| A Natural FIX Ltd | Wholesale & retail | 2022 |
| A Natural Wood Designs Ltd | Manufacturing | 2025 |
| A Neat Touch Studio Limited | Manufacturing | 2016 |
| A Neater Living Company Ltd | Households | 2018 |
| A Nelson & Co Limited | Manufacturing | 1930 |
| A Neta Ltd | Administrative & support | 2023 |
| A New Brand Limited | Wholesale & retail | 2020 |
| A New Day Interior Design Studio Limited | Professional & scientific | 2017 |
| A New Day Ltd | Information & communication | 2016 |
| A New Design Studio Limited | Professional & scientific | 2020 |
| A New Direction London Limited | Education | 2008 |
| A New Direction Ltd | Transport & logistics | 1997 |
| A New Journey Ltd | Wholesale & retail | 2025 |
| A New Kind Ltd | Professional & scientific | 2023 |
| A New Leaf Limited | Health & social care | 2015 |
| A New Leash for Life Rescue Ltd | Other services | 2026 |
| A New Level Limited | Professional & scientific | 2020 |
| A New Life Abroad International Ltd | Professional & scientific | 2003 |
| A New Life Abroad Limited | Real estate | 2002 |
| A New Look Barber Shop Ltd | Other services | 2025 |
| A New Narrative Limited | Professional & scientific | 2016 |
| A New Page Limited | Other services | 2025 |
| A New Place Ltd | Real estate | 2018 |
| A New View Ltd | Financial services | 2026 |
| A New Wave Ltd | Wholesale & retail | 2023 |
| A New YOU (Brighton) Limited | Health & social care | 2010 |
| A Newbeing Ltd | Wholesale & retail | 2025 |
| A Next Wave Media Ltd | Professional & scientific | 2025 |
| A Nice Cuppa TV Ltd | Arts & recreation | 2026 |
| A Nice Old Thing Ltd | Wholesale & retail | 2024 |
| A Nicewicz Construction UK Ltd | Construction | 2010 |
| A Night to Remember Events Ltd | Administrative & support | 2025 |
| A Nightingale Development Ltd | Real estate | 2025 |
| A Nightingale Ltd | Professional & scientific | 2024 |
| A Noble Dare Limited | Wholesale & retail | 2023 |
| A Noble Writer Ltd | Professional & scientific | 2018 |
| A Nomadic Abode Limited | Professional & scientific | 2017 |
| A Nomad’S Van Ltd | Manufacturing | 2025 |
| A Noodles Production Ltd | Information & communication | 2012 |
| A NOS Amours Ltd | Information & communication | 2013 |
| A Nudel Consultancy Ltd | Wholesale & retail | 2010 |
| A Number 10 Production Limited | Information & communication | 2018 |
| A Number Films Limited | Information & communication | 2006 |
| A O Abidjan Express Ltd | Wholesale & retail | 2019 |
| A O H Electrical Ltd | Construction | 2018 |
| A O Optics Limited | Health & social care | 2006 |
| A O Property Management Limited | Real estate | 2010 |
| A O Realty Estates Ltd | Real estate | 2025 |
| A OCH B Holding Limited | Extraterritorial | 2025 |
| A on the Road Limited | Other services | 2019 |
| A One Games UK Limited | Information & communication | 2023 |
| A One Hair Salon Limited | Other services | 2025 |
| A One Household Limited | Wholesale & retail | 2020 |
| A One Opinions Ltd | Professional & scientific | 2025 |
| A One Property Enterprises Ltd | Real estate | 2022 |
| A ONG Limited | Construction | 2012 |
| A Ormrod Limited | Health & social care | 2016 |
| A Osman Consultancy Ltd | Health & social care | 2026 |
| A P 108 Properties Ltd | Real estate | 2026 |
| A P Bellenger Ltd | Construction | 2026 |
| A P C Contractors Ltd | Construction | 2006 |
| A P Capital Investments Limited | Financial services | 2010 |
| A P Costumes Limited | Information & communication | 2016 |
| A P Desai Limited | Households | 2022 |
| A P Digital Solutions Ltd | Professional & scientific | 2024 |
| A P DRY Cleaners Limited | Professional & scientific | 2015 |
| A P Films Limited | Professional & scientific | 2023 |
| A P James Ltd | Professional & scientific | 2016 |
| A P M Electrics Ltd | Construction | 2019 |
| A P P Wholesale Limited | Wholesale & retail | 2008 |
| A P Planning Practice Ltd | Information & communication | 2013 |
| A P Property Projects Limited | Real estate | 2021 |
| A P Property Solutions Ltd | Real estate | 2010 |
| A P Rouse Holdings Limited | Financial services | 2020 |
| A P Urban Design Limited | Professional & scientific | 2026 |
| A PAN Property Ltd | Real estate | 2026 |
| A Park View Hotel (Wolverhampton) Ltd | Hospitality | 2020 |
| A Park View Hotel Limited | Hospitality | 2010 |
| A Parker Advisory Ltd | Professional & scientific | 2025 |
| A Parsons Decorating Ltd | Construction | 2022 |
| A Partner in Education | Education | 2009 |
| A Party in a Box Ltd | Wholesale & retail | 2025 |
| A Passion for Purpose Ltd | Other services | 2020 |
| A Passion FUR Pets Ltd | Other services | 2023 |
| A Pattern Cutter & Grader Limited | Manufacturing | 2019 |
| A PAY Services Ltd | Administrative & support | 2022 |
| A Pearce Limited | Professional & scientific | 2016 |
| A Perfect Day's Editorial Ltd | Information & communication | 2016 |
| A Perfect Finish UK Ltd | Construction | 2014 |
| A Perfect Fit Ltd | Manufacturing | 2017 |
| A Perfect JOB Limited | Health & social care | 2015 |
| A Perfect Nomad Ltd | Wholesale & retail | 2018 |
| A Perfect Plan Limited | Other services | 2025 |
| A Personal Property Solution Ltd | Professional & scientific | 2023 |
| A Phone in the Hall Limited | Information & communication | 2021 |
| A Piece of Ghana Ltd | Wholesale & retail | 2026 |
| A Piece of Sarah Limited | Information & communication | 2026 |
| A Piece of the Party Limited | Information & communication | 2015 |
| A Piller-Roner Limited | Professional & scientific | 2017 |
| A Pinch of Sugar Ltd | Hospitality | 2010 |