Institutional ownership · Form 13F
AON institutional ownership
Aon plc: reported institutional holdings as of 2026-06-30 (filed through 2026-08-31), aggregated by StockEyes from SEC Form 13F information tables. AON is one of 2732 tickers in the validated publication set. Mapping coverage in this publication set: 4562 of 6046 universe tickers have at least one validated CUSIP mapping (75.5%). Latest-quarter filed value resolved to any listed ticker: 77.3%; resolved to this universe: 77.2%.
AON: change since the prior quarter's filings
The number of reporting managers edged up from 1,241 in the quarter ended 2026-03-31 to 1,258 in the quarter ended 2026-06-30 (+17, 1.4%). Total reported shares rose to 192,889,552 (+5,293,056, 2.8%), moving the same way as the manager count. Among the 25 managers listed as top holders in both quarters, the largest increases were JPMORGAN CHASE & CO (+6,534,543 shares) and VANGUARD PORTFOLIO MANAGEMENT LLC (+2,643,956 shares), among 12 managers who added shares, and the largest decreases were FARALLON CAPITAL MANAGEMENT, L.L.C. (-1,130,076 shares) and MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (-742,700 shares), among 13 managers who reduced shares. NORGES BANK (2,796,760 shares), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (2,614,754 shares) and 3 more entered the listed top holders; Amundi (1,502,890 shares in the prior quarter), DIAMOND HILL CAPITAL MANAGEMENT INC (1,487,887 shares in the prior quarter) and 3 more dropped out of the listed top holders.
New to 13F data? Read how to read a 13F filing, or see where institutions moved overall in the Smart Money Report.
Reported totals, quarter ended 2026-06-30
1,258 reporting managers held 192,889,552 shares, reported value $61,622,858,654 exactly as filed. Values are position values transcribed from the filings, not current market prices.
Reported quarter-over-quarter change (quarter ended 2026-03-31 to quarter ended 2026-06-30): reporting managers +17, reported shares +5,293,056 (+2.82%), reported value +4.37%. These changes compare two filing snapshots.
Shares outstanding cross-check: no current issuer share-count point passed the freshness filter for this ticker, so the gate relied on holder-count and scale checks. See the hub methodology.
AON in this quarter's filings
Concentration check: the largest reported position, BlackRock, Inc. with 15,716,429 shares, is 8.1% of all shares reported for AON this quarter. The five largest reporting managers together account for 32.5% of the reported total, so the headline total is spread across a broad manager base rather than a few holders.
Reported quarter-over-quarter change: the reporting-manager count rose by 17 versus the quarter ended 2026-03-31, and reported shares moved +2.82% (+5,293,056 shares). That is a comparison of two filing snapshots, not a record of trades on any single day.
Shares-outstanding cross-check: no current issuer share-count point passed the freshness filter for AON, so the publication gate relied on holder-count scale, current-CUSIP validation, and quarter consistency for this ticker.
Largest reporting managers, AON
| # | Manager | Shares | Value as filed | Share of reported total |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | 15,716,429 | $5,212,982,529 | 8.1% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 13,603,465 | $4,512,133,306 | 7.1% |
| 3 | JPMORGAN CHASE & CO | 12,175,974 | $3,988,484,521 | 6.3% |
| 4 | Capital World Investors | 11,711,650 | $3,884,630,624 | 6.1% |
| 5 | STATE STREET CORP | 9,416,039 | $3,123,430,849 | 4.9% |
| 6 | Dodge & Cox | 8,593,144 | $2,850,259,933 | 4.5% |
| 7 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 7,615,397 | $2,575,299,415 | 3.9% |
| 8 | VANGUARD PORTFOLIO MANAGEMENT LLC | 7,202,991 | $2,389,160,085 | 3.7% |
| 9 | MORGAN STANLEY | 6,214,787 | $2,061,384,164 | 3.2% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 5,180,553 | $1,711,000,834 | 2.7% |
| 11 | Bank of New York Mellon Corp | 3,191,212 | $1,058,492,839 | 1.7% |
| 12 | NORGES BANK | 2,796,760 | $927,657,324 | 1.4% |
| 13 | Mitsubishi UFJ Asset Management Co., Ltd. | 2,753,913 | $913,445,403 | 1.4% |
| 14 | Independent Franchise Partners LLP | 2,646,943 | $877,964,523 | 1.4% |
| 15 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2,614,754 | $867,287,754 | 1.4% |
Manager names and figures are transcribed from each manager's own Form 13F information table. A manager listing shares in this snapshot does not mean it holds them today.
Reported change, 2026-03-31 to 2026-06-30
| Quarter ended | Filed through | Reporting managers | Reported shares | Value as filed |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-29 | 1,241 | 187,596,496 | $59,043,412,914 |
| 2026-06-30 | 2026-08-31 | 1,258 | 192,889,552 | $61,622,858,654 |
Every change figure on this page is a reported quarter-over-quarter change between filing snapshots. It is not real-time trading activity.
AON reported totals over time
Quarter ended 2026-06-30: 1,258 reporting managers · 192,889,552 reported shares · $61,622,858,654 value as filed.
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Quarter-end 13F filed data, long positions only; filings arrive up to 45 days after quarter end.
CUSIPs behind the AON total
The validated bridge mapped 1 current CUSIP(s) to AON for this quarter: G0403H108. Option pseudo-CUSIPs, units, warrants, and preferred classes are excluded from these common-share totals. Mapping coverage in this publication set: 4562 of 6046 universe tickers have at least one validated CUSIP mapping (75.5%). Latest-quarter filed value resolved to any listed ticker: 77.3%; resolved to this universe: 77.2%.
What this page is and is not
Form 13F reports are quarterly holdings snapshots. Managers file up to about 45 days after quarter-end, so these figures describe reported positions as of the quarter-end date, not holdings today. 13F lists reportable long positions from managers above the SEC reporting threshold and omits short positions entirely.
This page is informational only. It is not investment advice, a recommendation, or a signal to buy or sell. Source: SEC Form 13F bulk data set for filings through 2026-08-31 (period ended 2026-06-30), joined to tickers through StockEyes' validated CUSIP bridge. Methodology and coverage are documented on the institutional ownership hub.
Insider transactions for AON (officer and director buys and sells) are covered by InsiderTrace: insidertrace.com/stock/aon. StockEyes does not duplicate insider transaction tables.
Related StockEyes pages
Latest headlines tagged AON are on the market news wire. Upcoming earnings and market dates are on the events calendar. The term itself is defined in the institutional investor glossary entry, and the research workflow behind pages like this one is walked through in how to research a stock and how to compare SEC filings.