Diamond Hill Capital Management
AON icon

Diamond Hill Capital Management’s Aon AON Stock Holding History

Diamond Hill 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 		$370M Sell
1,114,156
-373,731
-25% -$121M 2.96% 5
2026
Q1 		$480M Sell
1,487,887
-108,428
-7% -$36M 3% 4
2025
Q4 		$563M Buy
1,596,315
+32,494
+2% +$11.3M 2.89% 6
2025
Q3 		$558M Sell
1,563,821
-10,690
-0.7% -$3.87M 2.65% 7
2025
Q2 		$562M Buy
1,574,511
+361,912
+30% +$131M 2.58% 6
2025
Q1 		$484M Sell
1,212,599
-35,137
-3% -$13.5M 2.22% 10
2024
Q4 		$448M Buy
1,247,736
+275,525
+28% +$101M 1.98% 15
2024
Q3 		$336M Buy
+972,211
New +$318M 1.36% 34

Other funds holding AON

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $609B AUM 40.19% 1-Year Est. Return
Mitsubishi UFJ Asset Management
Mitsubishi UFJ Asset Management Tokyo, Japan $180B AUM 37.51% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
VAM
Veritas Asset Management London, United Kingdom $5.56B AUM 3.46% 1-Year Est. Return
Mawer Investment Management
Mawer Investment Management Calgary, Alberta, Canada $14.7B AUM 12.5% 1-Year Est. Return
CGI
Comgest Global Investors Paris, France $4.55B AUM 11.62% 1-Year Est. Return
PAM
PineStone Asset Management Montreal, Quebec, Canada $16.2B AUM 25.74% 1-Year Est. Return

Diamond Hill Capital Management's AON Position: Q2 2026 in Review

Diamond Hill Capital Management reduced its Aon (AON) stake by 25% in Q2 2026, selling an estimated $121M and leaving 1,114,156 shares worth $370M. The position accounts for 2.96% of the portfolio, ranked #5.

Diamond Hill Capital Management first reported a position in AON in Q3 2024 and has held it in 8 quarters since. The position peaked at $563M in Q4 2025. 715 funds tracked by Wall St. Rank hold AON as of Q2 2026.

  • Diamond Hill Capital Management held 1,114,156 shares of Aon worth $370M as of Q2 2026.
  • Diamond Hill Capital Management sold 373,731 Aon shares in Q2 2026, an estimated $121M.
  • Aon made up 2.96% of Diamond Hill Capital Management's portfolio in Q2 2026, its #5 holding.
  • Diamond Hill Capital Management first reported a position in Aon in Q3 2024 and has held it in 8 quarters since.
  • Diamond Hill Capital Management's Aon position peaked at $563M in Q4 2025.
  • 715 funds tracked by Wall St. Rank held Aon as of Q2 2026.

Based on Diamond Hill Capital Management's 13F filing for Q2 2026, filed 6 Aug 2026.