Medical imaging technology company Polarean Imaging said chairman Richard Morgan and non-executive director Robert Bertoldi had both stood down, with immediate effect.
Sustainable fuels technology company Velocys said it had appointed Australian company Worley to manage the delivery of its fully-integrated technology package.
Watchstone said Canadian unit Quindell Services had received final change of control consent to sell subsidiary PT Healthcare Solutions to LM Holdings.
Investment manager River and Mercantile said its first-half assets under management rose 6.2%, boosted by positive investment performance and fresh fund inflows.