William Blair Investment Management
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William Blair Investment Management’s Arthur J. Gallagher & Co AJG Stock Holding History

William Blair Investment Management’s Portfolio AJG Stock Details AJG Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-13,511
Closed -$4.18M – 415
2025
Q3 		$4.18M Sell
13,511
-19,874
-60% -$5.99M 0.01% 338
2025
Q2 		$10.7M Sell
33,385
-38,282
-53% -$12.6M 0.03% 324
2025
Q1 		$24.7M Buy
71,667
+19,043
+36% +$6.02M 0.07% 262
2024
Q4 		$14.9M Buy
+52,624
New +$15.3M 0.04% 329
2021
Q3 		– Sell
-180,462
Closed -$25.3M – 433
2021
Q2 		$25.3M Sell
180,462
-8,710
-5% -$1.23M 0.08% 198
2021
Q1 		$23.6M Sell
189,172
-5,751
-3% -$694K 0.08% 199
2020
Q4 		$24.1M Sell
194,923
-53,435
-22% -$6.09M 0.08% 190
2020
Q3 		$26.2M Sell
248,358
-64,299
-21% -$6.67M 0.1% 166
2020
Q2 		$30.5M Sell
312,657
-16,005
-5% -$1.42M 0.12% 150
2020
Q1 		$26.8M Buy
328,662
+53,607
+19% +$5.13M 0.13% 151
2019
Q4 		$26.2M Sell
275,055
-38,765
-12% -$3.55M 0.1% 169
2019
Q3 		$28.1M Sell
313,820
-48,775
-13% -$4.38M 0.12% 156
2019
Q2 		$31.8M Buy
362,595
+44,831
+14% +$3.74M 0.13% 152
2019
Q1 		$24.8M Sell
317,764
-21,753
-6% -$1.68M 0.1% 172
2018
Q4 		$25M Sell
339,517
-620,480
-65% -$46.3M 0.12% 163
2018
Q3 		$71.5M Buy
959,997
+887,687
+1,228% +$63.6M 0.25% 117
2018
Q2 		$4.72M Sell
72,310
-442
-0.6% -$29.9K 0.02% 366
2018
Q1 		$5M Buy
72,752
+4,711
+7% +$318K 0.02% 357
2017
Q4 		$4.31M Buy
68,041
+11,202
+20% +$716K 0.02% 355
2017
Q3 		$3.5M Buy
56,839
+15,084
+36% +$887K 0.01% 369
2017
Q2 		$2.39M Buy
+41,755
New +$2.36M 0.01% 391

Other funds holding AJG

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 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 $3.37T AUM 44.26% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $935B AUM
Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 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 AJG Position: Q4 2025 in Review

William Blair Investment Management sold out of Arthur J. Gallagher & Co (AJG) in Q4 2025, closing a stake of 13,511 shares — an estimated $4.18M sold.

William Blair Investment Management first reported a position in AJG in Q2 2017 and held it in 21 quarters. The position peaked at $71.5M in Q3 2018. 1,299 funds tracked by Wall St. Rank hold AJG as of Q4 2025.

  • William Blair Investment Management reported no remaining Arthur J. Gallagher & Co position as of Q4 2025 after selling out during the quarter.
  • William Blair Investment Management sold 13,511 Arthur J. Gallagher & Co shares in Q4 2025, an estimated $4.18M.
  • William Blair Investment Management first reported a position in Arthur J. Gallagher & Co in Q2 2017 and held it in 21 quarters.
  • William Blair Investment Management's Arthur J. Gallagher & Co position peaked at $71.5M in Q3 2018.
  • 1,299 funds tracked by Wall St. Rank held Arthur J. Gallagher & Co as of Q4 2025.

Based on William Blair Investment Management's 13F filing for Q4 2025, filed 9 Feb 2026.