- 3m - Pressurized Polyurethane Foam Adhesives Business Acquired By Innovative Chemical Products Group
- 3M Acquisitions
- 3M - Electronic Monitoring Business Acquired By Apax Partners
- 3M - North American Library Systems Business Acquired By Bibliotheca AG
- 3M - Safety Prescription Eyewear Business Acquired By HOYA Optical Laboratories
- 3M - Taper Dry Powder Inhaler Acquired By Adamis Pharmaceuticals
- 3mensio Medical Imaging BV Acquired By Pie Medical Imaging BV
- 3MG Media Acquisitions
- 3P Air freighters Acquisitions
- 3P Equity Partners
- 3PAR Acquired By HP
- 3Phoenix Acquired By Ultra Electronics Holdings
- 3Pillar Global Acquisitions
- 3PL Central Acquisitions
- 3Point Machining Acquired By Shipston Group
- 3point Science Acquired By ARANZ Geo
- 3Q Digital Acquired By Harte-Hanks
- 3R Products & Services Acquired By Installed Building Products
- 3rd Planet Techies Acquisitions
- 3ree Pte Acquired By WPP
- 3S Engineering Acquired By Sierra Nevada
- 3S Group Acquired By Ekkio Capital
- 3SBio Acquisitions
- 3scale Acquired By Red Hat
- 3SI Security Systems Acquired By LLR Partners
- 3T Software Labs Acquired By Red Gate Software
- 3Tera Acquired By CA
- 3ti Solutions Acquired By Mirum
- 3TIER Acquired By Vaisala Oyj
- 3TS Capital Partners
- 3united Mobile Solutions AG Acquired By VeriSign
- 3V SourceOne Capital
- 3V Transport A/S Acquired By DSV Miljø A/S
- 3vis Technologies Acquired By Scalar Decisions
- 3Way Networks Acquired By Airvana
- 4 AM Midstream Acquisitions
- 4 G s Truck Renting Acquired By Ryder System
- 4 West Holdings Acquisitions
- 4-Antibody AG Acquired By Agenus
- 4-Front Research Acquired By Intertek Group
