Aon plc
US ˙ NYSE ˙ IE00BLP1HW54

SecurityAON / Aon plc
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership341,937 shares
Latest Disclosed Value $ 110,370
Natixis Advisors, L.p. reports 2.22% increase in ownership of AON / Aon plc

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 341,937 shares of Aon plc (US:AON) valued at $110,370,425 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 334,511 shares of Aon plc. This represents a change in shares of 2.22% during the quarter. The current value of the position is $107,915,317 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)
2026-05-13 2026-03-31 13F AON PLC SHS COM G0403H108 341,937 7,426 2.22 110 -6.78 0.1535
2026-02-10 2025-12-31 13F AON PLC SHS COM G0403H108 334,511 -21,315 -5.99 118 -6.35 0.1673
2025-11-13 2025-09-30 13F AON COM G0403H108 355,826 101,921 40.14 127 40.00 0.1851
2025-08-13 2025-06-30 13F AON COM G0403H108 253,905 -32,607 -11.38 91 -21.05 0.1437
2025-05-08 2025-03-31 13F AON PLC SHS COM G0403H108 286,512 6,348 2.27 114 14.00 0.2113
2025-02-10 2024-12-31 13F AON PLC SHS COM G0403H108 280,164 -7,287 -2.54 101 1.01 0.1880
2024-11-06 2024-09-30 13F AON PLC SHS COM G0403H108 287,451 -15,281 -5.05 99 12.50 0.1939
2024-08-01 2024-06-30 13F AON PLC SHS COM G0403H108 302,732 -37,813 -11.10 89 -22.12 0.1932
2024-04-25 2024-03-31 13F AON COM G0403H108 340,545 -121,501 -26.30 114 -15.67 0.2613
2024-02-06 2023-12-31 13F AON COM G0403H108 462,046 -46,607 -9.16 134 -18.29 0.3540
2023-11-13 2023-09-30 13F AON COM G0403H108 508,653 27,627 5.74 165 -1.20 0.5043
2023-08-15 2023-06-30 13F AON PLC SHS COM G0403H108 481,026 9,373 1.99 166 12.16 0.5127
2023-05-11 2023-03-31 13F AON COM G0403H108 471,653 15,825 3.47 149 8.82 0.5118
2023-01-27 2022-12-31 13F AON PLC SHS COM G0403H108 455,828 -67,149 -12.84 137 -99.90 0.5172
2022-11-14 2022-09-30 13F AON PLC CL A COM G0403H108 522,977 72,677 16.14 140,089 15.36 0.5926
2022-08-12 2022-06-30 13F AON PLC SHS COM G0403H108 450,300 -6,368 -1.39 121,436 -18.34 0.5340
2022-05-12 2022-03-31 13F AON PLC SHS COM G0403H108 456,668 40,557 9.75 148,705 18.90 0.5671
2022-02-08 2021-12-31 13F AON PLC SHS COM G0403H108 416,111 -6,246 -1.48 125,066 3.62 0.4776
2021-11-15 2021-09-30 13F AON COM G0403H108 422,357 -29,658 -6.56 120,697 11.84 0.4964
2021-08-12 2021-06-30 13F AON COM G0403H108 452,015 39,103 9.47 107,923 13.59 0.5037
2021-05-05 2021-03-31 13F AON COM G0403H108 412,912 9,442 2.34 95,014 11.47 0.4959
2021-02-12 2020-12-31 13F AON COM G0403H108 403,470 49,947 14.13 85,241 16.88 0.4910
2020-11-12 2020-09-30 13F AON COM G0403H108 353,523 147,236 71.37 72,932 83.56 0.4589
2020-08-11 2020-06-30 13F AON PLC SHS COM G0403H108 206,287 -9,739 -4.51 39,731 11.44 0.2637
