- Atlas Copco Tools Central Europe GmbH
- Atlassian
- Atradius
- ATTRAQT
- Atuna
- Atuna Media
- AUDIENS CONSEIL
- AUGER AUTOTECHNIK GmbH
- AUMUND Holding B.V.
- Aurora Technology
- Autarco
- Authentiek
- Avalon Travel
- Avaloq Evolution AG
- Avaloq Sourcing (Europe) AG
- Avaya
- Avazu GMBH
- Avec B.V.
- Avertim
- Avery Dennison
- AVL List GmbH
- Avocado Wardrobe
- Avy BV
- Axiom Software Solutions
- Ayold
- Azarius (ARI Logistics)
- Azavista
- B Futurist B.V.
- B-612
- B-612 UK Ltd.
- B-aparthotel Kennedy
- BA Systemes
- Babel
- Babel Profiles
- Babysits
- Backbase
- BAEX Securities
- Baker Hughes a GE company
- Baker Hughes B.V.
- Bakers and Roasters
- Baltic Ground Services
- Balzer GmbH
- BAM Bouw en Vastgoed
- BAM Infra Nederland B.V.
- BAM International
- Bamigo