Euronext keeps AEX family composition unchanged in September 2026 review
Euronext is leaving the composition of its main Dutch equity index family unchanged after its September 2026 quarterly review. The decision covers the AEX, AMX, AMS Next 20 and AEX ESG, with the changes taking effect from Monday 21 September 2026 after implementation following the market close on Friday 18 September 2026.
Highlights
- Euronext's September 2026 quarterly review results confirm no changes to the AEX, AMX, AMS Next 20, and AEX ESG indices.
- The unchanged index composition will be effective from Monday 21 September 2026, with potential amendments only possible until Wednesday 16 September 2026.
- This decision means investors tracking the AEX family face no scheduled constituent adjustments for this quarterly cycle, maintaining stability in Dutch equity benchmarks.
September review timeline and scope
As announced by Euronext, the September 2026 quarterly review results show no changes to the composition of the AEX, AMX, AMS Next 20 and AEX ESG indices.The exchange says the review will be implemented after markets close on Friday 18 September 2026 and will become effective from Monday 21 September 2026.
Euronext also says the Independent Supervisor retains the right to amend the published selection until the final data is released after the close on Wednesday 16 September 2026, including in cases such as a removal linked to a takeover. Events taking place after that date do not trigger the replacement of any company that may have to be removed from the final index selection.
Implications for Dutch equity benchmarks
The unchanged outcome means investors tracking the AEX family face no scheduled constituent adjustments in this quarterly cycle, preserving the current composition of Euronext's main Dutch benchmark and related mid-cap, next-tier and ESG indices.Euronext reviews the AEX family every quarter, in March, June, September and December, while the full annual review takes place in March. The next Index Steering Committee review is scheduled for Tuesday 8 December 2026.
NSE’s revisions to the Nifty Fixed Income indices outlined an upcoming rebalancing of the Nifty Financial Services 3 to 6 Months Debt Index, effective 10 September 2026. The update added 20 short-term debt securities and removed 15 largely approaching maturity, keeping the index’s 3–6 month tenor profile while prompting portfolio and benchmark-tracking adjustments for index-linked strategies.
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