Communications services company WPP is investing $25...

Communications services company WPP is investing $25 million in ad tech provider AppNexus, it said in a Monday news release (http://bit.ly/1C5YoXv). The investment includes its ad server platform, WPP said, and “continues WPP’s strategy of investing in fast-growing sectors such as ad technology and programmatic media buying.” The company said the “AppNexus’ platform allows real time buying and selling of digital advertising for marketers, publishers and content providers and media investment management companies."