| A E Services MK Limited | Administrative & support | 2026 |
| A E Stanton Limited | Wholesale & retail | 2014 |
| A Easton Consulting Ltd | Construction | 2024 |
| A Education Hayes Limited | Education | 2023 |
| A Education Services Ltd | Education | 2020 |
| A Education Slough Limited | Education | 2025 |
| A Eleanor Ltd | Transport & logistics | 2024 |
| A Electric Solutions Limited | Construction | 2020 |
| A Elsworth Ltd | Construction | 2011 |
| A Energy Solutions Ltd | Construction | 2011 |
| A Environmental Ltd | Water & waste | 2023 |
| A Estate Limited | Real estate | 2022 |
| A Etcetera Ltd | Professional & scientific | 2022 |
| A Events London Ltd | Arts & recreation | 2017 |
| A Exclamation Ltd | Information & communication | 2022 |
| A F a Restaurants Limited | Hospitality | 2013 |
| A F Building Services Limited | Construction | 2005 |
| A F Ducas Surveyors Ltd | Professional & scientific | 2018 |
| A F Fitness Studio Ltd | Arts & recreation | 2020 |
| A F Hall Services Ltd | Administrative & support | 2021 |
| A F Hill Ltd | Professional & scientific | 2011 |
| A F London Limited | Real estate | 2006 |
| A F Mobile Ltd | Wholesale & retail | 2022 |
| A F Ring Consultancy Limited | Professional & scientific | 2018 |
| A F S Financial Management Limited | Financial services | 1981 |
| A F Smart Repairs Limited | Manufacturing | 2011 |
| A F Sullivan Ltd | Professional & scientific | 2026 |
| A F Thomas Ltd | Construction | 2026 |
| A F Weidi Limited | Other services | 2003 |
| A Facades Ltd | Construction | 2023 |
| A Fades Studio Ltd | Other services | 2023 |
| A Fahri Electrical Limited | Manufacturing | 2018 |
| A Fair Start Limited | Other services | 2026 |
| A Falcon Ltd | Wholesale & retail | 2023 |
| A Fallen Poete Limited | Wholesale & retail | 2025 |
| A Family Affair Ltd | Professional & scientific | 2025 |
| A Family Convenience Store UK Ltd | Wholesale & retail | 2018 |
| A Family Office Ltd | Professional & scientific | 2023 |
| A Fang Limited | Wholesale & retail | 2024 |
| A Farm 2024 Limited | Arts & recreation | 2024 |
| A Fashina Company Ltd | Health & social care | 2020 |
| A Fashion Day Ltd | Wholesale & retail | 2021 |
| A Fashion Story Ltd | Wholesale & retail | 2025 |
| A Fatuga Ltd | Professional & scientific | 2016 |
| A Fave Five Films Limited | Arts & recreation | 2020 |
| A FEW Good Productions Ltd | Information & communication | 2019 |
| A FEW Great MEN Ltd | Education | 2017 |
| A FEW Quid Ltd | Information & communication | 2025 |
| A FEW Words Press Ltd | Information & communication | 2014 |
| A FI YUH Property Management Ltd | Real estate | 2022 |
| A FIN Management UK LLP | | 2022 |
| A Finder Ltd | Wholesale & retail | 2020 |
| A Fine Friend Ltd | Professional & scientific | 2023 |
| A Fine Reflex Ltd | Professional & scientific | 2025 |
| A Fine Thing Indeed Limited | Hospitality | 2023 |
| A Firm Hand Ltd | Construction | 2025 |
| A Firm Tree Ltd | Wholesale & retail | 2024 |
| A Five Star Property Maintenance Ltd | Other services | 2022 |
| A Flair to Remember Events Ltd | Other services | 2019 |
| A Flooring Boutique Ltd | Other services | 2015 |
| A FLY on the Wall Ltd | Arts & recreation | 2025 |
| A Flying Chance Limited | Wholesale & retail | 2023 |
| A Foison Sauce Ltd | Manufacturing | 2024 |
| A Food and Wine Limited | Wholesale & retail | 2017 |
| A Food Researcher Ltd | Professional & scientific | 2026 |
| A for Left Ltd | Real estate | 2024 |
| A for OWL Ltd | Professional & scientific | 2021 |
| A Force London Limited | Manufacturing | 2020 |
| A Ford Roofing Limited | Construction | 2025 |
| A Foreign Country Limited | Information & communication | 2013 |
| A Forte for Ltd | Professional & scientific | 2025 |
| A Fortune International Ltd | Hospitality | 2021 |
| A Found Sound Limited | Information & communication | 2012 |
| A Frame Capital Limited | Other services | 2021 |
| A Frame Design Ltd | Professional & scientific | 2020 |
| A Freitas Intermediate Ltd | Wholesale & retail | 2025 |
| A French Group Ltd | Construction | 2025 |
| A Fresh Pair of Eyes Ltd | Professional & scientific | 2024 |
| A Frey Consultancy Ltd | Professional & scientific | 2025 |
| A Full English Limited | Arts & recreation | 2020 |
| A Fuller Life AI Ltd | Information & communication | 2026 |
| A Fuorvito & Sons Ice Cream Co Ltd | Hospitality | 2012 |
| A Future Investments Limited | Real estate | 2015 |
| A Future Without Rubbish CIC | Professional & scientific | 2020 |
| A G & G Limited | Administrative & support | 2000 |
| A G 27 Ltd | Hospitality | 2024 |
| A G Classic Car Hire Ltd | Wholesale & retail | 2025 |
| A G Clinical Sports Therapy Ltd | Health & social care | 2024 |
| A G Cribb Consultancy Ltd | Information & communication | 2013 |
| A G Finance Hub Ltd | Financial services | 2012 |
| A G Finance Limited | Financial services | 1985 |
| A G Global Opportunities Limited | Financial services | 2019 |
| A G Impex Ltd | Wholesale & retail | 2024 |
| A G Infinity Ltd | Wholesale & retail | 2018 |
| A G Mackinnon Consultancy Limited | Professional & scientific | 2023 |
| A G Major Ltd | Manufacturing | 2019 |
| A G Martin Designs Ltd | Professional & scientific | 2023 |
| A G Martin Properties Ltd | Real estate | 2025 |
| A G Plumbers Ltd | Wholesale & retail | 2019 |
| A G R Accounts Ltd | Professional & scientific | 2024 |