AON fund manager activity
Aon plc · NYSE. Reported by 20 tracked fund managers in their 13F filings, Q1 2020 to Q3 2026.
Q1 2026
| Manager | Activity | Shares | Value | % of portfolio | Filed |
|---|---|---|---|---|---|
| Seth Klarman - Baupost Group | New | 769,000 | $248,218,000 | 4.85% | May 14, 2026 |
| Warren Buffett - Berkshire Hathaway | Sold out | — | — | 0.00% | May 15, 2026 |
| William Von Mueffling - Cantillon Capital Management | Trimmed | 1,095,574 | $353,629,376 | 2.35% | May 7, 2026 |
| Dodge & Cox Funds | Added | 8,116,095 | $2,619,713,144 | 1.44% | May 14, 2026 |
| First Pacific Advisors | Added | 703,258 | $226,997,617 | 3.24% | May 14, 2026 |
| Ken Fisher - Fisher Asset Management | Sold out | — | — | 0.00% | May 5, 2026 |
| Joel Greenblatt - Gotham Asset Management | Added | 88,805 | $28,664,478 | 0.09% | May 15, 2026 |
| Jensen Investment Management | Added | 25,569 | $8,253,162 | 0.16% | May 5, 2026 |
| Thomas Gayner - Markel Group | Added | 135,800 | $43,833,524 | 0.37% | May 1, 2026 |
| David Katz - Matrix Asset Advisors | No change | 648 | $209,161 | 0.02% | Apr 22, 2026 |
| Bill Nygren - Oakmark Funds | Sold out | — | — | 0.00% | May 15, 2026 |
| Polen Capital Management | Trimmed | 1,354,053 | $437,061,344 | 3.02% | May 14, 2026 |
| Viking Global Investors | Added | 1,087,114 | $350,898,657 | 0.98% | May 15, 2026 |
| Wallace Weitz - Weitz Investment Management | Trimmed | 213,860 | $69,029,731 | 4.82% | May 14, 2026 |
| Yacktman Asset Management | No change | 12,915 | $4,168,704 | 0.06% | May 1, 2026 |
Q4 2025
| Manager | Activity | Shares | Value | % of portfolio | Filed |
|---|---|---|---|---|---|
| Warren Buffett - Berkshire Hathaway | Trimmed | 3,602,995 | $1,271,424,876 | 0.46% | Feb 17, 2026 |
| William Von Mueffling - Cantillon Capital Management | Added | 1,243,018 | $438,636,192 | 2.37% | Feb 11, 2026 |
| Dodge & Cox Funds | Added | 7,852,456 | $2,770,974,673 | 1.50% | Feb 13, 2026 |
| First Pacific Advisors | Added | 656,531 | $231,676,659 | 3.11% | Feb 17, 2026 |
| Ken Fisher - Fisher Asset Management | Added | 635 | $224,088 | 0.00% | Feb 9, 2026 |
| Joel Greenblatt - Gotham Asset Management | Trimmed | 81,509 | $28,762,896 | 0.11% | Feb 17, 2026 |
| Jensen Investment Management | Added | 10,603 | $3,741,587 | 0.06% | Feb 11, 2026 |
| Thomas Gayner - Markel Group | Added | 134,050 | $47,303,564 | 0.38% | Feb 6, 2026 |
| David Katz - Matrix Asset Advisors | No change | 648 | $228,666 | 0.02% | Jan 16, 2026 |
| Bill Nygren - Oakmark Funds | Trimmed | 699 | $246,663 | 0.00% | Feb 17, 2026 |
| Polen Capital Management | Trimmed | 1,846,294 | $651,520,305 | 2.78% | Feb 12, 2026 |
| Viking Global Investors | Trimmed | 783,650 | $276,534,412 | 0.73% | Feb 17, 2026 |
| Wallace Weitz - Weitz Investment Management | Added | 218,735 | $77,187,207 | 4.58% | Feb 12, 2026 |
| Yacktman Asset Management | No change | 12,915 | $4,557,445 | 0.06% | Feb 3, 2026 |