When did AON join the S&P 500?

Aon plc joined the S&P 500 index on 1996-04-23.

What sector is AON in?

AON is in the Financials sector, Insurance Brokers industry.

AON — Aon plc

Name: AON Institutional Holdings (13F) — 2026Q1
Creator: SEC EDGAR
License: https://www.sec.gov/data

Insurance Brokers · Financials

Aon provides risk, health and wealth solutions. Its risk capital business includes claims management, reinsurance, risk analysis, risk management, risk retention and risk transfer. Its

Key Facts

Status	Active
Sector	Financials
Industry	Insurance Brokers
Joined	1996-04-23
Tenure	30 yrs

S&P 500 Timeline

1996-04-23Joined S&P 500

Industry Peers

AJG BRO ERIE MRSH WTW

Sector Peers

ACGL AFL AIG AIZ AJG ALL AMP APO ARES AXP

Institutional Holdings (13F)

1,260 institutions hold AON, totaling 251.9M shares ($78.4B) · As of 2026Q1

Rank	Institution	Shares	Value
1	VANGUARD CAPITAL MANAGEMENT LLC	27.2M	$8.8B
2	DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main	28.2M	$7.0B
3	MORGAN STANLEY	18.1M	$6.2B
4	BlackRock, Inc.	16.1M	$5.2B
5	Capital World Investors	11.5M	$3.7B
6	BARCLAYS PLC	9.4M	$3.1B
7	STATE STREET CORP	9.2M	$3.0B
8	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	8.4M	$2.8B
9	Dodge & Cox	8.1M	$2.6B
10	JPMORGAN CHASE & CO	5.6M	$1.8B

View all holders →

Data source: Wikipedia · CC BY-SA 4.0 · SEC EDGAR 13F · Updated 2026-07-10