| First With Mortgages Limited | Financial services | 2003 |
| First York Limited | Transport & logistics | 1987 |
| FIRST4FOOTBALL Ltd | Education | 2025 |
| Firstasset Limited | Real estate | 2000 |
| Firstcentric Limited | Extraterritorial | 2000 |
| Firstframe Academy Ltd | Information & communication | 2025 |
| Firstframe Productions Ltd | Information & communication | 2015 |
| Firstgate Developments Ltd | Real estate | 2021 |
| Firstindex.Energy Limited | Construction | 2018 |
| Firstlight Limited | Real estate | 2019 |
| Firstserve Holdings Limited | Financial services | 2006 |
| Firth Flooring Ltd | Construction | 2015 |
| Firth Parish Limited | Professional & scientific | 1991 |
| Firth Sheet Metal Engineers Limited | Wholesale & retail | 1993 |
| Fiscal Engineers Limited | Financial services | 2000 |
| Fish & Chip Co (Yorkshire) Ltd | Hospitality | 2022 |
| Fish Bar Rothwell Limited | Hospitality | 2021 |
| Fish Dish Limited | Hospitality | 2025 |
| Fish Percolator Limited | Information & communication | 2015 |
| Fishbulb Firmware Limited | Information & communication | 2022 |
| Fisher (C&I) Limited | Professional & scientific | 1995 |
| Fisher Funerals Limited | Other services | 2017 |
| Fishermans Cottage Sandsend Ltd | Hospitality | 2020 |
| Fishers Plaice Ltd | Hospitality | 2021 |
| Fisken Ltd | Wholesale & retail | 2017 |
| Fit Brit Limited | Wholesale & retail | 2024 |
| Fit Cafe Ltd | Information & communication | 2015 |
| Fit for Every Game Consultancy Ltd | Arts & recreation | 2020 |
| Fit in Support Services Ltd | Administrative & support | 2024 |
| Fit the North Ltd | Construction | 2024 |
| Fit to Bust Limited | Wholesale & retail | 2002 |
| Fit to Thrive Coaching Ltd | Arts & recreation | 2021 |
| Fit to Thrive Wellbeing Ltd | Health & social care | 2025 |
| Fit-On Developments Limited | Real estate | 2025 |
| Fitflare Wellness Ltd | Arts & recreation | 2023 |
| Fitiq Ltd | Information & communication | 2024 |
| Fitjet Limited | | 1989 |
| Fitnaz Coaching Ltd | Arts & recreation | 2026 |
| Fitness and Physique Limited | Arts & recreation | 2001 |
| Fitness for Work Limited | Other services | 2025 |
| Fitness Fuel Ltd | Manufacturing | 2019 |
| Fitness Inc Leeds Ltd | Arts & recreation | 2022 |
| Fitt Brand Ltd | Other services | 2023 |
| Fitted Your Way Ltd | Manufacturing | 2019 |
| Fitting Essentials Ltd | Construction | 2025 |
| Fitz Supplies Ltd | Wholesale & retail | 2022 |
| Fitzgerald Estates Limited | Real estate | 2018 |
| Fitzpatrick Investments Ltd | Financial services | 2020 |
| Fitzrentals Limited | Administrative & support | 2025 |
| Five Alive Community and Leisure Complex Limited | Education | 2017 |
| Five Beacons Ltd | Wholesale & retail | 2021 |
| Five Create Ltd | Manufacturing | 2019 |
| Five Spring Data Ltd | Information & communication | 2025 |
| Five Star Automotive Limited | Wholesale & retail | 2008 |
| Five Star Burger Ltd | Hospitality | 2025 |
| Five Star Business Ltd | Administrative & support | 2025 |
| Five Star Express Ltd | Wholesale & retail | 2020 |
| Five Star Homecare Leeds Ltd | Health & social care | 2018 |
| Five Star Tyres Ltd | Wholesale & retail | 2022 |
| Five Stars Barber Hunslet Ltd | Other services | 2025 |
| Five Towns Park (2) Limited | Real estate | 2014 |
| Five Towns Park Limited | Real estate | 2014 |
| Five Towns Print & Design Ltd | Administrative & support | 2017 |
| FIVE7T Ltd | Information & communication | 2023 |
| Fives (Hamilton) Ltd | Arts & recreation | 2018 |
| Fives Leeds Ltd | Arts & recreation | 2025 |
| Fives Wigan Ltd | Arts & recreation | 2025 |
| FIX N Flow Heating and Plumbing Solutions Ltd | Construction | 2023 |
| FIX Pro Maintenance Ltd | Construction | 2024 |
| Fix-Your-Energy Ltd | Health & social care | 2025 |
| FIX2FLIP Limited | Real estate | 2026 |
| Fixerhub Ltd | Information & communication | 2019 |
| Fixitonthego Ltd | Manufacturing | 2024 |
| Fixo Group Limited | Administrative & support | 2026 |
| Fixt Asset Management Limited | Real estate | 2020 |
| Fixxit Limited | Construction | 2020 |
| FIZ Bubble Tea Limited | Wholesale & retail | 2022 |
| FJB Accounting Limited | Professional & scientific | 2017 |
| FJC Accountancy Limited | Financial services | 2020 |
| FJC Financial Planning Limited | Financial services | 2016 |
| FJG Consulting Ltd | Information & communication | 2009 |
| FK Hair Design Ltd | Administrative & support | 2011 |
| FK Legal Ltd | Professional & scientific | 2024 |
| FK Taxi Hire Ltd | Transport & logistics | 2025 |
| FKD Legal Interpreting & Translation Services Ltd | Professional & scientific | 2026 |
| FKP Car Rentals Ltd | Transport & logistics | 2023 |
| FL Property Investments Limited | Real estate | 2017 |
| Fladonick Construction Limited | Construction | 2025 |
| Flame Lily Health Ltd | Health & social care | 2024 |
| Flame Lock Fire Protection and Joinery Ltd | Construction | 2026 |
| Flame Ventures Ltd | Real estate | 2025 |
| Flamenco DE Leeds Ltd | Arts & recreation | 2018 |
| Flames Day and Night Ltd | Hospitality | 2026 |
| Flametree Limited | Households | 1982 |
| Flamin Aces Ltd | Hospitality | 2023 |
| Flamingo 1 Ltd | Hospitality | 2020 |
| Flan Digital Limited | Professional & scientific | 2024 |
| Flannery Building Services Ltd | Manufacturing | 2018 |
| Flannery Consulting Ltd | Professional & scientific | 2011 |
| Flapjacks Food Limited | Hospitality | 2018 |