| FGO Trans Limited | Transport & logistics | 2019 |
| FIC Prop Limited | Real estate | 2024 |
| Fidliz Interiors Ltd | Construction | 2018 |
| Fiduciary Investments Limited | Real estate | 2014 |
| Filmnest Limited | Information & communication | 2025 |
| Filote Limited | Transport & logistics | 2014 |
| Filter Group Limited | Information & communication | 2026 |
| Final Touch Decor Ltd | Other services | 2025 |
| Fincrew Limited | Construction | 2021 |
| Find a Car Finance Limited | Administrative & support | 2007 |
| Find a Car UK Limited | Wholesale & retail | 2005 |
| Find My Broker Ltd | Information & communication | 2025 |
| Findacarer Ltd | Information & communication | 2010 |
| Finest Autos Limited | Wholesale & retail | 2016 |
| Finest Cars Limited | Wholesale & retail | 2019 |
| Finli UK Limited | Financial services | 2025 |
| Fioladem Limited | Information & communication | 2020 |
| Fire Shield Interiors Ltd | Construction | 2025 |
| Fireaway Gravesend Limited | Hospitality | 2021 |
| Fireaway Walsall Ltd | Hospitality | 2021 |
| Firecrest Services Limited | Public administration | 2026 |
| Firecrest Systems Limited | Construction | 2025 |
| Firemate Ltd | Construction | 2017 |
| Firemed Events Limited | Public administration | 2019 |
| Firmin and Associates Ltd | Professional & scientific | 2018 |
| First Choice Interior (London) Ltd | Construction | 2023 |
| First Class Barber Gravesend Limited | Other services | 2022 |
| First Construction Group Ltd | Construction | 2024 |
| First Energy Group Ltd | Construction | 2022 |
| First Handyman Ltd | Construction | 2020 |
| First Heathlands Management Company (Crayford) Limited | Households | 1989 |
| First Little Steps Ltd | Health & social care | 2025 |
| First Plumbers & Electricians Ltd | Construction | 2017 |
| First Point Electrics Limited | Construction | 2019 |
| First Properties & Investments Ltd | Real estate | 2020 |
| FIRST4DRAINS Ltd | Construction | 2018 |
| FIRST4VANS Ltd | Wholesale & retail | 2024 |
| Firsthood Cyber Focus Ltd | Information & communication | 2020 |
| Fish Resourcing Group Limited | Health & social care | 2022 |
| Fisherman’S NET Food Ltd | Hospitality | 2025 |
| Fitbase Club Ltd | Arts & recreation | 2018 |
| Fitcontour Limited | Extraterritorial | 2025 |
| Fitness at Work and Healthcare Ltd. | Health & social care | 2017 |
| Fitolmed Ltd | Health & social care | 2025 |
| Fitscape Limited | Health & social care | 2021 |
| Fitzcarpentry Ltd | Construction | 2022 |
| Five Rise Ltd | Professional & scientific | 2025 |
| FIX Auto Gravesend Limited | Wholesale & retail | 2023 |
| FIX Design and Build Ltd | Other services | 2023 |
| FIX Electrical & Plumbing Limited | Construction | 2021 |
| FJR Limited | Construction | 2015 |
| FKD Logistics Ltd | Transport & logistics | 2020 |
| FL Real Estate Investments Ltd | Real estate | 2024 |
| Flair Refurbishments Ltd | Real estate | 2025 |
| Flamebox Ltd | Hospitality | 2025 |
| Flamestar Ltd | Construction | 2023 |
| Flanders Court Management Ltd. | Households | 2011 |
| Flar Group Ltd | Professional & scientific | 2025 |
| Fleet Commercial Cleaning Limited | Administrative & support | 2018 |
| Fleet Construction Ltd | Extraterritorial | 2024 |
| Fleet Security Installations Ltd | Administrative & support | 2024 |
| Fleetserve 24 Ltd | Wholesale & retail | 2023 |
| Flemings Fire Protection Ltd | Public administration | 2025 |
| Flemings Joinery Ltd | Manufacturing | 2021 |
| Flex Fitness 24/7 Ltd | Arts & recreation | 2023 |
| Flex Scaffolding Services Ltd | Construction | 2024 |
| Flexibit PAY Limited | Transport & logistics | 2025 |
| Flextech Global Limited | Information & communication | 2012 |
| FLIGHT57 Ltd | Arts & recreation | 2026 |
| Flip Finesse Records Ltd | Information & communication | 2021 |
| Flips Properties Ltd | Real estate | 2022 |
| FLO Well Drainage & Plumbing Ltd | Construction | 2017 |
| Flo&Lu Construction Ltd | Construction | 2018 |
| Floor Preparation Ltd | Construction | 2014 |
| Flooring and Interior Design Management Limited | Wholesale & retail | 2009 |
| Flori Builders Limited | Construction | 2024 |
| Flotech Consultants Limited | Administrative & support | 2009 |
| Flotransport Ltd | Transport & logistics | 2014 |
| Flowbiz Ltd | Information & communication | 2025 |
| Flowgas Ltd | Construction | 2018 |
| Flowsync Limited | Professional & scientific | 2014 |
| FLY Joinery Ltd | Construction | 2015 |
| FLY Properties Ltd | Real estate | 2025 |
| Flying Obsidian Ltd | Information & communication | 2025 |
| Flymax Luggage Ltd | Wholesale & retail | 2012 |
| FM Social Ltd | Arts & recreation | 2022 |
| Fmdk Services Limited | Real estate | 2025 |
| Focus Care and Support Services Limited | Health & social care | 2014 |
| Folk London Publishing Community Interest Company | Information & communication | 2020 |
| Folkestone Property Investment Limited | Real estate | 2014 |
| FOMAX1 Ltd | Transport & logistics | 2015 |
| Fomoke and Company Limited | Construction | 2020 |
| Fonclaire Limited | Professional & scientific | 2023 |
| FOOD4U (UK) Ltd | Wholesale & retail | 2006 |
| Footwebb Limited | Wholesale & retail | 2019 |
| FOR Dog Lovers Ltd | Wholesale & retail | 2020 |
| Forbidden Cities Ltd | Information & communication | 2023 |
| Foreknown-Predestined Limited | Financial services | 2017 |
| Forest School Blooming Minds Ltd | Education | 2024 |
| Forethought Services Ltd | Administrative & support | 2022 |