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- ASVA: Association of Scottish Visitor Attractions 1
- AT Digital 1
- At Oliver & Co 1
- AT&S Austria Technologie & Systemtechnik AG 1
- AT&S Austria Technologie & Systemtechnik AG 8
- AT&S Austria Technologie & Systemtechnik AG 1
- ATA North 1
- ATA Recruitment 42
- ATA Sameday Ltd 1
- Ataccama 1
- Atarim Summit 2
- Atelier Ten 4
- Athona Ltd 93
- Athos Commerce 1
- ATK Solutions 2
- AtkinsRéalis 18
- Atlas Copco Holding GmbH 5
- Atlas Green Limited 1
- Atlas Technica LLC 3
- Atlas Workplace Services 1
- Atlasica Ltd 1
- Atlassian 10
- Atom bank 5
- Atomic Weapons Establishment 11
- Atomicmedia 1
- Atominvest 1
- Atominvest Software Ltd 2
- Atos SE 12
- Atria Watford 1
- Atrium Workforce Solutions UK Limited 2
- ATS Automation Tooling Systems Inc 2
- Atsgas 4
- Attivo Group 1
- ATTOLLO SOLUTIONS LTD 2
- Attwaters Solicitors LLP 4
- AuB Talent 1
- Audiosupport 1
- AuditBoard 3
- Aura Projects Bvba 1
- Aurecon Group 2
- AurigaVision AG 2
- Auriol Resource 1
- Auror 1
- Aurora Energy Research Limited 11
- Aurora Lifesciences 1
- Austen Lloyd Ltd. 18
- Austin Bright 3
- Austin Rose Associates 1
- AustralianSuper Pty 4
- Autocab GPC Computer Software Ltd 1
- Autodesk, Inc. 3
- Autolus Limited 3
- Automata 1
- Automation 1
- Automobile Association 8
- Automotive Cells Company - ACC 1
- Automotive Recruitment Consultants Ltd 1
- Autoprotect (Mbi) Ltd 1
- Autoscan 1
- AutoSmart International Ltd 1