MSCI Set to Announce May 2026 Index Review on May 12

Event summary

  • MSCI will announce the results of its May 2026 Index Review on May 12, 2026.
  • Changes will take effect at the close of May 29, 2026.
  • The review covers MSCI Global Standard, Small Cap, Micro Cap, Value and Growth Indexes, Frontier Markets, US Equity Indexes, US REIT Index, and China A Onshore/All Shares Indexes.
  • Detailed rebalancing information will be available to clients post-announcement.

The big picture

MSCI’s semi-annual index review is a critical event for global asset managers, as it dictates benchmark composition for trillions in passive and active strategies. The review’s outcomes often trigger significant portfolio rebalancing, particularly in emerging markets and small-cap segments. With $1.8 trillion in assets benchmarked to MSCI indexes, even marginal changes can ripple through trading volumes and liquidity.

What we're watching

Rebalancing Impact
How the additions and deletions will affect passive fund flows and active manager positioning.
China Exposure
Whether adjustments to China A Onshore/All Shares Indexes reflect shifting market access dynamics.
Regulatory Scrutiny
The pace at which index providers face governance challenges over methodology transparency.