Shares of South Korean chipmaker SK Hynix plummeted on Thursday following Goldman Sachs' decision to downgrade the company's rating to "neutral" for the first time in over three years. The move, attributed to concerns that advancements by competitors could result in losses for SK Hynix, sent shockwaves through the market. After analyst Giuni Lee revised the rating from "buy," SK Hynix's share price experienced a steep decline of up to 8.8%, marking its largest drop since April 7. In stark contrast, shares of rival Samsung Electronics gained 2.3% during the same period.