WhichIndex

Which indexes is Aon plc in?

Aon plc is in 2 of the 57 indexes we track. Its largest weight is 0.13% (estimated from market cap) in the NYSE Composite, where it ranks #181 of 1865.

Ticker
AON (NYSE)
Country
United States
Sector
Financials
Size
Large cap (market cap $10–200 billion; exact figure in the ranking)
Data as of
16 Oct 2026

Member of 2 indexes

Aon plc's index memberships
IndexWeight %RankIndex size
NYSE Composite0.13 (est.)1811865
S&P 5000.09188502

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.

Aon plc across every index we track

Lit tiles are the indexes Aon plc 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 5000.09%
  7. Nasdaq-100not in
  8. Dow Jonesnot in
  9. Russell 2000not in
  10. Nasdaq Compositenot in
  11. NYSE Composite0.13%

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 35not in
  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

The members ranked just above and just below Aon plc in each index
IndexRanked aboveRanked below
NYSE CompositeAllstate (0.13%)Boston Scientific (0.13%)
S&P 500Ametek (0.09%)Cardinal Health (0.09%)

Not in

Among the indexes we track for United States.