William Blair Investment Management
AAMI

William Blair Investment Management’s Acadian Asset Management AAMI Stock Holding History

William Blair Investment Management’s Portfolio AAMI Stock Details AAMI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$14.9M Sell
207,796
-55,941
-21% -$3.9M 0.04% 282
2026
Q1 		$14.4M Buy
263,737
+8,651
+3% +$456K 0.05% 282
2025
Q4 		$12M Sell
255,086
-26,232
-9% -$1.21M 0.03% 306
2025
Q3 		$13.5M Sell
281,318
-430,764
-60% -$19.2M 0.04% 306
2025
Q2 		$25.1M Sell
712,082
-428,343
-38% -$12.5M 0.07% 257
2025
Q1 		$29.5M Sell
1,140,425
-52,549
-4% -$1.32M 0.08% 224
2024
Q4 		$31.4M Buy
1,192,974
+28,937
+2% +$811K 0.08% 243
2024
Q3 		$29.6M Sell
1,164,037
-35,632
-3% -$854K 0.07% 242
2024
Q2 		$26.6M Sell
1,199,669
-2,245
-0.2% -$50.7K 0.07% 254
2024
Q1 		$27.5M Buy
1,201,914
+511
+0% +$11K 0.07% 263
2023
Q4 		$23M Sell
1,201,403
-23,655
-2% -$418K 0.07% 278
2023
Q3 		$23.8M Sell
1,225,058
-97,760
-7% -$2.02M 0.08% 248
2023
Q2 		$27.7M Buy
1,322,818
+24,615
+2% +$548K 0.09% 239
2023
Q1 		$30.6M Buy
1,298,203
+4,333
+0.3% +$102K 0.11% 217
2022
Q4 		$26.6M Sell
1,293,870
-48,930
-4% -$924K 0.1% 225
2022
Q3 		$20M Sell
1,342,800
-24,326
-2% -$437K 0.08% 255
2022
Q2 		$24.6M Buy
+1,367,126
New +$28M 0.09% 243
2019
Q3 		– Sell
-3,672,966
Closed -$41.9M – 390
2019
Q2 		$41.9M Sell
3,672,966
-203,712
-5% -$2.58M 0.18% 130
2019
Q1 		$52.6M Sell
3,876,678
-46,993
-1% -$607K 0.22% 113
2018
Q4 		$41.9M Sell
3,923,671
-54,972
-1% -$661K 0.21% 117
2018
Q3 		$49.3M Buy
3,978,643
+205,471
+5% +$2.7M 0.17% 150
2018
Q2 		$53.8M Sell
3,773,172
-460
-0% -$7.04K 0.2% 144
2018
Q1 		$59.5M Buy
3,773,632
+214,887
+6% +$3.54M 0.23% 125
2017
Q4 		$59.6M Buy
3,558,745
+153,569
+5% +$2.44M 0.23% 129
2017
Q3 		$50.8M Buy
3,405,176
+11,517
+0.3% +$164K 0.18% 143
2017
Q2 		$50.4M Buy
3,393,659
+155,366
+5% +$2.3M 0.18% 140
2017
Q1 		$49M Buy
3,238,293
+281,989
+10% +$4.16M 0.18% 147
2016
Q4 		$42.9M Sell
2,956,304
-649,927
-18% -$9.22M 0.17% 152
2016
Q3 		$50.2M Buy
3,606,231
+69,870
+2% +$947K 0.19% 146
2016
Q2 		$47.2M Buy
3,536,361
+60,316
+2% +$841K 0.19% 143
2016
Q1 		$46.4M Sell
3,476,045
-89,336
-3% -$1.07M 0.18% 141
2015
Q4 		$54.7M Buy
+3,565,381
New +$55M 0.22% 130

Other funds holding AAMI

PC
Paulson & Co New York $2.58B AUM 68.51% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
ECP
Empyrean Capital Partners Los Angeles, California $3.03B AUM 47.81% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
WP
Woodline Partners San Francisco, California $32.4B AUM 58.5% 1-Year Est. Return

William Blair Investment Management's AAMI Position: Q2 2026 in Review

William Blair Investment Management reduced its Acadian Asset Management (AAMI) stake by 21% in Q2 2026, selling an estimated $3.9M and leaving 207,796 shares worth $14.9M. The position accounts for 0.04% of the portfolio, ranked #282.

William Blair Investment Management first reported a position in AAMI in Q4 2015 and has held it in 32 quarters since. The position peaked at $59.6M in Q4 2017. 302 funds tracked by Wall St. Rank hold AAMI as of Q2 2026.

  • William Blair Investment Management held 207,796 shares of Acadian Asset Management worth $14.9M as of Q2 2026.
  • William Blair Investment Management sold 55,941 Acadian Asset Management shares in Q2 2026, an estimated $3.9M.
  • Acadian Asset Management made up 0.04% of William Blair Investment Management's portfolio in Q2 2026, its #282 holding.
  • William Blair Investment Management first reported a position in Acadian Asset Management in Q4 2015 and has held it in 32 quarters since.
  • William Blair Investment Management's Acadian Asset Management position peaked at $59.6M in Q4 2017.
  • 302 funds tracked by Wall St. Rank held Acadian Asset Management as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.