| Atozspice Ltd | Bishop Auckland | 2026 |
| ATP Catering Ltd | Burnley | 2019 |
| ATP Foods Ltd | Rushden | 2020 |
| ATR Public Services Ltd | Ilkeston | 2026 |
| ATR Surrey Ltd | Wallington | 2017 |
| Atra Foods Ltd | Mitcham | 2025 |
| Atra Ltd | Mitcham | 2016 |
| Atram Ltd | London | 2013 |
| Atree Limited | Southampton | 2021 |
| Atreus Corporation Limited | Manchester | 2025 |
| Atrfood Limited | Manchester | 2020 |
| Atri Belfast Ltd | Newtownabbey | 2025 |
| Atria Maison Properties Ltd | Sheffield | 2026 |
| Atrium Coffee Ltd | Stretford | 2023 |
| Atrium Dronfield Ltd | Dronfield | 2018 |
| Atrium Hotel Limited | Feltham | 2017 |
| Atrium Park Developments Limited | London | 2004 |
| Atrium Restaurant Brigg Ltd | Brigg | 2025 |
| Atrium Student Accommodation Ltd | Edinburgh | 2022 |
| Atriumbar Ltd | Shifnal | 2026 |
| Atrivium Ltd | London | 2025 |
| Atropos Bars Ltd | Sheffield | 2023 |
| Atroposaurus Bar Ltd | Sheffield | 2023 |
| Atrose Ltd | Helensburgh | 2025 |
| Atrucafe Ltd | Ruislip | 2024 |
| ATS Bristol Limited | Bristol | 2019 |
| ATS GB Food Ltd | London | 2020 |
| ATS Holidays Ltd | Dalkeith | 2021 |
| ATS Hospitality Limited | Uxbridge | 2026 |
| ATS Pubs Ltd | Redditch | 2025 |
| ATS Ventures Limited | Blackpool | 2007 |
| Atsaa Family Ltd | Lincolnshire | 2024 |
| Atseventysix Limited | Southampton | 2021 |
| Atsh Ltd | London | 2025 |
| Atsi Enterprises Limited | Sandy | 2021 |
| Atsm Paisley Ltd | Paisley | 2026 |
| Atsus NI Limited | Belfast | 2019 |
| ATT (Paisley) Ltd | Kirkintilloch | 2026 |
| ATT Catering Limited | London | 2006 |
| ATT Companies Ltd | Liverpool | 2025 |
| ATT Cumnock Ltd | Cumnock | 2025 |
| ATT Food Ltd | Barnsley | 2019 |
| ATT Property Investments Group Ltd | Pontypool | 2025 |
| Atta Catering Ltd | Aberdeen | 2024 |
| Atta Food Ltd | Sheffield | 2025 |
| Atta Restaurants Ltd | Edinburgh | 2021 |
| Atta-Gul Holdings Limited | Birmingham | 2023 |
| Attaboy Ltd | Falkirk | 2022 |
| Attack the Snack Ltd | Leicester | 2026 |
| ATTACKING8BALL Ltd | Southampton | 2026 |
| Attap Limited | Long Melford | 1994 |
| Attendant Capital House Limited | London | 2023 |
| Attendant Clerkenwell Limited | London | 2023 |
| Attendant Fitzrovia Limited | London | 2023 |
| Attendant Mayfair Limited | London | 2023 |
| Attendant Norton Folgate Limited | London | 2023 |
| Attendant Shoreditch Limited | London | 2023 |
| Attendant Victoria Limited | London | 2024 |
| Attentive Management Ltd | London | 2023 |
| Attentive Security Ltd | Ilford | 2020 |
| Attermire Limited | Settle | 2026 |
| Attermyre Limited | Liverpool | 2003 |
| Atthebar Ltd | Rossendale | 2025 |
| Attic in the Town Ltd | Edinburgh | 2017 |
| ATTIC38 Ltd | Oadby | 2019 |
| Attica Catering Ltd | Waltham Cross | 2019 |
| Attica Greek Ltd | Dunfermline | 2022 |
| Atticus & Indi Coffee Ltd | Altrincham | 2025 |
| Atticus Cafe Bar & Grill Ltd | Cardiff | 2019 |
| Atticus Industries Ltd | Haslemere | 2018 |
| Attila the Pubs Ltd | Wimborne | 2026 |
| Attilas Group Ltd | Nottingham | 2024 |
| Attimore Properties Ltd | Hatfield | 2024 |
| Attimot Ltd | Windermere | 2022 |
| Attis Zeus Ltd | Luton | 2020 |
| Attleborough Kebab Limited | Enfield | 2026 |
| Attleborough Snooker Centre Limited | Attleborough | 2014 |
| Attleborough Town Social Club C.I.C. | Attleborough | 2025 |
| Attley's Collective Ltd | Sheffield | 2025 |
| Attlock PUB Co Ltd | Nottingham | 2021 |
| Attock Buffet Ltd | Birmingham | 2026 |
| Attock Restaurant Ltd | Keighley | 2024 |
| Attock Roti Junction Ltd | Birmingham | 2022 |
| Attock Sweet Centre Ltd | Bradford | 2016 |
| Attokyo Ltd | Birmingham | 2025 |
| Attolo Limited | Aberdeen | 2016 |
| Attosh Limited | Hatfield | 2023 |
| Attr Group Limited | London | 2022 |
| Attwood Hotels Limited | Dorset | 2002 |
| Atuin.Events Ltd | Rotherham | 2023 |
| Atulit.Frankies Ltd | Barnsley | 2025 |
| Atush Ltd | London, | 2025 |
| Atwal Investments Limited | Gravesend | 2009 |
| Atwal (Midlands) Limited | Birmingham | 2018 |
| Atwal Caterers Ltd | West Bromwich | 2020 |
| Atwal Chip Shop Long Riding Ltd | Basildon | 2015 |
| Atwal Chip Shop Ltd | Basildon | 2014 |
| Atwal Ditton Investments 2 Limited | Gravesend | 2024 |
| Atwal Ditton Investments Limited | Gravesend | 2019 |
| Atwal Investments 2 Limited | Chatham | 2026 |