AON PLC

Ticker: AON CUSIP: G0403H108 Class: SHS CL A

FRONTIER CAPITAL MANAGEMENT CO LLC's Holding History (CIK: 0000351173)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 58,593 Value ($000) $20,676 Avg Close $349.16 Range $324.28 - $370.31

Q3 2025

Shares 139,453 Value ($000) $49,726 Avg Close $361.49 Range $345.06 - $380.20

Q2 2025

Shares 186,844 Value ($000) $66,658 Avg Close $361.30 Range $322.37 - $399.35

Q1 2025

Shares 178,972 Value ($000) $71,426 Avg Close $381.59 Range $343.99 - $411.24

Q4 2024

Shares 144,037 Value ($000) $51,732 Avg Close $365.26 Range $339.24 - $392.96

Q3 2024

Shares 152,997 Value ($000) $52,935 Avg Close $324.38 Range $288.84 - $350.77

Q2 2024

Shares 120,459 Value ($000) $35,364 Avg Close $292.51 Range $264.78 - $328.92

Q1 2024

Shares 126,135 Value ($000) $42,094 Avg Close $306.03 Range $281.78 - $331.94

Q4 2023

Shares 136,564 Value ($000) $39,743 Avg Close $315.32 Range $280.78 - $332.21

Q3 2023

Shares 254,601 Value ($000) $82,547 Avg Close $325.28 Range $307.94 - $339.08

Q2 2023

Shares 344,016 Value ($000) $118,754 Avg Close $318.69 Range $301.32 - $341.07

Q1 2023

Shares 555,065 Value ($000) $175,006 Avg Close $303.19 Range $275.29 - $321.21

Q4 2022

Shares 514,311 Value ($000) $154,365 Avg Close $285.70 Range $260.07 - $307.82

Q3 2022

Shares 531,628 Value ($000) $142,407 Avg Close $275.86 Range $255.74 - $296.14

Q2 2022

Shares 559,256 Value ($000) $150,820 Avg Close $279.95 Range $239.95 - $332.69

Q1 2022

Shares 407,662 Value ($000) $132,747 Avg Close $282.81 Range $252.06 - $322.12

Q4 2021

Shares 472,185 Value ($000) $141,920 Avg Close $290.95 Range $274.90 - $316.79

Q3 2021

Shares 536,716 Value ($000) $153,377 Avg Close $260.29 Range $215.96 - $293.10

Q2 2021

Shares 521,656 Value ($000) $124,551 Avg Close $236.31 Range $221.03 - $252.51

Q1 2021

Shares 490,774 Value ($000) $112,932 Avg Close $212.41 Range $193.30 - $227.75

Q4 2020

Shares 512,996 Value ($000) $108,381 Avg Close $196.52 Range $172.95 - $208.05

Q3 2020

Shares 510,924 Value ($000) $105,404 Avg Close $191.78 Range $180.89 - $203.83

Q2 2020

Shares 616,340 Value ($000) $118,707 Avg Close $178.56 Range $144.47 - $196.01

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	58,593	$20,676	$349.16	$324.28 - $370.31
Q3 2025	139,453	$49,726	$361.49	$345.06 - $380.20
Q2 2025	186,844	$66,658	$361.30	$322.37 - $399.35
Q1 2025	178,972	$71,426	$381.59	$343.99 - $411.24
Q4 2024	144,037	$51,732	$365.26	$339.24 - $392.96
Q3 2024	152,997	$52,935	$324.38	$288.84 - $350.77
Q2 2024	120,459	$35,364	$292.51	$264.78 - $328.92
Q1 2024	126,135	$42,094	$306.03	$281.78 - $331.94
Q4 2023	136,564	$39,743	$315.32	$280.78 - $332.21
Q3 2023	254,601	$82,547	$325.28	$307.94 - $339.08
Q2 2023	344,016	$118,754	$318.69	$301.32 - $341.07
Q1 2023	555,065	$175,006	$303.19	$275.29 - $321.21
Q4 2022	514,311	$154,365	$285.70	$260.07 - $307.82
Q3 2022	531,628	$142,407	$275.86	$255.74 - $296.14
Q2 2022	559,256	$150,820	$279.95	$239.95 - $332.69
Q1 2022	407,662	$132,747	$282.81	$252.06 - $322.12
Q4 2021	472,185	$141,920	$290.95	$274.90 - $316.79
Q3 2021	536,716	$153,377	$260.29	$215.96 - $293.10
Q2 2021	521,656	$124,551	$236.31	$221.03 - $252.51
Q1 2021	490,774	$112,932	$212.41	$193.30 - $227.75
Q4 2020	512,996	$108,381	$196.52	$172.95 - $208.05
Q3 2020	510,924	$105,404	$191.78	$180.89 - $203.83
Q2 2020	616,340	$118,707	$178.56	$144.47 - $196.01