WEITZ INVESTMENT MANAGEMENT, INC.: AON PLC (AON): Quarterly 13F Position History
As of Q1 2026, WEITZ INVESTMENT MANAGEMENT, INC. reported 213,860 shares of AON PLC (AON), worth $69.0M and representing 4.8% of its 13F equity book. Quarter-over-quarter share count change: 4,875 (-2.2%) . The position first appeared in Q2 2020 and has been disclosed across 24 13F-HR filings in Pactolio's tracked window.
- 213,860Shares Held (Latest Filing)
- $69.0MReported Market Value (Latest Filing)
- 4.8%Portfolio Weight (% of 13F Equity Book)
- 4,875Quarter-over-Quarter Share Change
- -$8.2MQuarter-over-Quarter Value Change
- 422,850Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 24 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 213,860 | 4,875 | -2.2% | $69.0M | 4.8% | $322.8 |
| Q4 2025 | 218,735 | +5,285 | +2.5% | $77.2M | 4.6% | $352.9 |
| Q3 2025 | 213,450 | 0 | — | $76.1M | 4.1% | $356.6 |
| Q2 2025 | 213,450 | 0 | — | $76.2M | 4.1% | $356.8 |
| Q1 2025 | 213,450 | 47,500 | -18.2% | $85.2M | 4.5% | $399.1 |
| Q4 2024 | 260,950 | 0 | — | $93.7M | 4.8% | $359.2 |
| Q3 2024 | 260,950 | 0 | — | $90.3M | 4.5% | $346.0 |
| Q2 2024 | 260,950 | +102,650 | +64.8% | $76.6M | 4.0% | $293.6 |
| Q1 2024 | 158,300 | +13,650 | +9.4% | $52.8M | 2.7% | $333.7 |
| Q4 2023 | 144,650 | 0 | — | $42.1M | 2.2% | $291.0 |
| Q3 2023 | 144,650 | 0 | — | $46.9M | 2.6% | $324.2 |
| Q2 2023 | 144,650 | 750 | -0.5% | $49.9M | 2.7% | $345.2 |
| Q1 2023 | 145,400 | 2,500 | -1.7% | $45.8M | 2.6% | $315.3 |
| Q4 2022 | 147,900 | 0 | — | $44.4M | 2.5% | $300.1 |
| Q3 2022 | 147,900 | 0 | — | $39.6M | 2.3% | $267.9 |
| Q2 2022 | 147,900 | 10,000 | -6.3% | $39.9M | 2.1% | $269.7 |
| Q1 2022 | 157,900 | 93,007 | -37.1% | $51.4M | 2.3% | $325.6 |
| Q4 2021 | 250,907 | 144,153 | -36.5% | $75.4M | 3.0% | $300.6 |
| Q3 2021 | 395,060 | 27,790 | -6.6% | $112.9M | 4.7% | $285.8 |
| Q2 2021 | 422,850 | 0 | — | $101.0M | 4.3% | $238.8 |
| Q1 2021 | 422,850 | +56,300 | +15.4% | $97.3M | 4.3% | $230.1 |
| Q4 2020 | 366,550 | +45,500 | +14.2% | $77.4M | 3.3% | $211.3 |
| Q3 2020 | 321,050 | +33,700 | +11.7% | $66.2M | 3.1% | $206.3 |
| Q2 2020 | 287,350 | — | — | $55.3M | 2.7% | $192.6 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did WEITZ INVESTMENT MANAGEMENT, INC. first disclose a AON position in 13F-HR filings?
WEITZ INVESTMENT MANAGEMENT, INC. first reported AON PLC (AON) on its 13F-HR filing for the period ending 2020-06-30 (Q2 2020). The position has appeared on 24 reported quarters within Pactolio's tracked window.
What was WEITZ INVESTMENT MANAGEMENT, INC.'s most recent quarter-over-quarter share-count change in AON?
Between Q4 2025 and Q1 2026, WEITZ INVESTMENT MANAGEMENT, INC. reduced its AON position by 4,875 shares (-2.2%), leaving 213,860 shares at a market value of $69.0M.
Does the implied price-per-share represent WEITZ INVESTMENT MANAGEMENT, INC.'s cost basis in AON?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.