又有多家出手，“限购”

Group 1 - The core viewpoint of the article highlights that multiple North Exchange 50 index funds have recently announced restrictions on large purchases to protect the interests of fund shareholders and ensure stable fund operations [1][5][6] - The North Exchange 50 index has shown impressive performance this year, leading to significant gains in related theme funds, with an average net value growth rate exceeding 42% for 11 North Exchange theme funds as of May 28 [7][9] - Several fund companies, including Tianhong, Zhongou, and Industrial Bank of China, have implemented purchase limits, with specific daily purchase caps ranging from 3,000 yuan to 50,000 yuan [2][5][8] Group 2 - As of the end of the first quarter, the Tianhong North Exchange 50 index fund had a scale of 355 million yuan, with a year-to-date net value growth rate of nearly 30% [3] - The North Exchange's overall market capitalization is relatively small, and a large influx of funds could lead to liquidity pressure, prompting the current purchase restrictions [6] - The introduction of new regulatory measures and a focus on small-cap stocks have contributed to the increased activity and performance of related funds, with some funds achieving net value growth rates as high as 66.90% [9][10]