The Visa-backed UK-listed payments company buys US rival Clairmail in an all-share exchange, valuing Clairmail at $173m.

The healthcare research company backed by healthcare company Merck's corporate venturing unit does the deal after selling a majority stake to a buyout firm last year.

SAP and Time Warner-backed video advertising company buys rival.

Anaphore said it acquired RuiYi for an undisclosed amount to gain access to its biologics drug discovery platform targeting G protein coupled receptors (GPCRs).

OMGpop publishes Draw Something, which is the top game on social network Facebook.

The social communications company previously backed by International Data Group's corporate venturing unit seals the acquisition.

Symantec-backed consumer identity security company LifeLock acquires Investor Growth Capital-backed rival ID Analytics.

AOL Ventures-backed SalesCrunch made the offer, plus 15% equity in itself, for online meeting software company WebEx, which was bought by Cisco for $3.2bn. Cisco labelled the move "a cute publicity stunt".

The Walmart-backed bank holding company, which listed in 2010, acquires mobile app company Loopt.

Dealised sells off its UK operations and makes an Asian push, less than a year after receiving backing from SingTel's corporate venturing unit.