Castleark Management’s Penumbra PEN Stock Holding History

Castleark Management’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 Q1	–	Sell	-2,686	Closed	-$835K	–	329
2025 Q4	$835K	Buy	2,686 +960	+56%	+$265K	0.02%	236
2025 Q3	$437K	Sell	1,726 -22,865	-93%	-$5.77M	0.01%	245
2025 Q2	$6.31M	Buy	24,591 +9,346	+61%	+$2.54M	0.19%	102
2025 Q1	$4.08M	Buy	+15,245	New	+$4.12M	0.14%	141
2023 Q4	–	Sell	-4,718	Closed	-$1.14M	–	303
2023 Q3	$1.14M	Sell	4,718 -16,412	-78%	-$4.56M	0.06%	184
2023 Q2	$7.27M	Sell	21,130 -4,100	-16%	-$1.26M	0.33%	59
2023 Q1	$7.03M	Hold	25,230	–	–	0.35%	55
2022 Q4	$5.61M	Buy	+25,230	New	+$4.93M	0.29%	83
2020 Q2	–	Sell	-25,792	Closed	-$4.16M	–	372
2020 Q1	$4.16M	Buy	+25,792	New	+$4.35M	0.25%	116
2018 Q3	–	Sell	-25,890	Closed	-$3.58M	–	401
2018 Q2	$3.58M	Buy	+25,890	New	+$3.69M	0.11%	215
2016 Q4	–	Sell	-67,335	Closed	-$5.12M	–	410
2016 Q3	$5.12M	Buy	+67,335	New	+$4.65M	0.15%	176

Other funds holding PEN

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

HBK Investments Dallas, Texas $10.2B AUM 67.73% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

Baillie Gifford & Co Edinburgh, United Kingdom $110B AUM 4.8% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Balyasny Asset Management Chicago, Illinois $80.2B AUM 51.53% 1-Year Est. Return

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

Castleark Management's PEN Position: Q1 2026 in Review

Castleark Management sold out of Penumbra (PEN) in Q1 2026, closing a stake of 2,686 shares — an estimated $835K sold.

Castleark Management first reported a position in PEN in Q3 2016 and held it in 11 quarters. The position peaked at $7.27M in Q2 2023. 485 funds tracked by Wall St. Rank hold PEN as of Q1 2026.

Castleark Management reported no remaining Penumbra position as of Q1 2026 after selling out during the quarter.
Castleark Management sold 2,686 Penumbra shares in Q1 2026, an estimated $835K.
Castleark Management first reported a position in Penumbra in Q3 2016 and held it in 11 quarters.
Castleark Management's Penumbra position peaked at $7.27M in Q2 2023.
485 funds tracked by Wall St. Rank held Penumbra as of Q1 2026.

Based on Castleark Management's 13F filing for Q1 2026, filed 15 May 2026.