- Armstrong Hi-fi & Video Service Ltd - London
- Armstrong Security London - London
- Armstrong Simmonds Architects Ltd - London
- Arnold Hill & Co LLP - London
- Art Bronze Foundry Ltd - London
- Art In Site - London
- Art Print Studio - London
- Artemide GB Ltd - London
- Arthur Beale Ltd - London
- Arthur Brett & Sons Ltd - London
- Arti Promotions - London
- Artic Building Services Ltd - London
- Arup - London
- AS Supplies Ltd - London
- ASA Distribution - London
- Asbestech Ltd - London
- Ashdown Control Services Ltd - London
- Ashford Environmental Services Ltd - London
- Ashley Stewart Ltd - London
- Ashmount Flooring Supplies Ltd - London
- Ashworths Solicitors - London
- ASL Locksmith - London
- Aspar Pharmaceutical Ltd - London
- Aspect Corporate Clothing Ltd - London
- Aspermont - London
- Asprey London - London
- Assemblyroom Ltd - London
- Assertive Media - London
- Asset Consulting Engineers - London
- Assist Inventories - London
- Assist Security Ltd - London
- Associated British Port Ipswich - London
- Associated Pipework - London
- Associated Security Group Ltd - London
- Association for Consultancy and Engineering - London
- Association for Standards & Practices in Electronic Trade (t/a E Centre) - London
- Association of British Healthcare Industries - London
- Association of Commonwealth Universities - London
- Association of Consulting Actuaries - London
- Assured GRC - London
- Astadia - London
- ASTEL UK LTD - London
- Aston Communications - London
- Aston Matthews Ltd - London
- Astoria Fire and Security - London
- Astounding Interiors - London
- Astute Technologies - London
- AT On Line Computing Ltd - London
- Atelier 41 Architects - London
- Aterre Ltd - London
Companies 301 to 350
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