William Blair Investment Management
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William Blair Investment Management’s Arch Capital ACGL Stock Holding History

William Blair Investment Management’s Portfolio ACGL Stock Details ACGL Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$717K Buy
7,384
+21
+0.3% +$1.98K ﹤0.01% 361
2026
Q1 		$707K Sell
7,363
-581,482
-99% -$55.7M ﹤0.01% 367
2025
Q4 		$56.5M Sell
588,845
-100,300
-15% -$9.18M 0.16% 134
2025
Q3 		$62.5M Sell
689,145
-63,179
-8% -$5.67M 0.16% 132
2025
Q2 		$68.5M Buy
752,324
+28,175
+4% +$2.6M 0.18% 124
2025
Q1 		$69.6M Buy
724,149
+100,094
+16% +$9.24M 0.2% 125
2024
Q4 		$57.6M Buy
624,055
+157,197
+34% +$15.9M 0.14% 139
2024
Q3 		$52.2M Buy
466,858
+464,741
+21,953% +$48.3M 0.13% 133
2024
Q2 		$214K Buy
+2,117
New +$206K ﹤0.01% 404
2023
Q4 		– Sell
-6,508
Closed -$519K – 407
2023
Q3 		$519K Buy
6,508
+2,348
+56% +$183K ﹤0.01% 357
2023
Q2 		$311K Sell
4,160
-9
-0.2% -$651 ﹤0.01% 365
2023
Q1 		$283K Sell
4,169
-859
-17% -$56.4K ﹤0.01% 370
2022
Q4 		$316K Sell
5,028
-399
-7% -$22.3K ﹤0.01% 367
2022
Q3 		$247K Sell
5,427
-1,307
-19% -$59K ﹤0.01% 366
2022
Q2 		$306K Sell
6,734
-5,277
-44% -$245K ﹤0.01% 365
2022
Q1 		$582K Buy
12,011
+649
+6% +$30.2K ﹤0.01% 384
2021
Q4 		$505K Buy
11,362
+1,521
+15% +$64.5K ﹤0.01% 384
2021
Q3 		$376K Buy
+9,841
New +$390K ﹤0.01% 409
2017
Q2 		– Sell
-34,368
Closed -$1.09M – 449
2017
Q1 		$1.09M Sell
34,368
-321
-0.9% -$9.81K ﹤0.01% 392
2016
Q4 		$998K Sell
34,689
-3,921
-10% -$107K ﹤0.01% 394
2016
Q3 		$1.02M Buy
38,610
+99
+0.3% +$2.52K ﹤0.01% 396
2016
Q2 		$924K Buy
38,511
+5,430
+16% +$128K ﹤0.01% 401
2016
Q1 		$784K Sell
33,081
-5,055
-13% -$115K ﹤0.01% 406
2015
Q4 		$887K Sell
38,136
-31,329
-45% -$770K ﹤0.01% 401
2015
Q3 		$1.7M Buy
+69,465
New +$1.63M ﹤0.01% 902

Other funds holding ACGL

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
BAMCO Inc
BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
WCM Investment Management
WCM Investment Management Laguna Beach, California $55.2B AUM 57.07% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

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

William Blair Investment Management increased its Arch Capital (ACGL) stake by 0.29% in Q2 2026, buying an estimated $1.98K and bringing the position to 7,384 shares worth $717K. The position accounts for ﹤0.01% of the portfolio, ranked #361.

William Blair Investment Management first reported a position in ACGL in Q3 2015 and has held it in 25 quarters since. The position peaked at $69.6M in Q1 2025. 906 funds tracked by Wall St. Rank hold ACGL as of Q2 2026.

  • William Blair Investment Management held 7,384 shares of Arch Capital worth $717K as of Q2 2026.
  • William Blair Investment Management bought 21 Arch Capital shares in Q2 2026, an estimated $1.98K.
  • Arch Capital made up ﹤0.01% of William Blair Investment Management's portfolio in Q2 2026, its #361 holding.
  • William Blair Investment Management first reported a position in Arch Capital in Q3 2015 and has held it in 25 quarters since.
  • William Blair Investment Management's Arch Capital position peaked at $69.6M in Q1 2025.
  • 906 funds tracked by Wall St. Rank held Arch Capital as of Q2 2026.

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