On Thursday, the Hang Seng Index declined by 76 points, or 0.3%, settling at 26,924, marking its first negative close in five sessions despite an optimistic start. This downturn was influenced by continuous slumps in mainland stocks for the third consecutive day, as markets braced for the release of significant data next week, including the fourth quarter GDP figures and December's activity indicators such as industrial production and retail sales. Risk aversion increased following sustained declines on Wall Street the previous day. Concurrently, Chinese regulators took the market by surprise by tightening margin requirements in an effort to restrain stock market activity, which had witnessed unprecedented surges in turnover and leveraged bets. The technology and consumer sectors led the losses in the city, overshadowing gains seen in the property and financial sectors. Trip.com tumbled 18.7% following an antitrust investigation by regulators, while Alibaba Hong Kong saw a 2.1% drop after enhancing its Qwen AI app for consumer use. Other significant decliners included Kuaishou Technology (-2.8%), Pop Mart International (-1.5%), and China Hongqiao Group (-1.3%).