Dick Costolo resigns from his position effective 1 July, while Jack Dorsey, co-founder of the micro-blogging platform, returns as interim CEO.
Avago, Charter Communications and Intel prove to be big spenders.
The $4.4 billion deal will advance Verizon's growth ambitions in mobile video and advertising.
Chuck Robbins replaces long-time company veteran John Chambers as CEO.
The US Department of Justice scuppers the $30 billion proposed merger of Tokyo Electron and Applied Materials.
The company decides to drop its $45.2 billion bid for Time Warner Cable.
The company makes a powerful move into the healthcare sector with the acquisitions of Explorys and Phytel.
The acquisition of O2 will see it merge with Three, Hutchison Whampoa's existing British carrier.
The company acquires Careerify, a Canadian start-up that will help automate the referrals process using big data.
The Chinese e-commerce giant's $200 million investment sees Snapchat's value increase to $15 billion.
Microsoft sues Kyocera over patent infringements regarding the latter's cellphones.
The company has been ordered to pay $532.9 million for the violation of three patents owned by Smartflash.