- Arisa Assurances SA Acquired By DARAG Group Limited
- Arisa SA Acquired By Nidec
- Ariscom Compagnia di Assicurazioni Acquired By Argo Group International Holdings
- Arise Virtual Solutions Acquisitions
- ArisGlobal Acquisitions
- Arismore SAS Acquired By Accenture
- Arison Insurance Services Acquired By Assured Neace Lukens
- Arison Investments Mergers and Acquisitions
- ARISTA Consulting Group Acquired By Alera Group
- Arista Energy Acquired By TriStar Oil & Gas
- Arista Laboratories Acquired By Montrose Environmental Group
- Arista Networks Acquisitions
- Aristech Surfaces Acquired By Trinseo
- Aristocraft Supply Acquired By Americlean Holdings
- Aristocrat - Bonus Spin Technology & Table Signage Acquired By American Gaming Systems
- Aristocrat Lotteries AB Acquired By Playtech
- Aristocrat Technologies Australia Pty Acquisitions
- Ariston Global Acquisitions
- Ariston Thermo Acquisitions
- Aristos Logic Acquired By Adaptec
- Aritas Group Acquired By Portware
- Aritco Group AB Acquired By Credelity Capital AB
- Aritex Cading S.A. Acquired By AVIC International
- Aritzia Acquisitions
- Arium Acquired By Verisk Analytics
- ARIUS Research Acquired By Roche Holding AG
- Arius Software Acquired By Doxim
- Ariva Hospitality Pte Acquired By Rowsley
- Arivia S.A. Acquired By Upfield Europe BV
- Arixa Pharmaceuticals Acquired By Pfizer
- Arizant Acquired By 3M Company
- Arizona Advanced Dermatology Acquired By ADCS Clinics
- Arizona AFO Acquired By The Orthotic Group
- Arizona Bank & Trust Acquisitions
- Arizona Brake & Clutch Supply Acquired By TruckPro
- Arizona Chemical Acquisitions
- Arizona Counseling & Treatment Services Acquired By Sinfonia HealthCare
- Arizona Dermatopathology Acquired By Aurora Diagnostics
- Arizona Desert Shocks Acquired By Holley
- Arizona Eastern Railway Acquired By Genesee & Wyoming
