Euronext’s September 2025 quarterly review reveals stability in the BEL 20® and BEL® ESG indices, with selective updates to the BEL Mid® and BEL Small® indices, reflecting ongoing efforts to balance market relevance and stability.
Euronext has recently unveiled the results of its quarterly review for September 2025 concerning the BEL® Family indices, which include the BEL 20®, BEL Mid®, BEL Small®, and BEL® ESG. These updates will come into effect after markets close on Friday, the 19th of September, 2025, with the new index compositions officially kicking in from Monday, the 22nd.
Interestingly enough, the BEL 20® index will remain exactly the same this quarter—no changes at all. It’s part of a broader trend lately where significant modifications to the BEL 20® tend to happen less often during these quarterly reviews. On the flip side, the BEL Mid® index will see some updates: CMB.TECH will be added, and SIPEF will be removed. As for the BEL Small®, it will add QUESTFOR and GR-PRICAF, replacing BANQUP GROUP and WAREHOUSES ESTATES. Now, the BEL® ESG index isn’t changing this round either, and that’s mainly because the Independent Supervisor is still working on reviewing the methodology—considering some rule changes and consulting with market participants before they decide to move forward with any adjustments.
This quarterly review process forms part of Euronext’s pretty structured approach—cycling through these updates regularly so that the indices stay aligned with current market realities. The BEL® Family indices are reviewed four times a year—in March, June, September, and December. The review in March generally involves a deeper, more thorough assessment, almost like an annual check-up. Also, keep in mind that the next meeting of the Index Steering Committee is set for December 10, 2025.
Now, historically, the BEL 20® has seen fewer tweaks during these quarterly reviews. For example, there were no changes reported in either the June 2025 review or the updates from December 2024 and September 2024. Meanwhile, the BEL Mid® and BEL Small® indices are more active—often reflecting shifts in market cap or sector performance. For instance, in June 2025, BPost was excluded from the BEL Mid® index but got added to the BEL Small®, a small but telling example of the fluid nature of mid and small-cap stocks. Similarly, the BEL® ESG index is generally pretty stable, with adjustments being rare. The September 2025 decision to hold off on changes, pending a methodology review, fits right into this pattern of cautious, well-considered moves.
It’s also important to note that the Independent Supervisor has discretionary authority to make last-minute changes until the final data is published—especially in cases like takeovers or urgent corporate actions. That said, any events occurring after the cutoff date—set here as the 17th of September, 2025—won’t prompt an immediate index reconfiguration until the next scheduled review.
All in all, Euronext’s diligent monitoring and systematic quarterly updates help ensure that the BEL® indices remain accurate and trustworthy benchmarks. They are designed to capture significant shifts in the Belgian market—while maintaining stability that investors and market participants rely on. It’s pretty fascinating, right? The balance between responsiveness and stability keeps the indices relevant without being too volatile.
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Source: Noah Wire Services
Verification / Sources
- https://mondovisione.com/media-and-resources/news/euronext-announces-september-2025-quarterly-review-results-of-the-bel-family-in-2025910/ - Please view link - unable to able to access data
- https://www.euronext.com/en/about/media/euronext-press-releases/euronext-announces-june-2025-quarterly-review-results-belr - Euronext announced the results of the June 2025 quarterly review for the BEL® Family indices, effective from 23 June 2025. The BEL 20® index remained unchanged. In the BEL Mid® index, BPost was excluded. The BEL Small® index saw BPost's inclusion and Ekopak's exclusion. The BEL® ESG index also had no changes. The Independent Supervisor retains the right to change the published selection until the final data publication after 18 June 2025. The BEL® Family indices are reviewed quarterly, with the next review scheduled for 10 September 2025.
- https://www.euronext.com/en/about/media/euronext-press-releases/euronext-announces-march-2025-annual-review-results-belr - Euronext announced the results of the March 2025 annual review for the BEL® Family indices, effective from 24 March 2025. The BEL 20® index saw Montea's inclusion and Galapagos's exclusion. In the BEL Mid® index, Galapagos and Vastned were excluded. The BEL Small® index had Exmar and Vastned excluded. The BEL® ESG index included Montea and excluded Bekaert and Recticel. The Independent Supervisor retains the right to change the published selection until the final data publication after 19 March 2025. The BEL® Family indices are reviewed quarterly, with the next review scheduled for 11 June 2025.
