Euronext keeps ISEQ 20 composition unchanged in September review
Euronext is leaving the composition of the ISEQ 20 and ISEQ 20 Capped unchanged following its September 2026 quarterly review. The revised index status takes effect from Monday 21 September after implementation at the close of trading on Friday 18 September 2026.
Highlights
- Euronext's September 2026 quarterly review confirms no changes to ISEQ 20 or ISEQ 20 Capped index composition.
- Index changes will be implemented after market close on 18 September 2026 and effective from 21 September 2026, pending any pre-cutoff amendments.
- Euronext maintains its quarterly ISEQ index reviews in March, June, September, and December, with full annual adjustments scheduled for March.
September review timeline and index outcome
Euronext says the September 2026 quarterly review results for the ISEQ 20 and ISEQ 20 Capped show no changes to either index's composition.The exchange operator states that the changes are implemented after markets close on 18 September 2026 and become effective from 21 September 2026. It 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 the event of a removal linked to a takeover.
After that cutoff, any later event does not trigger the replacement of a company removed from the final index selection.
Quarterly schedule for the ISEQ family
The review forms part of Euronext's regular oversight of the ISEQ family of indexes, which is carried out every quarter in March, June, September and December.Euronext says the full annual review of the ISEQ family takes place in March, giving market participants a fixed timetable for broader index adjustments.
Our earlier coverage of the Federal Energy Regulatory Commission’s September 10, 2026 meeting outlined a wide set of orders affecting U.S. power and gas markets, including tougher grid security standards, compliance directives for market rules, and approvals for transactions. We also noted pipeline certificates and new capacity authorizations that support additional firm gas transportation and infrastructure development, underscoring how regulators can influence investment timelines and operating requirements.
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