| Fincham Harper Ltd | Professional & scientific | 2016 |
| Find & Flourish Ltd | Professional & scientific | 2025 |
| Find Direct Ltd | Wholesale & retail | 2024 |
| Find HR Ltd | Information & communication | 2023 |
| Find My Trip Ltd | Administrative & support | 2024 |
| Find Services Ltd | Other services | 2024 |
| Find the Light Peterborough Limited | Health & social care | 2022 |
| Fine Choice Trading Ltd | Wholesale & retail | 2020 |
| Fine Food Cambs Ltd | Hospitality | 2026 |
| Fine Fragrance Company Limited | Manufacturing | 2025 |
| Fine House Properties Limited | Hospitality | 2021 |
| Fine Nights Ltd | Health & social care | 2025 |
| Fine Peak Ltd | Wholesale & retail | 2025 |
| Fine Traders Ltd | Wholesale & retail | 2023 |
| Fineshade Studios Ltd | Professional & scientific | 2022 |
| Finesse by Beni Ltd | Other services | 2024 |
| Fingenuity Limited | Professional & scientific | 2013 |
| Finish Line Delivery Ltd | Transport & logistics | 2018 |
| Finite Loop Solutions Ltd | Extraterritorial | 2021 |
| Finney Meadows (Shepshed) Residents Management Company Limited | Households | 2026 |
| Finreg Consultants Ltd | Professional & scientific | 2015 |
| Fins Care Limited | Other services | 2014 |
| Finss Ltd | Wholesale & retail | 2025 |
| Finsys Consultancy Ltd | Professional & scientific | 2011 |
| Fintray Farms Limited | Agriculture & fishing | 2010 |
| Fire and Electrical Compliance Ltd | Construction | 2018 |
| Fire and Smoke Catering Limited | Hospitality | 2023 |
| Firecrest Black Ltd | Information & communication | 2025 |
| Fired Hearth Limited | Wholesale & retail | 2016 |
| Firefli Solutions Ltd | Information & communication | 2018 |
| Firesupport Limited | Wholesale & retail | 2003 |
| Firetree Chocolate Limited | Manufacturing | 2023 |
| Firewire Electrical Ltd | Construction | 2017 |
| Firework Shop Peterborough Ltd | Wholesale & retail | 2025 |
| Firmin Lang Limited | Real estate | 2017 |
| Firmyear Property Management Limited | Households | 1991 |
| First Accident Claims Centre Limited | Administrative & support | 2009 |
| First Active Health and Leisure Limited | Health & social care | 2013 |
| First Car Choice Ltd | Wholesale & retail | 2021 |
| First Choice Betta Cars Ltd | Transport & logistics | 2021 |
| First Class Consultancy Services Limited | Administrative & support | 2022 |
| First Class Records Ltd | Manufacturing | 2024 |
| First FIX Fasteners Ltd. | Construction | 2015 |
| First Hamblin (Eastern) Limited | Information & communication | 1976 |
| First Investment (Cambs) Ltd | Administrative & support | 2017 |
| First Lady Prestige Athletics Ltd | Wholesale & retail | 2025 |
| First Look Legal Ltd | Professional & scientific | 2025 |
| First Solar Vision Ltd | Manufacturing | 2017 |
| First Step Residential Ltd | Health & social care | 2026 |
| First Touch Soccer (E.M.) Limited | Arts & recreation | 1999 |
| Firstland Estates Limited | Arts & recreation | 2003 |
| Fishtastic Limited | Hospitality | 2011 |
| Fishtastic Peterborough Limited | Hospitality | 2020 |
| Fitness Karma Ltd | Wholesale & retail | 2021 |
| Fittora Limited | Wholesale & retail | 2025 |
| Fitz Type Ltd | Administrative & support | 2018 |
| Fitzgerald's BED Centre Limited | Professional & scientific | 2005 |
| Fitzjohn Properties Limited | Real estate | 2018 |
| Fitzwilliam Finance Limited | Real estate | 2014 |
| Fitzwilliam Land Company (the) | Agriculture & fishing | 1968 |
| Five Bees Property Limited | Real estate | 2026 |
| Five Counties Cleaning Limited | Administrative & support | 2014 |
| Five Counties Logistics Ltd | Transport & logistics | 2024 |
| Five Rivers Asset Management Ltd | Real estate | 2026 |
| Five Rivers Capital Partners Ltd | Financial services | 2026 |
| Five Rivers Therapy Ltd | Health & social care | 2003 |
| Five Stone Property Investment Limited | Households | 2025 |
| Fivev Construction Ltd | Construction | 2022 |
| FIX Estate Agents Ltd | Real estate | 2025 |
| FIX First Heating Ltd | Construction | 2020 |
| FIX My Tech (Millfield) Ltd | Wholesale & retail | 2024 |
| Fixatech Limited | Extraterritorial | 2019 |
| Fixc Lettings Ltd | Real estate | 2026 |
| Fixc Maintenance Ltd | Construction | 2026 |
| Fixfee Limited | Professional & scientific | 2020 |
| Fixmyvehicle Limited | Wholesale & retail | 2026 |
| Fizzcon Ltd | Information & communication | 2025 |
| Fizzyweb Ltd | Information & communication | 2005 |
| FJ Property Investments Limited | Real estate | 2019 |
| FJL Consultancy Ltd | Information & communication | 2024 |
| FK Locum Limited | Health & social care | 2025 |
| Fkkuk Ltd | Wholesale & retail | 2025 |
| FL Truck Ltd | Administrative & support | 2017 |
| FL61 Ltd | Hospitality | 2020 |
| Flag Cars Ltd | Wholesale & retail | 2025 |
| Flagship Tattoo Ltd | Arts & recreation | 2021 |
| Flagship Trucks Ltd | Professional & scientific | 2018 |
| Flame Bidco Limited | Financial services | 2026 |
| Flame Topco Limited | Financial services | 2026 |
| Flamingo Invest Properties Ltd | Real estate | 2017 |
| Flavours of Blizz Limited | Hospitality | 2024 |
| Flaying KHU Ltd | Wholesale & retail | 2025 |
| Fleet GPS (Peterborough) Ltd | Professional & scientific | 2025 |
| Fleet Services Direct Limited | Wholesale & retail | 2014 |
| Fleet-Safe UK Ltd | Wholesale & retail | 2024 |
| Fleet-Serv EBT Limited | Professional & scientific | 2023 |
| Fleet-Serv Holdings Limited | Financial services | 2023 |
| Fleetdoc Ltd | Wholesale & retail | 2021 |
| Fleetscout Limited | Wholesale & retail | 2026 |
| Fleetway House II Ltd | Wholesale & retail | 2026 |