| Fish R US (Rose Hill) Limited | Hospitality | 2018 |
| Fishermans Wharf Management (Kingsmead) Limited | Households | 2004 |
| Fit Futures Limited | Health & social care | 2025 |
| Fit Therapy Ltd | Arts & recreation | 2026 |
| Fit to Last Limited | Health & social care | 2013 |
| Fitado Mclean's Properties Ltd | Real estate | 2026 |
| Fitfilmproduction Limited | Information & communication | 2023 |
| Fitness Food Ltd | Wholesale & retail | 2023 |
| Fitness Trade Limited | Wholesale & retail | 2020 |
| Fitpro Kitchens and Bathrooms Ltd | Construction | 2023 |
| Fittowork Ltd | Construction | 2016 |
| Fitzgerald Lodge Management Company Limited | Households | 2004 |
| Fitzgerald Mithia Springer Ltd | Professional & scientific | 2021 |
| Five by Five Productions Ltd | Information & communication | 2025 |
| Five Colworth Road Management Company Limited | Households | 1998 |
| Five Elements Group Ltd | Real estate | 2023 |
| Five Oaks Knutsford Management Company Limited | Households | 2017 |
| Five Star Deals UK Limited | Other services | 2022 |
| Five Star Facilities & Cleaning Ltd | Transport & logistics | 2023 |
| Five Thornhill Road Maintenance Ltd | Hospitality | 1997 |
| Five Ways Fish & Chips Ltd | Hospitality | 2024 |
| Five Ways Newsagent Limited | Wholesale & retail | 2003 |
| Fivehound Dog Productions Ltd | Information & communication | 2025 |
| Fivetwelve Consultancy Limited | Professional & scientific | 2023 |
| Fiveways Brighton Limited | Hospitality | 2018 |
| FIX Electrical London Ltd | Construction | 2024 |
| Fix&Build Ltd | Construction | 2025 |
| Fixedpips Limited | Information & communication | 2019 |
| Fixfly Ltd | Wholesale & retail | 2025 |
| Fixroy Partners Limited | Administrative & support | 2025 |
| Fixxedit Ltd | Construction | 2025 |
| Fizzah & Samia Limited | Wholesale & retail | 2006 |
| Fizzy Lead Limited | Professional & scientific | 2014 |
| FJ Couriers Limited | Administrative & support | 2025 |
| FK Florist Limited | Wholesale & retail | 2024 |
| FK Food 99P Limited | Wholesale & retail | 2025 |
| FK Global Ventures Ltd | Education | 2022 |
| Flag Promotions Ltd | Arts & recreation | 2010 |
| Flair Afro COS Ltd | Wholesale & retail | 2018 |
| Flair Limited | Administrative & support | 2008 |
| Flame & Fried Ltd | Hospitality | 2023 |
| Flame New Media Ltd | Information & communication | 2000 |
| Flame of Hope Ltd | Health & social care | 2019 |
| Flames and Smoke Ltd | Wholesale & retail | 2023 |
| Flaming Seoul Co. Limited | Hospitality | 2025 |
| Flamingo Swim School Ltd | Professional & scientific | 2021 |
| Flamoz Ltd | Hospitality | 2025 |
| Flare Phoenix Limited | Wholesale & retail | 2025 |
| Flash Dirty Club Limited | Wholesale & retail | 2021 |
| Flash Fittings Ltd | Other services | 2020 |
| Flashlight Private Investigations Ltd | Administrative & support | 2022 |
| Flat 46 Limited | Professional & scientific | 2023 |
| Flat Management (Mariners Way) Limited | Households | 1994 |
| Flavour Boss Ltd | Manufacturing | 2019 |
| Flavour Grill Limited | Hospitality | 2026 |
| Flavour on Fire Limited | Hospitality | 2026 |
| Flavours of the East Limited | Hospitality | 2023 |
| Flavours Without Borders Limited | Hospitality | 2025 |
| Flawless Beauty Aesthetics Medical Ltd | Other services | 2018 |
| Fleekedbyfee Empire Limited | Other services | 2025 |
| Fleekedbyh Ltd | Other services | 2024 |
| Fleetline Coachworks Limited | Wholesale & retail | 1985 |
| Fleetwood Heir Hunting Services Ltd | Other services | 2013 |
| Fleetwood School Management Company Limited | Households | 2002 |
| Fleischer Property Group Ltd | Real estate | 2026 |
| Fleming Mead Management Company Limited | Households | 1985 |
| Flemmings Business Advisors Limited | Administrative & support | 2014 |
| Flemmings Financial Planning Limited | Financial services | 2012 |
| Flex Detailing Ltd | Wholesale & retail | 2020 |
| Flex Interlink Limited | Administrative & support | 2002 |
| Flexair Technologies Ltd | Manufacturing | 2025 |
| Flexcisst Technology UK Limited | Wholesale & retail | 2024 |
| Flexiamber Ltd | Wholesale & retail | 2026 |
| Flexistay Ltd | Hospitality | 2010 |
| Flexistay Management Services Ltd | Households | 2010 |
| Flexrage Ltd | Wholesale & retail | 2020 |
| Flextro Ltd | Transport & logistics | 2024 |
| Flexywork AI Ltd | Information & communication | 2025 |
| Flight Lounge Group Limited | Hospitality | 2022 |
| Flight Wiser Limited | Administrative & support | 2025 |
| FLO Collective Limited | Professional & scientific | 2026 |
| Flomahx Ltd | Wholesale & retail | 2020 |
| Flomech Solutions Ltd | Construction | 2025 |
| Floor Sheen Limited | Administrative & support | 2021 |
| Floors YOU Like Ltd | Construction | 2018 |
| Floraam Limited | Wholesale & retail | 2026 |
| Floral Place Residents Company Limited | Households | 2025 |
| Floras Care Services Ltd | Health & social care | 2022 |
| Floraville Enterprises UK Limited | Real estate | 2019 |
| Florence 11 Ltd | Hospitality | 2025 |
| Florence Close Residents Management Company Limited | Households | 2024 |
| Florence Park Court Limited | Households | 1973 |
| Flori Escapes Ltd | Hospitality | 2025 |
| Florian James Limited | Hospitality | 2019 |
| Floritees Limited | Hospitality | 2019 |
| Flottamax Solutions Ltd | Transport & logistics | 2025 |
| Flour Mill Management Limited | Households | 2006 |
| Flourish Global Consulting Ltd | Professional & scientific | 2004 |
| Flow Care Services Limited | Administrative & support | 2018 |
| Flow Essence Ltd | Health & social care | 2025 |