| Ficaw Ltd | Information & communication | 2011 |
| Field Marketing Solutions Limited | Professional & scientific | 2009 |
| Field View (Clanfield) Limited | Households | 2007 |
| Fieldview Partnership Limited | Extraterritorial | 2012 |
| Fifthocean Limited | Professional & scientific | 2002 |
| Fifthocean Properties Limited | Real estate | 2017 |
| Fifty One Degrees Ltd | Professional & scientific | 2013 |
| Fifty Shades of K Ltd | Other services | 2024 |
| Fill My Diary Ltd | Administrative & support | 2019 |
| Filmpro Transport Ltd | Transport & logistics | 2024 |
| Financial Solutions (Southern) Ltd | Financial services | 2018 |
| Finch GAS Services Ltd | Construction | 2008 |
| Finchdean Enterprises Limited | Construction | 2009 |
| Finchdean Ltd | Real estate | 2016 |
| Finding Case Limited | Wholesale & retail | 2013 |
| Findo Ltd | Information & communication | 2025 |
| Fine Bright Investment Ltd | Administrative & support | 2021 |
| Fine Oak Refurbishments Limited | Construction | 2006 |
| Fine Rooms Limited | Households | 2014 |
| Fine Timber Frames Limited | Construction | 2018 |
| Fineline Marketing Limited | Wholesale & retail | 2021 |
| Finesse Floors Ltd | Construction | 2011 |
| Finesse Formwork Finishing Ltd | Construction | 2011 |
| Finest Finish Ltd | Construction | 2024 |
| Finest Group (Farlington) Limited | Manufacturing | 2020 |
| Finishingtouch (West Sussex) Limited | Wholesale & retail | 2014 |
| Finlay Builders Limited | Construction | 2008 |
| Finley Place Management Company Limited | Households | 2009 |
| Finn Industrial Roofing Limited | Construction | 2017 |
| Finn Properties Ltd | Real estate | 2018 |
| Firchest Limited | Real estate | 2019 |
| Fire FIX Solutions Ltd | Construction | 2024 |
| Firefix Ltd | Construction | 2026 |
| Firemix Limited | Information & communication | 2003 |
| Firewire Surfboards UK Limited | Wholesale & retail | 2007 |
| Firgrove Bennett Limited | Construction | 2026 |
| Firmitas Financial Services Limited | Financial services | 2015 |
| Firmtop Property Management Limited | Households | 1991 |
| First Choice Equipment Ltd | Administrative & support | 2020 |
| First Choice First AID Ltd | Other services | 2023 |
| First Choice Pallets Limited | Wholesale & retail | 2018 |
| First Choice Paving Solutions Ltd | Construction | 2019 |
| First Choice Tax Solutions Ltd | Professional & scientific | 2016 |
| First Class Assets Limited | Real estate | 2016 |
| First Group Consultancy Limited | Administrative & support | 2023 |
| First Gunwharf Gate Management Company Limited | Households | 1986 |
| First Steps First AID Ltd | Health & social care | 2023 |
| First Time Motors Ltd | Wholesale & retail | 2025 |
| First Window & Doors Limited | Agriculture & fishing | 2003 |
| Firstforitrepairs Limited | Administrative & support | 2017 |
| Firstmate AI Ltd | Information & communication | 2025 |
| Fishbourne Limited | Hospitality | 2025 |
| Fisher Civils Limited | Construction | 2022 |
| Fisher Group Limited | Construction | 2025 |
| Fishon Bait N Tackle Ltd | Wholesale & retail | 2021 |
| Fit AS Studio Fitness Limited | Arts & recreation | 2022 |
| Fitaa Properties Ltd | Real estate | 2025 |
| Fitflite Limited | Transport & logistics | 2008 |
| Fittec Ltd | Manufacturing | 2024 |
| Fitz FM Ltd | Real estate | 2025 |
| Fitzgerald Holdings Limited | Administrative & support | 2021 |
| Fitzherbert Holdings Ltd | Professional & scientific | 2013 |
| Fitzherbert Road 2026 Limited | Real estate | 2026 |
| Fitzherbert Road Property Limited | Real estate | 2020 |
| Fitzherbert Spur Limited | Real estate | 2020 |
| Fitzpatrick Enterprises Limited | Manufacturing | 2018 |
| Fitzroy Court Management Company Limited | Professional & scientific | 1982 |
| Fitzroy Metals Ltd | Professional & scientific | 2019 |
| Fitztech Machining Ltd | Manufacturing | 2007 |
| Five Elements Holding Ltd | Financial services | 2025 |
| FIX My Crown Ltd | Other services | 2022 |
| Fix-It General Repairs Ltd | Other services | 2026 |
| Fizzy Print Ltd | Manufacturing | 2013 |
| FJE Retail Ltd | Wholesale & retail | 2025 |
| FK Fastfood Ltd | Hospitality | 2022 |
| FL Automotive Ltd | Wholesale & retail | 2025 |
| Flame & Slice Ltd | Hospitality | 2026 |
| Flame Trans Limited | Transport & logistics | 2023 |
| Flamingo Booths Limited | Administrative & support | 2024 |
| Flamingo Boss Limited | Arts & recreation | 2022 |
| Flat Guru Ltd | Real estate | 2026 |
| Flat Pack Living Ltd | Extraterritorial | 2017 |
| Flats a & B 120 New Road Portsmouth Limited | Real estate | 2013 |
| Flavour Street Pompey Limited | Hospitality | 2025 |
| Flavouroo Limited | Hospitality | 2018 |
| Fleet Sales Direct Limited | Wholesale & retail | 2019 |
| Flex Gymnastics Club Ltd | Arts & recreation | 2019 |
| Flip the Review Ltd | Information & communication | 2025 |
| Flitefilms Ltd | Information & communication | 2018 |
| Flockatter Ltd | Extraterritorial | 2021 |
| Flora Cafe Ltd | Hospitality | 2024 |
| Flora Coffee Ltd | Hospitality | 2025 |
| Flora Florist Ltd | Wholesale & retail | 2024 |
| Florence Fooderia Ltd | Hospitality | 2025 |
| Florence Marine X Europe Limited | Wholesale & retail | 2021 |
| Florence Osbourn Limited | Information & communication | 2022 |
| Florio's Ltd | Hospitality | 2014 |
| Flow & Pressure Technology Limited | Professional & scientific | 2019 |
| Flow and Maintenance Co Ltd | Construction | 2026 |
| Flow Pundits Ltd | Information & communication | 2024 |