French advertising technology company Criteo raises $250.6m on Nasdaq after twice upping its IPO price and closing higher still.

Duke spin-out Aerie Pharmaceuticals sets its pre-IPO price range.

Pharmaceutical giant AstraZeneca writes $440m cheque for UCL spin-out Spirogen.

E-commerce company Shoprunner has reportedly raised more than $200m, as Alibaba joins its backers and eBay divests its stake.

Social networking service Twitter files IPO registration with a suggested valuation of $12.8bn.

Bluefin Robotics announces acquisition of Heriot-Watt University spin-out SeeByte.

Network software company Untangle acquires Intel-backed Cymphonix Corporation and pursues further acquisitions.