| Firth Property Management Limited | Real estate | 2025 |
| Firwood Finance Limited | Financial services | 2020 |
| Fiscala Limited | Financial services | 2021 |
| Fish Cafe Beach Limited | Hospitality | 2016 |
| Fishbourne Estates LLP | | 2008 |
| Fishing Life Ltd | Wholesale & retail | 2024 |
| Fit & Easy Limited | Other services | 2008 |
| Fit 4 HER Limited | Health & social care | 2024 |
| Fit 4 Life Hants CIC | Education | 2025 |
| Fit Happens Ltd | Arts & recreation | 2025 |
| Fit Perfect Ltd | Wholesale & retail | 2019 |
| Fit Treat Company Ltd | Hospitality | 2018 |
| Fitness Factory Hampshire Limited | Arts & recreation | 2021 |
| Fitness for Accountants Limited | Health & social care | 2025 |
| Fitout Logistical Services Ltd | Transport & logistics | 2009 |
| Fitrah Sips | Education | 2010 |
| Fitskool Limited | Education | 2009 |
| Fitzgerald Electrical Services Ltd | Construction | 2026 |
| Fitzsimmons & Sons Ltd | Construction | 2023 |
| Five Commercial Consulting Ltd | Professional & scientific | 2022 |
| Five Five Media Ltd | Information & communication | 2016 |
| Five of US Ltd | Hospitality | 2022 |
| Five One Two Digital Ltd | Information & communication | 2008 |
| Five River Finance Ltd | Financial services | 2015 |
| Fivedom Properties Ltd | Real estate | 2024 |
| Fivetrees Ltd | Information & communication | 2003 |
| FIX My Plumbing and Drains Ltd | Construction | 2018 |
| FIX My Ride Ltd | Wholesale & retail | 2025 |
| FIX Quick Ltd | Manufacturing | 2021 |
| FIX the Trend Ltd | Wholesale & retail | 2025 |
| FIX Volt Ltd | Construction | 2025 |
| Fixmore Ltd | Construction | 2025 |
| Fixpoint Solutions Ltd | Information & communication | 2025 |
| Fixt’It Limited | Wholesale & retail | 2025 |
| FJ Lifts Limited | Manufacturing | 2015 |
| FKH Services Limited | Transport & logistics | 2022 |
| FL Consultancy Services Limited | Professional & scientific | 2022 |
| FLA Scaffolding Ltd | Construction | 2024 |
| Flagship Coffee Limited | Hospitality | 2024 |
| Flamant Construction Ltd | Real estate | 2021 |
| Flame & Flavor Limited | Hospitality | 2024 |
| Flame Grill Woollaston Limited | Hospitality | 2025 |
| Flamingo Accounting Limited | Professional & scientific | 2017 |
| Flare Football Club Ltd | Arts & recreation | 2023 |
| Flare Velo Ltd | Wholesale & retail | 2026 |
| Flash FIX Construction Ltd | Construction | 2025 |
| Flashlight Translations Ltd | Professional & scientific | 2022 |
| Flat 16 Limited | Real estate | 2020 |
| Flat CAP Holding Company Limited | Manufacturing | 2018 |
| Flat Rent Ltd | Real estate | 2025 |
| Flat Spaces (Ropley) Ltd | Health & social care | 2013 |
| Flat Spaces Foundation | Hospitality | 2014 |
| Flatfish Events Limited | Hospitality | 2018 |
| Flats 1-7 RTM Company Limited | Households | 2025 |
| Flats in Southsea Ltd | Households | 2018 |
| Flavour Fiesta Warehouse Limited | Wholesale & retail | 2025 |
| Flawless Therapies Limited | Other services | 2025 |
| Flaxbot Ltd | Information & communication | 2024 |
| Fleet Centre Limited | Wholesale & retail | 2026 |
| Fleet Change Consulting Ltd | Professional & scientific | 2026 |
| Fleet Homes (2000) Limited | Construction | 1997 |
| Fleet Homes Limited | Construction | 2021 |
| Fleet One Ltd | Transport & logistics | 2024 |
| Fleetwater Marine Limited | Wholesale & retail | 2001 |
| Fleming Court Limited | Real estate | 2019 |
| Fletcherjohn Builders Limited | Construction | 2006 |
| Fletchwood Investment Company Limited | Financial services | 2025 |
| Fleur Crudeli Limited | Other services | 2006 |
| Flexford Holdings Ltd | Financial services | 2018 |
| Flexford Mill LLP | | 2008 |
| Flexfresh Ltd | Manufacturing | 2025 |
| Flexible Heating Services Ltd | Construction | 2018 |
| Flexink Ltd | Professional & scientific | 2007 |
| Flexisail Ltd | Arts & recreation | 2024 |
| Flexitec Covers LLP | | 2015 |
| Flexitec Structures Limited | Manufacturing | 1995 |
| Flexiteek Islands Limited | Manufacturing | 2016 |
| Flexiteek Ltd | Manufacturing | 2017 |
| Flexpipe Solutions Ltd | Professional & scientific | 2026 |
| Flexpro Force Limited | Transport & logistics | 2025 |
| FLG Stores Ltd | Arts & recreation | 2013 |
| Flggd UK Ltd | Information & communication | 2026 |
| Fliaqat Ltd | Wholesale & retail | 2025 |
| Flint & Tinder Limited | Financial services | 2016 |
| Flint Business Services Ltd | Administrative & support | 2025 |
| Flintapps Ltd | Wholesale & retail | 2025 |
| Flintstone Tyre Services | | 2003 |
| Flip N Tails Seafoods Limited | Wholesale & retail | 2020 |
| Flipping Ace Limited | Real estate | 2026 |
| Flipping Development Limited | Information & communication | 2025 |
| Flique 1 Ltd | Other services | 2017 |
| Flite Electronics International Limited | Information & communication | 2001 |
| FLO Images Studio Limited | Professional & scientific | 2025 |
| FLO Reformer Pilates Ltd | Arts & recreation | 2026 |
| FLO UK Trans Limited | Transport & logistics | 2019 |
| Flo's Garden Care Ltd | Construction | 2025 |
| Flobard Limited | Transport & logistics | 2015 |
| Flockton Plant Hire Limited | Wholesale & retail | 1964 |
| Flocon DE Neige Ltd | Professional & scientific | 2024 |
| Floods Plumbing & Heating Ltd | Construction | 2003 |