Aon plc
US ˙ NYSE ˙ IE00BLP1HW54

SecurityAON / Aon plc
InstitutionSei Investments Co
Latest Disclosed Ownership461,800 shares
Latest Disclosed Value $ 162,959,252
Sei Investments Co reports 24.42% increase in ownership of AON / Aon plc

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 461,800 shares of Aon plc (US:AON) valued at $162,959,984 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 371,158 shares of Aon plc. This represents a change in shares of 24.42% during the quarter. The current value of the position is $145,744,080 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-02-13 2025-12-31 13F AON SHS CL A G0403H108 461,800 90,642 24.42 162,959 23.13 0.1609
2025-11-13 2025-09-30 13F AON SHS CL A G0403H108 371,158 -33,811 -8.35 132,350 -8.39 0.1423
2025-08-14 2025-06-30 13F AON SHS CL A G0403H108 404,969 -14,132 -3.37 144,477 -13.62 0.1675
2025-05-14 2025-03-31 13F/A-1 AON SHS CL A G0403H108 419,101 118,419 39.38 167,262 54.88 0.2153
2025-05-13 2025-03-31 13F AON SHS CL A G0403H108 301,618 936 108,877 0.1184
2025-02-11 2024-12-31 13F AON SHS CL A G0403H108 300,682 61,869 25.91 107,995 30.70 0.1387
2024-11-12 2024-09-30 13F AON SHS CL A G0403H108 238,813 3,550 1.51 82,628 19.63 0.1073
2024-08-13 2024-06-30 13F AON SHS CL A G0403H108 235,263 8,647 3.82 69,068 -8.67 0.0979
2024-05-07 2024-03-31 13F AON SHS CL A G0403H108 226,616 -40,672 -15.22 75,624 -2.78 0.1108
2024-02-14 2023-12-31 13F AON SHS CL A G0403H108 267,288 -25,928 -8.84 77,784 -18.18 0.1249
2023-11-14 2023-09-30 13F AON SHS CL A G0403H108 293,216 65,401 28.71 95,065 20.88 0.1708
2023-08-11 2023-06-30 13F AON SHS CL A G0403H108 227,815 -33,249 -12.74 78,644 -4.46 0.1372
2023-05-12 2023-03-31 13F AON SHS CL A G0403H108 261,064 58,245 28.72 82,312 35.22 0.1529
2023-02-10 2022-12-31 13F AON SHS CL A G0403H108 202,819 -30,375 -13.03 60,873 -2.55 0.1353
2022-11-14 2022-09-30 13F AON SHS CL A G0403H108 233,194 18,662 8.70 62,467 7.82 0.1393
2022-08-15 2022-06-30 13F AON SHS CL A G0403H108 214,532 52,211 32.17 57,938 9.53 0.1251
2022-05-13 2022-03-31 13F AON SHS CL A G0403H108 162,321 11,269 7.46 52,896 16.36 0.1063
2022-02-14 2021-12-31 13F AON SHS CL A G0403H108 151,052 9,269 6.54 45,459 12.05 0.0853
2021-11-12 2021-09-30 13F AON SHS CL A G0403H108 141,783 6,311 4.66 40,570 25.48 0.0851
2021-08-06 2021-06-30 13F AON SHS CL A G0403H108 135,472 -49,852 -26.90 32,332 -24.01 0.0717
2021-05-12 2021-03-31 13F AON SHS CL A G0403H108 185,324 -102,005 -35.50 42,545 -29.89 0.1072
2021-02-08 2020-12-31 13F AON SHS CL A G0403H108 287,329 -36,495 -11.27 60,681 -9.13 0.1569
2020-12-04 2020-09-30 13F/A-1 AON SHS CL A G0403H108 323,824 -6,294 -1.91 66,776 4.99 0.1934
2020-11-06 2020-09-30 13F AON SHS CL A G0403H108 327,393 -2,725 67,512 162,553.8855
2020-08-17 2020-06-30 13F/A-1 AON SHS CL A G0403H108 330,118 -22,386 -6.35 63,602 9.45 0.1974
2020-08-11 2020-06-30 13F AON SHS CL A G0403H108 10,445 -342,059 2,033 5,514.6207
2020-05-14 2020-03-31 13F AON SHS CL A G0408V102 352,504 34,432 10.83 58,109 -12.24 0.2134
2020-02-06 2019-12-31 13F AON SHS CL A G0408V102 318,072 8,239 2.66 66,211 10.37 0.1975
2019-11-12 2019-09-30 13F AON SHS CL A G0408V102 309,833 -11,918 -3.70 59,989 -3.41 0.1535
2019-08-14 2019-06-30 13F AON SHS CL A G0408V102 321,751 -14,931 -4.43 62,110 8.07 0.2029
2019-05-15 2019-03-31 13F AON S3 CL A G0408V102 336,682 30,879 10.10 57,473 22.74 0.1930
2019-02-13 2018-12-31 13F AON SHS CL A G0408V102 305,803 3,687 1.22 46,825 0.79 0.1667
2018-11-08 2018-09-30 13F AON SHS CL A G0408V102 302,116 25,491 9.22 46,460 22.44 0.1684
2018-08-03 2018-06-30 13F AON SHS CL A G0408V102 276,625 -612 -0.22 37,945 -2.46 0.1290
2018-05-11 2018-03-31 13F AON SHS CL A G0408V102 277,237 12,957 4.90 38,901 9.85 0.1491
2018-02-08 2017-12-31 13F AON SHS CL A G0408V102 264,280 -164,327 -38.34 35,413 -43.45 0.1230
2017-11-06 2017-09-30 13F AON SHS CL A G0408V102 428,607 22,777 5.61 62,620 16.06 0.2226
2017-07-31 2017-06-30 13F AON SHS CL A G0408V102 405,830 88,224 27.78 53,955 43.13 0.2151
2017-05-05 2017-03-31 13F AON SHS CL A G0408V102 317,606 10,870 3.54 37,697 10.19 0.1652
2017-02-02 2016-12-31 13F AON SHS CL A G0408V102 306,736 -30,880 -9.15 34,210 -9.92 0.1657
2016-11-04 2016-09-30 13F AON SHS CL A G0408V102 337,616 -32,118 -8.69 37,978 -5.96 0.1929
2016-08-11 2016-06-30 13F AON SHS CL A G0408V102 369,734 27,300 7.97 40,386 12.91 0.2422
2016-05-10 2016-03-31 13F/A-1 AON SHS CL A G0408V102 342,434 -83,870 -19.67 35,767 -9.01 0.2226
2016-02-03 2015-12-31 13F AON SHS CL A G0408V102 426,304 375,515 739.36 39,310 773.56 0.2396
2015-11-02 2015-09-30 13F/A-1 AON SHS CL A G0408V102 50,789 -9,000 -15.05 4,500 -24.50 0.0413
2015-10-30 2015-09-30 13F AON SHS CL A G0408V102 50,789 4,502
2015-08-07 2015-06-30 13F/A-1 AON SHS CL A G0408V102 59,789 -38,175 -38.97 5,960 -36.69 0.0539
2015-08-04 2015-06-30 13F AON SHS CL A G0408V102 59,789 -38,175 5,960 0.0539
2015-05-14 2015-03-31 13F/A-1 AON SHS CL A G0408V102 97,964 -10,438 -9.63 9,414 -8.44 0.0818
2015-05-01 2015-03-31 13F AON SHS CL A G0408V102 97,964 9,414
2015-02-10 2014-12-31 13F AON SHS CL A G0408V102 108,402 108,402 10,282 0.0909
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.