European entertainment company RTL Group (EBR: RTL) is set to purchase a 65 percent stake in Denver-based digital video advertising company SpotXchange Inc.

The deal, valued at $144 million, comes as more big-name buyers look to scoop up advertising companies that specialize in digital video content on mobile devices. Recently, Single Touch Systems Inc. (OTC BB: SINO) acquired ad targeting service Double Vision Networks for $4 million.

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