Nissan Motor Co shares surged as much as 20.6% after the announcement that Cayman Islands-registered ECM Master Fund, affiliated with activist investor Effissimo Capital Management, acquired a 2.5% stake in the company. This investment comes amid Nissan's recent struggles, including a decision to cut 9,000 jobs and reduce production capacity by 20%, leading to a significant drop in its stock price prior to the rally. The involvement of activist investors has sparked speculation regarding potential structural reforms at Nissan, which has been under pressure to improve corporate governance. Despite the positive market reaction, Nissan's shares had previously reached a four-year low following a drastic forecast cut of 70% in annual profits due to declining sales in key markets like China and the U.S. The company expressed appreciation for all shareholders and their belief in Nissan's future potential. The trend of shareholder activism has been gaining momentum in Japan, prompting companies to reassess their governance and operational strategies.