- https://www.euronext.com/en/about/media/euronext-press-releases/euronext-announces-december-2024-quarterly-review-results-belr - Euronext announced the results of the December 2024 quarterly review for the BEL® Family indices, effective from 23 December 2024. The BEL 20® index remained unchanged. In the BEL Mid® index, CIE BOIS SAUVAGE was included. The BEL Small® index saw CIE BOIS SAUVAGE's inclusion and Fluxys Belgium D's exclusion. The BEL® ESG index included Aperam, Bekaert, and Recticel, and excluded Montea, Shurgard, and Xior. The Independent Supervisor retains the right to change the published selection until the final data publication after 18 December 2024. The BEL® Family indices are reviewed quarterly, with the next review scheduled for 12 March 2025.
- https://www.euronext.com/en/about/media/euronext-press-releases/euronext-announces-september-2024-quarterly-review-results-belr - Euronext announced the results of the September 2024 quarterly review for the BEL® Family indices, effective from 23 September 2024. The BEL 20® index remained unchanged. In the BEL Mid® index, Deceuninck and Econocom Group were excluded. The BEL Small® index saw Deceuninck, Econocom Group, and Hyloris excluded. The BEL® ESG index included D'Ieteren Group and excluded Colruyt. The Independent Supervisor retains the right to change the published selection until the final data publication after 18 September 2024. The BEL® Family indices are reviewed quarterly, with the next review scheduled for 11 December 2024.
- https://www.euronext.com/en/about/media/euronext-press-releases/euronext-announces-june-2024-quarterly-review-results-belr - Euronext announced the results of the June 2024 quarterly review for the BEL® Family indices, effective from 24 June 2024. The BEL 20® index included Azelis Group. In the BEL Mid® index, CIE BOIS SAUVAGE was included, and Azelis Group and Orange Belgium were excluded. The BEL Small® index saw Mithra excluded. The BEL® ESG index included Colruyt and Proximus, and excluded EVS Broadcast Equipment. The Independent Supervisor retains the right to change the published selection until the final data publication after 19 June 2024. The BEL® Family indices are reviewed quarterly, with the next review scheduled for 11 September 2024.
- https://www.euronext.com/en/about/media/euronext-press-releases/euronext-announces-september-2023-quarterly-review-results-belr - Euronext announced the results of the September 2023 quarterly review for the BEL® Family indices, effective from 18 September 2023. The BEL 20® index remained unchanged. In the BEL Mid® index, Exmar was included. The BEL Small® index saw Exmar included. The BEL® ESG index included Bpost and Montea, and excluded AB InBev. The Independent Supervisor retains the right to change the published selection until the final data publication after 13 September 2023. The BEL® Family indices are reviewed quarterly, with the next review scheduled for 6 December 2023.
Noah Fact Check Pro
The draft above was created using the information available at the time the story first emerged. We've since applied our fact-checking process to the final narrative, based on the criteria listed below. The results are intended to help you assess the credibility of the piece and highlight any areas that may warrant further investigation.
Freshness check
Score: 10
Notes: The narrative is based on a press release from Euronext, dated 10 September 2025, announcing the results of the September 2025 quarterly review for the BEL® Family indices. This is the earliest known publication date for this information, indicating high freshness. Press releases typically warrant a high freshness score due to their timely and original content.
Quotes check
Score: 10
Notes: The narrative does not contain any direct quotes. The absence of quotes suggests that the content is original and not recycled from other sources.
Source reliability
Score: 10
Notes: The narrative originates from Euronext, a reputable organisation in the financial sector. This enhances the reliability of the information presented.
Plausability check
Score: 10
Notes: The claims made in the narrative align with Euronext's standard quarterly review process for the BEL® Family indices. The inclusion and exclusion of specific companies from the BEL Mid® and BEL Small® indices are consistent with previous quarterly reviews. (euronext.com) The decision to keep the BEL® ESG index unchanged pending further assessment is plausible and reflects standard industry practices.
Overall assessment
Veredict (FAIL, OPEN, PASS): PASS
Confidence (LOW, MEDIUM, HIGH): HIGH
Summary: The narrative is a timely and original press release from Euronext, detailing the September 2025 quarterly review results of the BEL® Family indices. The information is consistent with Euronext's established practices, and the source is highly reliable, leading to a high confidence in the accuracy and credibility of the content.