The pharmaceutical company, which is developing treatments for disorders including neuropathic pain and Crohn's Disease, is backed by investors including AbbVie.

The offering will value the corporate-backed incubator and venture fund at approximately $6.45bn.

Cox Media made its third investment in the marketing company, which has also acquired video content platform Vidaao.

Google and Nokia are both exiting from the image advertising network, which had raised more than $28m, through an acquisition by Yahoo.

The e-commerce company is planning to launch the largest IPO ever, putting Yahoo in line to earn $8bn.

The exit is likely to have made a strong return for T-Venture, Deutsche Telekom's corporate venturing unit, which dubbed the company "a star performer" and the deal a "successful exit".

The Parkinson's disease drug developer has filed for an initial public offering the day after closing a $55m Alkermes-backed series C round.

The Google and Salesforce-backed sales and marketing software company has raised about $100m in venture funding so far.

Covagen, which is developing treatments for cancer and inflammatory diseases, has been acquired for an undisclosed sum, granting exits to Novartis and Seroba Kernel.