Amkor Technology, one of the world’s largest outsourced chip assembly and testing firms, is weighing a sale of a stake in its China operations, a deal that could value the unit at between $1bn and $1.5bn, according to Bloomberg. Even so, the fact that Amkor has hired an adviser suggests the idea is being taken seriously. For a company whose factories are among the most strategically sensitive links in the chain, the logic is only sharper. Set against a possible $1bn-plus exit from China, the direction of travel is hard to miss. For now, Amkor is doing what a growing number of Western technology companies are doing, which is to hedge.