William Blair Investment Management
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William Blair Investment Management’s Brunswick BC Stock Holding History

William Blair Investment Management’s Portfolio BC Stock Details BC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$412K Buy
4,888
+23
+0.5% +$1.84K ﹤0.01% 382
2026
Q1 		$354K Buy
4,865
+124
+3% +$10K ﹤0.01% 387
2025
Q4 		$352K Sell
4,741
-436
-8% -$29.6K ﹤0.01% 391
2025
Q3 		$327K Sell
5,177
-165
-3% -$10.2K ﹤0.01% 390
2025
Q2 		$295K Sell
5,342
-89
-2% -$4.5K ﹤0.01% 400
2025
Q1 		$292K Sell
5,431
-16
-0.3% -$1K ﹤0.01% 404
2024
Q4 		$352K Buy
5,447
+2,043
+60% +$160K ﹤0.01% 413
2024
Q3 		$285K Sell
3,404
-86
-2% -$6.68K ﹤0.01% 395
2024
Q2 		$254K Hold
3,490
– – ﹤0.01% 397
2024
Q1 		$337K Sell
3,490
-878
-20% -$77.1K ﹤0.01% 381
2023
Q4 		$423K Sell
4,368
-114
-3% -$9.06K ﹤0.01% 371
2023
Q3 		$354K Buy
4,482
+1,618
+56% +$133K ﹤0.01% 379
2023
Q2 		$248K Buy
2,864
+86
+3% +$7.02K ﹤0.01% 380
2023
Q1 		$228K Buy
+2,778
New +$230K ﹤0.01% 381
2022
Q2 		– Sell
-5,086
Closed -$411K – 404
2022
Q1 		$411K Buy
5,086
+266
+6% +$24.5K ﹤0.01% 414
2021
Q4 		$486K Buy
4,820
+357
+8% +$34.9K ﹤0.01% 387
2021
Q3 		$425K Buy
+4,463
New +$444K ﹤0.01% 398
2017
Q3 		– Sell
-574,670
Closed -$36M – 439
2017
Q2 		$36M Sell
574,670
-6,586
-1% -$383K 0.13% 170
2017
Q1 		$35.6M Buy
581,256
+202,427
+53% +$12M 0.13% 168
2016
Q4 		$20.7M Sell
378,829
-541,535
-59% -$26.8M 0.08% 228
2016
Q3 		$44.9M Sell
920,364
-11,674
-1% -$557K 0.17% 158
2016
Q2 		$42.2M Sell
932,038
-1,496,880
-62% -$70.9M 0.17% 151
2016
Q1 		$117M Sell
2,428,918
-1,520,535
-38% -$65.8M 0.46% 81
2015
Q4 		$199M Sell
3,949,453
-7,137
-0.2% -$368K 0.81% 35
2015
Q3 		$189M Buy
+3,956,590
New +$201M 0.39% 70

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Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $110B AUM 4.8% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Harris Associates
Harris Associates Chicago, Illinois $75.4B AUM 14.46% 1-Year Est. Return

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

William Blair Investment Management increased its Brunswick (BC) stake by 0.47% in Q2 2026, buying an estimated $1.84K and bringing the position to 4,888 shares worth $412K. The position accounts for ﹤0.01% of the portfolio, ranked #382.

William Blair Investment Management first reported a position in BC in Q3 2015 and has held it in 25 quarters since. The position peaked at $199M in Q4 2015. 470 funds tracked by Wall St. Rank hold BC as of Q2 2026.

  • William Blair Investment Management held 4,888 shares of Brunswick worth $412K as of Q2 2026.
  • William Blair Investment Management bought 23 Brunswick shares in Q2 2026, an estimated $1.84K.
  • Brunswick made up ﹤0.01% of William Blair Investment Management's portfolio in Q2 2026, its #382 holding.
  • William Blair Investment Management first reported a position in Brunswick in Q3 2015 and has held it in 25 quarters since.
  • William Blair Investment Management's Brunswick position peaked at $199M in Q4 2015.
  • 470 funds tracked by Wall St. Rank held Brunswick as of Q2 2026.

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