Aon plc
DE ˙ DB ˙ IE00BLP1HW54
272,30 € ↓ -1,70 (-0,62%)
2026-06-03
DEL PRIS
SecurityDE:4VK / Aon plc
InstitutionMorgan Stanley
Latest Disclosed Ownership6,374,945 shares
Latest Disclosed Value $ 2,057,706,214
Morgan Stanley reports 14.44% increase in ownership of 4VK / Aon plc

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 6,374,945 shares of Aon plc (DE:4VK) valued at $1,785,622,095 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 5,570,506 shares of Aon plc. This represents a change in shares of 14.44% during the quarter. The current value of the position is $1,735,897,524 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F AON SHS CL A G0403H108 6,374,945 804,439 14.44 2,057,706 4.68 0.1240
2026-05-27 2025-12-31 13F/A-1 AON SHS CL A G0403H108 5,570,506 -565,880 -9.22 1,965,721 -10.16 0.1174
2026-02-13 2025-12-31 13F AON SHS CL A G0403H108 5,570,506 -565,880 1,965,721 0.1174
2026-05-27 2025-09-30 13F/A-1 AON SHS CL A G0403H108 6,136,386 -3,331,026 -35.18 2,188,114 -35.22 0.1325
2025-11-14 2025-09-30 13F AON SHS CL A G0403H108 6,136,386 -3,331,026 2,188,114 0.1325
2025-08-15 2025-06-30 13F AON SHS CL A G0403H108 9,467,412 741,108 8.49 3,377,595 -3.01 0.2200
2025-05-15 2025-03-31 13F AON SHS CL A G0403H108 8,726,304 342,023 4.08 3,482,582 15.65 0.2490
2025-05-15 2024-12-31 13F/A-1 AON SHS CL A G0403H108 8,384,281 262,244 3.23 3,011,299 7.16 0.2110
2025-02-14 2024-12-31 13F AON SHS CL A G0403H108 8,384,281 262,244 3,011,299 0.2110
2025-05-14 2024-09-30 13F/A-2 AON SHS CL A G0403H108 8,122,037 -83,238 -1.01 2,810,144 16.66 0.2038
2025-02-14 2024-09-30 13F/A-1 AON SHS CL A G0403H108 8,122,037 -83,238 2,810,144 0.2037
2024-11-14 2024-09-30 13F AON SHS CL A G0403H108 8,122,037 -83,238 2,810,144 0.2037
2025-05-14 2024-06-30 13F/A-2 AON SHS CL A G0403H108 8,205,275 990,904 13.74 2,408,906 0.05 0.1864
2024-10-17 2024-06-30 13F/A-1 AON SHS CL A G0403H108 8,205,275 990,904 2,408,906 0.1864
2024-08-14 2024-06-30 13F AON SHS CL A G0403H108 8,205,275 990,904 2,408,906 0.1864
2024-10-17 2024-03-31 13F/A-2 AON SHS CL A G0403H108 7,214,371 1,024,267 16.55 2,407,581 33.65 0.1932
2024-08-16 2024-03-31 13F/A-1 AON SHS CL A G0403H108 7,214,371 1,024,267 2,407,581 0.1932
2024-05-15 2024-03-31 13F AON SHS CL A G0403H108 7,214,371 1,024,267 2,407,581 0.1932
2024-08-16 2023-12-31 13F/A-1 AON SHS CL A G0403H108 6,190,104 430,174 7.47 1,801,446 -3.54 0.1587
2024-02-13 2023-12-31 13F AON SHS CL A G0403H108 6,190,104 430,174 1,801,446 0.1587
2023-11-15 2023-09-30 13F AON SHS CL A G0403H108 5,759,930 -83,472 -1.43 1,867,486 -7.42 0.1899
2023-08-14 2023-06-30 13F AON SHS CL A G0403H108 5,843,402 263,405 4.72 2,017,144 14.65 0.1988
2023-05-15 2023-03-31 13F AON SHS CL A G0403H108 5,579,997 3,356,519 150.96 1,759,318 163.63 0.1886
2023-02-14 2022-12-31 13F AON SHS CL A G0403H108 2,223,478 620,067 38.67 667,355 55.38 0.0758
2022-11-14 2022-09-30 13F AON SHS CL A G0403H108 1,603,411 50,664 3.26 429,507 2.57 0.0585
2022-10-27 2022-06-30 13F/A-1 AON SHS CL A G0403H108 1,552,747 735,484 89.99 418,744 57.35 0.0544
2022-08-15 2022-06-30 13F AON SHS CL A G0403H108 1,552,747 735,484 418,744 0.0110
2022-10-27 2022-03-31 13F/A-1 AON SHS CL A G0403H108 817,263 -150,066 -15.51 266,125 -8.47 0.0359
2022-05-13 2022-03-31 13F AON SHS CL A G0403H108 817,263 -150,066 266,125 0.0359
2022-02-14 2021-12-31 13F AON SHS CL A G0403H108 967,329 207,305 27.28 290,741 33.86 0.0359
2021-11-15 2021-09-30 13F AON SHS CL A G0403H108 760,024 -112,505 -12.89 217,193 4.26 0.0293
2021-08-23 2021-06-30 13F/A-1 AON SHS CL A G0403H108 872,529 293,745 50.75 208,325 56.42 0.0275
2021-08-16 2021-06-30 13F AON SHS CL A G0403H108 872,529 293,745 208,325 0.0057
