William Blair Investment Management
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William Blair Investment Management’s Aon AON Stock Holding History

William Blair Investment 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
2023
Q4 		– Sell
-17,201
Closed -$5.58M – 408
2023
Q3 		$5.58M Sell
17,201
-1,168
-6% -$386K 0.02% 329
2023
Q2 		$6.34M Sell
18,369
-373
-2% -$121K 0.02% 332
2023
Q1 		$5.91M Sell
18,742
-416
-2% -$129K 0.02% 326
2022
Q4 		$5.75M Sell
19,158
-4,455
-19% -$1.3M 0.02% 327
2022
Q3 		$6.33M Buy
23,613
+538
+2% +$152K 0.03% 316
2022
Q2 		$6.22M Sell
23,075
-1,333
-5% -$383K 0.02% 324
2022
Q1 		$7.95M Sell
24,408
-5,656
-19% -$1.65M 0.02% 330
2021
Q4 		$9.04M Sell
30,064
-15,241
-34% -$4.57M 0.02% 341
2021
Q3 		$12.9M Sell
45,305
-6,274
-12% -$1.69M 0.04% 342
2021
Q2 		$12.3M Buy
51,579
+2,351
+5% +$575K 0.04% 262
2021
Q1 		$11.3M Sell
49,228
-1,495
-3% -$329K 0.04% 272
2020
Q4 		$10.7M Buy
50,723
+3,980
+9% +$813K 0.04% 294
2020
Q3 		$9.64M Sell
46,743
-182,603
-80% -$36.5M 0.04% 274
2020
Q2 		$44.2M Buy
+229,346
New +$42.7M 0.18% 131
2020
Q1 		– Sell
-142,999
Closed -$29.8M – 340
2019
Q4 		$29.8M Buy
142,999
+27,054
+23% +$5.36M 0.12% 156
2019
Q3 		$22.4M Sell
115,945
-4,019
-3% -$776K 0.1% 179
2019
Q2 		$23.2M Buy
+119,964
New +$21.7M 0.1% 177

Other funds holding AON

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return
Mawer Investment Management
Mawer Investment Management Calgary, Alberta, Canada $15.4B AUM 10.9% 1-Year Est. Return
WCM Investment Management
WCM Investment Management Laguna Beach, California $43.8B AUM 42.28% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

William Blair Investment Management's AON Position: Q4 2023 in Review

William Blair Investment Management sold out of Aon (AON) in Q4 2023, closing a stake of 17,201 shares — an estimated $5.58M sold.

William Blair Investment Management first reported a position in AON in Q2 2019 and held it in 17 quarters. The position peaked at $44.2M in Q2 2020. 1,059 funds tracked by Wall St. Rank hold AON as of Q4 2023.

  • William Blair Investment Management reported no remaining Aon position as of Q4 2023 after selling out during the quarter.
  • William Blair Investment Management sold 17,201 Aon shares in Q4 2023, an estimated $5.58M.
  • William Blair Investment Management first reported a position in Aon in Q2 2019 and held it in 17 quarters.
  • William Blair Investment Management's Aon position peaked at $44.2M in Q2 2020.
  • 1,059 funds tracked by Wall St. Rank held Aon as of Q4 2023.

Based on William Blair Investment Management's 13F filing for Q4 2023, filed 9 Feb 2024.