SK Hynix Inc.’s stock climbed 7% on Friday to a record after the company announced it had completed development of HBM4, the next generation of high-bandwidth memory crucial for artificial intelligence work.The Seoul-traded chipmaker, whose shares are up more than 90% over the past year, is now worth about $170 billion. The company’s stock was on an eight-day winning streak ahead of the announcement, as bullish AI sentiment lifted key supply chain players. SK Hynix is the go-to HBM provider for ...