The bankrupt saltwater electrolyte battery developer had raised $190m in financing from investors including Shell, Total and Exelon but was bought for less than $9.2m.

Twitter-backed music streaming service SoundCloud is reportedly in advanced talks to sell a majority stake to the two to alleviate financial struggles.

Dermatology product developer and JLabs graduate Sienna Biopharmaceuticals floated at the middle of its range having raised $86m in venture funding.

The e-commerce platform, backed by investors including SoftBank, Intel and Alibaba, has decided against a $950m sale and elected to instead restructure.

The American Express and Deloitte-backed cloud financial management software developer has agreed to an acquisition by enterprise software producer Sage.

E-commerce marketplace Flipkart has had a bid of between $900m and $950m accepted from the board of corporate-backed rival Snapdeal that now needs only shareholder approval.

Facebook has paid an undisclosed amount to buy Source3, an intellectual property management startup that had raised $4m from investors including Autodesk.

Living Pharma, an immunotherapy developer, has been acquired just 18 months after being spun out from University of Maryland.

Change.org has paid an undisclosed sum to acquire Versa, a media commentary platform that had raised $2m from backers including Qualcomm Ventures.