罗素美国指数，启动年度重组！

Group 1 - The core point of the article is that FTSE Russell has announced an annual restructuring of the Russell US Index, effective after the market close on June 27, with plans to increase the adjustment frequency from once a year to twice a year starting in 2026 [1][6]. Group 2 - The restructuring will occur in three phases, with the first phase confirming the constituents based on market capitalization after the close on April 30. May and June will serve as transition months, with preliminary adjustment lists communicated to the market starting May 23 and updates provided on May 30, June 6, June 13, and June 20 [3][5]. - The Russell US Index comprises the Russell 1000 Index, which includes the largest 1,000 companies by market capitalization, accounting for 93% of the total investable US equity market, and the Russell 2000 Index, which includes the smallest 2,000 companies [3][5]. - The adjustments to the index have significant market implications, as approximately $10.5 trillion tracks the Russell US-related indices, making the restructuring day one of the largest trading volume days in the US market [5]. Group 3 - The changes are intended to ensure that the Russell US Index remains representative of the market, as market conditions and valuations evolve over time [6]. - On the 2024 adjustment day, the Nasdaq's closing cross-match system executed approximately 2.9 billion shares valued at $95.3 billion in just 0.878 seconds, setting a new record for Russell index restructuring days [5].