Core Viewpoint - Starting from 2026, the adjustment frequency of the Russell US Index will change from once a year to twice a year to better reflect market conditions and valuations [1][6]. Group 1: Adjustment Process - The Russell US Index consists of the Russell 1000, Russell 2000, and Russell 3000 indices. The Russell 1000 includes the largest 1,000 companies by market capitalization, representing 93% of the total investable US stock market, while the Russell 2000 includes the smallest 2,000 companies [3]. - The adjustment process will occur in three phases: the confirmation of index constituents based on market capitalization after the market close on April 30, followed by transitional months in May and June, with preliminary adjustment lists communicated to the market starting May 23 [3][2]. Group 2: Market Impact - The adjustments to the Russell US Index have significant implications for the market, as approximately $10.5 trillion tracks these indices, making adjustment days some of the highest trading volume days of the year [5]. - On the Nasdaq exchange, during the 2024 adjustment day, approximately 2.9 billion shares were traded in just 0.878 seconds, totaling $95.3 billion, setting a new historical record for Russell index rebalancing days [5].

Group 1 - FTSE Russell announced the annual reconstitution of the Russell US Index, with changes effective after the market close on June 27 [1] - A total of 36 companies will be added to the Russell 1000 Index, with 19 of these stocks coming from the Russell 2000 Index [1]