| Fidelity Systems Limited | Information & communication | 1996 |
| Field & Hawken Ltd | Wholesale & retail | 2013 |
| Firco Ventures Ltd | Hospitality | 2022 |
| Firework Services UK Ltd | Other services | 2014 |
| First Class Tree Surgeons Limited | Administrative & support | 2026 |
| Firth Road Partnership | | 2008 |
| Fischer Fixings UK Limited | Wholesale & retail | 1969 |
| Fisher Consulting Services Limited | Professional & scientific | 2001 |
| Fisikal Limited | Arts & recreation | 2008 |
| Fitedge Ltd | Construction | 2024 |
| Fittever Ltd | Arts & recreation | 2017 |
| Fitzroy Gate (Lisa Estates) Residents Management Company Limited | Households | 2016 |
| Fletcher Plumbing & Heating Ltd | Construction | 2021 |
| FLJ Consulting Limited | Information & communication | 2020 |
| Flow-Well Construction Limited | Construction | 2010 |
| Fluid Engineered Solutions Ltd | Professional & scientific | 2016 |
| Fluid Management and Calibration Limited | Professional & scientific | 2004 |
| FLY Tiger Moth Limited | Transport & logistics | 2013 |
| Flyingfox Consulting Limited | Education | 2017 |
| Fmcgtalent Ltd | Administrative & support | 2025 |
| Focus MGT Limited | Professional & scientific | 2017 |
| Focus Redwood Accounting Ltd | Professional & scientific | 2026 |
| Folklore London Limited | Professional & scientific | 2026 |
| Format Intelligence Ltd | Information & communication | 2011 |
| Fortnums Estates Ltd | Real estate | 2023 |
| Four Points Advisory Limited | Professional & scientific | 2019 |
| Four Ways Healthy Ltd | Wholesale & retail | 2023 |
| Fourkeys (Wallingford) LLP | | 2017 |
| Fraxis Ltd. | Professional & scientific | 2023 |
| Frebilan Limited | Information & communication | 2014 |
| Fred's Hospitality Limited | Hospitality | 2026 |
| Freezeshakes Limited | Hospitality | 2023 |
| Frenix Limited | Wholesale & retail | 2000 |
| Friends for Living Ltd | Professional & scientific | 2018 |
| Frizzell Wealth Management Limited | Financial services | 2020 |
| Frost Corp Limited | Real estate | 2020 |
| Froth Blowers Brewing Company Ltd | Manufacturing | 2012 |
| Fugro GB Limited | Professional & scientific | 1973 |
| Fugro Geoservices Limited | Professional & scientific | 1976 |
| Fugro Holdings Limited | Professional & scientific | 1993 |
| Fugro Pension Trustees Limited | Financial services | 2006 |
| Fugro Pensions Limited | Professional & scientific | 1981 |
| Fugro Properties Limited | Real estate | 1998 |
| Full Circle Travel Limited | Administrative & support | 2002 |
| Full Potential Performance Ltd | Arts & recreation | 2009 |
| Future Chain Advisory Ltd | Professional & scientific | 2026 |
| G'Day Kombis Limited | Wholesale & retail | 2009 |
| Gabriel Sebastian Properties Limited | Real estate | 2023 |
| George Street Properties Limited | Real estate | 2020 |
| George Verno Properties Limited | Real estate | 1969 |
| Gladstone Limited | Professional & scientific | 1997 |
| Glasspond Limited | Professional & scientific | 2015 |
| Glavani Limited | Financial services | 2025 |
| Glendale Surveyors Limited | Professional & scientific | 2008 |
| GLM Property Ltd | Real estate | 2023 |
| Global Hotel Consulting Ltd | Hospitality | 2018 |
| Go Simulate Limited | Information & communication | 2007 |
| Gold Sustainable Holdings Limited | Real estate | 2022 |
| Golden AGE of Tennis Ltd | Wholesale & retail | 2020 |
| Goldsmith Ball Ltd | Professional & scientific | 2015 |
| Goodson Electrical Limited | Construction | 2018 |
| Gotaludev Ltd | Professional & scientific | 2023 |
| Gracely Construction Limited | Construction | 2021 |
| Green 4 Solutions Limited | Information & communication | 2005 |
| Green Factory Limited | Construction | 2002 |
| Green Lane Partners Ltd | Professional & scientific | 2011 |
| Green Light Laboratories Limited | Professional & scientific | 2015 |
| Green World Technology Limited | Water & waste | 2017 |
| Greenart Garden Care and Development Limited | Administrative & support | 2020 |
| Greenart Garden Design and Landscaping Limited | Administrative & support | 2015 |
| Greenwood Generation Limited | Financial services | 2023 |
| Greycon Limited | Information & communication | 1984 |
| Grndup Group Ltd | Construction | 2026 |
| Grosvenor (Berkshire) Limited | Real estate | 2000 |
| Groundwell Consulting Limited | Professional & scientific | 2006 |
| Group GA Ltd | Professional & scientific | 2005 |
| Grove Park Residents Management Limited | Households | 2026 |
| Growgrass Ltd | Education | 2020 |
| Growingthegame Ltd | Arts & recreation | 2010 |
| Grundon Sand & Gravel Limited | Mining & quarrying | 1947 |
| Grundon Waste Management Limited | Water & waste | 2001 |
| GSD Improvements Limited | Professional & scientific | 2024 |
| GT Pro Engineering Supplies Ltd | Wholesale & retail | 2025 |
| GUY Houghton Ltd. | Professional & scientific | 2016 |
| Gwilym Court (Wallingford) Associates Limited | Households | 1991 |
| H T Carpentry and Joinery Limited | Manufacturing | 2026 |
| H.B Programming Limited | Education | 2025 |
| Hagstone Theatre Ltd | Arts & recreation | 2023 |
| Haig Hotels Limited | Hospitality | 2020 |
| Haines Secretaries Ltd | Administrative & support | 2002 |
| Hamilton Accounts Limited | Professional & scientific | 2020 |
| Handsmooth Farm Ltd | Agriculture & fishing | 2024 |
| Hankinson Duckett Associates Limited | Professional & scientific | 1997 |
| Hanning Homes Bidco Limited | Financial services | 2024 |
| Hanning Homes Care Limited | Health & social care | 2024 |
| Hanning Homes Limited | Health & social care | 2024 |
| Hanning Homes Midco Limited | Financial services | 2024 |
| Hanning Homes TOV Moulsford Limited | Health & social care | 2024 |
| Hare Hops Brewing Ltd | Financial services | 2021 |
| Harold Michael Properties Limited | Real estate | 2018 |