Aon plc
Aon plc (AON) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · AON · as of Sep 30, 2025
Ownership Breakdown
1,277
Institutional Holders
▲ 14 vs Q2
$66.19B
Total Inst. Value
▼ $2.96B vs Q2
213.58M
Shares Outstanding
freeFloat 98.77%
185.59M
13F Shares Held
▼ 8.26M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
AON largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC insurance agents, brokers & service | 19.98M | 9.24% | 9.24% | $7.12T | Nov 7, 2025 | ▼ 310.4K |
BLACKROCK, INC. insurance agents, brokers & service | 15.85M | 7.33% | 7.33% | $5.65T | Nov 12, 2025 | ▼ 84.2K |
CAPITAL WORLD INVESTORS insurance agents, brokers & service | 12.08M | 5.59% | 5.59% | $4.31T | Nov 13, 2025 | ▼ 67.5K |
STATE STREET CORP insurance agents, brokers & service | 9.23M | 4.27% | 4.27% | $3.29T | Nov 14, 2025 | ▲ 105.2K |
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ insurance agents, brokers & service | 8.76M | 4.05% | 4.05% | $3.12T | Oct 29, 2025 | ▼ 194.3K |
MORGAN STANLEY insurance agents, brokers & service | 6.14M | 2.84% | 2.84% | $2.19T | May 27, 2026 | ▼ 3.33M |
GEODE CAPITAL MANAGEMENT, LLC insurance agents, brokers & service | 5.11M | 2.37% | 2.37% | $1.82T | Nov 12, 2025 | ▼ 475.0K |
BERKSHIRE HATHAWAY INC insurance agents, brokers & service | 4.10M | 1.90% | 1.90% | $1.46T | Nov 14, 2025 | — held |
BANK OF NEW YORK MELLON CORP insurance agents, brokers & service | 3.72M | 1.72% | 1.72% | $1.32T | Nov 3, 2025 | ▲ 207.7K |
DODGE & COX insurance agents, brokers & service | 3.46M | 1.60% | 1.60% | $1.24T | Nov 13, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
23
Increased
+5.21M shares2
New Positions
first time holders24
Decreased
−10.03M shares0
Sold Out
fully exitedNet shares change (top 50)
4.82M
+5.21M / −10.03M
Net new holders
+1
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
AON insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
1
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
NOTEBAERT RICHARD C director | May 12, 2026 | Gift | 1,438 | — | — | 27.7K | Form 4 ↗ |
Corona Anne Chief Commercial Officer | Mar 13, 2026 | Tax Withhold | 77.08 | $321.41 | $24.8K | 4.2K | Form 4 ↗ |
Corona Anne Chief Commercial Officer | Mar 13, 2026 | Tax Withhold | 85.497 | $321.41 | $27.5K | 4.1K | Form 4 ↗ |
Goltermann Lori CEO, Regions & North America | Mar 13, 2026 | Tax Withhold | 126.147 | $321.41 | $40.5K | 6.8K | Form 4 ↗ |
Goltermann Lori CEO, Regions & North America | Mar 13, 2026 | Tax Withhold | 99.177 | $321.41 | $31.9K | 6.6K | Form 4 ↗ |
Marcell Andy Global CEO, Solution Lines | Mar 13, 2026 | Tax Withhold | 225.961 | $321.41 | $72.6K | 8.8K | Form 4 ↗ |
Marcell Andy Global CEO, Solution Lines | Mar 13, 2026 | Tax Withhold | 567.825 | $321.41 | $182.5K | 8.6K | Form 4 ↗ |
Zeidel Darren General Counsel | Feb 26, 2026 | Sale | 4,300 | $329.72 | $1.42M | 16.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Aon plc (AON) is primarily owned by institutional investors, who hold approximately 86.9% of total shares outstanding. Company insiders own approximately 1.23%, while retail and public investors account for the remaining 11.87%.
The largest institutional shareholder of Aon plc is VANGUARD GROUP INC, holding approximately 19.98 million shares — equal to 9.24% of outstanding shares — as of September 30, 2025.
A total of 1,277 institutional investors currently hold AON stock, with a combined institutional value of approximately $66.19 billion as of the most recent 13F filing period.
Frequently asked questions
AON ownershipAon plc (AON) is primarily owned by institutional investors, who hold approximately 86.9% of shares. The largest shareholder is VANGUARD GROUP INC with a 9.24% stake. Company insiders hold 1.23%. Data sourced from SEC Form 13F as of September 30, 2025.