Castleark Management’s Boston Scientific BSX Stock Holding History

Castleark Management’s Portfolio BSX Stock Details BSX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q4	–	Sell	-2,350	Closed	-$229K	–	301
2025 Q3	$229K	Buy	+2,350	New	+$243K	0.01%	259
2025 Q2	–	Sell	-64,870	Closed	-$6.54M	–	284
2025 Q1	$6.54M	Buy	+64,870	New	+$6.53M	0.23%	83
2020 Q2	–	Sell	-608,720	Closed	-$19.9M	–	349
2020 Q1	$19.9M	Sell	608,720 -64,460	-10%	-$2.52M	1.18%	22
2019 Q4	$30.4M	Buy	673,180 +349,830	+108%	+$14.6M	1.22%	16
2019 Q3	$13.2M	Buy	+323,350	New	+$13.7M	0.54%	43

Other funds holding BSX

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

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

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

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

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

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

Castleark Management's BSX Position: Q4 2025 in Review

Castleark Management sold out of Boston Scientific (BSX) in Q4 2025, closing a stake of 2,350 shares — an estimated $229K sold.

Castleark Management first reported a position in BSX in Q3 2019 and held it in 5 quarters. The position peaked at $30.4M in Q4 2019. 1,793 funds tracked by Wall St. Rank hold BSX as of Q4 2025.

Castleark Management reported no remaining Boston Scientific position as of Q4 2025 after selling out during the quarter.
Castleark Management sold 2,350 Boston Scientific shares in Q4 2025, an estimated $229K.
Castleark Management first reported a position in Boston Scientific in Q3 2019 and held it in 5 quarters.
Castleark Management's Boston Scientific position peaked at $30.4M in Q4 2019.
1,793 funds tracked by Wall St. Rank held Boston Scientific as of Q4 2025.

Based on Castleark Management's 13F filing for Q4 2025, filed 13 Feb 2026.