Aon plc
DE ˙ DB ˙ IE00BLP1HW54
276,10 € ↑5,50 (2,03%)
2026-06-05
DEL PRIS
SecurityDE:4VK / Aon plc
InstitutionRhumbline Advisers
Latest Disclosed Ownership380,644 shares
Latest Disclosed Value $ 122,864,134
Rhumbline Advisers reports 0.83% decrease in ownership of 4VK / Aon plc

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 380,644 shares of Aon plc (DE:4VK) valued at $106,618,384 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 383,823 shares of Aon plc. This represents a change in shares of -0.83% during the quarter. The current value of the position is $105,095,808 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)
2026-05-12 2026-03-31 13F AON COM G0403H108 380,644 -3,179 -0.83 122,864 -9.29 0.1051
2026-02-13 2025-12-31 13F AON COM G0403H108 383,823 -11,216 -2.84 135,443 -3.85 0.1095
2025-11-06 2025-09-30 13F AON COM G0403H108 395,039 656 0.17 140,863 0.12 0.1131
2025-08-12 2025-06-30 13F AON COM G0403H108 394,383 17,015 4.51 140,700 -6.58 0.1205
2025-05-29 2025-03-31 13F/A-1 AON COM G0403H108 377,368 8,578 2.33 150,604 13.70 0.1409
2025-04-08 2025-03-31 13F AON COM G0403H108 377,368 8,578 150,604 0.1409
2025-05-29 2024-12-31 13F/A-1 AON COM G0403H108 368,790 -6,014 -1.60 132,455 2.14 0.1185
2025-01-30 2024-12-31 13F AON COM G0403H108 368,790 -6,014 132,455 0.1185
2024-11-12 2024-09-30 13F AON COM G0403H108 374,804 -9,755 -2.54 129,678 14.86 0.1170
2024-08-01 2024-06-30 13F AON COM G0403H108 384,559 19,936 5.47 112,899 -7.22 0.1061
2024-05-09 2024-03-31 13F AON COM G0403H108 364,623 -6,615 -1.78 121,682 12.63 0.1169
2024-02-08 2023-12-31 13F AON COM G0403H108 371,238 -6,291 -1.67 108,038 -11.74 0.1132
2023-11-09 2023-09-30 13F AON COM G0403H108 377,529 -5,322 -1.39 122,402 -7.38 0.1421
2023-08-08 2023-06-30 13F AON COM G0403H108 382,851 2,811 0.74 132,160 110,958.82 0.1480
2023-05-11 2023-03-31 13F AON COM G0403H108 380,040 19,164 5.31 120 -99.89 0.1478
2023-02-14 2022-12-31 13F AON COM G0403H108 360,876 6,059 1.71 108,313 13.96 0.1456
2022-11-10 2022-09-30 13F AON COM G0403H108 354,817 8,386 2.42 95,045 1.73 0.1416
2022-08-11 2022-06-30 13F AON COM G0403H108 346,431 3,359 0.98 93,426 -16.37 0.1363
2022-05-12 2022-03-31 13F AON COM G0403H108 343,072 6,076 1.80 111,715 10.29 0.1438
2022-02-10 2021-12-31 13F AON COM G0403H108 336,996 1,527 0.46 101,288 5.65 0.1241
2021-11-12 2021-09-30 13F AON COM G0403H108 335,469 -10,297 -2.98 95,867 16.13 0.1297
2021-08-05 2021-06-30 13F AON COM G0403H108 345,766 -22,280 -6.05 82,555 -2.52 0.1083
2021-05-06 2021-03-31 13F AON COM G0403H108 368,046 -25,893 -6.57 84,691 1.76 0.1151
2021-02-10 2020-12-31 13F AON COM G0403H108 393,939 -54,838 -12.22 83,227 -10.11 0.1149
2020-11-12 2020-09-30 13F AON COM G0403H108 448,777 -13,307 -2.88 92,583 4.03 0.1451
