Mattern Capital Management’s Aon AON Stock Holding History

Mattern Capital Management’s Portfolio AON Stock Details AON Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$1.59M	Buy	4,798 +682	+17%	+$220K	0.19%	97
2026 Q1	$1.33M	Buy	4,116 +142	+4%	+$47.2K	0.16%	105
2025 Q4	$1.4M	Buy	3,974 +33	+0.8%	+$11.5K	0.17%	104
2025 Q3	$1.41M	Buy	3,941 +704	+22%	+$255K	0.17%	103
2025 Q2	$1.15M	Buy	3,237 +358	+12%	+$130K	0.14%	105
2025 Q1	$1.15M	Buy	2,879 +155	+6%	+$59.4K	0.15%	89
2024 Q4	$978K	Buy	2,724 +77	+3%	+$28.3K	0.13%	91
2024 Q3	$916K	Buy	2,647 +169	+7%	+$55.3K	0.12%	91
2024 Q2	$727K	Buy	2,478 +337	+16%	+$99.6K	0.1%	98
2024 Q1	$714K	Buy	2,141 +971	+83%	+$301K	0.1%	93
2023 Q4	$340K	Hold	1,170	–	–	0.05%	115
2023 Q3	$379K	Hold	1,170	–	–	0.06%	113
2023 Q2	$404K	Hold	1,170	–	–	0.07%	111
2023 Q1	$369K	Hold	1,170	–	–	0.07%	108
2022 Q4	$351K	Hold	1,170	–	–	0.06%	106
2022 Q3	$313K	Hold	1,170	–	–	0.07%	108
2022 Q2	$316K	Hold	1,170	–	–	0.06%	105
2022 Q1	$381K	Hold	1,170	–	–	0.07%	102
2021 Q4	$352K	Hold	1,170	–	–	0.06%	100
2021 Q3	$334K	Sell	1,170 -193	-14%	-$51.8K	0.07%	99
2021 Q2	$325K	Hold	1,363	–	–	0.06%	98
2021 Q1	$314K	Hold	1,363	–	–	0.07%	98
2020 Q4	$288K	Hold	1,363	–	–	0.07%	96
2020 Q3	$281K	Hold	1,363	–	–	0.07%	95
2020 Q2	$263K	Hold	1,363	–	–	0.08%	94
2020 Q1	$225K	Hold	1,363	–	–	0.08%	99
2019 Q4	$284K	Buy	+1,363	New	+$270K	0.08%	93

Other funds holding AON

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Dodge & Cox San Francisco, California $191B AUM 17.5% 1-Year Est. Return

Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Mattern Capital Management's AON Position: Q2 2026 in Review

Mattern Capital Management increased its Aon (AON) stake by 17% in Q2 2026, buying an estimated $220K and bringing the position to 4,798 shares worth $1.59M. The position accounts for 0.19% of the portfolio, ranked #97.

Mattern Capital Management first reported a position in AON in Q4 2019 and has held it in 27 quarters since. 1,261 funds tracked by Wall St. Rank hold AON as of Q2 2026.

Mattern Capital Management held 4,798 shares of Aon worth $1.59M as of Q2 2026.
Mattern Capital Management bought 682 Aon shares in Q2 2026, an estimated $220K.
Aon made up 0.19% of Mattern Capital Management's portfolio in Q2 2026, its #97 holding.
Mattern Capital Management first reported a position in Aon in Q4 2019 and has held it in 27 quarters since.
1,261 funds tracked by Wall St. Rank held Aon as of Q2 2026.

Based on Mattern Capital Management's 13F filing for Q2 2026, filed 24 Jul 2026.