Which indexes is ACS in?

ACS is in 1 of the 57 indexes we track. Its largest weight is 2.53% in the IBEX 35, where it ranks #9 of 35.

Ticker

ACS (Bolsa de Madrid)

Country

Spain

Size

Large cap (market cap $10–200 billion; exact figure in the ranking)

Data as of

14 Oct 2026

Member of 1 index

Source: each index's own source, listed on its page. How we source this. Weights are estimates where marked. This page is refreshed when a membership changes or a weight moves by more than 10%; each index page has the daily figures.

ACS across every index we track

Lit tiles are the indexes ACS belongs to; the shade is its weight there.

Americas

1. S&P Mervalnot in
2. Ibovespanot in
3. S&P/TSX Compositenot in
4. S&P IPSAnot in
5. S&P/BMV IPCnot in
6. S&P 500not in
7. Nasdaq-100not in
8. Dow Jonesnot in
9. Russell 2000not in
10. Nasdaq Compositenot in
11. NYSE Compositenot in

Europe

1. Euro Stoxx 50not in
2. ATXnot in
3. BEL 20not in
4. OMX Copenhagen 20not in
5. OMX Tallinnnot in
6. OMX Helsinki 25not in
7. CAC 40not in
8. DAXnot in
9. OMX Iceland 15not in
10. ISEQ 20not in
11. FTSE MIBnot in
12. OMX Riganot in
13. OMX Vilniusnot in
14. LuxXnot in
15. AEXnot in
16. AMXnot in
17. AMS Next 20not in
18. OSEBXnot in
19. WIG20not in
20. PSInot in
21. MOEX Russianot in
22. IBEX 352.53%
23. IBEX Medium Capnot in
24. IBEX Small Capnot in
25. OMX Stockholm 30not in
26. SMInot in
27. BIST 100not in
28. FTSE 100not in

Asia-Pacific

1. S&P/ASX 200not in
2. Shanghai Compositenot in
3. Hang Sengnot in
4. Nifty 50not in
5. IDX Compositenot in
6. Nikkei 225not in
7. S&P/NZX 50not in
8. KSE 100not in
9. Straits Times Indexnot in
10. KOSPInot in
11. VN-Indexnot in

Middle East & Africa

1. EGX 30not in
2. TA-35not in
3. ASE Generalnot in
4. QE Indexnot in
5. TASInot in
6. JSE Top 40not in
7. ADX Generalnot in

Fewermore

Neighbours by weight

Not in

• ACS is not in the Euro Stoxx 50.
• ACS is not in the IBEX Medium Cap. It is in the IBEX 35 instead; the two do not share members by design.
• ACS is not in the IBEX Small Cap. It is in the IBEX 35 instead; the two do not share members by design.

Among the indexes we track for Spain and the euro area.