- X-BODY Acquired By Juno Therapeutics
- X-Ceptor Therapeutics Acquired By Exelixis
- X-Chem Acquired By Clariant AG
- X-Hive Acquired By EMC
- X-L Engineering Acquired By Oberg Industries
- X-Line Acquired By TRC Companies
- X-Press Tool & Manufacturing Acquired By BlackHawk Industrial Distribution
- X-Prime S.A.S Acquired By J. Walter Thompson Company
- X-Rated Acquired By Davide Campari - Milano
- X-Ray Analytics Acquired By Blackboard
- X-Ray Industries Acquired By Applus Services Sa
- X-Ray Optical Systems Acquired By Hach Lange
- X-Rite Acquisitions
- X-spine Systems Acquired By Xtant Medical Holdings
- X-Trade Brokers Dom Maklerski SA Acquired By Enterprise Investors Sp. z o.o.
- X-treme Geek Acquired By VWR Education
- X-Y Tool & Die Acquisitions
- X-Zyme Acquired By Johnson Matthey Pharma Services
- X.L. America Acquisitions
- X15 Software Acquired By FireEye
- X2O Media Acquired By Stratacache
- X32 Healthcare Acquired By Team Health Holdings
- X3M International Acquired By Aker Solutions ASA
- X4 Solutions Acquired By Sandler Partners
- X5 Music Group AB Acquired By Warner Music Group
- X5 Solutions Acquisitions
- XA Secure Acquired By Hortonworks
- XA Systems Acquired By Compuware
- Xaap Finance SASU Acquisitions
- Xaar Acquisitions
- XACCT Technologies Acquired By Amdocs
- Xact Data Discovery Acquisitions
- Xacti Acquired By Advantage Partners
- XactiMed Acquired By MedAssets
- XACTIX Acquired By SPTS Technologies
- Xactly Acquisitions
- Xactware Solutions Acquired By Insurance Services Office
- xAd Acquisitions
- Xafinity Acquisitions
- Xaloy Extrusion Acquired By Nordson
