MSCI's 73% Volume Surge Propels It to 140th in Trading Activity Amid Price Decline

On September 15, 2025, , . , ranking 140th in terms of trading activity among listed equities that day. The surge in volume suggests heightened investor activity despite the price decline.

Recent developments affecting MSCI include adjustments in its index methodology and regulatory scrutiny in emerging markets. A proposed revision to its ESG scoring framework has drawn mixed reactions from institutional investors, with some expressing concerns over potential dilution of criteria. Additionally, pending litigation in Southeast Asia related to index weighting practices has introduced short-term uncertainty for the firm.

Market participants are closely monitoring MSCI’s response to evolving regulatory expectations. . Analysts note that the company’s ability to balance stakeholder demands with index integrity will likely influence its valuation trajectory in the near term.

To ensure I design the test exactly the way you intend, could you please confirm a couple of details? First, which market should the “top-500” list be drawn from? Second, should each of the 500 names be held in equal weight from today’s close to tomorrow’s close, with full re-selection every trading day? Third, do you want to include transaction costs or treat the back-test as frictionless? Once these points are confirmed, I can proceed with data collection and execution.