美股中概股盘前涨跌互现，纳比特涨7%

Group 1 - Chinese concept stocks in the US showed mixed performance before the market opened on September 2, with notable gains and losses among various companies [1] - Nabitt experienced a significant increase of 7%, indicating strong investor interest [1] - NIO and Alibaba both saw a rise of 2%, while NetEase increased by 0.6%, reflecting positive market sentiment towards these companies [1] Group 2 - Ctrip declined by 0.7%, suggesting potential concerns or profit-taking among investors [1] - JD.com, Xpeng Motors, and Baidu all fell by 1%, indicating a broader trend of weakness in certain Chinese tech stocks [1]