| Fire & Security Systems Ltd | Administrative & support | 2024 |
| Fire Fort Ltd | Construction | 2022 |
| Fire Protection Surveys Limited | Construction | 2017 |
| Fire Safety at Work Limited | Public administration | 2010 |
| Fire-Corp Passive Fire Protection Limited | Construction | 2021 |
| Fire-Corp Secure Solutions Ltd | Administrative & support | 2017 |
| Fireaway Franchise Limited | Administrative & support | 2020 |
| Firebunny Limited | Information & communication | 2019 |
| Firecrest UK Ltd | Public administration | 2004 |
| Firesec Installations Ltd | Construction | 2022 |
| Firetrap Limited | Professional & scientific | 2009 |
| First AID Training Solutions Ltd | Administrative & support | 2007 |
| First Born Camping Ltd | Manufacturing | 2024 |
| First Call Windows and Doors Ltd | Manufacturing | 2021 |
| First Choice Property Services Ltd | Real estate | 2026 |
| First Class Tailored Solutions Holdings Limited | Financial services | 2025 |
| First Class Tailored Solutions Limited | Administrative & support | 2011 |
| First Effect Limited | Administrative & support | 2008 |
| First Properties (Nottingham) Limited | Construction | 1994 |
| Firstchoice Aggregates Ltd | Wholesale & retail | 2026 |
| Firstclasslocksmiths Ltd | Wholesale & retail | 2023 |
| Firstlink Healthcare Ltd | Health & social care | 2016 |
| Fishcomm Limited | Information & communication | 2015 |
| Fit Mode Apparel Ltd | Manufacturing | 2019 |
| Fit Mode Ltd | Arts & recreation | 2016 |
| Fit OUT Ltd | Construction | 2024 |
| Fitfutur Limited | Wholesale & retail | 2025 |
| Fitta Door Limited | Construction | 2014 |
| Fitted Home Ltd. | Construction | 2019 |
| Fitwell 4 Life Ltd | Health & social care | 2019 |
| Five Rivers Property Management Limited | Real estate | 2017 |
| FIVE97 Moto Limited | Manufacturing | 2025 |
| Fivebi Ltd | Hospitality | 2024 |
| FIX M UP Motors Limited | Wholesale & retail | 2022 |
| FKB Claims Solutions Ltd | Financial services | 2017 |
| Flagship Contracts Limited | Construction | 2024 |
| Flame & Fold Chippy Ltd | Hospitality | 2026 |
| Flames Trading Limited | Hospitality | 2023 |
| Flash Engineering Ltd. | Professional & scientific | 2018 |
| Fletcher & Co Property Ltd | Real estate | 2025 |
| Flexiaid Ltd | Health & social care | 2024 |
| Flly Limited | Manufacturing | 2024 |
| Flo&Poto Delivery Ltd | Transport & logistics | 2025 |
| Florin Nicolae Transport Limited | Transport & logistics | 2026 |
| Florin Transport Ltd | Transport & logistics | 2025 |
| Florina Cleaning Services Ltd | Administrative & support | 2021 |
| Flowerline Limited | Wholesale & retail | 2013 |
| Flowers by Touch of Charm Ltd | Wholesale & retail | 2022 |
| Flowers to Yours Limited | Wholesale & retail | 2019 |
| Fluffy Indulgence Ltd | Hospitality | 2024 |
| Fluid GAS Limited | Manufacturing | 2014 |
| Flysight Space Ltd | Extraterritorial | 2020 |
| FM Sudafix Group Ltd | Manufacturing | 2009 |
| FN Transport Ltd | Transport & logistics | 2016 |
| Fnav Property Investments Limited | Real estate | 2023 |
| Fogg Travel Limited | Financial services | 2020 |
| Fomo Digital Marketing Ltd | Wholesale & retail | 2021 |
| Fones Corner Ltd | Wholesale & retail | 2024 |
| Food Junction (Mansfield) Limited | Hospitality | 2025 |
| Foodfilment Ltd | Manufacturing | 2025 |
| Football Monthly Limited | Information & communication | 2002 |
| Force Imports Ltd | Wholesale & retail | 2024 |
| Fordshaw Homes Limited | Real estate | 2023 |
| Fordtek Ltd | Wholesale & retail | 2016 |
| Foresight Fintelligence Ltd | Information & communication | 2025 |
| Forest Town Arena Ltd | Hospitality | 2025 |
| Forest Town Car Wash Ltd | Administrative & support | 2025 |
| Forest Town Tyre Centre Ltd | Wholesale & retail | 2026 |
| Forest Veterinary Clinic Limited | Professional & scientific | 2011 |
| Forever Puppy Ltd | Agriculture & fishing | 2020 |
| Forge Creations Ltd | Hospitality | 2017 |
| Forrest Williams Legal Limited | Administrative & support | 2011 |
| Fort Halstead Estates Limited | Construction | 2022 |
| Fortcare Limited | Health & social care | 2025 |
| Fortifi Ltd | Professional & scientific | 2025 |
| Fortreal Estates Limited | Real estate | 2026 |
| Fortuitapps Limited | Information & communication | 2014 |
| Fortune FC Ltd | Construction | 2018 |
| Forward Protective Coatings Limited | Construction | 2002 |
| Foster Financial Solutions Limited | Financial services | 2017 |
| Four Seasons Homes Ltd | Real estate | 2019 |
| Four Seasons Lawn Care Limited | Administrative & support | 2010 |
| FOX & Co Interiors Limited | Construction | 2022 |
| FOX Design Services Limited | Professional & scientific | 2019 |
| Foxcote Farm Limited | Agriculture & fishing | 2003 |
| Foxglove Kitchens and Joinery Limited | Construction | 2019 |
| Foxxweb Design Limited | Information & communication | 2014 |
| Foxy PUB Company Limited | Hospitality | 2025 |
| FPV Drone Fest Ltd | Arts & recreation | 2023 |
| Fraany Ltd | Health & social care | 2022 |
| Framework System Limited | Professional & scientific | 2024 |
| Francis & Sons Haulage Limited | Transport & logistics | 2024 |
| FRANEK2GO Ltd | Transport & logistics | 2022 |
| Frank Associates UK Limited | Professional & scientific | 2024 |
| Frankie Entertainment Ltd | Information & communication | 2014 |
| Frankjodan Ltd | Information & communication | 2023 |
| Fraser Partnership Limited | Financial services | 2013 |
| FRB Construction Services Limited | Construction | 2022 |
| Fredbey Ltd | Hospitality | 2025 |
| Freedom Innovations Limited | Transport & logistics | 2025 |