2021-05-17 2021-03-31 13F AON SHS CL A G0403H108 578,784 -138,103 -19.26 133,185 -12.06 0.0196
2021-02-16 2020-12-31 13F AON SHS CL A G0403H108 716,887 114,585 19.02 151,457 21.89 0.0234
2020-11-13 2020-09-30 13F AON SHS CL A G0403H108 602,302 89,219 17.39 124,256 25.74 0.0240
2020-08-14 2020-06-30 13F AON SHS CL A G0403H108 513,083 -23,283 -4.34 98,819 11.63 0.0219
2020-05-26 2020-03-31 13F/A-1 AON SHS CL A G0408V102 536,366 -112,673 -17.36 88,522 -34.52 0.0241
2020-05-15 2020-03-31 13F AON SHS CL A G0408V102 536,366 -112,673 88,522 6,800.3350
2020-02-14 2019-12-31 13F AON SHS CL A G0408V102 649,039 -39,191 -5.69 135,189 1.48 0.0314
2019-11-14 2019-09-30 13F AON SHS CL A G0408V102 688,230 91,977 15.43 133,220 15.78 0.0353
2019-08-14 2019-06-30 13F AON SHS CL A G0408V102 596,253 31,242 5.53 115,066 19.30 0.0306
2019-05-15 2019-03-31 13F AON SHS CL A G0408V102 565,011 -373,741 -39.81 96,448 -29.32 0.0273
2019-02-14 2018-12-31 13F AON SHS CL A G0408V102 938,752 128,939 15.92 136,457 9.58 0.0408
2019-04-23 2018-09-30 13F/A-2 AON SHS CL A G0408V102 809,813 -11,684 -1.42 124,530 10.51 0.0312
2018-11-20 2018-09-30 13F/A-1 AON SHS CL A G0408V102 809,813 0 124,530 0.0312
2018-11-14 2018-09-30 13F AON SHS CL A G0408V102 809,813 -11,684 124,530
2019-04-23 2018-06-30 13F/A-1 AON SHS CL A G0408V102 821,497 36,355 4.63 112,685 2.27 0.0304
2018-08-14 2018-06-30 13F AON SHS CL A G0408V102 821,497 36,355 112,685
2019-04-23 2018-03-31 13F/A-1 AON SHS CL A G0408V102 785,142 -200,505 -20.34 110,181 -16.58 0.0306
2018-05-14 2018-03-31 13F AON SHS CL A G0408V102 785,142 -200,505 110,181
2019-04-23 2017-12-31 13F/A-1 AON SHS CL A G0408V102 985,647 444,188 82.04 132,075 66.96 0.0362
2018-02-14 2017-12-31 13F AON SHS CL A G0408V102 985,647 444,188 132,075
2017-11-14 2017-09-30 13F AON SHS CL A G0408V102 541,459 8,338 1.56 79,108 11.61 0.0237
2017-08-11 2017-06-30 13F AON SHS CL A G0408V102 533,121 -57,959 -9.81 70,879 1.03 0.0214
2017-05-22 2017-03-31 13F/A-1 AON SHS CL A G0408V102 591,080 -208,987 -26.12 70,155 -21.38 0.0216
2017-05-12 2017-03-31 13F AON SHS CL A G0408V102 591,080 70,155
2017-02-22 2016-12-31 13F/A-1 AON SHS CL A G0408V102 800,067 510,268 176.08 89,231 173.71 0.0292
2017-02-13 2016-12-31 13F AON SHS CL A G0408V102 800,067 89,231
2016-11-10 2016-09-30 13F AON SHS CL A G0408V102 289,799 -112,587 -27.98 32,600 -25.83 0.0111
2016-08-12 2016-06-30 13F AON SHS CL A G0408V102 402,386 83,909 26.35 43,953 32.13 0.0159
2016-05-12 2016-03-31 13F AON SHS CL A G0408V102 318,477 -7,112 -2.18 33,265 10.79 0.0128
2016-02-09 2015-12-31 13F AON SHS CL A G0408V102 325,589 -137,608 -29.71 30,024 -26.85 0.0109
2016-02-08 2015-09-30 13F/A-1 AON SHS CL A G0408V102 463,197 210,825 83.54 41,044 63.16 0.0152
2015-11-09 2015-09-30 13F AON SHS CL A G0408V102 463,197 41,044
2015-08-12 2015-06-30 13F AON SHS CL A G0408V102 252,372 -350,462 -58.14 25,155 -56.59 0.0087
2015-05-14 2015-03-31 13F AON SHS CL A G0408V102 602,834 -108,707 -15.28 57,945 -14.13 0.0213
2015-02-13 2014-12-31 13F AON SHS CL A G0408V102 711,541 329,511 86.25 67,477 101.47 0.0247
2014-12-16 2014-09-30 13F/A-1 AON SHS CL A G0408V102 382,030 119,100 45.30 33,493 41.39 0.0129
2014-11-14 2014-09-30 13F AON SHS CL A G0408V102 382,030 33,493
2014-08-12 2014-06-30 13F AON SHS CL A G0408V102 262,930 -242,601 -47.99 23,688 -44.40 0.0405
2014-05-13 2014-03-31 13F AON SHS CL A G0408V102 505,531 113,316 28.89 42,605 29.49 0.0178
2014-02-13 2013-12-31 13F AON SHS CL A G0408V102 392,215 254,301 184.39 32,902 220.46 0.0140
2013-11-13 2013-09-30 13F AON PLC COM STK COM G0408V102 137,914 7,629 5.86 10,267 22.46 0.0049
2013-08-08 2013-06-30 13F AON PLC COM STK COM G0408V102 130,285 130,285 8,384 0.0042
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.