TotalMarketCap

Aon

AONNYSE United StatesFinanceSpecialty Insurers

Market cap

$57.709 B

$272.05 +0.96%

Close of 6 Oct 2026

As of 6 Oct 2026, Aon (AON) has a market capitalization of $57.7B. Market cap measures the value of outstanding equity at market prices; company totals combine applicable share classes. Prices and market caps come from Nasdaq, with financial fundamentals from SEC filings. See sources and calculation details.

Revenue

$17.2B

#263 by revenue

Earnings

$3.69B

#135 by earnings

Shares outstanding

212,125,434

Latest filing cover page

P/E ratio

15.6

Cap ÷ net income

Specialty Insurers, ranked by market cap

All 34 →
  1. #1Marsh & Mclennan CompaniesMRSH$81.3B
  2. #2Arthur J. Gallagher & Co.AJG$58.2B
  3. #3AonAON$57.7B
  4. #4Willis Towers WatsonWTW$26.8B
  5. #5Brown & BrownBRO$20.4B

What if Aon were worth as much as…

Open the what-if tool →

Gold $28.8T

$135,914.44

Per share 500× higher

Bitcoin $1.68T

$7,934.47

Per share 29.2× higher

Nvidia $5.76T

$27,141.91

Per share 99.8× higher

Or at a round number

$100.0B$200.0B$500.0B$1.00T

Where these numbers come from

Share counts and financials for Aon are taken from its own SEC filings via EDGAR: public record, not an estimate. Market cap is shares outstanding multiplied by the latest close. Last updated 7 Oct 2026. Read the methodology.