三变科技今日涨3.49%，有3家机构专用席位净卖出1.21亿元

Group 1 - The stock of Sanbian Technology increased by 3.49% today, indicating positive market sentiment towards the company [1] - The trading volume reached 2.237 billion yuan, reflecting significant investor interest [1] - The turnover rate was 34.17%, suggesting a high level of trading activity relative to the total shares outstanding [1] Group 2 - One institutional special seat net bought 793,100 yuan, indicating some institutional confidence in the stock [1] - Three institutional special seats net sold 12.1 million yuan, which may suggest some caution or profit-taking among other institutional investors [1]