Group 1 - Nanshan Aluminum International (600219) saw its stock price increase by over 13% during trading, reaching a new high of 69.4 HKD, with a cumulative increase of over 50% in the past month [1] - The company is a major alumina manufacturer in Southeast Asia, primarily producing metallurgical-grade alumina using the low-temperature Bayer process [1] - Nanshan Aluminum International is one of the top three alumina producers in Southeast Asia, with a design capacity of 2 million tons and holding a 34.9% market share in the region according to Frost & Sullivan [1] Group 2 - CICC's research report highlights three key stock selection criteria for the aluminum sector: high capacity-to-market value ratio, strong growth potential with overseas expansion capabilities, and prioritizing companies with high self-sufficiency in alumina amid current low alumina prices [1] - The report suggests that if there are production shutdowns, policy stimuli, or disruptions in Guinea's mining policies, companies with higher alumina self-sufficiency should be favored [1]