| AMG Safety Associates Limited | Dumbarton | 2021 |
| AMG Traffic Management Ltd | Maghera | 2024 |
| AMH Wellness Ltd | South Croydon | 2024 |
| AMI23 Ltd | Bolton | 2023 |
| Amicale Healthcare Ltd | Coventry | 2020 |
| Amigos Community Care Limited | Maidenhead | 2019 |
| Amir and Imran Enterprise Limited | Oldham | 2025 |
| Amisha Patel Consultancy Ltd | London | 2020 |
| AMJ Loves Security Ltd | London | 2025 |
| Amjs Consultancy Ltd | Nottingham | 2025 |
| AMK RX Ltd | Northolt | 2022 |
| Amlt Care Regulations Ltd | Manchester | 2023 |
| Amoah Limited | London | 2019 |
| Amolab Services Limited | Gravesend | 2018 |
| Amour Healthcare Ltd | Swindon | 2023 |
| AMP Fire Ltd | Leicester | 2017 |
| Amparar Limited | Stanford-Le-Hope | 2019 |
| Amphira Limited | London | 2011 |
| Ampocc Solutions Limited | Dartford | 2016 |
| AMR Fire Risk Assessments Ltd | Hartlepool | 2025 |
| AMR Traffic Management Limited | Cardiff | 2018 |
| AMRCONSULTANCY9 Limited | Motherwell | 2025 |
| Amreen Ayub Limited | Middlesbrough | 2022 |
| Amro Amasha Limited | Birmingham | 2024 |
| AMS Safety Services Ltd | Huntingdon | 2019 |
| Amster Care Company Ltd | Crawley | 2024 |
| AMT Facades Ltd | Wakefield | 2024 |
| Amtc Care Ltd | London | 2020 |
| Amtt Interpreting Ltd | Birmingham | 2010 |
| AMX Fire Protection Ltd | Glasgow | 2026 |
| AMY Cairns Limited | Spennymoor | 2025 |
| AN Fire Services Limited | London | 2020 |
| An-Nasr & Al-Kahf Solutions Ltd | Manchester | 2023 |
| Analysis International Limited | Taunton | 2011 |
| Anambra State Union London Ltd | London | 2024 |
| Anamil Limited | Workington | 2019 |
| Anamon 1010 Ltd | London | 2025 |
| Anas Pharma Ltd | Manchester | 2024 |
| Anasa Care Limited | Bolton | 2024 |
| Anasarai Limited | Newton Abbot | 2024 |
| Anchor Care Ltd | London | 2025 |
| Anchor Care Services Ltd | Coventry | 2023 |
| Anchor Consulting Ltd | Corby | 2025 |
| Anchor Housing and Support Limited | Walsall | 2018 |
| Anchorage Care Solutions Ltd | Bolton | 2025 |
| Anchors Healthcare Services Ltd | Ipswich | 2020 |
| Anchorstead Therapy Limited | Mansfield | 2026 |
| Ancosec Limited | London | 1998 |
| AND Meta Limited | London | 2025 |
| Anders Psychological Therapies Ltd | Leyland | 2026 |
| Anderson Consulting & Research Limited | Brecon | 2000 |
| Anderson Fire Consultancy Ltd | Dumfries | 2022 |
| Anderson Safety & Engineering Services Limited | East Yorkshire | 2004 |
| Anderson's Law Limited | Reading | 2021 |
| Andersonaby Care Ltd | London | 2023 |
| Anderson’S Home Services Ltd | Leven | 2025 |
| Andikan Healthcare Services Limited | Luton | 2025 |
| Andlily Care Ltd | Leeds | 2022 |
| Andreea Vesey (Baciu) Ltd | Bexley | 2024 |
| Andrew Colson Training & Safeguarding Services Ltd | Bromsgrove | 2025 |
| Andrew D Webb Ltd | Selby | 2018 |
| Andrusida Care Limited | Coventry | 2022 |
| Anduks Ltd | Wolverhampton | 2023 |
| Anduril Industries UK Ltd. | London | 2019 |
| Andy Blake Defence & Security Ltd | Lincoln | 2025 |
| Andy Care and Counselling Limited | Taunton | 2025 |
| Andy Thurman Ltd | Warks | 2005 |
| Andyglobal BI Limited | Southampton | 2026 |
| Anew Approach Community Interest Company | Hyde | 2015 |
| Angel CV Ltd | London | 2023 |
| Angel F.P Limited | Oldham | 2012 |
| Angel Fire Services Limited | Oldham | 2023 |
| Angel Keruv Ltd | Nottingham | 2024 |
| Angel Tribes Quality Healthcare Solutions Limited | Grays | 2025 |
| Angela Ward Ltd | Coatbridge | 2021 |
| Angelay V Care Limited | Hatfield | 2025 |
| Angelic Assist Ltd | Bedworth | 2024 |
| Angelic Network Community Interest Company | Woking | 2020 |
| Angelics Consult UK Ltd | Dagenham | 2019 |
| Angelkay Ltd | Bristol | 2019 |
| Angels Outreach Community Interest Company | Leicester | 2023 |
| Angels-Dwell Care Services Ltd | Leeds | 2023 |
| Angels-Touch Care Ltd | Rushden | 2022 |
| Angelzlyt Ltd | Margate | 2025 |
| Angleshades Consulting Ltd | Bedford | 2010 |
| Anglo Alliance Limited | Birmingham | 2009 |
| Anglo Fire Suppression Limited | Manchester | 2018 |
| Anglo Home Care Services Ltd | Bristol | 2021 |
| Anglo Supported Living Services Limited | Bristol | 2020 |
| Anhony John E Limited | London | 2023 |
| Anicham Ltd | Mitcham | 2025 |
| Anikeak Limited | London | 2023 |
| Aniky Rose Ltd | London | 2018 |
| Animal Welfare Investigations Project Limited | London | 2021 |
| Anitamaradesa Limited | Westcliff-On-Sea | 2025 |
| Anjgycare Limited | London | 2023 |
| Anjou Campbell Ltd | Orpington | 2023 |
| Ankh-A Ltd | Harrow | 2022 |
| ANN Healthcare Services Ltd. | London | 2021 |
| Anna Bielecki Solutions Limited | Tadworth | 2017 |