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- Arden Personnel 5
- Arden University 5
- Arden White 2
- Arden White Limited 3
- Ardencote 8
- ARDEX GmbH 2
- Ardian 1
- ARDIAN Investment UK Limited 1
- Ardmac 5
- Are The Fair Ltd 1
- Arena One GmbH 14
- Arena Racing Corporation Limited 14
- Ares Management Corporation 31
- Argee Ltd 1
- Argenbright Security Europe Limited (trading as ASEL) 8
- Argent Energy Limited 3
- Argenta 5
- Argyll and Isles Culture Heritage and Arts Assembly (CHARTS), have been awarded full Scottish Charit 3
- Aria Care 13
- ARIS company 1
- Aristocrat Leisure 2
- Arize AI, Inc 1
- Arjo Italia S.p.A. 2
- ARK ATWOOD PRIMARY ACADEMY 1
- ARK ELVIN ACADEMY 1
- ARK FRANKLIN PRIMARY ACADEMY 1
- Ark Housing Association Ltd 2
- ARK SOANE ACADEMY 2
- ARK TEACHER TRAINING 2
- ARK WHITE CITY PRIMARY ACADEMY 2
- Arkha 3
- Arkle Electronic Systems Ltd 1
- Arla Foods A.m.b.a 20
- Arlington Resource Management Ltd 3
- Arm Limited 8
- Armstrong Appointments 1
- Armstrong Fluid Technologies 1
- Armstrong Fluid Technology 2
- Armstrong Knight 1
- Armstrong Vets 10
- Armstrong Watson 8
- Armstrong Watson LLP 12
- Arne Clo Ltd 3
- Arnhemwharf 1
- Arnold Clark Group 26
- Arnold Hill & Co Llp 3
- Arondite 1
- Arora Group Head Office 4
- Around Noon Ltd. 2
- ARQ 4
- Arqfinance 1
- Arradistribution 1
- Arriva 5
- Arriva Cymru Limited 2
- Arriva Limited 6
- Arriva London North Limited 1
- Arriva Midlands Limited 1
- Arriva Rail London Ltd 10
- Arriva UK Bus Ltd 11
- Arriva-bf47d80e 4