Opera Software has completed its acquisition of AdColony, a West Los Angeles mobile video advertising platform that specializes in HD mobile video.

The $350 million sale is one of the largest in a year that has seen 25 tech company exits in deals totaling nearly $2 billion, according to Built in Los Angeles.

AdColony Chief Executive Will Kassoy will remain at the helm of the company’s day-to-day operations and will become Opera Mediaworks’ Chief Marketing Officer.

“Opera is a natural fit for us and helps us accelerate our vision to extend the reach of our TV-like experience to a global stage,” Kassoy said in a statement.

AdColony joins Oslo, Norway-based Opera’s international list of recent mobile ad company acquisitions, which includes AdMarvel, Mobile Theory, 4th Screen and Apprupt. AdColony’s offices will remain in Los Angeles.

Staff reporter Melissah Yang can be reached at [email protected]. Follow her on Twitter @MelissahYang for the latest in L.A. tech news.