BEL 20BEL 20 companies

The BEL 20 tracks 20 Belgian companies. As of 22 Oct 2026 the largest is UCB at 15.07% of the index, and the 10 largest make up 78.26%.

Members

20

Weighting

Free-float market cap, capped

Provider

Euronext

Review

Quarterly, annual review in March

Country

Belgium

Data as of

22 Oct 2026

Source: Amundi BEL 20 UCITS ETF (FR0000021842) holdings, as of 2026-10-22 (ETF weights, not the provider's). How we source this.

Members

Concentration

The 10 largest members make up 78.26% of the index.

• UCB15.07%
• AB InBev13.17%
• Argenx11.07%
• KBC10.07%
• Ageas8.07%
• Elia Group4.46%
• Aedifica4.28%
• Syensqo4.08%
• GBL4.00%
• Ackermans & van Haaren3.99%

Which other indexes share members with the BEL 20

Shade shows how many members each index shares with the BEL 20.

Americas

1. S&P Mervalno shared members
2. Ibovespano shared members
3. S&P/TSX Compositeno shared members
4. S&P IPSAno shared members
5. S&P/BMV IPCno shared members
6. S&P 500no shared members
7. Nasdaq-100no shared members
8. Dow Jonesno shared members
9. Russell 2000no shared members
10. Nasdaq Composite1 shared
11. NYSE Composite1 shared

Europe

1. Euro Stoxx 502 shared
2. ATXno shared members
3. BEL 20this index
4. OMX Copenhagen 20no shared members
5. OMX Tallinnno shared members
6. OMX Helsinki 25no shared members
7. CAC 40no shared members
8. DAXno shared members
9. OMX Iceland 15no shared members
10. ISEQ 20no shared members
11. FTSE MIBno shared members
12. OMX Rigano shared members
13. OMX Vilniusno shared members
14. LuxX1 shared
15. AEX1 shared
16. AMX1 shared
17. AMS Next 20no shared members
18. OSEBXno shared members
19. WIG20no shared members
20. PSIno shared members
21. MOEX Russiano shared members
22. IBEX 35no shared members
23. IBEX Medium Capno shared members
24. IBEX Small Capno shared members
25. OMX Stockholm 30no shared members
26. SMIno shared members
27. BIST 100no shared members
28. FTSE 100no shared members

Asia-Pacific

1. S&P/ASX 200no shared members
2. Shanghai Compositeno shared members
3. Hang Sengno shared members
4. Nifty 50no shared members
5. IDX Compositeno shared members
6. Nikkei 225no shared members
7. S&P/NZX 50no shared members
8. KSE 100no shared members
9. Straits Times Indexno shared members
10. KOSPIno shared members
11. VN-Indexno shared members

Middle East & Africa

1. EGX 30no shared members
2. TA-35no shared members
3. ASE Generalno shared members
4. QE Indexno shared members
5. TASIno shared members
6. JSE Top 401 shared
7. ADX Generalno shared members

Fewermore

• Euro Stoxx 50: 2 shared companies
• AEX: 1 shared company
• AMX: 1 shared company
• JSE Top 40: 1 shared company
• LuxX: 1 shared company
• NYSE Composite: 1 shared company
• Nasdaq Composite: 1 shared company

Related indexes: Euro Stoxx 50.

Recent changes

We started recording changes on 26 Oct 2026. None recorded yet.

Questions

How many companies are in the BEL 20?

The BEL 20 has 20 members. We show 20 as of 22 Oct 2026.

What is the largest company in the BEL 20?

UCB, at 15.07% of the index as of 22 Oct 2026.

How is the BEL 20 weighted?

Free-float market cap, capped, according to Euronext.

When is the BEL 20 reviewed?

Quarterly, annual review in March.

Which BEL 20 companies are also in the Euro Stoxx 50?

2 of them, as of 22 Oct 2026. The membership map below links the Euro Stoxx 50.

Sources