BIST 100BIST 100 companies

The BIST 100 tracks 100 Turkish companies. As of 30 Sep 2026 the largest is Aselsan at 13.56% of the index, and the 10 largest make up 49.83%.

Members

100

Weighting

Free-float market cap, capped

Provider

Borsa Istanbul

Review

Quarterly (Mar, Jun, Sep, Dec)

Country

Turkey

Data as of

30 Sep 2026

Source: Borsa Istanbul index constituent file, as of 2026-09-30; weights estimated from market cap. How we source this.

Members

Concentration

The 10 largest members make up 49.83% of the index.

• Aselsan13.56%
• Tupras6.37%
• Koc Holding4.65%
• Garanti Bankasi4.56%
• Bim Magazalar4.38%
• Enka Insaat4.28%
• Turk Hava Yollari3.43%
• Akbank3.03%
• Vakiflar Bankasi2.82%
• T. Halk Bankasi2.75%

Which other indexes share members with the BIST 100

No other index we track shares a member with the BIST 100.

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 Compositeno shared members
11. NYSE Compositeno shared members

Europe

1. Euro Stoxx 50no shared members
2. ATXno shared members
3. BEL 20no shared members
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. LuxXno shared members
15. AEXno shared members
16. AMXno shared members
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 100this index
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 40no shared members
7. ADX Generalno shared members

Fewermore

Recent changes

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

Questions

How many companies are in the BIST 100?

The BIST 100 has 100 members. We show 100 as of 30 Sep 2026.

What is the largest company in the BIST 100?

Aselsan, at 13.56% of the index as of 30 Sep 2026.

How is the BIST 100 weighted?

Free-float market cap, capped, according to Borsa Istanbul.

When is the BIST 100 reviewed?

Quarterly (Mar, Jun, Sep, Dec).

Sources