Communication market structures and their effect on delivering efficient and inclusive connectivity is of key interest to policy makers and regulators. This report discusses emerging competition trends in OECD broadband markets that are shaping market structures, covering both fixed and mobile networks. The increasing complementarity of fixed and wireless networks and the convergence of previously separate markets have led to new forms of communication market competition. While convergence has been acting as a driver for market consolidation, there is also increased scrutiny in merger review. Some OECD countries are discussing options to keep mobile communication markets open to new entrants in the context of merger reviews, while others have experienced a recent wave of entry. The report explores the role of horizontal and vertical mergers in communication markets, presents examples of entry in mobile communication markets, and discusses some of effects of entry and consolidation in OECD markets.