| Exrat Property Limited | Hospitality | 2014 |
| Exsolis Limited | Construction | 2023 |
| Ext.Int. Ltd | Construction | 2021 |
| Extension Specialize Ltd | Construction | 2019 |
| Exterior Cleaning Solutions Northampton Limited | Administrative & support | 2025 |
| Extra Resource Limited | Information & communication | 1999 |
| Extran Medica Limited | Transport & logistics | 1998 |
| Extraordinary Editions Limited | Wholesale & retail | 2010 |
| Extreme Clean Northants Ltd | Administrative & support | 2023 |
| Extreme Dryline Ltd | Construction | 2022 |
| Extreme Tooling Ltd | Wholesale & retail | 2021 |
| EXZ Ltd | Construction | 2026 |
| EYB Property Ltd | Real estate | 2022 |
| EYE 4 Roofing Ltd | Construction | 2025 |
| EYE in the Sky NN Ltd | Information & communication | 2026 |
| Eyedrate Clinic Ltd | Health & social care | 2025 |
| Eyelab Limited | Health & social care | 1983 |
| Eymen Berat Ltd | Other services | 2018 |
| Eytbridges Properties Ltd | Real estate | 2020 |
| EZ Collections Limited | Wholesale & retail | 2024 |
| EZ Computing Ltd | Information & communication | 2006 |
| Ezeeit Ltd | Information & communication | 2025 |
| Ezekers Ltd | Real estate | 2021 |
| Ezekerz Ltd | Wholesale & retail | 2023 |
| Ezekiel Thomason Property Investments Limited | Real estate | 2022 |
| EZO Bromley Limited | Hospitality | 2016 |
| Ezone Hub Limited | Wholesale & retail | 2024 |
| Ezsim.Club Ltd | Information & communication | 2025 |
| EZY Cars Limited | Transport & logistics | 2021 |
| F & B Construction Limited | Construction | 2010 |
| F & J Alsop Limited | Hospitality | 2021 |
| F & M Industrial Limited | Professional & scientific | 2011 |
| F & T Goodwin Limited | Construction | 2001 |
| F & T Recovery Services Limited | Manufacturing | 2012 |
| F E Foods Ltd | Hospitality | 2019 |
| F G Watts Financial Advisers Limited | Financial services | 2009 |
| F I Enforcement Ltd | Administrative & support | 2017 |
| F Japajapa Ltd | Health & social care | 2015 |
| F P Roofing Services Limited | Construction | 2009 |
| F Rahman Travel Limited | Transport & logistics | 2024 |
| F Raul Ltd | Construction | 2025 |
| F Tyme F Limited | Construction | 2013 |
| F&A Construction Ltd | Construction | 2021 |
| F&C RO Ltd | Construction | 2026 |
| F&I Groundwork Limited | Construction | 2015 |
| F&M Property Group Ltd | Real estate | 2025 |
| F&S Engineering Consultants Limited | Construction | 2021 |
| F. Mitton and SON (Electrical) Limited | Construction | 1986 |
| F.A.Bird,(Downham Mills),Limited | Professional & scientific | 1960 |
| F.Alti Enterprises Limited | Information & communication | 2022 |
| F.H. Management Company Ltd. | Households | 1992 |
| F.J.E. Contractors Limited | Construction | 2006 |
| F.L.Caswell Limited | Financial services | 1950 |
| F.S. Parfums Limited | Wholesale & retail | 2023 |
| F.V. Retain Walls Ltd | Manufacturing | 2025 |
| F.W.T. Burrows and Company Limited | Construction | 1969 |
| F1 HCW Ltd | Other services | 2013 |
| F12 Management Ltd | Administrative & support | 2021 |
| F6 Consulting Ltd | Information & communication | 2011 |
| F7M Global Ltd | Information & communication | 2026 |
| F9 Automotive Ltd | Wholesale & retail | 2025 |
| FA Logistics Ltd | Transport & logistics | 2021 |
| Faani & Satti Group Limited | Hospitality | 2026 |
| Faanoos 2 Limited | Hospitality | 2009 |
| Faban Ltd | Professional & scientific | 2020 |
| Fabian Transport Ltd | Transport & logistics | 2017 |
| Fabian&Eric Company Limited | Wholesale & retail | 2020 |
| Fabin Industries Limited | Manufacturing | 2026 |
| Fabio Rainbows Ltd | Construction | 2025 |
| Fabled Framing Ltd | Wholesale & retail | 2026 |
| Fabricks Limited | Extraterritorial | 2017 |
| Fabrikasa Ltd | Real estate | 2025 |
| Facades Deluxe Ltd | Construction | 2019 |
| Facel Vega Limited | Manufacturing | 2021 |
| Facilitating Excellence Limited | Professional & scientific | 1989 |
| Facilities Optimised Solutions Limited | Professional & scientific | 2023 |
| Fact Solutions UK Ltd | Professional & scientific | 2013 |
| Faction Apparel LP | | 2015 |
| Factor 4 Homes Limited | Construction | 2012 |
| Faesthetix Ltd | Other services | 2025 |
| Fahima London Limited | Wholesale & retail | 2013 |
| Fair Plumbing and Heating Ltd | Construction | 2024 |
| Fair Trade Club Ltd | Construction | 2026 |
| Fairclause Ltd | Information & communication | 2025 |
| Fairdene Road Limited | Construction | 2019 |
| Fairfax Farm Ltd | Agriculture & fishing | 2020 |
| Fairfield Fibre Ltd | Information & communication | 2019 |
| Fairfields (Stony Stratford) Management Company Limited | Households | 2015 |
| Fairline Homes (CR) Ltd | Construction | 2014 |
| Fairline Homes (Dover) Ltd | Construction | 2026 |
| Fairline Homes (Flore) Ltd | Construction | 2019 |
| Fairline Homes (PN) Ltd | Construction | 2020 |
| Fairline Homes (STC) Ltd | Construction | 2026 |
| Fairline Homes Construction Ltd | Construction | 2026 |
| Fairline Homes Holdings Ltd | Financial services | 2025 |
| Fairline Homes Limited | Construction | 2023 |
| Fairstone Homes Ltd | Construction | 2015 |
| Fairway Lawn and Gardens Limited | Administrative & support | 2023 |
| Faith IG Limited | Health & social care | 2021 |
| Faith-Shine Limited | Health & social care | 2023 |