- 3Di Technologies Acquired By L3 Technologies
- 3DM Systems Acquired By GN Store Nord A/S
- 3DPlusMe Acquired By WhiteClouds
- 3DPrint.com Acquired By MecklerMedia
- 3DSIM Acquired By ANSYS
- 3Dsolve Acquired By Lockheed Martin
- 3DX Industries Acquisitions
- 3esi-Enersight Acquisitions
- 3Events Agency Acquired By MCI Group Holding SA
- 3F Chimica Acquired By Kemira Oyj
- 3F Therapeutics Acquisitions
- 3form Acquired By Hunter Douglas NV
- 3G Capital
- 3gamma AB Acquisitions
- 3GS Acquisitions
- 3H Technology Acquired By QinetiQ Group
- 3i Group Acquisitions
- 3i Infotech Acquired By ObjectWay
- 3i Infotech Acquisitions
- 3i Infrastructure
- 3i Private Equity
- 3i Supply Acquired By Distribution International
- 3i Systems Acquired By Kronos
- 3K Oil Services Acquired By Tervita
- 3M - Digital Signage Assets Acquired By LSI Industries
- 3M - Global Static Control Business Acquired By Desco Industries
- 3M - Identity Management Business Acquired By Gemalto NV
- 3m - Pressurized Polyurethane Foam Adhesives Business Acquired By Innovative Chemical Products Group
- 3M Acquisitions
- 3M - Noise Environmental and Heat Stress Monitoring Products Acquired By TSI
- 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
