| Evelyn Fison Mews Management Company Limited | Households | 2007 |
| Evelyn Fison Roadway Management Company Limited | Households | 2007 |
| Ever Agile Limited | Professional & scientific | 2025 |
| Everyday Explorer Ltd | Wholesale & retail | 2021 |
| Evolution Darts Ltd | Wholesale & retail | 2020 |
| Evosolve | Education | 2000 |
| EVS (Electric Vehicle Solutions) Limited | Administrative & support | 2020 |
| Excel Heating Services Limited | Construction | 2020 |
| Excell Heating Limited | Construction | 2008 |
| Exel Heating Limited | Construction | 2012 |
| Experience Motorsport Ltd | Education | 2021 |
| Expert Labels Ltd | Administrative & support | 1999 |
| EYE Handyman Limited | Wholesale & retail | 2013 |
| F G Brown & Associates Limited | Health & social care | 2000 |
| F1 Properties Ltd | Real estate | 2019 |
| F3 Ventures Limited | Professional & scientific | 2005 |
| Fabrok Limited | | 1993 |
| Fair Deal Cars Limited | Wholesale & retail | 2002 |
| Families Together Suffolk | Health & social care | 2008 |
| Family Tree Garden and Property Maintenance Ltd | Administrative & support | 2025 |
| Farrington Building Services Ltd | Construction | 2014 |
| Fast Test Stowmarket LLP | | 2011 |
| Fast-Let Limited | Real estate | 2008 |
| Faye Francis Limited | Real estate | 2018 |
| FBB Solutions Limited | Financial services | 2021 |
| Felek Express Ltd | Wholesale & retail | 2025 |
| Felicita Properties Limited | Extraterritorial | 2024 |
| Fellbridge Building Services Limited | Construction | 2013 |
| Fellbridge Property Investments Limited | Real estate | 2021 |
| Fellbridge Property Limited | Financial services | 2021 |
| Fellingham Transport Services Limited | Transport & logistics | 2015 |
| Fentex Wholesale Ltd | Wholesale & retail | 2020 |
| Fenton Construction Ltd | Administrative & support | 2013 |
| FGP Enterprises Ltd | Wholesale & retail | 2019 |
| Fidra Property Ltd | Real estate | 2022 |
| Field Lifestyle Limited | Professional & scientific | 2018 |
| Field Notes Travel Guides Ltd | Information & communication | 2025 |
| Fieldens OTR Limited | Manufacturing | 2018 |
| FIG Tree Wills Ltd | Professional & scientific | 2025 |
| FILM4PIXEL Limited | Information & communication | 2023 |
| Finborough Fabrics Limited | Wholesale & retail | 2008 |
| Finborough Hall Services Limited | Construction | 1994 |
| Finbows (Bacton) 1991 Limited | Agriculture & fishing | 1990 |
| Finbows Holdings Limited | Financial services | 2025 |
| Finch (Elmswell) Limited | Construction | 2009 |
| Finn Water Treatment Ltd | Professional & scientific | 2021 |
| Fiona Mckenzie Limited | Professional & scientific | 2017 |
| Fire Stone Construction Ltd | Construction | 2022 |
| First Look Weddings LLP | | 2025 |
| Firstplanit Ltd | Information & communication | 2020 |
| Fitcore Europe (Foxglove) Ltd | Arts & recreation | 2025 |
| Fitrakis Enterprises Ltd | Real estate | 2020 |
| FJF Services Ltd | Real estate | 2021 |
| FJW Lettings Ltd | Real estate | 2026 |
| Flapjack Ltd | Professional & scientific | 2012 |
| Flaxley Hill Ltd | Professional & scientific | 2018 |
| Flaxmill Developments Ltd | Construction | 2020 |
| Flex SEC UK Ltd | Administrative & support | 2017 |
| Flickstar Limited | Administrative & support | 2023 |
| Flint UX Design Ltd | Information & communication | 2022 |
| Floor 2 Ceiling Carpentry Ltd | Construction | 2017 |
| Floor Dimensions Limited | Construction | 2007 |
| Florence Rose Productions Ltd | Arts & recreation | 2021 |
| Florenz Ltd | Real estate | 2026 |
| Folx Farm | Agriculture & fishing | 2015 |
| FOR the Bois CIC | Health & social care | 2024 |
| Fordham Consulting Services Limited | Information & communication | 2026 |
| Fordham Machines Ltd | Administrative & support | 2011 |
| Forecast Design Limited | Professional & scientific | 2011 |
| Forever Dental Limited | Health & social care | 2025 |
| Forix Limited | Wholesale & retail | 2004 |
| Forrest Farms Ltd | Agriculture & fishing | 2011 |
| Fortitude Martial Arts Ltd | Arts & recreation | 2024 |
| Foulger & Prime Autocare LP | | 2017 |
| Foundational Investment Limited | Information & communication | 2025 |
| Four Counties Driveways Limited | Construction | 2003 |
| Four Field Limited | Professional & scientific | 2014 |
| Fourteen Coffee Limited | Hospitality | 2026 |
| FOX Breaks Limited | Real estate | 2026 |
| Foxguard Limited | Information & communication | 2010 |
| Framlingham Livestock Association | Arts & recreation | 1990 |
| Frankie Davey Ltd | Information & communication | 2021 |
| Frankie IS a Nerd Ltd | Arts & recreation | 2018 |
| Frantec Limited | Other services | 2004 |
| Fred's Bar & Vinyl Limited | Wholesale & retail | 2024 |
| Freedom Motorcycle Tours Limited | Administrative & support | 2015 |
| Freightstore Limited | Transport & logistics | 1992 |
| Freightstore Warehousing Limited | Transport & logistics | 2017 |
| Frisenberg J. & Associates Ltd | Administrative & support | 2012 |
| Fritta Ltd | Hospitality | 2025 |
| Frontrunner Computer Services Limited | Information & communication | 2009 |
| Fulcrum Security Services Ltd | Administrative & support | 2019 |
| Fuyu Services and Consultancy Ltd | Information & communication | 2025 |
| G & E English Properties LLP | | 2022 |
| G & G Repairs Limited | Wholesale & retail | 2003 |
| G Cousin Ltd | Transport & logistics | 2018 |
| G L Fire Solutions Ltd | Construction | 2018 |
| G.D Bathrooms, Plumbing & Heating Limited | Construction | 2016 |
| G19 Engineering Limited | Professional & scientific | 2012 |
| Gaia Energy (Installations) Limited | Construction | 2024 |