2020-08-13 2020-06-30 13F AON COM G0403H108 462,084 5,876 1.29 88,997 18.20 0.1486
2020-05-06 2020-03-31 13F AON COM G0403H108 456,208 11,835 2.66 75,293 -18.65 0.1578
2020-02-05 2019-12-31 13F AON PLC SHS CL A COM G0408V102 444,373 -3,719 -0.83 92,558 6.71 0.1548
2019-10-23 2019-09-30 13F AON PLC SHS CL A COM G0408V102 448,092 5,749 1.30 86,737 1.61 0.1585
2019-08-14 2019-06-30 13F AON PLC SHS CL A COM G0408V102 442,343 24,690 5.91 85,363 19.74 0.1602
2019-05-01 2019-03-31 13F AON PLC SHS CL A COM G0408V102 417,653 -4,570 -1.08 71,293 16.16 0.1381
2019-01-31 2018-12-31 13F AON PLC SHS CL A COM G0408V102 422,223 2,579 0.61 61,374 -4.90 0.1335
2018-11-07 2018-09-30 13F AON PLC SHS CL A COM G0408V102 419,644 -20,119 -4.57 64,533 6.98 0.1246
2018-08-06 2018-06-30 13F AON PLC SHS CL A COM G0408V102 439,763 -852 -0.19 60,322 -2.44 0.1217
2018-05-02 2018-03-31 13F AON PLC SHS CL A COM G0408V102 440,615 -6,656 -1.49 61,832 3.17 0.1291
2018-02-09 2017-12-31 13F AON PLC SHS CL A COM G0408V102 447,271 -4,388 -0.97 59,934 -9.17 0.1217
2017-11-06 2017-09-30 13F AON PLC SHS CL A COM G0408V102 451,659 -229 -0.05 65,987 9.83 0.1435
2017-08-02 2017-06-30 13F AON PLC SHS CL A COM G0408V102 451,888 8,320 1.88 60,079 14.12 0.1371
2017-05-02 2017-03-31 13F AON PLC SHS CL A COM G0408V102 443,568 5,918 1.35 52,647 7.86 0.1230
2017-01-27 2016-12-31 13F AON PLC SHS CL A COM G0408V102 437,650 20,877 5.01 48,811 4.11 0.1237
2016-11-08 2016-09-30 13F AON PLC SHS CL A COM G0408V102 416,773 10,683 2.63 46,883 5.69 0.1292
2016-08-11 2016-06-30 13F AON PLC SHS CL A COM G0408V102 406,090 -27,388 -6.32 44,357 -2.03 0.1314
2016-05-02 2016-03-31 13F AON COM G0408V102 433,478 4,198 0.98 45,277 14.38 0.1405
2016-02-03 2015-12-31 13F AON COM G0408V102 429,280 -1,333 -0.31 39,584 3.74 0.1274
2015-11-04 2015-09-30 13F AON COM G0408V102 430,613 -1,399 -0.32 38,157 -11.39 0.1298
2015-08-04 2015-06-30 13F AON COM G0408V102 432,012 13,425 3.21 43,063 7.03 0.1373
2015-05-12 2015-03-31 13F AON COM G0408V102 418,587 -26,816 -6.02 40,235 -4.74 0.1161
2015-02-06 2014-12-31 13F AON COM G0408V102 445,403 -7,313 -1.62 42,238 6.42 0.1227
2014-11-12 2014-09-30 13F AON COM G0408V102 452,716 48,254 11.93 39,690 8.92 0.1192
2014-08-06 2014-06-30 13F AON COM G0408V102 404,462 -18,371 -4.34 36,438 2.25 0.1069
2014-05-06 2014-03-31 13F AON COM G0408V102 422,833 -3,073 -0.72 35,636 -0.26 0.1057
2014-02-03 2013-12-31 13F AON COM G0408V102 425,906 -30,782 -6.74 35,729 5.10 0.1054
2013-11-05 2013-09-30 13F AON COM G0408V102 456,688 -110,029 -19.42 33,996 -6.78 0.1053
2013-08-07 2013-06-30 13F AON COM G0408V102 566,717 566,717 36,468 0.1172
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.