Methodology Update
AT50 Index — first post-launch methodology note and subscriber brief
The first post-launch methodology note for the AT50 Index is now available, including a public methodology summary and the quarterly review schedule.
AT50 Index — first post-launch methodology note and subscriber brief
February 2026 — Indexa Exchange Group has published the first post-launch methodology note for the AT50 Index.
Public Methodology Summary
A public summary of the AT50 Index Methodology (v4.0) is now available on the publications page. The summary covers eligibility criteria, pillar weights, review cadence, and data validation approach.
Institutional Documentation
Full institutional documentation — including the complete methodology charter, data dictionary, and back-test report — is available upon request to institutional subscribers.
Quarterly Review Schedule
| Quarter | Review Period | Publication Date |
|---|---|---|
| Q1 2026 | Jan–Mar 2026 | March 31, 2026 |
| Q2 2026 | Apr–Jun 2026 | June 30, 2026 |
| Q3 2026 | Jul–Sep 2026 | September 30, 2026 |
| Q4 2026 | Oct–Dec 2026 | December 31, 2026 |
Methodology Stability
No methodology changes have been enacted since launch. The Governance Council has noted several items under observation, which may result in refinements in subsequent quarters. Any methodology changes will be announced with a minimum 30-day notice period.