S&P Index Changes: Bentley Systems Joins MidCap 400, Western Union Joins SmallCap 600.

Bentley Systems will join the S&P MidCap 400, replacing Western Union. Western Union will join the S&P SmallCap 600, replacing Mr. Cooper Group, which was acquired by Rocket Companies. The changes will take place on October 6, 2025.

In a significant shift in the S&P MidCap 400 and SmallCap 600 indices, Bentley Systems Inc. (NASDAQ: BSY) will join the MidCap 400, replacing Western Union Co. (NYSE: WU), while Western Union will transition to the SmallCap 600, taking the place of Mr. Cooper Group Inc. (NASDAQ: COOP). These changes will take effect prior to the market open on October 6, 2025.

The reindexing is a result of the acquisition of Mr. Cooper Group by Rocket Companies Inc. (NYSE: RKT), which was completed on October 1, 2025. According to S&P Dow Jones Indices, Western Union’s market capitalization now better aligns with the small-cap market space, prompting its move from the mid-cap to the small-cap index Bentley Systems stock rises on S&P MidCap 400 inclusion^[1].

Bentley Systems, an Information Technology sector company, will benefit from increased visibility and potential buying from funds that track the MidCap 400 index. Western Union, classified in the Financials sector, will similarly gain from the SmallCap 600 index inclusion. Index inclusions often lead to positive stock movements due to increased visibility and potential fund buying Bentley Systems stock rises on S&P MidCap 400 inclusion^[1].

The changes highlight the dynamic nature of the stock market and the impact of corporate acquisitions and index rebalancing on stock performance. Investors should closely monitor the developments to understand how these shifts might affect their portfolios.