- AreaOne Acquired By Tremor International
- Areas España Acquired By Cerea Partenaire
- ArecaBay Acquired By Imperva
- Areet Kaila
- Arellia Acquired By Thycotic Software
- Arena Americas - Formerly Karl s Event Services Acquired By Arena Group
- Arena Capital Advisors LLC
- Arena Capital Partners Mergers and Acquisitions
- Arena Energy Acquired By Lime Rock Partners
- Arena Group Acquisitions
- Arena Italia Acquired By Capvis AG
- Arena Media Communications Espana SA Acquired By Havas SA
- Arena Media Networks Acquired By Access360
- Arena Minerals Acquisitions
- Arena One Acquired By BCM One
- Arena Pharmaceuticals Acquired By Pfizer
- Arena Resources Acquired By SandRidge Energy
- Arena Solutions Acquisitions
- Arena Strategic Advisors LLC
- Arena Technologies Acquired By Systems Planning & Analysis
- arenalingua Acquired By Learnlight Software S.L.
- Arendals Fossekompani ASA Acquisitions
- Arendt & Medernach SA
- Arens Control Acquired By Curtiss-Wright
- Arent Foch
- ArentFox Schiff LLP
- AREPA Danmark A/S Acquired By Envista Forensics
- Areport Acquired By Auditchain Labs AG
- ARES Outdoors Acquisitions
- Ares Private Equity Group Mergers and Acquisitions
- Ares Private Equity Group – EIF Mergers and Acquisitions
- ARES Project Management Acquisitions
- Ares Software Acquired By Adobe
- Aresia SA Acquisitions
- Aresia SA Acquisitions
- Arete Capital Partners Mergers and Acquisitions
- Arete Consulting Acquired By Euromoney Institutional Investor
- Arete Development Acquired By Glotel
- Arete Partners Acquired By Riviera Partners
- Arete Pharmacy Network Acquisitions
