| Fleisch Team Ltd | Water & waste | 2024 |
| Fletcher Construction (Swindon) Ltd | Construction | 2018 |
| Fletcher's Heating Services Ltd | Construction | 2023 |
| Fletton House Management Company Limited | Households | 2010 |
| Flex Crew Limited | Transport & logistics | 2023 |
| Flightlink Chauffeurs Limited | Transport & logistics | 2020 |
| Flights Camera Action Ltd | Other services | 2022 |
| Flippingreatproperties Ltd | Real estate | 2025 |
| Floa Healthcare Ltd | Transport & logistics | 2020 |
| Floating Harbour Limited | Professional & scientific | 2016 |
| Flobby Care Ltd | Health & social care | 2020 |
| Floor Restorer Limited | Construction | 2015 |
| Floral Blues Ltd | Wholesale & retail | 2023 |
| Florence House (Wanborough) Management Company Limited | Households | 2018 |
| Florey Court and Peony House RTM Company Ltd | Households | 2022 |
| Florie KAY Couture Limited | Health & social care | 2013 |
| Florin Distribution Ltd | Other services | 2016 |
| Florin Grecea Ltd | Construction | 2014 |
| Florlee Limited Limited | Health & social care | 2024 |
| Floryb Limited | Health & social care | 2023 |
| Flourishing Care Solutions Limited | Health & social care | 2025 |
| Flourishtree Enterprises Limited | Health & social care | 2022 |
| Flow Expeditions and Consultancy Ltd | Administrative & support | 2022 |
| Flowsupplies Ltd | Wholesale & retail | 2021 |
| Fluff Software Limited | Information & communication | 2019 |
| Fluid Cool Consultant Ltd | Information & communication | 2025 |
| FM Transport Swindon Limited | Transport & logistics | 2024 |
| FMK Trading Ltd | Wholesale & retail | 2013 |
| FMP Services Ltd | Transport & logistics | 2025 |
| FMT Logistics Ltd | Transport & logistics | 2018 |
| FNF Catering Services Limited | Hospitality | 2025 |
| Foak Holding & Trading Ltd | Information & communication | 2024 |
| Focal Build Investments Limited | Other services | 2022 |
| Focus Communications Ltd | Professional & scientific | 2024 |
| Focus Web Studio Limited | Administrative & support | 2020 |
| Focusplain Limited | Real estate | 1999 |
| Folia (Europe) Ltd | Wholesale & retail | 1990 |
| Fonterra (Logistics) Limited | Transport & logistics | 1999 |
| Food Brands NOW Ltd | Professional & scientific | 2024 |
| Food Magpie Limited | Wholesale & retail | 2017 |
| Foodmandu Ltd | Hospitality | 2026 |
| Football FUN Factory (Community 117) Limited | Arts & recreation | 2024 |
| Footballcoaching Ltd | Arts & recreation | 2019 |
| Footy IQ Ltd | Administrative & support | 2024 |
| FOR Cleaning Sake Ltd | Administrative & support | 2026 |
| Foray Ltd | Construction | 2026 |
| Fords Only Limited | Wholesale & retail | 2012 |
| Forecourt Media Limited | Professional & scientific | 2021 |
| Forefront Leasing Ltd | Real estate | 2019 |
| Forefront Property Limited | Real estate | 2006 |
| Foregenix Ltd | Professional & scientific | 2009 |
| Foresight Controls Limited | Information & communication | 2018 |
| Forever Beauty and Nails Academy Limited | Education | 2021 |
| Forever Light Limited | Health & social care | 2011 |
| Forge & Flow Ltd | Education | 2025 |
| Forgepoint Ventures Limited | Professional & scientific | 2026 |
| Forging Fantastical CIC | Arts & recreation | 2023 |
| Formattion AI Ltd | Information & communication | 2024 |
| Fornek Ltd | Transport & logistics | 2016 |
| Fortanach Services Ltd | Manufacturing | 2020 |
| Fortdean Limited | Administrative & support | 2000 |
| Forte Brokers (Caledonia) Limited | Financial services | 2026 |
| Forte Brokers Limited | Financial services | 2025 |
| Fortitude Cyber Ltd | Information & communication | 2025 |
| Fortitude Labs Ltd | Manufacturing | 2026 |
| Forton Properties | Construction | 1960 |
| Fortuit Investments Ltd | Real estate | 2017 |
| Fortune Property Developers Ltd | Real estate | 2024 |
| Forty Falcons Limited | Agriculture & fishing | 2020 |
| Fortytech Limited | Information & communication | 2023 |
| Forum 145 Limited | Health & social care | 1995 |
| Forum Auto Parts Limited | Wholesale & retail | 2026 |
| Forvis Ltd | Hospitality | 2024 |
| Forward Option Services Limited | Health & social care | 2012 |
| Forward Slash Digital Limited | Professional & scientific | 2005 |
| Forward Step Physiotherapy Ltd | Health & social care | 2022 |
| Fouad Ltd | Wholesale & retail | 2025 |
| Foulser Roofing Limited | Construction | 2024 |
| Four Ace Infomatics Limited | Information & communication | 2013 |
| Four Angels Home Care Ltd | Health & social care | 2019 |
| Four Exhibitions Ltd | Administrative & support | 2024 |
| Four Financial Ltd | Administrative & support | 2023 |
| Four Forty Five Limited | Professional & scientific | 2016 |
| Four Seasons of Glastonbury Limited | Real estate | 1983 |
| Four Seasons Roofing Limited | Construction | 2014 |
| Four Sticks Investments Limited | Real estate | 2025 |
| Fourseasons Fruiterers Holdings Limited | Financial services | 2025 |
| Fourseasons Fruiterers Ltd | Wholesale & retail | 2014 |
| Foursight Consultancy Limited | Professional & scientific | 2026 |
| Fowler & Sons (Master Thatchers) Limited | Construction | 2011 |
| Fowler Architecture & Planning Limited | Professional & scientific | 2010 |
| FOX Bites Ltd | Manufacturing | 2026 |
| FOX Court Management Company Limited | Households | 2020 |
| FOX Event Management Ltd | Hospitality | 2024 |
| FOX Grips Limited | Other services | 2020 |
| FOX Miah Ltd | Administrative & support | 2018 |
| Foxhall Ltd | Other services | 2024 |
| Foxxed Ltd | Information & communication | 2026 |
| Fractionaliti Limited | Professional & scientific | 2025 |
| Frameco Ltd | Manufacturing | 2016 |