Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in AON held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 15.7M | $5.21B | -2.7% | 7.409% | 0.08% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 13.6M | $4.51B | +0.2% | 6.413% | 0.10% |
| 3 | JPMORGAN CHASE & CO | 12.2M | $3.99B | +115.8% | 5.740% | 0.22% |
| 4 | Capital World Investors | 11.7M | $3.88B | +2.0% | 5.521% | 0.46% |
| 5 | STATE STREET CORP | 9.4M | $3.12B | +2.1% | 4.439% | 0.05% |
| 6 | DODGE & COX | 8.6M | $2.85B | +5.9% | 4.051% | 1.49% |
| 7 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 7.6M | $2.58B | -8.9% | 3.590% | 0.82% |
| 8 | VANGUARD PORTFOLIO MANAGEMENT LLC | 7.2M | $2.39B | +58.0% | 3.396% | 0.11% |
| 9 | MORGAN STANLEY | 6.2M | $2.06B | -2.5% | 2.930% | 0.11% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 5.2M | $1.71B | -1.2% | 2.442% | 0.09% |
| 11 | Bank of New York Mellon Corp | 3.2M | $1.06B | -3.9% | 1.504% | 0.17% |
| 12 | NORGES BANK | 2.8M | $927.7M | — | 1.318% | 0.09% |
| 13 | Mitsubishi UFJ Asset Management Co., Ltd. | 2.8M | $913.4M | +9.4% | 1.298% | 0.51% |
| 14 | Independent Franchise Partners LLP | 2.6M | $878.0M | +2.3% | 1.248% | 5.76% |
| 15 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2.6M | $867.3M | +227.9% | 1.233% | 0.38% |
| 16 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt | 2.3M | $748.2M | -23.5% | 1.063% | 0.57% |
| 17 | Boston Partners | 2.1M | $695.8M | +6.9% | 0.985% | 0.62% |
| 18 | NORTHERN TRUST CORP | 2.0M | $676.8M | -2.0% | 0.962% | 0.08% |
| 19 | AQR CAPITAL MANAGEMENT LLC | 1.9M | $623.0M | +94.5% | 0.898% | 0.22% |
| 20 | WCM INVESTMENT MANAGEMENT, LLC | 1.9M | $614.5M | -3.9% | 0.884% | 1.11% |
| 21 | Artisan Partners Limited Partnership | 1.9M | $613.8M | +12.6% | 0.872% | 0.97% |
| 22 | GOLDMAN SACHS GROUP INC | 1.7M | $580.1M | +10.4% | 0.824% | 0.05% |
| 23 | Neuberger Berman Group LLC | 1.7M | $561.1M | -8.9% | 0.797% | 0.19% |
| 24 | BANK OF AMERICA CORP /DE/ | 1.6M | $539.0M | +2.7% | 0.766% | 0.03% |
| 25 | Veritas Asset Management LLP | 1.4M | $467.1M | -7.4% | 0.664% | 8.40% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in AON — a direct measure of their conviction.
Filings activity in AON during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 1,263 | +1.2% | 90.71% | +2.38 pp | $61.52B | +4.3% |
| Q1 2026 | 1,248 | 0.2% | 88.33% | 0.56 pp | $59.00B | 9.6% |
| Q4 2025 | 1,250 | +2.9% | 88.89% | +1.18 pp | $65.27B | +0.5% |
| Q3 2025 | 1,215 | +2.3% | 87.71% | 3.46 pp | $64.94B | 2.6% |
| Q2 2025 | 1,188 | 3.3% | 91.17% | +0.83 pp | $66.65B | 8.8% |
| Q1 2025 | 1,228 | +8.9% | 90.34% | 0.05 pp | $73.04B | +10% |
| Q4 2024 | 1,128 | +3.5% | 90.39% | +1.73 pp | $66.22B | +2.8% |
| Q3 2024 | 1,090 | — | 88.66% | — | $64.42B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying AON stock.
Based on Q2 2026 13F filings, institutional ownership of Aon plc stands at 90.7%, held across 1,263 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of AON, with approximately 15,716,429 shares worth $5.21B as of Q2 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of AON.
Our composite Smart Money Score for AON is 48 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
123 institutions opened new positions in AON during Q2 2026, while 113 fully exited. 777 added to existing positions and 328 trimmed.
AON institutional ownership rose by 2.38 percentage points quarter-over-quarter, with a net change of +15 holders.
The top 10 institutions account for 52.5% of all reported 13F value in AON, and the top 25 account for 70.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Aon plc (AON) Institutional Ownership