| A Pint of Hops Ltd | Wholesale & retail | 2018 |
| A Pirvulescu Ltd | Professional & scientific | 2016 |
| A Place 4U Guru Ltd | Real estate | 2023 |
| A Place Apart (Oxford) Limited | Financial services | 2023 |
| A Place Apart Holdings Limited | Financial services | 2014 |
| A Place Apart Limited | Hospitality | 2020 |
| A Place for Wine Ltd | Wholesale & retail | 2026 |
| A Place in London Ltd | Construction | 2014 |
| A Plaice for Lost Soles Ltd | Hospitality | 2025 |
| A Plan B Limited | Administrative & support | 2017 |
| A Plastic Free Planet UK Limited | Professional & scientific | 2019 |
| A Plus Building Contractors Ltd | Construction | 2024 |
| A Plus Catering Supplies Ltd | Wholesale & retail | 2025 |
| A Plus CH Consulting Ltd | Financial services | 2025 |
| A Plus Cloud Ltd | Information & communication | 2011 |
| A Plus Construction London Ltd | Construction | 2019 |
| A Plus Construction Ltd | Construction | 2017 |
| A Plus Consulting Ltd | Professional & scientific | 2013 |
| A Plus Dental Limited | Health & social care | 2024 |
| A Plus Developments Group Ltd | Real estate | 2025 |
| A Plus E Consultancy Ltd | Professional & scientific | 2021 |
| A Plus Electrical Services Ltd | Construction | 2024 |
| A Plus Fit Ltd | Arts & recreation | 2020 |
| A Plus for Information Technology Ltd | Information & communication | 2023 |
| A Plus FUN Limited | Education | 2014 |
| A Plus Healthcare Services Ltd | Health & social care | 2012 |
| A Plus K Architecture Ltd | Professional & scientific | 2025 |
| A Plus London Ltd | Professional & scientific | 2025 |
| A Plus Management Limited | Health & social care | 2003 |
| A Plus Massage Limited | Other services | 2025 |
| A Plus Medical Group Ltd | Manufacturing | 2024 |
| A Plus N Ltd | Real estate | 2021 |
| A Plus Network Ltd | Construction | 2025 |
| A Plus One Limited | Other services | 2014 |
| A Plus Payment Solutions Ltd | Financial services | 2019 |
| A Plus Properties Limited | Construction | 2022 |
| A Plus Property London Ltd | Real estate | 2021 |
| A Plus Solutions Ltd | Wholesale & retail | 2020 |
| A Plus Ventures 01 LLP | | 2025 |
| A Plus Ventures 02 LLP | | 2025 |
| A Plus Web Tutors Limited | Education | 2021 |
| A PMR Art Studio Ltd | Information & communication | 2025 |
| A Pocket Full of Posies Ltd | Wholesale & retail | 2025 |
| A Podcast Called ETI SEN Ltd | Information & communication | 2020 |
| A Polished Production Limited | Information & communication | 2012 |
| A Polite Solution Limited | Administrative & support | 2010 |
| A Portuguese Love Affair Distribution Limited | Wholesale & retail | 2015 |
| A Portuguese Love Affair Limited | Wholesale & retail | 2015 |
| A Practice for Everyday Life Limited | Professional & scientific | 2010 |
| A Prime Van Ltd | Construction | 2023 |
| A Priori Films Ltd | Information & communication | 2010 |
| A Priori Projects Ltd | Professional & scientific | 2024 |
| A Pro Laboratory Design and Consultancy Ltd | Construction | 2025 |
| A Problem Solved Ltd | Administrative & support | 2020 |
| A Product Studio Limited | Information & communication | 2026 |
| A Profound Waste of Time Limited | Information & communication | 2016 |
| A Prompt Ltd | Information & communication | 2000 |
| A Prop Ltd | Construction | 2022 |
| A Proper Place Limited | Hospitality | 2025 |
| A Property Group Limited | Real estate | 2020 |
| A Property Management Block Company (NO.2) Limited | Administrative & support | 2022 |
| A Property Management Block Company Limited | Households | 2023 |
| A Property PA Ltd | Information & communication | 2026 |
| A Property Shop Limited | Real estate | 2010 |
| A Q Butt Trading Company Ltd | Wholesale & retail | 2022 |
| A Quarter of Limited | Wholesale & retail | 2003 |
| A Quartic Ltd | Information & communication | 2024 |
| A Quest for Home Ltd | Arts & recreation | 2025 |
| A Quiet Space Ltd | Professional & scientific | 2021 |
| A Quote Constructors Ltd | Construction | 2024 |
| A R Accounts Ltd | Professional & scientific | 2026 |
| A R B Accountants Limited | Professional & scientific | 2009 |
| A R B Connect Ltd | Construction | 2018 |
| A R Cabing Limited | Transport & logistics | 2015 |
| A R Capital Group Limited | Financial services | 2021 |
| A R Developmentss Ltd | Construction | 2026 |
| A R E Factor Limited | Professional & scientific | 2009 |
| A R Essential OIL Limited | Manufacturing | 2025 |
| A R Evans Properties Limited | Real estate | 2017 |
| A R Exchange Limited | Financial services | 2012 |
| A R F Sweet Inspiration Limited | Wholesale & retail | 2013 |
| A R Freshers Limited | Hospitality | 2008 |
| A R G Property Investments Ltd | Real estate | 2017 |
| A R GAS Engineers Limited | Energy | 2017 |
| A R Gibbons Limited | Other services | 2009 |
| A R Hygiene Ltd | Health & social care | 2026 |
| A R K Consultants Ltd | Information & communication | 1998 |
| A R Land and Property Investments Ltd | Real estate | 2009 |
| A R Lettings Management Ltd | Real estate | 2013 |
| A R Locations Limited | Information & communication | 2007 |
| A R M Direct Limited | Professional & scientific | 1984 |
| A R Mosaheb Ltd | Wholesale & retail | 2015 |
| A R Mulla & Sons (Management Services) Limited | Real estate | 2002 |
| A R Properties Essex Limited | Real estate | 2024 |
| A R S Developments Limited | Construction | 2024 |
| A R Star Enterprise Limited | Transport & logistics | 2019 |
| A R Substance Misuse Limited | Health & social care | 2013 |
| A R T Bain Ltd | Health & social care | 2021 |
| A R Takeaway Limited | Hospitality | 2017 |
| A R Technology Limited | Extraterritorial | 1996 |