Aon plc
AON- Exchange
- NYSE
- Industry
- Insurance Agents, Brokers & Service
- SEC CIK
- 0000315293
In the last 90 days, Aon plc insiders filed 1 open-market purchase and 3 sales; 1,273 institutions reported holding it in 13F filings for Q2 2026, worth $63.9B in total; 4 superinvestors hold it, including Viking Global Investors and Baupost Group.
Superinvestors holding AON, Q2 2026
4 superinvestors report holding Aon plc on Form 13F, worth $725.7M in total. Weight is Aon plc's share of each 13F portfolio; actions compare shares with Q1 2026.
| Superinvestor | % of portfolio | Shares | Value | vs. previous quarter |
|---|---|---|---|---|
| Viking Global InvestorsAndreas Halvorsen | 1.1% | 1,151,269 | $381.9M | Added+5.9% |
| Baupost GroupSeth Klarman | 4.2% | 687,000 | $227.9M | Reduced−10.7% |
| Weitz Investment ManagementWally Weitz | 4.9% | 213,860 | $70.9M | Unchanged |
| Markel GroupTom Gayner | 0.3% | 135,800 | $45.0M | Unchanged |
Moves by quarter
Superinvestors that opened, added to, trimmed or sold out of AON each quarter, comparing shares with the quarter before. A superinvestor that didn't file for a quarter isn't listed, and isn't counted as selling.
Q2 2026
4 superinvestors holding at quarter end
- Added
- Viking Global Investors (+5.9%)
- Reduced
- Baupost Group (−10.7%)
Q1 2026
4 superinvestors holding at quarter end
- New
- Baupost Group
- Added
- Viking Global Investors (+38.7%), Markel Group (+1.3%)
- Reduced
- Weitz Investment Management (−2.2%)
- Sold out
- Berkshire Hathaway, Harris Associates (Oakmark)
Q4 2025
5 superinvestors holding at quarter end
- Added
- Weitz Investment Management (+2.5%), Markel Group (+3.3%)
- Reduced
- Berkshire Hathaway (−12.1%), Viking Global Investors (−44.6%), Harris Associates (Oakmark) (−0.7%)
Q3 2025
5 superinvestors holding at quarter end
- New
- Viking Global Investors
- Added
- Harris Associates (Oakmark) (+0.7%)
Q2 2025
4 superinvestors holding at quarter end
- New
- Harris Associates (Oakmark)
- Added
- Markel Group (+0.3%)
Q1 2025
3 superinvestors holding at quarter end
- Added
- Markel Group (+2.6%)
- Reduced
- Weitz Investment Management (−18.2%)
- Sold out
- Viking Global Investors
Q4 2024
4 superinvestors holding at quarter end
- Added
- Viking Global Investors (+27.9%), Markel Group (+5.0%)
Q3 2024
4 superinvestors holding at quarter end
- New
- Viking Global Investors
- Added
- Markel Group (+5.4%)
Q2 2024
3 superinvestors holding at quarter end
- Added
- Weitz Investment Management (+64.8%), Markel Group (+3.5%)
Q1 2024
3 superinvestors holding at quarter end
- Added
- Weitz Investment Management (+9.4%), Markel Group (+4.5%)
- Sold out
- Maverick Capital
Q4 2023
4 superinvestors holding at quarter end
- New
- Maverick Capital
- Added
- Markel Group (+5.8%)
Q3 2023
3 superinvestors holding at quarter end
- Added
- Markel Group (+7.0%)
- Reduced
- Berkshire Hathaway (−5.4%)
- Sold out
- Maverick Capital
Q2 2023
4 superinvestors holding at quarter end
- Added
- Markel Group (+7.5%)
- Reduced
- Weitz Investment Management (−0.5%), Maverick Capital (−21.5%)
- Sold out
- Harris Associates (Oakmark)
Q1 2023
5 superinvestors holding at quarter end
- Added
- Markel Group (+8.1%), Maverick Capital (+106.2%)
- Reduced
- Berkshire Hathaway (−1.4%), Weitz Investment Management (−1.7%)
Q4 2022
5 superinvestors holding at quarter end
- New
- Maverick Capital
- Added
- Markel Group (+8.1%)
- Reduced
- Harris Associates (Oakmark) (−54.4%)
Q3 2022
4 superinvestors holding at quarter end
- Added
- Markel Group (+7.3%)
- Reduced
- Harris Associates (Oakmark) (−1.2%)
- Sold out
- Viking Global Investors
Q2 2022
5 superinvestors holding at quarter end
- Added
- Markel Group (+6.2%)
- Reduced
- Viking Global Investors (−55.8%), Weitz Investment Management (−6.3%), Harris Associates (Oakmark) (−5.4%)
Q1 2022
5 superinvestors holding at quarter end
- Added
- Viking Global Investors (+5.5%), Markel Group (+11.8%)
- Reduced
- Weitz Investment Management (−37.1%), Harris Associates (Oakmark) (−58.2%)
- Sold out
- Maverick Capital
Q4 2021
6 superinvestors holding at quarter end
- New
- Viking Global Investors, Maverick Capital
- Added
- Markel Group (+12.6%)
- Reduced
- Weitz Investment Management (−36.5%), Harris Associates (Oakmark) (−26.6%)
Q3 2021
4 superinvestors holding at quarter end
- Added
- Markel Group (+14.9%)
- Reduced
- Weitz Investment Management (−6.6%), Harris Associates (Oakmark) (−6.0%)
- Sold out
- Viking Global Investors, Maverick Capital
Q2 2021
6 superinvestors holding at quarter end
- Added
- Berkshire Hathaway (+7.3%), Viking Global Investors (+34.7%), Markel Group (+8.2%)
- Reduced
- Maverick Capital (−51.0%)