| A P Smith Rigging Limited | Rotherham | 2019 |
| A P Systems & Solutions Ltd | Huddersfield | 1999 |
| A P Systems (Scotland) Ltd. | Buckie | 2013 |
| A P W Computer Services Limited | Lancashire | 1995 |
| A P Westbrook Limited | East Sussex | 1954 |
| A Page for YOU Ltd | Rochford | 2025 |
| A Painter Consulting Ltd | Sheffield | 2025 |
| A Parliament of Owls Ltd | Glasgow | 2023 |
| A Peagreen Company Limited | Winchester | 2001 |
| A Perfect Day's Editorial Ltd | London | 2016 |
| A Perfect Pocket Limited | Stanmore | 2013 |
| A Phone in the Hall Limited | London | 2021 |
| A Piece of Sarah Limited | London | 2026 |
| A Piece of the Party Limited | London | 2015 |
| A Place for Everyone CIC | Blyth | 2026 |
| A Plan & Design Ltd | Wednesbury | 2019 |
| A Pleasant Spot Limited | Manchester | 2011 |
| A Pluck Ltd | Eastbourne | 2025 |
| A Plus B Digital Consultant Ltd | Manchester | 2025 |
| A Plus Cloud Ltd | London | 2011 |
| A Plus for Information Technology Ltd | London | 2023 |
| A Plus JB Ltd | Fareham | 2016 |
| A Plus Tutors Ltd | Dunfermline | 2009 |
| A PMR Art Studio Ltd | London | 2025 |
| A Podcast Called ETI SEN Ltd | London | 2020 |
| A Poke in the EYE Films Limited | Reading | 2013 |
| A Polished Production Limited | London | 2012 |
| A Possible Space Ltd | Tunbridge Wells | 2018 |
| A Priori Films Ltd | London | 2010 |
| A Product of Malitsky Limited | Taunton | 2013 |
| A Product Studio Limited | London | 2026 |
| A Productions Limited | Bristol | 2000 |
| A Profound Waste of Time Limited | London | 2016 |
| A Prompt Ltd | London | 2000 |
| A Property PA Ltd | London | 2026 |
| A Q Productions Ltd | London Colney | 2022 |
| A Quartic Ltd | London | 2024 |
| A R D Production Ltd | Bridport | 2011 |
| A R Design and Development Limited | Castleford | 2015 |
| A R Hillman Ltd | Maldon | 2008 |
| A R Initiative Limited | Stevenage | 2010 |
| A R Jeffery Ltd | West Wickham | 2025 |
| A R K Consultants Ltd | London | 1998 |
| A R L Insurance Services Limited | Tamworth | 2004 |
| A R Locations Limited | London | 2007 |
| A R Networks Limited | Stockport | 2012 |
| A R Professional Services Limited | Croydon | 2012 |
| A R Project Solutions Limited | Crawley | 2009 |
| A R Unit Ltd | Dunmow | 2007 |
| A R Vision Limited | London | 2014 |
| A Rabbit's Foot Ltd | London | 2022 |
| A Real Place Limited | London | 2021 |
| A Remarkable Idea Limited | Mirfield | 2017 |
| A Reverie Limited | London | 2025 |
| A Rigby Contracting Ltd | Reading | 2018 |
| A Rigby Limited | Southsea | 2023 |
| A Riley Comms Limited | Huntingdon | 2017 |
| A Riozzi Telecommunications Limited | Darlington | 2018 |
| A Room With a View Productions Limited | Harrow | 1985 |
| A Rose Hermione Ltd | Mildenhall | 2025 |
| A Rosy Future Ltd | Danbury | 2014 |
| A Rowley Consultancy Limited | Newcastle Upon Tyne | 2025 |
| A Running Commentary Ltd | London | 2015 |
| A Running Commentary Productions Ltd | Stevenage | 2025 |
| A Running Stitch Film Limited | London | 2025 |
| A S a P Publishing Limited | Wimborne | 2000 |
| A S Broadcast Services Ltd | Hanworth | 2016 |
| A S Computer Systems Ltd | Wickford | 2016 |
| A S D Consultancy Ltd | Reading | 2007 |
| A S Gill Ltd | London | 2019 |
| A S Integration Ltd | Edgware | 2005 |
| A S Kelman Limited | Altrincham | 2009 |
| A S Manak Consultancy Ltd | Coventry | 2018 |
| A S Mcdonald Ltd | Enfield | 2023 |
| A S Teleconstruction Ltd | Hatfield | 2022 |
| A Sadiq Company Limited | Leeds | 2021 |
| A Save & Prosper Company Limited | Milton Keynes | 2012 |
| A Scott Films Ltd | London | 2025 |
| A Scott Productions Ltd | London | 2015 |
| A Seat at the Table Limited | Bristol | 2020 |
| A Select Production Limited | Hampshire | 1990 |
| A Service Books Ltd | London | 2025 |
| A SET DEC Affair Ltd | Richmond | 2011 |
| A Seyfried Limited | London | 2009 |
| A Ship Through Time Ltd | Chepstow | 2024 |
| A Siege of Herons Limited | Macclesfield | 2011 |
| A Simple Logic Ltd | London | 2018 |
| A Simple Process Limited | London | 2023 |
| A Simplicity Upload Ltd | London | 2025 |
| A Skilled Hines Limited | Northampton | 2013 |
| A Slice of the PIE Limited | Birmingham | 2009 |
| A Smart CV Ltd | Bury St. Edmunds | 2025 |
| A Social Pro Ltd | Llandrindod Wells | 2024 |
| A Soul Rebel Production Ltd | Poulton-Le-Fylde | 2024 |
| A Sourcing Edge Limited | Farnham | 2011 |
| A Spider's Web Studio Limited | Stroud | 2025 |
| A Splendid Time Productions Limited | Swanage | 2016 |
| A Spokes Accounting Limited | Whittington | 2019 |
| A Spring Forward Ltd | London | 2024 |
| A Spring Thing Limited | Airdrie | 2016 |