2020-04-27 2020-03-31 13F AON COM G0408V102 216,026 9,147 4.42 35,653 -17.26 0.2906
2020-02-10 2019-12-31 13F AON COM G0408V102 206,879 -5,626 -2.65 43,091 4.76 0.3039
2019-11-12 2019-09-30 13F AON PLC SHS CL A G0408V102 212,505 5,338 2.58 41,135 2.89 0.3265
2019-08-12 2019-06-30 13F AON COM G0408V102 207,167 7,691 3.86 39,979 17.41 0.3265
2019-05-15 2019-03-31 13F/A-1 AON PLC SHS COM G0408V102 199,476 -1,160 -0.58 34,051 16.76 0.2981
2019-05-15 2019-03-31 13F AON PLC SHS COM G0408V102 199,476 -1,160 34,051
2019-02-13 2018-12-31 13F/A-1 AON PLC SHS CL A G0408V102 200,636 24,881 14.16 29,164 7.91 0.2879
2019-02-13 2018-12-31 13F AON PLC SHS CL A G0408V102 200,636 24,881 29,164
2018-11-13 2018-09-30 13F AON PLC SHS COM G0408V102 175,755 6,437 3.80 27,027 16.37 0.2379
2018-08-14 2018-06-30 13F/A-1 AON PLC SHS CL A COM G0408V102 169,318 9,763 6.12 23,225 3.73 0.2219
2018-08-14 2018-06-30 13F AON PLC SHS CL A COM G0408V102 169,318 23,225
2018-05-10 2018-03-31 13F AON PLC SHS COM G0408V102 159,555 -24,798 -13.45 22,390 -9.36 0.2210
2018-02-14 2017-12-31 13F AON PLC SHS CL A G0408V102 184,353 3,213 1.77 24,703 -6.65 0.2516
2017-11-14 2017-09-30 13F AON COM G0408V102 181,140 -3,981 -2.15 26,463 7.52 0.2796
2017-07-27 2017-06-30 13F AON PLC SHS COM G0408V102 185,121 -10,261 -5.25 24,612 6.13 0.2664
2017-05-12 2017-03-31 13F AON PLC SHS CL A G0408V102 195,382 -10,066 -4.90 23,190 1.20 0.2569
2017-02-07 2016-12-31 13F AON PLC SHS COM G0408V102 205,448 -831 -0.40 22,914 -1.25 0.2755
2016-11-04 2016-09-30 13F AON SHS CL A G0408V102 206,279 23,479 12.84 23,204 16.21 0.3006
2016-08-01 2016-06-30 13F AON PLC SHS CL A G0408V102 182,800 50,066 37.72 19,967 44.02 0.2760
2016-05-06 2016-03-31 13F AON SHS CL A G0408V102 132,734 10,140 8.27 13,864 22.65 0.2075
2016-02-12 2015-12-31 13F AON PLC SHS CL A G0408V102 122,594 1,361 1.12 11,304 5.23 0.1853
2015-11-12 2015-09-30 13F AON PLC SHS COM G0408V102 121,233 26,934 28.56 10,742 14.28 0.1863
2015-08-14 2015-06-30 13F AON PLC SHS COM G0408V102 94,299 5,847 6.61 9,400 10.56 0.1596
2015-05-15 2015-03-31 13F AON SHS CL A G0408V102 88,452 2,536 2.95 8,502 4.36 0.1492
2015-02-05 2014-12-31 13F AON COM G0408V102 85,916 8,868 11.51 8,147 20.61 0.1525
2014-11-03 2014-09-30 13F AON COM G0408V102 77,048 -57,054 -42.55 6,755 -44.09 0.1355
2014-08-13 2014-06-30 13F AON COM G0408V102 134,102 9,091 7.27 12,082 14.67 0.1731
2014-05-13 2014-03-31 13F AON COM G0408V102 125,011 -4,771 -3.68 10,536 -3.23 0.1622
2014-02-12 2013-12-31 13F AON COM G0408V102 129,782 108,714 516.01 10,888 594.39 0.1782
2013-10-30 2013-09-30 13F AON COM G0408V102 21,068 2,234 11.86 1,568 29.37 0.0289
2013-07-19 2013-06-30 13F AON COM G0408V102 18,834 18,834 1,212 0.0241
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.