William Blair & Company
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William Blair & Company’s Penumbra PEN Stock Holding History

William Blair & Company’s Portfolio PEN Stock Details PEN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$559K Sell
1,769
-37
-2% -$12K ﹤0.01% 1193
2026
Q1 		$593K Sell
1,806
-6,504
-78% -$2.2M ﹤0.01% 1094
2025
Q4 		$2.58M Buy
8,310
+202
+2% +$55.8K 0.01% 681
2025
Q3 		$2.05M Sell
8,108
-2,456
-23% -$619K 0.01% 721
2025
Q2 		$2.71M Buy
10,564
+4,042
+62% +$1.1M 0.01% 643
2025
Q1 		$1.74M Buy
6,522
+2,782
+74% +$753K 0.01% 748
2024
Q4 		$888K Sell
3,740
-5,140
-58% -$1.17M ﹤0.01% 936
2024
Q3 		$1.73M Sell
8,880
-8,776
-50% -$1.66M 0.01% 749
2024
Q2 		$3.18M Buy
17,656
+982
+6% +$196K 0.01% 579
2024
Q1 		$3.72M Buy
16,674
+3,257
+24% +$805K 0.01% 543
2023
Q4 		$3.37M Buy
13,417
+4,119
+44% +$910K 0.01% 551
2023
Q3 		$2.25M Buy
9,298
+20
+0.2% +$5.55K 0.01% 623
2023
Q2 		$3.19M Sell
9,278
-1,008
-10% -$310K 0.01% 550
2023
Q1 		$2.87M Sell
10,286
-2,457
-19% -$627K 0.01% 574
2022
Q4 		$2.83M Buy
12,743
+512
+4% +$100K 0.01% 552
2022
Q3 		$2.32M Buy
12,231
+1,451
+13% +$233K 0.01% 579
2022
Q2 		$1.34M Sell
10,780
-353
-3% -$56K 0.01% 748
2022
Q1 		$2.47M Sell
11,133
-932
-8% -$207K 0.01% 646
2021
Q4 		$3.47M Buy
12,065
+1,973
+20% +$522K 0.01% 578
2021
Q3 		$2.69M Buy
10,092
+213
+2% +$57.3K 0.01% 621
2021
Q2 		$2.71M Sell
9,879
-92
-0.9% -$25.1K 0.01% 608
2021
Q1 		$2.7M Sell
9,971
-2,416
-20% -$624K 0.01% 599
2020
Q4 		$2.17M Buy
12,387
+1,101
+10% +$241K 0.01% 623
2020
Q3 		$2.19M Buy
11,286
+3
+0% +$631 0.01% 563
2020
Q2 		$2.02M Sell
11,283
-80
-0.7% -$13.9K 0.01% 551
2020
Q1 		$1.83M Buy
11,363
+642
+6% +$108K 0.01% 528
2019
Q4 		$1.76M Buy
10,721
+4,717
+79% +$750K 0.01% 638
2019
Q3 		$807K Buy
6,004
+4,480
+294% +$693K ﹤0.01% 814
2019
Q2 		$244K Buy
+1,524
New +$220K ﹤0.01% 1228

Other funds holding PEN

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
HI
HBK Investments Dallas, Texas $10.3B AUM 67.69% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
ECM
ExodusPoint Capital Management New York $15.5B AUM 38.81% 1-Year Est. Return
Balyasny Asset Management
Balyasny Asset Management Chicago, Illinois $80.2B AUM 51.53% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $225B AUM 49.49% 1-Year Est. Return

William Blair & Company's PEN Position: Q2 2026 in Review

William Blair & Company reduced its Penumbra (PEN) stake by 2% in Q2 2026, selling an estimated $12K and leaving 1,769 shares worth $559K. The position accounts for ﹤0.01% of the portfolio, ranked #1193.

William Blair & Company first reported a position in PEN in Q2 2019 and has held it in 29 quarters since. The position peaked at $3.72M in Q1 2024. 451 funds tracked by Wall St. Rank hold PEN as of Q2 2026.

  • William Blair & Company held 1,769 shares of Penumbra worth $559K as of Q2 2026.
  • William Blair & Company sold 37 Penumbra shares in Q2 2026, an estimated $12K.
  • Penumbra made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1193 holding.
  • William Blair & Company first reported a position in Penumbra in Q2 2019 and has held it in 29 quarters since.
  • William Blair & Company's Penumbra position peaked at $3.72M in Q1 2024.
  • 451 funds tracked by Wall St. Rank held Penumbra as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.