幸福蓝海今日20%涨停，3家机构专用席位净买入2875.24万元

Group 1 - The document lists various securities firms and their respective trading activities, indicating a mix of buying and selling actions by different members [1][1][1] - Notable buying activities are observed from institutional investors and specific securities firms, suggesting a potential interest in certain stocks [1][1][1] - Selling activities are primarily attributed to specific branches of securities firms, indicating a possible shift in investment strategy or portfolio rebalancing [1][1][1]