Thomson Reuters stock rises on inclusion in Nasdaq-100 Index

Thomson Reuters (TRI) will be added to the prestigious Nasdaq-100 Index and several related technology-focused indices, replacing ANSYS (ANSS), effective prior to market open on Monday, July 28, 2025. This announcement led to a 0.5% premarket stock increase for TRI, as inclusion in major indices typically enhances investor visibility and drives higher trading volumes due to mandatory purchases by index-tracking funds and ETFs.

Analysis

Thomson Reuters (TRI) is set to join the Nasdaq-100 Index and several associated technology-focused indices on July 28, 2025, a development that prompted an immediate 0.5% premarket stock increase. This inclusion is a significant technical catalyst, as it will compel passive index-tracking funds and ETFs to purchase TRI shares to align their holdings with the new index composition. The move, which displaces ANSYS, Inc. (ANSS), enhances TRI's visibility among institutional investors and is expected to generate sustained buying demand. While the market reaction was immediately positive, the long lead time of over a year until the effective date provides a substantial period for the market to price in these future capital flows. Consequently, the primary impact is a long-term structural tailwind for TRI, contrasted with a corresponding structural headwind for ANSS, which will face mandatory selling pressure from the same passive funds.

Key Decisions for Investors

• Investors should view the inclusion of Thomson Reuters in the Nasdaq-100 as a long-term positive technical driver, anticipating gradual buying pressure from index funds leading up to the July 2025 effective date.
• Holders of ANSYS, Inc. should be aware of the potential for sustained selling pressure as the removal date approaches, which could create a headwind for the stock's performance.
• The extended timeline until the index rebalancing may present a pairs trading opportunity, such as going long TRI and short ANSS, for investors looking to capitalize on the anticipated divergence caused by passive fund flows.