OMERS ADMINISTRATION Corp reported AON CORP COM (AON) in 32 quarterly 13F filings from 2023 Q4 through 2025 Q4. Peak portfolio weight reached 2.27% in 2024 Q1. The latest visible filing shows AON at 1.43% of the fund.
This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings. Older history is available after unlock; the visible window still shows the most recent pattern.
This page is designed to answer the real investor question behind a 13F filing: how meaningful was OMERS ADMINISTRATION Corp's position in AON CORP COM, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.
AON was reported at 1.43% of portfolio in the most recent visible filing.
Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.
Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.
Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.
As of 2026 Q1 — sorted by position size
These are the practical questions this page is built to answer before you even open the full history table.
OMERS ADMINISTRATION Corp reported AON across 9 quarterly 13F filings, from 2023 Q4 through 2025 Q4.
The largest reported portfolio weight for AON was 2.27% in 2024 Q1.
The most recent filing on this page is 2025 Q4, when OMERS ADMINISTRATION Corp reported 567,479 shares, equal to 1.43% of portfolio, with an estimated market value of $200.3M.
The chart compares OMERS ADMINISTRATION Corp's quarterly AON portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.
Based on 13F filing dates vs. subsequent AON price moves, OMERS ADMINISTRATION Corp correctly timed 13 out of 20 reported position changes (65%). The annualised alpha on AON relative to SPY over the holding period was -5.7%.