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AON · Aon plc

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$348.43 +5.23 (+1.52%) At close · Aug 19
Market Cap
$72.80B
Shares
212.13M

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.

Holders: 1,251
Total Value: $63,774,250,199
Total Shares: 192,916,421

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,251 13F filers · Δ vs Mar 31, 2026
Top Holder
8.2%
Sep 2023 → Jun 2026 · range 8.2% – 10.7%
−0.4 pts
Top 5
32.6%
Sep 2023 → Jun 2026 · range 31.3% – 36.1%
+1.3 pts
Top 10
50.7%
Sep 2023 → Jun 2026 · range 47.2% – 50.8%
+3.5 pts
HHI
317
Sep 2023 → Jun 2026 · range 291 – 360
Broadly held+26

Quarterly Activity

vs Mar 31, 2026
New
138
Increased
465
Decreased
454
Sold Out
149
Unchanged
194
Holder count: -11
Institutional value: +5.1%
Shares held: +2.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,274
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 315293 CUSIP G0403H108 13F (30d) 1110 filings 1062 filers Visit website Investor relations