Advisors Limited | Professional & scientific | 2009 |
| Finsol Wealth and Asset Management Limited | Administrative & support | 2022 |
| Finvasia Capital Holding Limited | Financial services | 2023 |
| First Choice Portugal & Spain Ltd | Real estate | 2024 |
| First Class Automotive Ltd | Wholesale & retail | 2021 |
| First Global (India) Holdings Ltd | Financial services | 2005 |
| First Global (UK) Ltd. | Financial services | 1998 |
| First Northolt Limited | Real estate | 2020 |
| Fit Fast UK Ltd | Arts & recreation | 2014 |
| Fitted Wardrobes Specialist Ltd | Wholesale & retail | 2018 |
| FLY Fitness (U.K) Ltd | Arts & recreation | 2017 |
| Fortune Finance Ltd | Professional & scientific | 2023 |
| Foxcastle Limited Partnership | | 1997 |
| Frazer Designers Limited | Professional & scientific | 1978 |
| FUNDING2DAY Ltd | Financial services | 2023 |
| Fxview UK Ltd | Information & communication | 2019 |
| Gamlingay Pharmacy Limited | Wholesale & retail | 2005 |
| Genesis Care Homes Ltd | Real estate | 2021 |
| George Fraser Mercedes Limited | Wholesale & retail | 2023 |
| Globalday Limited | Administrative & support | 1993 |
| GNR Estates Limited | Real estate | 2013 |
| GR Retail Limited | Wholesale & retail | 2016 |
| Grange Road Management Company Limited | Households | 1968 |
| Grasdene Limited | Professional & scientific | 2019 |
| Greville Court Residents Limited | Households | 1999 |
| GS Infrastructure Investments Limited | Real estate | 2021 |
| Guardian Resources (UK) Limited | Professional & scientific | 2016 |
| Haggar Broadcast Solutions Ltd | Administrative & support | 2023 |
| Halo Care Holdings Limited | Financial services | 2022 |
| Halo Care Property Limited | Real estate | 2016 |
| Hamden Wick Surveying Services Limited | Professional & scientific | 2013 |
| Hare in the Gate Express Limited | Transport & logistics | 2006 |
| Hari OM Retail Ltd | Wholesale & retail | 2024 |
| Harrington Care Homes (Aylesbury) Ltd | Health & social care | 2025 |
| Harrington Property (Bushey) Ltd | Construction | 2024 |
| Harrington Property (Reading) Ltd | Real estate | 2024 |
| Harrington Property (Twickenham) Ltd | Health & social care | 2026 |
| Harrovian Capital Ltd | Real estate | 2016 |
| Harrow Gateway | Arts & recreation | 1999 |
| Hassans Limited | Wholesale & retail | 2019 |
| Hbnb Holdings Limited | Professional & scientific | 2018 |
| Headstone Lane Dental Practice Limited | Health & social care | 2017 |
| Healthandsocialecare.Com Ltd. | Information & communication | 2019 |
| Heart on My Shelf Limited | Information & communication | 2024 |
| Heckhaus Studios Ltd | Wholesale & retail | 2026 |
| Hemp Factory UK Ltd | Hospitality | 2019 |
| Henley Lofts Limited | Real estate | 2015 |
| Henwell Ltd | Wholesale & retail | 2025 |
| HHG1 Nottingham Limited | Hospitality | 1983 |
| HHG2 Southampton Limited | Hospitality | 2021 |
| HHG4 Acton Limited | Hospitality | 2025 |
| Hkrs Consultancy Ltd | Professional & scientific | 2012 |
| Hoellers Consulting Ltd | Administrative & support | 2025 |
| Holly House (Northampton) Limited | Health & social care | 2019 |
| HSH Ventures Limited | Real estate | 2023 |
| HSM Perpetual Holdings Limited | Financial services | 2024 |
| Hungry Birds (Kingsbury) Ltd | Hospitality | 2024 |
| Hunter Group Security Limited | Administrative & support | 2021 |
| I SEE HUE Limited | Information & communication | 2012 |
| Iamalan Ltd | Administrative & support | 2010 |
| Iceberg-Blue Limited | Extraterritorial | 2010 |
| Ikkon Limited | Construction | 2012 |
| Inbox Infotech Ltd | Information & communication | 2025 |
| Indipay Limited | Administrative & support | 2011 |
| Infinity One Investments Limited | Financial services | 2024 |
| Infinity One Limited | Real estate | 2021 |
| Infraexcel Limited | Information & communication | 2015 |
| Ingage Media Ltd | Professional & scientific | 2013 |
| Investment Focus Limited | Real estate | 2007 |
| Ivycourt Limited | Wholesale & retail | 1997 |
| J&S Home Solutions Ltd | Construction | 2020 |
| JAG Medical Services Ltd | Health & social care | 2025 |
| Jaksis Ltd | Wholesale & retail | 2024 |
| Jaksis Properties Ltd | Real estate | 2026 |
| Japanese Acupuncture Limited | Health & social care | 2005 |
| JAY Bhavani UK Ltd | Hospitality | 2025 |
| Jay&Ee Logistics Ltd | Transport & logistics | 2024 |
| JB Venture Group Limited | Construction | 2025 |
| JB Wembley Ltd | Hospitality | 2025 |
| Jd-Homes (Hertfordshire) Limited | Real estate | 2022 |
| Jeremy Kaye Portfolio Management Limited | Financial services | 2009 |
| Jiba International | Other services | 1993 |
| JM Motors Ltd | Wholesale & retail | 2013 |
| Jose Electrical Services Limited | Other services | 2011 |
| Joy Consulting Ltd | Administrative & support | 2011 |
| JP International Limited | Water & waste | 2017 |
| Juju Immersive Limited | Information & communication | 2017 |
| Julian Carter Studio Limited | Administrative & support | 2008 |
| Juniper Fitness Ltd | Arts & recreation | 2013 |
| K a S Properties Limited | Construction | 2000 |
| K P Optical (London) Limited | Health & social care | 2011 |