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Aon plc
AON - CIK 0000315293
Market cap$71.82 B
Rank#236
SEC filings1,000
Market capitalization of Aon plc
As of 2026-06-10, Aon plc (AON) has a market capitalization of $71.82 B, making it the #236 most valuable US-listed company.
Recent market cap readings
| Date | Market cap |
|---|---|
| 2026-06-10 | $71.82 B |
| 2026-05-29 | $67.23 B |
| 2026-05-28 | $68.03 B |
| 2026-05-26 | $68.64 B |
| 2026-05-25 | $69.37 B |
| 2026-05-24 | $69.37 B |
| 2026-05-22 | $69.37 B |
Readings accumulate daily as market data refreshes, combining SEC-reported share counts with live prices.
Market Cap of similar companies
Frequently asked questions
What is Aon plc's market cap?
As of 2026-06-10, Aon plc (AON) has a market capitalization of $71.82 B, making it the #236 most valuable US-listed company.
Where does Aon plc rank by market cap?
Aon plc is the #236 largest US-listed company by market capitalization.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.