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AON · Aon plc · Holdings

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$269.50 +0.05 (+0.02%)
Market Cap
$58.11B
Shares
212.13M
Volume · Oct 5 1.37M Avg daily vol (3M) 1.52M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 1,268
Total Value: $64,009,513,143
Total Shares: 193,189,389
Showing 1–100 of 1,290 holdings by value · page 1 of 13

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 1,270 13F filers
Top Holder
8.1%
Sep 2023 → Jun 2026 · range 8.1% – 10.7%
of institutional value
Top 5
32.5%
Sep 2023 → Jun 2026 · range 31.3% – 36.1%
of institutional value
Top 10
50.5%
Sep 2023 → Jun 2026 · range 47.2% – 50.7%
of institutional value
HHI
315
Sep 2023 → Jun 2026 · range 291 – 360
Broadly held
Showing 100 of 1,290
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 315293 CUSIP G0403H108 13F (30d) 56 filings 17 filers Visit website Investor relations